Clean preparation process for hexafluropropylene oxide

A technology of hexafluoropropylene oxide and hexafluoropropylene is applied in the field of green preparation of hexafluoropropylene oxide, and can solve problems such as the destruction of atmospheric ozone layer

Active Publication Date: 2005-07-06
SINOCHEM LANTIAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problem that the existing hexafluoropropylene oxide preparation method has a dest...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 500g of supercritical HFC-227ea and 100g of hexafluoropropylene into a 1-liter stainless steel reactor with stirring, and gradually raise the temperature to 120°C. After stabilizing the temperature for half an hour, slowly introduce oxygen until the partial pressure of oxygen reaches 0.2MPa Oxygen was then stopped. Due to the exothermic reaction, the reaction temperature and pressure rise, so the oxygen should be fed again after the reaction temperature and pressure are recovered and stabilized, and the partial pressure of oxygen is controlled to be 0.2MPa. Oxygen was fed repeatedly in this way, and the reaction product was analyzed by gas chromatography after 12 hours. The calculated conversion rate of hexafluoropropylene was 99.4%, the selectivity of hexafluoropropylene oxide was 43.5%, and no reaction induction period was observed.

Embodiment 2

[0023] The reaction apparatus and operating conditions are the same as in Example 1, but the supercritical fluid is changed to HFC-143a to obtain a conversion rate of 89.1% of hexafluoropropylene, and the selectivity of hexafluoropropylene oxide is 34.4%. It is observed that the reaction has 3 hours induction period.

Embodiment 3

[0025] The reaction device and operating conditions are the same as in Example 1, but the supercritical fluid is changed to HFC-134a, and the reaction time is 10 hours. The obtained conversion rate of hexafluoropropylene was 96.8%, the selectivity of hexafluoropropylene oxide was 44.3%, and an induction period of 2 hours was observed for the reaction.

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Abstract

The invention discloses an environmental protection method for preparing hexafluropropylene oxide from hexafluoropropylene by dioxygen liquid phase oxidation method. The method employs at least one supercritical fluid as solvent for replacing the CFCs with destructive effect to atmospheric ozone layer. The supercritical fluid as solvent is used in the invention which can reduce induction period of reaction and prevent the temperature raise in short time at the beginning of reaction.

Description

technical field [0001] The invention relates to a green preparation technology of hexafluoropropylene oxide, which uses supercritical fluid as a solvent to prepare hexafluoropropylene oxide by liquid-phase oxidation of hexafluoropropylene. technical background [0002] Hexafluoropropylene oxide is an important fluorine-containing intermediate and an important raw material for the production of hexafluoroacetone, perfluoroisopropanol, perfluoropolyether and perfluorovinyl ether. [0003] There are many preparation methods of hexafluoropropylene oxide, such as photochemical oxidation and radiochemical oxidation. Patent GB1034492 and patent UK931578 have introduced that hexafluoropropylene can be oxidized to generate hexafluoropropylene under the triggering of light and different ionizing radiation sources. However, this method has unfavorable factors such as complex equipment and relatively dangerous reactions. In addition, patent US3775438 and patent JP52053804 also reported...

Claims

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Application Information

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IPC IPC(8): C07D305/04
CPCY02P20/54
Inventor 张建君徐宇威徐卫国陈先进
Owner SINOCHEM LANTIAN
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