脂肪酸汚れの洗浄におけるオレイン酸の挙動

概要

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It has been shown in a previous paper that each component of a fatty acid mixture containing equal amounts of lauric, myristic, palmitic, stearic, and oleic acids is removed in the order of C12>C14>C18 : 1> C16≥C18, C12>C14>C16≥C18>C18 : 1 at 25°C and 50°C, respectively, from cotton fabrics by an alkaline solution of sodium dodecylbenzenesulfovate. In this paper, the removal of each component of the mixture has been examined at 3°C and 10°C and the behavior of oleic acid in the removal of the soil mixture has been explained on the basis of the thermal characteristic of the mixture using the differential scanning calorimeter. Each component of the mixture was removed in the order of C12>C18 : 1>C14>C16≥C18 at 3°C and 10°C. The endothermic melting curve of the mixture gave triple peaks near 5°C, 20°C, and 40°C and the mixture melted at 41.0°C. It was found that oleic acid took the phase separating within the mixture because a peak near 5°C shows the melting of oleic acid. Therefore, it is considered that the phase transition of the mixture accompanied by the increase in temperature changes the order of oleic acid in each fatty acid removal.
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