Extractive destillation with subsequent lower pressure adiabatic vaporization
Abstract
Abstract AN IMPROVED PROCESS UTILIZING EXTRACTIVE DISTILLATION IS EMPLOYED FOR THE SEPARATION OF ORGANIC COMPOUNDS HAVING DIFFERENT DEGREES OF POLARITY DUE FOR EXAMPLE, TO DIFFERENT DEGREES OF UNSATURATION. THE EXTRACTIVE DISTILLATION IS CONDUCTED BY SUBSTITUTING, AT LEAST IN PART, PRESSURE DIFFERENTIALS FOR TEMPERATURE AS THE DRIVING FORCE FOR THE PROCESS. THIS CONCEPT IS CARRIED OUT BY THE USE OF AT LEAST ONE OF (A) CONDUCTING THE EXTRACTIVE DISTILLATION IN AT LEAST TWO ZONES OF DIFFERENT PRESSURE, THE PRESSURE IN EACH ZONE BEING SELECTED SO THAT THE SOLUBILITY OF THE SOLUTE IN THE SOLVENT IN ONE ZONE IS SUBSTANTIALLY EUQL TO THE SOLUBILITY OF THE SOLUTE IN THE SOLVENT IN THE OTHER ZONE, (B) PARTIALLY REMOVING THE HEAVY COMPONENTS FROM THE SOLVENT IN THE BOTTOM STREAM FROM THE EXTRACTIVE DISTILLATION BY AN ADIABATIC VAPORIZATION PRIOR TO CONVENTIONAL SOLVENT STRIPPING, AND (C) USING THE SOLVENT-FREE HEAVY COMPONENT AS REBOIL VAPORS FOR THE EXTRACTIVE DISTILLATION STEP.
Inventors
- 👤 R Bannister
- 👤 G Harris
- 👤 J Boston
Bibliographic Details
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