Figure 3 shows the influence of catalyst type on ester
yields. As can be observed, the potassium catalysts
presented the best behavior. On the other hand, both
times the hydroxides gave rise to bigger percentages
than the corresponding methoxides. In consequence, the
potassium hydroxide was the best suited catalyst. These
results agree with those obtained by other authors. In
fact, Nye et al.,
23
in a process of transesterification of
used frying oil with different alcohols, and Tomasevic
and Siler-Marinkovic,
2
in a process of methanolysis of
used frying oil, also concluded that potassium hydroxide
was the best catalyst
Figure 3 shows the influence of catalyst type on esteryields. As can be observed, the potassium catalystspresented the best behavior. On the other hand, bothtimes the hydroxides gave rise to bigger percentagesthan the corresponding methoxides. In consequence, thepotassium hydroxide was the best suited catalyst. Theseresults agree with those obtained by other authors. Infact, Nye et al.,23in a process of transesterification ofused frying oil with different alcohols, and Tomasevicand Siler-Marinkovic,2in a process of methanolysis ofused frying oil, also concluded that potassium hydroxidewas the best catalyst
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