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Preparation method, prepared ketene compound and application of compound

A technology for compounds and ketenes, applied in the field of compound preparation, can solve the problems of complex cracking products, reduced reaction conversion rate, low single-pass yield, etc., to improve the cracking reaction conversion rate, improve the reaction selectivity, and inhibit the cracking reverse reaction. Effect

Pending Publication Date: 2022-03-01
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The innovation of this patent is to directly dimerize the cracked products, which reduces equipment investment, but the introduction of a large amount of inert gas is not conducive to the collection of products, and the cooling equipment installed after the cracking reactor is a conventional tube or plate cooling device. It cannot be separated quickly with carboxylic acid or water, resulting in a reverse reaction and a decrease in the conversion rate of the reaction
[0005] The patent document whose publication number is CN110105186A solves the problem of by-products and carbon deposits caused by the further cracking of DMK by introducing low-carbon hydrocarbons and carrier gas into the feed, but this method will introduce other impurities in the product, and the cracked product is complicated. And the subsequent separation cost is high, which limits its industrial application
[0006] To sum up, the current production process of ketene compounds in the industry has a low single-pass yield and low purity, which affects the selectivity of downstream ketene compound polymerization reactions.

Method used

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  • Preparation method, prepared ketene compound and application of compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Isobutyric anhydride (purity 99%) is passed through feed pump 1 ( figure 1 shown) enters the preheater 2 at a rate of 4.46g / min, and the preheating temperature is 350°C. After the raw material is preheated and gasified, it enters the pyrolysis reactor 3 with a reaction temperature of 400°C and a reaction pressure of 10kPa. The high-temperature cracked gas is successively passed through two series-connected cyclone separators 4 with a wall temperature of 30° C., and nitrogen gas with a precooling temperature of 40° C. is passed into the cyclone separators at a rate of 3.2 L / min (the total moles of nitrogen are The amount is 5 times of the molar amount of the raw material), the liquid coming out from the cyclone separator is collected by the separation liquid storage tank 5, and the gas phase is sent to the washing tower 6, and reverse spray washing is carried out with cyclohexane as the washing agent. The gas phase coming out from the washing tower enters the collection...

Embodiment 2

[0053] Isobutyric anhydride (purity 99%) enters the preheater 2 at a rate of 29.1 g / min through the feed pump 1, and the preheating temperature is 300°C. After the raw material is preheated and gasified, it enters the pyrolysis reactor 3 with a reaction temperature of 500°C and a reaction pressure of 20kPa. The high-temperature cracked gas is successively passed through two series-connected cyclone separators 4 with a wall temperature of 25° C., and nitrogen gas with a precooling temperature of 25° C. The amount is 2 times of the molar amount of the raw material), the liquid coming out from the cyclone separator is collected by the separation liquid storage tank 5, and the gas phase is sent into the washing tower 6, and the reverse spray washing is carried out with n-hexane as the washing agent. The gas phase coming out of the washing tower enters the collection device 8, and the product DMK is collected with n-nonane as an absorbent to obtain a DMK solution with a mass concen...

Embodiment 3

[0056] Isobutyric anhydride (purity 99%) enters the preheater 2 at a rate of 3.7 g / min through the feed pump 1, and the preheating temperature is 310° C. After the raw material is preheated and gasified, it enters the pyrolysis reactor 3 with a reaction temperature of 460°C and a reaction pressure of 12kPa. The high-temperature cracked gas is successively passed through two series-connected cyclone separators 4 with a wall temperature of 35° C., and nitrogen gas with a precooling temperature of 30° C. is passed into the cyclone separators at a rate of 1.6 L / min (the total moles of nitrogen are The amount is 3 times of the molar amount of the raw material), the liquid coming out from the cyclone separator is collected by the separation liquid storage tank 5, and the gas phase is sent into the washing tower 6, and reverse spray washing is carried out with cyclohexane as the washing agent. The gas phase coming out of the washing tower enters the collection device 8, and the produ...

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Abstract

The invention provides a preparation method, a prepared ketene compound and application of the compound, the preparation method comprises the following steps: 1) high-temperature cracking: preheating and gasifying an organic acid or anhydride cracking raw material, and then carrying out high-temperature cracking to obtain high-temperature cracking gas; 2) gas-liquid separation: conveying the high-temperature cracked gas into a cyclone separator for gas-liquid rapid separation; and (3) collecting a product: absorbing a gas-phase product from the cyclone separator through an absorbent or condensing the gas-phase product, and collecting the gas-phase product to obtain the ketene compound. According to the method, the cyclone separator is used for carrying out rapid gas-liquid separation on the cracking product, so that the reverse reaction of the gas-phase product due to overlong retention time in the liquid phase can be effectively avoided.

Description

technical field [0001] The invention relates to a preparation method of a compound, in particular to a preparation method, a prepared enone compound and the application of the compound. Background technique [0002] Enone compound (R-C=C=O) is a special kind of unsaturated ketone, because it contains accumulated double bonds, its chemical properties are very active, and it is easy to undergo addition and polymerization reactions. It is an important intermediate in organic synthesis. The preparation methods of enone compounds mainly include high-temperature cracking of carboxylic acid or carboxylic anhydride, dehalogenation of α-acyl halide compounds, etc. Among them, the dehalogenation of α-acyl halide compounds has complex steps, large amount of solvent, and many by-products. Problem, at present, carboxylic acid or carboxylic acid anhydride is usually produced by pyrolysis of carboxylic acid or carboxylic anhydride at high temperature to prepare ketene compounds. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/89C07C45/90C07C49/88C07C45/76C07C49/39
CPCC07C45/89C07C45/90C07C49/88C07C45/76C07C2601/04C07C49/39
Inventor 杨志超孙康华卫琦黎源
Owner WANHUA CHEM GRP CO LTD
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