Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1980-07-08
1982-04-27
Helfin, Bernard
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
570211, C07C 4122
Patent
active
043272274
ABSTRACT:
Highly purified brominated aromatic compounds such as decabromodiphenyl ether, pentabromophenol, and the like may be obtained by grinding the crude brominated product to provide particles predominantly less than about 20 microns in diameter and thereafter heating the crude ground brominated product for a time and at a temperature in order to effect substantial removal of the bromine and hydrogen bromide impurities therefrom. Optionally, the product may be ground a second time after the heating step to optimize product particle size and liberate residual impurities. The foregoing procedure is especially effective where the brominated compound is a thermally stable solid under the conditions of treatment and is substantially free from impurities containing aliphatic and alicyclic hydrocarbon groups.
REFERENCES:
patent: 2022634 (1935-11-01), Britton et al.
patent: 3733366 (1973-05-01), Burk
patent: 3752856 (1973-08-01), Nagy et al.
patent: 3833674 (1974-09-01), Brackenridge
patent: 3965197 (1976-06-01), Stepniczka
Coulson et al., Chemical Engineering, vol. II, (1955), p. 867.
Ayres James T.
McAllister David L.
Sands John L.
Great Lakes Chemical Corporation
Helfin Bernard
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