Process for preparing alkylhydroxyalkylcellulose

Details Process for preparing alkylhydroxyalkylcellulose Process for preparing alkylhydroxyalkylcellulose

C - Chemistry, Metallurgy

08

B

C08B 11/08 (2006.01) C08B 11/02 (2006.01) C08B 11/193 (2006.01)

Patent

CA 2393920

A process of preparing alkylhydroxyalkylcellulose (e.g., methylhydroxyethylcellulose and methylhydroxypropylcellulose) by reaction of cellulose in the presence of alkali metal hydroxide with an alkylating agent and a hydroxyalkylating agent is described. The process includes: (a) alkalizing cellulose by means of 0.9 to 2.9 equivalents of an alkali metal hydroxide I / AGU of the cellulose in the form of an aqueous alkali metal hydroxide solution, in the presence of a suspension medium containing at least 0.2 equivalents of an alkylating agent I / AGU of the cellulose; (b) reacting the alkalized cellulose of step (a) with alkylating agent I and a hydroxyalkylating agent at a temperature above 65°C; (c) adding additional alkali metal hydroxide II in the form of an aqueous alkali metal hydroxide solution; and (d) adding additional alkylating agent II in an amount of at least the absolute value of the difference between (i) the number of equivalents of alkylating agent I / AGU of the cellulose already added, and (ii) the total number of equivalents of alkali metal hydroxide AGU of the cellulose added. Additional alkylating agent II is not added in step (d) if (i) the number of equivalents of alkylating agent I / AGU of the cellulose already added exceeds (ii) the total number of equivalents of alkali metal hydroxide / AGU of the cellulose already added. In a further step (e), the alkylhydroxyalkylcellulose is isolated from the reaction mixture. The isolated alkylhydroxyalkylcellulose may be optionally purified.

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