Method for preparing hexafluoroacetone by isomerizing hexafluoropropylene oxide

A technology of hexafluoropropylene oxide and hexafluoroacetone, which is applied in the preparation of heterocyclic compounds and organic chemistry, can solve the problems of complex preparation, many catalyst components, and high reaction temperature, and achieve simple preparation, low requirements for reaction conditions, and highly selective effect

Active Publication Date: 2020-05-08
TIANJIN CHANGLU CHEM NEW MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

U.S. Patent US2004186322 uses TiO2 as a catalyst, and US6933413 uses SnO2 as a catalyst. Although a higher yield is obtained, the required reaction temperature is still high
The catalyst reported in Chinese patent CN1899692A can be composed of Cr2O3, AlF3, TiO2, graphite or metal powder, and can react under normal temperature and pressure, but the catalyst components are many and the preparation is complicated

Method used

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  • Method for preparing hexafluoroacetone by isomerizing hexafluoropropylene oxide
  • Method for preparing hexafluoroacetone by isomerizing hexafluoropropylene oxide
  • Method for preparing hexafluoroacetone by isomerizing hexafluoropropylene oxide

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Embodiment

[0016] Embodiment: Preparation of catalyst: Dry ZSM-5 molecular sieve (silicon-aluminum ratio is 50) in an oven at 120° C. for 4 hours, take 10 g and put it in a tube furnace, feed N2 to heat up to 350° C., and change to R22 gas, Flow rate is 30ml / min, fluoride for 4 hours, change to N2 and cool down to room temperature. Tablets take 20-40 mesh as the catalyst.

[0017] Hexafluoropropylene oxide catalytic isomerization prepares hexafluoroacetone: the reaction test is carried out in a fixed bed reactor, a stainless steel reaction tube (inner diameter 10mm, length 300mm), catalyzer 5.0ml (20-40 mesh) is loaded into, and the reaction temperature is 20°C, 60°C, 100°C, 150°C, 200°C, the operating pressure is normal pressure, and the reaction space velocity is 300h-1. The reaction product is analyzed and determined by a gas chromatography analysis method, and then passed into deionized water for absorption to generate hexafluoroacetone hydrate. The reaction results are shown in Ta...

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Abstract

The invention belongs to the field of fluoride preparation, and particularly relates to a method for preparing hexafluoroacetone through isomerizing hexafluoropropylene oxide. The method specificallycomprises the following steps: filling a reactor with a catalyst, introducing the reaction raw material gas hexafluoropropylene oxide, carrying out a reaction at a reaction pressure of normal pressure, a reaction temperature of 0-200 DEG C and a reaction space velocity of 100-600 h <-1 >, and introducing the product into ionized water after the reaction is finished so as to obtain hexafluoroacetone hydrate. According to the method disclosed by the invention, high-purity hexafluoroacetone can be obtained by isomerizing the hexafluoropropylene oxide, almost no by-product is formed, the selectivity is high, the reaction can be carried out at low temperature and normal pressure, and the requirement on reaction conditions is low. Meanwhile, the catalyst used in the invention is simple to prepare, easily available in raw materials, easy to form and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of preparation of fluorides, and in particular relates to a method for preparing hexafluoroacetone by isomerizing hexafluoropropylene oxide. Background technique [0002] Hexafluoroacetone (CF3COCF3, HFA for short) is a fluorine-containing fine chemical with a wide range of uses. It was reported in the literature for the first time in 1957. In the 1960s, it was successfully piloted by Allied Chemical Company and Du Pont Company of the United States. Due to the strong electron-withdrawing properties of the two -CF3 groups, the physical and chemical properties of HFA are very different from those of acetone, and it also has unique physical and chemical properties. Hexafluoroacetone can be used in the fields of medicine, pesticides and synthetic materials, especially as a raw material for the synthesis of polymer materials in special fields. Among them, hexafluoroacetone has been used as a raw material for advanced solv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/167C07C45/58
CPCC07C45/58C07C49/167
Inventor 陈爽徐雅硕王博张志君
Owner TIANJIN CHANGLU CHEM NEW MATERIAL CO LTD
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