Process for removing toxicants from aqueous petroleum waste streams
US5236594A · kind A · utility
7Cited by
5References
27Claims
0Family size
Inventors
Key dates
| Filing date | Feb 12, 1992 |
| Grant date | Aug 17, 1993 |
| Priority date | — |
| Expiry date | Feb 12, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/255
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Specific toxicants are selectively removed from aqueous waste streams associated with the production of petroleum and petroleum products by contacting such aqueous waste streams with a non-ionic macroreticular polymeric resin having a low to intermediate surface polarity. The toxicants are a group of structurally-related organic molecules containing at least one carboxylic acid group and having a molecular weight in the range of about 200 to about 400. These molecules are toxic to certain indicator species of fish at concentrations of less than 10 parts per billion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.