Process for preparing soluble alkali metal salts of cellulose su

Details Process for preparing soluble alkali metal salts of cellulose su Process for preparing soluble alkali metal salts of cellulose su

1993-09-02

1995-01-03

Nutter, Nathan M.

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

Organic compounds

Carbohydrates or derivatives

536 70, 536 75, 536 83, 536118, 536122, C08B 102, C08B 306, C07H 1312

Patent

active

053788281

ABSTRACT:
The present invention provides a process for the preparation of water soluble alkali metal salts of cellulose sulfate having a degree of substitution ranging from 1 to 3 and viscosity of 1 percent aqueous solution in excess of 20 centipoises (cps). The process involves the use of chlorosulfuric acid as a sulfonating agent in the presence of pyridine used as a solvent in reaction. The important steps of the process for preparation of the water soluble salts include presoaking of the cellulose in pyridine followed by washing the pyridine salt with an alcohol such as methanol and reacting saturated alkali metal bicarbonate or carbonate solutions with the sulfonated cellulose.

REFERENCES:
patent: 4141746 (1979-02-01), Schweiger
patent: 4242506 (1980-12-01), Schweiger
patent: 4389523 (1983-06-01), Okajima et al.

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