Removal of metals and color bodies from chemically recycled bisp

Details Removal of metals and color bodies from chemically recycled bisp Removal of metals and color bodies from chemically recycled bisp

1996-07-01

1998-01-06

Dees, Jose G.

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

Organic compounds

Oxygen containing

C07C 3768

Patent

active

057057141

ABSTRACT:
An improved process for the purification of solid dihydric phenol, preferably bisphenol-A recovered from a polymer containing the reaction residue of dihydric phenol units in the polymer structure by essentially dry distilling dihydric phenol in the presence of about 0.005 to about 0.05 weight percent of hypophosphorous acid based on the weight of dihydric phenol.

REFERENCES:
patent: 4885407 (1989-12-01), Fox
patent: 5382708 (1995-01-01), Kissinger

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