Solid acid catalyst for preparing ethylene glycol by ethylene oxide hydration
A technology of ethylene oxide hydration and solid acid catalyst, which is applied in the direction of hydrolysis preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. Acid catalyst poor stability, high production cost and other problems, to achieve the effect of long life, high selectivity, no corrosion of equipment
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Embodiment 1
[0036] 6.3 grams of commercially available niobic acid are dissolved in hot oxalic acid solution (dissolved in 500 milliliters of water by 70 grams of oxalic acid and made), making niobic acid solution; 50 milliliters of 10% (weight) dilute nitric acid aqueous solution is prepared according to conventional methods. Weigh α-Al 2 o 3 Add 100 grams of carrier powder and 0.5 grams of germanium dioxide into the kneader, then add the niobic acid and nitric acid solution prepared above, and fully knead with the carrier in the kneader to form a lumpy material, which is extruded and formed. Dry at 150°C for 2 hours, and calcinate in air at 600°C for 4 hours to obtain catalyst A. The catalyst composition is shown in Table 1.
Embodiment 2
[0038] Dissolve 20 grams of commercially available niobium acetate in 40 milliliters of fumaric acid solution to make niobic acid solution; dissolve 3.6 grams of SnCl 2 2H 2 O is dissolved in concentration 10% (weight) in 15 milliliters of dilute hydrochloric acid solution, makes stannous chloride solution. Weigh Al 2 o 3 Powder 60g and SiO 2 40 grams of powder, mixed well, soaked in the above niobic acid solution for 2 hours, filtered off the solution, vacuum dried at 120°C for 2 hours, then soaked in stannous chloride solution for 2 hours, filtered, and vacuum dried at 120°C for 2 hours , and then add 70 grams of polyvinyl alcohol solution, and fully knead with the carrier in a kneader to form a lump material, extrusion molding, vacuum drying at 120 ° C for 2 hours, and roasting at 500 ° C for 4 hours in an ammonia atmosphere to obtain catalyst B . The catalyst composition is shown in Table 1.
Embodiment 3
[0040] 18.8 grams of niobic acid, 100 grams of ZrO 2 Add the carrier into the kneader and mix well, then add a certain amount of lead nitrate aqueous solution and 40 ml of dilute nitric acid binder with a concentration of 2% (weight), fully knead to form a doughy material, extrude, and dry at 100 ° C for 3 hours , Calcined in air at 200°C for 4 hours to obtain catalyst C. The catalyst composition is shown in Table 1.
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