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Recovery of glycerine from saline waters

  • US 4,599,178 A
  • Filed: 07/16/1984
  • Issued: 07/08/1986
  • Est. Priority Date: 07/16/1984
  • Status: Expired due to Term
First Claim
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1. A process for recovering glycerine from a saline aqueous stream resulting from the manufacture of epoxy resins and containing from about 1 to about 7% w glycerine and at least about 5% w sodium chloride which process comprises:

  • (a) evaporating the feed stream to remove water and to precipitate at least about 85% of the salt content of the feed stream,(b) separating the liquid phase from the precipitated salt,(c) diluting the liquid phase product of step b in a detention zone with an aqueous stream to obtain a diluted liquid phase product having a viscosity less than about 10 centipoise,(d) subjecting the product of step c to an electrodialysis step in which the saline components migrate through fixed anion and cation exchange membranes to a concentrate stream or streams leaving a diluate stream or streams reduced in saline content,(e) recycling the concentrate stream from step d to the evaporating step a, and(f) recovering glycerine from the diluate stream of step d by fractional distillation.

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