N,N-Dimethylaniline → HCID 68131471, compound

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Reaction Steps

A gaseous mixture of gaseous dimethyl aniline, SO2 gas and steam leaves stripping section 26 of tower 28 and enters and passes upwardly within rectifying section 32. Substantially all dimethyl aniline is removed from such gaseous mixture in rectifying section 32 by absorption in fairly concentrated aqueous sulfurous acid solution flowing downwardly in rectifying section 32. The sulfurous acid solution is formed in rectifying section 32 due to the dissolution of a minor portion of the SO2 gas in liquid water resulting from condensation of all or virtually all of the steam. The gaseous dimethyl aniline reacts with the sulfurous acid in rectifying section 32 to form dimethyl aniline sulfite. Liquid aqueous solution containing sulfurous acid and dimethyl aniline sulfite is withdrawn from a lower portion of rectifying section 32 at an elevated temperature of 155°F. through line 47 and, after being indirectly cooled in cooler 48 with cooling water, is pumped at a temperature of 75°F. and a flow rate of 335 g.p.m. into the upper portion of rectifying section 32 above the uppermost tray therein through line 49.

Provenance & Evidence