Inorganic dual-layer microporous supported membranes
US6536604B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Jun 22, 2000 |
| Grant date | Mar 25, 2003 |
| Priority date | — |
| Expiry date | Jun 22, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention provides for a dual-layer inorganic microporous membrane capable of molecular sieving, and methods for production of the membranes. The inorganic microporous supported membrane includes a porous substrate which supports a first inorganic porous membrane having an average pore size of less than about 25 å and a second inorganic porous membrane coating the first inorganic membrane having an average pore size of less than about 6 å. The dual-layered membrane is produced by contacting the porous substrate with a surfactant-template polymeric sol, resulting in a surfactant sol coated membrane support. The surfactant sol coated membrane support is dried, producing a surfactant-templated polymer-coated substrate which is calcined to produce an intermediate layer surfactant-templated membrane. The intermediate layer surfactant-templated membrane is then contacted with a second polymeric sol producing a polymeric sol coated substrate which is dried producing an inorganic polymeric coated substrate. The inorganic polymeric coated substrate is then calcined producing an inorganic dual-layered microporous supported membrane in accordance with the present inven…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.