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Illinois  Institute 

of  Technology 

UNIVERSITY  LIBRARIES 


I  AT  418 
Marx,  W.  L. 

A  study  of  the  effect  of 
temperature  and  pressure  on 


For  Usa  In  Librrry 


*v  ■**»« 


:  :  2  ;  : 


A  STUDY  OF  THE  EFFECT  OF 

TEMPERATURE  AND  PRESSURE 

Oil  THE  CARBONATION  OF  WATER. 

A  THESIS 
PRESENTED  BY 
WALTER  L.  MARX 
TO  THE 
PRESIDENT  AND  FACULTY 
OF 
ARMOUR  INSTITUE  OF  TECHNOLOGY 
FOR  THE  DEGREE  OF 
CHEMICAL  ENGINEER 
-19  16- 


ILLINOIS  INSTITUTE  OF  TECHNOLOC 
PAUL  V.  GALVIN  LIBRARY 

;35  WEST  33RD  STREET 
CHICAGO,  IL  60616 


^2-^^ 


%n^-    . 


Q&M. 


- 


TABLE   OF   CONTENTS 

Page 

Introduction 1 

The  Process  of  Carbonating  and  bottling  water... 3 

Collecting  of  Samples 7 

Pressure  Tests 9 

Air  Content  Analysis 12 

Calculations 16 

Discussion  of  Results 17 

Tabulated  Results 25 

Chemical  Analysis  of  Ifater 39 

Bibliography 40 

Graphic  Representation  of  Results 41 


26424 


A  STUDY  OF  THE  EFFECT  OF 

TEMPERATURE  AND  PRESSURE 

ON  THE  CARBONATION  OF  WATER. 


The  carbonating  industry,  although  not  of  recent 
origin,  is  still  in  its  infancy  as  far  as  technical  know- 
ledge of  the  subject  is  concerned. 

Statistics  show  that  less  than  three  per  cent  of 
the  one  hundred  thousand  bottling  concerns  in  this  country 
employ  technically  trained  men.  Almost  complete  chaos  seems 
to  exist  in  the  minds  of  the  great  majority  of  bottling 
plant  operators  as  far  as  scientific  control  of  their 
process  is  concerned,  and  consequently  a  non-uniform  product 
ranging  from  a  non-palatable  one  to  one  of  passable  quality 
is  thrust  upon  the  public. 

A  great  majority  of  the  bottling  plant  operators — 
either  on  account  of  their  indisposition  to  add  the  extra 
expense  of  a  refrigerating  system,  or  on  account  of  their 
ignorance  of  the  very  important  factor  that  temperature 
plays  in  the  manufacture  of  a  perfectly  carbonated 
product — do  not  take  the  trouble  to  refrigerate  their 
water,  but  simply  carbonate  it  at  whatever  temperature 
they  obtain  it  from  their  supply  line. 


Pressure  alone  will  not  produce  a  perfectly  car- 
bonated product  if  the  temperature  of  the  water  during  the 
impregnation  period  is  above  a  certain  limit. 

It  has  long  been  known  by  bottlers  and  by 
connoisseurs  of  carbonated  water  that  the  palatability  of 
a  carbonated  beverage  increases  with  age, and  that  a  bottle 
of  carbonated  water  will  show  a  finer  degree  of  combination 
between  the  carbon  dioxide  gas  and  the  water  six  months  or 
a  year  after  it  was  carbonated  than  on  the  day  that  it  was 
bottled. 

Bottlers  have  also  realized  for  a  long  time  that 
they  can  obtain  a  finer  degree  of  carbonation  when  bottling 
large  size  bottles,  such  as  quarts,  than  they  can  when 
bottling  small  bottles,  such  as  splits. 

Both  of  the  foregoing  phenomena  have  been 
accepted  as  facts,  and  little  or  no  effort  has  been  made 
to  ascertain  the  real  underlying  cause. 

It  was  with  this  end  in  view  that  the  author 
set  out  to  determine,  from  a  scientific  standpoint,  the 
factors  which  influence  the  degree  of  combination 
between  the  carbon  dioxide  gas  and  the  water. 

The  author  worked  on  the  theory  that  a  maximum 
amount  of  carbonic  acid  (  H2C03  )  present  in  the  water 


-  2  - 


produced  a  carbonated  beverage  of  maximum  quality. 

The  improper  elimination  of  air  from  the  car- 
bonated water  is  to  a  very  great  extent  instrumental  in 
the  manufacture  of  an  imperfect  product.  At  an  ordinary 
temperature  the  pressure  of  air  will  not  alone  prevent 
the  absorption  of  its  own  volume  of  carbon  dioxide  gas, 
but  will  represent  twenty  times  the  volume  of  the  latter, 
due  to  their  relative  solubilities  in  water. 

In  conducting  the  research  work,  in  order  to 
determine  the  effect  of  temperature,  pressure  and  time 
of  storage  on  the  degree  of  carbonation  of  the  carbonated 
product,  the  author  tested  over  twelve  hundred  bottles 
for  bottle  pressure  and  air  content  during  a  period  of 
five  months. 

