Stearic Acid → Zinc Stearate

Participants

Reaction Steps

To an aqueous solution of zinc chloride prepared by dissolving 22 g zinc chloride (containing 47.8% zinc) in 33 ml water, 300 g of a 9% aqueous acid sodium carbonate solution was added under stirring to produce an aqueous zinc carbonate dispersion containing 10.5 g zinc. This liquid was heated under stirring, and when the temperature reached 65° C., addition of granular stearic acid (melt initiating temperature 56° C.) was started. While the temperature was elevated over a 15-minute period, 90 g was added. When the addition was terminated, the temperature of the liquid was 72° C. Under slow heating, the reaction was continued for 40 minutes. When the reaction was accomplished, the temperature of the liquid was 76° C. Heating was then stopped, and zinc stearate generated in the upper layer of the reaction liquid was filtered off. It was washed with water 3 times, the quantity of water used for each time being 1000 ml. Thereafter, it was dried at 105° C. to obtain 100 g granular zinc stearate (melting point 120° C.) having an average grain diameter of about 1 mm. The zinc content of this product was 10.38%, and the yield relative to the zinc used was 98.9%.

Provenance & Evidence