Process for the dehalogenation of chloroacetic and bromoacetic acid
US4707226A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 5, 1987 |
| Grant date | Nov 17, 1987 |
| Priority date | — |
| Expiry date | Mar 5, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25B3/25
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Chloroacetic and bromoacetic acids are dehalogenated by electrolysis of aqueous solutions of these acids using carbon cathodes and anodes likewise of carbon or of other conventional electrode materials in undivided or in divided electrolysis cells; the aqueous electrolysis solutions in the undivided cells and in the cathode area of the divided cells contain, in dissolved form, one or more salts of metals having a hydrogen excess-voltage of at least 0.4 V (at a current density of 4,000 A/m.sup.2). Metals having a hydrogen excess-voltage of at least 0.4 V (at a current density of 4,000 A/m.sup.2) are, for example, Cu, Ag, Au, Zn, Cd, Hg, Sn, Pb, Ti, Zr, Bi, V, Ta, Cr and Ni. The process allows high current densities (up to about 8,000 A/m.sup.2) to be used without or virtually without corrosion of the electrodes and without deposit formation on the electrodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.