Karakteristik Metil Ester Minyak Jarak Pagar Hasil Proses Transesterifikasi Satu dan Dua Tahap

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dc.contributor Balai Besar Penelitian dan Pengembangan Pascapanen Pertanian Jl. Tentara Pelajar No.12A Bogor 16114. en-US
dc.creator Sumangat, Djajeng
dc.creator Hidayat, Tatang
dc.date 2019-01-16
dc.date.accessioned 2019-10-09T09:43:39Z
dc.date.available 2019-10-09T09:43:39Z
dc.identifier http://ejurnal.litbang.pertanian.go.id/index.php/jpasca/article/view/9907
dc.identifier 10.21082/jpasca.v5n2.2008.18-26
dc.identifier.uri http://124.81.126.59/handle/123456789/7984
dc.description Biodiesel (metil ester)  umumnya dihasilkan dari proses transesterifikasi minyak nabati antara lain dari minyak jarak pagar.   Proses transesterifikasi dengan pereaksi metanol dan katalis basa (KOH) dapat dilakukan satu  atau dua tahap pada berbagai variabel suhu reaksi dan nisbah molar metanol dengan minyak. Penelitian ini bertujuan membandingkan  karakteristik físiko-kimia (viskositas, densitas dan bilangan asam) serta persentase  ester asam lemak dari metil ester yang dihasilkan. Digunakan rancangan acak lengkap faktorial dengan tiga variabel perlakuan yaitu (A) tahap transesterifikasi (A1= satu tahap, A2= dua tahap), (B) suhu reaksi (B1= 30oC, B2= 65oC) dan (C) nisbah molar metanol-minyak (C1=3:1, C2=4:1, C3=5:1 dan C4=6:1), serta dua kali ulangan.  Hasil penelitian menunjukkan bahwa  proses transesterifikasi satu tahap pada suhu 30°C dengan nisbah molar metanol- minyak  5:1 menghasilkan karakteristik metil ester terbaik  yaitu viskositas kinematik 3,89 cSt, densitas 0,88g/cm3  dan bilangan asam 0,48 mg KOH/g sampel. Tidak terdapat perbedaan jenis senyawa ester asam lemak pada metil ester hasil transesterifikasi satu dan dua tahap yaitu berturut-turut metil oleat (47,09-47,46%), metil linoleat (32,20-32,53%), metil palmitat (18,65-18,93) dan metil lignoserat (0,26-0,30%). Jumlah  persentase senyawa ester asam lemak yang  menunjukkan persentase konversi trigliserida menjadi metil ester pada proses satu tahap adalah  100%, sedangkan pada proses dua tahap adalah  99,62%.  Rendemen (yield) metil ester  pada proses satu tahap adalah 77,99%,   lebih tinggi dibandingkan proses dua tahap yaitu 70,80%. Berdasarkan karakteristik dan rendemen metil ester, proses satu tahap lebih baik dibandingkan dua tahap. The Characteristics of Methyl Esther of Jatropha Oil Obtained From One and Two Steps Transesterification Process Biodiesel (methyl esther) is made mainly through transesterification process of vegetable oil such as jatropha oil and generally uses methanol as reagent and KOH as catalyst. There are one-step and two-steps process using variables of reaction temperature and molar ratio of methanol to oil.This experiment aimed comparing physico-chemical characteristic (viscosity, density and acid number) as well as percentage of fatty acid esters of methyl esters as its pararnaters of these two type process. Factorial completely randomized design with two replication was used as experiment design with three variables treatments, namely (A) transesterification steps: (A1) one step, (A2) two steps; (B) reaction temperatues: (Bl) 30°C, (B2) 65°C; and (C) molar ratio of methanol to oil: (CI=3:1, C2=4:1, C3=5:1 dan C4=6:1). it was concluded that the best treatment was one step process at 30°C using molar ratio methanol: oil 5:1. The characteristics of methyl ester were viscosity 3.89 cSt, density 0.88 g/cm3 and acid number 0,48 mg KOH/g sample. The fatty-acids esters of methyl esters of both processes was the same i.e. methyl oleic (47.09-47.46%), methyl linoleic (32.20-32.53%), methyl palmitic (18.65-18.93%) and methyl lignoseric (0.28-0.30%). Total percentage of fatty acid esters in methyl ester of one step process was 100% while that of two steps process was 99.62%. This total percentages could ·indicated as conversion degree of triglyceride into methyl ester. Yields of methyl ester from one-step process was 77.99% which was higher than that of two-steps process (70.80%). In terms of its characteristics and yield of methyl ester, one-step process was better than two-steps process. en-US
dc.format application/pdf
dc.language eng
dc.publisher Balai Besar Penelitian dan Pengembangan Pascapanen Pertanian en-US
dc.relation http://ejurnal.litbang.pertanian.go.id/index.php/jpasca/article/view/9907/8263
dc.rights Copyright (c) 2019 Jurnal Penelitian Pascapanen Pertanian en-US
dc.rights http://creativecommons.org/licenses/by-sa/4.0 en-US
dc.source Jurnal Penelitian Pascapanen Pertanian; Vol 5, No 2 (2008): Jurnal Penelitian Pascapanen Pertanian; 18-26 en-US
dc.source 2541-4054
dc.source 0216-1192
dc.subject biodiesel; Jatropha curcas L; metil ester; minyak jarak pagar; transesterifikasi; jatropha oil; methyl ester; transesterification. en-US
dc.title Karakteristik Metil Ester Minyak Jarak Pagar Hasil Proses Transesterifikasi Satu dan Dua Tahap en-US
dc.type info:eu-repo/semantics/article
dc.type info:eu-repo/semantics/publishedVersion
dc.type Peer-reviewed Article en-US


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