响应面法优化小桐子油酸法脱胶预处理工艺

Optimization of acid-assisted degumming pretreatment of Jatropha curcas oil by response surface methodology

用于制备航空煤油的植物油含大量的胶质(以磷脂为主),需对其进行脱胶预处理。采用酸法脱胶研究了柠檬酸添加量、脱胶温度、加水量、搅拌转速、活性炭添加量、乙醇胺(MEA)添加量和MEA反应时间对小桐子油脱胶效果的影响。在单因素实验基础上,根据Box-Behnken中心组合实验设计原理,用响应面法优化工艺条件。结果表明:最佳工艺条件为质量分数45%的柠檬酸添加量2. 12%、MEA添加量0. 52%、MEA反应时间26. 23 min、搅拌转速258. 47 r/min、脱胶温度50℃、加水量2%、活性炭添加量2%,在此条件下,模型预测脱胶小桐子油磷含量为0. 61 mg/kg,实测值为0. 65 mg/kg,误差率为6. 55%,证明模型可靠。

The vegetable oil used for preparation of aviation kerosene contains a large amount of colloid(mainly phospholipid),which needs to be pretreated with degumming.By acid-assisted degumming,the effects of dosage of citric acid,degumming temperature,dosage of water,stirring speed,dosage of activated carbon,dosage of monoethanolamine(MEA)and MEA reaction time on degumming effect of Jatropha curcas oil were studied.On the basis of single factor experiment,the process conditions were optimized by response surface methodology according to Box-Behnken center combination experiment design principle.The results showed that the optimal process conditions were obtained as follows:dosage of 45%citric acid 2.12%,dosage of MEA 0.52%,MEA reaction time 26.23 min,stirring speed258.47 r/min,degumming temperature 50℃,dosage of water 2%and dosage of activated carbon 2%.Under these conditions,the predictive value and measured value of the phosphorus content in the degummed oil were 0.61 mg/kg and 0.65 mg/kg respectively,and the error rate was 6.55%,which proved that the model was reliable.