3.5. Influence of reaction time and membrane pore size
Fig. 5 shows the biodiesel yield with different reaction times
under the condition of 75 C of reaction temperature, 0.27 g/mL
of catalyst amount and 4.1 mL/min of circulation velocity. It can
be seen from the figure that the biodiesel yield increases withthe increase of reaction time. And this increasing tendency slows
down with the increase of reaction time, since the oil concentration
decreases and the reaction rate slows down gradually. In addition,
the reaction obtains a biodiesel yield of 79.1% with a reaction
time of 3 h, which is in reasonable agreement with the value calculated
from the model (80%).
When ceramic membranes of different pore sizes are used in
the membrane reactor, it is found that all the membranes (pore
sizes: 0.05 0.8 lm) used in this study are suitable for membrane
reaction system for biodiesel production. This is in agreement with
the lower drop size limit and the research of Cao et al. (Cao et al.,
2007). In addition, the biodiesel yields are almost the same with
the same reaction time (3 h), which means the membrane pore size
does not have significant effect on biodiesel yield.
3.5. Influence of reaction time and membrane pore sizeFig. 5 shows the biodiesel yield with different reaction timesunder the condition of 75 C of reaction temperature, 0.27 g/mLof catalyst amount and 4.1 mL/min of circulation velocity. It canbe seen from the figure that the biodiesel yield increases withthe increase of reaction time. And this increasing tendency slowsdown with the increase of reaction time, since the oil concentrationdecreases and the reaction rate slows down gradually. In addition,the reaction obtains a biodiesel yield of 79.1% with a reactiontime of 3 h, which is in reasonable agreement with the value calculatedfrom the model (80%).When ceramic membranes of different pore sizes are used inthe membrane reactor, it is found that all the membranes (poresizes: 0.05 0.8 lm) used in this study are suitable for membranereaction system for biodiesel production. This is in agreement withthe lower drop size limit and the research of Cao et al. (Cao et al.,2007). In addition, the biodiesel yields are almost the same withthe same reaction time (3 h), which means the membrane pore sizedoes not have significant effect on biodiesel yield.
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