Due to the unsaturated components (such as methyl oleate, linoleic acid methyl ester, etc.)in crude biodiesel product , should try to shorten the heating time during distillation and control the lower distillation temperature, to prevent the heat polymerization reaction, affect the yield and quality of products.
So we can use vacuum distillation instead of normal distillation to get the biodiesel under the normal pressure.For example, under the pressure of 0.665 kPa collection range of 160-220 ℃ fraction, under the pressure of 2 kPa collected between 230-310 ℃ fraction. Than ordinary distillation, vacuum distillation operation temperature is reduced, shorter time for heating the raw material, but the temperature is also too high, operating time is a bit long, in the process of distillation glycerin molecules tend to be carried away.
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