Ultrathin ethylcellulose/poly(4-methylpentene-1) permselective membranes
US4871378A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1987 |
| Grant date | Oct 3, 1989 |
| Priority date | — |
| Expiry date | Dec 11, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D69/1216
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An ultrathin, permselective membrane for use in gas or vapor separations. The membrane comprises a permselective layer of ethylcellulose in combination with one or more permselective layers of poly(4-methylpentene-1). The permselective membrane is preferably coated onto a microporous substrate, such as an asymmetric Loeb-Sourirajan type membrane. The resulting membrane has high gas fluxes and selectivities, and can be used, for example, to separate oxygen and nitrogen; hydrogen sulfide from nitrogen, methane or carbon dioxide; hydrogen from nitrogen; sulfur dioxide or ammonia from nitrogen; or water vapor from air. A method of preparing such a membrane is also provided, as is a gas separation process using the membrane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.