N,N-Dimethylaniline → HCID 68131471, compound

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Reaction Steps

All or substantially all of the residual gaseous dimethylaniline is removed from the uprising gaseous mixture comprising gaseous dimethylaniline, sulfur dioxide gas and steam in rectifying section 35 by absorption in downwardly flowing aqueous concentrated sulfurous acid solution, the sulfurous acid solution being formed in rectifying section 35 due to the condensation of most if not all of the steam and the dissolution of a small amount of the sulfur dioxide gas in the resulting liquid water. The gaseous dimethylaniline reacts with the sulfurous acid of the dilute liquid aqueous sulfurous acid solution in rectifying section 35 to form dimethylaniline sulfite. Liquid aqueous solution containing sulfurous acid and dimethylaniline sulfite is withdrawn at an elevated temperature of typically 155°F. from a lower portion of rectifying section 35 through line 40 and, after being indirectly cooled in cooler 41, with a cooling fluid, ordinarily water, is recycled and introduced into the upper portion of rectifying section 35 through line 42.

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