Process and apparatus for purification of a stream containing a cyclic ester of an alpha-hydroxycarboxylic acid

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United States of America Patent

PATENT NO 10058795
APP PUB NO 20160024043A1
SERIAL NO

14773697

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Abstract

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The invention relates to a process for purification of a stream containing a cyclic ester of an alpha-hydroxycarboxylic acid of formula (I), wherein each R independently represents hydrogen or an aliphatic hydrocarbon having 1 to 6 carbon atoms comprising the steps of: (a) separating the cyclic ester-containing stream into one or more cyclic ester-containing vapor fractions and one or more cyclic ester-containing liquid fractions; (b) condensing a cyclic ester-containing vaporized fraction as obtained in step (a) to obtain a cyclic ester-containing condensate; (c) subjecting at least part of the cyclic ester-containing condensate as obtained in step (b) to melt crystallization to obtain a purified cyclic ester-containing stream and a residue stream; and (d) recovering the purified cyclic ester-containing stream as obtained in step (c). The invention further relates to an apparatus suitable for carrying out the present process.

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Patent Owner(s)

  • SULZER CHEMTECH AG; FUTERRO S.A.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Coszach, Philippe Courcelles, BE 20 92
Fässler, Peter Allschwil, CH 1 2
Stepanski, Manfred Buchs, CH 18 36

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