Title:
【発明の名称】テレフタル酸ジメチルからのシクロヘキサンジメタノールの分離方法
Document Type and Number:
Japanese Patent JPH09504025
Kind Code:
A
Abstract:
Provided is a method useful for separating and removing impurities such as cyclohexane dimethanol (CHDM) and other additives from their mixture with dimethylterehthalate (DMT), formed during a depolymerization process such as methanolysis of poly(ethyene terephthalate) (PET), poly(cyclohexyldimethylene terephthalate) (PCT), or copolyers of PET and PCT. The separation and removal of CHDM is accomplished via either melt or solution crystallization of the DMT following excess methanol removal (via distillation) of the methanolysis reactor products.
Inventors:
Haze, william herbert
Folk, daniel paul
Yau, Chuk Chun
Sink, chester wayne
Folk, daniel paul
Yau, Chuk Chun
Sink, chester wayne
Application Number:
JP51196395A
Publication Date:
April 22, 1997
Filing Date:
October 11, 1994
Export Citation:
Assignee:
Eastman Chemical Company
International Classes:
A61B17/70; A61B17/80; C07C67/03; A61B17/56; C07C67/475; C07C67/52; C07C67/54; C07C69/82; A61B17/86; (IPC1-7): C07C69/82; C07C67/475; C07C67/52; C07C67/54
Attorney, Agent or Firm:
Takashi Ishida (2 outside)