Patent ID: 7893193

Claim:
A process for preparing a chlorohydrin, comprising: (a) a polyhydroxylated aliphatic hydrocarbon, an ester of a polyhydroxylated aliphatic hydrocarbon or a mixture thereof is reacted with a chlorinating agent and an organic acid so as to give a mixture comprising the chlorohydrin and esters of the chlorohydrin (b) at least part of the mixture obtained in (a) is subjected to one or more treatments subsequent to (a) (c) polyhydroxylated aliphatic hydrocarbon is added to a mixture comprising one or more esters of the chlorohydrin subsequent to (a), so as to react, at a temperature greater than or equal to 20° C., with the one or more esters of the chlorohydrin, so as to form, at least partly, esters of the polyhydroxylated aliphatic hydrocarbon, wherein the reaction of the polyhydroxylated aliphatic hydrocarbon with the one or more esters of the chlorohydrin is carried out at a molar ratio between the polyhydroxylated aliphatic hydrocarbon and the one or more esters of the chlorohydrin that is greater than or equal to 0.01 and less than or equal to 20 mol/mol, and wherein either during (b), a fraction of the mixture obtained in (a) is withdrawn, this fraction is subjected to an evaporation treatment (I) in an evaporator, optionally in the presence of a gaseous stream, so as to remove the compounds more volatile than the chlorohydrin and than the one or more esters of the chlorohydrin and to obtain a part concentrated with chlorohydrin and with one or more esters of the chlorohydrin, and the polyhydroxylated aliphatic hydrocarbon is added to the withdrawn fraction of the mixture, prior to the evaporation treatment, and/or to the evaporator at a level higher than the level at which said evaporator is supplied with the fraction withdrawn in (a), or during (b), a fraction of the mixture obtained in (a) is withdrawn, this fraction is subjected to a stripping and/or distillation treatment (II) in a stripping and/or distillation column, so as to give a portion concentrated with chlorohydrin, and the polyhydroxylated aliphatic hydrocarbon is added to the withdrawn fraction of the mixture, prior to the stripping and/or distillation treatment, and/or to the stripping and/or distillation column at a level higher than the level at which said column is supplied with the fraction withdrawn in (a).