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Method for preparing cyclohexane by hydrogenating benzene

A technology for hydrogenation of cyclohexane and benzene, which is applied in the fields of hydrogenation to hydrocarbons, organic chemistry, etc.

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the traditional method of benzene hydrogenation to prepare cyclohexane is difficult to control the temperature and is prone to "flying temperature", the inventor proposes a new method of benzene hydrogenation to prepare cyclohexane

Method used

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  • Method for preparing cyclohexane by hydrogenating benzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Preparation of cyclohexane catalyst by hydrogenation of cobalt-based benzene at low temperature

[0034] 146g Co(NO 3 ) 2 ·6H 2 O was dissolved in 60 mL deionized water and loaded onto 70 g SiO by impregnation 2 Carrier (commercially available), baked at 110°C for 12 hours, and calcined at 500°C for 6h to obtain the catalyst before reduction.

[0035] 2. Evaluation of the catalyst for the low temperature hydrogenation of cobalt-based benzene to prepare cyclohexane in the first reactor.

[0036] Put 0.2 g of the above catalyst in a fixed-bed micro-reactor, and reduce it with hydrogen-nitrogen mixed gas at 500° C. for 2 h, and the flow rates of hydrogen and nitrogen are both 30 mL / min. The cobalt metal content of the catalyst after reduction was 29.6% by weight.

[0037] Feed reaction gas into the above reactor, including hydrogen 10mL / min, nitrogen 40mL / min, benzene is injected by a micropump, flow rate 0.5mL / h, brought into the catalyst layer bed in the reaction...

Embodiment 2

[0048] The cobalt-based catalyst prepared in Example 1 and the nickel-based catalyst are loaded into the first reactor and the second reactor respectively, and the pressure of the reactor is adjusted to 0.8MPa, and the temperature of the first reactor is 50° C., and the second reactor The temperature is 140°C, and the volumetric space velocity of benzene is 4h -1 , the molar ratio of hydrogen to benzene is 15, and according to the above conditions, benzene and hydrogen are mixed and passed into gas-phase series double fixed-bed reactors for continuous hydrogenation reaction to obtain cyclohexane.

Embodiment 3

[0050] The cobalt-based catalyst prepared in Example 1 and the nickel-based catalyst are loaded into the first reactor and the second reactor respectively, and the pressure of the regulator reactor is 1MPa, the temperature of the first reactor is 100°C, and the temperature of the second reactor is The temperature is 230°C and the volumetric space velocity of benzene is 1h -1 , the empty molar ratio of hydrogen to benzene is 20, according to the above conditions, benzene and hydrogen are mixed and passed into the gas-phase series double fixed-bed reactors for continuous hydrogenation reaction to obtain cyclohexane.

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Abstract

The invention relates to a method for preparing cyclohexane by hydrogenating benzene. A gas-phase series-connected double-fixed bed reactor is adopted, and the gas-phase series-connected double-fixed bed reactor comprises a first reactor and a second reactor; the first reactor is filled with a load type cobalt-based catalyst; the second reactor is filled with a load type nickel-based catalyst. Compared with the traditional process for preparing the cyclohexane by hydrogenating the benzene, the method disclosed by the invention can effective control the generation of reaction heat and prevent the phenomenon of 'temperature runaway' generated by excessively high reaction speed; in addition, the method disclosed by the invention sufficiently makes up the cost raise brought by increasing a reactor in such a way that double reactors both adopt non-noble metal catalysts and can provide high transformation ratio.

Description

technical field [0001] The invention relates to a method for preparing cyclohexane, more specifically, a method for preparing cyclohexane by hydrogenating 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. At present, more than 90% of cyclohexane in industry is prepared by hydrogenation of benzene, and its production technology is relatively mature. Commonly used catalysts include nickel series, platinum series and palladium series, etc., among which nickel-aluminum system catalysts have better It is widely used in existing industrial installations due to its high activity and relatively low p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C13/18C07C5/10
Inventor 梁中伟鲁树亮黄文氢
Owner CHINA PETROLEUM & CHEM CORP
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