Process for producing pulp

Details Process for producing pulp Process for producing pulp

1978-07-20

1979-08-21

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

162 50, 162 51, 162 29, 162 81, 162 90, D21C 316

Patent

active

041652533

ABSTRACT:
The process for producing pulp according to the present invention consists in the subsequent steps of an aqueous treatment of a vegetable stock at a temperature within the range of from 110.degree. to 170.degree. 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 cooking of said vegetable stock in a solution of nitric acid at a temperature of from 70.degree. to 90.degree. C. for 0.5-3 hours; cooking at a temperature of from 100.degree. to 130.degree. 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 invention makes it possible to increase the yield of pulp and substantially improve its quality characteristics.

REFERENCES:
patent: 2110546 (1938-03-01), Dreyfus
patent: 3726756 (1973-04-01), Polak
Paper Trade Journal, Dec. 18, 1972, pp. 36-37.

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