The  carbon  dioxide  gas  used  was  made  from 
sodium  bicarbonate  and  forty-two  percent  commercial 
sulphuric  acid.  The  gas  was  then  passed  through  two  water 
purifiers  in  order  to  wash  out  any  sulphuric  acid  or 
suspended  material,  and  then  through  a  potassium  perman- 
ganate purifier  in  order  to  remove  hydro-carbons  which  might 
be  present.  From  the  latter  purifier  the  gas  passed  to  a 
gasometer  and  was  then  ready  for  use. 


-  3  - 


The  water  was  pumped  from  the  spring  through 
a  block  tin  pipe  to  a  nine  hundred  gallon  glass  lined 
supply  tank  on  the  second  floor  of  the  plant;  from  this 
tank  the  water  gravitated  through  a  series  of  refrigerat- 
ing coils  to  the  carbonator. 

A  Twitchell  double  pump  carbonator  was  used 
for  impregnating  the  water  with  the  carbon  dioxide  gas. 
A  description  of  this  type  of  machine  may  be  best  given 
by  tracing  the  passage  of  the  water  and  the  gas  from  the 
outlet  of  the  refrigerating  coils  to  the  outlet  of  the 
carbonator. 

In  the  illustration  on  the  opposite  page  the 
refrigerating  coils  have  been  omitted  between  the  gasometer 
and  the  carbonator,  on  account  of  the  lack  of  space. 

The  outside  shell  of  the  gasometer  is  c'omposed 
of  galvanized  sheet  iron  and  is  filled  about  two  thirds 
full  of  water,  which  acts  as  a  seal  for  the  gas.  In  the 
illustration,  part  "8"  shows  the  gasometer  bell  which  is 
made  of  tin  lined  sheet  copper.  This  bell  is  counter- 
weighed by  means  of  the  weight  "4".  As  the  gas  passes 
from  the  generator  through  the  purifiers  into  the  gasometer 
inlet  Ml"  the  bell  "8"  rises.  As  soon  as  the  carbonator 
has  been  put  into  operation,  the  gas  is  pumped  from  the 

-  4  - 


gasometer  through  the  outlet  "3"  and  passes  through  the 
gas  refrigerating  coils  to  the  carbonator  through  the 
connecting  pipes  "h"  and  "f".  The  pipe  line  "f"  conducts 
the  gas  from  the  single  supply  line  "h"  to  both  pumps,  one 
on  either  end  of  the  carbonator. 

The  mechanisms  on  both  ends  of  the  carbonator 
are  identical  in  construction,  and  for  this  reason  an 
explanation  of  one  end  will  suffice  for  an  understanding 
of  the  machine. 

The  water  supply  line  is  not  shown  in  the 
illustration,  but  is  practically  the  same  as  the  gas  supply 
lines  "h"  and  "f".  The  water  enters  the  water  box  at  the 
rear  of  the  carbonator  through  the  inlet  "k".  The  height 
of  the  water  in  this  reservoir  is  regulated  by  means  of 
a  float.  From  the  water  box  the  water  passes  through  the 
connecting  pipe  ML"  to  the  pumps,  the  amount  pumped  being 
determined  by  the  setting  of  the  regulating  valve  "r".  The 
gas  regulating  valve  M17"  is  always  kept  wide  open. 

With  each  stroke  of  the  pump  a  charge  of  water 
and  gas  is  drawn  from  the  supply  lines  and  forced  into  the 
expansion  dome  Mq";  from  here  it  passes  through  the 
connecting  pipes,  through  the  check  valve  "b"  into  the  spray 
chamber  "c" .   In  this  chamber  the  water  is  divided  into 


-  5  - 


a  very  fine  mist  by  forcing  the  charge  through  a  spraying 
apparatus  into  the  carbonating  cylinder  "a".  As  the  water 
falls  into  this  cylinder,  it  is  agitated  by  means  of  an 
agitator  which  revolves  on  the  shaft  "a7M. 

The  pressure  within  the  carbonating  cylinder,  as 
shown  by  the  pressure  gauge  "s",  is  regulated  by  means  of 
the  pressure  regulator  "z" .  Any  excess  gas  which  is 
forced  into  the  carbonating  cylinder  passes  back  through  a 
blow  back  into  the  water  box  and  saturates  the  water  in  the 
water  box  at  atmospheric  pressure.  From  here  the  excess 
gas  passes  through  the  gas  return  pipe,  and  the  gasometer 
inlet  *2*  baok  into  the  gasometer. 

When  bottling  at  one  pressure,  both  pumps  are 
discharged  into  one  carbonating  cylinder  by  adjusting  the 
distributing  valves  of  the  machine.  The  carbonated  water 
is  discharged  from  the  carbonator  through  the  outlet 
cock  "v". 

