Method for treating liquid used for absorbing gaseous sulfur dioxide in the process for desulfurization of combustion exhaust gas
US4802966A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1987 |
| Grant date | Feb 7, 1989 |
| Priority date | — |
| Expiry date | Apr 16, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F5/30
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Disclosed herein is a method for treating a liquid used for absorbing gaseous sulfur dioxide in the wet process for desulfurization of a combustion exhaust gas of the gypsum-by-producing type, which method comprises the steps of, after subjecting a liquid, which has been saturated with gypsum, has dissolved at least magnesium sulfate and magnesium chloride and is used as the above-mentioned liquid for absorbing gaseous sulfur dioxide, to clarifying treatment, passing the liquid saturated with gypsum through an electrodialyzer having three dialyzing chambers comprising one sheet of cation-exchange membrane and two sheets of membrane selectively permeable to monovalent anions as one unit, thereby selectively separating and removing the chloride ion in the above-mentioned liquid as an aqueous solution of magnesium chloride of a high concentration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.