Aromatic hydrocarbon catalytic vapor phase oxidation is become the catalyst of aldehyde, carboxylic acid and/or carboxylic acid anhydrides, particularly phthalic anhydride

Aromatic hydrocarbon catalytic vapor phase oxidation is become the catalyst of aldehyde, carboxylic acid and/or carboxylic acid anhydrides, particularly phthalic anhydride

  • CN 101,939,104 B
  • Filed: 01/28/2009
  • Issued: 06/01/2016
  • Est. Priority Date: 02/01/2008
  • Status: Active Grant
First Claim
Patent Images

1. for aromatic hydrocarbon catalytic vapor phase oxidation being become the catalyst of aldehyde, carboxylic acid and/or carboxylic acid anhydrides, this catalyst has multiple different catalyst layer, wherein, this catalyst has hot spot catalyst layer and at least one is placed in the catalyst layer before this hot spot catalyst layer, the highest local temperature extreme value based on whole catalyst comes across in this hot spot catalyst layer, it is characterized in thatThe catalytic active substance of this hot spot catalyst layer has stibium oxide, stibium oxide content in the catalytic active substance of the catalyst layer that at least one of which is preposition reduces 20 weight % to 100 weight % relative to the stibium oxide content in the catalytic active substance of hot spot Catalytic LayerDescribed have stibium oxide content to reduce the phosphorus content that at least one preposition catalyst layer of 20 weight % to 100 weight % has be 0 weight % to 0.3 weight %, relative to the catalytic active substance of this catalyst layer,The activity substance content of hot spot catalyst layer is 5 weight % to 15 weight %, and wherein, catalytic active substance containsThe vanadium oxide of 3 weight % to 12 weight %, with V2O5Calculate,The stibium oxide of 1 weight % to 3.5 weight %, with Sb2O3Calculate,The alkali of 0 weight % to 0.8 weight %, calculates with alkali metal,The phosphorus of 0 weight % to 0.6 weight %, calculates with P,The bismuth of 0 weight % to 4.0 weight %, calculates with Bi,The niobium oxide of 0 weight % to 4 weight %, with Nb2O5Calculate,The silver of 0 weight % to 5.0 weight %, calculates with Ag,Wherein, remaining as titanium dioxide, andAt least one catalyst layer is upwards placed in side, gas access to be had in whole catalyst before the hot spot catalyst layer of the highest local temperature extreme value, wherein,A) in the situation of the preposition catalyst layer of only one, stibium oxide content relative to the catalytic active substance of hot spot catalyst layer, the stibium oxide content of the catalytic active substance of this preposition catalyst layer reduces 20 weight % to 100 weight %, wherein the activity of the catalyst layer that this only one is preposition is less than the activity of hot spot catalyst layerOrB) in the situation of multiple preposition catalyst layers, stibium oxide content relative to the catalytic active substance of hot spot catalyst layer, in these preposition catalyst layers, the stibium oxide content of at least one of catalytic active substance reduces the value set in advance of 20 weight % to 100 weight %, and wherein this has stibium oxide content and reduces activity that at least one preposition catalyst layer of 20 weight % to 100 weight % the has activity less than hot spot catalyst layer.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×