Nonsulphur chemimechanical pulping process

Details Nonsulphur chemimechanical pulping process Nonsulphur chemimechanical pulping process

D - Textiles, Paper

21

H

9/16

D21H 3/02 (1985.01)

Patent

CA 1218808

NONSULFUR CHEMIMECHANICAL PULPING PROCESS Abstract of the Disclosure 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 akanolamine 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.

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