Discussion
Arrange the stages of the kraft process in order.
1. wash the pulp and separate the black liquor
2. chip the wood and screen the chips
3. recover chemicals by evaporation and burning
4. cook the chips in white liquor in a digester
Answer: D
Correct answer: 2 - 4 - 1 - 3
Chips are made and screened to a uniform size so they cook evenly, cooked in white liquor until the lignin is dissolved, washed so the pulp is separated from the spent black liquor, and the black liquor is then evaporated and burned to recover the chemicals. The recovery step comes last because it works on what the washing produced, and it is what makes the process economic.
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