Patent ID: 7939696
Filing Date: 2011-05-10
Classification: C07C

Abstract:
1. A process for the manufacture of dichloropropanol in which glycerol is reacted with a chlorinating agent comprising hydrogen chloride in a vessel in which a liquid medium is in equilibrium with a vapour phase and according to which corrosion of at least a part of an inner vessel wall above the level of the liquid medium is at least partially avoided by: (i) heating said inner vessel wall in order to maintain at least part of the inner vessel wall at a temperature at least 1° C. higher than the dew temperature of the vapour phase, or (ii) trickling said inner vessel wall with a liquid having a temperature which is lower than the temperature of the vapor phase, or (iii) trickling said inner vessel wall with a liquid having a composition that allows to dilute a condensed vapor phase, or (iv) combining (ii) and (v) where (v) is: (v) cooling said inner vessel wall in order to maintain at least part of the inner vessel wall at a temperature lower than 120° C., or combining (iii) and (v), or combining (ii) and (iii) and (v), or combining (i) and (iii).