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What is manufactured from Lignin Sulfonates?

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What is manufactured from Lignin Sulfonates?

(a) Detergents

(b) Paper pulp

(c) Soaps

(d) All of the mentioned

The question was asked in examination.

My question comes from Sulfoxidation topic in chapter Sulfonation and Sulfation of Unit Processes

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The correct choice is (b) Paper pulp

Explanation: water-soluble lignin sulfonates are produced annually as a by-product of the manufacture of paper pulp by heating wood under pressure with an aqueous solution of metallic bisulfite and sulphur dioxide.

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