Phase behavior in the solvent winterization of crude cottonseed oil in 85–15 acetone‐hexane mixture as related to reduction in refining loss and color

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Abstract
Summary: Fundamental physical chemical data have been obtained which indicate on a laboratory scale the feasibility and advantages of solvent winterization of crude cottonseed oil in 85–15 acetone‐hexane mixture. The results show the effect of oil‐solvent ratio, chilling temperature, duration of chilling, and the addition of adsorbents on the degree of winterization, the refining loss, and the color of the winterized oil. Crystallization is markedly inhibited by the presence of a phosphatide‐rich material in the crude oil, but this can be overcome by the proper control of the oil‐solvent ratio and temperature and by the addition of adsorbents. Winterization in this solvent with or without adsorbents results in the separation of a large proportion of the phosphatides, and a marked reduction in refining loss and color. The advantages of winterizing hexane‐extracted cottonseed oils before refining are discussed.