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System and method for continuously preparing acetophenone

A technology of acetophenone and ethylbenzene, which is applied in the field of continuous preparation of acetophenone, and can solve problems such as low economic efficiency and hazardous waste generation

Pending Publication Date: 2022-03-01
天津精分科技发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction of this method is a weight loss reaction, and the economy is lower than that of ethylbenzene as a raw material, and lye needs to be added as a slow-release agent, which will generate hazardous waste.

Method used

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  • System and method for continuously preparing acetophenone
  • System and method for continuously preparing acetophenone
  • System and method for continuously preparing acetophenone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Apply above-mentioned method and system continuous production acetophenone, this example adopts single-stage reactive distillation system, a kind of concrete flow process is as follows:

[0032] Add 1wt% vanadyl acetylacetonate catalyst to ethylbenzene, pressurize it into the ejector through the raw material pump, and control the flow rate to 0.5m 3 / / h, then enter the reaction preheater through the static mixer, the outlet temperature of the preheater is 135°C, and finally enter the middle of the reactive distillation column. The diameter of the reactive distillation tower is 800mm, the height of the tower is 25200mm, the inner parts of the tower are three-dimensional spray trays, the distance between the trays is 450mm, and the number of trays is 40 layers. The control cycle flow rate of the tower kettle material is 60m 3 / h, the temperature of the circulating liquid is strictly controlled to 140°C through the cooler and heater, and the control pressure of the reacti...

Embodiment 2

[0038] Apply above-mentioned method and system to continuously produce acetophenone, this example adopts two-stage series reaction rectification system, concrete flow process is as follows:

[0039] Add 1wt% vanadyl acetylacetonate catalyst to ethylbenzene, pressurize it into the injector through the raw material pump, and control the flow rate to 1m 3 / / h, then enter the reaction preheater through the static mixer, the outlet temperature of the preheater is 135°C, and finally enter the middle part of the first-stage reaction tower. The diameter of the primary reaction tower is 1000mm, the height of the tower is 23500mm, the inner part of the tower is a three-dimensional jet tray, the distance between the trays is 500mm, and the number of trays is 30 layers. The control cycle flow rate of the tower kettle is 80m 3 / h, the temperature of the circulating fluid is strictly controlled to 120°C through the cooler and heater, and the control pressure of the primary reaction tower i...

Embodiment 3

[0042] Apply the above-mentioned method and system to continuously produce acetophenone, and this example adopts a three-stage series reaction rectification system, and the specific process is as follows:

[0043] Add 1wt% vanadyl acetylacetonate catalyst to ethylbenzene, pressurize it into the injector through the raw material pump, and control the flow rate to 1m 3 / / h, then enter the reaction preheater through the static mixer, the outlet temperature of the preheater is 135°C, and finally enter the middle part of the first-stage reaction tower. The diameter of the primary reaction tower is 1000mm, the height of the tower is 23500mm, the inner part of the tower is a three-dimensional jet tray, the distance between the trays is 500mm, and the number of trays is 30 layers. The controlled circulating flow rate of the tower kettle is 80m3 / h, the temperature of the circulating liquid is strictly controlled at 140°C through the cooler and heater, and the controlled pressure of the...

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Abstract

The invention provides a system and a method for continuously preparing acetophenone, which are characterized in that ethylbenzene is used as a raw material and is sequentially subjected to at least one stage of rectification reaction; in each stage of rectification reaction, the material is fully mixed with part of gas phase to enter a reaction rectification tower and is in contact reaction with gas phase rising from the bottom in the tower, a mixed gas phase mainly containing water and ethylbenzene is extracted from the tower top, condensation and phase splitting are performed, an oil phase in condensate returns to the tower top, a water phase in the condensate is extracted as wastewater, and the water phase in the condensate is recycled. One part of the reaction liquid extracted from the tower kettle is fed into the next-stage rectification reaction, the other part of the reaction liquid is returned to the upper part of the reactive distillation tower as a circulating material through temperature control, and the part of the reaction liquid extracted from the tower kettle in the last-stage rectification reaction, which is not used as the circulating material, is extracted as a product. The method has the characteristics of good reaction selectivity, no generation of hazardous waste, energy conservation, environmental protection, continuous operation, easiness in large-scale production and the like.

Description

technical field [0001] The invention relates to the field of organic compound synthesis, in particular to a system and method for continuously preparing acetophenone, which adopts multi-stage serial reaction distillation to continuously prepare acetophenone. Background technique [0002] Acetophenone, also known as methyl phenyl ketone and acetophenone, is an important chemical raw material. Is the simplest aromatic ketone, in which the benzene ring is directly connected to the carbonyl. It exists in the essential oils of some plants in a free state. It is a colorless crystal or light yellow oily liquid with a pungent smell like the aroma of hawthorn. It is an intermediate widely used in the production of fragrances, and can be used as an organic solvent mixed with other solvents. It can also be used in medicine and has hypnotic properties. [0003] The usual production methods of acetophenone have the following three methods: (1) Friedel-Crafts acylation reaction, that i...

Claims

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Application Information

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IPC IPC(8): C07C45/36C07C45/82C07C49/78
CPCC07C45/36C07C45/82C07C49/78Y02P20/10
Inventor 张明韩彬李晓平关健王耀
Owner 天津精分科技发展有限公司
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