Process for the preparation of chemical pulp

Details Process for the preparation of chemical pulp Process for the preparation of chemical pulp

D - Textiles, Paper

21

C

D21C 3/02 (2006.01) D21C 3/00 (2006.01) D21C 3/22 (2006.01) D21C 5/00 (2006.01) D21C 11/04 (2006.01)

Patent

CA 2068642

A B S T R A C T Disclosed is a process for the continuous mass- production of chemical pulp from cellulose raw materials without adversely affecting the global environment and natural resources to a substantially hazardous extent. The process involves the step of digesting the cellulose raw materials at 130° to 200° C with a cooking liquor comprising an alkali solution, hydrogen peroxide, a chelating agent, an anthraquinone and water, the step of obtaining pulp waste liquor and unbleached pulp by subjecting the cellulose raw materials to solid-liquid separation, the step of concentrating and burning the pulp waste liquor to obtain an alkali metal carbonate, the step of adding, if necessary, calcium oxide to the aqueous solution of sodium or/and potassium carbonate to cause causticization, and the step of adding hydrogen peroxide, a chelating agent, and an anthraquinone to the alkali solution to regenerate the cooking liquor.

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