First Chemical Corporation

Alan Daniel Farmer

August John Muller

John Robert Eubanks

Amy Lisa Bearson

Diana Boney Haydel

Franklin Dewitt Ford

Arthur C Bayer

Earl G Adams

Brenda J Hook

A process for preparing thioxanthone and derivatives thereof is disclosed. In the process, an aromatic compound, such as cumene, is reacted with thiosalicylic acid (TSA) or dithiosalicylic acid (DTSA) in the presence of sulfuric acid. The reaction mixture, which includes thioxanthone or a derivative thereof, is thereafter distilled under reduced pressure to recover the thioxanthone compound.

Process for preparing thioxanthone and derivatives thereof

Processes for preparing thioxanthone and derivatives thereof

A process for selectively recovering a nitrophenolic by-product from nitration waste water in substantially pure form by solvent extraction is provided. The pH of the waste water is adjusted using an acid to affect the solubility of a particular nitrophenolic by-product in the waste water so that the by-product is selectively separable from the other components of the nitration waste water by solvent extraction.

Selective recovery of a nitrophenolic by-product from nitration waste

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.

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Biloxi, MS, United States of America

Alan Daniel Farmer