Process for preparing hydroxyalkylcellulose ethers

Details Process for preparing hydroxyalkylcellulose ethers Process for preparing hydroxyalkylcellulose ethers

1983-07-08

1984-10-16

Griffin, Ronald W.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

536 90, 536 95, C08B 1108, C08B 11193

Patent

active

044776578

ABSTRACT:
Higher reaction efficiencies are seen in cellulose etherification reactions when the reagents are continuously added to alkali cellulose at elevated temperatures. In particular, mixed hydroxyalkylcellulose ethers are prepared with higher reaction efficiencies using this process. In an especially preferred embodiment, hydroxypropylmethylcellulose is prepared by continuously adding propylene oxide to heated cellulose containing a small amount of caustic, adding more caustic and then continuously adding methyl chloride at elevated temperatures.

REFERENCES:
patent: 2831852 (1958-04-01), Savage
patent: 2835666 (1958-05-01), Savage
patent: 3131176 (1964-04-01), Klug
patent: 3388082 (1968-06-01), Rodgers et al.
patent: 3709876 (1973-01-01), Glomski et al.
patent: 3839319 (1974-10-01), Greminger et al.
patent: 3873518 (1975-03-01), Strange et al.
patent: 4096325 (1978-06-01), Teng et al.

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