Abdala, Reza Azim (2026) Optimasi Karbon Aktif Kulit Biji Kopi Robusta (Coffea Canephora L.) Sebagai Adsorben Pemurnian Crude Biodiesel Minyak Jelantah Berdasarkan SNI 7182:2015. Undergraduate thesis, Politeknik Negeri Jember.
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Abstract
This study aimed to optimize the purification process of crude biodiesel derived from waste cooking oil using activated carbon prepared from robusta coffee husk (Coffea canephora L.) as an adsorbent through the dry washing method. The activated carbon was produced through carbonization followed by chemical activation using 2 M hydrochloric acid (HCl). It was subsequently applied with variations in adsorbent particle size (40, 60, and 80 mesh), adsorbent concentration (2%, 3.5%, and 5% w/v), and purification temperature (55°C, 60°C, and 65°C). Process optimization was carried out using the Response Surface Methodology (RSM) with a Box-Behnken Design (BBD). The results showed that adsorbent particle size had a significant effect on biodiesel yield (p-value = 0.0089), while the interaction between particle size and adsorbent concentration also had a significant effect (p-value = 0.0348). The optimum conditions were obtained at an adsorbent particle size of 78.8971 mesh, an adsorbent concentration of 2.18395% (w/v), and a purification temperature of 59.2099°C, resulting in a predicted biodiesel yield of 75.3263% with a desirability value of 1.000. Under the optimum conditions, the purified biodiesel exhibited a density of 867.5 kg/m³, an acid value of 0.531 mg KOH/g, a water content of 0.012%, and a sediment content of 0.03%, all of which complied with the quality requirements specified in SNI 7182:2015. However, the fatty acid methyl ester (FAME) content (33%) did not meet the required standard. These findings indicate that activated carbon derived from robusta coffee husk has the potential to serve as an alternative adsorbent for biodiesel purification by improving several biodiesel quality characteristics based on SNI 7182:2015.
| Item Type: | Thesis (Undergraduate) | ||||||
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| Uncontrolled Keywords: | Adsorben, Biodiesel, Dry Washing, Karbon Aktif Kulit Biji Kopi Robusta, Minyak Jelantah, Optimasi, Response Surface Methodology (RSM). | ||||||
| Subjects: | 410 - Rumpun Ilmu Teknik > 430 - Ilmu Keteknikan Industri > 432 - Teknik Produksi (dan Atau Manufakturing) 410 - Rumpun Ilmu Teknik > 430 - Ilmu Keteknikan Industri > 433 - Teknik Kimia 410 - Rumpun Ilmu Teknik > 430 - Ilmu Keteknikan Industri > 435 - Teknik Industri 410 - Rumpun Ilmu Teknik > 430 - Ilmu Keteknikan Industri > 439 - Bioteknologi Dalam Industri 410 - Rumpun Ilmu Teknik > 430 - Ilmu Keteknikan Industri > 443 - Teknik Enerji |
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| Divisions: | Jurusan Teknik > Prodi D4 Teknik Energi Terbarukan > Tugas Akhir | ||||||
| Depositing User: | Reza Azim Abdala | ||||||
| Date Deposited: | 14 Jul 2026 06:38 | ||||||
| Last Modified: | 14 Jul 2026 06:39 | ||||||
| URI: | https://sipora.polije.ac.id/id/eprint/57918 |
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