Solid acid catalyst for hydration of epoxy ethane to produce ethandiol
A technology of ethylene oxide hydration and solid acid catalyst, which is applied in the direction of molecular sieve catalyst, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. Acid catalyst poor stability, environmental pollution and other problems, to achieve excellent reaction performance, excellent stability, high selectivity effect
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Embodiment 1
[0040] 10 grams of niobate, 0.05 grams of germanium dioxide and 100 grams of α-Al 2 O 3 Mix well in a kneader, then add 50 ml of dilute nitric acid with a concentration of 1% by weight and 8.8 ml of an aqueous solution of chromium (III) nitrate with a concentration of 0.03% by weight, knead to form a mass, extrude into strips, and dry at 100 ° C Catalyst A was obtained by calcining in air at 300°C for 2 hours for 4 hours. The catalyst composition is shown in Table 1.
Embodiment 2
[0042] Add 60 grams of alumina and 40 grams of silicon dioxide into the kneader, mix evenly, then add 60 ml of dilute nitric acid with a concentration of 2% by weight, knead to form a mass material, extrude into strips, and dry at 150 ° C for 2 1400 ℃ roasting for 4 hours to make a bar-shaped carrier, pulverize the carrier, impregnate the above-mentioned carrier with a certain amount of ammonium molybdate aqueous solution with a concentration of 125 mmol / L at room temperature, the immersion liquid solid volume ratio is 2:1, and the impregnation is carried out. After 2 hours, the solution was filtered off and vacuum dried at 120°C for 2 hours; 12.5 g of niobic acid, 3.15 g of SnCl were weighed 2 ·2H 2 O is fully mixed with the carrier impregnated with molybdenum, 70 ml of binder polyvinyl alcohol solution is added, and after kneading and extruding, vacuum drying at 120 ° C for 2 hours, and calcination in 400 ° C ammonia atmosphere for 4 hours to obtain catalyst B . The cataly...
Embodiment 3
[0044] Add 20.2 g of niobium oxalate and 100 g of SAPO-34 into the kneader, then add 55 ml of aluminum sol with a concentration of 10% by weight, knead to form a mass, extrude into strips, and dry at 100 ° C for 2 hours at 600 °C. calcined at °C for 4 hours to form a strip-shaped carrier. The catalyst precursor was vacuum impregnated with a certain concentration of 25 mmol / L ammonium tungstate solution with a liquid-solid volume ratio of 2:1, impregnated for 2 hours, the solution was filtered off, and dried at 120° C. for 2 hours to obtain mixture 1. Dissolve a certain amount of lead nitrate in water to make an aqueous solution and impregnate it on the mixture 1, the volume ratio of the impregnating liquid to solid is 1.5:1, the impregnation time is 2 hours, the solution is filtered off, dried again at 120 ° C for 2 hours, in the air at 400 ° C After calcination for 2 hours, catalyst C was obtained. The catalyst composition is shown in Table 1.
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