All  of  the  water  was  filled  on  a  Hes  &   Keller 

counter  pressure  type  of  rotary  filler.  When  using  this 

type  of  filler,  the  water  is  reduced  in  pressure  after 

leaving  the  carbonator, by  means  of  a  pressure  reducing 

valve  before  entering  the  filler,  to  twenty  pounds.  The 

water  chamber  of  the  filler  is  supplied  with  a  floating 

disk,  which  regulates  the  height  of  the  water  within  the 

chamber. 

-  6  - 


As  the  bottles  are  placed  on  the  filling  spouts, 
the  water  is  allowed  to  flow  into  the  "bottles  by  forcing 
each  of  the  twelve  spouts  to  a  downward  position,  thus 
opening  the  water  valves.  When  the  bottles  are  full,  the 
pressure  within  the  bottles  and  the  filling  chamber 
become  equal  and  the  flow  of  the  water  ceases. 

From  the  filling  apparatus  the  bottles  pass  to 
a  crowning  machine,  and  after  being  exposed  to  the  atmos- 
phere for  a  very  brief  interval  they  are  crowned. 

The  crowned  bottles  are  then  put  in  galvanized 
iron  steaming  trays  and  are  passed  through  a  testing  tank. 
This  tank  is  supplied  with  a  conveyor  and  is  kept  full  of 
water  at  a  temperature  of  105  degrees  F.  As  the  crowned 
bottles  pass  through  the  tank,  the  temperature  of  the 
carbonated  product  is  raised  and  the  expanding  of  the 
carbon  dioxide  gas  exerts  a  pressure  of  about  fifty 
pounds  per  square  inch  on  the  crown.  If  the  latter  is 
defective  in  any  way  the  escaping  gas  bubbles  from  the 
bottle  through  the  water  of  the  testing  tank  and  the 
bottle  is  discarded. 

In  collecting  the  samples  for  the  research 
work,  every  possible  precautionwas  observed  which  would 
in  any  way  affect  the  final  results.  The  gas  in  the  gaso- 
meter was  frequently  tested  for  purity  by  means  of  a 

-  7  - 


nitrometer  and  caustic  potash  solution  and  at  no  time  was 
found  to  contain  less  that  99.3  per  cent  of  carbon  dioxide. 
The  gas  was  also  tested  for  sulphur  trioxide  "by  passing  a 
stream  of  the  gas  through  a  hot  solution  of  barium  chloride, 
and  not  even  a  trace  of  sulphur  could  be  detected. 

The  pressure  regulator  on  the  carbonating  cylinder 
was  set  at  30  lbs.  pressure  and  the  carbonated  water  was 
allowed  to  flow  out  until  it  registered  32  degress  F.  The 
bi-pass  valve  on  the  carbonator  was  then  closed,  the  outlet 
to  the  filler  was  opened,  and  the  carbonated  water  was  al- 
lowed to  flow  out  of  the  filler  through  a  bi-pass  valve  until 
the  constant  temperature  of  38  degrees  F.  was  obtained.  A 
series  of  twelve  samples  were  then  collected  at  this  tempera- 
ture and  pressure. 

The  pressure  regulator  was  then  set  at  40  lbs.  and 
the  same  routine  was  followed  as  above  without  changing  the 
temperature. 

By  keeping  a  constant  temperature  of  32  degrees  F. 
and  by  increasing  the  pressure  by  10  lbs.  after  each  set  of 
samples  had  been  collected  until  a  carbonating  pressure  of 
70  lbs.  had  been  reached,  the  whole  series  of  32  degrees  F. 
samples  were  obtained. 


The  pressure  regulator  was  then  set  tack  to  30  lbs.  again, 
the  temperature  of  the  water  was  raised  to  34  degrees  F. ,  and 
a  series  of  samples  were  collected  at  this  temperature. 

The  same  routine  was  then  followed  until  a  series  of 
samples  had  been  collected  for  the  various  pressures  ranging 
from  30  to  70  lbs.  for  the  temperatures  36,  38  and  40  degrees 
?. 

The  foregoing  pressures  were  used  in  collecting  the 
six  and  one  half  ounce  samples  or  splits.   In  collecting 
samples  of  the  twelve  and  twenty-four  ounce  bottles 
the  pressures  used  were  50  lbs.,  45  lbs.,  60  lbs.,  and 
75  lbs.  at  the  same  temperature  intervals  as  above. 

During  the  time  that  the  samples  were  collected, 
the  air — which  was  displaced  from  the  water  by  the  gas 
during  the  process  of  carbonation — was  allowed  to  escape 
from  the  carbonator  through  the  air  exhaust  cap  "d". 

The  sample  bottles  were  then  stored  in  a  room  where 
it  was  hoped  that  the  temperature  would  be  almost  constant 
throughout  the  year;  but  this  condition  was  not  realized, 
as  the  tabulated  forms  of  the  results  will  show. 

At  the  end  of  each  month  four  samples,  representing 
every  condition  of  temperature  and  pressure  under  which  the 
water  was  carbonated,  were  taken;  and  two  were  tested  for 


-  9  - 


bottle  pressure  by  means  of  a  bottle  pressure  gauge, 
an  illustration  of  which — together  with  an  illustration 
of  the  nitrometer  apparatus  used  for  determining  the 
amount  of  air  in  the  bottled  product — is  given  on  the 
opposite  page. 

