Reaction #56601

Reaction equation

behenic acid

water

NaOH

→

sodium behenate

Solvents

t-butyl alcohol

Conditions

Workup

1. 1
   OtherThe mixture was reacted

Procedure

The recrystallized behenic acid (88 kg), 422 liters of distilled water, 49.2 liters of aqueous NaOH solution in a concentration of 5 mol/liter, and 120 liters of t-butyl alcohol were mixed. The mixture was reacted by stirring at 75° C. for one hour to obtain a sodium behenate solution B. Separately, 206.2 liters (pH 4.0) of an aqueous solution containing 40.4 kg of silver nitrate was prepared and kept at 10° C. A reactor containing 635 liters of distilled water and 30 liters of t-butyl alcohol was kept at 30° C. and while thoroughly stirring, the entire amount of the sodium behenate solution B obtained above and the entire amount of the aqueous silver nitrate solution prepared above were added as constant double jets, which took 93 minutes and 15 seconds and 90 minutes, respectively. At this time, only the aqueous silver nitrate solution was added for 11 minutes after the initiation of addition of the aqueous silver nitrate solution, then addition of the sodium behenate solution B was started, and only the sodium behenate solution B was added for 14 minutes and 15 second after the completion of addition of the aqueous silver nitrate solution. During the addition, the temperature inside the reactor was kept at 30° C. and the outer temperature was controlled to make constant the system temperature. The pipe line for the sodium behenate solution B was thermally insulated by circulating hot water through the interspace of the double-walled pipe, and the steam opening was so controlled that the temperature of the liquid at the outlet of the nozzle tip could be 75° C. The pipe line for the aqueous silver nitrate solution was thermally insulated by circulating cold water through the interspace of the double-walled pipe. Regarding the position at which the sodium behenate solution B is added to the reaction system and that at which the aqueous silver nitrate solution is added thereto, the two were disposed symmetrically to each other relative to the shaft of the stirrer disposed in the reactor, and the nozzle tips for the two solutions were spaced from the reaction liquid in the reactor.

Source