Abstract
The synthesis of biodiesel targeted as SNI 04-7182-2006 standard has been done from kapuk randu seed, following two steps i.e. sokhlet extraction process of kapuk seed oil from kapuk seed using n-heksane as a solvent, and the production of biodiesel from kapuk seed oil by transesterification process using methanol and KOH as catalyst. Transesterificatin process was performed at temperature 50 oC with the variation of stirring duration as followed 50, 75, 100 and 125 minutes. The kapuk randu extraction resulted % kapuk randu seed oil, while the transestherification process resulted around 55 - 65%. The biodiesel product characteristics provided the density value of all biodiesel at stirring durations variation are suitable with SNI standard (850 – 890 kg/m3), the viscosity value of all biodiesel are higher than the range SNI value (2,3 – 6,0 cSt). While the flash point values are lesser than SNI standard (10160 - 11000 cal/g). Keywords: kapuk randu seed, transestherification, biodiesel
Highlights
The synthesis of biodiesel targeted as SNI
standard has been done from kapuk randu seed
Transesterificatin process was performed at temperature 50 oC with the variation
Summary
Proses transesterfikasi dilakukan dengan mereaksikan 80 gram ml minyak biji kapuk randu (yang telah dipanaskan hingga suhu 50 oC), dengan sodium metoksida (dibuat dengan mencampur 0,6 g KOH dengan g metanol). Proses transesterifikasi dilakukan pada suhu dan waktu yang sudah ditentukan. Campuran didiamkan selama 24 jam, kemudian dipisahkan antara biodiesel (di bagian atas) dan gliserol (di bagian bawah) menggunakan corong pisah. Hasil biodiesel kemudian dicuci berulang kali dengan akuades, hingga bebas sabun dan sisa dari gliserol. Biodiesel yang sudah dicuci kemudian dipanaskan dengan penangas listrik hingga 110oC selama 30 menit, hingga sisa air pencucian teruapkan. Prosedur transesterifikasi dilakukan dengan waktu pengadukan pada suhu 50 0C dengan variasi lama pengadukan selama 50 (BP), 75 (BQ), 100 (BR) dan 125 (BS) menit. Biodiesel yang dihasilkan kemudian di analisis karakteristiknya meliputi massa jenis, viskositas, titik tuang (Pour Point), titik kabut (Cloud Point), titik nyala (Flash Point), dan kalor pembakaran
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