Dow Global Technolgoies LLC

Rohm and Haas Company

D Wayne Blaylock

Daniel A Hickman

Kirk Walton Limbach

Jeffrey A Herron

Victor J Sussman

Dmitry A Krapchetov

Wen-Sheng Lee

Daniel J Arriola

Christopher D Frick

Dmitri A Kraptchetov

Kurt D Olson

Kurt W Olson

A method for preparing methyl methacrylate from methacrolein and methanol. The method comprises contacting a mixture comprising methacrolein, methanol and oxygen with a heterogeneous catalyst comprising a support and a noble metal, wherein oxygen concentration at a reactor outlet is from 1 to 7.5 mol % and wherein pH at a reactor outlet is no greater than 7.5.

Method for production of methyl methacrylate by oxidative esterification using a heterogeneous catalyst

A method for preparing methyl methacrylate from methacrolein and methanol. The method comprises contacting a mixture comprising methacrolein, methanol and oxygen with a heterogeneous catalyst comprising a support and a noble metal, wherein said catalyst has an average diameter of at least 200 microns and at least 90 wt % of the noble metal is in the outer 70% of catalyst volume, and wherein oxygen concentration at a reactor outlet is from 0.5 to 7.5 mol %.

A method for preparing methyl methacrylate from methacrolein and methanol. The method comprises contacting in a tubular reactor having at least four zones a mixture comprising methacrolein, methanol, oxygen and a base with a catalyst bed of heterogeneous catalyst comprising a support and a noble metal, wherein reaction zones comprising catalyst beds alternate with mixing zones not comprising catalyst beds.

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Fort Bend, TX, United States of America

D Wayne Blaylock