Process for producing pulp

Details Process for producing pulp Process for producing pulp

D - Textiles, Paper

21

C

9/11

D21C 3/16 (2006.01)

Patent

CA 1116816

ABSTRACT OF THE DISCLOSURE The process for producing pulp according to the present invention consists in the subsequent steps of an aqueous treat- ment of a vegetable stock at a temperature within the range of from 110 to 170°C under a pressure of from 2 to 7 atm.g. for a period of from 0.3 to 4 hours at a weight ratio of the vegetable stock to water of 1:2-4 respectively; a simultaneous impregnation and a cooking of said vegetable stock in a solution of nitric acid at a temperature of from 70 to 90°C for 0.5-3 hours; cooking at a temperature of from 100 to 130°C under a pressure of from 1 to 4 atm.g. for 0.3-0.5 hour; an alkali extraction of the vegetable stock; decontamination of the gaseous cooking products by mixing thereof with the air in a volumetric ratio of 1:0.5-1 respectively, and treatment with the spent liquor resulting from the stage of alkali extraction. The process according to the present inven- tion makes it possible to increase the vield of pulp and sub- stantially improve its quality characteristics.

307910

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