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International Journal of Marine Science 2013, Vol.3, No.5, 33-35
http://ijms.sophiapublisher.com
35
(Figure 1). The conical flask containing solution was
shaken for 3 h by electric shaker at 300 rpm.
Figure 1 The reaction process of transesterification
2.2.7 Shetteling
After shaking the solution was kept for 16 h to settle the
biodiesel and sediment layers clearly.
2.2.8 Separation of biodiesel
The biodiesel was separated from sedimentation by
flask separator carefully. Quantity sediment (glycerin,
pigments, etc.) was measured.
2.2.9 Washing
Biodiesel was washed thoroughly by 6% water until it
was become clean.
2.2.10 Drying and storage
Biodiesel were kept in a dryer and production was
measured by using measuring cylinder. pH values
were evaluated and stored for analysis.
2.3 Density Measurement
Density is defined as a mass of an object divided by
its volume. ASTM standard D941 test method was
used to measure the density of the biodiesel fuel. The
measurements were done at 15
℃
by using Anton
Paar (DMA 35N). The measurement was conducted
five times for each sample and the final results were
the mean value. The measured densities and calculated
value for each algal biofuel were tabulated in Table 1.
2.4 Viscosity Measurement
Viscosity is defined as the resistance to follow of a
fluid. In order to measure the viscosities of the algal
biofuels ASTM Standard D445 test method was used.
The kinematic viscosity was determined at 40
℃
by
multiplying the constant of viscometer tube and the
measured efflux time, which is the time for a known
volume of liquid flowing under gravity to pass
through a calibrated glass capillary viscometer tube.
The measurements for viscosities were done five
times for each sample and the results were the mean
value.
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