Catalyst for preparation of pyromellitic dianhydride from durene
A technology of durene and catalyst, which is applied in the field of homoanhydride synthesis, can solve the problems of low homoanhydride yield and high homoanhydride yield, and achieve the effect of improving activity and stability and increasing yield
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Embodiment 1
[0025] Weigh 93g of oxalic acid and 360ml of distilled water in a flask, stir and raise the temperature to 80°C, after the oxalic acid is completely dissolved, make an oxalic acid solution. Add 1 part of vanadium pentoxide to the prepared oxalic acid solution and continue stirring to obtain ammonium vanadyl oxalate solution. Add 2 parts of ferric nitrate and 0.4 part of zinc acetate into the solution, and continue stirring evenly to obtain a catalyst precursor. After the catalyst precursor is filtered and dried, it is loaded into a spraying machine and evenly sprayed on the inert carrier silicon carbide. The inert carrier sprayed with the catalyst precursor was baked in a muffle furnace at 540°C, and the catalyst was obtained after natural cooling. Catalyst at a reaction temperature of 510°C and a space velocity of 5200h -1 Next, it was evaluated in a fixed-bed reactor, and the average anhydride yield was measured to be 73.0%. The evaluation results are shown in Table 1.
Embodiment 2
[0027] Weigh 93g of oxalic acid and 360ml of distilled water in a flask, stir and raise the temperature to 80°C, after the oxalic acid is completely dissolved, make an oxalic acid solution. Add 1 part of vanadium pentoxide to the prepared oxalic acid solution and continue stirring to obtain ammonium vanadyl oxalate solution. Add 2 parts of ferric nitrate and 0.4 part of sodium nitrate into the solution, and continue stirring evenly to obtain a catalyst precursor. After the catalyst precursor is filtered and dried, it is loaded into a spraying machine and evenly sprayed on the inert carrier silicon carbide. The inert carrier sprayed with the catalyst precursor was baked in a muffle furnace at 540°C, and the catalyst was obtained after natural cooling. Catalyst at a reaction temperature of 510°C and a space velocity of 5200h -1 Next, it was evaluated in a fixed-bed reactor, and the average anhydride yield was measured to be 73.1%. The evaluation results are shown in Table 1. ...
Embodiment 3
[0032] Weigh 93g of oxalic acid and 360ml of distilled water in a flask, stir and raise the temperature to 80°C, after the oxalic acid is completely dissolved, make an oxalic acid solution. Add 1 part of vanadium pentoxide to the prepared oxalic acid solution and continue stirring to obtain ammonium vanadyl oxalate solution. Add 2 parts of cobalt oxide and 0.4 part of cadmium acetate into the solution, and continue stirring evenly to obtain a catalyst precursor. After the catalyst precursor is filtered and dried, it is loaded into a spraying machine and evenly sprayed on the inert carrier silicon carbide. The inert carrier sprayed with the catalyst precursor was baked in a muffle furnace at 540°C, and the catalyst was obtained after natural cooling. Catalyst at a reaction temperature of 510°C and a space velocity of 5200h -1Next, it was evaluated in a fixed bed reactor, and the average anhydride yield was measured to be 73.4%. The evaluation results are shown in Table 1.
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