Integrated process for the manufacture of lactide
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United States of America Patent
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May 28, 1996
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app pub date -
Aug 18, 1994
filing date -
Aug 18, 1994
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Abstract
An integrated process for the manufacture of lactide from a solution of lactic acid in de-ionized water comprising the sequential steps: A. Dehydrating the aqueous lactic acid in at least two stages to effect condensation polymerization of the lactic acid and the formation of oligomers in which the average number of monomer units is 8-25, the dehydration stages being conducted in equipment fabricated from low ferrous materials; B. Thermally cracking the oligomers in the presence of depolymerization catalyst to form lactide vapor of which the average residence time within the cracking zone is less than 15 seconds; C. Condensing the lactide vapor and fractionally distilling the condensate to remove concentrated lactide as a liquid sidestream; and D. Subjecting the concentrated lactide sidestream to melt crystallization to separate purified lactide having an Acidity Potential less than 6.
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