Mass Transfer Modeling of α‐Eleostearic Acid from Tung Oil Concentration by Low‐Temperature Crystallization

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Abstract
With the significant attention paid to α‐eleostearic acid (α‐ESA) in a variety of biologically beneficial effects, the demand for high‐concentration products is increasing. A method of cryogenic separation to predict the mass variation of α‐ESA from tung oil was established in this study. The results showed that the best α‐ESA crystallization condition was −20 °C in ethanol, which implied a low energy consumption when compared with the common crystallization temperature of −60 °C. The α‐ESA concentration in the liquid phase was reduced by 90.4% compared to tung oil, and most of the α‐ESA in the solution was recovered by mass transfer. On the other hand, a mathematical model based on the diffusion reaction theory is used in mass variation prediction. The effects of temperature and time on the mass variation in α‐ESA in solution crystallization were examined. The results showed that the proposed model could estimate the composition and total mass of winterized tung oil at R 2 =0.974. The model was validated by experiments with an error of ±10%.
Funding Information
  • Preparation and Popularization of Oil Olive Leaf Feed Additive (CAFYBB2017ZD004)
  • Study on Green Preparation Technology of High Purity Eleostearic Acid (17 A174)

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