Transition metal containing carbon molecular sieve membranes and method to make them
US11471824B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 25, 2017 |
| Grant date | Oct 18, 2022 |
| Priority date | — |
| Expiry date | Dec 9, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02C20/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A carbon molecular sieve (CMS) membrane having improved separation characteristics for separating olefins from their corresponding paraffins is comprised of carbon with at most trace amounts of sulfur and a transition metal, wherein the transition metal is one or more of a group 4-10 and 12 transition metal. The CMS membrane may be made by pyrolyzing a precursor polymer devoid of sulfur in which the precursor polymer has had a transition metal incorporated into it. The pyrolyzing for the precursor having the transition metal incorporated into it is performed in a nonoxidizing atmosphere and at a heating rate and temperature such that the metal has a valence greater than zero (i.e., not metal bonded) to a valence desirably closer to its maximum valence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.