Black liquor is converted into white liquor by __________________________?
Correct answer: B. Evaporation and burning the concentrate followed by causticisation of products
- A. Multi-effect evaporation only
- B. Evaporation and burning the concentrate followed by causticisation of products
- C. Selective liquid extraction
- D. Extractive distillation
Explanation
In kraft recovery, black liquor is concentrated and burned to form smelt, whose sodium compounds are then causticised to regenerate white liquor. Evaporation alone cannot complete this chemical conversion.
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