In sulphate pulp manufacture, the pressure and temperature in the digestor is____________________?
Correct answer: A. 10 atm., 170-180°C
- A. 10 atm., 170-180°C
- B. 10 atm., 800 °C
- C. 1 atm., 170 - 180°C
- D. 1 atm., 800°C
Explanation
Kraft or sulphate pulping digests wood chips with alkaline liquor at about 170 to 180°C, requiring a pressure near 10 atm in the digester. The 1 atm choices cannot maintain this temperature with liquid water-based liquor.
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