Process for separating cyclohexane dimethanol from dimethyl terephthalate
US5498749A · kind A · utility
27Cited by
12References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1993 |
| Grant date | Mar 12, 1996 |
| Priority date | — |
| Expiry date | Oct 22, 2013 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/8605
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.