Preparation method of pentafluorophenyl methanesulfonate

Abstract

The invention discloses a preparation method of pentafluorophenyl methanesulfonate. The preparation method comprises the steps of with methane sulfonic anhydride as a sulfonating reagent, dissolving methane sulfonic anhydride into an organic solvent for later use; dissolving pentafluorophenol into the organic solvent, simultaneously adding an acid-binding agent, dropwise adding the organic solventdissolved with methane sulfonic anhydride so as to prepare a pentafluorophenyl methanesulfonate crude product, and purifying and drying the crude product, so as to obtain a pentafluorophenyl methanesulfonate finished product. The preparation method has the beneficial effects that the use risk of highly toxic chemicals is avoided, and the sulfonating reagent, namely methane sulfonic anhydride, isa white crystalline solid and is convenient to transport and store; the reaction activity of methane sulfonic anhydride is between the reaction activities of methylsufonyl chloride and methanesulfonicacid, and reaction conditions are mild; chloride ions are not generated in the reaction, so that the purifying difficulty of the chloride ions is reduced, and the purifying cost is lowered; and besides, the purifying process is simple, and hydrolysis of sulfonate is reduced by virtue of an ice water extraction manner, so that the yield is increased.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a preparation method of pentafluorophenyl methanesulfonate. Background technique [0002] With the rapid development of the new energy industry, the market share of lithium-ion batteries is gradually increasing, and the importance of lithium battery materials is becoming increasingly prominent. In the development of lithium-ion battery electrolytes, in order to adapt to the development conditions of high specific energy and high voltage, research on new electrolyte additives for high nickel high voltage and silicon carbon negative electrodes has become a hot spot. [0003] Fluoroethylene carbonate (FEC) is an excellent additive that can well form an SEI film on the surface of the negative electrode, prevent the embedding of solvent molecules in the graphite negative electrode, and protect the negative electrode material. However, with the increase in energy density requirements,...

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Problems solved by technology

[0007] However, this method has the following disadvantages: firstly, methanesulfonyl chloride is a flammable liquid and is a highly toxic chemical, which has many safety hazards during transportation, use and storage; secondly, the reactivity of methanesulfonyl chloride is too high. High, it is difficult to control in the reaction, and it is easy to cause danger; third, it is easy to introduce chloride ions in the reaction process, and chloride ions are very harmful to lithium-ion batteries, and the purification cost is relatively high

The reaction activity of this method is too low, and the reaction conversion rate is low, resulting in great difficulty in purification.

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