Regenerating of acids, particularly of strong organic acids, using bipolar membranes
US5993629A · kind A · utility
2Cited by
4References
10Claims
0Family size
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Key dates
| Filing date | Jul 17, 1997 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Jul 17, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C303/44
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An electrodialysis method using a bipolar membrane (BP) for regenerating acids, wherein a series of base (B), acid (A) and salt (S) compartments are provided between a positive electrode (anode) and a negative electrode (cathode), said compartments being defined by a series of membranes: cationic, bipolar, anionic, cationic, bipolar and so forth, and a solution being circulated through each compartment. An additional anionic membrane (10) is applied to the anionic side (11) of the bipolar membrane (BP) with no discernible gap therebetween so that contamination of the acid compartment by cations is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.