Method for obtaining lactide
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United States of America Patent
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Nov 26, 2013
Grant Date -
Jun 30, 2011
app pub date -
Dec 19, 2008
filing date -
Dec 19, 2007
priority date (Note) -
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Abstract
Processes for producing lactide from lactic acid oligomers are described herein. The processes generally include heating a lactic acid oligomer in the presence of a catalyst at a temperature of between 150° C. and 300° C. under a pressure of less than 0.01 MPa to form a lactide; distilling the lactide; and condensing and recovering the lactide, wherein the catalyst is a metal salt of the phosphite anion PO33− in which the metal is selected from the group consisting of tin, aluminum, zinc, titanium and zirconium.
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