Process for the production of solvent stable polymeric membranes
US10913033B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2017 |
| Grant date | Feb 9, 2021 |
| Priority date | — |
| Expiry date | Oct 8, 2037 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/30
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to a process for preparing an asymmetric integrally skinned membrane for the separation of at least one solute from a solution, comprising the steps of: (a) preparing a polybenzimidazole dope solution comprising: (i) a polybenzimidazole polymer, and (ii) a solvent system for said polybenzimidazole which is water miscible; (b) casting a film of said dope solution onto a support; (c) immersing the film cast on the support into a coagulating medium to form an asymmetric integrally skinned membrane; (d) treating the membrane from step (c) with a cross-linking agent; (e) treating the membrane from step (d) with a cross-link modification agent. Further aspects relate to an asymmetric integrally skinned membrane and uses thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.