Pulping with quinones and hydroquinones

USRE32203E · kind E · reissue

Assignee

• Australian Paper Manufacturers Limited · AU

Inventors

• Naphtali N. Vanderhoek · Melbourne, AU
• Peter Nelson · San Jose, US
• Alan Farrington · Melbourne, AU

Key dates

• Filing date: Oct 24, 1984
• Grant date: Jul 15, 1986
• Expiry date: Oct 24, 2004

Classification

• Technology area (CPC —): General

Abstract

A process for the delignification of .Iadd.softwood .Iaddend.lignocellulosic material is described wherein the lignocellulosic material is cooked with .[.an alkaline or.]. .Iadd.a .Iaddend.neutral sulphite pulping liquor, and there is added to the pulping liquor at least 0.001% by weight of an additive compound or mixture of additive compounds selected from quinones and hydroquinones.