Patent ID: 8519185
Filing Date: 2013-08-27
Classification: B01D,C07C,C08G,C12P,Y02A

Abstract:
1. A process for producing polyglycolic acid comprising: producing glycolic acid from glycolate and producing polyglycolic acid from the glycolic acid as a raw material by a polymerization method, wherein the process for producing glycolic acid from glycolate comprises: a first step for carrying out the following step(s) (a1) and/or (c) for a solution containing glycolate; a second step for carrying out the following step (a2) after said first step to transform the glycolate into glycolic acid; and a third step for carrying out the following step(s) (b) and/or (d) after said second step, (a1) step for electrodialyzinq with an anion exchange membrane and a cation exchange membrane; (a2) step for water-splitting electrodialysis; (b) step for cooling crystallization; (c) step for treatment with an activated carbon; and (d) step for treatment with a cation exchange resin, and wherein said polymerization method includes: producing a oligomer by dehydrating the glycolic acid; carrying out solid polymerization of the oligomer.