Stripping steam recycle for solvent recovery processes
US4334983A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1980 |
| Grant date | Jun 15, 1982 |
| Priority date | — |
| Expiry date | Jun 30, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G21/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
It has been discovered that extraction processes which employ solvents to separate components from a feed stream and which solvents are themselves recovered by stripping from the thus produced extract or raffinate or both are improved in that the solvent is stripped from the extract, raffinate or both by the use of steam which has been previously distilled from a major portion of the process stream in one of the initial stages of the solvent recovery process, which steam rather than being vented or condensed for disposal is employed as a replacement for specifically generated fresh steam. This recycle steam is employed to strip any residual solvent from the extract, the raffinate or both. The steam and any residual solvent thus stripped is recycled from the extract stripper, raffinate stripper or both to the input feed of the solvent recovery train. This invention has application to any solvent extraction process employing solvent recovery wherein the solvent used in the process does not form an azeotrope with water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.