Separating vaporous reaction product in the production of polyesters
US4011202A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1975 |
| Grant date | Mar 8, 1977 |
| Priority date | — |
| Expiry date | Feb 27, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S203/16
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for the production of linear fiber-forming polyesters, especially polyethylene terephthalate, wherein vaporous reaction products are separated in an improved manner by suction withdrawal from the polymerization reactor through the action of a fluid vacuum jet or aspirator which is supplied with recirculated glycol vapor as the propellant or jet fluid for the aspirator and also by further suction through the action of a recirculated glycol liquid operating a liquid circulating vacuum pump in a final separation of non-condensable gases such as nitrogen from residual condensable vapors. The process is especially useful in preventing the discharge of the vaporous by-products into the surrounding environment during the production of the polyester product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.