Solubility of calcium soaps of gum rosin, rosin acids and fatty acids

Research paper by W. D. Pohle

Indexed on: 01 Dec '41Published on: 01 Dec '41Published in: Journal of the American Oil Chemists' Society


The solubility of calcium soaps of rosin acids and fatty acids have been determined and compared.The solubility of calcium soaps of rosin acids (d-pimaric, dihydroabietic, and l-abietic acids) present in gum rosin was found to be greater than that of the calcium soaps of the following saturated fatty acids: lauric, myristic, palmitic, and stearic acids.The calcium oleate was much more soluble than the calcium stearate.As the amount of hydrogen in the rosin acid molecule is increased, l-abietic to dihydroabietic to tetrahydroabietic acid, the solubility of the calcium soap is decreased.The author wishes to express his indebtedness to Dr. G. S. Jamieson and W. G. Rose of the Agricultural Chemical Research Division for the pure lauric, myristic, palmitic and stearic acid used in this study.