Double-layer catalyst and preparation thereof, and application of catalyst in preparation of pyromellitic dianhydride
A double-layer catalyst and catalyst technology, applied in the direction of physical/chemical process catalysts, organic chemistry, chemical instruments and methods, etc., can solve the problems of many impurities, heavy color, unsatisfactory, etc., and meet the requirements of easy reaction conditions, light color, and low effect
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Embodiment 1
[0039] Catalyst E 8 preparation of
[0040] Heat 500ml of deionized water to 60-80°C to dissolve 96.9g of oxalic acid, add 44.858g of ammonium metavanadate to dissolve, then add 0.592g of sodium carbonate, 1.38g of ammonium dihydrogen phosphate, and 0.353g of ammonium molybdate (molybdenum is used as other elements) All dissolved, and finally 67.805 g of anatase titanium dioxide and 6 g of whiskers were added to prepare a slurry. At 200-300°C, spray the slurry onto a 600g ring carrier (6mm×6mm×3mm in size). The roasting furnace is evenly heated to 520°C in no less than 3 hours, the sprayed annular carrier is put into the roasting furnace for 5 hours, and the catalyst E is obtained after natural cooling. 8 , The active ingredient load is greater than 10g / 100g carrier.
[0041] Catalyst E 12 preparation of
[0042] Heat 500ml of deionized water at 60-80°C to dissolve 96.9g of oxalic acid, first add 44.858g of ammonium metavanadate to dissolve, then add 0.592g of sodium carb...
Embodiment 2
[0049] Catalyst E prepared in embodiment 1 is loaded into the small test reaction tube of internal diameter 26mm 12 , Catalyst G 13 , Catalyst E 12 Installed at the outlet of the reaction gas, the filling height is 130mm; Catalyst G 13 It is installed at the inlet end of the raw material mixture, and the filling height is 75mm. The operating conditions are: feed gas concentration 17.5g / Nm 3 , the reaction temperature is 410-425°C, and the space velocity is 4500hr -1 . The crude average anhydride product is lighter in color. Crude anhydride weight yield 103.5%, illustrate that the selectivity of this catalyst is better. The content of homoanhydride was analyzed by gas chromatography to be 97.64%, indicating that the purity of homoanhydride is relatively high.
Embodiment 3
[0051] Catalyst E prepared by embodiment 1 8 and Catalyst G 4 Single-tube tests are performed in stacks. The single tube reactor has a length of 3.6m and an inner diameter of 29mm. Catalyst E 8 Installed at the outlet of reaction gas, bed height 1300mm, catalyst G 4 Installed at the inlet and outlet of raw gas, the bed height is 750mm. Add an inert isolation layer of 20cm between the two catalysts (the specification is 6mm×6mm×3mm ceramic ring). The concentration of raw material mixture is 17.5-19.8g / Nm 3 , the reaction temperature is 410-420°C, and the space velocity is 4300-4500hr -1 . After 896 hours of continuous operation, the color of the crude homoanhydride product is relatively light, and the yield of crude anhydride is 95.6-98.7%, which shows that the catalyst has good selectivity. After a single-tube test, it can enter industrial trial production. The content of homoanhydride is 97.5-99.9% through gas chromatography analysis, indicating that the purity of hom...
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