Water → Sodium Behenate

Participants

Reaction Steps

In an amount of 876 g of behenic acid (Edenor C22-85R, trade name, manufactured by Henkel Co.), 4230 mL of distilled water and 1200 mL of tert-butanol were added with 492 mL of 5 mol/L aqueous solution of NaOH at 75° C. over 5 minutes with stirring, and allowed to react for 60 minutes to obtain a solution of sodium behenate. Separately, 2062 mL of an aqueous solution containing 404 g of silver nitrate (pH 4.0) was prepared and kept at 10° C. Further, a reaction vessel containing 6350 mL of distilled water and 300 mL of tert-butanol was maintained at 30° C., and added with the whole volume of the aqueous silver nitrate solution at a constant flow rate with stirring. After 7 minutes, the whole volume of the sodium behenate solution was added. The addition times of the aqueous silver nitrate solution and the sodium behenate solution in this operation were 60 minutes and 62 minute, respectively. Therefore, during the last 9 minutes, only the aqueous sodium behenate solution was added. After completion of the addition, 216 ml of 20 weight % aqueous solution of sodium diisobutylnaphthalenesulfonate was added. The mixture was left as it was with stirring for 20 minutes to lower the temperature to 25° C. The obtained aqueous dispersion of organic acid silver salt showed pH of 6.3.

Provenance & Evidence