Pulping with an alkaline liquor containing a cyclic keto compound and an amino compound

US4248663A · kind A · utility

Assignee

• Pulp and Paper Research Institute of Canada · CA

Inventors

• George J. Kubes · Dollard-Des-Ormeaux, CA
• James M. MacLeod · Beaconsfield, CA
• Bruce I. Fleming · Senneville, CA
• Henry I. Bolker · Rue du Bois des Loges, CA

Key dates

• Filing date: Jul 5, 1978
• Grant date: Feb 3, 1981
• Expiry date: Jul 5, 1998

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21C3/222
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Lignocellulosic materials such as wood, bagasse, straw, reeds, and other plants and crops can be delignified effectively by a soda-type pulping with an alkaline liquor containing small quantities of both ethylenediamine or like amino compound, and a cyclic keto compound, such as anthraquinone. Pulping rates comparable to kraft are achieved and the pulps thereby obtained have excellent physical properties, especially tear strength.