Process for preparing a highly concentrated aqueous press cakes

Details Process for preparing a highly concentrated aqueous press cakes Process for preparing a highly concentrated aqueous press cakes

1985-11-05

1988-11-15

Higel, Floyd D.

Organic compounds -- part of the class 532-570 series

Organic compounds

Azo

534581, 534863, C09B 4100, C09B 6738, C09B 6740, C09B 6754

Patent

active

047850825

ABSTRACT:
According to the invention, addition of one or more surfactants having a cloud point in aqueous solution to an aqueous suspension of an azo disperse dye gives after the isolation of the dye at a temperature above the cloud point aqueous press cakes containing a large amount of this dye.
The direct processing of press cakes as obtained for example after the synthesis and isolation of azo disperse dyes to practical dispersions for use requires a minimum dye content in the press cakes. The minimum content is frequently not obtained when conventional methods of isolation are used, so that it is necessary to proceed via the indirect route of drying to obtain powders and redispersing the powders. By using the process according to the invention it is possible to cut out the costly indirect route or, if desired, to reduce the expense of drying to obtain powders by an appreciable margin.

REFERENCES:
patent: 3672817 (1972-06-01), Falkehag et al.
Kataoka et al., Chem. Abs. 93:169620h (1980) (=Japanese Publ. Appl. 80/99,336).
Mitsui Toatsu Chemicals, Inc., Chem. Abs. 94:17058p (1981) (=Japanese Pub. Appl. 80/104,358).
Mitsubishi, Chemical Abstracts, vol. 101, 72598c (1984).

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