Integrated treatment system for refinery oily sludges
US5271851A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1993 |
| Grant date | Dec 21, 1993 |
| Priority date | — |
| Expiry date | Mar 8, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D29/885
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for the treatment of refinery oily sludges to produce an oily fraction that is reprocessed in the refinery into (i) salable products and (ii) a solid residue meeting environmental regulatory agency requirements for disposal in non-hazardous solid waste landfills. The process includes mixing the refinery oily sludge with a particulate filter aid and preferably a single solvent selected from refinery intermediate and product streams and contacting this mixture with plate filters in a closed filter vessel. A cake residue forms on the filter plates and a filtrate mixture of oil, water and solvent is produced. The filtrate is separated into an oily fraction and a water fraction. The oily fraction is rerouted to refinery operating units for processing into salable products. The water fraction is routed to a refinery water treatment system. When filter cake residue has built to a predetermined level, charge to the filter vessel is discontinued. The filter cake residue is washed with a predetermined quantity of solvent and then steam stripped to remove petroleum hydrocarbons to a desired residual level, e.g. less than about 1,000 ppm or less than 500 ppm. The steam stripped filte…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.