Preparation of water-soluble food-grade triphenylmethane colors

Details Preparation of water-soluble food-grade triphenylmethane colors Preparation of water-soluble food-grade triphenylmethane colors

1987-07-31

1988-10-04

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

C25B 302

Patent

active

047754516

ABSTRACT:
A process for the preparation of a water soluble food-grade diaminotriphenylmethane colorant containing from 2 to 4 sulfo groups, comprising anodically oxidizing the corresponding leuco compound in an electrolysis cell divided into an anode space and a cathode space in the presence of from 0.01 to 2% by weight, based on the solution being oxidized, of a C.sub.2 -C.sub.4 -alkanol, urea, a urea derivative or a mixture thereof, at a potential .epsilon..sub.h .ltoreq.1250 mV and at a temperature .ltoreq.+40.degree. C. The colorants obtained are produced in high yield and are of food quality.

REFERENCES:
patent: 1802640 (1931-04-01), Ewing et al.
patent: 3758394 (1973-09-01), Dellian et al.
patent: 4464236 (1984-08-01), Noding
Encyclopedia of Chem. Technology, Third Ed. by Kirk-Othmer, vol. 3, pp. 400-403, vol. 6, p. 574.
Journal of Organic Chemistry, vol. 44, pp.761-766.
Chemical Abstracts, vol. 92, 1980, No. 163717c (=Japanese Preliminary Published Application 130,481/1979).

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