Process and device for improved separation of paraxylene in a simulated moving bed

Process and device for improved separation of paraxylene in a simulated moving bed

  • CN 104,892,338 A
  • Filed: 06/24/2008
  • Published: 09/09/2015
  • Est. Priority Date: 07/30/2007
  • Status: Active Application
First Claim
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1. for by direct separation in simulation moving-bed device (being simply expressed as SMB) in single simulated moving bed adsorption step from substantially have 8 carbon atoms aromatic hydrocarbon feed F separation purity be at least the method for the p-Xylol of 99.5 % by weight, this simulation moving-bed device has at least one and comprises multiple distribution/extraction plate P ithe tower of the adsorption bed separated, wherein at least one feed F and a kind of strippant D is supplied in this device, extract extract E and at least one raffinate R that at least one is rich in p-Xylol out, wherein this supply and extraction point change in time, switching time is T, and determine the operating area quantity, particularly following main region of this simulation moving-bed (SMB) tower:

  • The region 1 for this p-Xylol of desorb between the supply and the extraction of extract E of strippant D;

    The region 2 of the compound for this raffinate of desorb between the extraction and the supply of feed F of extract E;

    The region 3 for adsorbing at least p-Xylol between the supply and the extraction of raffinate R of feed;

    Region 4 between the extraction and the supply of strippant D of raffinate R,Wherein the method is carried out according to area configurations (a, b, c, d), simultaneously;

    The quantity of the adsorption bed that a=operates in zone 1;

    The quantity of the adsorption bed that b=operates in region 2;

    The quantity of the adsorption bed that c=operates in area 3;

    The quantity of the adsorption bed that d=operates in region 4;

    Below the method is implemented;

    Use the SMB of 19 adsorption beds operated according to configuration (4,7,6,2), wherein strippant is p-Diethylbenzene.

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