Acetylation of lignocellulosic materials

摘要

PCT No. PCT/GB95/00371 Sec. 371 Date Jul. 25, 1996 Sec. 102(e) Date Jul. 25, 1996 PCT Filed Feb. 23, 1995 PCT Pub. No. WO95/23168 PCT Pub. Date Aug. 31, 1995The 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 as the major component at a temperature from 80 DEG -140 DEG C. and (b) bringing the acetylated LM from step (a) into contact with a heated gas inert under the reaction conditions in a stripper at a temperature above 140 DEG C. and reducing the acetic acid or acetic anhydride content of the acetylated LM produced in step (a) to below 10% by weight by stripping. Products fabricated from LMs so treated are highly dimensionally stable.