Method and plant for producing polycarbonate
US9410015B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 2013 |
| Grant date | Aug 9, 2016 |
| Priority date | — |
| Expiry date | Jun 13, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/24
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to a method for producing a polycarbonate comprising at least the following steps: a) transesterification of one or more bisphenols with one or more diaryl carbonates in at least one transesterification reactor under continuous removal of the hydroxy aryl reaction product released, b) pre-polycondensation of the reaction product of the transesterification in at least one pre-polycondensation reactor under continuous removal of the hydroxy aryl reaction product released, c) polycondensation of the reaction product of the pre-polycondensation in at least one polycondensation reactor, wherein the aryl reaction product is removed during the transesterification reaction and the hydroxy aryl reaction product is removed during the pre-polycondensation reaction through a common column, wherein entrained diaryl carbonate is separated from the hydroxy aryl reaction product drawn off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.