Method for producing cyclohexane through benzene hydrogenation

A technology for the hydrogenation of benzene and cyclohexane, which is applied in the production of bulk chemicals, chemical instruments and methods, hydrogenation to hydrocarbons, etc., can solve the problem of less industrial application of platinum-based catalysts, reduce the hydrothermal treatment process, and achieve mild reaction conditions , the effect of large specific surface area

Inactive Publication Date: 2017-07-07
QINZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Nickel series catalysts are widely used, but the industrial application of platinum series catalysts is less, so the present invention mainly provides a method for producing cyclohexane by hydrogenation of benzene with platinum series catalysts

Method used

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  • Method for producing cyclohexane through benzene hydrogenation

Examples

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Embodiment 1

[0034]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 until...

Embodiment 2

[0046] 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.

[0047] The composite carrier includes 30wt% of zinc oxide containing zinc-aluminum spinel, 67wt% 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 1.6wt%.

[0048] The difference is that after the composite carrier is obtained, the composite carrier containing zinc oxide-alumina is modified by using potassium and magnesium. , magnesium nitrate, completely dissolved in 30ml of distilled water, then diluted with deionized water, made into a solution and sprayed with a composite carrier of zinc oxide-alumina, so that the content of potassium and magnesium on the outside of the...

Embodiment 3

[0053] 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.

[0054] The composite carrier includes 18.3wt% of zinc oxide containing zinc-aluminum spinel, 77.5wt% 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 3.5wt%. Composite carrier specific surface area 242m 2 / g.

[0055] Take 2.28g of chloroplatinic acid and 1.62g of palladium 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 impregnating solution to impregnate 100g of spherical zinc oxide-alumina composite carriers, The obtained catalyst precurs...

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Abstract

The invention discloses a method for producing cyclohexane through benzene hydrogenation. A catalyst contains the following components in the mass of oxides: 80-99wt% of a composite support containing zinc oxide-aluminum oxide, 0.1-5wt% of an active component platinum oxide and 0.1-5wt% of an active component palladium oxide; and the catalyst has high benzene hydrogenation activity, low loss rate of a precious metal active component and long running period.

Description

technical field [0001] The invention relates to a method for hydrogenating benzene to produce cyclohexane, more specifically, using a benzene hydrogenation catalyst with a zinc oxide-alumina composite material as a carrier for the hydrogenation of benzene to produce cyclohexane. Background technique [0002] One of the main raw materials for the production of caprolactam is cyclohexane, which is mainly prepared by hydrogenation of benzene, accounting for about 90%, in addition to fractionation of naphtha and isomerization of methylcyclopentane. As caprolactam is widely used and its demand is increasing, the production of its main raw material, cyclohexane, is becoming more and more important. [0003] The production process of benzene hydrogenation to prepare cyclohexane mainly includes gas-solid fixed bed and gas-liquid-solid three-phase suspended bed reaction system. The fixed bed gas-solid reaction system is widely used, and it is mainly suitable for nickel-based catalyst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/10C07C13/18B01J27/185B01J35/10
CPCB01J27/1856B01J35/1019C07C5/10C07C13/18Y02P20/52
Inventor 晁会霞罗祥生颜曦明
Owner QINZHOU UNIV
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