Process for the preparation of polyglycerins

The invention relates to a process for the preparation of polyglycerols which are low in cyclic components by reacting glycerol with chlorohydrins at elevated temperature. Here, glycerol or diglycerol or a higher polyglycerol are reacted with epichlorohydrin (instead of chlorohydrin) at certain temperatures and certain molar ratios of glycerol or diglycerol or higher polyglycerol to epichlorohydrin and the resulting, not separated reaction mixture at a temperature of 50 ° C to 120 ° C. , Preferably 80 ° C to 95 ° C, according to the content of the reaction mixture of organically bound chlorine, an alkaline, preferably aqueous solution was added. The reaction mixture is desalted after addition of water via one or more cation and subsequent anion exchangers,