Precipitation of organic dyes and dye intermediates in the prese

Details Precipitation of organic dyes and dye intermediates in the prese Precipitation of organic dyes and dye intermediates in the prese

1973-12-17

1976-03-16

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260180, 260205, 260206, 260207, 2602071, 260208, 260379, 260562A, 260575, 260591, C07C10706, C09B 1122, C09B 2900, C09B 3102

Patent

active

039445402

ABSTRACT:
Organic dyes or dye intermediates are crystallizable in an aqueous medium in the presence of finely divided, solid polytetrafluoroethylene (hereinafter referred to as "PTFE") resin particles. Crystals of desirable, very small size are precipitated more quickly than with conventional seeding. This process is particularly useful for crystallizing disperse dyes of two types:

REFERENCES:
patent: 2687410 (1954-08-01), Hanke
patent: 3016384 (1962-01-01), Caliezi
patent: 3071815 (1963-01-01), MacKinnon
patent: 3356443 (1967-12-01), Dziomba
patent: 3755291 (1973-08-01), Demler et al.
Kirk-Othner, "Encyclopedia of Chemical Technology," Vol. 6, pp. 486-488 (1965).
Kuznetsov et al., Chemical Abstracts, Vol. 71, p. 331, Item No. 7238h (1969).

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