Abstract: Continuous process for the preparation of dry and storage-stable sodium vinyl sulfonate which comprisesA. adding, in a first stage, an alkali metal hydroxide to the starting aqueous solution of sodium vinyl-sulfonate in an amount such that the solution contains from 40 to 300 mg. of alkaline metal hydroxide per 100 g. of sodium vinyl-sulfonate,B. concentrating the resulting alkaline solution by evaporation in a second stage at a temperature of from 50.degree. to 100.degree.C. at a pressure of from 40 to 200 mm.Hg. to give an aqueous solution having a sodium vinyl-sulfonate concentration of from 40 to 55% by weight andC. in a third stage, subjecting the resulting concentrated solution to drying at a temperature of from 50.degree. to 100.degree.C. at a pressure of from 40 to 200 mm.Hg. to give solid sodium vinyl-sulfonate, the water content of which is, at most, 2% by weight.