Patent ID: 6180839
Filing Date: 2001-01-30
Classification: C07C

Abstract:
A process for the continuous preparation of dimethylvinylcarbinol (DMVC) by continuously reacting prenol with the aqueous solution of a protic acid in the still or in the lower part of a rectification column while distilling off the DMVC formed in the form of an azeotropic mixture with water, which comprisesa) during the reaction ensuring that as far as possible no liquid two-phase mixture forms in the reaction mixture,b) distilling off the DMVC which forms at a reflux ratio of at least 2 andc) setting the reaction volume and/or the amount of prenol added per hour and/or the concentration of protons in the reaction mixture in such a manner that the quotient, defined as residence time concentration coefficient, of the reaction volume and the volume of prenol added per hour multiplied by the concentration of protons in the reaction mixture has a value between 0.001 h.multidot.mol/l and 1 h.multidot.mol/l.