Nonsulfur chemimechanical pulping process

Details Nonsulfur chemimechanical pulping process Nonsulfur chemimechanical pulping process

1983-11-25

1985-10-22

Smith, William F.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Simultaneous mechanical defibration and chemical treatment

162 72, 162 90, D21C 302, D21C 320

Patent

active

045486751

ABSTRACT:
A nonsulfur chemimechanical pulping process for producing pulp from woody materials is disclosed. The process is particularly suited for producing corrugating medium pulp from hardwood chips although the process can be adapted to production of other types of pulp and can use other types of woody materials. The process comprises impregnation and dilution of the chips in a dilute aqueous pulping solution of a lower alkanolamine catalyzed with ammonium hydroxide. The preferred alkanolamine is monoethanolamine present in a weight ratio to ammonium hydroxide of about 1 part to 1 part or less to 1 part to 3 parts or more. The pulping solution may be repeatedly reused and the process of this invention does not produce environmentally objectionable by-products.

REFERENCES:
patent: 2192202 (1940-03-01), Peterson
patent: 4259147 (1981-03-01), Gordy
patent: 4397712 (1983-08-01), Gordy
Tappi Sep. 3, 1972 pp. 107-114.

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