Process for the preparation of naphthalene-1,3,5-trisulphonic ac

Details Process for the preparation of naphthalene-1,3,5-trisulphonic ac Process for the preparation of naphthalene-1,3,5-trisulphonic ac

1981-07-28

1983-01-18

Siegel, Alan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14324

Patent

active

043691439

ABSTRACT:
A process is provided for the preparation of naphthalene-1,3-5,-trisulphonic acid from 1,5-disulphonated naphthalene, which comprises sulphonating 1,5-disulphonated naphthalene, in the form of a mixture which has been obtained by mixing naphthalene and SO.sub.3 in the presence of an inert solvent at temperatures in the range of -40.degree. to +20.degree. C., the ratio of SO.sub.3 added to naphthalene added having been in the range of 2.5 to 10 mols of SO.sub.3 per mol of naphthalene during the entire addition, at 60.degree. to 110.degree. C. in anhydrous sulphuric acid with oleum, with prior or concurrent separation of the inert solvent.
The resulting product is a known intermediate for the formation of azo dyestuffs.

REFERENCES:
Gilbert "Sulfonation & Related Reactions" (1965), p. 89.
Ullmann's "Enzyklopadie der Technischen Chemie" 3rd ed., vol. 12, pp. 596,631.

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