A kind of pva by-product methyl acetate hydrogenation catalyst
A hydrogenation catalyst, methyl acetate technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, organic chemistry, etc., can solve the problems of serious pollution, poor economic benefits, and high energy consumption , to achieve high catalytic activity and selectivity, long service life and good stability
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Embodiment 1
[0032] Add 384g of nickel nitrate hexahydrate and 325.8g of zinc nitrate, add 398.3g of aluminum nitrate, add a certain amount of deionized water, stir well, add dropwise a certain concentration of sodium carbonate solution, co-precipitate, filter and wash, and dry at 100°C 10h. Calcined at 400° C. for 4 h in an air atmosphere to obtain a catalyst precursor.
[0033] 5.0 g of the above catalyst precursor was taken, and subjected to reduction activation at 350° C. for 4 h in pure hydrogen at normal pressure to obtain a reduced catalyst.
[0034] Using 75% methyl acetate and 25% methanol as raw materials, catalytic hydrogenation in a fixed-bed reactor, the reaction conditions are 180-250°C, 2-5.0M Pa, and the liquid space velocity of methyl acetate is 0.3h -1 , hydrogen air velocity 1000~1500h -1 , Sampling chromatographic analysis showed that the conversion rate of methyl acetate was 99.6%, and the selectivity of ethanol was 91.1%.
Embodiment 2
[0036] Copper nitrate 1181.1g and zinc nitrate 325.8g, add aluminum nitrate 398.3g, add a certain amount of deionized water, stir well, add dropwise a certain concentration of sodium carbonate solution, coprecipitate, filter and wash, and dry at 100°C for 10h . Calcined at 400° C. for 4 h in an air atmosphere to obtain a catalyst precursor.
[0037] Take 5.0 g of the above-mentioned catalyst precursor, and perform reduction activation for 4 hours at 250° C. in pure hydrogen at normal pressure to obtain a reduced catalyst.
[0038] Using 75% methyl acetate and 25% methanol as raw materials, catalytic hydrogenation in a fixed-bed reactor, the reaction conditions are 180-250°C, 3.0M Pa, and the liquid space velocity of methyl acetate is 0.3h -1 , hydrogen air velocity 1000~1500h -1 , Sampling chromatographic analysis, the conversion rate of methyl acetate is 95.6%, and the selectivity of ethanol is 98.5%.
Embodiment 3
[0040] Copper nitrate 1181.1g, nickel nitrate 384g, zinc nitrate 325.8g, add aluminum nitrate 398.3g, add a certain amount of deionized water, stir well, add a certain concentration of sodium carbonate solution dropwise, co-precipitate, filter and wash, at 100 ℃ Next, dry for 10h. Calcined at 400° C. for 4 h in an air atmosphere to obtain a catalyst precursor.
[0041] 5.0 g of the above catalyst precursor was taken, and subjected to reduction activation at 280° C. for 4 h in pure hydrogen at normal pressure to obtain a reduced catalyst.
[0042] Using 75% methyl acetate and 25% methanol as raw materials, catalytic hydrogenation in a fixed-bed reactor, the reaction conditions are 180-250°C, 3.0M Pa, and the liquid space velocity of methyl acetate is 0.3h -1, hydrogen air velocity 1000~1500h -1 , Sampling chromatographic analysis, the conversion rate of methyl acetate is 99.1%, and the selectivity of ethanol is 99.1%.
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