Preparation method of ortho-methyl cyclohexyl alcohol

A technology of o-methylcyclohexyl alcohol and o-cresol, which is applied in the field of catalysts, can solve the problems of low selectivity, difficult separation of products, and low catalytic activity, and achieve high activity, improved hydrogenation efficiency, and long catalyst life. Effect

Inactive Publication Date: 2004-10-13
YICHANG SUPENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Instead of using Ni / SiO 2 The catalyst needs to add solvent (suspended bed), the catalytic activity is not high, the hydrogenation conversion rate is only 80-85%, and the selectivity is not high, and the intermediate product o-methylcyclohexanone is generated, and the product is difficult to separate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Ni / δ-Al 2 o 3 It is a catalyst, wherein the content of Ni is 32wt%, the hydrogenation reaction of o-cresol is carried out to generate o-methylcyclohexyl alcohol, the reaction pressure is 0.2MP, the reaction temperature is 195°C, and the reaction yield can reach 90%.

Embodiment 2

[0019] Ni / γ-Al 2 o 3 It is a catalyst, wherein, the Ni content is 5wt%, and the Mo content is 0.25wt%. The hydrogenation reaction of o-cresol generates o-methylcyclohexyl alcohol, the reaction pressure is 0.1MP, and the reaction temperature is 175°C. The reaction yield can be up to 70%.

Embodiment 3

[0021] Ni / γ-Al 2 o 3 It is a catalyst, wherein, the Ni content is 48wt%, the Cr content is 0.48wt%, and the Cs content is 2.4% to carry out the hydrogenation reaction of o-cresol to generate o-methylcyclohexyl alcohol, the reaction pressure is 0.1MP, and the reaction temperature is 175°C , The reaction yield can reach 80%.

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PUM

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Abstract

The present invention discloses a preparation method of ortho-methylcyclohexyl alcohol. The method includes the following steps: in the presence of catalyst the hydrogenation reaction of ortho-cresol can be used for producing ortho-methylcyclohexyl alcohol, and it is characterized by that the described catalyst uses gamma-delta Al2O3 as carrier and includes active component Ni with catalytic effective amount, the catalyst Ni content is 0.5-50 wt%. Its reaction pressure is 0.1-0.5 MP, reaction temp. is 150-250 deg.C. The activity of the described catalyst is high, can be up to 95%, under the condition of 0.2 MP and 190-200 deg.C, if the pressure is 0.2-1 MP, its conversion rate can be further raised, and the life of said catalyst can be prolonged.

Description

technical field [0001] The invention relates to a preparation method of o-methylcyclohexyl alcohol, in particular to a catalyst used in the reaction process. Background technique [0002] O-methylcyclohexyl alcohol is an important chemical raw material, such as can be used to prepare o-methylcyclohexyl acetate. At present, traditional preparation methods include the following: [0003] In Ni / SiO 2 Under catalysis, use isopropanol as solvent to carry out hydrogenation reaction; [0004] Use Pd / C as catalyst, under certain pressure, react at 100-150℃; [0005] Catalyzed by Raney nickel or chromium-promoted nickel; [0006] Ni / SiO 2 The catalyst reacts at a hydrogen pressure of 0.36-1.08bar, a pressure of 0.006-0.06bar, and a temperature of 150-240°C. [0007] There are obvious defects in the above methods, wherein Pd / C is a noble metal catalyst, the selectivity is not high, the price is expensive, and the intermediate product o-methylcyclohexanone is generated, and the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/14C07C35/08
Inventor 刘纯山傅骐赫龙
Owner YICHANG SUPENG TECH CO LTD
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