Abstract: Under the condition of tubular mixer, a continuous process for biodiesel synthesis with butanone as co-solvent was studied in this paper. According to the experimental data and the inherent parameters of equipment, the relationship for the reaction time and feeding flux with conversion rate were deduced. Without any changes made to the equipment, the most effective approach for a more satisfactory conversion rate is to improve solubility and extend of reaction time. The actual relationship between conversion rate and the time is:Y=99.5-157.83591×EXP (-0.60508×(t/8)). It provides a theoretical basis for production, also facilitates the operation process, and reduces the blindness of operation.

Key words: methyl ester, biodiesel, continuous, tubular mixer