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Preparation method of o-methylcyclohexanol

A technology of o-methylcyclohexanol and o-cresol, which is applied in the field of o-methylcyclohexanol by catalytic hydrogenation of o-cresol, can solve the problem of low raw material conversion rate and product yield, unfavorable continuous and large-scale production , low yield of o-methylcyclohexanol, etc., to achieve high yield, low production cost and energy consumption, and facilitate smooth operation

Inactive Publication Date: 2015-05-20
HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the Ni / Al 2 o 3 The catalyst activity is not enough, the yield of o-methylcyclohexanol is low, and the catalyst life is short
[0005] In short, the current process for preparing o-methylcyclohexanol by hydrogenation of o-cresol still has disadvantages such as low conversion rate of raw materials and low product yield, insufficient catalyst activity and easy deactivation, which is not conducive to continuous and large-scale production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Using Ru / ZrO with 1.0w%Ru 2 Catalytic hydrogenation in a fixed-bed reactor to prepare o-methylcyclohexanol. The raw material for hydrogenation is a methylcyclohexane solution containing 50w% o-cresol. The reaction conditions are: reaction temperature 100°C, reaction pressure 5.0 MPa, the space velocity of o-cresol is 1.0h -1 , The molar ratio of hydrophenol is 10:1. The conversion rate of o-cresol and the selectivity of o-methylcyclohexanol were 99.8% and 99.1% respectively, and the yield of o-methylcyclohexanol was 98.9%.

Embodiment 2

[0018] Using Pd / Al with 2.0w%Pd 2 o 3 Catalyst was used in a fixed bed reactor to prepare o-methylcyclohexanol by catalytic hydrogenation. The raw material for hydrogenation was a butanol solution containing 20w% o-cresol. The reaction conditions were: reaction temperature 60°C, reaction pressure 7.0MPa, o Cresol space velocity is 2.0h -1 , The molar ratio of hydrophenol is 30:1. The conversion rate of o-cresol and the selectivity of o-methylcyclohexanol were 96.5% and 99.7% respectively, and the yield of o-methylcyclohexanol was 96.2%.

Embodiment 3

[0020] Using Ir / TiO with 10.0w%Ir 2 Catalysts were used in a fixed-bed reactor for catalytic hydrogenation to prepare o-methylcyclohexanol. The raw material for hydrogenation was a butyl acetate solution containing 70w% o-cresol. The reaction conditions were: reaction temperature 180°C, reaction pressure 10.0MPa, The space velocity of o-cresol is 0.25h -1 , The molar ratio of hydrophenol is 4:1. The conversion rate of o-cresol and the selectivity of o-methylcyclohexanol were 100% and 98.2% respectively, and the yield of o-methylcyclohexanol reached 98.2%.

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PUM

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Abstract

The invention discloses a preparation method of o-methylcyclohexanol. A hydrogenation raw material contacts with hydrogen in a hydrogenation reactor under the action of a catalyst and reaction, so as to obtain an o-methylcyclohexanol product. The method has the advantages of simple technological process, high catalyst activity, and high in o-cresol conversion rate and o-methylcyclohexanol yield; the activity selectivity after the catalyst continuously runs for 2500 hours is not obviously reduced; and the method is suitable for continuous and large-scale production of o-methylcyclohexanol.

Description

technical field [0001] The invention relates to a method for preparing o-methylcyclohexanol, in particular to a method for preparing o-methylcyclohexanol by catalytic hydrogenation of o-cresol. Background technique [0002] O-methylcyclohexanol is an important chemical raw material, and its main use is to synthesize o-methylcyclohexyl acetate. O-methylcyclohexyl acetate is an excellent working solvent for hydrogen peroxide synthesis, and it is expected to replace trioctyl phosphate, which is commonly used in the industrial production of hydrogen peroxide, which is conducive to improving the production capacity of hydrogen peroxide devices and reducing operating costs. With the popularization and application of o-methylcyclohexyl acetate in the hydrogen peroxide synthesis process, the demand for o-methylcyclohexyl acetate is also increasing, and the demand for o-methylcyclohexanol as its synthetic raw material is also rapidly Increase. [0003] Tianjin University (Master's ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C35/08C07C29/20
CPCC07C29/20C07C2601/14C07C35/08
Inventor 佘喜春向明林易娇敖博汪永军李庆华
Owner HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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