N,N-Dimethylaniline → Benzenamine, N,N-dimethyl-, sulfate (1:1)

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Reaction Steps

The uprising effluent gas leaves the sulfurous acid scrubbing section 9 still containing a small amount of residual gaseous dimethyl aniline as well as a small amount of sulfur dioxide gas, and enters and passes upwardly within sulfuric acid scrubbing section 10, wherein the gas is bubbled through a descending current of dilute sulfuric acid aqueous solution typically of 10 percent sulfuric acid concentration which is introduced into the upper portion of sulfuric acid scrubber 10 above the uppermost tray therein through conduit 23. All or substantially all of the residual gaseous dimethyl aniline is removed from the sulfur dioxide-impoverished gas in scrubbing section 10 by reaction with the sulfuric acid to form dimethyl aniline sulfate. The tail gas exits from sulfuric acid scrubber 10 via line 18 and typically contains less than 0.10 percent by volume sulfur dioxide. Dilute liquid aqueous sulfuric acid solution containing the thus-formed dimethyl aniline sulfate is removed from the lowermost tray in scrubbing section 10 and passed through line 64 to recycle tank 65. A portion of the dilute liquid acid solution in tank 65 is recycled through line 68 and introduced into the upper portion of scrubbing section 10 above the uppermost tray therein.

Provenance & Evidence