摘要
以棉籽油为原料,氧化铝载钌(Ru/Al O3)为催化剂,对亚油酸异构化制备共轭亚油酸进行了研究。采用GC-MS分析不同温度、搅拌速率、催化剂添加量条件下产物中主要成分含量。通过判断反应前后棉籽油甘三酯Sn-1,2,3位脂肪酸组成的变化,评价金属钌催化剂的选择异构化催化特性。试验表明,165℃下Ru/Al2O3用量为棉籽油质量的2.5%,搅拌速率800 r/min,N2环境,反应36 h条件下,亚油酸转化率可达87.78%,共轭亚油酸的选择性为57.17%,得到产物中共轭亚油酸含量为289.3 mg/g棉籽油。随反应时间延长,顺、反共轭亚油酸会向双反式共轭亚油酸转化,产物中的反式油酸含量有所增加,并且,Sn-1,3位的共轭亚油酸选择性异构化率高于Sn-2位。
Taking the cottonseed oil as raw material and the alumina supported ruthenium （Ru/A12 03 ） as catalyst, the isomerization of linoleic acid into conjugated linoleic acid was studied. The contents of main components in the products were analyzed by GC - MS under different temperature, stirring rate and catalyst adding amount. In particular, whether the ruthenium catalyst had selective isomerization properties by determining the fatty acid composition of the Sn - 1,2,3 position of the triglyceride of cottonseed oil before and after the reaction. Results showed that the conversion of linoleic acid was 87.78% ; the selectivity of conj N2, 165℃, 36 h,800 r/min; and the mass ratio of catalyst to ugated linoleic acid was 57.17% at the condition of cottonseed oil was 2.5%. The content of conjugated linoleic acid was 289.3 mg/g cottonseed oil in the end product. As the reaction was progressing, the product of c, t- conjugated linoleic acid will be transformed to double trans conjugated linoleic acid. Meanwhile , the product of trans oleic acid content increased, and the selective isomerization rate of Sn-2 was higher than that of Sn- 1,3.
出处
《中国粮油学报》
EI
CAS
CSCD
北大核心
2017年第11期70-75,共6页
Journal of the Chinese Cereals and Oils Association
基金
金龙鱼营养与安全研究基金(201608)
