Process for brine membrane cell operation with external caustic and NaCl concentration control
US4056448A · kind A · utility
4Cited by
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3Claims
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Key dates
| Filing date | Dec 17, 1976 |
| Grant date | Nov 1, 1977 |
| Priority date | — |
| Expiry date | Dec 17, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25B1/46
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Optimum current efficiencies are attained and maintained in a membrane chlor-alkali electrolytic cell by the constant, precise control of both the brine and caustic concentrations at each membrane phase boundary. Such control requires recycling through external holding tanks wherein the concentrations are adjusted to 560 grams per liter caustic and 190 grams per liter brine. Turbulent flow of such concentrations in the cells helps maintain the optimum concentration and also decreases the diffusion layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.