Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1989-07-10
1991-01-22
Spear, Frank
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210909, C02F 126
Patent
active
049869205
ABSTRACT:
A process of selectively recovering a nitrophenolic by-product, namely 2,4-dinitrophenol and picric acid, from nitration waste water in substantially pure form through the control of the solution pH of the nitration waste water and subsequent precipitation is provided. By adjusting the solution pH of the nitration waste water with an acid to a pH in the range of from about 4.0 to 0.5, the solubility of the selected nitrophenolic by-products is affected and the crystal formation of the individual by-products controlled.
REFERENCES:
patent: 4597875 (1986-07-01), Carr et al.
Adams Earl G.
Bayer Arthur C.
Farmer Alan D.
Hook Brenda J.
Breiner A. W.
First Chemical Corporation
Spear Frank
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