Synthesis method for 2,3-dibromo-1,4-butylene glycol

Abstract

The invention discloses a synthesis method for 2,3-dibromo-1,4-butylene glycol. The invention aims to solve the technical problems of the prior art that the synthesis method for 2,3-dibromo-1,4-butylene glycol is complex, reaction conditions are harsh and unsafe, parameters are difficult to be controlled, production cost is high, product quality is low and use is limited. The synthesis method for2,3-dibromo-1,4-butylene glycol disclosed by the invention comprises the following steps: 1) adding a catalyst tetraethyl ammonium bromide into a dichloromethane solvent, and then dropwise adding liquid bromine while stirring, thereby acquiring a brominating agent tetraethyl ammonium bromide complex bromide; 2) adding butynediol into the dichloromethane solvent, triggering electrophilic addition reaction with the brominating agent tetraethyl ammonium bromide complex bromide prepared in the step 1), thereby generating 2,3-dibromo-1,4-butylene glycol; adding water for washing, cooling, separating 2,3-dibromo-1,4-butylene glycol crystal, and performing suction filtration, thereby acquiring a crude product of 2,3-dibromo-1,4-butylene glycol; 3) purifying the crude product of 2,3-dibromo-1,4-butylene glycol. The synthesis method provided by the invention can be widely applied to the technical field of chemical synthesis.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a synthesis method of 2,3-dibromo-1,4-butenediol. Background technique [0002] Polymer materials have been widely used in various fields of the national economy and in all aspects of people's lives. However, most polymer materials are combustible or combustible materials, and major fires are mainly caused by the ignition of polymer materials. Therefore, the research and development of high-quality, high-performance flame retardants has received increasing attention. [0003] 2,3-dibromo-1,4-butenediol is widely used in organic synthesis, pharmaceutical intermediates, used as a surfactant in the production of flux and solder paste, with high resistance and strong activity. Bright spots and full soldering have a certain effect; it is the best surface-active additive among all fluxes, and is widely used in high-precision electronic components as high-end env...

AI Technical Summary

Problems solved by technology

[0005] In addition, at present, the domestic production of 2,3-dibromo-1,4-butenediol production process, due to the addition reaction will produce a large number of exothermic reactions, generally rely on freezing and cooling for a cycle of 24 hours, and the temperature in the middle is difficult to control. High cost, poor appearance, low main content

The commonly used production process is to use 1,4 butynediol and bromine addition reaction conditions, the temperature is about 15 ℃, water is used as the solvent, and the reaction time is about 24 hours. Due to the high temperature of the reaction process, the temperature is difficult to control. Bromine It belongs to the amplification of tail gas emission, the crude product is not reused after dehydration, serious environmental pollution, low production efficiency, high cost and poor product performance

Moreover, most of the crystallization and purification of crude products use water as a solvent, and the obtained product is difficult to separate due to water solubility, isomers and by-products, low temperature makes it difficult to suction filter, high temperature affects product appearance quality, and solid-liquid separation mother liquor is difficult to reuse, resulting in Reduce the loss in the product process, reduce the yield, increase the cost and pollute the environment twice

Moreover, due to the low purity, poor appearance and high water content of the refined and purified products, it is quite difficult to dry at room temperature. At present, some domestic manufacturers use 60-70°C for drying treatment, and the resulting light yellow products make domestic production of high-end electronic chemicals The product is difficult to apply, and its content cannot meet the requirements of users