Process for the preparation of mixtures of cyclic acrolein glycerol acetals

Abstract From the Canadian patent

Mixtures of cyclic acrolein glycerol acetals can be obtained in higher volume/time yields than in prior art processes and with very high selectivity from the reaction of acrolein with glycerol in the presence of a solid acid catalyst and distillative working up if the reaction is carried out in the presence of the reaction mixture consisting substantially of acrolein, glycerol, cyclic acrolein glycerol acetals and water, this reaction mixture being used as solvent and, without additional solvents. If necessary a pH increasing, agent may be added to the reaction mixture after the latter, has been freed from catalyst and before it is worked up by distillation, in an amount such that the pH of …