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US 2013/0096296 A1Published application
Methods for Synthesizing Acylated Cellulose Through Instillation of an Acidic Catalyst
AssigneeCelanese Acetate LLC
InventorsMichael T. Combs, Thomas S. Garrett
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Abstract
Instilling an acidic catalyst to a reaction mixture can be beneficial during the acylation of cellulose. Methods described herein can comprise preparing a reaction mixture comprising an acylating agent and cellulose, instilling a catalyst comprising an acid to the reaction mixture, and reacting the cellulose with the acylating agent in the presence of the catalyst, thereby forming an acylated cellulose.
Claims21
A method comprising:
- preparing a reaction mixture comprising an acylating agent and cellulose;
- instilling a catalyst comprising an acid to the reaction mixture;
- and
- reacting the cellulose with the acylating agent in the presence of the catalyst, thereby forming an acylated cellulose.
1 more element
A method comprising:
- preparing a reaction mixture comprising acetic anhydride, cellulose and a first portion of a catalyst comprising at least sulfuric acid;
- instilling at least a second portion of the catalyst to the reaction mixture;
- and
- reacting the cellulose with the acetic anhydride in the presence of the catalyst, thereby forming an acetylated cellulose.
1 more element
A method comprising:
- preparing a reaction mixture comprising acetic anhydride and cellulose;
- instilling a catalyst comprising at least sulfuric acid to the reaction mixture, thereby forming a reaction product that comprises an acetylated cellulose;
- and
- hydrolyzing a portion of the acetyl groups on the acetylated cellulose to produce an acetylated cellulose having a degree of substitution (DS) of about 2.5 or lower.
1 more element
Dependencies are inferred from the claim text.