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Method for continuously preparing 2-trifluoromethyl-4, 5-dicyanoimidazole lithium salt and reaction device

A technology of dicyanoimidazole and trifluoromethyl, applied in the field of preparation of 2-trifluoromethyl-4,5-dicyanoimidazole lithium salt, achieving high efficiency

Active Publication Date: 2021-08-20
JIANGSU LEE & MAN CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The technical problem to be solved by the present invention is to overcome the deficiencies of the existing batch reaction, and provide a method and reaction equipment capable of continuous production and high efficiency for preparing lithium salt of 2-trifluoromethyl-4,5-dicyanoimidazole

Method used

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  • Method for continuously preparing 2-trifluoromethyl-4, 5-dicyanoimidazole lithium salt and reaction device
  • Method for continuously preparing 2-trifluoromethyl-4, 5-dicyanoimidazole lithium salt and reaction device
  • Method for continuously preparing 2-trifluoromethyl-4, 5-dicyanoimidazole lithium salt and reaction device

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Embodiment approach 1

[0031] This patent is further set forth below by implementing examples.

[0032] Add 250L of anhydrous acetonitrile in a 0.5m3 reaction desolventizer, and add 0.5t of diaminomaleonitrile, 1.02t of trifluoroacetic anhydride, and 1.67t of lithium carbonate into the aqueous phase suspension made from the header tanks 1, 2, and 3 respectively. Drop 0.5t of diaminomaleonitrile and 1.02t of trifluoroacetic anhydride into the reaction precipitation kettle, raise the temperature to 50°C, react and stir for 2 hours, remove acetonitrile and by-products by distillation under reduced pressure, and transfer the reaction solvent and by-products to the receiving kettle 5. After removal, add dropwise the aqueous phase suspension made of lithium carbonate, after the dropwise addition of the aqueous suspension made of lithium carbonate, continue to stir and react for 1 hour to obtain 2-trifluoromethyl-4,5-dicyanoimidazolium lithium Crude salt; 2-trifluoromethyl-4,5-dicyanoimidazole lithium salt...

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Abstract

The invention discloses a method for continuously preparing 2-trifluoromethyl-4, 5-dicyanoimidazole lithium salt, and a reaction device and belongs to the field of preparation of 2-trifluoromethyl-4, 5-dicyanoimidazole lithium salt. The method comprises the following steps of: generating 2-trifluoromethyl-4, 5-dicyanoimidazole from trifluoroacetic anhydride and diaminomaleonitrile; and making the 2-trifluoromethyl-4, 5-dicyanoimidazole to react with lithium carbonate so as to generate the 2-trifluoromethyl-4, 5-dicyanoimidazole lithium salt. In order to overcome the defects in existing intermittent reaction, the invention provides the method for preparing the 2-trifluoromethyl-4, 5-dicyanoimidazole lithium salt and the reaction equipment, the method can be used for continuous production and has relatively high efficiency.

Description

technical field [0001] The invention belongs to the field of preparation of 2-trifluoromethyl-4,5-dicyanoimidazole lithium salt, in particular to a method and a reaction device for continuously preparing 2-trifluoromethyl-4,5-dicyanoimidazole lithium salt . Background technique [0002] Fluorine-containing lithium salt is the main raw material of lithium battery electrolyte. At present, the most widely used fluorine-containing lithium salt with the highest market share is LiPF6 (lithium hexafluorophosphate). However, LiPF6 has problems such as poor thermal stability and chemical stability, and sensitivity to moisture. Therefore, it is necessary to synthesize new fluorine-containing lithium salts. For the electrolyte, the conductivity of the conductive lithium salt is the first factor to be considered. The anion structure directly affects the performance of the lithium salt. The larger the anion radius, the smaller the lithium salt lattice, the higher the solubility in orga...

Claims

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Application Information

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IPC IPC(8): C07D233/90
CPCC07D233/90Y02E60/10
Inventor 周旺鹰陶哲冯娜娜
Owner JIANGSU LEE & MAN CHEM
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