Method for separating normally liquid organic compounds
US4761222A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1987 |
| Grant date | Aug 2, 1988 |
| Priority date | — |
| Expiry date | Jun 16, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G21/22
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A mixture of normally liquid organic compounds, particularly a light cycle oil obtained by the catalytic cracking of petroleum oils, is separated by contacting the mixture with an essentially anhydrous organic sulfoxide, particularly dimethylsulfoxide, to dissolve an organic extract in said sulfoxide and form an extract phase, comprising sulfoxide and the organic extract, and a raffinate phase, comprising the organic raffinate; diluting the extract phase with about 4.0 to 10.0 wt. % of water; separating the diluted extract phase into an aqueous phase, comprising the water containing the sulfoxide dissolved therein, and an organic phase, comprising the organic extract with minor amounts of the sulfoxide and water; fractionating the organic phase to separate the water and sulfoxide from the organic extract, which is suitable for use as a flotation agent; recycling the thus separated water and sulfoxide to the dilution step; drying the aqueous phase to remove the water and produce an essentially anhydrous sulfoxide; and recycling the sulfoxide to the solvent extraction step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.