Black liquor generated during paper manufacture is concentrated in a___________________?
Correct answer: C. Multiple effect evaporator
- A. Single effect evaporator
- B. Single effect evaporator followed by a crystalliser
- C. Multiple effect evaporator
- D. Multiple effect evaporators followed by a crystalliser
Explanation
Black liquor is normally concentrated economically in multiple-effect evaporators, where vapour from one effect heats the next. Crystallisation is not the usual final step for producing concentrated black liquor.
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