Use of helium and argon diluent gases in modification of carbon molecular sieves
US5086033A · kind A · utility
21Cited by
5References
10Claims
0Family size
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Key dates
| Filing date | Jan 3, 1991 |
| Grant date | Feb 4, 1992 |
| Priority date | — |
| Expiry date | Jan 3, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02C20/40
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Carbon molecular sieves, useful in the separation of air into oxygen and nitrogen, are improved through modification of the micropores of the sieve by contact with the pyrolysis products of a carbon-containing compound in the gaseous state diluted with helium, with or without nitrogen as a part of the diluting gas. Volatile organic compounds, such as trimethylcyclohexane, are used with the diluent gas to narrow the micropore openings of a carbon molecular sieve and increase its kinetic selectivity for oxygen adsorption. Carbon dioxide and helium or argon in the diluent gas are used to open pores available to contacting gases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.