The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 17, 2018
Filed:
Apr. 28, 2016
Purac Biochem Bv, Gorinchem, NL;
Johannes Jeichienus De Vries, Gorinchem, NL;
Ana Isabel Cavaco Morao, Gorinchem, NL;
Andre Banier De Haan, Gorinchem, NL;
PURAC BIOCHEM BV, Gorinchem, NL;
Abstract
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.