Water → Sodium Behenate

Participants

Reaction Conditions

Reaction Steps

88 kg of recrystallized behenic acid, 422 L of distilled water, 49.2 L of an aqueous solution of NaOH having a concentration of 5 mol/L and 120 L of t-butyl alcohol were mixed and, then, while being kept stirring at 75° C. for 1 hour, allowed to react with one another to obtain a sodium behenate solution B. Apart from the sodium behenate solution B, 206.2 L of an aqueous solution (pH: 4.0) containing 40.4 kg of silver nitrate was prepared and maintained at 10° C. A reaction vessel charged with 635 L of distilled water and 30 L of t-butyl alcohol was maintained at 30° C. and, then, while being kept sufficiently stirring, charged with an entire quantity of the foregoing sodium behenate solution B and an entire quantity of the foregoing silver nitrate aqueous solution at a constant flow rate consuming 93 minutes 15 seconds and 90 minutes, respectively. At that time, the silver nitrate aqueous solution was solely added for 11 minutes after the addition of the silver nitrate aqueous solution was started. After that, the addition of the sodium behenate solution was started. For 14 minutes 15 seconds after the addition of the silver nitrate aqueous solution was completed, the sodium behenate solution was solely added. At that time, a temperature inside the reaction vessel was maintained at 30° C. and a solution temperature was maintained constant by means of an external temperature control. Further, piping of an addition system for the sodium behenate solution was warmed by circulating warm water in an outer part of a double-walled tube so that the solution temperature at an outlet of an addition nozzle tip was adjusted to be 75° C. Piping of an addition system of the aqueous silver nitrate solution was also heat-controlled by circulating cold water in an outer part of a double-walled tube. Positions where the sodium behenate solution and the aqueous silver nitrate solution were added were arranged symmetrically in relation to a stirring shaft in the center, and respective heights of the positions were adjusted such that they do not touch a reaction solution.

Provenance & Evidence