Bis(fluorosulfonyl)imide impurity removal and purification system and bis(fluorosulfonyl)imide impurity removal and purification method

A bis(fluorosulfonyl)imide impurity removal and purification system, which comprises a light-component stripping tank, a product buffer tank, an impurity removal reactor, and a film evaporator,

• wherein the light-component stripping tank is connected to a reaction product liquid supply source via a reaction product liquid conveying pipe and also connected to a light-component product recovery device via a light-component product recovery pipe;
• the product buffer tank is connected to the light-component stripping tank via a first heavy-component product conveying pipe;
• the impurity removal reactor is connected to the product buffer tank via a third heavy-component product conveying pipe and also connected to an impurity removal reactant supply source via an impurity removal reactant conveying pipe;
• and
• the film evaporator is connected to the impurity removal reactor via a product liquid conveying pipe, connected to a gas-phase separation system via a gas-phase product conveying pipe, and also connected to an impurity collection tank via an impurity conveying pipe, and wherein after a reaction liquid supplied from the reaction product liquid supply source to the light-component stripping tank is subjected to heating evaporation treatment, a light component product is conveyed to the light-component product recovery device via the light-component product recovery pipe, while a heavy-component product in the reaction liquid is conveyed to the product buffer tank via the first heavy-component product conveying pipe;
• a product liquid in the product buffer tank is conveyed to the impurity removal reactor via the third heavy-component product conveying pipe and undergoes an impurity removal reaction with an impurity removal reactant from the impurity removal reactant supply source conveyed via the impurity removal reactant conveying pipe;
• the product liquid having undergone the impurity removal reaction is conveyed to the film evaporator via the product liquid conveying pipe to undergo a film evaporation treatment, a gas-phase product obtained after the film evaporation treatment is conveyed to the gas-phase separation system via the gas-phase product conveying pipe, and a solid-containing slurry left by the film evaporation treatment is conveyed to the impurity collection tank via the impurity conveying pipe.