Removal of thermal stable salts from organic solvents

摘要

Process for removal of salts thermally non-regenerable in a temperature range from 0° C. to 200° C., from organic solvents in an aqueous solution by evaporation, the normal boiling point of organic solvents being higher than that of water, and by enriching the organic constituents existing in the solvent as well as the heat stable salts existing therein in a liquid phase forming by evaporation of water and a portion of the organic constituents of a first vessel, and discharging an evolving vaporous phase from the first vessel. In particular, the liquid phase formed in the first vessel is passed into a second vessel, water in vaporous and/or liquid form being passed into the second vessel, water and another portion of the organic constituents contained in the solvent being evaporated and forming a vaporous phase which is discharged from the second vessel, the heat stable salts being enriched in concentration in the liquid phase forming in the second vessel, and wherein a partial stream of the liquid phase formed in the second vessel is discharged from the second vessel.

主权项

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.