Process for producing an alkali salt of a carboxymethylcellulose

Details Process for producing an alkali salt of a carboxymethylcellulose Process for producing an alkali salt of a carboxymethylcellulose

1982-09-10

1984-01-17

Griffin, Ronald W.

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

Organic compounds

Carbohydrates or derivatives

536 85, C08B 1100, C08B 1120

Patent

active

044265182

ABSTRACT:
A process is disclosed for the preparation of an alkali salt of a carboxymethylcellulose ether by reacting a cellulosic material with an etherifying agent, in the presence of an alkali, in an aqueous organic solvent, wherein the improvement comprises adding the etherifying agent and only part of the entire amount of said alkali in the initial stage of the reaction, thereby initiating the etherification reaction in the presence of an excess amount of the etherifying agent such that the molar ratio of ##EQU1## is in the range of 0.10 to 0.99; and subsequently adding the remainder of said alkali in one or more portions in a second stage and carrying out the etherification reaction in such a manner that said molar ratio of alkali etherifying agent in the final stage becomes at least 1.00.
An additional embodiment of the invention comprises repeating this procedure using the product of the first reaction as the starting material in the second reaction, whereby an alkali carboxymethylcellulose salt having a high degree of substitution can be obtained.

REFERENCES:
patent: 3678031 (1972-07-01), Schoggen
patent: 3900463 (1975-08-01), Yada et al.
patent: 3965091 (1976-06-01), Holst et al.
patent: 4017671 (1977-04-01), Schminke et al.
patent: 4063018 (1977-12-01), Ohnaka et al.
patent: 4091205 (1978-05-01), Onda et al.

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