Process for the preparation of polyglycerols

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

1989-12-19

1991-08-20

Mars, Howard T.

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

Organic compounds

Oxygen containing

568621, 568679, 568680, C07C 4103

Patent

active

050416880

ABSTRACT:
The invention relates to a process for the preparation of polyglycerols (with more than 50% by weight of diglycerol) which are low in cyclic components, by reacting glycerol with chlorohydrins. In this reaction, glycerol is reacted with epichlorohydrin (instead of chlorohydrin) at temperatures from 20.degree. to 120.degree. C. and at certain mole ratios of glycerol to epichlorohydrin and in the presence of an acidic catalyst and the reaction mixture obtained, which has not been separated into its components, is reacted at a temperature from 50.degree. C. to 120.degree. C. according to the content of organically bound chlorine in the reaction mixture, with an alkaline-reacting, preferably aqueous solution. After the addition of water, the reaction mixture is desalinated via one or more cation and subsequent anion exchangers, dehydrated by distillation and the glycerol-polyglycerol mixture obtained is separated by fractional distillation into glycerol, diglycerol and higher polyglycerols.

REFERENCES:
patent: 2260753 (1941-10-01), Marple et al.
patent: 2520670 (1950-08-01), Wittcoff et al.

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