[CH2:1]([C:3]([CH3:5])=[O:4])[CH3:2].[OH:6][CH2:7][CH:8]([CH2:10]O)[OH:9].O.C1(C)C=CC(S(O)(=O)=O)=CC=1.C(=O)([O-])[O-].[Na+].[Na+]>CCCCCC>[CH3:5][C:3]1([CH2:1][CH3:2])[O:9][CH:8]([CH2:7][OH:6])[CH2:10][O:4]1In a reaction vessel having a capacity of 3 L and equipped with a thermometer, a reflux condenser, a Dean-Stark trap, a calcium chloride tube and a stirrer, methyl ethyl ketone (400 g, 5,547 mol), glycerin (561.91 g, 6.102 mol), paratoluene-sulfonic acid monohydrate (21.10 g, 0.1109 mol) and hexane (400 mL) were charged. The contents were heated under stirring and a reaction was conducted at 67 to 74° C. for 30 hours to distill off a calculated amount of water. After completion of the reaction, the reaction mixture was cooled to 60° C., followed by the addition of sodium carbonate (23.51 g, 0.2218 mol) for neutralization. After the resulting mixture was stirred at 60° C. for 30 minutes, the temperature was gradually raised up to 120° C. to recover hexane (400 mL). Filtration was then conducted to obtain the titled product in a crude form (894.74 g). Using a Biglew tube (20 cm×1.5 cm in diameter), distillation was conducted under reduced pressure to obtain the titled compound (725.14 g, yield: 89.4%). By a gas chromatographic analysis, the purity of the compound was found to be 99.1 wt. %. b.p. 101 to 104° C./17 mmHg.
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