| In order to determine the availability of biodiesel raw materials, woody plant oil, waste cooking oil and acidified oil that could be used as biodiesel raw materials were taken as the research objects, and the unsaponifiable matter content and fatty acid composition and content were analyzed. The results showed that the content of unsaponifiable matter of seven woody plant oils such as palm oil was lower than 1.10%, and the content of fatty acid was higher than 91.50%. The fatty acid composition was mainly composed of three unsaturated fatty acids, oleic acid, linoleic acid and linolenic acid (except for palm oil). The content of unsaponifiable matter in the waste cooking oil changed greatly, the content of fatty acid was between 83.99% and 94.87%, and the fatty acid composition was mainly composed of linoleic acid and linolenic acid for most waste cooking oil. The fatty acid content of five acidified oils was between 71.35% and 92.05%, the proportion of saturated fatty acid in acidified coconut oil was 80.06%, and the fatty acid composition of the other four acidified oils was mainly unsaturated fatty acid. In conclusion, seven woody plant oils are excellent biodiesel raw materials, and the raw material quality indicators for the preparation of biodiesel from waste cooking oil and acidified oil should be strictly controlled. |
