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Aromatic separation process

  • US 2,970,106 A
  • Filed: 01/31/1958
  • Issued: 01/31/1961
  • Est. Priority Date: 01/31/1958
  • Status: Expired due to Term
First Claim
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1. A PROCESS WHICH COMPRISES CONTACTING A DISTILLATE CHARGE AROMATICS-CONTAINING HYDROCARBON MIXTURE HAVING A DEFINITE BOILING RANGE WITH ONE SIDE OF A PLASTIC PERMEATION MEMBRANE WHICH PREFERENTIALLY PERMEATES AROMATICS AND NON-AROMATICS SEPARABLE THEREFROM BY DISTILLATION, PERMEATING A PORTION OF THE CHARGE MIXTURE THROUGH SAID MEMBRANCE, SAID PERMEATED PORTION COMPRISING AROMATICS AND REDUCED CONCENTRATION OF CLOSELY BOLING NON-AROMATICS, SEPARTELY RECOVERING PERMEATED AND NONPERMEATED PORTIONS HAVING HIGHER AND LOWER CONCENTRATIONS OF AROMATICS RESPECTIVELY THAN THE CHARGE MIXTURE, AND DISTILLING THE PERMEATED PORTION TO SEPARATE A LOWER BOILING FRACTION FROM A HIGHER BOILING FRACTION WHICH HIGHER BOILING FRACTION HAS A HIGHER CONCENTRATION OF AROMATICS THAN THE PERMEATED PORTION WHICH IS PASSED TO THE DISTILLATION STEP AND A HIGHER CONCENTRATION OF AROMATICS THAN COULD BE OBTAINED BY ONLY DISTILLING THE DISTILLATE CHARGE.

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