| 摘要 |
A method of continuously producing paper pulp by integrating the process steps of impregnating fiber material and boiling the impregnated fiber material, the boiling being commenced with digesting liquor containing white liquor of high sulphidity. According to the invention the process includes a pretreatment of the fiber material in a tank (1) with a liquid containing alkali metal bicarbonate and alkali metal hydrogen sulphide. The pretreatment liquid is brought into contact with the fiber material under reducing pressure, whereby, through the pressure reducing and under the influence of heat in situ, said compounds from H2S, CO2 and alkali metal carbonate so that a part of the H2S and HS<-> formed is absorbed by or diffused into the fiber material, while said CO2 is withdrawn from the tank. A liquor is formed during the pretreatment, which contains said alkali metal carbonate and which is withdrawn from the fiber material.
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