Patent ID: 7049464

Claim:
A process for producing an aminoalkylsulfonic acid represented by the general formula [2]: wherein R 1 and R 2 are each independently a hydrogen atom, an alkyl group, an aryl group or an aralkyl group; and R 3 and R 4 are each independently a hydrogen atom or an alkyl group, comprising reacting an aminoalkylsulfonate salt represented by the general formula [1]: wherein M is an alkali metal atom, an organic ammonium ion or an ammonium ion; and R 1 to R 4 are the same as described above, an aqueous solution thereof, or a solution dissolving any one of them in a water-soluble organic solvent, selected from alcohols having 1 to 3 carbon atoms, carboxylic acids having 2 to 12 carbon atoms and dimethylformamide, with an organic acid.