Title: Process for the preparation of 2,2-bis-(4-hydroxy-3-chlorophenyl)-propane

Abstract: Process for the preparation of especially pure 2,2-bis-(4-hydroxy-3-chlorophenyl)-propane (dichlordiane, DCD) by the chlorination of 2,2-bis-(4-hydroxyphenyl)-propane in the presence of solvents that are substantially indifferent to chlorine by prior-art methods; then, for purification, the chlorinated bis-phenol is dissolved in halogenated hydrocarbons and/or halogenated hydrocarbon in which are liquid at 20.degree.C which they are readily soluble in the absence of an aqueous phase but in which they are at most only slightly soluble after the addition of water thereto; and the 2,2-bis-(4-hydroxy-3-chlorophenyl)-propane, is thereby precipitated from this aqueous solution.

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Inventors: Zoche, Gunter (Bonn-Beuel, DT)
Richtzenhain, Hermann (Post Marialinden, DT)
Ismail, Roshdy (Neunkirchen, DT)

Application Number: 442939
Filing Date: 1974-02-15
Publication_date: 1976-01-13
Assignee: Dynamit Nobel Aktiengesellschaft (Troisdorf, DT)
Primary Class(es): 568/725 568/726
Other Classes:
US Patent Ref:

2254904	Sep, 1941	Moss	260/619.
2812365	Nov, 1957	Gump	260/619.
3673262	Jun, 1972	Prehl	260/619.

Other Refs:
Primary Examiner: Thomas, Jr., James O.
Assistant Examiner: Lone, W. B.
Attorney: Burgess, Dinklage & Sprung