Continuous epimerization of sugars, in particular D-arabinose to

Details Continuous epimerization of sugars, in particular D-arabinose to Continuous epimerization of sugars, in particular D-arabinose to

1988-04-22

1991-05-14

Morris, Theodore

Sugar, starch, and carbohydrates

Processes

Carbohydrate manufacture and refining

427 461, C13K 1300

Patent

active

050152963

ABSTRACT:
Pentoses and hexoses are continuously epimerized by heating a sugar in solution in a solvent in the presence of a basic anion exchanger charged with a molybedenum(VI) compound by preparing a D- or L-sugar having cis-disposed OH groups in the 2- and 3-positions of the sugar by continuously passing a homogeneous solution of the corresponding sugar having transdisposed OH groups in the 2- and 3-positions of the sugar in a mixture of water and methanol or ethanol at from 70.degree. to 100.degree. C., preferably at from 73.degree. and 80.degree. C., through a reaction tube which contains the basic anion exchanger charged with the molybdenum(VI) compound, this method being suitable in particular for epimerizing D-arabinose to prepare D-ribose required for the production of riboflavin.

REFERENCES:
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patent: 4263454 (1981-04-01), Schmidt et al.
patent: 4292766 (1981-10-01), Kirk et al.
patent: 4355158 (1982-10-01), Wolf et al.
patent: 4602086 (1986-07-01), Hiroshi et al.
patent: 4778531 (1988-10-01), Dobler et al.
Chemical Abstract, vol. 110, No. 5, "Continuous Process for the Epimerization of Sugars in Particular of D-Arabinose into D-Ribose", Chem. Ab. No. 39316x, Dobler et al., p. 580, Jan. 30, 1989.
Bilik, Author's Certificate 149, 463, Czechoslovak Socialist Republic, Disclosed on 9/29/1972, Issued on 7/15/1973, "Method of Preparation of L-Glucose by Catalized Epimerization of L-Mannose, or L-Mannose Phenylhydrazone" Translated by Quest Technology, Inc. 1603 S. Highland Ave. Arlington Heights, IL 60005.
Chem. Pharm Bull., vol. 28, (1980), p. 1324, "Epimerization of Aldoses Catalyzed by Dioxobis", Abe et al.
Chem. Abstract, vol. 81: 78189k (1974), "L-Ribose by Catalyzed Epimerization of L-Arabinose", Bilik, p. 487.
Chem. Abstract, Band 97, Nr. 13, 27 (Sep. 1982), Seite 647, 1100335y and JP-A-82 54 198.

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