The  bottle  pressure  testing  apparatus  is  com- 
posed of  three  parts:  the  gauge — supplied  with  a  piercing 
point, — the  stuffing  box,  and  the  clamping  mechanism. 
The  latter  is  screwed  on  to  the  bottle  to  be  tested,  and 
the  stuffing  box  is  then  clamped  into  place  on  the  top  of 
the  bottle.  The  piercing  point  of  the  gauge,  consisting 
of  a  tapering  hollow  steel  tube,  is  then  inserted  in  the 
stuffing  box;  and  the  stuffing  box  nut  is  tightened  in 
order  to  prevent  the  excape  of  any  gas  and  the  consequent 
loss  of  pressure.  The  top  of  the  hollow  tube  is  provided 
with  an  outlet  valve  through  which  the  gas  is  conducted  from 
the  bottle  to  the  nitrometer. 

After  the  testing  gauge  has  been  clamped  in  place 
on  the  bottle,  the  crown  of  the  bottle  is  pierced  by  giving 
the  top  of  the  gauge  a  sharp  blow  with  the  hand,  and  the 
pressure  within  the  bottle  is  registered  on  the  gauge. 

The  pressure  obtained  in  this  way  represents  the 
saturation  pressure  of  the  product  within  the  bottle. 


-  10  - 


If  the  contents  of  the  bottle  is  now  thoroughly  agitated, 
the  pressure  will  rise  from  five  to  fifteen  pounds.  This 
latter  pressure  represents  the  actual  pressure  of  the  gas 
within  the  liquid  and  is  one  of  the  two  factors  which  de- 
termine the  real  percentage  of  carbonation  of  the  product, 
the  other  factor  being  the  temperature  of  the  liquid. 

The  former  is  referred  to  by  the  trade  as  top 
pressure,  while  the  latter  is  called  liquid  pressure. 

In  some  types  of  filling  apparatus — known  as 
high  pressure  fillers — where  the  crown  is  clamped  on  the 
bottle  immediately  after  filling,  while  the  liquid  within 
the  bottle  is  still  under  pressure,  the  top  pressure  is 
greatly  in  excess  of  the  liquid  pressure  on  account  of  the 
entrained  air. 

However,  in  the  type  of  filling  apparatus  as  des- 
cribed in  the  first  part  of  this  article,  the  liquid  within 
the  bottle  comes  to  atmospheric  pressure  at  the  filling 
temperature,  when  the  bottle  passes  from  the  filler  to  the 
crowner.  Any  excessive  air  which  may  be  in  the  bottle 
during  filling  is  expelled  during  the  brief  exposure  to  the 
atmosphere.  In  this  type  of  apparatus  the  top  or  saturation 
pressure  is  from  five  to  fifteen  pounds  less  than  the 
liquid  pressure. 


-  11  - 


In  each  case  the  saturation  pressure  was  first 
recorded  and  the  contents  of  the  bottle  was  then  well 
agitated  and  the  liquid  pressure  recorded.  The  difference 
between  the  two  pressures  was  tabulated  as  degree 
saturation  at  60  degrees  temperature. 

Barring  any  abnormal  bottles  or  any  defective 
crowns,  it  was  found — after  making  the  necessary  temperature 
corrections — that  for  any  given  carbonating  temperature 
and  pressure,  the  saturation  and  liquid  pressures  did  not 
vary  any  during  the  entire  time  that  the  experiments  were 
conducted. 

Knowing  that  the  presence  of  air  in  the  carbonated 
product  had  a  deleterious  effect  upon  the  latter,  the 
author  worked  on  the  theory  that  the  reason  for  the  product 
improving  with  age  was  the  displacement  of  the  air  in  the 
water  by  the  carbon  dioxide  gas  and  by  subsequent  formation 
of  carbonic  acid.  According  to  the  author's  idea,  this 
displaced  air  would — on  account  of  its  lower  specific 
gravity  than  carbon  dioxide — be  forced  to  the  top  of  the 
bottle,  and  would  be  drawn  off  with  the  first  on  hundred 
cubic  centimeters  of  gas  taken  from  the  bottle  for  analysis. 

With  the  arrangement  of  the  testing  apparatus,  as 


-  12  - 


shown  in  the  illustration,  a  second  series  of  bottles  were 
tested  for  the  amount  of  air  present  in  the  first  one 
hundred  cubic  centimeters  of  gas  drawn  off  at  the  end  of 
each  month. 

Every  precaution  v*dch  could  possibly  affect  the 
result  of  experiment  was  taken.  The  small  piece  of  rubber 
tubing  connecting  the  pressure  testing  apparatus  with  the 
nitrometer  was  filled  with  water  in  order  to  eliminate  the 
air  in  the  tube.  The  water,  which  was  used  in  the  nitrometer, 
was  saturated  with  carbon  dioxide  at  atmospheric  pressure, 
and  a  fresh  supply  of  this  water  was  used  for  each  deter- 
mination. 

