Rohm and Haas Company

Dow Global Technolgoies LLC

Mingyu Ye

Philippe P Maillot

Joy L Mendoza

Stacy W Hoy, Iv

David Flosser

Alejandro Ceron

Nawal K Sharma

Alan E Sopchik

Joseph Atkins

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

Fouling of an MMA process is reduced by strategically removing an aqueous slip stream.

Reduced fouling process for the production of methyl methacrylate

Fouling of an MMA process is reduced by acidifying a stream comprising recycled components.

A transesterification process produces a (meth)acrylate ester product from a mixture comprising an alkyl(meth)acrylate reactant, an alcohol reactant, a catalyst, and a polymerization inhibitor. The mixture is subjected to reaction conditions sufficient to produce a product (meth)acrylate and a product alcohol, which are different than the reactants.

Transesterification process

A transesterification process produces a (meth)acrylate ester product from a mixture comprising an alkyl(meth)acrylate reactant, an alcohol reactant, a catalyst, and a polymerization inhibitor, wherein the water content in the reaction zone at the start of the transesterification step is from 0.2 to 1.1 weight percent, based on the weight of the materials in the reaction zone. The mixture is subjected to reaction conditions sufficient to produce a product (meth)acrylate and a product alcohol, which are different than the reactants.

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Deer Park, TX, United States of America

Mingyu Ye