Hydrogenation catalyst and application thereof

A technology of catalysts and additives, applied in the field of nickel-based catalysts, can solve the problems of catalyst nickel grain growth, overheating, catalyst activity and selectivity reduction, etc.

Active Publication Date: 2013-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because in the process of reducing the oxide to metallic nickel in the nickel catalyst, the exothermic heat is severe (nickel oxide is reduced to metallic nickel), which will lead to the so-called "flying temperature". Decreased activity and selectivity, or even scrapped
At the same time, the reduction and activation temperature of existing nickel catalysts generally need

Method used

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  • Hydrogenation catalyst and application thereof
  • Hydrogenation catalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Get nickel nitrate trihydrate (133g), zinc nitrate hexahydrate (145g) and ammonium dimolybdate (25g), add in 2000ml water, be dissolved into solution after stirring, above-mentioned solution and sodium carbonate solution are carried out concurrent precipitation, precipitation temperature is 75-80°C, the pH value of the precipitation is controlled between 7-7.5, after the precipitation is completed, add pseudo-boehmite and age at 90°C for 3 hours, wash the precipitate until it is free of sodium ions, and then add it to the precipitate filter cake 30 g of magnesium nitrate aqueous solution (containing 5 g of magnesium nitrate), the resulting filter cake was dried at 90° C. overnight, then roasted, and then shaped after adding 5.0 g of hydrotalcite. The shaped catalyst particles are reduced in hydrogen, and the reduced catalyst is fed with nitrogen containing a small amount of oxygen as a passivating agent until there is no temperature rise in the reduction reactor. The ze...

Embodiment 2

[0039] After getting nickel nitrate trihydrate (179g), zinc nitrate hexahydrate (130g) and 40% manganese nitrate aqueous solution (40g) and fully stirring, add silica sol 100g containing 15 grams of silicon dioxide and continue to stir until viscous, then add Add 5g of graphite, 10g of water and 20g of methylcellulose, continue to stir until it forms a dough, add 5g of potassium nitrate, continue to stir for 10 minutes, then dry the resulting dough at 120°C for 2 hours and bake at 400°C for 4 hours. The catalyst particles obtained by molding are reduced in hydrogen, and nitrogen containing water vapor as a passivating agent is first introduced into the reduced catalyst, followed by nitrogen containing a small amount of oxygen, and finally air, until the reduction reactor has no temperature rise . by H 2 - The percentage of zero-valent nickel in the total nickel content measured by TPR is 92%, such as figure 1 .

Embodiment 3

[0045] The catalysts of Examples and Comparative Examples are all applied to hydrogenation of acetone, the catalyst loading is 50ml, and the volume space velocity of acetone is 0.6h -1 , the molar ratio of oxygen to acetone is 3. The reaction results are shown in the table below:

[0046]

[0047] Calculation method of maximum temperature out of control: maximum temperature = cumulative heat release of reduction / specific heat value of catalyst X 0.9, 0.9 is assumed heat dissipation coefficient.

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Abstract

The invention relates to a composition and an application of a hydrogenation catalyst. The catalyst at least comprises nickel, zinc oxide, an auxiliary agent one, an auxiliary agent two, an auxiliary agent three, and an auxiliary agent four. The catalyst is mainly composed of nickel and zinc oxide. Nickel is in an oxidation state, a metal state, or a mixture of various valence states. Zero-valence nickel in the catalyst accounts for 50-98mol% of nickel in the catalyst. The auxiliary agent one is one or more selected from manganese oxide and molybdenum oxide. The auxiliary agent two is one or more selected from potassium hydroxide, magnesium oxide and calcium oxide. The auxiliary agent three is one or more selected from alumina or silicon oxide. The auxiliary agent four is one or more selected from graphite, talcum powder or stearate. With the catalyst, a yield of low-carbon hydrocarbon is low; hydrogen consumption is low; a heavy component yield is low; and product separation process is simplified. Reduction control of the catalyst is simple, and machine is easy to start.

Description

technical field [0001] The invention relates to a nickel-based catalyst and its application in the production of alcohols, more specifically, a nickel-based catalyst which is easy to control reduction and contains various auxiliary agents, and its application in the hydrogenation of ketones to produce alcohols in the application. Background technique [0002] Isopropanol, also known as secondary propanol and dimethylmethanol, has a wide range of uses. It is mainly used as an organic solvent in the fields of inks and coatings, and also has important applications in medicine, organic chemical raw materials, and the electronics industry. [0003] At present, there are two technical routes for the production of isopropanol in the domestic industry: the first is the hydration of propylene to produce isopropanol; the second is the hydrogenation of acetone to produce isopropanol. Among them, the propylene hydration method is divided into indirect hydration method and direct hydrat...

Claims

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Application Information

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IPC IPC(8): B01J23/887B01J23/889C07C29/145C07C31/10
Inventor 田保亮黄龙张桂英李宝芹唐国旗杨溢彭晖戴伟
Owner CHINA PETROLEUM & CHEM CORP
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