Ptt Global Chemical Public Company Limited

Yu Noda

Yuriy Roman-Leshkov

Ramnik Singh

Cenan Ozmeral

Rajesh Dasari

Robert M Rioux

Described herein are solid acid catalysts and the methods for catalytically preparing &#x3b1;,&#x3b2;-unsaturated carboxylic acids and/or esters thereof. In one aspect, a zeolite catalyst may be used. The catalyst may, in certain embodiments, be modified to improve the selectivity and/or conversion of a reaction. For instance, a catalyst may be modified by ion exchange to achieve a desirable acidity profile in order to achieve high level of conversion of reactants and selectivity for desirable products of the catalytic reaction. In another aspect, a variety of feed stocks (e.g., starting compositions) may be used including an &#x3b1;-hydroxycarboxylic acid, an &#x3b1;-hydroxycarboxylic acid ester, a &#x3b2;-hydroxycarboxylic acid, a &#x3b2;-hydroxycarboxylic acid ester, cyclic esters thereof (e.g., lactide), and combinations thereof.

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Prague, Czechia

Yu Noda