Ppg Industries, Inc.

James A Cook, Jr

William A Keim

James A Manner

Steven E Pamer

The yield and purity of 2-halomethyl-1,3-cyclic acetals is improved by subjecting the reaction product of 1,2-dihaloethyl acetate and aliphatic diol to alkaline hydrolysis. The resulting aqueous and organic phases are separated and the organic phase distilled to recover the 2-halomethyl-1,3-cyclic acetal product.

Process for producing 2-halomethyl-1,3-cyclic acetal

This invention relates to an improvement in the process of isolating certain diphenyl ethers from an aprotic organic solvent by the addition of a diphenyl ether phase forming amount of water to a reaction mixture comprising a liquid phase of the diphenyl ether dissolved in the solvent.

Process improvement for diphenyl ether production

Chlorothiolformates are prepared by reacting a mercaptan with phosgene in the presence of a catalytic amount of anion exchange resin in the neutral salt form. Preferably the resin has quaternary ammonium functionality.

Process for preparing chlorothiolformates

Chlorothiolformates are prepared by reacting a mercaptan with phosgene in the presence of a catalyst selected from a group consisting of (1) secondary amine and (2) secondary amine hydrochloride.

Chlorothiolformates are prepared by reacting a mercaptan with phosgene in the presence of a catalytic amount of a quaternary ammonium salt.

This invention relates to the treatment of an isomeric mixture of chloronitrobenzenes to provide a product higher in meta-chloronitrobenzene content, and lower in ortho-chloronitrobenzene and para-chloronitrobenzene content. In particular, a liquid mixtuure of ortho-, meta-, and para-chloronitrobenzene isomers containing a major amount of the meta isomer is solidified by dispersing the isomeric mixture in a partially miscible solvent at temperatures below the melting point of meta-chloronitrobenzene, the solvent and its temperature being selected so that the chloronitrobenzene isomers are sparingly soluble in the solvent. More particularly, a liquid isomeric mixture of ortho-, meta- and para-chloronitrobenzene containing a major amount of meta-chloronitrobenzene is dispersed in a lower alkylene glycol solvent that is at a temperature below the melting point of meta-chloronitrobenzene. A finely divided solid is collected, for example, by filtration, to provide a product enriched in meta-chloronitrobenzene.

Purification of meta-chloronitrobenzene

Aqueous hydrogen peroxide solutions are stabilized with the use of phosphorous triamides and phosphoric triamides such as hexamethylphosphorous triamide, hexamethylphosphoric triamide, and bis(dimethylamino)morpholinophosphorus oxide, preferably in combination with known stabilizer additives, i.e., stannates, nitrates, and pyrophosphates.

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Barberton, OH, United States of America

James A Cook, Jr