Method for preparing C11 perfluoroketone

Abstract

The invention discloses a method for preparing C11 perfluoroketone. The preparation method comprises the following specific steps: adding a hexafluoropropylene oxide trimer, a reaction solvent and basic salts into a reaction kettle, and carrying out stirring reaction at the temperature of 0DEG C for 1 to 2 hours; then introducing perfluorodipropionyl peroxides, raising the temperature to 75 to 155DEG C, and carrying out stirring reaction for 1 to 8 hours; cooling after reaction pressure has no change, opening the reaction kettle, separating out subnatant and distilling to obtain a product C11 perfluoroketone. According to the method disclosed by the invention, an environment-friendly treatment process is simplified, raw materials are easily obtained, the reaction yield is increased, simple operation and easiness in purification are realized, and enlarged production can be performed; the hexafluoropropylene oxide trimer, the perfluorodipropionyl peroxides and the basic salts are used as initial reactants; the initial reactants are subjected to one-step reaction to obtain a finished product; the reaction temperature is lower, the reaction speed is high, and the reaction yield is higher, so that the enlargement of the compound is easily realized.

Description

technical field [0001] The invention relates to the field of fluorine-containing fine chemicals, in particular to a method for preparing C11 perfluoroketone. Background technique [0002] High boiling C11 perfluoroketone (1,1,1,2,4,5,5,5-octafluoro-2,4-bis(1,1,2,2,3,3,3-heptafluoropropane Oxygen) 3-pentanone) is an important cleaning agent, which has the characteristics of high boiling point, low volatility, heat resistance and corrosion resistance. It is an important cleaning agent and can be widely used in the manufacture and cleaning of cutting-edge instruments and equipment . [0003] The preparation method of C11 perfluoroketone usually adopts hexafluoropropylene oxide dimer and perfluoron-propyl vinyl ether as starting raw materials, and under suitable reaction conditions, potassium fluoride or cesium fluoride is used as catalyst to catalyze After one step reaction, C11 perfluoroketone is obtained. As shown in the patent CN201511028330.2, hexafluoropropylene oxide (...

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Problems solved by technology

As shown in the patent CN201511028330.2, hexafluoropropylene oxide (HFPO) dimer is an important organic fluorine intermediate, which can be used to synthesize important organic fluorine products such as perfluoro-n-propyl vinyl ether and surfactants , but in the process of synthesizing HFPO dimer, a large amount of HFPO trimer is usually produced. This by-product has high toxicity, but the harmless treatment of it by conventional waste treatment will cause a substantial increase in production costs , so it is best to be able to recycle it and develop high value-added derivative products. This recycling process is a relatively difficult link in the entire production process. At present, there is no mature and feasible solution at home and abroad.

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