三元共沸物法提纯米糠蜡工艺条件的优化

摘要

Chose wax paste of rice bran oil processing by-products as raw materials,ethyl acetate-ethanol-water ternary azeotrope as solvent,extraction yield and acetone insoluble（purity）as index,after get rice bran wax by process of extraction[solvent∶ raw materials（v∶ m）,6∶ 1],centrifugal separation,rotating evaporation,low temperature drying.Rice bran wax extraction process condition was optimized through the response surface method.Results showed the best extraction condition was∶ solvent than was 6∶ 1,extraction temperature 65℃,45min for extraction time,cooling temperature was 20℃.At this time,model predicts extraction rate of rice bran wax was 89.65%,acetone insoluble was 64.30%,verifying test for extraction of rice bran wax was 89.17%,acetone insoluble was 63.67%,and basically consistent with the predicted value.%以米糠油加工的副产物蜡糊为原料,乙酸乙酯-乙醇-水三元共沸物为溶剂,以提取率和丙酮不溶物（纯度）为指标,经萃取[溶剂∶原料（v∶m）,6∶1]、离心分离、旋转蒸发、低温干燥制得米糠蜡;通过响应曲面法优化米糠蜡提取工艺条件。结果表明,最佳提纯条件为：料液比6∶1,提取温度65℃,提取时间45min,冷却温度20℃,此时,模型预测米糠蜡提取率为89.65%,丙酮不溶物为64.30%。验证实验得米糠蜡提取率为89.17%,丙酮不溶物为63.67%,与预测值基本吻合。