Process for highly substituted carboxyalkyl celluloses and mixed

Details Process for highly substituted carboxyalkyl celluloses and mixed Process for highly substituted carboxyalkyl celluloses and mixed

1984-01-24

1985-03-26

Griffin, Ronald W.

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

Organic compounds

Carbohydrates or derivatives

536 90, 536 91, 536 98, C08B 11193, C08B 1100

Patent

active

045074747

ABSTRACT:
A process for the production of carboxyalkyl celluloses having an average degree of substitution of at least 1.0. The process comprises up to 3 stages, but without any intermediate purification. The preferred suspension medium is isopropanol. In each stage of the process, the carboxyalkylating agent is used in quantities of less than 2.5 moles per mole of anhydroglucose unit and the alkylating agent in quantities of less than 5 moles per mole of anhydroglucose unit. The total water content of the system throughout the reaction as a whole must not exceed 450% by weight, based on the quantity by weight of cellulose used. Water contents of from 80 to 250% by weight are preferred.

REFERENCES:
patent: 3085087 (1963-04-01), Henry et al.
patent: 3088943 (1963-05-01), Cordrey et al.
patent: 3251825 (1966-05-01), Haidasch et al.
patent: 4306061 (1981-12-01), Majewicz
patent: 4310663 (1982-01-01), Hilbig et al.
patent: 4311833 (1982-01-01), Namikoshi et al.
Bull. Soc. Chim. France, 1960, 1750-1754.
Chemical Abstracts, 52, (1958), 19501 a.

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