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Method for preparing cyclohexyl bezene through highly-selectively catalytic hydrogenation for biphenyl

A cyclohexylbenzene, high-selectivity technology, applied in chemical instruments and methods, hydrogenation hydrocarbons, physical/chemical process catalysts, etc., can solve the problems of high production cost, difficult to obtain raw materials, unsuitable for industrial production, etc., to achieve The effect of low cost and high selectivity

Inactive Publication Date: 2006-07-12
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The yield obtained by the reaction is generally high, but the raw materials are not easy to obtain or the catalyst prepa

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put 5 grams of biphenyl, 25 milliliters of solvent, 0.5 gram of activated skeleton nickel catalyst in a kettle-type high-pressure reactor with a volume of 50 milliliters, replace the air after airtight, and then charge 20Kgcm -2 Hydrogen, the hydrogen absorption reaction occurs at room temperature, put it into the oil bath and slowly heat up, adjust the hydrogen valve to make the system pressure reach 20Kgcm -2 , after 40 minutes, the reaction was complete. After cooling, samples were taken and analyzed by capillary gas chromatography. The conversion rate was 100%, the yield of hydrogenated products of single benzene ring was 0.2%, and the yield of fully hydrogenated products was 99%.

Embodiment 2

[0020] Put 3.5 grams of biphenyl, 20 milliliters of solvent, 0.5 gram of activated skeleton nickel catalyst in a kettle-type high-pressure reactor with a volume of 50 milliliters, replace the air after airtight, and then charge 10Kgcm -2 Hydrogen, the hydrogen absorption reaction occurs at room temperature, put it in an oil bath and slowly heat up to 100 degrees, adjust the hydrogen valve to make the system pressure reach 10Kgcm -2 , and then hold for 1 hour. After cooling, samples were taken for capillary gas chromatography analysis, the conversion rate was 99.8%, and the yield of the product cyclohexylbenzene was 99.4%.

Embodiment 3

[0022] Put 75 grams of biphenyl, 0.5 liters of solvent, and 25 grams of activated skeleton nickel catalyst in a kettle-type high-pressure reactor with a volume of 1 liter, replace the air after sealing, and then charge 10Kgcm -2 Hydrogen, the hydrogen absorption reaction occurs at room temperature, put it in an oil bath and slowly heat up to 100 degrees, adjust the hydrogen valve to make the system pressure reach 10Kgcm -2 , and then hold for 1 hour. After cooling, samples were taken for capillary gas chromatography analysis, the conversion rate was 99.9%, and the yield of the product cyclohexylbenzene was 99.2%.

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Abstract

The invention relates to a method for using a dipheyl highly selective catalyst hydrogenated to prepare cyclohexyl benzene in the field of holder nickel applied technology. The method can use dipheyl highly selective catalyst hydrogenated to prepare the fine chemical cyclohexyl benzene with high annex value. The once-through return rate can achieve to 90%. The pioneer body of the main crystal is the alloy prepared by high temperature fusion technology; the constitute expression is NiAlM, wherein the quench component M is one or some of Fe, Mn, Mo, Cr. The pioneer body uses NaOH water solution to actively expel Al to form the holder nickel catalyst with high hydrogenated active and high selectivity.

Description

technical field [0001] The invention belongs to the application technical field of catalytic hydrogenation, and relates to a method for preparing cyclohexylbenzene by catalytic hydrogenation of biphenyl with high selectivity. The method can selectively hydrogenate biphenyl under mild conditions to prepare high-purity cyclohexylbenzene. Background technique [0002] Cyclohexylbenzene is an important chemical intermediate. It has special physical and chemical properties due to its high boiling point and condensation point close to room temperature. Cyclohexylbenzene liquid crystal material has the characteristics of extremely high chemical stability, photochemical stability, low viscosity and excellent physical properties, and is one of the ideal materials for displays. Cyclohexylbenzene can also be used as an additive for the electrolyte of lithium secondary batteries, which can improve the cycle performance of lithium ion batteries, has anti-overcharge performance, and can ...

Claims

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Application Information

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IPC IPC(8): C07C5/11C07C13/19B01J23/755
CPCY02P20/52Y02P20/582
Inventor 吕连海荣泽明胡爽辛俊娜袁忠义杜文强李文双由继业
Owner DALIAN UNIV OF TECH
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