Question

Cooking liquor in case of sulphite process is

• A. Sodium sulphide and sodium bisulphide
• B. Magnesium sulphide and magnesium bisulphite
• C. Sodium sulphite and sodium bisulphite
• D. Magnesium sulphite and magnesium bisulphite

Hint:

Sulphite pulping uses sulphite and bisulphite cooking liquor, while kraft process uses sodium hydroxide and sodium sulphide.

Answer 1

The Correct Option is C

The sulphite process is used in pulp and paper manufacture. In this process, wood chips are cooked with sulphite cooking liquor. The purpose of cooking liquor is to dissolve lignin and separate cellulose fibres. In the sulphite process, the cooking liquor contains sulphite and bisulphite salts. According to the given options, the correct cooking liquor is: \[ \text{Sodium sulphite and sodium bisulphite}. \] Sodium sulphide is associated with kraft or sulphate process, not sulphite process. Therefore, the cooking liquor in case of sulphite process is: \[ \text{Sodium sulphite and sodium bisulphite}. \]