Process for purifying a 2,6-dialkylphenol

Details Process for purifying a 2,6-dialkylphenol Process for purifying a 2,6-dialkylphenol

1995-10-26

1997-01-07

Bhat, Nina

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203 37, 203 95, 203DIG16, 568749, 568756, 568781, B01D 334, C07C 3768

Patent

active

055913113

ABSTRACT:
A process for purifying impure 2,6-diisopropylphenol (DIP) mixtures having lower and higher boiling phenolic impurities is described. The process involves washing the mixture with aqueous alkali metal hydroxide solution in an inert atmosphere and separating the aqueous and organic phases, washing the resulting organic phase with water, and then subjecting the water-washed organic phase to distillation in an inert environment to recover purified DIP. Since only one distillation is required rather than two, the development of impurities in the DIP caused by in situ oxidation reactions at elevated temperatures due to the inevitable presence of traces of air in commercial distillation facilities is reduced to acceptable levels.

REFERENCES:
patent: 4634796 (1987-01-01), Suciu et al.
patent: 5091058 (1992-02-01), Davie
patent: 5175376 (1992-12-01), Nieminen et al.
patent: 5264085 (1993-11-01), Inaba et al.
patent: 5487816 (1996-01-01), Schulz et al.

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