Process for producing 4,4'-diphenyldisulfonic acid and its monop

Details Process for producing 4,4'-diphenyldisulfonic acid and its monop Process for producing 4,4'-diphenyldisulfonic acid and its monop

1982-07-21

1983-05-10

Siegel, Alan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260505R, C07C14324

Patent

active

043828965

ABSTRACT:
A process for producing 4,4'-diphenyldisulfonic acid is disclosed, which comprises the steps of adding a sulfonating agent to molten diphenyl at a temperature within a range of 130.degree. to 145.degree. C., and when crystallization commences of 4,4'-diphenyldisulfonic acid within such temperature range, cooling the reaction mixture to a temperature within a range of 115.degree. to 127.degree. C., and letting the disulfonation reaction complete while the reaction mixture is maintained within the cooled temperature range. A process for producing monopotassium 4,4'-diphenyldisulfonate is also disclosed, in which steps are taken of adding a sulfonating agent to diphenyl, then controlling the sulfuric acid concentration to 45 to 55%, and while the reaction mixture is heated to at least 140.degree. C., adding at least a stoichiometric amount of a potassium salt of an inorganic acid.

REFERENCES:
patent: 1865776 (1932-07-01), McCullough
patent: 1942386 (1934-01-01), Stoesser et al.
patent: 2978500 (1961-04-01), Goodman et al.

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