Separating membrane of polyion complex
US5393432A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1993 |
| Grant date | Feb 28, 1995 |
| Priority date | — |
| Expiry date | Dec 1, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/80
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
To provide a separating membrane of a polyion complex having excellent separation factor, permeation rate and performance stability and being used in separating a mixture of water and an organic substance in accordance with the separating membrane technology. The separating membrane is a novel one comprising a polyion complex which comprises an ionic combination of an anionic polymer having carboxyl groups with a cationic polymer having divalent piperidinium bases. With respect to the separation characteristics of the separating membrane, a permeation rate is at least 100 g/m.sup.2 .multidot.hr and a separation factor is at least 1,000 in an evaluation according to pervaporation (by reducing the pressure outside the hollow fiber while feeding a 99 wt. % aqueous ethanol solution inside the same at 70.degree. C.). Further, a durability evaluation shows that the permeation rate and separation factor of the separating membrane are respectively 110 g/m.sup.2 .multidot.hr and 1,500 after the lapse of one month, attesting to desirable stability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.