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Method for separating cyclohexanone oxime, cyclohexanone and toluene from ammoximation reaction product

An ammoximation reaction and cyclohexanone oxime technology is applied in the field of cyclohexanone and toluene to separate cyclohexanone oxime, so as to achieve the effects of reducing the amount of toluene, reducing the difficulty of recovery and reducing the probability of decomposition

Active Publication Date: 2022-07-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for separating cyclohexanone oxime, cyclohexanone and toluene from ammoximation reaction product
  • Method for separating cyclohexanone oxime, cyclohexanone and toluene from ammoximation reaction product
  • Method for separating cyclohexanone oxime, cyclohexanone and toluene from ammoximation reaction product

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Embodiment 1

[0023] A method for separating cyclohexanone oxime, cyclohexanone and toluene from an ammoximation reaction product. Taking a 100,000-ton / year device as an example, the cyclohexanone oxime content is 24.7%, the toluene content is 73.1%, and the cyclohexanone oxime content is 73.1%. The mixture with hexanone content of 0.2% and water content of 2% is added to the pressurized toluene tower T1, the operating pressure of the pressurized toluene tower T1 is 150kpa, the top temperature is 118°C, and 20-30% of toluene and toluene are distilled from the top of the tower. All the moisture in the material, the top steam of the tower enters the intermediate reboiler E3, and after condensing to a temperature 15°C higher than the reboiler feed temperature of E3, it enters the second condenser and is further condensed to 45°C and enters the reflux tank for phase separation, and the water phase is collected. out, part of the toluene liquid is refluxed into the tower, part of it is extracted, ...

Embodiment 2

[0027] A method for separating cyclohexanone oxime, cyclohexanone and toluene from an ammoximation reaction product. Taking a 100,000-ton / year device as an example, the cyclohexanone oxime content is 24.7%, the toluene content is 73.1%, and the cyclohexanone oxime content is 73.1%. A mixture with a hexanone content of 0.2% and a water content of 2% is added to the pressurized toluene tower T1, the operating pressure of the pressurized toluene tower T1 is 190kpa, the top temperature is 127°C, and 20-30% of toluene and toluene are distilled from the top of the tower. All the moisture in the material, the overhead steam enters the intermediate reboiler E3, and after condensing to a temperature 20°C higher than the reboiler feed temperature of E3, it enters the second condenser and further condenses to 45°C and enters the reflux tank for phase separation, and the water phase is collected. out, part of the toluene liquid is refluxed into the tower, part of it is extracted, and the m...

Embodiment 3

[0034] A method for separating cyclohexanone oxime, cyclohexanone and toluene from an ammoximation reaction product. Taking a 100,000-ton / year device as an example, the cyclohexanone oxime content is 24.7%, the toluene content is 73.1%, and the cyclohexanone oxime content is 73.1%. A mixture with a hexanone content of 0.2% and a water content of 2% is added to the pressurized toluene tower T1, the operating pressure of the pressurized toluene tower T1 is 190kpa, the top temperature is 127°C, and 20-30% of toluene and toluene are distilled from the top of the tower. All the moisture in the material, the overhead steam enters the intermediate reboiler E4, and after condensing to a temperature 20°C higher than the reboiler feed temperature of E3, it enters the second condenser and further condenses to 45°C and enters the reflux tank for phase separation, and the water phase is collected. out, part of the toluene liquid is refluxed into the tower, part of it is extracted, and the m...

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Abstract

The invention discloses a method for separating cyclohexanone oxime, cyclohexanone and toluene from an ammoximation reaction product. The method comprises the steps of: adding a mixture of cyclohexanone oxime, toluene and cyclohexanone into a pressurized toluene tower; 20-30% of toluene and all the moisture in the material are evaporated from the top of the toluene pressure tower, and the discharge from the tower still enters the clapboard rectification column. The clapboard rectification column is operated under reduced pressure. All the toluene and cyclohexanone are steamed out from the top, and the material of the tower bottom is cyclohexanone oxime product, wherein, the partition rectification tower is heated by the intermediate reboiler and the tower bottom reboiler, and the heat source of the tower bottom reboiler is provided by the external The public heat source is provided, and the intermediate reboiler heat source is provided by the overhead steam of the pressurized toluene column. The process reduces energy consumption by about 35-40% compared with the traditional process, and reduces the amount of toluene in the exhaust gas.

Description

technical field [0001] The invention relates to a method for separating cyclohexanone oxime, cyclohexanone and toluene from cyclohexanone ammoximation reaction products. Background technique [0002] The reaction product of cyclohexanone ammoximation is extracted with toluene to form a mixture of cyclohexanone oxime, toluene and cyclohexanone, which needs to be separated to obtain cyclohexanone oxime, toluene and cyclohexanone. Among them, cyclohexanone oxime is used as the raw material of caprolactam, toluene is returned to the extraction system, and impurities such as cyclohexanone are discharged from the system. The composition of the raw material is toluene (about 70-75%), cyclohexanone oxime (about 23-25%) and cyclohexanone (≤1%). The traditional process is: the mixture first enters the toluene decompression tower A, in which 85-90% of the total toluene and the azeotrope of toluene and water are distilled out, and the top components of the tower are first condensed by ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C251/44C07C249/14C07C49/403C07C45/82C07C15/06C07C7/04
CPCC07C249/14C07C45/82C07C7/04C07C251/44C07C49/403C07C15/06Y02P20/10
Inventor 许春建何永超李玲李伟松张稼骏郑凯天
Owner TIANJIN UNIV
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