The  samples  of  gas  taken  for  analysis  were  col- 
lected as  follows:  the  bottle  pressure  testing  apparatus 
was  clamped  in  position  on  the  bottle  to  be  tested,  and  the 
free  end  of  the  rubber  tubing  was  attached  to  the  outlet 
cock  of  the  testing  gauge.  The  crown  of  the  bottle  was  then 
pierced  by  forcing  the  tube  of  the  apparatus  down  through 
the  crown.  The  pressure  of  the  contents  of  the  bottle  in 
the  quiscent  state  was  then  recorded,  and  the  outlet  cock 
of  the  pressure  testing  apparatus  was  appended.  As  soon  as 
one  hundred  cubic  centimeters  of  gas  had  been  collected  in 
the  nitrometer,  the  outlet  cock  on  the  testing  apparatus 
was  closed  and  the  two  way  stop  cock  on  the  nitrometer  was 

-  13  - 


opened,  the  caustic  potash  solution  passing  into  the  nitrometer 
tube.  After  all  of  the  carbon  dioxide  gas  had  been  con- 
sumed and  the  water  failed  to  rise  any  higher  in  the 
nitrometer  tube,  the  leveling  bottle  was  raised  until  the 
water  level  in  the  bottle  was  on  a  level  with  the  top  of 
the  water  column  within  the  tube.  The  amount  of  air  was  then 
recorded. 

Another  series  of  bottles  were  tested  for  total 
air  content  in  the  following  manner:  the  contents  of  the 
bottles  was  well  agitated  before  the  crowns  were  pierced 
and  the  resulting  pressures  were  recorded.  The  first  one 
hundred  cubic  centimeters  of  gas  were  then  analyzed  for  air 
and  the  results  recorded. 

A  representative  number  of  samples  were  then 
tested  in  the  following  manner  in  order  to  determine  the 
amount  of  air  left  in  the  bottle  after  the  first  one 
hundred  cubic  centimeters  of  gas  had  been  removed,  so  as 
to  compute  a  correcting  factor  for  each  size  bottle,  the 
addition  of  which,  to  the  results  obtained  from  the  first 
one  hundred  cubic  centimeters  taken,  would  give  the  total 
amount  of  air  in  the  bottle.  

Consecutive  samples  of  one  hundred  cubic  centi- 
meters each  were  taken  from  each  bottle  until  the  air  had 
been  entirely  exhausted,  a  condition  which  was  practically 


-  14  - 


obtained  after  ore  thousand  cubic  centimeters  of  gas  had 
been  taken  off,  and  which  was  shown  by  the  last  gas  sample 
registering  practically  100  percent  carbon  dioxide.  The 
results  obtained  from  each  bottle  were  then  added,  and  the 
amount  of  air  obtained  in  the  last  nine  hundred  cubic  centi- 
meters was,  in  most  cases,  practically  a  constant,  but  was 
found  to  vary  with  each  size  of  bottle. 

The  average  results  obtained  in  determining  these 
factors  are  as  follows: 

SPLITS 


p 

INIS 

Volume  of 

gas  taken 

End.  100 

cc. 

3rd.  100 

cc. 

4th.  100 

cc. 

5th.   100 

cc. 

6th.   100 

cc. 

7th.  100 

cc. 

8th.   100 

cc. 

9th.   100 

cc. 

10th.  100 

cc. 

Volume  of 

Volume 

gas 

taken 

of  air 

2nd. 

100  cc. 

.84 

3rd. 

100  cc. 

.45 

4th. 

100  cc. 

.43 

5th. 

100  cc. 

.41 

6th. 

100  cc. 

.40 

7th. 

100  cc. 

.20 

8th. 

100  cc. 

.12 

9th. 

100  cc. 

.10 

10th.  100  cc. 

.05 

Total. . 

. .3.00  cc. 

S 

QUARTS 

Volume 

Volume  of 

Volume 

of  air 

gas 

taken 

of  air 

L95 

2nd. 

100  cc. 

1.20 

.52 

3rd. 

100  cc. 

.70 

.50 

4th. 

100  cc. 

.65 

.40 

5th. 

100  cc. 

.60 

.41 

6th. 

100  cc. 

.60 

.40 

7th. 

100  cc. 

.40 

.20 

8th. 

100  cc. 

.35 

.10 

9th. 

100  cc. 

.20 

.05 

lOtn 

..  100  cc. 

.10 

Total. .. .3.53  cc.  Total. .. .4.80  cc. 


-  15  - 


The  results  obtained  were  all  tabulated  and  the 
calculations  made  as  follows: 

One  U.S.  liquid  02.  is  equivalent  to  29.574  cc. 
The  volume  of  water  in  a  quart  bottle  therefore  equals 
24  x  29.574  cc.  -  709.77  cc. 

