Extraction separation
US4001341A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1964 |
| Grant date | Jan 4, 1977 |
| Priority date | — |
| Expiry date | Jan 24, 1984 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/72
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
1. A process for purifying, in a countercurrent extraction system, a crude 2,6-xylenol feed of 20 to 98% by weight initial purity containing phenolic impurities consisting essentially of phenol and cresols comprising introduction of aqueous inorganic alkali countercurrently to a phenolic impurity-solvent hydrocarbon phase and said crude 2,6-xylenol feed, said aqueous inorganic alkali being introduced at the top of a countercurrent extraction rectifier, said phenolic inpurity-solvent hydrocarbon phase being introduced at the bottom of said countercurrent rectifier, and said crude 2,6-xylenol feed being introduced at a point intermediate thereto, whereby a substantially pure 2,6-xylenol-solvent hydrocarbon stream is removed from the top of the countercurrent extraction rectifier and a first aqueous phase stream is removed from the bottom of the countercurrent extraction rectifier consisting essentially of an aqueous solution of the inorganic alkali salts of the phenolic impurities and a minor portion of the 2,6-xylenol, recovering said portion of the 2,6-xylenol from its aqueous alkali salt solution by contacting it countercurrently with a phenolic impurity-solvent hydrocarbon phase …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.