Chemical Additives and Reactions
|
| A |
White Liquor added to wood chips.
(Na2S + Na OH + Na2CO3) |
B |
Black Liquor washed out. |
C |
Pulp treated with Chlorine to oxidize Lignin. |
 |
| D |
Pulp extracted with Caustic Sods to remove Lignin. |
E |
Pulp treated with Sodium Hypochiorite
(Na OCI) |
F |
Pulp treated with Chlorine Dioxide
(CI O2) to increase whiteness. |
|
| G |
Bleached pulp slurry. Rosin, Alum, Dyes, Clay, Titanium Dioxide (TI O2), added. |
H |
Paper sheet formed here through dewatering. Rosin and Alum react to size the paper (make it more waterproof). |
I |
Black Liquor (Spent White Liquor + Lignins from Wood). |
|
| J |
Converts Black Liquor + added saltcake to Green Liquor thru combustion
1. Na2SO4 ---> Na2S
2. Na Lignin ---> Na2CO3 |
K |
Contains Green Liquor
(Na2CO3 + Na2S) |
L |
Converts Green Liquor to White Liquor
(Na2S + NaCO3 + Ca (OH)2 ---> Na OH + Na2S + Ca CO3) |
|
| M |
Calcium Carbonate (Ca CO3) is settled out and sent to Lime Kiln. Clarified White Liquor goes back into new cooking cycle at Piont A. |
|
