J°pt  ?9%rm'  }  Production  of  Glycerin  from  Molasses.  623 
and  this  was  treated  at  the  proper  time  with  soda  ash  in  the  same 
proportion  as  before.  Fermentation  being  complete,  the  whole  two 
gallons  was  added  to  40  gallons  of  a  solution  made  as  follows : 
"  Black  strap "  molasses  was  dissolved  in  sufficient  water  to 
"make  425  gallons  of  wash  at  21. 2°  Balling  at  250  C.  Eight  pounds 
of  ammonium  chloride  was  added,  and  after  the  liquid  had  been 
sterilized  sufficient  sterile  water  was  added  to  bring  it  back  to  the 
original  density.  This  solution  contained  16.85  Per  cent,  of  sugar. 
The  following  are  the  details  of  the  main  fermentation : 
17.11.17.,  9  a.m. — 40  gallons  of  wash  (see  above)  seeded  (see 
above). 
3  p.m. — 2  lb.  soda  ash  added. 
9.15  p.m. — The  40  gallons  added  to  385  gallons  molasses 
wash. 
18.11.17.,  12.30  a.m. — Added  24  lb.  soda  ash  (T.  300  C). 
3.30  a.m. — Added  36  lb.  soda  ash  (T.  31. 50  C). 
5.30  a.m. — Added  48  lb.  soda  ash  (T.  330  C.  Attemper- 
ated  to  300  C). 
11  a.m. — Added  48  lb.  soda  ash  (T.  32. 50  C.  Attemp- 
erated  to  300  C). 
5.30  p.m. — Added  36  lb.  soda  ash  (T.  320  C.  Attemper- 
ated  to  300  C). 
The  fermentation  was  then  allowed  to  proceed  to  completion, 
which  took  five  days,  the  temperature  being  kept  at  about  300  C. 
At  the  conclusion  of  fermentation  the  wash  was  analyzed  and 
the  following  results  were  obtained:  Glycerin,  3.1  per  cent,  by  vol. ; 
alcohol,  6.75  per  cent,  by  vol.;  sugar  (apparent),  0.86  per  cent,  by 
vol. ;  alkalinity,  3.6  Gms.  Na2COs  per  100  Cc. 
The  purification  of  the  fermented  wash  was  then  carried  out 
as  follows :  3,200  lb.  of  the  wash  was  neutralized  in  a  tank  with 
sulphuric  acid,  and  12  gallons  of  a  saturated  solution  of  commercial 
ferrous  sulphate  (copperas)  added.  The  wash  having  been  brought 
to  near  the  boiling  point,  milk  of  lime  was  added  until  there  was  an 
excess  of  lime  in  solution,  when  the  wash  was  boiled  for  half  an 
hour  by  means  of  a  steam  coil.  The  liquid  was  next  passed 
through  a  filter  press,  and  the  cake  steamed.  The  copperas  and 
lime  treatment  was  then  repeated,  and  after  again  being  passed 
through  a  filter  press  the  alkalinity  was  brought  to  0.2  per  cent. 
(Na2C03)  by  the  addition  of  soda  ash.    It  was  then  filter  pressed 
