| abstract |
A process for the preparation of an aminoalkyl half-ester of sulfuric acid by simultaneously adding an aminoalkanol and sulfuric acid to a suspending medium, boiling at 70°-150° C., with vigorous mixing, distilling off the water formed during the reaction, and any water introduced with the starting materials, together with a part of the suspending medium, as an azeotrope, separating off the water from the condensed azeotrope and recycling the suspending medium, as a gas, to the reaction mixture. |