Process for preparing ethylene glycol by ethylene oxide catalytic hydration
A technology for catalytic hydration of ethylene oxide and ethylene oxide, which is applied in the preparation of hydroxyl compounds, the preparation of organic compounds, chemical instruments and methods, etc. Pollution of the environment and other problems, to achieve the effects of excellent stability, high selectivity, and no pollution to the environment
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Embodiment 1
[0044] Dissolve 6.3 grams of commercially available niobic acid in a hot oxalic acid solution (prepared by dissolving 70 grams of oxalic acid in 500 ml of water) to prepare a niobic acid solution; prepare 50 ml of a 10% (weight) dilute nitric acid aqueous solution according to a conventional method. Weigh α-Al 2 O 3 100 grams of carrier powder and 0.5 grams of germanium dioxide are added to the kneader, and then the above-prepared niobic acid and nitric acid solution are added, and the carrier is fully kneaded in the kneader to form a lump material, which is extruded into It was dried at 150°C for 2 hours and calcined in air at 600°C for 4 hours to obtain catalyst A. According to the weight percentage of the carrier, the composition of catalyst A:
[0045] 5.0% Nb 2 O 5 -0.5%GeO 2 / α-Al 2 O 3 .
Embodiment 2
[0047] Dissolve 20 g of commercially available niobium acetate in 40 ml of fumaric acid solution to make a niobic acid solution; add 3.6 g of SnCl 2 ·2H 2 O was dissolved in 15 ml of dilute hydrochloric acid solution with a concentration of 10% by weight to prepare a stannous chloride solution. Weigh Al 2 O 3 Powder 60 grams and SiO 2 40 grams of powder, mixed thoroughly, first immerse in the above niobic acid solution for 2 hours, filter off the solution, vacuum dry at 120°C for 2 hours, then immerse in stannous chloride solution for 2 hours, filter, and vacuum dry at 120°C for 2 hours , And then add 70 grams of polyvinyl alcohol solution, fully kneaded with the carrier in a kneader to form a mass, extruded, dried in vacuum at 120°C for 2 hours, and calcined in an ammonia atmosphere at 500°C for 4 hours to obtain catalyst B . According to the weight percentage of the carrier, the composition of catalyst B: 10% Nb 2 O 5 -2.4% SnO 2 / 60% Al 2 O 3 +40%SiO 2 .
Embodiment 3
[0049] 18.8 grams of niobic acid, 100 grams of ZrO 2 The carrier is added to the kneader and mixed thoroughly, then a certain amount of lead nitrate aqueous solution and 40 ml of dilute nitric acid binder with a concentration of 2% (by weight) are added, fully kneaded to form a mass, extruded, and dried at 100°C for 3 hours , Calcined in air at 200°C for 4 hours to obtain catalyst C. According to the weight percentage of the carrier, the composition of catalyst C: 15% Nb 2 O 5 -1.0%PbO 2 / ZrO 2 .
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