Acid resistant PBI membrane for pervaporation dehydration of acidic solvents
USRE46720E1 · kind E1 · reissue
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2016 |
| Grant date | Feb 20, 2018 |
| Priority date | — |
| Expiry date | Jul 18, 2036 |
Classification
- Technology area (CPC —)General
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.