Isomerization of ethylbenzene and xylenes

Isomerization of ethylbenzene and xylenes

  • CN 1,774,409 A
  • Filed: 03/17/2004
  • Published: 05/17/2006
  • Est. Priority Date: 04/16/2003
  • Status: Active Application
First Claim
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1. , a kind of the raw material that comprises ethylbenzene and xylene different structure mixture is carried out isomerized method, described method comprises:

  • (a) under the xylene isomerization condition, described raw material is contacted with first catalyst composition, compare intermediate product with preparation with raw material, then with higher p-Xylol concentration(b) under the ethylbenzene isomerization condition, make to the described intermediate product of small part and contact with second catalyst composition, this second catalyst composition comprises the hydrogenation-dehydrogenation component and has the molecular sieve in 10 yuan of annular distance cracks, under described ethylbenzene isomerization condition, described second catalyst composition will turn to p-Xylol to small part ethylbenzene selectivity isomery in the intermediate product effectively, thereby make further product, and the p-Xylol concentration of this product is greater than the p-Xylol equilibrium concentration under the described ethylbenzene isomerization condition.

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