Polymeric microporous separators for use in electrolytic processes and devices
US4250002A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1979 |
| Grant date | Feb 10, 1981 |
| Priority date | — |
| Expiry date | Sep 19, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention disclosed herein relates to a polymeric microporous electrolytic cell separators for producing alkali metal hydroxide at high current efficiencies, said separator having: PA1 a. porosity of at least about 60%; PA1 b. thickness of between 8 and 130 mils; PA1 c. hysteresis of from 0.30 to 0.99 wherein hysteresis is defined as the ratio of the amount of mercury trapped within the pore structure of the separator after release of pressure to 1 psi compared to the amount of mercury present when first subjected to total impregnation by mercury at 50,000 psi, and PA1 d. distribution of pore sizes in a range between 0.004 and 34 microns wherein at least 85% of said pores have a diameter of between 0.12 and 33 microns and at least 60% of said pores have a diameter between 0.59 and 33 microns; wherein the porosity, thickness, hysteresis, and pore size distribution are adapted to provide the separator with the property of exhibiting a high current efficiency including the property of a current efficiency of about 85% to about 98% when measured at a sodium hydroxide concentration of 150 gpl. The separator also possesses hydraulic properties which renders them suitable for use in a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.