甲基戊烷四级逆流浸出膨化大豆料

Four-stage countercurrent extraction of oil from expanded soybean by methylpentane

分别以正己烷、甲基戊烷为浸出溶剂,采用四级逆流浸出方式从浸出效果、浸出油品两个方面评价了两种浸出溶剂对浸出膨化大豆料的影响。浸出效果方面,考察了浸出混合油质量分数、浸出湿粕静吸附率、浸出干粕残油率;浸出油品方面,考察了浸出毛油脂肪酸组成、酸值、色泽、微量组分以及残留溶剂,并与正己烷进行比较。结果表明:甲基戊烷各级浸出混合油质量分数相对较高,提油率高;甲基戊烷浸出湿粕静吸附率、浸出干粕残油率分别为(19.00±0.45)%和(0.57±0.08)%,正己烷浸出湿粕静吸附率、浸出干粕残油率分别为(20.65±0.20)%和(0.71±0.01)%;两种溶剂浸出毛油脂肪酸组成无差异,甲基戊烷浸出毛油酸值、总含磷量、残留溶剂含量、生育酚含量、甾醇含量均较低,而角鲨烯含量较高,具有精炼损失少、节能优势。研究表明新型溶剂甲基戊烷是替代正己烷作为浸出溶剂的良好选择。

With methylpentane and n - hexane as extraction solvents, from two aspects of extraction effect and extracted oil quality, the effects of two kinds of extraction solvents on four - stage eountercurrent ex- traction of oil from expanded soybean were evaluated. From the aspect of extraction effect, the mass frac- tion of extracted miscella, rate of static adsorption of the wet meal and residual oil rate of the leaching meal were studied. From the aspect of extracted oil quality, the fatty acid composition, acid value, color, trace component and residual solvent of the extracted crude oil were investigated and compared with that of n - hexane. The results showed that the mass fraction of each stage miscella of methylpentane was higher, indi- cating higher oil extraction rate. The rate of static adsorption of the wet meal and the residual oil rate of the leaching meal of methylpentane were （ 19.00± 0.45 ） % and （ 0.57 ± 0.08 ） % respectively, while for n-hexane, they were （20.65 ±0.20）% and （0.71 ±0.01）% respectively. There was no significant differ- ence in fatty acid compositions between the two extraction solvents. The oil extracted by methylpentane showed lower acid value, phospholipid content, residual solvent contem, tecophemls content and sterols content, while it had higher squalene content, which meant less refined loss and more energy ellcient for methylpen- tane extraction. It could be noted that methvlpentanes was the oromising alternative solvent of n -hexane.