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:
Apr. 09, 2019
Filed:
Oct. 11, 2016
Korea Research Institute of Chemical Technology, Daejeon, KR;
Dong Won Hwang, Daejeon, KR;
Jong San Chang, Daejeon, KR;
Young Kyu Hwang, Daejeon, KR;
U Hwang Lee, Daejeon, KR;
Do Young Hong, Gyeonggi-do, KR;
Su Kyung Lee, Daejeon, KR;
Kyung Ho Cho, Gyeonggi-do, KR;
Pravin Pandharinath Upare, Daejeon, KR;
KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGY, Daejeon, KR;
Abstract
The present invention relates to a method and apparatus for preparation of lactide using a lactide purification process, comprising introducing an aqueous solution comprising lactic acid into a reactor filled with a catalyst and reacting the same to produce crude lactide vapor; and purifying the crude lactide vapor to produce lactide crystals, wherein a first purification comprises collecting and crystallizing the crude lactide vapor using a first solvent to produce lactide crystals, and separating the lactide crystal from a residue through filtration.