Acetylation of lignocellulosic materials

Details Acetylation of lignocellulosic materials Acetylation of lignocellulosic materials

C - Chemistry, Metallurgy

08

H

C08H 8/00 (2010.01) B27K 3/36 (2006.01) B27K 5/00 (2006.01) C08B 3/06 (2006.01)

Patent

CA 2133936

This invention relates to a process for the acetylation of lignocellulosic materials (LM) by (a) bringing the LM into intimate contact with an acetylating agent comprising acetic anhydride at a temperature from 70-140°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°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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