Process for the preparation of 4-nitrotoluene-2-sulphonic acid

Details Process for the preparation of 4-nitrotoluene-2-sulphonic acid Process for the preparation of 4-nitrotoluene-2-sulphonic acid

1982-04-20

1983-05-03

Siegel, Alan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14324

Patent

active

043820395

ABSTRACT:
In a process for the preparation of 4-nitrotoluene-2-sulphonic acid by reacting 4-nitrotoluene with gaseous sulphur trioxide at an elevated temperature, the improvement wherein molten 4-nitrotoluene is reacted with gaseous sulphur trioxide at a temperature in the range from 60.degree. to 150.degree. C. under a pressure above the vapor pressure of 4-nitrotoluene, in a molar ratio of sulphur trioxide to 4-nitrotoluene of 0.1:1 to 1.5:1, and, after a conversion of at least 70 percent of the reaction component not employed in excess is achieved, the sulphonation mixture is treated with water.

REFERENCES:
Gilbert, "Sulfonation & Related Reactions" (1965) pp. 71, 82.

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