Petroleum Processing and Petrochemicals ›› 2014, Vol. 45 ›› Issue (8): 71-76.

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ADSORPTION SEPARATION OF NORMAL PARAFFINS FROM NAPHTHA BY SIMULATED MOVING BED BASED ON MOLECULE-SCALE MANAGEMENT

Jun-Tao JunLIU, ,Liu Ji-chang,Benxian Shen   

  • Received:2014-01-20 Revised:2014-03-20 Online:2014-08-12 Published:2014-07-22
  • Contact: Liu Ji-chang E-mail:liujc@ecust.edu.cn

Abstract: Based on molecule-scale management, using 5A molecule sieve as adsorbent, a liquid-phase simulated moving bed (SMB) technology was used to separate normal paraffins from naphtha. The rules of separation process and effect of circulation ratio, distribution ratio and desorbent/naphtha flow ratio on the separation performance of SMB were investigated. Under 2.0 MPa, 170 ℃, LHSV of 0.024 h-1 and switching time of 900 s, the optimized operating conditions are:desorbent/naphtha ratio of 4, circulation ratio of 2.25 and distribution ratio of 3.00. For the feed naphtha with the normal paraffin content of 31.95%, the content of normal paraffins in desorption oil reaches 87.76%, and the content of non-normal paraffins in the raffinate is 97.83%. Compared with the naphtha feed, the ethylene yield increases by 13.1 percentage points using the desorption oil as a steam cracking feed; RON and the potential aromatics content of the raffinate increases by 19.2% and by 10.2 percentage points, respectively.