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Method for preparing dimethyl ketene rapid separation product by taking isobutyric anhydride as raw material

A technology of dimethyl ketene and isobutyric anhydride, which is applied in the preparation of ketene, the device in which the axial direction of the swirl can be reversed, the swirl device, etc., can solve the loss of DMK, reduce the space-time yield of DMK, and increase production Cost and other issues, to achieve the effect of controlling residence time, reducing losses, and improving heat exchange efficiency

Active Publication Date: 2020-12-15
ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methods for separating DMK disclosed in the above-mentioned patents are rapid condensation separation, but the reverse reaction between DMK and isobutyric acid to generate isobutyric anhydride during the condensation process will cause a large amount of DMK loss, thereby reducing the space-time yield of DMK and increasing production costs

Method used

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  • Method for preparing dimethyl ketene rapid separation product by taking isobutyric anhydride as raw material
  • Method for preparing dimethyl ketene rapid separation product by taking isobutyric anhydride as raw material
  • Method for preparing dimethyl ketene rapid separation product by taking isobutyric anhydride as raw material

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Embodiment 1

[0037] Such as figure 1 As shown, the feed rate of raw material liquid (isobutyric anhydride) is regulated to 1.6ml / min by liquid inlet pump and flowmeter, and the nitrogen flow rate is regulated to 160ml / min by gas flowmeter, isobutyric anhydride (purity 99%) After being mixed with nitrogen, it enters the preheater, and after being heated and vaporized by the preheater, the temperature rises to 320°C, and then it is passed into the cracking reactor for high-temperature cracking reaction under high-temperature cracking conditions, wherein the temperature of the cracking reactor is 450°C . The pressure of the cracking reactor is controlled by a German Vacuubrand PC 3001 vacuum pump, and the pressure is in the range of 3-70Kpa. In Example 1, the temperature of the refrigerant in the external heat exchange jacket of the gas-liquid cyclone separator is -5°C, the temperature of the built-in cooling coil is -5°C, the ratio of the curved inner diameter Dr of the cooling coil to the ...

Embodiment 2

[0039] Such as figure 1 As shown, the feed rate of raw material liquid (isobutyric anhydride) is regulated to 1.6ml / min by liquid inlet pump and flowmeter, and the nitrogen flow rate is regulated to 160ml / min by gas flowmeter, isobutyric anhydride (purity 99%) After being mixed with nitrogen, it enters the preheater, and after being heated and vaporized by the preheater, the temperature rises to 320°C, and then it is passed into the cracking reactor for high-temperature cracking reaction under high-temperature cracking conditions, wherein the temperature of the cracking reactor is 450°C . The pressure of the cracking reactor is controlled by a German Vacuubrand PC 3001 vacuum pump, and the pressure is in the range of 3-70Kpa. In Example 2, the temperature of the refrigerant in the external heat exchange jacket of the gas-liquid cyclone separator is 40°C, the temperature of the built-in cooling coil is 40°C, the ratio of the curved inner diameter Dr of the cooling coil to the ...

Embodiment 3

[0041] Such as figure 1 As shown, the feed rate of raw material liquid (isobutyric anhydride) is regulated to 1.6ml / min by liquid inlet pump and flowmeter, and the nitrogen flow rate is regulated to 160ml / min by gas flowmeter, isobutyric anhydride (purity 99%) After being mixed with nitrogen, it enters the preheater, and after being heated and vaporized by the preheater, the temperature rises to 320°C, and then it is passed into the cracking reactor for high-temperature cracking reaction under high-temperature cracking conditions, wherein the temperature of the cracking reactor is 450°C . The pressure of the cracking reactor is controlled by a German Vacuubrand PC 3001 vacuum pump, and the pressure is in the range of 3-70Kpa. In Example 3, the temperature of the refrigerant in the external heat exchange jacket of the gas-liquid cyclone separator is 10°C, the temperature of the built-in cooling coil is 10°C, the ratio of the curved inner diameter Dr of the cooling coil to the ...

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Abstract

The invention relates to the field of chemical engineering, and discloses a method for preparing a dimethyl ketene rapid separation product by using isobutyric anhydride as a raw material, which comprises the following steps: preheating isobutyric anhydride and a carrier, introducing the preheated isobutyric anhydride and carrier into a cracking reactor, reacting, and directly introducing a gas-phase product into a gas-liquid cyclone separator with a heat exchange jacket from the cracking reactor; collecting a liquid-phase product obtained by separation; and allowing the gas-phase product obtained through separation to enter an absorption tower to recover the dimethyl ketene. According to the invention, the high-temperature cracking product directly enters the gas-liquid cyclone separatorwith the heat exchange component after being discharged from the cracking reactor, so that the product is separated while being condensed, the residence time of the gas-phase product is controlled, the loss of the product in the condensation separation process is reduced, and the yield of the target product is improved.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing a rapid separation product of dimethyl ketene by using isobutyric anhydride as a raw material. Background technique [0002] Dimethylketene (DMK) is an important intermediate in organic synthesis. Its molecular structure is highly unsaturated and can undergo reactions such as addition, decomposition and polymerization. It is a raw material for the production of various fine chemicals. For the preparation of dimethyl ketene, currently, fatty acids or fatty acid anhydrides are produced by high-temperature pyrolysis in industry to prepare dimethyl ketene. However, the separation of dimethyl ketene has always been the key to limit its yield. How to improve the separation efficiency of dimethyl ketene and reduce its loss in the separation process is an important technical problem. [0003] Patents US2936324, US US3227764, US5169994 and US5258556 disclose the me...

Claims

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Application Information

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IPC IPC(8): C07C45/89C07C45/90C07C49/88B04C5/20
CPCC07C45/89C07C45/90B04C5/20C07C49/88Y02P20/10
Inventor 时强成有为易磊刘严王韩张新平杨磊邱敏茜
Owner ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD