Process for recovering a crystallization medium

Details Process for recovering a crystallization medium Process for recovering a crystallization medium

1982-01-28

1984-02-21

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568751, 568756, C07C 3784

Patent

active

044331819

ABSTRACT:
A process is provided for recovering the crystallization medium used for separating a 2,6-disubstituted phenol (DSP) from a feedstock containing it and a phenol in which only one of the 2 or 6 carbon positions are substituted (MSP). More particularly, the process comprises crystallizing said DSP from said feedstock with a water miscible non solvent crystallization medium, separating the resultant DSP crystals from said crystallization medium and feedstock, washing said DSP crystals with crystallization medium, washing said DSP crystals with water, passing the aforesaid wash water and crystallization medium along with the crystallization medium and feedstock from which the DSP was crystallized to an extraction means and extracting MSP with a water immiscible and crystallization medium immiscible extractant, stripping the extractant from the MSP and recycling the extractant to the extraction means and separating water from the crystallization medium of the extraction means and recycling the water for use in the water wash or extraction means and recycling the crystallization medium for the initial crystallization, the wash of the DSP crystals, or to the extraction means.

REFERENCES:
patent: 2493781 (1950-01-01), Schneider et al.
patent: 2499236 (1950-02-01), Gilder et al.
patent: 2536040 (1951-01-01), Davidson
patent: 2863927 (1958-12-01), Parisse

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