Continuous catalyzed vapor phase dimeric cyclic ester process
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United States of America Patent
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Aug 11, 1992
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N/A
app pub date -
Jun 28, 1990
filing date -
Jun 28, 1990
priority date (Note) -
Expired
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Abstract
A continuous catalyzed vapor phase process for the production of dimeric cyclic esters which comprises converting the corresponding alpha-hydroxy-carboxylic acid or ester in the vapor phase over a solid catalyst, such as a silica-alumina, preferably a silica-alumina having a high silica content, in the presence of a carrier of gas.
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