Preparation of tephthalyl intrile
A technology of terephthalonitrile and p-xylene, applied in the field of ammoxidation of p-xylene to prepare terephthalonitrile, which can solve the reactor engineering amplification effect, high yield of terephthalonitrile, and reactor engineering amplification and other problems, to achieve good reaction stability, improve reaction selectivity, and enhance the effect of oxygen adsorption capacity
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[0046] [Example 1]
[0047] Catalyst preparation:
[0048] 224 g V 2 O 5 Add 490 ml of water and 468 g of oxalic acid to a solution at a temperature of 80-90° C., stir thoroughly, and react to obtain a vanadium oxalate solution.
[0049] Set the concentration to 40% SiO 2 1250 grams of silica sol was slowly added to the above solution under stirring, and then 935 grams of Cr(NO 3 ) 3 ·9H 2 A solution of O and 300 ml of water, 76.3 g of H 3 BO 3 And 560 ml of water and 28.4 g of 85% H 3 PO 4 And 50 ml of water, then add 190 g of 30% (weight) TiCl 3 Hydrochloric acid solution, and containing 12.5 grams of KNO 3 And 88 grams of Mn(NO 3 ) 2 Stir 300 grams of the aqueous solution, heat and evaporate to a solid content of 40% (weight) to obtain a viscous slurry.
[0050] The catalyst formed by spray drying the slurry was dried at 120°C for 12 hours and calcined at 650°C for 5 hours to obtain catalyst composition V 1.00 Cr 0.95 Ti 0.15 B 0.50 P 0.10 Mn 0.2 K 0.05 / SiO 2 , The catalyst main...
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[0057] [Examples 2~4]
[0058] Using the same catalyst preparation method and evaluation conditions as in Example 1 above, a catalyst was prepared by changing the composition of the catalyst. The evaluation results are shown in Table 1.
[0059] Example
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[0060] [Example 5]
[0061] The catalyst was prepared according to the steps of Example 1, and the evaluation conditions were changed as follows:
[0062] Paraxylene: NH 3 : Air = 1:5:50 (mole), catalyst weight load (WWH) 0.10 hours -1 , The reaction temperature is 430℃, the reaction pressure is 0.01MPa, and the reaction results are as follows:
[0063] Conversion rate of p-xylene 98.4%
[0064] Selectivity to terephthalonitrile 91.7%
[0065] The yield of terephthalonitrile 90.2%
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