METHOD AND DEVICE FOR MANUFACTURING LACTIDE

A method and a device for manufacturing lactide, whereby crude lactide, being prepared by means of depolymerization of lactic acid oligomers, is purified by means of a distillation step. The prepared crude lactide is maintained for a period of at least 5 hours in a reaction vessel at a temperature b...

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Bibliographic Details
Main Authors DE HAAN, Andre Banier, CAVACO MORAO, Ana Isabel, DE VRIES, Johannes Jeichienus
Format Patent
LanguageEnglish
Hungarian
Published 28.09.2021
Subjects
CHEMISTRY
HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
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Summary:A method and a device for manufacturing lactide, whereby crude lactide, being prepared by means of depolymerization of lactic acid oligomers, is purified by means of a distillation step. The prepared crude lactide is maintained for a period of at least 5 hours in a reaction vessel at a temperature between 97° C. and 200° C. prior to the distillation step. Keeping the lactide during a period of time in a reaction vessel leads to a decrease of the lactic acid content and an increase of the lactic acid oligomer concentration, so that the resulting crude lactide can be more efficiently purified during subsequent distillation. A pre-distilling step gives additional advantages.
Bibliography:Application Number: HUE16719083