Gas dehydration membrane with low oxygen and nitrogen permeability
US6083297A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1997 |
| Grant date | Jul 4, 2000 |
| Priority date | — |
| Expiry date | Sep 24, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/268
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a gas dehydration membrane comprising a membrane having pores communicating between a first and an opposing second surface of the membrane and further having an average pore diameter on the first surface of the membrane which is about 10 to 1000 times smaller than that on the opposing second surface of the membrane. The invention further relates to a process for dehydrating a gaseous feedstock comprising passing the gaseous feedstock over a membrane characterized by high surface porosity wherein pore openings on a first surface thereof are at least 10 to 1000 times smaller than pore openings on an opposing surface thereof and wherein from about 2% to about 30% of the pore volume is occupied by a humectant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.