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公开(公告)号：JPS6353283A
公开(公告)日：1988-03-07
申请号：JP20323987
申请日：1987-08-17
Applicant: BASF AG
Inventor： UORUFUGANGU HAABERUMAN , UDOO MAIYAA , PEETAA HAMUMESU , BERUNTO RANDOMAN
IPC: C25B3/02
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 C2-C4-alkanol, urea, a urea derivative or a mixture thereof, at a potential epsilon h
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