Removal of hydrogen cyanide from acidic gases
US3935188A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1973 |
| Grant date | Jan 27, 1976 |
| Priority date | — |
| Expiry date | Dec 10, 1993 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/54
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In a process for the removal of hydrogen cyanide from raw gases containing at least one other acidic component selected from the group consisting of hydrogen sulfide, carbonyl sulfide and mixtures thereof comprising scrubbing said other components from the gases with a scrubbing agent, regenerating resultant loaded scrubbing agent, and recycling resultant regenerated scrubbing agent to the scrubbing step, PA1 The improvement wherein the hydrogen cyanide is scrubbed out simultaneously with the other acidic components, resultant loaded scrubbing agent is mixed with an aqueous alkali metal or alkaline earth hydroxide solution, and the thus-formed cyanide salt solution is thermally converted into ammonia and formate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.