[C:1]1(=[O:7])[O:6][C:4](=[O:5])[CH:3]=[CH:2]1.[OH-:8].[K+:9].[OH2:10].OO>[O-][W]([O-])(=O)=O.[Na+].[Na+].O>[O:8]1[CH:3]([C:4]([O-:10])=[O:5])[CH:2]1[C:1]([O-:6])=[O:7].[K+:9].[K+:9]A 2-liter three-neck flask was charged with 280 g of maleic anhydride and 428 ml of ultrapure water for dissolution. To the aqueous solution, 500 g of 48 wt % potassium hydroxide aqueous solution was added dropwise using a dropping funnel with cooling to keep the temperature at room temperature. Then, 18.8 g of sodium tungstate was added, and subsequently 332 g of 35% hydrogen peroxide water was added dropwise. The mixture was stirred for about 30 minutes, and 115 g of 48 wt % potassium hydroxide aqueous solution was gradually added. In this case, the flask was quickly cooled to keep the reaction temperature at 55 to 65° C. Then, the reaction mixture was kept at 65 to 60° C. for 30 minutes, to obtain a potassium epoxysuccinate aqueous solution. The aqueous solution was cooled to room temperature and concentrated to 300 ml, and it was poured into 1 liter of acetone. The produced precipitate was secured by filtration, for isolation as potassium epoxysuccinate.
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