Method for preparing perfluoro alkene ether sulfonyl fluoride compound

Abstract

The invention relates to a method for preparing a perfluoro alkene ether sulfonyl fluoride compound. The method comprises the following steps: carrying out an addition reaction on perfluoroiodoacetyl fluoride and hexafluoropropylene oxide in a solvent, cracking the obtained material in a solvent to prepare a perfluoroiodo alkene ether monomer, carrying out a mild reaction on the monomer to prepare perfluoro alkene ether sulfite, chlorinating the perfluoro alkene ether sulfite by using a chlorination reagent to obtain perfluoro alkene ether sulfonyl chloride, and carrying out a mild phase transfer catalytic fluorination reaction on the perfluoro alkene ether sulfonyl chloride to prepare a required perfluoro alkene ether sulfonyl chloride monomer with a high yield. A general catalyst and mild reaction conditions are adopted in the whole reaction enforcement process, reaction raw materials involved in the reactions can be prepared by using present technologies or can be purchased in the market, yields of all the reactions under above conditions are high, and a mixture obtained in the invention can be separated by using present technologies, so the target product with the purity of 99% or above, used for polymerizing preparation of perfluorinated ion resin can be obtained.

Description

technical field [0001] The invention belongs to the field of fluorine-containing fine chemicals and relates to a method for preparing perfluoroalkene ether sulfonyl fluoride compounds. Background technique [0002] Since the 1970s and 1980s, the ionic membrane electrolytic caustic soda production method has been widely used in the chlor-alkali industry because of its low pollution, low energy consumption, high purity, and relatively simple operation. The heart of the electrolytic cell is the ionic membrane. This ionic membrane divides the electrolytic cell into a cathode chamber and an anode chamber. Since this type of membrane has bonded anions and exchangeable cations, the ions in the electrolyte can selectively pass through the membrane to achieve the purpose of electrolysis; although There are many kinds of polymers that can be used as ionic membranes, but the fluorine-containing ionic membranes with carboxylic acid and sulfonic acid groups are more suitable for use as i...

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Problems solved by technology

[0004] U.S. patent document US3232875A first announced the preparation of fluorine-containing alkenyl ether monomers containing sulfonyl fluoride end groups. The patent document was prepared by pyrolysis; The preparation of monomers with acyl fluoride terminal groups has a very low yield and is not suitable for industrial production; US patent document US4940525A discloses the preparation of perfluoroalkenyl ether sulfonyl by addition of pentafluoroepichlorohydrin and acyl fluoride at high temperature cracking The method of fluorine monomer, but the temperature is high and the raw material is difficult to obtain

However, the Chinese patent document CN101698654A prepares perfluoroalkene ether sulfonyl fluoride monomer by addition of sulfuric acid ester and acid fluoride with sulfonyl fluoride end groups under the action of a catalyst, but the preparation requirements of the catalyst are harsh; while the Japanese patent document JP2004196723A uses Similar route, but high-temperature cracking method is adopted during cracking, the amount of chlorine gas used during chlorination is large and the yield is too low during fluorination, which is not conducive to industrial production; British patent document GB1038190A first announced the cracking of perfluoroiodosyl fluoride, and also used Carrying out in a high-temperature manner will easily lead to unstable removal of iodine; Chinese patent document CN1726186A discloses the preparation of perfluoroalkenyl ether monomers whose end groups are sulfonyl fluorides by electrochemical fluorination, but this method has certain risks

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