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Preparation of 2-methylfuran and cyclohexanone by couple method

A technology of methyl furan and cyclohexanone, which is applied in the field of preparation of 2-methylfuran and cyclohexanone, can solve the problems of waste, high liquid air cannot be fully utilized, and the conversion rate of cyclohexanone is not high, so as to achieve less energy , The effect of saving hydrogen production equipment

Inactive Publication Date: 2006-06-21
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0029] The dehydrogenation of cyclohexanol to cyclohexanone is a reversible endothermic reaction in thermodynamics. Due to the endothermic reaction, the actual production process is affected by heat transfer, and its high liquid space cannot be fully utilized. At the same time, it is limited by thermodynamic equilibrium. , so that the conversion rate of cyclohexanol dehydrogenation to cyclohexanone is not high, and the hydrogen generated by the reaction is vented to cause waste. If it is recovered through a series of unit operations, the production cost will be increased.

Method used

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  • Preparation of 2-methylfuran and cyclohexanone by couple method
  • Preparation of 2-methylfuran and cyclohexanone by couple method
  • Preparation of 2-methylfuran and cyclohexanone by couple method

Examples

Experimental program
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Effect test

Embodiment 1

[0061] In the gas-phase fixed-bed reactor (the installed catalyst composition and activation reduction and reactor structure are the same as Comparative Example 1), respectively vaporized cyclohexanol and furfural enter the reactor after mixing with circulating hydrogen in a 4.3:1 molar ratio. At normal pressure, the total space velocity of liquid is 1.0hr -1 1. Under the condition that the molar ratio of circulating hydrogen to the mixture is 5:1, when the temperature is 250°C, the conversion rate of cyclohexanol is 48.6%, the conversion rate of furfural is 99.7%, the selectivity of cyclohexanone is 95.8%, and the 2-methyl The selectivity of methyl furan is 90.7%; when the reaction temperature is 270°C, the conversion rate of cyclohexanol is 62.1%, the conversion rate of furfural is 99.9%, the selectivity of cyclohexanone is 93.4%, and the selectivity of 2-methylfuran is 86.4%; normal operation After the reaction, no external supply of hydrogen is required.

Embodiment 2

[0063] In the gas-phase fixed-bed reactor (the installed catalyst composition and activation reduction and reactor structure are the same as comparative example 1), under normal pressure, 260 ℃ of reaction temperature, respectively vaporized cyclohexanol, furfural are by 4: 1 molar ratio, circulate The molar ratio of hydrogen to mixed raw materials is 10:1, and the total liquid space velocity is about 0.7hr -1 Conditions, the conversion rate of cyclohexanol is 53.6%, the conversion rate of furfural is 99.9%, the selectivity of cyclohexanone is 94.5%, and the selectivity of 2-methylfuran is 88.6%.

Embodiment 3

[0065] In the gas-phase fixed-bed reactor (the installed catalyst composition and activation reduction and reactor structure are the same as comparative example 1), reaction pressure normal pressure, reaction temperature 270 ℃, respectively vaporized cyclohexanol, furfural by 3.6: 1 molar ratio, The molar ratio of circulating hydrogen to mixed raw materials is 25:1, and the total liquid space velocity is about 0.6hr -1 Conditions, the conversion rate of cyclohexanol is 59.0%, the conversion rate of furfural is 99.6%, the selectivity of cyclohexanone is 94.8%, and the selectivity of 2-methylfuran is 87.8%.

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Abstract

A coupling method for preparing 2-methylfuran and cyclohexanone, carrying out integral reaction with the mixture of furfuraldehyde and anhydride under the condition of gas phase, existence of additional hydrogen or no additional hydrogen, proper temperature and hydrogen catalyst. The invention is characterized by the low energy consumption, no need for hydrogenation or hydrogen recovery, low producing cost, high selectivity and productivity, simple preparing process and easy-to-operate.

Description

[0001] Field [0002] The invention belongs to a method for preparing 2-methylfuran and cyclohexanone, and specifically relates to a method for preparing 2-methylfuran and cyclohexanone using furfural and cyclohexanol as raw materials. Background technique [0003] 2-Methylfuran is mainly used in medicine, pesticides and fine chemicals; especially in the pharmaceutical industry, 2-methylfuran is used as a pharmaceutical intermediate for the preparation of vitamin B 1 , drugs such as chloroquine phosphate and becaminoquine phosphate. [0004] At present, 2-methylfuran is produced industrially by gas-phase catalytic hydrogenation of furfural. my country is a major furfural producer. Among furfural deep-processed products, 2-methylfuran is a product with high added value. [0005] Soviet patent SU941366 and Chinese patent CN1145274A both report the technical route of using furfural gas phase hydrogenation to produce 2-methylfuran. [0006] The gas-phase hydrogenation of furfur...

Claims

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Application Information

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IPC IPC(8): C07D307/36C07C45/29C07C49/303
CPCY02P20/129
Inventor 朱玉雷郑洪岩李永旺黄龙龚亮相宏伟
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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