Process for the oxidation of di-, tri-, oligo- and polysaccharid

Details Process for the oxidation of di-, tri-, oligo- and polysaccharid Process for the oxidation of di-, tri-, oligo- and polysaccharid

1998-09-08

1999-11-02

Geist, Gary

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

Organic compounds

Carbohydrates or derivatives

5361231, 53612313, C07O 1700, C13K 1300

Patent

active

059773502

ABSTRACT:
A process is provided for preparing polyhydroxycarboxylic acids by the selective oxidation of di-, tri-, oligo- and polysaccharides in an alkaline medium using an oxygenous gas in the presence of palladium on a carrier as catalyst and bismuth as promoter at a palladium concentration in the reaction mixture of at least about 40 mg/l and a molar ratio of bismuth to palladium in the range of from about 1:5 to about 1:40, in which process towards the end of the reaction, as soon as a strong increase is observed in the oxygen concentration in the liquid phase, the oxygen supply is reduced until it is not more than about 20 ppm. In this manner, virtually all of the polysaccharide added beforehand is converted into the desired end product without an unacceptably high concentration of bismuth in the end product.

REFERENCES:
patent: 4985553 (1991-01-01), Fuertes et al.
H.E.J. Hendriks et al., "The Effect of Bismuth on the Selective Oxidation of Lactose on Supported Palladium Catalysts", Carbohydrate Research, 204 (1990), pp. 121-129.
Derwent Patent Abstract No. 68340/B (1979).
Derwent Patent Abstract No. 89-316885/44 (1989).

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