Process for the preparation of concentrated aqueous, substantial

Details Process for the preparation of concentrated aqueous, substantial Process for the preparation of concentrated aqueous, substantial

1985-12-06

1990-09-11

Higel, Floyd D.

Bleaching and dyeing; fluid treatment and chemical modification

Reactive dye composition, process, or product

Alkylene sulfato, halotriazine, halodiazine,...

534617, 534618, 534632, 534633, 534634, 534635, 534636, 534637, 534638, 534583, 534588, 534887, C09B 6208, C09B 62085, D06P 1382, D06P 366

Patent

active

049559877

ABSTRACT:
The invention describes a process for the preparation of concentrated aqueous, substantially salt-free solutions of aminotriazinyl reactive dyes, which process comprises starting from a dye which contains sulfo groups and one or more radicals capable of reaction with cyanuric halide, said dye being at least partly in the form of the ammonium salt, reacting said dye with cyanuric halide, in the presence of lithium hydroxide, and deionizing and concentrating the salt-containing synthesis solution by a membrane separation process.
The so prepared mixed lithium/ammonium salts of the acid aminotriazinyl reaction dyes are readily water soluble and are suitable for the preparation of concentrated storage stable dye solutions.

REFERENCES:
patent: 3621008 (1971-11-01), Ross et al.
patent: 4189380 (1980-02-01), Booth et al.
patent: 4314818 (1982-02-01), Courtin
patent: 4412948 (1983-11-01), Omura et al.
patent: 4523924 (1985-06-01), LaCroix
patent: 4560746 (1985-12-01), Rebhahn et al.

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