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US 7,892,397 B2Granted
Method of degumming cellulosic fibres
AssigneeAlberta Innovates - Technology Futures
InventorsKeith Luo, Wade Chute
Life of this patent
Estimating the term…
Abstract
A process for producing dissolving pulp includes a degumming step using a degumming liquor which includes hydrogen peroxide and ammonia.
Claims16
A method of degumming cellulosic fibres comprising the step of treating the fibres with a degumming liquor comprising between about 5% to about 30% (v:v) aqueous ammonia and between about 0.5% to 3% (on OD fibre) hydrogen peroxide, at a temperature between about 50° to about 200° C., at a consistency of about 3:1 to about 20:1 liquor to solids (v/w).
A method of forming dissolving pulp from bast fibre plants, comprising the steps of:
- (a) pulping the plant fibre with a degumming liquor comprising about 5% to about 30% (v:v) aqueous ammonia and between about 0.5% to 3% (on OD fibre) hydrogen peroxide;
- (b) recovering and recycling an aqueous portion from step (a);
- (c) recovering the pulped fibres and bleaching to produce dissolving pulp.
Dependencies are inferred from the claim text.