Sodium Hydroxide → Magnesium stearyl phosphate

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Water (19 L) was added to stearyl phosphate (molar ratio of diester/monoester=1/2.7; acid value, 231.7 mg KOH/g) (1 kg) while heating at 70° C., whereby the stearyl phosphate was dispersed uniformly. An aqueous solution of sodium hydroxide (500 g/L) (331 ml) was dropwise added to the mixture while keeping the said temperature. When the addition was finished, the mixture showed a pH of about 11.5. An aqueous solution of magnesium sulfate (300 g/L) (846 ml) was gradually added thereto at a temperature of 60° to 70° C. After the addition was finished, the mixture was stirred at 60° C. for 90 minutes. On confirming that the remaining magnesium ion in water became constant, the reaction was finished. The product was collected, washed, dried at 75° C. for 72 hours and then pulverized by the aid of a hammer mill to give magnesium stearyl phosphate (1014.1 g). Yield, 97%. M.P., 210° to 215° C. Apparent specific volume, 5.0 ml/g. Elementary analysis: calcd., P=7.1%, Mg=4.8%; found, P=7.0%, Mg=4.6%.

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