Abstract
In some small soda pulp plants which have no equipments to recover sodium hydroxide from the waste liquor, sodium sulfide is added to the soda cooking liquor to speed up the pulping reaction and to obtain a product of improved strength properties. We studied on using of powdered sulfur instead of sodium sulfide in such small plants in order to decrease the cost for pulping chemicals.Wood chips fo P. densifiora were cooked with the sulfur-soda cooking liquors which were prepared by dissolving various amounts of powdered sulfur to the sodium hydroxide solutions, and the pulp yield, the lignin content of pulp, and the strengths of pulp were determined. In the case of using the cooking liquor containing sulfur of about 12% on the weight of sodium hydroxide, the pulping reaction proceeded most rapidly and the pulp obtained was as strong as sulfate pulp.Wood chips were precooked with a solution of lime and sulfur at 100°C, and then cooked with a soda cooking liquor. By this method, the delignification reaction proceeded more easily.
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