Process for preparing carboxypolysaccharide

Details Process for preparing carboxypolysaccharide Process for preparing carboxypolysaccharide

1998-11-05

2000-10-10

Lee, Howard C.

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

Organic compounds

Carbohydrates or derivatives

536124, 564 75, C08B 3118, C08B 3308, C08B 3508, C08B 3700, C07C33300

Patent

active

061303283

ABSTRACT:
There is herein disclosed a process for preparing a carboxypolysaccharide by oxidizing a polysaccharide with a combination of a transition metal compound and an oxidizing agent, said process comprising the step of separating the transition metal from a reaction mixture with a chelating agent. According to the present invention, the transition metal can be removed to a low concentration of less than 100 ppm from an aqueous solution including the transition metal and the tricarboxypolysaccharide. The process of the present invention is important to reduce the loss of a transition metal catalyst such as the ruthenium catalyst and to industrially manufacture a purified tricarboxypolysaccharide.

REFERENCES:
patent: 3848048 (1974-11-01), Moore
R.E. Harmon et al., "Air-Oxidation of Starch using Quinquevalent as Catalyst", Die Starks, vol. 23, No. 4, Apr. 1, 1971, pp. 125-128.
Database WPI, Derwent Publications Ltd., AN 125418, Jan. 30, 1993; SU 1791752.

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