Method for preparing gamma-butyrolactone and cyclohexanone by couple process

A technology for cyclohexanone and butyrolactone, which is applied in the field of preparing γ-butyrolactone and cyclohexanone, can solve the problems of waste, high liquid air cannot be fully exerted, low conversion rate of cyclohexanone, etc., and achieves less energy. , The effect of saving hydrogen production equipment

Inactive Publication Date: 2006-06-21
SYNEFUELS CHINA
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Problems solved by technology

[0018] Influenced by heat transfer in the actual production process, its high liquid space cannot be fully utilized. At the same time, it is limited by the characteristics of thermodynamic equilibrium, so that the conversion rate of cyclohexanol dehydrogenation to cyclohexanone is not high. In addition, the hydrogen generated by the reaction is vented. Causes waste and increases production costs if recycled through a series of unit operations

Method used

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  • Method for preparing gamma-butyrolactone and cyclohexanone by couple process
  • Method for preparing gamma-butyrolactone and cyclohexanone by couple process
  • Method for preparing gamma-butyrolactone and cyclohexanone by couple process

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Embodiment 1

[0051] 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 maleic anhydride enter the reactor after mixing with circulating hydrogen in a molar ratio of 6.3:1. At normal pressure, the total space velocity of liquid is 0.4hr -1 , Under the condition that the molar ratio of circulating hydrogen and mixed raw materials is 7:1, when the temperature is 260°C, the conversion rate of cyclohexanol is 53.3%, the conversion rate of maleic anhydride is 99.0%, the selectivity of cyclohexanone is 92.6%, and the γ - Butyrolactone selectivity 89.5%; when the reaction temperature is 280°C, the conversion rate of cyclohexanol is 66.1%, the conversion rate of maleic anhydride is 99.5%, the selectivity of cyclohexanone is 91.3%, and the selectivity of γ-butyrolactone is 87.8% ; After normal operation and reaction, there is no need for external hydrogen...

Embodiment 2

[0053] In a gas-phase fixed-bed reactor (the catalyst composition, activation reduction and reactor structure are the same as in Comparative Example 1), the reaction pressure is normal pressure, and the reaction temperature is 270°C. , the molar ratio of circulating hydrogen to mixed feedstock is 15:1, and the total liquid space velocity is about 0.4hr -1 Conditions, the conversion rate of cyclohexanol is 58.1%, the conversion rate of maleic anhydride is 99.3%, the selectivity of cyclohexanone is 92.0%, and the selectivity of γ-butyrolactone is 88.2%.

Embodiment 3

[0055] 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, 290 ℃ of reaction temperature, respectively vaporized cyclohexanol, maleic anhydride by 4.5: 1 molar ratio, The molar ratio of circulating hydrogen to mixed raw materials is 10:1, and the total liquid space velocity is about 0.5hr -1 Conditions, the conversion rate of cyclohexanol is 75.8%, the conversion rate of maleic anhydride is 98.8%, the selectivity of cyclohexanone is 89.0%, and the selectivity of γ-butyrolactone is 86.8%.

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Abstract

A coupling method for preparing ª†-butyrolactone and cyclohexanone, carrying out integral reaction with the mixture of cyclohexanol 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 compared with current technology by the integral reaction of hydrogenation and dehydrogenation, low energy consumption, no need for hydrogenation or hydrogen recovery, low producing cost, high selectivity and recovery rate, simple preparing process and easy-to-operate.

Description

[0001] Field [0002] The invention belongs to a method for preparing gamma-butyrolactone and cyclohexanone, in particular to a method for preparing gamma-butyrolactone and cyclohexanone by using maleic anhydride and cyclohexanol as raw materials. Background technique [0003] γ-butyrolactone is an important organic chemical product, widely used in petrochemical, pharmaceutical, dyestuff, pesticide and fine chemical industry, especially in the synthesis of pyrrolidone, N-methylpyrrolidone, vinylpyrrolidone, α-acetyl It is widely used in important products such as butyrolactone. In addition, γ-butyrolactone is also a high-boiling solvent with strong solvency, good conductivity and stability, and is safe and convenient to use and manage. [0004] At present, there are two main raw material routes to produce γ-butyrolactone in the world, namely 1,4-butanediol dehydrogenation method and maleic anhydride hydrogenation method. Among them, the maleic anhydride hydrogenation method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/33C07C45/29C07C49/303
CPCY02P20/129
Inventor 朱玉雷李永旺郑洪岩黄龙王珏相宏伟
Owner SYNEFUELS CHINA
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