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Continuous preparation method of perfluoropolyether

A technology of perfluoropolyether and fluorine gas is applied in the field of continuous preparation of perfluoropolyether, which can solve the problems of large amount of fluorine gas, high safety risk and long reaction time, etc.

Active Publication Date: 2017-11-24
ZHEJIANG RES INST OF CHEM IND CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to be under high temperature and high pressure, and the amount of fluorine gas needs to be 6 times that of the raw material. The reaction time is long and the safety risk is large.

Method used

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  • Continuous preparation method of perfluoropolyether
  • Continuous preparation method of perfluoropolyether
  • Continuous preparation method of perfluoropolyether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] optional attachment figure 2 1 medium corning straight channel module (as a pre-mixing preheating module), 6 corning "heart-shaped" microchannel reaction modules, 1 corning straight channel module (as a quenching module) and 8 heat transfer modules, according to the attached image 3 The reaction process shown constitutes a continuous flow microchannel reaction system. Heat transfer oil is used as the reaction heat exchange medium. According to the forced heat transfer principle of the microchannel reactor, only two temperature measuring points are set at the reactor inlet and outlet. Before the reaction, the microchannel reaction system and connecting pipelines were dewatered and degreased respectively, and the system and connecting pipelines were passivated with fluorine gas using 5mol% fluorine-nitrogen mixed gas, and the air tightness inspection was carried out at 1.0MPa. by attaching image 3 The 1 liquid phase pump (such as diaphragm metering pump) in the system...

Embodiment 2

[0034] Use the same Corning microchannel reactor as in Example 1, and follow the same connection and control methods. In this example, the reaction conditions were changed.

[0035] Set the heat exchanger temperature to 70°C, that is, the reaction temperature, and set the reaction pressure to 0 MPa. Raw material CF 3 CF 2 CF 2 O(CF 2 CF(CF 3 )O) 52 CF(CF 3 )COOH (average weight-average molecular weight is about 8692), the feed rate is 16g / min, the feed rate of 20mol% fluorine-nitrogen mixed gas is 2.7g / min, and the molar ratio of fluorine gas to raw materials is 8:1. The reaction raw materials enter the "heart-shaped" micro-channel reaction module 4 after passing through the micro-channel premixing and preheating module 3, and the mixed gas of fluorine and nitrogen directly enters the "heart-shaped" micro-channel reaction module 4 through the gas mass flow meter, In the channel reaction module 4-9, the mixed gas of fluorine and nitrogen reacts with the raw materials. ...

Embodiment 3

[0037] Use the same Corning microchannel reactor as in Example 1, and follow the same connection and control methods. In this example, the reaction conditions were changed.

[0038] Set the heat exchanger temperature to 120°C, that is, the reaction temperature, and set the reaction pressure to 0 MPa. Raw material CF 3 CF 2 CF 2 O(CF 2 CF(CF 3 )O) 22 CF(CF 3 )COOH (average weight-average molecular weight is about 3982), the feed rate is 17g / min, the feed rate of 20mol% fluorine-nitrogen mixed gas is 1.7g / min, and the molar ratio of fluorine gas to raw materials is 2.1:1. The reaction raw materials enter the "heart-shaped" micro-channel reaction module 4 after passing through the micro-channel premixing and preheating module 3, and the mixed gas of fluorine and nitrogen directly enters the "heart-shaped" micro-channel reaction module 4 through the gas mass flow meter, In the channel reaction module 4-9, the mixed gas of fluorine and nitrogen reacts with the raw materials...

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Abstract

The invention discloses a method for continuously preparing perfluoropolyether by using a microchannel reactor. CF3CF2CF2O(CF2CF(CF3)O)<n-2>CF(CF3)COOH used as a raw material reacts with F2 to obtain the corresponding perfluoropolyether. The method provided by the invention has the advantages of high conversion rate, short reaction time and safe and controllable reaction, and is suitable for industrialized amplification.

Description

technical field [0001] The invention relates to a continuous preparation method of perfluoropolyether, in particular to a method for stabilizing the end group of perfluoropolyether carboxylic acid in a continuous flow microreactor. Background technique [0002] Perfluoropolyether (abbreviated as PFPE) is a high-molecular polymer. It is a colorless, odorless and transparent oily liquid at room temperature. It has the characteristics of heat resistance, oxidation resistance, radiation resistance, corrosion resistance, and non-combustibility. of lubricants. The acid fluoride end group and carboxylic acid end group in the molecular chain of perfluoropolyether are easy to decompose under high temperature conditions to generate volatile substances, causing a decrease in molecular weight, thereby limiting its application in high-tech fields. [0003] For the improvement of the stability of the acid fluoride end group and the carboxylic acid end group in the perfluoropolyether mole...

Claims

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Application Information

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IPC IPC(8): C08G65/00C07C41/18C07C43/12
CPCC07C41/18C08G65/00C08G2650/48C07C43/12
Inventor 肖恒侨章祺徐卫国陈慧闯
Owner ZHEJIANG RES INST OF CHEM IND CO LTD
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