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Removal of thermal stable salts from organic solvents

  • US 9,427,696 B2
  • Filed: 01/29/2011
  • Issued: 08/30/2016
  • Est. Priority Date: 02/26/2010
  • Status: Active Grant
First Claim
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1. A process for removal of heat stable salts thermally non-regenerable in a temperature range from 0°

  • C. to 200°

    C. from organic solvents in an aqueous solution by evaporation comprising steps of;

    (a) placing an aqueous solution containing organic solvents with a normal boiling point being higher than that of water and heat stable salts forming a liquid phase into a first vessel and evaporating water in the first vessel,(b) passing the liquid phase containing the organic solvents and the heat stable salts from the first vessel into a second vessel,(c) passing water in vaporous form, liquid form, or both into the second vessel,(d) evaporating water and a portion of the organic solvents as a vaporous phase and discharging the vaporous phase from the second vessel,(e) enriching the heat stable salts in concentration in a remaining liquid phase of the second vessel, and,(f) discharging a partial stream of the remaining liquid phase from the second vessel.

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