Recourse  was  then  had  to  a  table  published  by 
W.  P.  Heath  of  Atlanta,  Ga. ,  which  gave  the  volumes  of  carbon 
dioxide  gas  absorbed  by  water  for  different  temperatures  and 
pressures.  In  this  way  it  was  found  that  one  of  the  bottles 
which  showed  a  bottle  pressure  of  37  lbs.  at  60  degress  F. 
contained  3.77  volumes  of  gas  or  3.77  x  709.77  cc.  or 
2675.8  cc.  of  gas. 

The  first  one  hundred  cubic  centimeters  of  gas 
contained  10.7  cc.  of  air;  this,  with  the  correcting  factor 
of  4.8  cc.  added,  gave  15.5  cc.  as  the  total  air  content  of 
the  bottle. 

The  per  cent  of  air  was  then  calculated  as  follows: 

15.5  x  100  - 

2675.8 -579$ 

The  total  air  in  each  bottle  was  calculated  in  the 
same  manner  and  the  results  were  tabulated. 

The  results  obtained  from  the  analysis  of  the 
first  one  hundred  cubic  centimeters  taken  from  the  bottle 
without  agitating  the  contents  were  tabulated  as  "Air  in 
first  100  cc." 

-  16  - 


Curves  were  then  plotted  embodying  all  of  the 
results  obtained  during  the  entire  series  of  experi- 
ments. 

Two  sets  of  pressure  curves  were  plotted  for 
each  size  of  bottles, — One  set  having  carbonating 
pressures  as  abscissas  and  saturation  pressures  as 
ordinates,  and  the  other  having  carbonating  pressures 
as  abscissas  and  liquid  pressures  as  ordinates. 

A  set  of  curves  was  also  plotted  with  "total 
air  content"  as  ordinates  and  carbonating  pressures 
as  abscissas. 

Three  curves,  one  for  each  size  bottle,  were 
plotted  with  "per  cent  of  air  in  the  first  hundred 
cubic  centimeters  at  saturation  pressure"  as  ordinates 
and  time  of  storage  as  abscissas.  The  data  for  the 
last  three  curves  was  taken  for  the  carbonating 
temperature  of  32  degrees  F.  and  the  carbonating  pressure 
of  60  lbs. 

The  nature  of  most  of  the  pressure  curves  were 
practically  identical,  as  was  also  that  of  the  "total 
air  content"  curves.  A  discussion  of  a  few  of  these 
will  therefore  suffice  for  a  thorough  understanding  of 
the  results  obtained  from  the  entire  experimental  work. 


-  11   - 


The  result  obtained  from  the  analysis  of  the 
total  air  in  the  bottle  substantiated  the  author's 
theory  that  the  elimination  or  retention  of  air  by  the 
water  was  largely  instrumental  in  determining  the 
effeciency  of  carbonation  of  the  product. 

If  the  results — obtained  from  the  analysis  of 
the  total  air  in  the  three  size  bottles:  quarts,  pints 
and  splits — are  inspected,  it  becomes  evident  at  once 
why  a  great  deal  finer  degree  of  carbonation  is 
obtained  in  a  large  size  bottle  than  in  a  smaller  one. 
The  latter  contained  on  an  average  of  about  1.75%  of  air, 
while  the  quarts  contained  on  an  average  of  .4%.     These 
amounts  of  air  may  seem  to  the  reader  to  be  too  small  to 
have  any  dedided  influence  on  the  palatability  of  the 
water;  but — when  it  is  taken  into  consideration  that 
each  volume  of  air  present  in  the  water  not  alone  dis- 
places its  own  volume  of  gas,  but  represents  twenty 
times  the  volume  of  the  latter — it  becomes  evident  that 
the  amount  of  air  given  in  the  tables  is. not  as  trivial 
as  what  it  seems  at  first  sight. 

By  referring  to  the  table  of  pressures  on  page 
26,  the  effect  of  the  more  perfect  elimination  of  air 


-  18  - 


from  the  quarts  than  from  either  the  pints  or  splits 
becomes  evident.  Both  the  saturation  and  liquid  pressures 
of  the  bottles  tested  show  a  marked  increase  for  a 
decrease  in  the  air  content,  varying  from  a  twenty-six 
per  cent  increase  of  the  pints  over  the  splits  to  an 
increase  of  about  thirty-five  per  cent  of  the  quarts  over 
the  latter.  In  other  words,  the  more  perfect  elimination 
of  air  from  the  large  size  bottles  than  from  the  smaller 
size  bottles  produced  about  one  third  more  carbonation 
when  comparing  the  quarts  and  splits,  and  about  a  quarter 
more  carbonation  when  comparing  the  pints  with  the  latter. 

A  study  of  the  pressure  table  shows  that  both 
the  saturation  and  liquid  pressure  vary  directly  as  the 
carbonating  pressures  and  as  the  volume  of  water 
bottled,  and  inversely  as  the  carbonating  temperature. 

Tor  any  given  temperature,  the  increase  in 
either  saturation  or  liquid  pressures  is  not  at  all  in 
proportion  to  the  increase  in  carbonating  pressure,  and 
is  less  marked  for  the  higher  temperatures  than  for 
the  lower. 

