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Preparation method of cyclohexylbenzene

A technology of cyclohexylbenzene and biphenyl, which is applied in the field of preparation of cyclohexylbenzene, can solve the problems of expensive industrial operation of catalysts, long reaction time, and poor selectivity, and achieve the effects of low cost, simple operation, and easy separation

Inactive Publication Date: 2015-03-25
常熟市尚登新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the reaction time is long and the yield is low
[0004] The selective hydrogenation of biphenyl still faces the disadvantages of low yield, poor selectivity, expensive catalyst and cumbersome industrial operation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 10Kg iron phthalocyanine, 8Kg nickel oxide and 6Kg aluminum phosphate are loaded into the fixed bed reactor, and the top and bottom of the reactor are respectively filled with ceramic balls. First pass nitrogen to the reactor to 1MPa for replacement 3 times, then raise the temperature to 180°C, enter the biphenyl solution at the top inlet at 3 tons / hour, and enter the hydrogen gas at the bottom inlet at 10 kg / hour. The pressure in the reactor is maintained at 2.5MPa. Continuously enter the reactor to participate in the reaction; the outlet of the reactor is connected with the inlet of the packed tower, and the reaction product passes through the packed tower to obtain cyclohexylbenzene. The product of the reaction process undergoes a packing tower separation process to obtain at least solvent and cyclohexylbenzene, wherein the solvent obtained in the separation process is recycled back to the reactor to participate in the reaction process to achieve recycling.

[0021] ...

Embodiment 2

[0023] 15Kg iron phthalocyanine, 12Kg nickel oxide and 9Kg aluminum phosphate are loaded into the fixed bed reactor, and the top and bottom of the reactor are respectively filled with ceramic balls. First pass nitrogen into the reactor to 1.3MPa for replacement 3 times, then raise the temperature to 180°C, enter the biphenyl solution at the top inlet at 3 tons / hour, and enter the hydrogen gas at the bottom inlet at 10 kg / hour, and keep the pressure in the reactor at 2.5MPa. The raw materials enter the reactor continuously to participate in the reaction; the outlet of the reactor is connected with the inlet of the packed tower, and the reaction product passes through the packed tower to obtain cyclohexylbenzene. The product of the reaction process undergoes a packing tower separation process to obtain at least solvent and cyclohexylbenzene, wherein the solvent obtained in the separation process is recycled back to the reactor to participate in the reaction process to achieve rec...

Embodiment 3

[0026] 5Kg iron phthalocyanine, 4Kg nickel oxide and 3Kg aluminum phosphate are loaded into the fixed bed reactor, and the top and bottom of the reactor are respectively filled with ceramic balls. First pass nitrogen to the reactor to 1.9MPa for replacement 3 times, then raise the temperature to 180°C, enter the biphenyl solution at the top inlet at 3 tons / hour, and enter the hydrogen gas at the bottom inlet at 10 kg / hour, and keep the pressure in the reactor at 2.5MPa. The raw materials enter the reactor continuously to participate in the reaction; the outlet of the reactor is connected with the inlet of the packed tower, and the reaction product passes through the packed tower to obtain cyclohexylbenzene. The product of the reaction process undergoes a packing tower separation process to obtain at least solvent and cyclohexylbenzene, wherein the solvent obtained in the separation process is recycled back to the reactor to participate in the reaction process to achieve recycli...

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PUM

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Abstract

The invention relates to a method for preparing cyclohexylbenzene by virtue of biphenyl catalytic hydrogenation. The method comprises the following steps: adding a biphenyl solution into a reactor containing a catalyst at 180 DEG C, and then introducing hydrogen to react with biphenyl; and separating a reaction product by a packed tower to obtain cyclohexylbenzene, wherein the catalyst is a mixture of iron phthalocyanine, nickel oxide and aluminum phosphate. A solvent, cyclohexylbenzene and bicyclohexane can be obtained by separating the product of the reaction process, wherein the solvent obtained in the separation process is circulated back to reaction. The yield of cyclohexylbenzene prepared by the method provided by the invention reaches 96%; and the preparation method has outstanding advantages of low cost, high yield and good selectivity, and is very suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of cyclohexylbenzene, which belongs to the field of organic synthesis. Background technique [0002] Cyclohexylbenzene is an important chemical intermediate, it can produce phenol and cyclohexanone through oxidation reaction, phenol is an important chemical raw material, cyclohexanone is an intermediate for the production of caprolactam and nylon; cyclohexylbenzene can be synthesized Liquid crystal material; cyclohexylbenzene can also be used as an additive for lithium ion secondary battery electrolyte, which can improve the cycle performance of lithium ions, have anti-overcharge performance and improve the safety performance of the battery. [0003] The existing three synthesis routes of cyclohexylbenzene are: benzene hydroalkylation method; benzene and alkylating reagent reaction preparation; biphenyl selective hydrogenation method. The yield of biphenyl selective hydrogenation method is higher than that...

Claims

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Application Information

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IPC IPC(8): C07C13/28C07C5/10
Inventor 吴国民
Owner 常熟市尚登新材料有限公司
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