Search International and National Patent Collections

1. (WO2013159347) METHOD FOR CONTINUOUSLY PRODUCING HIGH-CONTENT HIGH-OPTICAL-PURITY LACTATE

Pub. No.:    WO/2013/159347    International Application No.:    PCT/CN2012/074847
Publication Date: Fri Nov 01 00:59:59 CET 2013 International Filing Date: Sat Apr 28 01:59:59 CEST 2012
IPC: C07C 67/03
C07C 69/68
Applicants: XIAOGAN ESUN NEW MATERIAL CO., LTD.
孝感市易生新材料有限公司
YANG, Yihu
杨义浒
XU, Jie
徐杰
Inventors: YANG, Yihu
杨义浒
XU, Jie
徐杰
Title: METHOD FOR CONTINUOUSLY PRODUCING HIGH-CONTENT HIGH-OPTICAL-PURITY LACTATE
Abstract:
A continuous method for directly producing lactate through an ester exchange reaction. The method comprises the steps of: adding catalyst in lactic acid to allow for polycondensation so as to obtain lactic acid oligomer having a molecular weight of 1000-2500; adding catalyst into the lactic acid oligomer to allow for depolymerization so as to obtain crude lactide; and refining the crude lactide, and subjecting the refined lactide and organic alcohol to full-reflux reaction to obtain lactate. The method of the present invention is simple in process, easy to perform, and suitable for industrial production and application. The materials can all be utilized. No "three wastes" emission occurs. Content of the synthesized lactate of the present invention is more than 99.5%, and optical purity of the lactate can reach more than 99%.