SYNTHETIC METHOD OF SUCCINONITRILE

摘要

The present invention relates to a synthesizing method of succinonitrile which is an additive of a lithium secondary battery electrolyte and comprises a step of adding KCN into a reaction solvent, stirring it for 25-35 minutes, and increasing the temperature up to 45-55°C; a step of dropping 1,2-dichloroethane for a reaction into the activated solution; a step of cooling the solution up to room temperature and removing salts; a step of primarily concentrating the reaction solution with removed salts to collect the reaction solvent and secondarily concentrating the same to obtain succinonitrile; and a step of reforming the succinonitrrile. It facilitates the control of moisture in final products, facilitates collecting solvent by because it does not use co-solvents, improves production yield by using a single solvent, increases purity by a impurity-crystalizing process and a layer-separating process, and has excellent reactivity at low temperatures.