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US 4,504,364 AGranted
Phenol purification
AssigneeThe Lummus Company
InventorsJamin Chen, Ali M. Khonsari, George D. Suciu
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Abstract
In the production of high purity phenol, a water-phenol mixture recovered from the top of a distillation column is contacted with a water immiscible solvent to extract methyl benzofuran and other by-products and impurities in phenol production therefrom, with the extraction being accomplished at a temperature at which the water-phenol mixture is present as a single phase liquid. The remaining mixture of phenol and water is recycled to the distillation.
Claims11
A process for purifying phenol comprising:
- distilling in the presence of water a crude phenol containing impurities comprising methylbenzofuran to recover as separate streams a mixture of phenol and water, containing said impurities, and phenol having a reduced quantity of impurities;
- contacting the recovered mixture with a water immiscible extraction solvent to extract impurities from said mixture, said contacting being effected at a temperature at which the water and phenol in the mixture are completely miscible to provide said water-phenol mixture (is) as a single-phase liquid, said extraction solvent being employed in an amount whereby at least 60% of the phenol of the recovered mixture is contained in a remaining mixture of water and phenol;
- and
- separating the solvent containing extracted impurities from the remaining mixture of water and phenol, said remaining mixture containing at least 60% of the phenol in the recovered mixture subjected to said contacting.
1 more element
Dependencies are inferred from the claim text.