Membrane nitrogen rejection process and system
US11491440B2 · kind B2 · utility
0Cited by
8References
12Claims
0Family size
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Key dates
| Filing date | Dec 3, 2019 |
| Grant date | Nov 8, 2022 |
| Priority date | — |
| Expiry date | Feb 13, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10L2290/548
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A feed containing methane and nitrogen gas is processed in a three-stage membrane system, each stage of which is selective for methane over nitrogen. The methane enriched permeate from the first stage is removed as product gas. The methane-depleted residue from the second stage is purified in second and third cascaded stages to provide second and third permeates and second and third residues. The third stage permeate is recycled to the feed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.