The method for preparing hexafluoroacetone by isomerization of hexafluoropropylene oxide
A technology of hexafluoropropylene oxide and hexafluoroacetone is applied in the preparation of heterocyclic compounds, organic chemistry, etc., can solve the problems of complex preparation, high reaction temperature, many catalyst components, etc., and achieves simple preparation, high selectivity, high Reaction conditions require low effect
Active Publication Date: 2022-07-05
TIANJIN CHANGLU CHEM NEW MATERIAL CO LTD
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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
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[0016] Embodiment: the preparation of catalyst: ZSM-5 molecular sieve (silicon-aluminum ratio is 50) is dried in oven at 120 DEG C for 4 hours, take 10g and put it into tube furnace, pass N2 and be heated up to 350 DEG C, change R22 gas, The flow rate was 30ml / min, fluorination was carried out for 4 hours, and the temperature was changed to room temperature through N2. Tablet take 20-40 mesh as catalyst.
[0017] Hexafluoroacetone is prepared by catalytic isomerization of hexafluoropropylene oxide: the reaction test is carried out in a fixed-bed reactor, a stainless steel reaction tube (inner diameter 10mm, length 300mm) is loaded with 5.0ml of catalyst (20-40 mesh), and the reaction temperature is 20℃, 60℃, 100℃, 150℃, 200℃, the operating pressure is normal pressure, and the reaction space velocity is 300h-1. The reaction product is analyzed and determined by gas chromatography, and then absorbed into deionized water to generate hexafluoroacetone hydrate. The reaction resul...
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The invention belongs to the field of preparation of fluorides, in particular to a method for preparing hexafluoroacetone by isomerization of hexafluoropropylene oxide. It specifically includes the following steps: filling the catalyst into the reactor, and feeding the reaction raw material gas hexafluoropropylene oxide to carry out the reaction, the reaction pressure is normal pressure, the reaction temperature is 0-200°C, and the reaction space velocity is 100-600h ‑1 , after the reaction is completed, the product is passed into ionized water to obtain hexafluoroacetone hydrate. According to the method of the present invention, high-purity hexafluoroacetone can be obtained by isomerizing hexafluoropropylene oxide, almost no by-products are formed, the selectivity is high, and the reaction can be carried out at low temperature and normal pressure, and the requirement for reaction conditions is low. At the same time, the catalyst used in the present invention is simple to prepare, easy to obtain raw materials, easy to shape and large-scale production.
Description
technical field [0001] The invention belongs to the field of preparation of fluorides, in particular to a method for preparing hexafluoroacetone by isomerization of 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, and it was successfully piloted by Allied Chemical Company and Du Pont Company in the United States in the 1960s. Due to the strong electron-withdrawing properties of the two -CF3 groups, the physicochemical properties of HFA are very different from those of acetone, and at the same time, it also has unique physicochemical properties. Hexafluoroacetone can be used in the fields of medicine, pesticides and synthetic materials, especially as a raw material for synthesizing polymer materials in special fields. Among them, it has been used as a raw material for high-grade solvent hexafluorop...
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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