A kind of hydrogenation method of diene
A diene, hydrogenation reaction technology, applied in the field of diene hydrogenation, can solve the problems of easy deactivation, short operation cycle, poor impurity resistance of the catalyst, etc., achieve good reaction performance, less loss of monoolefin, and reduce olefin The effect of aggregation
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Embodiment 1
[0041] Dissolve 1.2kg of zinc nitrate in 6L of water to make a solution containing zinc, and dissolve 0.24kg of sodium metaaluminate and 0.30kg of sodium carbonate in 4L of water to make a solution containing aluminum. Divide the zinc-containing solution into 3 equal parts, each 2L. Take 2L of zinc-containing solution, keep the temperature at 80°C, add aluminum-containing mixed solution dropwise to it until the pH value reaches 9.0; stop dropping the aluminum-containing mixed solution, then add 2L of zinc-containing solution dropwise to the mixing system, and continue to drop aluminum-containing solution Mix the solution until the pH value reaches 9.0; titrate the aluminum-containing mixed solution and the zinc-containing solution alternately until all the zinc-containing solutions are added, and add the aluminum-containing mixed solution dropwise until the pH reaches 9.0. The total titration time is 3 hours. The obtained mixture was aged at 80°C for 4h, cooled and washed unti...
Embodiment 2
[0053] The preparation method and steps of the composite carrier containing zinc oxide-alumina are the same as in Example 1, and the zinc oxide containing zinc-aluminum spinel is prepared, and the pH value is adjusted to 8.7. In terms of oxides, the content of zinc oxide is 70%; the specific surface area is 191m 2 / g.
[0054] The composite carrier includes 30wt% of zinc oxide containing zinc-aluminum spinel, 68wt% of alumina, and the contents of phosphorus, potassium and magnesium in the auxiliary components are P 2 o 5 0.6wt%, K 2 O 0.8wt%, MgO 0.6wt%.
[0055] The difference is that after the composite carrier is obtained, the composite carrier containing zinc oxide-alumina is modified by using potassium and magnesium. 1.2g, 10.7g of magnesium nitrate, completely dissolved in 30ml of distilled water, then diluted with deionized water to form a solution sprayed with a composite carrier of zinc oxide-alumina, dried and roasted to obtain surface-modified with additives po...
Embodiment 3
[0060] The preparation method and steps of the composite carrier containing zinc oxide-alumina are the same as in Example 1. Zinc oxide containing zinc aluminum spinel was prepared, and the pH value was adjusted to 9.3. Zinc oxide containing zinc aluminum spinel, calculated as oxide, the content of zinc oxide is 63%; the specific surface area is 214m 2 / g.
[0061] The composite carrier includes 18.3wt% of zinc oxide containing zinc-aluminum spinel, 79wt% of alumina, and the contents of phosphorus, potassium and magnesium in the auxiliary components are P 2 o 5 0.9wt%, K 2 O 0.8wt%, MgO 1.0wt%. Composite carrier specific surface area 242m 2 / g.
[0062] Take palladium chloride, chloroauric acid and lanthanum nitrate and add them to 30ml of distilled water, add ammonia water to adjust the pH value to 3.0, then dilute with deionized water, make an impregnation solution to impregnate 100g of spherical zinc oxide-alumina composite carriers, The obtained catalyst precursor ...
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