Process for the production of methacrylic acid
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United States of America Patent
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Oct 11, 2016
Grant Date -
Jul 21, 2016
app pub date -
Aug 26, 2014
filing date -
Aug 26, 2013
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Abstract
Disclosed is a method of making methacrylic acid, or a carboxylic derivative thereof, from itaconic acid, isomers, or precursors thereof. A starting material comprising an acid selected from the group consisting of itaconic acid, citraconic acid, mesaconic acid, citric acid, aconitic acid, isocitric acid and mixtures thereof, is subjected to contact with 0.1 eq. to 3.0 eq. of a base, at a temperature of 150° C. to 350° C., under the influence of a transition metal-containing heterogeneous catalyst. A better yield at lower temperatures is achieved.
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