| 초록 |
In conventional biodiesel production, biodiesel is mainly produced in alkali-catalyst condition. However, in this method, there are many disadvantages such as generation of undesired saponified product, problem of water contents, and difficulty of glycerin purification. So, catalyst-free supercritical methanol process are attractive method to overcome such problem. Because supercritical process is carried out in high temperature and high pressure, thermal stability and fuel properties of fatty acid methyl ester(FAME) in extreme condition are important aspect in biodiesel production. In addition, due to variety of the biodiesel source, it is important to investigate tendency on how the various fatty acid profiles of the different sources can influence biodiesel fuel properties. To investigate thermal stability and properties of biodiesel according to degree of unsaturation of vegetable oil, we synthesized 5 vegetable oils with supercritical methanol. The selected 5 vegetable oils were palm oil, rapeseed oil, soybean oil, safflower oil, and flaxseed oil which have different fatty acid composition each other. We can obtain the results that FAMEs derived from different oils have distinct properties unlike others. |
