Rohm and Haas Company

Other

William Bauer, Jr

Rita K Upmacis

Nelson I Quiros

Robert Michael Mason

Timothy Allen Hale

Jeremia Jesaja Venter

Josefina Tseng Chapman

Samuel F Reed, Jr

Mario Giuseppe Luciano Mirabelli

Rita Karina Upmacis

Mario G Mirabelli

Lori Marie Petrovich

Process for producing butyl acrylate

An improved process for producing n-butyl acrylate in high yield and high purity substantially free of acrylic acid, incorporates one or more of the following new process components in an acid-catalyzed esterification process for producing n-butyl acrylate: 1. A hydrolytic recovery component, wherein heavy end adducts produced during the acid-catalyzed esterification are hydrolyzed, recovered, and recycled as valuable reactants from a hydrolytic recovery unit (HRU); 2. A cracking reactor component, preferably used with the HRU, wherein additional valuable reactants are recovered and recycled after treatment in the cracking reactor; and 3. A new distillative component, wherein a crude n-butyl acrylate stream is efficiently distilled in an aqueous mode through an acrylic acid separation column, thereby providing n-butyl acrylate substantially free of acrylic acid and in high yield. The first two components also are applicable to acid-catalyzed processes producing C.sub.1 to C.sub.4 alkyl acrylates. A continuous process producing n-butyl acrylate incorporating all new process components also is disclosed.

An improved process for producing n-butyl acrylate in high yield and high purity substantially free of acrylic acid, incorporates one or more of the following new process components in an acid-catalyzed esterification process for producing n-butyl acrylate:

The invention provides a process for reducing one or more carbonyl impurity present in a monomer of an .alpha.,.beta.-unsaturated carboxylic acid or its alkyl ester by treating the monomer containing the carbonyl impurities with a trialkyl phosphite or a triaryl phosphite.

Reduction of carbonyl impurities in .alpha., .beta.-unsaturated acids

Processes are provided for producing a pure grade of acrylic acid having residual aldehyde levels under 10 parts per million. The processes apply selected groups of amines sequentially and, preferably, continuously in selectively reducing, for example, acrolein and furfural, and may be advantageously conducted in the presence of maleic acid and maleic anhydride impurities.

Process for pure grade acrylic acid

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.

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

This invention provides a method for reducing carbonyl-containing impurities in .alpha.,.beta.-unsaturated carboxylic acid esters by treatment of the ester with one or more of a selected phenylenediamine and an acid.

Process for purifying .alpha.,.beta.-unsaturated esters

A method of reducing the levels of impurities in aqueous monomer solutions is provided. Subjecting aqueous monomer solutions to ultraviolet radiation for from about 2 minutes to about 5 hours, reduces the level of impurities, especially carbonyl-compounds.

Method of reducing impurities in aqueous monomer solutions

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.

The present invention provides a method of reducing the levels of protoanemonin present in aqueous monomer solutions by adding an effective amount of one or more para-phenylenediamines having the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are the same or different radical selected from hydrogen, methyl, ethyl, n-propyl, iso-propyl, phenyl or methoxyphenyl with the proviso that at least one of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is hydrogen; R.sub.5, R.sub.6, R.sub.7 and R.sub.8 are the same or different radical selected from hydrogen, methyl, ethyl, n-propyl, iso-propyl, methoxy or ethoxy with the proviso that at least one of R.sub.5, R.sub.6, R.sub.7 and R.sub.8 is hydrogen; and salts thereof.

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Huntingdon Valley, PA, United States of America

William Bauer, Jr