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Energy-saving efficient isopropenyl acetate synthesis method

A technology of isopropylene acetate and a synthesis method, which is applied in the preparation of ketene, ketene/polyketene, organic chemistry, etc., can solve the problems of low production efficiency, low reaction efficiency, small contact surface, etc., and achieves improved production efficiency. efficiency, improve reaction efficiency, reduce the effect of side reactions

Active Publication Date: 2016-07-20
衢州伟荣药化股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this process, vinyl ketone is a gas, acetone is a liquid, the gas-liquid reaction is not a homogeneous reaction, and the reaction efficiency is low due to the small contact surface; a large amount of acetone is used as the reaction liquid and absorption liquid, and finally the acetone extraction product must be concentrated, which consumes a lot of energy. Low production efficiency

Method used

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  • Energy-saving efficient isopropenyl acetate synthesis method

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preparation example Construction

[0025] The present invention is a kind of energy-saving and high-efficiency isopropenyl acetate synthetic method, comprises the following steps:

[0026] (1) Put acetic acid into a container, the container is a stainless steel tube, and then heat up the acetic acid to 500-800°C, so that acetic acid is catalytically cracked in the container to generate ketene gas, and the reaction temperature of catalytic cracking is 700-800°C, reaction pressure 200-600mmH, pass the generated ketene gas into the cooler, then add water at 10-35°C to the cooler for preliminary cooling of the ketene gas, ketene and water The molar ratio is: (2.5~3.5):1, and the dripping speed of water is 40ml / min.

[0027] (2) Put the acetone solution into the mixing dish, the mol ratio of the acetone solution and vinyl ketone is: 2:(0.95~1.5), drop the catalyst into the mixing dish simultaneously, the mol ratio of the catalyst and the acetone solution is: (0.8~ 1.5): 1. After mixing and stirring evenly, use a me...

Embodiment 1

[0033] Put the acetic acid into the stainless steel tube, and then heat the acetic acid to 700°C, so that the acetic acid will be catalytically cracked in the stainless steel tube to generate ketene gas, and the generated ketene gas will be passed into the cooler, and then Add water at 15°C to the cooler for preliminary cooling of ketene gas. The molar ratio of ketene to water is 2.7:1, and the dropping rate of water is 40ml / min.

[0034] Put the acetone solution into the mixing dish, the molar ratio of the acetone solution and vinyl ketone is: 2:1, put the catalyst into the mixing dish at the same time, the molar ratio of the catalyst and the acetone solution is: 0.8:1, after mixing and stirring for 30min, use The metering pump pumps the mixed liquid into the cooler, so that the mixed liquid can further cool the ketene gas obtained from the cracking reaction, and the mixed liquid is evaporated into gas at the same time.

[0035] Adjust the temperature of the cooler so that th...

Embodiment 2

[0039] Put the acetic acid into the stainless steel tube, and then heat the acetic acid to 730°C, so that the acetic acid will undergo catalytic cracking in the stainless steel tube to generate ketene gas, pass the generated ketene gas into the cooler, and then Add water at 20°C to the cooler for preliminary cooling of the ketene gas. The molar ratio of ketene to water is 3.1:1, and the dropping rate of water is 40ml / min.

[0040] Put the acetone solution into the mixing dish, the molar ratio of the acetone solution and vinyl ketone is: 2:1.1, put the catalyst into the mixing dish at the same time, the molar ratio of the catalyst and the acetone solution is: 0.95:1, after mixing and stirring for 45min, use The metering pump pumps the mixed liquid into the cooler, so that the mixed liquid can further cool the ketene gas obtained from the cracking reaction, and the mixed liquid is evaporated into gas at the same time.

[0041] Adjust the temperature of the cooler so that the tempe...

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Abstract

The invention discloses an energy-saving efficient isopropenyl acetate synthesis method which comprises the following steps: (1) feeding acetic acid into a container, performing heating treatment on the acetic acid so as to generate an ethenone gas from the acetic acid in a catalytic cracking manner, introducing the ethenone gas into a cooler; (2) feeding an acetone solution into a mixing dish, simultaneously feeding a catalyst into the mixing dish, mixing, uniformly stirring, pumping the mixed liquid into the cooler by using a metering pump; (3) conveying the mixed gas in the cooler into a synthesis reaction tower, and enabling the mixed gas to generate a reaction gas in the synthesis reaction tower; and (4) condensing the generated reaction gas so as to obtain a coarse product, refining the coarse product, cooling, crystallizing and drying, thereby obtaining a product. According to the energy-saving efficient isopropenyl acetate synthesis method disclosed by the invention, the ethenone gas and the acetone steam are enabled to have homogeneous reaction directly, so that the reaction efficiency is effectively improved, the transfer amount of acetone is greatly reduced, and the comprehensive utilization rate is increased.

Description

technical field [0001] The invention relates to a method for synthesizing energy-saving and high-efficiency isopropenyl acetate. Background technique [0002] Isopropenyl acetate, colorless, transparent liquid, flash point: 18°C, melting point: -92.9°C, boiling point: 92-94°C, density: 0.913g / cm3, miscible in alcohol, ether, ketone, etc., stable in nature . In industry, it is mainly used for the synthesis of acetylacetone, and is also used as an analytical reagent; in medicine, it is mainly used as a refined solvent for Fuchuang products. [0003] [0004] agent. The structural formula is as follows: [0005] The commonly used synthesis method of isopropenyl acetate is: catalytic cracking of acetic acid at a high temperature of 700-800°C to generate ketene, the cooled and purified ketene gas is passed into the acetone solution heated to reflux in the reactor, and the ketene dissolves In acetone and under the action of a catalyst, it can be esterified with acetone to g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/46C07C69/145C07C45/89C07C49/90
CPCC07C45/89C07C67/46C07C69/145C07C49/90Y02P20/10
Inventor 严招春
Owner 衢州伟荣药化股份有限公司
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