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Method for synthesizing small-molecular-weight acyl fluoride through oxidative cracking of low-molecular-weight perfluoropolyether waste at high temperature

A technology of perfluoropolyether and low molecular weight, which is applied in the fields of organic chemistry and acyl halide preparation. It can solve the problems of low reaction temperature, poor practical usability, and high price of rare earth oxides, so as to achieve efficient utilization and multiple utilization and reduce environmental damage. , The effect of small environmental burden

Pending Publication Date: 2022-03-08
浙江诺亚氟化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not need to add other catalysts that are harmful to the environment, and the reaction temperature is relatively low, but the actual usability of this method is relatively poor, there are many kinds of catalysts, and the price of rare earth oxides is high, and the product obtained is methanol, which is not economical. value, poor practicality
[0023] In addition, in the pyrolysis technology of the prior art, the main purpose is usually only to crack the raw material, and the components in the obtained cracked gas are usually relatively complicated, and it is difficult to obtain cracked gas products with high economic value.

Method used

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  • Method for synthesizing small-molecular-weight acyl fluoride through oxidative cracking of low-molecular-weight perfluoropolyether waste at high temperature
  • Method for synthesizing small-molecular-weight acyl fluoride through oxidative cracking of low-molecular-weight perfluoropolyether waste at high temperature
  • Method for synthesizing small-molecular-weight acyl fluoride through oxidative cracking of low-molecular-weight perfluoropolyether waste at high temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Pump 1.3kg K-type perfluoropolyether (average molecular weight 1100) into the vaporization chamber through a peristaltic pump for preheating and vaporization. The flow rate is controlled by a flow controller at 4g / min. The temperature in the vaporization chamber is 200°C. After vaporization, the K-type The perfluoropolyether raw material and oxygen (oxygen flow rate: 30mL / min) are passed into the reaction furnace for high-temperature oxidative cracking reaction. The temperature of the reaction furnace is controlled at 500°C. The reaction residence time is 44s. After the reaction, the pyrolysis gas flow is pre-cooled to below 80°C and then passed into the absorption liquid (the absorption liquid is a mixture of methanol and triethylamine) to absorb and form a sample detection liquid. The excess gas insoluble in the absorption liquid ( including excess oxygen) is collected by air pockets. After the reaction, the weight of the absorbent liquid increased by 1.19 kg, and the...

Embodiment 2

[0069] Pump 1.3kg Z-type perfluoropolyether (average molecular weight 1000) into the vaporization chamber through a peristaltic pump for preheating and vaporization. The flow rate is controlled by a flow controller at 4g / min. The temperature in the vaporization chamber is 200°C. After vaporization, the Z-type The perfluoropolyether raw material and oxygen (oxygen flow rate: 30mL / min) are passed into the reaction furnace for high-temperature oxidative cracking reaction. The temperature of the reaction furnace is controlled at 500°C. The reaction residence time is 44s. After the reaction, the pyrolysis gas flow is pre-cooled to below 80°C and then passed into the absorption liquid (the absorption liquid is a mixture of methanol and triethylamine) for absorption to form a sample detection liquid. The excess gas is collected with an air bag. After the reaction, the weight of the absorption liquid increased by 1.205kg, and the weight of the air bag increased by 0.08kg. The gaseous...

Embodiment 3

[0073] Pump 1.3kg D-type perfluoropolyether (average molecular weight 1100) into the vaporization chamber through a peristaltic pump for preheating and vaporization. The flow rate is controlled by a flow controller at 4g / min. The temperature in the vaporization chamber is 200°C. After vaporization, the D-type The perfluoropolyether raw material and oxygen (oxygen flow rate: 30mL / min) are passed into the reaction furnace together for high-temperature oxidative cracking reaction. The temperature of the reaction furnace is controlled at 500°C. The reaction residence time is 44s. After the reaction, the pyrolysis gas flow is pre-cooled to below 80°C and then passed into the absorption liquid (the absorption liquid is a mixture of methanol and triethylamine) for absorption to form a sample detection liquid. The excess gas is collected with an air bag. After the reaction, the weight of the absorbent liquid increased by 1.201 kg, and the weight of the air bag increased by 0.095 kg. ...

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Abstract

The invention discloses a method for synthesizing small-molecular-weight acyl fluoride by oxidative cracking of low-molecular-weight perfluoropolyether waste at high temperature, which comprises the following steps: by taking the low-molecular-weight perfluoropolyether waste as a raw material, carrying out oxidative cracking reaction on the low-molecular-weight perfluoropolyether waste and oxidizing medium gas at high temperature, and cracking a long carbon chain of a polymer to generate small-molecular-weight (C1-C4) acyl fluoride at the reaction temperature of 400-700 DEG C, the reaction retention time is 10-200s, the oxidation medium is oxygen or ozone, and the product is controllably cracked into high-value products such as carbonyl fluoride, perfluoroacetyl fluoride, perfluoropropionyl fluoride and perfluorobutyryl fluoride. According to the method, high-value acyl fluoride gas can be obtained through thermal cracking, the method can be applied to the fields of cleaning agents, etching agents, pesticide intermediates, fluorine-containing material monomers and the like in the electronic industry, low-molecular-weight perfluoropolyether waste can be further effectively utilized, circulation of green chemical engineering is achieved, and environmental damage is reduced.

Description

technical field [0001] The invention relates to the field of fluorine chemical industry, in particular to a method for synthesizing low molecular weight acyl fluoride by oxidative cracking of low molecular weight perfluoropolyether waste at high temperature. Background technique [0002] The "shielding" effect of the C-F bond in the perfluoropolyether molecule on the main chain makes it have very high chemical inertness, non-flammability, oxidation resistance, corrosion resistance and radiation resistance, and its thermal stability, lubricity and insulation properties Significantly better than hydrocarbon polyethers. As a lubricant, only perfluoropolyether has a service temperature range of -100 to 400 ° C, and there is almost no shear thinning phenomenon, and it still maintains a constant viscosity even at a very high shear rate and remains low. volatility. Because its molecule does not contain chlorine, it is used in high-load bearings and will not corrode the bearings d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/58C07C53/46C07C53/48
CPCC07C51/58C07C53/46C07C53/48
Inventor 陈华峰韩文锋刘兵杨宇航别超陶杨谢遵运卢洪武陈爱民
Owner 浙江诺亚氟化工有限公司
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