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3. Acetate manufacturing, process and technology 3.1 Chemistry of cellulose acetylation
Author(s) -
Steinmeier Hans
Publication year - 2004
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200450405
Subject(s) - acetic anhydride , acetylation , acetic acid , cellulose , hydrolysis , sulfuric acid , hydroxyl value , cellulose acetate , chemistry , organic chemistry , catalysis , degradation (telecommunications) , polymer chemistry , chemical engineering , biochemistry , polyol , telecommunications , computer science , polyurethane , gene , engineering
Abstract Nowadays Celluloseacetate is mainly produced with the acetic acid process. After an activation with acetic acid and sulfuric acid the acetylation of the cellulose starts by adding acetic anhydride. The temperature and the catalyst concentration play an important role for the reaction. Beneath acetylation also degradation of the cellulose chains occurs. In the first step of the process cellulosetriacetate is formed. In a second step, the hydrolysis, several acetyl groups are removed to achieve an average degree of substitution of 2,5. The water content in this step influences the acetyl distribution.