KOH g1 which corresponds to FFA level of about 12.15%. FFA level of the feedstock was decreased below 1% FFA level in the laboratory scale experiments by one step pretreatment reaction. As seen in Table 1, the acid value of the fleshing oil used in this study was 24.7 mg KOH g1. The pretreatment reaction parameters determined in the laboratory experiments were used in pilot scale biodiesel production because the properties of the fleshing oil used in the laboratory experiments were very close to those of the fleshing oil used in this study. The pretreatment conditions for fleshing oil were 30:1 alcohol molar ratio and 10% sulfuric acid based on FFA level of the fleshing oil. In the calculations, the molecular weight of the FFA was calculated to be the average molecular weight of the fatty acids in the fleshing oil. The esterification process was repeated for two times for the fleshing oil. The ingredient amounts used in the pretreatment reactions for the fleshing oil were given in Table 3a.
The acid value of the fleshing oil was reduced from 24.7 to 1.9 mg KOH g 1 on average. This value is very close to the values obtained in the laboratory experiments. In the pretreatment process, there was oil loss about five percent of the fleshing oil during the alcohol-catalyst-water removing and drying process. In addition to acid value, some properties of the pretreated fleshing oil were characterized to understand the effects of pretreatment. The pretreatment results were given in Table 3b. The density of the fleshing oil and pretreated fleshing oil was measured at 25 C because they were in solid form at room temperature. The viscosity, density and water content of the fleshing oil reduced after the pretreatment reaction. The fuel properties of the pretreated oils were very close to each other. This situation shows the repeatability of the experiments. In this study, the sulfur content of fleshing oil was above 990 ppm which is the maximum measurement value of the sulfur analyzer. The reason of high sulfur content of the fleshing oil is the results of the industrial process of the solid wastes recycle plant where the fleshing oil was obtained. This means that sulfur content of the feedstock is important to get low sulfur content
KOH g1 which corresponds to FFA level of about 12.15%. FFA level of the feedstock was decreased below 1% FFA level in the laboratory scale experiments by one step pretreatment reaction. As seen in Table 1, the acid value of the fleshing oil used in this study was 24.7 mg KOH g1. The pretreatment reaction parameters determined in the laboratory experiments were used in pilot scale biodiesel production because the properties of the fleshing oil used in the laboratory experiments were very close to those of the fleshing oil used in this study. The pretreatment conditions for fleshing oil were 30:1 alcohol molar ratio and 10% sulfuric acid based on FFA level of the fleshing oil. In the calculations, the molecular weight of the FFA was calculated to be the average molecular weight of the fatty acids in the fleshing oil. The esterification process was repeated for two times for the fleshing oil. The ingredient amounts used in the pretreatment reactions for the fleshing oil were given in Table 3a.The acid value of the fleshing oil was reduced from 24.7 to 1.9 mg KOH g 1 on average. This value is very close to the values obtained in the laboratory experiments. In the pretreatment process, there was oil loss about five percent of the fleshing oil during the alcohol-catalyst-water removing and drying process. In addition to acid value, some properties of the pretreated fleshing oil were characterized to understand the effects of pretreatment. The pretreatment results were given in Table 3b. The density of the fleshing oil and pretreated fleshing oil was measured at 25 C because they were in solid form at room temperature. The viscosity, density and water content of the fleshing oil reduced after the pretreatment reaction. The fuel properties of the pretreated oils were very close to each other. This situation shows the repeatability of the experiments. In this study, the sulfur content of fleshing oil was above 990 ppm which is the maximum measurement value of the sulfur analyzer. The reason of high sulfur content of the fleshing oil is the results of the industrial process of the solid wastes recycle plant where the fleshing oil was obtained. This means that sulfur content of the feedstock is important to get low sulfur content
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