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Technological method for producing cyclohexanone through dehydrogenation of cyclohexanol

A technology of cyclohexanone and cyclohexanol, which is applied in the direction of dehydrogenation preparation, separation/purification of carbonyl compounds, oxidation preparation of carbonyl compounds, etc., can solve the problems of high production cost and high energy consumption, and achieve reduction of energy consumption and cost, Energy-saving and consumption-saving effects

Active Publication Date: 2016-01-06
李国涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Solve the problems of high energy consumption and high production cost in the existing technology

Method used

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  • Technological method for producing cyclohexanone through dehydrogenation of cyclohexanol
  • Technological method for producing cyclohexanone through dehydrogenation of cyclohexanol
  • Technological method for producing cyclohexanone through dehydrogenation of cyclohexanol

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Embodiment 1

[0047] Take pure cyclohexanol as fresh raw material, according to the present invention figure 1 The flow process shown adopts the dehydrogenation product composition data (conversion rate 63.9%, selectivity 99.4%) given in Example 6 disclosed by patent WO98 / 10864, ​​and the drying tower uses cyclohexene as the light key component; cyclohexanone The distillation column uses cyclohexanol as the key component, and its content is controlled to be less than 10ppm; the reaction gas deheavy separation tower uses phenol as the key component and its content is controlled to be less than 1ppm; the processing capacity is 12.8 tons of fresh cyclohexanol raw materials per hour After calculation, the operating conditions and energy consumption of each process are summarized in Table 1.

Embodiment 2

[0049] With the cyclohexanol that contains 500ppm methyl cyclopentanol as raw material, according to the present invention figure 2 As shown in the flow process, the dehydrogenation product composition data (conversion rate 63.9%, selectivity 99.4%) given in Example 6 disclosed by the patent WO98 / 10864 is adopted, and the cyclohexanol lightening tower uses methylcyclopentanol as the light key Components, control the content of methylcyclopentanol in the cyclohexanol raw material after distillation to be less than 50ppm; the reaction gas deheavy separation tower uses phenol as the key component and controls its content to be less than 1ppm; the drying tower uses cyclohexene as the light key Components: The cyclohexanone distillation tower uses cyclohexanol as the key component, and its content is controlled to be less than 10ppm. The processing capacity is calculated based on 12.8 tons of fresh cyclohexanol raw material per hour, and the operating conditions and energy consump...

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Abstract

A technological method for producing cyclohexanone through dehydrogenation of cyclohexanol comprises procedures including gasification of a raw material, dehydrogenation reaction, gas-liquid separation, cyclohexanone evaporation and the like; the method is characterized in that a gasified and heated cyclohexanol material is contacted with a dehydrogenation catalyst, reaction effluent containing components including hydrogen, cyclohexanone, cyclohexanol, heavy impurities and the like is obtained, and before the hydrogen is separated out, the heavy impurities in the reaction effluent are separated out firstly. According to the method, repeated distillation of the cyclohexanol is reduced, heat contained in a gas-phase reaction product is fully utilized, energy consumption and the cost of production of the cyclohexanone are substantially reduced, and the technique economics of the technology for preparing the cyclohexanone through dehydrogenation of the cyclohexanol is improved.

Description

technical field [0001] The invention relates to a production method of cyclohexanone, in particular to a process for producing cyclohexanone by catalytic dehydrogenation of cyclohexanol. Background technique [0002] Cyclohexanone is an intermediate for the preparation of caprolactam, which is mainly prepared by catalytic dehydrogenation of cyclohexanol. At present, the low-temperature catalytic dehydrogenation process is commonly used in the industry, mainly based on the fact that the low-temperature catalyst has higher cyclohexanone selectivity and lower impurity generation, such as the catalysts disclosed in patents ZL97196061, WO98 / 10864 and ZL02807661 In terms of performance, under the condition of reaction temperature of 220-260°C, the selectivity of cyclohexanone is as high as over 99%, and only a small amount of by-products are formed. [0003] The by-products in the dehydrogenation process of cyclohexanol are divided into light impurities and heavy impurities. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/403C07C45/29C07C45/82
CPCC07C45/002C07C45/82C07C49/403
Inventor 李国涛
Owner 李国涛
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