Procedure for the preparation of microporous ceramic membranes for the separation of gas and liquid mixtures
US5250184A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 13, 1992 |
| Grant date | Oct 5, 1993 |
| Priority date | — |
| Expiry date | May 13, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249978
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Microporous membranes for the separation of gas and liquid mixtures. The new membranes show a temperature stability up to 500.degree. C. and a gas separation with separation factors better than the Knudsen limit. Continuous microporous inorganic membranes of any desirable thickness can be prepared by e-beam evaporation of metal oxides on a support membrane, which has substantially larger pores than the metal oxide membrane. It is advantageous when the support membrane consists of the same material as the microporous membrane. The membranes are of porous structure with a narrow pore size distribution of pores, where the majority of the pores have diameters smaller than 1 nm. The membranes can be used in all areas of gas and liquid separation, where the selective separation of smaller molecules from mixtures is desired (f.e. gas concentration by removal of water from natural gas, hydrogen from synthesis gas); for the concentration of aqueous solutions (fruit juices with retention of aroma compounds, vitamins and other compounds important for the flavor and nutritional value of the juice; biological liquids like lymphe, blood, or others with retention of valuable compounds including s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.