| 摘要 |
The invention relates to a method for producing cellulose acetate with a DS between 1.5 and 2.9 by reacting cellulose with an acetylation agent. According to said method, the cellulose is reacted with a first acetylation agent using a base catalyst in a first step, to form a cellulose acetate with a DS of less than 1, and then reacted with a second acetylation agent using an acid catalyst in a second step to form a cellulose acetate with a DS of 1.5 to 2.9. The first and second acetylation agents are preferably acetic anhydride. The cellulose is preferably impregnated with an excess base in the first step, said base then being removed until the quantity of base which is stoichiometrically necessary to form the cellulose acetate with a DS<1 is achieved. |
