Patent ID: 11858881
Assignee: NIPPON SODA CO., LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A method for purifying a nitrile solvent, comprising:
bringing the nitrile solvent containing at least an imine and a conjugated diene as impurities into contact with an acidic aqueous solution having a pH of 3 or less;
bringing the nitrile solvent having been contacted with the acidic aqueous solution into contact with an aqueous sodium hydrogen sulfite solution;
bringing the nitrile solvent having been contacted with the aqueous sodium hydrogen sulfite solution into contact with an alkaline aqueous solution; and
bringing the nitrile solvent containing impurities, the nitrile solvent having been contacted with the acidic aqueous solution, the nitrile solvent having been contacted with the aqueous sodium hydrogen sulfite solution, or the nitrile solvent having been contacted with the alkaline aqueous solution, into contact with an oxidizing agent.