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Method for synthesizing bromoethylene carbonate

A technology of ethylene carbonate and bromination, applied in the direction of organic chemistry, can solve the problems of immature synthesis process of brominated ethylene carbonate, and achieve the effects of low cost, easy availability of raw materials, and mild operating conditions

Inactive Publication Date: 2018-11-23
SINOPHARM CHEM REAGENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The object of the present invention is to provide a method for synthesizing bromoethylene carbonate, to solve the problem that bromoethylene carbonate is not yet mature, suitable for industrialized production, and an environmentally friendly synthesis process

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  • Method for synthesizing bromoethylene carbonate

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Embodiment 1

[0030] A method for synthesizing bromoethylene carbonate, comprising the following steps:

[0031] (1) Take by weighing ethylene carbonate 89.4g (1 mole), succinimide 10g (0.1 mole), sodium bromide 110g (1.06 mole) and water 400ml to form solution A;

[0032] (2) Add 300ml of dichloromethane to solution A, and adjust the temperature to 20±3°C;

[0033] (3) Control the temperature at 20±3°C, stir and add sodium hypochlorite dropwise (effective concentration is 10%, 1.1 mole) under UV light, and the dropping time is 60 minutes;

[0034] (4) dropwise, insulation reaction under UV light for 60 minutes; In the product obtained, the organic phase contained bromoethylene carbonate, and the aqueous phase contained inorganic salts and succinimide;

[0035] (5) Wherein, the organic phase is a dichloromethane solution containing bromoethylene carbonate, washed with water 3 times, adding 20ml of water each time;

[0036] (6) The crude product was refined to obtain 161 g of bromoethylene...

Embodiment 2

[0038] A method for synthesizing bromoethylene carbonate, comprising the following steps:

[0039] (1) Take by weighing ethylene carbonate 89.4g (1 mole), succinimide 8g (0.08 mole), sodium bromide 104g (1.0 mole) and water 400ml to be made into solution A;

[0040] (2) Add 300ml of dichloromethane to solution A, and adjust the temperature to 20±3°C;

[0041] (3) Control the temperature at 20±3°C, stir and add sodium hypochlorite (effective concentration is 10%, 1 mole) dropwise under UV light, and the dropping time is 90 minutes;

[0042] (4) dropwise, insulation reaction under UV light for 120 minutes; In the product obtained, the organic phase contained bromoethylene carbonate, and the aqueous phase contained inorganic salts and succinimide;

[0043] (5) Wherein, the organic phase is a dichloromethane solution containing bromoethylene carbonate, washed with water 3 times, adding 20ml of water each time;

[0044] (6) The crude product was refined to obtain 159 g of bromoet...

Embodiment 3

[0046] A method for synthesizing bromoethylene carbonate, comprising the following steps:

[0047] (1) Take by weighing ethylene carbonate 89.4g (1 mole), succinimide 12g (0.12 mole), sodium bromide 124.5g (1.2 mole) and water 400ml to make solution A;

[0048] (2) Add 300ml of dichloromethane to solution A, and adjust the temperature to 20±3°C;

[0049] (3) Control the temperature at 20±3°C, stir and add sodium hypochlorite dropwise under UV light (effective concentration is 10%, 1.2 moles), and the dropping time is 30 minutes;

[0050] (4) dropwise, insulation reaction under UV light for 30 minutes; In the product obtained, the organic phase contained bromoethylene carbonate, and the aqueous phase contained inorganic salts and succinimide;

[0051] (5) Wherein, the organic phase is a dichloromethane solution containing bromoethylene carbonate, washed with water 3 times, adding 20ml of water each time;

[0052] (6) The crude product was refined to obtain 165 g of bromoethyl...

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Abstract

The invention relates to the technical field of chemical synthesis and particularly relates to a method for synthesizing bromoethylene carbonate. The method comprises the following steps: taking ethylene carbonate as raw material, taking NBS newly generated by reaction of succinimide, sodium bromide and sodium hypochlorite in the process as a reagent, and carrying out bromination in dichloromethane phase under illumination to generate an intermediate which is bromoethylene carbonate. The raw materials used in the method are easily available and are free of toxicity; easily-volatile toxic substance which is bromine is not used; the operating condition is mild; the cost is low; the yield is high.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular to a synthesis method of bromoethylene carbonate. Background technique [0002] Ethylene carbonate (EC) is a kind of organic solvent with excellent performance, which can dissolve various polymers; it can also be used as an organic intermediate, which can replace ethylene oxide for dioxygenation reaction, and is used to produce carbonic acid by transesterification. The main raw material of dimethyl ester; it can also be used as a raw material for the synthesis of furazolidone, water glass slurry, fiber finishing agent, etc.; in addition, it is also used in lithium battery electrolyte. Ethylene carbonate is also used as a reactive intermediate in the production of lubricating oils and greases. [0003] Chloroethylene carbonate is mainly used in the preparation of lithium battery electrolyte fluoroethylene carbonate and vinylene carbonate. High-purity chloroethylene carbo...

Claims

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Application Information

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IPC IPC(8): C07D317/42
CPCC07D317/42
Inventor 郭建国凌芳秦建国宋忠哲
Owner SINOPHARM CHEM REAGENT
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