Chemical pre-treatment and biological destruction of propylene carbonate waste streams effluent streams to reduce the biological oxygen demand thereof
US5275734A · kind A · utility
3Cited by
5References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1992 |
| Grant date | Jan 4, 1994 |
| Priority date | — |
| Expiry date | Aug 4, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/908
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Disclosed is a method of treating a process stream from a process producing a non-biodegradable alkylene carbonate stream. The alkylene carbonate is hydrolyzed in a strong, aqueous, alkaline solution to form an aqueous alkaline solution of the corresponding alkylene glycol. This solution is then acidified to a pH of about 8 to 8.5. The acidified solution is aerated in activated sludge to reduce the biological oxugen demand (BOD) of the solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.