Process for the purification of dihydric phenols

Details Process for the purification of dihydric phenols Process for the purification of dihydric phenols

2006-03-30

2009-06-02

Boykin, Terressa M (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

C528S176000, C528S190000, C528S193000, C562S485000, C562S486000, C562S600000, C568S637000, C568S749000, C568S750000

Reexamination Certificate

active

07541417

ABSTRACT:
A process comprising the steps of dissolving a dihydric phenol in a solvent to form a solution A, contacting the solution A with an adsorbent material selected from the group consisting of metal oxides, modified metal oxides, activated carbons, and clays, filtering the adsorbent material to form a solution B, adding an anti-solvent to the solution B to form a solution C, and distilling the solution C, wherein the dihydric phenol is represented by Formula (I):wherein R is a hydrogen atom or an aliphatic functionality having 1 to 6 carbon atoms and n is an integer having a value of 1 to 4.

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Sci-Tech Encyclopedia McGraw-Hill Encyclopedia of Science and Technology, 5th edition, published by The McGraw-Hill Companies, Inc. 2008.
PCT International Search Report for International Application No. PCT/US2007/004302, filed Feb. 16, 2007.

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