PROCESS FOR PRODUCING CHEMICAL PULP

Title:

PROCESS FOR PRODUCING CHEMICAL PULP

Document Type and Number:

WIPO Patent Application WO/1992/005309

Kind Code:

A1

Abstract:

A process for the continuous mass-production of chemical pulp from cellulosic material without adversely affecting the global environment and natural resources. The process comprises the step of digesting cellulosic material with a cooking liquor comprising an alkali solution, hydrogen peroxide, a chelating agent, an anthraquinone and water at 130 to 200 °C, the step of subjecting the digestion product to solid-liquid separation to obtain unbleached pulp and waste liquor, the step of concentrating and burning the waste liquor to obtain 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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Inventors:

MITA AKIO (JP)

Application Number:

PCT/JP1991/001234

Publication Date:

April 02, 1992

Filing Date:

September 17, 1991

Export Citation:

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Assignee:

MITA AKIO (JP)

International Classes:

D21C3/00; D21C3/02; D21C3/22; D21C5/00; D21C11/04; (IPC1-7): D21C3/02; D21C11/04

Foreign References:

JPS6350589A	1988-03-03
JPS599677B2	1984-03-03
JPS5668178A	1981-06-08
JPH0160111B2	1989-12-21
JPH01139887A	1989-06-01
JPH0114355B2	1989-03-10
JPS6146595B2	1986-10-15
JPS5112724B2	1976-04-22

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