Method and system for refining cyclohexanone and recycling cyclohexanol

A technology of cyclohexanol and cyclohexanone, which is applied in the field of cyclohexanone refining and cyclohexanol recycling, can solve the problem of high reaction activity, achieve the effects of high product purity, reduce material consumption and improve yield

Active Publication Date: 2016-11-09
SEDIN NINGBO ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the crude product of cyclohexanone produced by hydrogenation of phenol contains cyclohexanone, cyclohexanol, unreacted phenol and a small amount of light and heavy impurities, a

Method used

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  • Method and system for refining cyclohexanone and recycling cyclohexanol
  • Method and system for refining cyclohexanone and recycling cyclohexanol
  • Method and system for refining cyclohexanone and recycling cyclohexanol

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Example Embodiment

Specific embodiment one

[0031] A method for refining cyclohexanone and recycling cyclohexanol, such as figure 1 As shown, it specifically includes the following steps:

[0032] (1) The alcohol and ketone mixture (crude phenol hydrogenation product) containing cyclohexanone, cyclohexanol, light components and heavy components is sent to light removal tower 1, and the number of theoretical plates in light removal tower 1 is controlled to 30 -70 blocks, the pressure at the top of the tower is controlled at 40-65kpa, the reflux ratio is controlled at 100-1000, the light impurity components with cyclohexanone content less than 20wt% are extracted from the top of the light-removing tower 1, and the light component is extracted from the bottom of the tower Materials with sub-content less than 50ppm;

[0033] (2) Send the material with light component content lower than 50ppm obtained in step (1) to cyclohexanone product tower 2, control the theoretical plate number of cyclohexanone prod...

Example Embodiment

Specific embodiment two

[0040] The system used in the cyclohexanone refining and cyclohexanol recycling method in the above specific embodiment 1, such as figure 1 As shown, it includes light removal tower 1, cyclohexanone product tower 2, cyclohexanol recovery tower 3, cyclohexanol dehydrogenation reactor 4, gas-liquid separation tank 5, dehydration tower 6, oil-water separator 7, waste water collection tank 8. Cyclohexane extraction tower 9, alcohol and ketone recovery tower 10, the upper end of the light removal tower 1 is provided with an alcohol and ketone mixture material (crude phenol hydrogenation product) inlet 11, and the bottom material outlet of the light removal tower 1 and cyclohexanone product The middle material inlet of tower 2 is connected, the bottom material outlet of cyclohexanone product tower 2 is connected to the middle material inlet of cyclohexanol recovery tower 3, the bottom of cyclohexanol recovery tower 3 is provided with a heavy component outlet 1...

Example Embodiment

Specific embodiment three

[0042] The process method is the same as the first embodiment above, and the system equipment is the same as the second embodiment above. The differences are:

[0043] The number of theoretical plates in the light-removing tower 1 is 55, the top pressure is 55kpa, and the mass reflux ratio is 400;

[0044] The number of theoretical plates of the cyclohexanone product tower 2 is 55, the pressure at the top of the tower is 15 kpa, and the mass reflux ratio is 3;

[0045] The number of theoretical plates in the cyclohexanol recovery tower 3 is 45, the top pressure is 20 kpa, and the reflux ratio is 1.5;

[0046] The number of theoretical plates in the cyclohexane extraction tower 9 is 8, and the tower top pressure is 130 kpa;

[0047] The number of theoretical plates of the alcohol and ketone recovery tower 10 is 40, the pressure at the top of the tower is 105 kpa, and the mass reflux ratio is 0.8;

[0048] The dehydration tower 6 is a rectification tower, the num...

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Abstract

The invention discloses a method and a system for refining cyclohexanone and recycling cyclohexanol. The method is characterized by comprising the following steps: sending an alcohol ketone mixture into a light-component removal tower for removing light components, sending the material discharged from the tower bottom into a cyclohexanone product tower, acquiring a high-purity cyclohexanone product from the tower top and a crude product mainly comprising cyclohexanol from the tower bottom, then sending the crude product into a cyclohexanol recovery tower, and acquiring cyclohexanol from the tower top; mixing the acquired cyclohexanol with proper amount of water, heating and sending into a cyclohexanol dehydrogenation reactor for dehydrogenation, so as to obtain a mixed product containing cyclohexanol, cyclohexanone and water, performing two-stage cooling on the dehydrogenated product, then performing gas-liquid separation, sending the gas phase and the liquid phase into a dewatering tower for dewatering processing, sending oil-containing wastewater removed at the tower top to a cyclohexane extraction tower, sending an obtained upper-layer oil phase to an alcohol-ketone recovery tower, and sending an oil phase containing cyclohexanone and cyclohexanol and obtained at the bottom of alcohol-ketone recovery tower to a dewatering tower for cycling. The invention comprises the advantages that the product cyclohexanone is high in purity, cyclohexnoal is efficiently converted into cyclohexanone at a high yield, and the system is high in energy integration degree and low in energy consumption.

Description

technical field [0001] The present invention relates to a method and system for refining cyclohexanone and recycling cyclohexanol, in particular to a method and system for refining cyclohexanone and recycling cyclohexanol by treating the hydrogenation reaction product of cyclohexanone produced by hydrogenation of phenol. It can be used in the purification of cyclohexanone by dehydrogenation of cyclohexanol as raw material and the recycling process of cyclohexanol. Background technique [0002] Cyclohexanone is an important fine chemical mainly used in the production of caprolactam and adipic acid, which are the precursors of nylon-6 and nylon-66, respectively. In addition to being used in the preparation of amide products, cyclohexanone is also used as an organic solvent and in the preparation of fine chemicals. There are generally three industrial preparation methods of cyclohexanone: cyclohexane oxidation method, cyclohexene hydration method and phenol hydrogenation metho...

Claims

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Application Information

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IPC IPC(8): C07C45/51C07C45/82C07C45/78C07C45/80C07C49/403C07C29/74C07C29/80C07C29/86C07C35/08
CPCC07C29/74C07C29/80C07C29/86C07C35/08C07C45/512C07C45/78C07C45/80C07C45/82C07C49/403
Inventor 梅鑫谷新春孟启贵沈铁孟陈发挥余爱平刘新安王宇光王爱芳苗延军赵风轩
Owner SEDIN NINGBO ENG
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