Method for separating a C4 fraction by means of extractive distillation using a selective solvent

Method for separating a C4 fraction by means of extractive distillation using a selective solvent

  • CN 102,656,131 A
  • Filed: 11/02/2010
  • Published: 09/05/2012
  • Est. Priority Date: 11/03/2009
  • Status: Active Application
First Claim
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1. one kind through coming separation of C with selective solvent (1) extractive distillation 4The method of cut (2), said method are that in distillation unit (K I, K II) adverse current is carried C in liquid phase 4Cut and selective solvent (1) separate and contain from C 4The butane of cut and the overhead of butylene (3) and contain selective solvent and the C except that butane and butylene 4The bottom stream of other component of cut (6) therefrom will be except that the C butane and the butylene in other process step 4Other component degassing of cut is wherein got the C in material point and the distillation unit (K I, K II) in overhead (3) 4From distillation unit (K I, K II), take out energy between cut (2) feeding point.

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