Process for thermally decomposing chlorides of bivalent or multivalent metals
US4216196A · kind A · utility
4Cited by
9References
4Claims
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Inventor
Key dates
| Filing date | Jul 6, 1978 |
| Grant date | Aug 5, 1980 |
| Priority date | — |
| Expiry date | Jul 6, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/129
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Bivalent or multivalent metal chloride in aqueous solution is decomposed in the presence of oxygen to produce HCl and the corresponding metal oxide. Hydrochloric acid recovered by adiabatic absorption from the decomoposition gas is concentrated by extractive distillation in contact with concentrated metal chloride solution. The resulting solution is concentrated by heat exchange with the hot decomposition gas. At least part of the solution of high concentration is supplied to the thermal decomposition stage at a metal chloride rate corresponding to the metal chloride content of the incoming aqueous liquor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.