Catalyst used for hydrating epoxy ethane to prepare ethandiol
A technology of ethylene oxide hydration and catalyst, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, hydroxyl addition preparation, etc. Acid catalyst poor stability, high reaction water ratio and other problems, to achieve the effect of long life, high selectivity, low operating water ratio
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Embodiment 1
[0039] Mix 113 grams of aluminum hydroxide raw powder, 5 grams of graphite, and 5 grams of sesame powder, and then add 60 milliliters of 4% (weight) dilute nitric acid, knead fully in a kneader to form a mass of material, and extrude it. , Dry at room temperature for 24 hours, 150°C for 2 hours, and 1200°C for 4 hours to obtain strip α-Al 2 O 3 Carrier. The oxalic acid solution containing 6.25 g of niobic acid was impregnated on the prepared carrier and dried at 120°C for 2 hours; then ammonium metavanadate was dissolved in 5% (weight) hydrogen peroxide, and then impregnated on the catalyst again, and dried at 120°C 2 Hours; Finally, the lanthanum trichloride aqueous solution was impregnated on the catalyst and dried at 120°C for 2 hours. The above catalyst precursor was calcined in air at 700°C for 4 hours to obtain catalyst A. The catalyst composition is shown in Table 1.
Embodiment 2
[0041] Mix 67.6 g of aluminum hydroxide, 40 g of silica, 8 g of graphite, and 4 g of cyclodextrin thoroughly, then add 60 ml of 4% (weight) dilute nitric acid and knead it in a kneader to form a mass , Extruded into a strip, dried at 150°C for 2 hours, and calcined at 1400°C for 4 hours to obtain a strip carrier. Impregnate the above-mentioned carrier with a certain amount of ammonium molybdate solution with a concentration of 125 mmol / L at room temperature. The solid volume ratio of the impregnating liquid is 2:1, soak for 2 hours, filter off the solution, and vacuum dry at 120°C for 2 hours; 15% ammonium niobium complex solution (NH 4 [NbO(C 2 O 4 ) 2 (H 2 O) 2 ]·(H 2 O) n ) Continue to immerse the carrier after the above treatment at room temperature. The solid volume ratio of the immersion liquid is 2:1, the immersion time is 2 hours, the solution is filtered off, and the solution is vacuum dried at 120°C for 2 hours, so that the immersion is performed three times; then a cert...
Embodiment 3
[0043] Mix 40.5 grams of commercially available niobium oxalate, 15 grams of polyvinyl alcohol, 8 grams of precipitated sulfur, the required ammonium tungstate and 100 grams of titanium dioxide to obtain a mixture, then add an appropriate amount of water and knead it in a kneader to form The mass is extruded and dried at 200°C for 3 hours, and then the praseodymium trichloride solution with a concentration of 0.12 mol / L is impregnated into the catalyst, dried at 150°C for 2 hours, and calcined in a carbon dioxide atmosphere at 400°C. 4 Hours, catalyst C was obtained. The catalyst composition is shown in Table 1.
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