Method of preparing a disalt of 3,3-sulfonylbis (6-hydroxybenzen

Details Method of preparing a disalt of 3,3-sulfonylbis (6-hydroxybenzen Method of preparing a disalt of 3,3-sulfonylbis (6-hydroxybenzen

1975-09-12

1977-09-06

Helfin, Bernard

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

106 15FP, 210 59, 260DIG24, C07C14342

Patent

active

040468062

ABSTRACT:
When 4,4'-dihydroxydiphenyl sulfone is sulfonated to form 3,3'-sulfonylbis(6-hydroxybenzene sulfonic acid), the product can be recovered from the reaction mixture by adding methanol or ethanol and a base to the reaction mixture to selectively precipitate only the disalt of the product. Particularly good results are obtained using sulfolane as a solvent in the sulfonation reaction. The product is useful as a flame retardant additive in polymers and other materials, and is also useful as an additive in boiler water to remove or prevent formation of scale.

REFERENCES:
patent: 2171806 (1939-09-01), Russell et al.
patent: 3663509 (1972-05-01), Bonnard et al.
Zehenter et al., J. Prakt. Chem., 117, 233 (1927).
Zehenter et al., Chem. Abstract, 22, 949 (1928).

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