Solid-phase polycondensation of polyester with process gas purification
US7819942B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2005 |
| Grant date | Oct 26, 2010 |
| Priority date | — |
| Expiry date | Dec 12, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29B2009/165
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a method for producing a high-molecular polyester from a solidified polyester prepolymer by solid phase polycondensation. The polycondensation cleavage products of the solid phase polycondensation reaction are extracted from the product by means of a process gas, and the process gas is then cleaned and essentially recycled. According to the invention, the process gas is cleaned by means of an aqueous washing liquid. The invention also relates to an installation for carrying out the inventive method, said installation containing a crystallisation appliance (1) and a reaction appliance (2). A gas outlet (2d) of the reaction appliance (2) is directly or indirectly connected to a gas inlet (3c) in a gas cleaning system (3), and a gas outlet (3d) of the gas cleaning system (3) is connected to a gas inlet (2c) of the reaction appliance (2). Furthermore, the gas cleaning system (3) comprises a gas washing appliance to which an aqueous washing liquid is supplied, and a gas drying appliance (4) which is mounted downstream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.