Supported liquid membrane process for chromium removal and recovery
US6171563A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 21, 1999 |
| Grant date | Jan 9, 2001 |
| Priority date | — |
| Expiry date | Jan 21, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention is directed toward a two-step process for the removal and recovery of chromium from a feed solution, such as waste water, using supported liquid membranes (SLMs). In the first step of the process, the feed solution, which contains hexavalent chromium, is treated with a first strip solution to produce a moderately concentrated Cr(VI) solution. In the second step, the moderately concentrated Cr(VI) solution is treated with a second strip solution. The process advantageously produces a treated feed solution having a decreased concentration of chromium which is acceptable for discharge or recycle and a product solution which contains a highly concentrated Cr(VI) solution having little or no sulfate contaminants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.