Rohm and Haas Company

Rita K Upmacis

William Bauer, Jr

Robert Michael Mason

Timothy Allen Hale

Samuel F Reed, Jr

Nelson I Quiros

A continuous process for producing a pure grade of acrylic acid having residual aldehyde levels under 10 parts per million. The process applies two groups of amines sequentially and continuously in selectively reducing acrolein and furfural and may be advantageously conducted in the presence of maleic acid and maleic anhydride impurities.

Process for pure grade acrylic acid

The invention provides a continuous process for producing a pure grade of acrylic acid having residual aldehyde levels under 10 parts per million. The process applies two groups of amines sequentially and continuously in selectively reducing acrolein and furfural and may be advantageously conducted in the presence of maleic acid and maleic anhydride impurities.

Process for grade acrylic acid

A process for the preparation of an .alpha.,.beta.-unsaturated C.sub.3 -C.sub.6 carboxylic acid of greater than 98% purity, which combines fractional distillation and melt crystallization procedures.

Process for purifying unsaturated carboxylic acids using distillation

This invention is a method for removing certain carbonyl containing impurities from .alpha.,.beta.-unsaturated carboxylic acid ester with an aqueous solution of a bisulfite or dithionite salt.

Removal of carbonyl impurities from .alpha..beta. unsaturated carboxylic

Disclosed are salts of N-nitrosophenylhydroxylamine and their use as polymerization inhibitors.

Salts of N-nitrosophenylhydroxylamine

Disclosed are salts of N-nitrosophenylhydroxylamine and their use as polymerization inhbitors.

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North Wales, PA, United States of America

Rita K Upmacis