N,N-Dimethylaniline → HCID 68131471, compound

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Reaction Steps

All or substantially all of the residual gaseous dimethyl aniline is removed from the uprising gaseous mixture comprising gaseous dimethyl aniline, sulfur dioxide gas and steam in rectifying section 32 by absorption in downwardly flowing quite concentrated aqueous sulfurous acid solution, the sulfurous acid solution being formed in rectifying section 32 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 dimethyl aniline reacts with the sulfurous acid of the dilute liquid aqueous sulfurous acid solution in rectifying section 32 to form dimethyl aniline sulfite. Liquid aqueous solution containing sulfurous acid and dimethyl aniline sulfite is withdrawn at an elevated temperature of typically 155°F. from a lower portion of rectifying section 32 through line 47 and, after being indirectly cooled in cooler 48 with a cooling fluid, ordinarily water, is recycled and introduced into the upper portion of rectifying section 32 through line 49.

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