Carbon molecular sieve membranes containing a group 13 metal and method to make them
US11504675B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 8, 2018 |
| Grant date | Nov 22, 2022 |
| Priority date | — |
| Expiry date | Jun 8, 2038 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/50
- 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 group 13 metal. The CMS membrane may be made by pyrolyzing a precursor polymer devoid of sulfur in which the precursor polymer has had a group 13 metal incorporated into it, wherein the metal is in a reduced state. The pyrolyzing for the precursor having the group 13 metal incorporated into it is performed in a nonoxidizing atmosphere and at a heating rate and temperature such that the metal in a reduced state (e.g., covalently bonded to carbon or nitrogen or in the metal state).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.