Abstract
Biodiesel fuel (BDF) is expected to be an alternative resource for fossil fuel which could solve global warming and petroleum resource conservation problems. We proposed a dry process which has no need for washing water or waste water treatment as opposed to the conventional wet process. In the bubble strip system, gas is supplied by a gas pump propels gas through crude BDF in a gas bubbler, then the exit gas containing methanol (MeOH) vapor passes through a condenser and the MeOH is collected in a vessel. It is a closed system in which MeOH-free gas from the condenser returns to the inlet of the gas pump. In this study, we evaluated a large-scale bubble stripping unit compared with a small one to be put to practical use for purification of crude biodiesel. As a result, both units met requirements mandated by Japanese Industrial Standards for residual methanol concentration in BDF.
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