Method for preparing 2, 4-butane sultone

Abstract

The invention relates to a method for preparing 2, 4-butane sultone, which comprises the following steps: A, by taking 1, 3-butanediol and hydrochloric acid as raw materials and strong basic resin as a catalyst, reacting to obtain a 3-chlorobutanol crude product, and carrying out reduced pressure distillation to obtain 3-chlorobutanol; b, taking 3-chlorobutanol and a sodium sulfite aqueous solution as raw materials, reacting to obtain a solution containing 3-hydroxy butane sodium sulfonate, and dehydrating under reduced pressure for later use; c, acidifying the material subjected to decompression dehydration with concentrated hydrochloric acid, cooling to room temperature, filtering, and concentrating filtrate to obtain a concentrated solution containing 3-hydroxybutane sulfonic acid; d, carrying out flash evaporation dehydration cyclization on the 3-hydroxy butane sulfonic acid concentrated solution to obtain a 2, 4-butane sultone crude product; and E, performing rectification treatment. The method has the advantages that the process route is simple, the condition is mild, the reaction substrate and the catalyst are cheap and easy to obtain, the strongly basic resin is used as the catalyst, the loss and the production cost of an intermediate reaction link are effectively reduced, the post-treatment is simple, and the product yield is more than 80%.

Description

technical field

[0001] The invention belongs to the field of fine chemical intermediate synthesis, in particular to a method for preparing 2,4-butane sultone. Background technique

[0002] 2,4-Butane sultone is a colorless or light yellow-red transparent liquid at room temperature, with a flash point of 93°C, a boiling point of 150°C (1.6kPa), and a relative density of 1.31. It is insoluble in water and can be mixed with various organic solvents. miscible. 2,4-Butane sultone is an organic sulfonic acid alkylating reagent and fine chemical intermediate with important application prospects, which can be used in the synthesis of (gemini) surfactants, photosensitive materials, pharmaceutical intermediates, and color dye enhancers. Sensitizers and daily chemicals, etc. In recent years, 2,4-butane sultone has been gradually active in the fields of electroplating intermediate synthesis and lithium ion battery additives, especially as an additive for secondary lithium ion batterie...

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