Process for the preparation of polyglycerols

Details Process for the preparation of polyglycerols Process for the preparation of polyglycerols

1990-01-03

1991-02-12

Mars, Howard T.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568620, 568679, C07C 4103

Patent

active

049925946

ABSTRACT:
A process is disclosed for the preparation of polyglycerols (containing more than 50% by weight of diglycerol) which have a low content of cyclic components, by reacting chlorohydrins. In this reaction .alpha.-monochlorohydrin and epichlorohydrin are reacted at temperatures of 20.degree. to 120.degree. C., preferably 50.degree. C. to 100.degree. C., in a molar ratio of epichlorohydrin to .alpha.-monochlorohydrin of 0.8:1 to 1:2.5 in the presence of acids or compounds having an acid reaction. A medium having an alkaline reaction, preferably an aqueous solution having an alkaline reaction, is added to the resulting unseparated reaction mixture, at a temperature of 50.degree. C. to 120.degree. C., preferably 80.degree. C. to 95.degree. C. The amount of this addition is based on the content of organically-bound chlorine in the reaction mixture. After the addition of water, the reaction mixture is desalinated via one or more cation exchangers and subsequently anion exchangers. Water is removed by distillation, and the diglycerol/polyglycerol mixture (containing a proportion of glycerol) is separated into diglycerol, higher polyglycerols and, if appropriate, glycerol by fractional distillation.

REFERENCES:
patent: 2520670 (1950-08-01), Wittcoff et al.

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