Rohm and Haas Company

Dow Global Technolgoies LLC

Alan E Sopchik

Michael Stanley DeCourcy

Stephen Todd Cohn

Abraham Benderly

Joy L Mendoza

William G Worley

Philippe P Maillot

Mingyu Ye

Rajesh Shah

Joseph Atkins

A process for recovering methacrolein and methanol from methacrolein dimethyl acetal. The method comprises a step of contacting a mixture comprising methyl methacrylate and methacrolein dimethyl acetal with a strong acid ion exchange resin in the presence of water. The mixture comprises no more than 0.2 wt % sodium methacrylate.

Method for recovery of methacrolein and methanol from methacrolein dimethylacetal

The present invention provides methods comprising washing or, preferably, washing and neutralizing a sulfur acid containing crude MMA stream to generate a two phase stream containing at least methacrylic acid, methacrylamide (MAM), water and methanol, and an organic component containing methyl methacrylate and thereby form an aqueous component; including in any of the organic component, the aqueous component of a neutralized sulfur acid containing crude methyl methacrylate (MMA) stream or the organic component of a neutralized sulfur acid containing crude methyl methacrylate (MMA) stream one or more N-oxyl compound polymerization inhibitor; followed by separating the aqueous component from the organic component, thereby forming a treated crude MMA stream and an aqueous stream to remove residual (meth) acrylic acid.

Methods of using N-oxyl polymerization inhibitor in a wash settler for preparing methyl methacrylate

A process for producing a grade of (meth)acrylic acid having residual formaldehyde levels of under 100 parts per million.

Process for purifying (meth)acrylic acid

A method is provided herein for purifying (meth)acrylic acid to provide a purified (meth)acrylic acid product having a low aldehyde concentration and not more than 0.2 wt % water. One embodiment of the method includes distilling (meth)acrylic acid in the presence of an aldehyde treating compound. Another embodiment of the method includes also distilling crude (meth)acrylic acid in the presence of a reactive drying agent. (Meth)acrylic acid produced in this manner is especially suitable for use in specialty (meth)acrylic acid polymers, such as for example superabsorbent polymers, binders, and ethylene-(M)AA copolymers.

Process for manufacturing reduced water content (meth)acrylic acid

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Seabrook, TX, United States of America

Alan E Sopchik