Method of removing contaminants from water
US4236973A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 14, 1979 |
| Grant date | Dec 2, 1980 |
| Priority date | — |
| Expiry date | May 14, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2101/38
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Organic material having a normal boiling point in excess of 200.degree. C. and a relative volatility with respect to water of at least one is removed from water contaminated therewith. The process comprises passing a current of vapor, sufficient to vaporize at least a portion of the organic material, through a moving stream of the contaminated water. In a preferred embodiment, the process comprises adjusting the pH of the contaminated water to a level sufficient to prevent substantial dissociation of the organic material. The contaminated water is then countercurrently contacted with a sufficient vapor flow to vaporize at least a portion of the organic material. The resulting organic material-containing vapor can be recovered, and the organic material removed. Illustrative of the process is the removal by air stripping of pentachlorophenol from waste water contaminated with about 250 parts per billion thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.