Process for the wet granulation of organic pigments in an aqueou

Details Process for the wet granulation of organic pigments in an aqueou Process for the wet granulation of organic pigments in an aqueou

1984-05-16

1985-08-13

Higel, Floyd D.

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

Organic compounds

Azo

106 23, 106288Q, 106308Q, 106309, 26024572, 534747, 534760, 534874, 534887, 546 32, 548558, C09B 500, C09B 4600, C09B 4700, C09B 5704

Patent

active

045351511

ABSTRACT:
A process for the wet granulation of organic pigment is disclosed which consists in treating under vigorous agitation an aqueous suspension of pigment with acetic anhydride, propionic anhydride or a mixture thereof. Acetic anhydride is used preferentially. After hydrolysis of the anhydride, besides the granules, an aqueous solution of acid or its corresponding salt, directly saleable or re-usable in the chemical industry, is recovered whereby problems related to the recovery of organic solvents are avoided.

REFERENCES:
patent: 3523030 (1970-08-01), Malin et al.
patent: 4133695 (1979-01-01), Wheeler et al.
patent: 4202815 (1980-05-01), Wegmann
patent: 4230855 (1980-10-01), Capaccioni et al.
Farnand et al. Canadian J. Chem. Engr., volume of Apr., 1961, pp. 94 to 97.

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