Closed loop process for producing chlorine from hydrogen chloride
US6355223B1 · kind B1 · utility
0Cited by
9References
13Claims
0Family size
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Key dates
| Filing date | Dec 30, 1999 |
| Grant date | Mar 12, 2002 |
| Priority date | — |
| Expiry date | Dec 30, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for oxidizing HCl to produce pure chlorine gas by reacting HCl with a mixture of sulfuric and nitric acids. Chlorine gas is evolved. Spent nitric and sulfuric acids are first regenerated by contact with air or oxygen. After regeneration, the entire stream of regenerated acid, or major portion thereof, is reconcentrated. The concentration of sulfuric acid occurs at lower strengths (60%-80%) and temperatures. The concentrated acid may be used to oxidize more HCl. Heat evolved by the regeneration of the spent acids is carried into the acid concentration stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.