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Method for preparing cyclohexane by hydrogenating benzene

A technology for hydrogenation of benzene and cyclohexane, which is applied in the fields of hydrogenation to hydrocarbon production, chemical instruments and methods, organic compounds/hydrides/coordination complex catalysts, etc., can solve problems such as the influence of hydrogenation effect and the like

Active Publication Date: 2012-04-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the adaptability of the reaction system to water or water content fluctuations in the current process of hydrogenation of benzene to cyclohexane and the two requirements for inhibiting the formation of carbon deposits, the inventor proposed a method for the hydrogenation of benzene to prepare cyclohexane method, under the premise of ensuring that the benzene hydrogenation catalyst has good activity and selectivity, it can effectively solve the problem that the water content or fluctuation of water content in the reaction system affects the hydrogenation effect of the benzene hydrogenation catalyst, and at the same time effectively inhibit Formation of carbon on the surface of the catalyst

Method used

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  • Method for preparing cyclohexane by hydrogenating benzene
  • Method for preparing cyclohexane by hydrogenating benzene
  • Method for preparing cyclohexane by hydrogenating benzene

Examples

Experimental program
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Effect test

Embodiment 1

[0046] This example illustrates the preparation of the hydrogenation catalyst used in the process of the invention.

[0047] 1) Weigh 50.0 g of alumina carrier, impregnate with 35 ml of aqueous solution containing 0.90 g of potassium nitrate for 0.5 h by equal-volume impregnation method, dry at 120 °C for 4 h, and roast at 550 °C for 6 h;

[0048] 2) Then impregnate with an aqueous solution containing 50.1g of nickel nitrate in two steps by equal-volume impregnation, dry at 120°C for 4h, roast at 450°C for 6h, and reduce in a hydrogen atmosphere at 400°C for 20h;

[0049] 3) Silylation treatment with methyltriethoxysilane at 120° C. for 1.5 h to obtain catalyst A-1. See Table 1 for the catalyst composition.

Embodiment 2

[0051] This example illustrates the preparation of the hydrogenation catalyst used in the process of the invention.

[0052] 1) Weigh 50 g of alumina carrier, impregnate with 35 ml of aqueous solution containing 2.43 g of magnesium nitrate by equal volume impregnation method for 0.5 h, dry at 120 °C for 4 h, and roast at 550 °C for 6 h;

[0053] 2) Then impregnate with an aqueous solution containing 120.4g of nickel nitrate in two steps using an equal-volume impregnation method for 0.5h, dry at 120°C for 4h, roast at 450°C for 6h, and reduce in a hydrogen atmosphere at 400°C for 20h;

[0054] 3) Silylation treatment with methyltriethoxysilane at 120° C. for 1.5 h to obtain catalyst A-2. See Table 1 for the catalyst composition.

Embodiment 3

[0056] This example illustrates the preparation of the hydrogenation catalyst used in the process of the invention.

[0057] 1) Weigh 50.0 g of alumina carrier, impregnate with 35 ml aqueous solution containing 1.82 g of cerium nitrate for 0.5 h by equal-volume impregnation method, dry at 120 °C for 4 h, and roast at 550 °C for 6 h;

[0058] 2) Then impregnate with an aqueous solution containing 50.0 g of nickel nitrate in two steps using an equal-volume impregnation method for 0.5 h, dry at 120 ° C for 4 h, roast at 450 ° C for 6 h, and reduce in a hydrogen atmosphere at 400 ° C for 20 h;

[0059] 3) Silylation treatment with methyltriethoxysilane at 120° C. for 1.5 h to obtain catalyst A-3. See Table 1 for the catalyst composition.

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Abstract

The invention relates to a method for preparing cyclohexane by hydrogenating benzene. According to the requirements of adaptability to water content fluctuation of a reaction system and inhibition of carbon deposit in the process of hydrogenating the benzene at present, hydrogen / benzene mixed gas in a certain molar ratio is introduced into a reactor and contacted with a benzene hydrogenation catalyst to prepare the cyclohexane at the inlet temperature of between 100 and 320 DEG C under the reaction pressure of 0.1 to 4.0MPa, wherein the hydrogenation catalyst comprises a carrier, metal active ingredients and a silane group which is grafted by silylation and accounts for 0.1 to 15 weight percent of the catalyst. Compared with the prior art, the method has the advantages that: the method is high in raw material applicability on the premise of ensuring that the benzene hydrogenation catalyst has high activity and selectivity, and the catalytic performance of the benzene hydrogenation catalyst is almost not influenced by trace water; meanwhile, the carbon deposit on the surface of the catalyst can be obviously inhibited, the service life of the catalyst is prolonged, and the catalyst has a long stable operation period.

Description

technical field [0001] The present invention relates to a hydrogenation method, more specifically, the present invention relates to a method for preparing cyclohexane by hydrogenation of benzene. Background technique [0002] Cyclohexane is an important organic chemical raw material. It is colorless, easy to flow, and has a pungent odor. It is mainly used in the production of cyclohexanol, cyclohexanone, caprolactam, hexamethylenediamine and adipyl, and can dissolve a variety of organic substances. It is less toxic than benzene. It is cellulose Excellent solvent for ethers, resins, waxes, greases, asphalt and rubber. More than 90% of cyclohexane is prepared by hydrogenation of benzene, and its production technology is relatively mature. Commonly used catalysts include nickel-based, platinum-based and palladium-based, among which nickel-aluminum catalysts have better activity and relative It is widely used in existing industrial devices due to its low price. As introduced ...

Claims

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Application Information

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IPC IPC(8): C07C13/18C07C5/10B01J31/28
Inventor 唐国旗田保亮黄龙彭晖戴伟
Owner CHINA PETROLEUM & CHEM CORP
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