Process for the production of 4-nitrotoluene-2-sulfonic acid

Details Process for the production of 4-nitrotoluene-2-sulfonic acid Process for the production of 4-nitrotoluene-2-sulfonic acid

1987-04-29

1990-05-01

Siegel, B. Alan

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

Organic compounds

Sulfonic acids or salts thereof

562 60, C07C14324

Patent

active

049220080

ABSTRACT:
A process for the preparation of 4-nitrotoluene-2-sulfonic acid by sulfonating 4-nitrotoluene with oleum or liquid SO.sub.3 is described. The sulfonation is carried out continuously with oleum of at least 50% concentration or liquid 100% SO.sub.3 while keeping the conversion of 4-nitro-toluene in the reaction mixture at .gtoreq.90% during the entire reaction course.
The process is inherently non-polluting, and provides the product in high yield and low sulfuric acid content in a form usable for 4,4'-dinitrostilbene-2,2'-disulfonic acid production without further purification.

REFERENCES:
patent: 3840591 (1974-10-01), Lee et al.
patent: 3923666 (1975-12-01), Dill
patent: 3935237 (1976-01-01), Davidsohn
patent: 3941810 (1976-03-01), Koebner
patent: 3946037 (1976-03-01), Koebner
patent: 4382039 (1983-05-01), Goldschmitt
Gilbert, Sulfonation & Related Reactions (1965) p. 82.
Chemical Abstracts 9394991u, (1980) p. 616.
CA 9371290a, (1980) p. 931 25-Noncondensed Aromatics.

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