Sodium Hydroxide → Bis(2-ethylhexyl) sodium phosphate

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Reaction Steps

To a four neck flask of 200 ml are added 19.94 g (60 mmol) of di(2-ethylhexyl) phosphate [Starting Material A] and 12.0 g (60 mmol) of a 20% aqueous solution of sodium hydroxide at 20° C., which are agitated for 60 minutes to obtain an aqueous solution of sodium di(2-ethylhexyl) phosphate. Then, 80 g of ethanol is added to this solution and subsequently 17.87 g (20 mmol) of a 26.0% aqueous solution of lanthanum chloride is added at a dropping rate of 1 ml/min, which are further reacted at the same temperature for 0 minute with stirring, whereby lanthanum di(2-ethylhexyl) phosphate is gradually precipitated to cause white turbidity in the solution. The precipitates are dissolved by adding 80 g of cyclohexane to the solution with stirring. The reaction solution is left at rest to remove the separated water layer. After the washing with 25 ml of water three times, a reflux dehydrator is mounted onto the vessel to remove water and ethanol in the reaction solution through azeotropy with cyclohexane, and then the same procedure as in [Example 1] is conducted to obtain 53.8 g of a solution of lanthanum di(2-ethylhexyl) phosphate in cyclohexane having a concentration of about 40%. The analytical results are shown in Table 1.

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