Composite semipermeable membrane
US10974205B2 · kind B2 · utility
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11Claims
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Key dates
| Filing date | Jun 27, 2013 |
| Grant date | Apr 13, 2021 |
| Priority date | — |
| Expiry date | Nov 8, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2103/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A composite semipermeable membrane includes a porous supporting membrane and a separation functional layer, in which, in cross-sections having a length of 2.0 μm in a membrane surface direction, the average number density of projections in the separation functional layer which have a height of one-fifth or more of the 10-point average surface roughness is 10.0-30.0 projections/μm and the projections have an average height less than 100 nm, and in which a water production rate and a salt rejection are predetermined values or more after an aqueous solution is passed through under certain conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.