Method and system for producing cyclohexanone from phenol

A technology for cyclohexanone and phenol, applied in the field of phenol production of cyclohexanone, can solve the problems of generating cyclohexanol by-products and the like, and achieve the effects of high conversion rate and yield, reducing side reactions and reducing energy consumption

Active Publication Date: 2018-04-17
SEDIN NINGBO ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, during the preparation of cyclohexanone from phenol, cyclohexanol is often produced as a by-product

Method used

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  • Method and system for producing cyclohexanone from phenol
  • Method and system for producing cyclohexanone from phenol
  • Method and system for producing cyclohexanone from phenol

Examples

Experimental program
Comparison scheme
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specific Embodiment 1

[0038] A method for producing pimelinketone from phenol, such as figure 1 shown, including the following steps:

[0039] (1) The raw material phenol is heated to 130°C by the phenol preheater 1 and sent to the phenol vaporizer 2. In the phenol vaporizer 2, the top pressure of the phenol vaporizer 2 is controlled to 0.22MPaG, and the phenol is double-heated by decarbonized hydrogen partial pressure and steam. Function, phenol is vaporized into gas and mixed with decarburized hydrogen and sent to the raw material superheater 3. In the raw material superheater 3, the gas mixture composed of phenol and decarburized hydrogen is superheated to 185°C and then sent to the hydrogenation reactor 6, controlled The mol ratio of phenol and hydrogen in the gas mixture entering hydrogenation reactor 6 is 1:5; the mol ratio of hydrogen and nitrogen in the gas mixture entering hydrogenation reactor 6 is controlled to be 3:1;

[0040] (2) Control the temperature of the reaction material in the...

specific Embodiment 2

[0050] With above-mentioned embodiment 1, its difference is:

[0051] In step (1), the raw material phenol is heated to 120°C through the phenol preheater 1; the top pressure of the phenol vaporizer 2 is controlled to be 0.20MPaG; the gas mixture composed of phenol and decarburized hydrogen is superheated to 175 ℃; the molar ratio of phenol to hydrogen is 1:2, and the molar ratio of hydrogen to nitrogen is 5:1; during the preparation process of decarburized hydrogen: the raw material hydrogen with carbon oxide content of 20ppm is preheated by hydrogen preheater 4 After heating to 160°C, it is heated to 230°C by the hydrogen heater 5 and sent to the decarburization reactor 8; the decarburization reaction temperature is controlled at 235°C, and the pressure is controlled at 1.1MPaG.

[0052] In step (2), the temperature of the reaction material in the hydrogenation reactor 6 is controlled at 195° C., and the pressure is controlled at 0.1 MPaG.

[0053] In step (3), the hydrogen...

specific Embodiment 3

[0059] With above-mentioned embodiment 1, its difference is:

[0060] In step (1), the raw material phenol is heated to 140°C through phenol preheater 1; the top pressure of phenol vaporizer 2 is controlled to 0.25 MPaG; the gas mixture composed of phenol and decarburized hydrogen is superheated to 195 ℃; the molar ratio of phenol to hydrogen is 1:6, and the molar ratio of hydrogen to nitrogen is 2:1; wherein in the preparation process of decarburized hydrogen: the raw material hydrogen with carbon content of 30ppm is preheated to After 170°C, it is heated to 240°C by the hydrogen heater 5 and sent to the decarburization reactor 8; the decarburization reaction temperature is controlled at 245°C, and the pressure is controlled at 1.3MPaG.

[0061] In step (2), the temperature of the reaction material in the hydrogenation reactor 6 is controlled to be 180° C., and the pressure is controlled to be 0.2 MPaG.

[0062] In step (3), the hydrogenation reaction product is heat-exchang...

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Abstract

The invention discloses a method and system for producing cyclohexanone with phenol. The method is characterized by comprising the following steps that the raw material phenol is heated through a phenol preheater and then sent to a phenol vaporizer, mixed gas of the phenol and decarburized hydrogen is sent to a raw material superheater and sent to a hydrogenation reactor after superheating is conducted, in the hydrogenation reactor, hydrogen is added to the phenol to generate the cyclohexanone, a hydrogenation reaction product is sent to a hydrogenation reactor heat recovery heat exchanger for heat recovery and then sent to a dehydrogenation tower, hydrogen which does not react is separated, and a crude cyclohexanone product is obtained at the bottom of the dehydrogenation tower. The system comprises the phenol preheater, the phenol vaporizer, the raw material superheater, a hydrogen preheater, a hydrogen heater, the hydrogenation reactor, the hydrogenation reactor heat recovery heat exchanger, a decarburization reactor and the dehydrogenation tower. The system and method have the advantages that high-efficiency and high-selectivity hydrogenation preparation of the cyclohexanone with the phenol is achieved, the technological process is simple, and the product cyclohexanone is high in yield.

Description

technical field [0001] The invention relates to a method for producing cyclohexanone, in particular to a method and system for producing cyclohexanone from phenol. Background technique [0002] Cyclohexanone is a widely used chemical raw material, which plays an important role in industrial production and daily life. According to its use, cyclohexanone is divided into two categories: amide and non-amide, of which 70% is cyclohexanone for amide. Commonly used nylon 6 and nylon 66 are prepared from cyclohexanone. In addition, because cyclohexanone has the characteristics of high solubility and low volatility, it can be used as an organic solvent, that is, cyclohexanone for non-amide use. It is an ideal solvent for polymers such as nitrocellulose, nitrocellulose, polyurethane, vinyl chloride polymers and copolymers; cyclohexanone is mixed with other solvents to adjust the evaporation rate of the system; in the leather industry, cyclohexanone Hexanone can be used as a degreas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/00C07C49/403
CPCC07C45/006C07C49/403Y02P20/10Y02P20/129
Inventor 谷新春梅鑫卫维剑王爱芳苗延军陈发挥王宇光沈铁孟余爱平李艳霞
Owner SEDIN NINGBO ENG
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