Catalyst for preparing isophthalodinitrile and preparation method and use thereof
A technology of isophthalonitrile and catalyst, applied in the field of catalyst for preparing isophthalonitrile and its preparation and application, can solve the problems of poor catalyst activity, poor selectivity, low conversion rate, etc., and reduce the cost of raw materials , less ammonia consumption and strong adsorption capacity
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Embodiment 1
[0043] Catalyst preparation
[0044] First put 2.8g of V 2 o 5 and 1.05gCrO 3 Add them together to 250ml distilled water containing 20g oxalic acid, heat and dissolve at about 343K to make a dark blue solution. Then add 0.15g of KCl, 1.25g of P 2 o 5 , 1.00g (NH 4 ) 6 Mo 7 o 24 4H 2 O, 2.00g NiCl 2 ·6H 2O and other substances, stirred to make a transparent solution of the active substance. Add 100 g of dried 120-mesh spherical silica gel to the above solution, stir evenly, dry at 373K, and then activate at 813K for 6 hours to obtain the required catalyst.
[0045] Ammoxidation of m-xylene
[0046] In a steel pipe with an internal diameter of 40mm, add 90g of catalyst prepared by the method described in this example, heat up to 643K, and press m-xylene: ammonia: oxygen (converted by air) = 1: 2.5: 10 in the amount of substance ratio The reaction mixture is sent into the reactor, the conversion rate of m-xylene is 99.6%, and the mass yield of isophthalonitrile is 9...
Embodiment 2
[0048] Catalyst preparation
[0049] Put 2.80g of V 2 o 5 and 1.05g of CrO 3 Add them together to 250ml distilled water containing 20g oxalic acid, heat and dissolve at about 343K to make a dark blue solution, then add 0.16g NaCl, 1.10g P 2 o 5 , 1.04g (NH 4 ) 6 Mo 7 o 24 4H 2 O, 2.10 g NiCl 2 ·6H 2 O, dissolve evenly and make a transparent solution. Add 100 g of dried 80-mesh spherical silica gel (same example 1) into the transparent solution, stir evenly, dry at 373K, and activate at 813K for 6 hours to obtain the desired catalyst.
[0050] Ammoxidation of m-xylene
[0051] In the reactor described in Example 1, add 90 g of catalysts prepared by the method described in this example, maintain the temperature of the catalyst bed at 643K, press m-xylene: ammonia: oxygen (converted by air)=1: 6: 16 The amount ratio of the substance is to send the reaction mixture into the reactor, the conversion rate of m-xylene is 98.9%, and the mass yield of isophthalonitrile is 9...
Embodiment 3
[0053] Catalyst preparation
[0054] Put 2.80g of V 2 o 5 and 1.16g of CrO 3 Add them together to 250ml distilled water containing 20g oxalic acid, heat and dissolve at about 343K to make a dark blue solution, then add 0.17g NaCl, 1.18g P 2 o 5 , 0.85g (NH 4 ) 6 Mo 7 o 24 4H 2 O, 2.46g NiCl 2 ·6H 2 O, dissolve evenly and make a transparent solution. Add 100 g of dried 40-mesh spherical silica gel (same example 1) into the transparent solution, stir evenly, dry at 373K, and activate at 813K for 6 hours to obtain the desired catalyst.
[0055] Ammoxidation of m-xylene
[0056] In the reactor described in Example 1, add 90 g of the catalyst prepared by the method described in this example, maintain the temperature of the catalyst bed at 643K, press m-xylene: ammonia: oxygen (converted by air)=1: 1.2: 4 The amount ratio of the substance is to send the reaction mixture into the reactor, the conversion rate of m-xylene is 98.7%, and the mass yield of isophthalonitrile i...
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