Discussion
Major cooking chemical used in Sulphate-Alkaline process of paper making is
Answer: B
The major cooking chemical is sodium hydroxide (NaOH).
In the sulphate (kraft) process, wood chips are cooked in white liquor, a solution of sodium hydroxide and sodium sulphide, which dissolves the lignin and frees the cellulose fibres. The process takes its name from the sodium sulphate added to make up chemical losses, which is reduced to sodium sulphide in the recovery furnace.
So sodium sulphate is the make-up chemical rather than the cooking agent, the trap in option D. Sodium nitrate and sodium chloride are not used in the process.
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