Process for drying finely divided pigments

Details Process for drying finely divided pigments Process for drying finely divided pigments

1981-03-10

1983-01-18

Camby, John J.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

F26B 504

Patent

active

043685820

ABSTRACT:
A process for drying finely divided pigments contained in a press cake or a suspension, wherein a mixture of the pigment and a liquid whose critical temperature is below the decomposition temperature of the pigment is heated under pressure to above the critical temperature of the liquid and is then released while keeping the temperature above the dew line of the liquid. The process gives fine pigments powders which are easily dispersible in the media in which pigments are used, and which produce deep, brilliant colorations.

REFERENCES:
patent: 2024611 (1935-12-01), Stutz et al.
Handbook of Chemistry and Physics, Charles D. Hodgman, M.S. 39th ed., p. 2125.
Elements of Physical Chemistry, Samuel Glasstone and David Lewis, Liquefaction and the Properties of Liquids, pp. 118-119.

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