N,N-Dimethylaniline → HCID 68131471, compound

Participants

Reaction Steps

A gaseous mixture of gaseous dimethylaniline, SO2 gas and steam leaves stripping section 30 of tower 31 and enters and passes upwardly within rectifying section 35. Substantially all dimethylaniline is removed from such gaseous mixture in rectifying section 35 by absorption in dilute aqueous sulfurous acid solution flowing downwardly in rectifying section 35. The sulfurous acid solution is formed in rectifying section 35 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 dimethylaniline reacts with the sulfurous acid in rectifying section 35 to form dimethylaniline sulfite. Liquid aqueous solution containing sulfurous acid and dimethylaniline sulfite is withdrawn from a lower portion of rectifying section 35 at an elevated temperature of 155°F. through line 40 and, after being indirectly cooled in cooler 40 with cooling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 35 above the uppermost tray therein through line 42. There also is a net overflow of solution into stripping section 30 equal in volume to steam condensed in rectifying section 35.

Provenance & Evidence