From  the  foregoing  conclusion,  it  will  be  seen 
that  the  pressure  loss  at  filling  is  a  good  deal  greater 
for  water  carbonated  at  high  temperatures  and  pressures 


-  19  - 


than  for  the  water  carbonated  at  low  temperatures  and 
pressures.  This  latter  statement  must  not  be  interpreted 
to  mean  that  the  author  advises  the  use  of  a  low  carbon- 
ating  pressure,  but  rather  that  the  loss  of  pressure 
when  carbonating  at  high  pressure  is  disproportionately 
greater  than  when  carbonating  at  low  pressures. 

The  difference  between  the  saturation  and  liquid 
pressures,  which  was  recorded  as  "amount  of  saturation," 
is  practically  constant  for  all  sizes  of  bottles  and 
for  all  conditions  of  temperature  and  pressure. 

After  studying  the  data  obtained  from  the 
pressure  tests,  it  becomes  evident  that  the  best  results 
are  obtained  when  carbonating  at  32  degrees  F.  with  a 
pressure  of  60  to  75  lbs. 

Before  discussing  the  "air  content  curves"  the 
author  wishes  to  explain  the  significance  of  each  of 
the  eight  columns  of  data  given  on  pages  36  to  38  in- 
clusive from  which  the  air  content  curves  were  plotted. 

The  results  are  given  for  each  of  the  four  months 
during  which  the  work  was  done,  and  represents  the  averages 
of  the  duplicate  samples  tested  for  each  determination. 

Each  sheet  shows  the  data  obtained  from  one  size 
bottle  carbonated  at  a  given  temperature  and  at  pressures 
varying  from  30  to  75  lbs.  for  the  quarts  and 


pint  sizes  and  from  30  to  70  lbs  for  the  splits. 

The  second  column  on  each  sheet  fcives  the  number/ 
of  cubic  centimeters  of  air  in  the  first  hundred  cubic 
centimeters  of  gas  taken  from  the  bottle  at  liquid 
pressure.  The  total  number  of  cubic  centimeters  of  air  in 
the  bottle  was  obtained  by  adding  the  constant,  the  deriva- 
tion of  which  was  explained  on  page  14 — 4.8  cc.  for  quarts, 
3.5  cc.  for  pints  and  3.0  cc.  for  splits — to  the  results 
given  in  the  second  column.  The  fourth  and  fifth  column 
give  the  liquid  pressures  and  the  temperature  at  which  the 
determination  of  air  was  made.  The  sixth  column  was  obtained 
by  referring  to  the  table  published  by  H.  B.  Heath  of 
Atlanta,  Ga. ,  which  gives  the  volumes  of  carbon  dioxide 
gas  absorbed  by  water  at  different  temperatures  and 
pressures.  The  liquid  pressure  given  in  column  four  and  the 
temperatures  in  column  five  were  used  to  obtain  the 
results  in  column  six. 

The  figures  in  column  seven  were  obtained  by 
dividing  the  total  number  of  cubic  centimeters  of  air,  as 
given  in  column  three,  by  the  product  of  the  contents  of 
the  bottle  in  cubic  centimeters  and  the  abstract  gas  volume 
figures  in  column  six,  and  the  results  multiplied  by  one 
hundred.  A  sample  calculation  has  been  given  on  page  16. 


-  21  - 


The  figures  in  column  eight  will  be  discussed 
later. 

A  study  of  the  tables  on  pages  26  to  38  shows 
that  the  total  air  content  of  the  bottled  product  varies 
inversely  as  the  volume  of  the  water  bottled  and  directly 
as  the  carbonating  temperature  and  inversely  as  the 
carbonating  pressures.  In  other  words,  high  carbonating 
pressures  eliminate  maximum  amounts  of  air,  while  high 
temperatures  cause  a  retention  of  maximum  amounts  of  air. 

Air  being  the  cause  of  most  of  the  trouble  in 
carbonated  products,  the  results  obtained  from  this 
research  work  prove  that  the  nearest  approach  to  ideal 
results  are  obtained  by  having  the  carbonating  temperature 
as  low  as  possible  and  the  carbonating  pressure  as  high 
as  can  be  obtained  without  making  the  cost  of  the  process 
prohibitive.  High  pressures  demand  large  amounts  of 
carbon  dioxide  gas,  a  great  percentage  of  which  is  lost 
during  the  filling  process;  and,  as  this  loss  increases 
disproportionately  with  the  carbonating  pressure,  the 
latter  should  be  limited  to  about  seventy-five  pounds  for 
practical  purposes.  The  last  column  of  figures  given 
in  the  tables  gives  the  per  cent  of  air  in  the  first 
hundred  cubic  centimeters  of  gas  taken  from  the  bottle 


-  22  - 


at  saturation  pressure  and  repre sent\  the  air  which  has 
been  displaced  in  the  water  by  the  carbon  dioxide  gas. 

