Water → Sodium Behenate

Participants

Reaction Conditions

Reaction Steps

Behenic acid (trade name: Edenor C22-85R) (87.6 g) manufactured by Henckel Co., 423 ml of distilled water, 49.2 ml of a 5 N aqueous solution of NaOH and 120 ml of tert-butanol were mixed, and stirred at 75° C. for 1 hour to conduct the reaction, thereby obtaining a sodium behenate solution. Separately, 206.2 ml of an aqueous solution containing 40.0 g of silver nitrate (pH 4.0) was prepared, and the temperature thereof was kept at 10° C. A reaction vessel in which 635 ml of distilled water and 30 ml of tert-butanol were placed was kept at a temperature of 30° C., and the sodium behenate solution previously prepared and the aqueous solution of silver nitrate were wholly added thereto at a constant flow rate for 62 minutes and 10 seconds and for 60 minutes, respectively. At this time, only the aqueous solution of silver nitrate was added for 7 minutes and 20 seconds after the start of addition of the aqueous solution of silver nitrate. Thereafter, addition of the sodium behenate solution was started, and only the sodium behenate solution was added for 9 minutes and 30 seconds after addition of the aqueous solution of silver nitrate was completed. At this time, the temperature in the reaction vessel was adjusted to 30° C., and the temperature of the outside was controlled so that the liquid temperature was not elevated. Further, a pipe of an addition system of the sodium behenate solution was lagged with steamed jacket, and the opening of a valve for steam was controlled so that the liquid temperature at an outlet of a tip of an addition nozzle became 75° C. Further, a pipe of an addition system of the aqueous solution of silver nitrate was lagged by circulating cool water in the outer space of a double pipe. A position of adding the sodium behenate solution and a position of adding the aqueous solution of silver nitrate are arranged symmetrically centered on a stirring shaft, and at such a height that they do not come into contact with the reaction solution.

Provenance & Evidence