Water → Sodium Behenate

Participants

Reaction Steps

Behenic acid (EDENOR C22-85R manufactured by Henkel, 87.6 g), 423 liters of distilled water, 49.2 liters of an NaOH aqueous solution having a concentration of 5 mol/liter, and 120 liters of tert-butanol were mixed and reacted at 75° C. for 1 hour with stirring to obtain a sodium behenate solution. Separately, 206.2 liters (pH 4.0) of an aqueous solution containing 40.4 kg of silver nitrate was prepared, and maintained at 10° C. A reaction vessel charged with 635 liters of distilled water and 30 liters of tert-butanol was maintained at 30° C., and the total amount of the sodium behenate solution and the total amount of the silver nitrate aqueous solution were added at a fixed flow rate over a period of 93 minutes 15 seconds and over a period of 90 minutes respectively while being fully stirred. At this time, for 11 minutes after starting the addition of the silver nitrate aqueous solution, the silver nitrate aqueous solution alone was added. Then the addition of the sodium behenate solution was started. For 14 minutes 15 seconds after completing the addition of the silver nitrate aqueous solution, the sodium behenate solution was added alone. At this time, the temperature inside the reaction vessel was set at 30° C., and the temperature was externally controlled such that the liquid temperature was constant. Further, the temperature of piping for the addition of the sodium behenate solution was controlled by circulating hot water at an outer side of a double tube, and liquid temperature at an outlet at the tip of an addition nozzle was adjusted to 75° C. The temperature of piping for addition of the silver nitrate aqueous solution was controlled by circulating cold water at an outer side of a double tube. The position at which the sodium behenate solution was added and the position at which the silver nitrate aqueous solution was added were arranged symmetrically about a stirring shaft, and the heights were adjusted so as not to contact the reaction solutions.

Provenance & Evidence