Docosanoic Acid → Potassium Behenate

Participants

Reaction Conditions

Reaction Steps

Using the apparatus shown in FIG. 7, particulate organic silver salt 6-1 was prepared in the following manner. Into a tank (501) containing 83.5 g of behenic acid and 1583.5 g of pure water with stirring at 85° C., 147.7 ml of 1.5N aqueous KOH solution was added in 5 min. and reacted further for 60 min. to obtain a potassium behenate solution. Finally, water was added to make the total amount to 2000 ml. To a tank (502), 2000 ml of aqueous solution containing 37.6 g of silver nitrate was added and maintained at 10° C. In FIG. 7, the numeral 33 designates the mixing device, as shown in FIG. 1(a). To the mixing device (33) in which a supply tube and a discharge tube each had an inside diameter of 4 mm, the foregoing potassium behenate solution and aqueous silver nitrate solution were supplied at a flow rate of 750 ml/min and allowed to undergo nucleation. During the nucleation, the silver potential was continuously measured by a sensor (508). The acceptable pH range was set within±0.05 and a switching valve was operated to allow solution to discharge through pass (511) outside of a tank (504) until the pH fell within the foregoing range. A steady state was attained 15 sec. from the start of addition and the switching valve (510) was concurrently operated to introduce formed nucleus particles into a tank (504). Further, when the total amount of formed nucleus particles reached 1500 ml, the switching valve (510) was operated to allow solution to discharge through the pass (511) outside of the tank (504). In FIG. 7, the numeral 508 designates a sensor for detecting various conditions such as temperature, silver potential, pH and pAg; the numeral 509 designates a control means constituted of a computer; the numerals 512 and 513 designate a flowmeter and a pump, respectively.

Provenance & Evidence