液膜萃取法从乌桕梓油甲酯中分离亚麻酸甲酯

发布时间：2018-05-23 14:13

  本文选题：液膜萃取 + 银离子　； 参考：《中国粮油学报》2017年10期

【摘要】：本试验结合了液膜萃取和银离子络合萃取亚麻酸甲酯的优点,原料为乌桕梓油甲酯,液膜为硝酸银的甲醇水溶液,反萃取剂为石油醚,考察了硝酸银浓度、甲醇含量、相间搅拌速度、级数对亚麻酸甲酯萃取收率和纯度的影响。液膜中硝酸银和甲醇浓度的增加有利于提高液膜通透性,相间搅拌速度的提高有利于加强相间传质,均有利于亚麻酸甲酯收率的提高,但甲醇浓度的增加会降低产品中亚麻酸甲酯纯度。当液膜由1.6 mol/L硝酸银,30%甲醇(体积比)和70%水(体积比)组成,相间搅拌转速300 r/min,萃取温度20℃时,一级液膜萃取的收率为31.4%,产品中亚麻酸甲酯的纯度为94.1%。相对于同等萃取条件下的普通溶剂萃取,一级液膜萃取的收率是四级普通萃取收率的10倍。
[Abstract]:In this experiment, the advantages of liquid membrane extraction and silver ion complexation for extraction of methyl linolenic acid were studied. The raw materials were methyl ester of Chinese tallow catalpa oil, the liquid membrane was methanol aqueous solution of silver nitrate, and the stripping agent was petroleum ether. The concentration of silver nitrate and the content of methanol were investigated. The effect of stirring speed and order on the extraction yield and purity of methyl linolenic acid. The increase of the concentration of silver nitrate and methanol in the liquid film is beneficial to the enhancement of the permeability of the liquid film, the increase of the speed of stirring between phases is conducive to the enhancement of mass transfer between phases, and the increase of the yield of methyl linolenic acid. However, the purity of methyl linolenic acid was decreased with the increase of methanol concentration. When the liquid membrane is composed of 30% methanol (volume ratio) and 70% water (volume ratio) of 1.6 mol/L silver nitrate, the stirring speed between phases is 300r / min, the extraction temperature is 20 鈩，

本文编号：1925087