Acid resistant PBI membrane for pervaporation dehydration of acidic solvents
US9283523B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 2012 |
| Grant date | Mar 15, 2016 |
| Priority date | — |
| Expiry date | Oct 25, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/30
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A pervaporation membrane may be an acid-resistant polybenzidimazole (PBI) membrane. The acid-resistant PBI membrane may be a PBI membrane chemically modified by a process selected from the group consisting of sulfonation, phosphonation, cross-linking, N-substitution, and/or combinations thereof. The membrane may be thermally stabilized. A method for the dehydration of an acid material may include the steps of: contacting an acidic aqueous solution with a membrane of an acid-resistant polybenzidimazole; taking away a permeate stream rich in water; and taking away a concentrate steam rich in the acid material. The acidic aqueous solution may be acetic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.