process and device for recovering lactide from polylactide or glycolide from polyglycolide

摘要

patent and method for recovering lactide from polylactide or glycolide from polyglycolide. The present invention relates to a process for the recovery of lactide from polylactide (pla) or glycolide from polyglycolide (pga), in which, in a first step, pla or pga is contacted with a medium. hydrolyzant and it is hydrolytically decomposed to form oligomers. In another step, a cyclization depolymerization of the oligomers obtained in the first step to form the lactide or glycolide is performed. furthermore, the present invention relates to a device, which is based on the combination of a hydrolysis device with a depolymerization reactor, with which the process described above can be performed. The core of the process according to the invention is a partial hydrolysis of the polymeric materials originally used in combination with a cyclization depolymerization.