Copolyimide membranes with high permeability and selectivity for olefin/paraffin separations
US9327248B1 · kind B1 · utility
3Cited by
8References
2Claims
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Key dates
| Filing date | Dec 4, 2014 |
| Grant date | May 3, 2016 |
| Priority date | — |
| Expiry date | Dec 4, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2053/224
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A copolyimide polymer membrane is provided for separation of hydrocarbons including separation of olefins from paraffins and isoparaffins from other paraffins. The copolyimide polymer membranes include a poly(3,3′-diaminobenzophenone-3,3′,5,5′-tetramethyl-4,4′-methylene dianiline-pyromellitic dianhydride) (abbreviated as poly(DAB-TMMDA-PMDA)). The copolyimide membranes prepared from poly(DAB-TMMDA-PMDA) with varying molar ratios of DAB to TMMDA (abbreviated as PI-DAB-T) showed excellent separation properties for propylene/propane separation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.