[S:1]([C:5]1[C:6]([O:8]C(=O)C=1)=[O:7])([OH:4])(=[O:3])=[O:2].[CH2:12]([OH:15])[CH2:13][OH:14].[OH-:16].[Na+:17].[CH3:18][C:19](C)=[O:20]>O>[OH:20][CH:19]([O:14][CH:13]([CH:5]([S:1]([OH:4])(=[O:2])=[O:3])[C:6]([O-:8])=[O:7])[C:12]([O-:16])=[O:15])[CH3:18].[Na+:17].[Na+:17].[Na+:17]Sulfomaleic anhydride (20 gm) is mixed with 37.2 gm (0.6 mole) of ethylene glycol and heated at 80°C for 4 hours. A solution of 16 gm (0.4 mole) of sodium hydroxide in 75 ml of water is then added and the mixture heated at 80°C for 4 hours. The mixture is then mixed with acetone to precipitate trisodium α-hydroxyethoxy-β-sulfosuccinate, which is purified by repeated extractions with hot acetone to remove all ethylene glycol and water followed by filtration and drying in an oven.
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