Investigation of the effect of additives of surfactants in the cooking solution on the quality of sulfate hardwood cellulose

The article discusses the prospects for the use of surfactants in sulfate cooking. The presence of surfactants reduces the surface tension between the liquid and the wood chips, which promotes the rapid penetration of the liquor into the inner matrix of the chips and ensures selective delignification, reducing the amount of undercooked pulp and the content of extractives in the resulting pulp. Studies of the component composition of hardwood, which is a mixture of birch and aspen, showed that the content of extractive substances in it was 1.037%. Sulfate cooking was carried out according to the classical scheme and with additives of surfactants of the Dispersol brand. The consumption of surfactants for cooking was 0.1% of the weight of absolutely dry wood. As a result of the brews, technical sulfate pulp was obtained, the total yield of deciduous pulp was determined, the amount of the amount of undercooked pulp in the obtained pulp, and the pulp was analyzed for the content of residual lignin and extractives. Studies have shown that the addition of Dispersol brand surfactants to sulfate cooking solution has little effect on the yield of pulp and the content of residual lignin. The amount of undercooked pulp content of the obtained pulp, when surface-active substances of the Dispersol PCS 306 brand are added to the cooking solution, is reduced by 14% compared to cooking without additives. At the same time, the use of additives of surfactants in the cooking solution for sulfate cooking of hardwood makes it possible to reduce the content of extractives in the resulting pulp by 2-6 times. The presence of these surfactants in the cooking solution reduces the surface tension of the spent black liquor by 5-6%, but their low cooking consumption should not significantly affect the operation of the evaporators.

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