Rohm and Haas Company

Dow Global Technolgoies LLC

Sarah L Hruby

Muhunthan Sathiosatham

Mark A Silvano

Reetam Chakrabarti

Minh N Ngo

Leonard Edward Bogan, Jr

Sanjib Biswas

Dmitry A Krapchetov

Andrew Michael Lemonds

Allen S Bulick

Dmitri A Kraptchetov

Raymond P Roach

Robert Tengler

Sarah M Hoyt

Dmitri A Krapchetov

David C Decoster

Charles Como

Provided is a process for preparing dry methacrolein which maximizes capture of methanol. Also provided is a process for producing methyl methacrylate.

Process for preparing methacrolein

The present invention is a process for converting a phosphonate to a hydroxyalkyl phosphonic acid comprising the step of contacting together water, the phosphonate, and a sulfonated or phosphonated heterogeneous catalyst under conditions sufficient to convert at least 50% of the phosphonate to the hydroxyalkyl phosphonic acid. The process of the present invention provides a way of preparing hydroxyalkyl phosphonic acids safely and economically, without corrosive effects.

Preparation of a hydroxyalkyl phosphonic acid

Hydroxycarboxylic acids, e.g., 3-hydroxypropionic acid, and/or their ammonium salts are dehydrated to their corresponding unsaturated carboxylic acids, e.g., acrylic acid, by a process that uses a catalyst comprising ammonium bisulfate. The use of ammonium bisulfate reduces or eliminates the problems associated with processes that use sulfuric acid as a dehydrating catalyst, e.g, excess sulfuric acid consumption and/or recovery.

Ammonium bisulfate catalyzed dehydration of beta-hydroxy acids

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Kristianstad, Sweden

Sarah L Hruby