In this stage, the experiment was to study the influence of catalyst concentration. Concentration of
H2SO4 was varied in range 0.1-1% (v/v). The results of these experiments is presented at Figure 4 & 5.
Maximum yield of oil was obtained at H2SO4 0.25% (v/v) with value 21.54% and the lowest at H2SO4
0.5% (v/v) with 13.21%. According to Ramadhas et al., [4] and Ketaren, [19], rubber seed contain 40-
50% of the oil. When compared with the results of this study were too small. This is because of the low
quality of rubber seed and it was likely that the oil contained therein was small. Rubber seed will quickly
rots if the skin already peeled, but this can be avoid with dry it quickly which make them to be more
durable and can be stored in a long time. As mentioned by Ramadhas., et al. [4] from physical appearance
the higher catalyst concentration, the darker also biodiesel produced. Therefore the addition of a suitable
catalyst concentration is important to the physical appearance of biodiesel.
Figure 4 is a graph on the effect of catalyst concentration (H2SO4) to density and kinematic viscosity of
biodiesel. The density of biodiesel was obtained the lowest value on H2SO4 0.25% (v/v) at 0.89 g/mL, and
the highest on H2SO4 0.5% (v/v) at 0.96 g/mL. The density of biodiesel according to SNI 04-7182-2006 is
0.85-0.90 g/mL. The density values obtained in this experiment were slightly different from biodiesel
standard. That because there were no washing and neutralization process to the biodiesel product so the
impurities were still present in the product. The product was the result of the extraction-reaction, so there
were still other products besides biodiesel such as resin. The biodiesel product that obtained with H2SO4
0.25% (v/v) is 0.89 g/mL which meets with biodiesel standard.
In this stage, the experiment was to study the influence of catalyst concentration. Concentration ofH2SO4 was varied in range 0.1-1% (v/v). The results of these experiments is presented at Figure 4 & 5.Maximum yield of oil was obtained at H2SO4 0.25% (v/v) with value 21.54% and the lowest at H2SO40.5% (v/v) with 13.21%. According to Ramadhas et al., [4] and Ketaren, [19], rubber seed contain 40-50% of the oil. When compared with the results of this study were too small. This is because of the lowquality of rubber seed and it was likely that the oil contained therein was small. Rubber seed will quicklyrots if the skin already peeled, but this can be avoid with dry it quickly which make them to be moredurable and can be stored in a long time. As mentioned by Ramadhas., et al. [4] from physical appearancethe higher catalyst concentration, the darker also biodiesel produced. Therefore the addition of a suitablecatalyst concentration is important to the physical appearance of biodiesel.Figure 4 is a graph on the effect of catalyst concentration (H2SO4) to density and kinematic viscosity ofbiodiesel. The density of biodiesel was obtained the lowest value on H2SO4 0.25% (v/v) at 0.89 g/mL, andthe highest on H2SO4 0.5% (v/v) at 0.96 g/mL. The density of biodiesel according to SNI 04-7182-2006 is0.85-0.90 g/mL. The density values obtained in this experiment were slightly different from biodieselstandard. That because there were no washing and neutralization process to the biodiesel product so the
impurities were still present in the product. The product was the result of the extraction-reaction, so there
were still other products besides biodiesel such as resin. The biodiesel product that obtained with H2SO4
0.25% (v/v) is 0.89 g/mL which meets with biodiesel standard.
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