Process for desulfurizing waste gases
US4836992A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1987 |
| Grant date | Jun 6, 1989 |
| Priority date | — |
| Expiry date | Apr 27, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25B1/22
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for desulfurizing waste gas is described, wherein an SO.sub.2 containing waste gas is absorbed in an aqueous solution and the resultant solution containing sulfite is treated electrolytically which is much less expensive than the prior art methods, is simpler to implement and avoids the danger of producing explosive gases which is possible in prior art methods based on anodic O.sub.2 formation and cathodic H.sub.2 formation. In this process, electrochemical oxidation of SO.sub.3.sup.2- ions into SO.sub.4.sup.2- ions occurs at the anode as well as a simultaneous formation of H.sup.+ ions, thereby producing H.sub.2 SO.sub.4, while avoiding the production of oxygen. Apparatus suitable for carrying out this process is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.