Continuous addition process for preparing...

Details Continuous addition process for preparing... Continuous addition process for preparing...

C - Chemistry, Metallurgy

08

B

260/217

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

Patent

CA 1205802

ABSTRACT OF THE INVENTION Higher reaction efficiencies are seen in cellulose etherification reactions when the reagents are continuously added to alkali cellulose at elevated temperatures. In particular, mixed hydroxyalkylcellu- lose ethers made from a C3 or higher alkylene oxide and an etherifying agent other than an alkyle oxide are prepared at elevated temperatures with higher reaction efficiencies using this process. In an especially preferred embodiment, hydroxypropylmethyl- cellulose is prepared by continuously adding propylene oxide to heated cellulose containing a small amount of caustic, adding more caustic and then continuously adding chloromethane at elevated temperatures.

453093

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