A-cell Acetyl Cellulosics Ab

Bp Chemicals Limited

David Ian Richards

Helen Louise Nelson

Rune Simonson

Acetylation of lignocellulosic fibres

Acetylation of lignocellulosic materials

This invention relates to a process for the acetylation of lignocellulosic materials (LM) by (a) bringing the LM into the intimate contact with an acetylating agent comprising acetic anhydride at a temperature from 70.degree.-140.degree. C. and (b) bringing the acetylated LM from step (a) into contact with a superheated chemical agent comprising acetic acid and/or anhydride at a temperature above 140.degree. C. so as to reduce the acetic acid or acetic anhydride content of the acetylated LM to below 10% by weight. LM's treated in this manner have excellent dimensional stability.

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Humberside, United Kingdom

David Ian Richards