According  the  author's  theory — on  which  this 
part  of  the  research  work  was  based — the  amount  of  air 
in  the  first  hundred  cubic  centimeters  of  gas  taken  from 
the  bottle  at  saturation  pressure  would  increase  directly 
as  the  time  of  storage;  but  the  results  obtained  were 
just  the  opposite. 

This  overthrow  of  preexpected  results  proved 
very  puzzling  to  "the  author  until  recourse  was  had  to 
the  chemical  analysis  of  the  water,  a  copy  of  which  is 
given  on  page  39.  The  item  "oxygen  consumed"  undoubtedly 
explains  the  disappearance  of  a  portion  of  the  free 
oxygen  contained  in  the  bottled  product, particularly  so 
when  the  product  was  under  fifty  lbs.  pressure. 

Another  item  that  was  inspected  was  the  iron 
present,  which  was  found  to  be  present  in  the  water  as 
Fe0  and  most  likely  was  oxidized  to  "Fe^Pz   ^n  "^e  Presence 
of  oxygen  under  pressure. 

The  total  air  content  in  any  given  volume  of 
bottled  water — carbonated  at  any  given  temperature  and 
pressure — theoretically  should  not  vary  at  any  time;  but, 


-  23  - 


according  to  the  results  obtained,  the  total  air  content 
diminished  with  each  succeeding  month.  This  phenomena 
can  also  be  explained  by  the  oxidation  of  the  ferrous  iron 
to  the  ferric  state. 

Previous  to  the  author's  taking  charge  of  the 
plant  a  great  deal  of  trouble  was  had  with  the  appearance 
of  a  precipitate  in  the  water  after  it  had  been  on  the 
market  for  about  a  year.  This  precipitate  was  found  to 
be  partially  composed  of  algea,  but  also  of  other 
matter  which  was  not  determined  at  the  time.   It  was 
discovered  by  the  author  that  a  very  poor  grade  of  gas 
was  being  manufactured,  due  to  improper  elimination  of 
air  from  the  apparatus,  which  fault  has  since  been 
remedied. 

During  the  author's  entire  tennure  of  office 
it  has  been  his  custom  to  determine  the  quality  of  the 
carbonating  gas  previous  to  starting  bottling  operations, 
and  at  no  time  has  gas  been  used  which  contained  a 
prohibitive  amount  of  air.  Consequently  there  has  not 
been  a  single  complaint  on  account  of  the  appearance  of 
any  suspended  matter  in  the  bottled  product. 


-  24  - 


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CHEMICAL  ANALYSIS  OF  WATER 


Potassium  Oxide 

Sodium  Oxide 

Lithium  Oxide 

Phosphoric  Acid  Radicle 

Sulphuric  Anhydride 

Silica 

a   .,      M      (Iron  Oxide 
Iron  and  Alumina (Alu]flina 

Lime 

Magnesia 

Arsenic  Acid  Radicle 

Metaboric  Acid  Radicle 

Bromine 

Iodine 

Barium 

Strontium 


Parts  per 
1,000,000 

4,990 
14,580 

Trace 

None 
21,840 
11.800 

0.071 

2.029 

107.550 

58.932 

None 

Trace 

None 

None 

None 

None 


Grains  per 

U.S. Gallon 

0.29181 

0.84094 

Trace 

None 
1.27719 
0.69006 
0.00415 
0.11865 
6.28947 
3.44631 

None 

Tracd 

None 

None 

None 

None 


HYPOTHETICAL  FORM  OF  COMBINATION 


Potassium  Chloride 

Sodium  Chloride 

Sodium  Sulphate 

Magnesium  Sulphate 

Magnesium  Bicarbonate 

Calcium  Bicarbonate 

Iron  Oxide 

Alumina 

Silica 

Sodium  Metaborate 

Lithium  Chloride 

Iron 

Chlorine 

Nitrites 

Nitrates 

Free  Ammonia 

Albuminoid  Ammonia 

Hardness  before  boiling 

Hardness  after  boiling 

Organic  and  Volatile 

Mineral  Matter 

Total  Solids 

Oxygen  Consumed 


Parts  per 

Grains  per 

1,000,000 

U.S. Gallon 

7.895 

0.46169 

1.508 

0.08818 

31.087 

1.81795 

6.517 

0.38111 

205.811 

12.03573 

310.795 

18.18421 

0.071 

0.00415 

2.029 

0.11865 

11.800 

0.69005 

Trace 

Trace 

Trace 

Trace 

0.050 

0.00292 

4.556 

0.27228 

0.001 

0.00005 

None 

None 

0.032 

0.00187 

0.070 

0.00409 

273.600 

16.00000 

109.200 

6.38596 

20.000 

1.16959 

335.000 

19.59064 

355.000 

20.76023 

1.175 

0.06871 

-  39  - 


B  I  BLIOGRAPHY 


J.  C.  GDOssmann,  M.  E. 

The  Carbonic  Acid  Industry. 

The  National  Bottlers'  Gazette. 

The  American  Wine  Press. 

Chemical  Abstracts. 


-  40  - 


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