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| Optimization of preparation of high purity ethyl oleate by urea inclusion method |
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| KeyWord:high oleic acid peanut oil urea inclusion purity of ethyl oleate yield of ethyl ester |
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| Abstract: |
| Ethyl oleate has a high practical value in chemical, pharmaceutical and food industries. To meet the market demand for high purity ethyl oleate, the preparation process of high purity ethyl oleate by urea inclusion of fatty acid ethyl esters from high oleic acid peanut oil was researched. The effects of mass ratio of ethyl ester to urea, ratio of ethyl ester to 95% ethanol, reflux temperature, reflux time, crystallization temperature and crystallization time on the purity of ethyl oleate and yield of ethyl ester were studied. The response surface methodology was employed to optimize the purity of ethyl oleate and yield of ethyl ester after inclusion. The optimal preparation conditions were obtained as follows: mass ratio of ethyl ester to urea 1∶?1.2, ratio of ethyl ester to 95% ethanol 1∶?5, reflux temperature 50?℃, reflux time 30 min, crystallization temperature 22?℃, and crystallization time 1 h. Under these conditions, the purity of ethyl oleate was (90.82±004)% and its relative content was (90.82±0.04)%, and the yield of ethyl ester was (59.2±0.2)%. Thus, the process had certain reference value for the industrial production of high purity (90% or more) ethyl oleate. |
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