Prodn. of oligo:glycerol mixts. - by condensing glycerol in presence of boron cpd. and continually removing water formed

摘要

Prodn. of oligoglycerol mixts. is effected by condensing glycerol in the presence of a B cpd. while continuously removing the H20 formed. The reaction is terminated when the amt. of H20 removed corresponds to the amt. theoretically required for diglycerol formation. The process gives prods. with a higher diglycerol content than processes using alkali metal base catalysts and with a higher content of alpha, alpha-linked diglycerol than processes using silicate catalysts. The reaction is effected at 200-260 deg.C. in the presence of 1-10 wt.% Li, Na or K metaborate or Na tetraborate. USE/ADVANTAGE - Diglycerol is useful for making fatty acid esters, which are useful as food and cosmetic emulsifiers and for industrial applications, e.g. as lubricants or stabilisers for PVC.ef