Patent ID: 6900350

Claim:
A process for the preparation of an ω-aminoalkyl-sulphonic acid from a secondary amine, an alkyl dihalide, and an alkali metal sulphite, comprising the steps of: (a) reacting a secondary amine with an alkyl dihalide in an aqueous solution at a pH value of 8-10, wherein the pH is maintained by the addition of an alkali metal hydroxide, to produce an intermediate solution; (b) adjusting the intermediate solution to a pH value of 0-1 by the addition of a hydrohalic acid; (c) after step (b), separating off excess alkyl dihalide; (d) after step (c), adjusting the pH value of the intermediate solution to 6-7.5 by addition of an alkali metal hydroxide; (e) after step (d), adding an alkali metal sulphite; and (f) conducting a reaction at elevated temperature to form a solution containing ω-aminoalkyl-sulphonic acid.