Pengaruh Jenis Asam, Jenis Ragi dan Lama Fermentasi terhadap Hasil Bioetanol dari Ampas Tebu sebagai Bahan Bakar Campuran Mesin Sepeda Motor

Larasati, Jati Alam Raima (2019) Pengaruh Jenis Asam, Jenis Ragi dan Lama Fermentasi terhadap Hasil Bioetanol dari Ampas Tebu sebagai Bahan Bakar Campuran Mesin Sepeda Motor. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penggunaan bahan bakar campuran bensin-etanol diketahui dapat menurukan konsumsi bahan bakar dan mengurangi emisi gas buangan pada mesin sepeda motor (Rifal dan Rauf, 2018) (Utomo dkk., 2014). Berdasarkan hal tersebut maka dilakukan penelitian dengan tujuan untuk mengetahui pengaruh jenis asam, jenis ragi daln lama fermentasi terhadap hasil bioethanol ampas tebu sebagai bahan bakar campuran mesin sepeda motor. Pada penelitian skala lab digunakan perlakuan hidrolisis dengan jenis asam sulfat dan asam klorida, 3 variasi lama fermentasi yaitu 6, 8, 10 hari dan menggunakan jenis ragi roti dan ragi tape. Kombinasi perlakuan dengan kadar etanol terbaik digunakan dalam produksi skala besar sehingga hasil bioetanol dapat digunakan dalam pengujian properties dan unjuk kerja mesin sepeda motor.
Hasil penelitian menujukkan bahwa pada skala lab rata – rata kadar etanol tertinggi sebesar 7,7% didapatkan yaitu dari kombinasi perlakuan jenis asam sulfat, jenis ragi roti, dan lama fermentasi 8 hari. Pada skala besar ampas tebu sebanyak 5,7 Kg ampas tebu kering yang telah dihidrolisis menghasilkan kadar gula 8 Brix. Lalu menggunakan larutan hasil fermentasi sebanyak 19 liter berkadar etanol 8% menghasilkan bioetanol sebanyak 811 ml dengan kadar 95% dengan destilasi bertingkat sebanyak 2 kali. Hasil uji properties bioethanol E50 berupa nilai Specific Gravity 0,816 ,densitas 816 Kg/m3 , viskositas kinematik 0.81 cSt, flash point 29oC. Hasil uji unjuk mesin diketahui mesin dengan perlakuan bioetanol lebih efisien dalam test konsumsi bahan bakar spesifik, dan lebih rendah emisi CO yang dihasilkan.
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The use of gasoline-ethanol mixture is known to reduce fuel consumption and reduce exhaust gas emissions on motorcycle engines (Rifal and Rauf, 2018) (Utomo et al., 2014). Based on this, the research was conducted with the aim to determine the effect of the type of acid, the type of yeast in the old fermentation on the results of bagasse bioethanol as a mixture of motorcycle fuel. In a lab-scale study hydrolysis was used with sulfuric and hydrochloric acid types, 3 long fermentation variations namely 6, 8, 10 days and using types of bread yeast and tape yeast. The best combination of treatment with ethanol content is used in large-scale production so that the results of bioethanol can be used in testing properties and performance of motorcycle engines.
The results showed that on the lab scale the highest average ethanol content was 7.7%, which was obtained from a combination of sulfuric acid treatment, bread yeast, and 8 days fermentation. On a large scale sugarcane bagasse of 5.7 kg of dried bagasse which has been hydrolyzed produces 8 Brix sugar content. Then using a fermented solution of 19 liters of 8% ethanol yields 811 ml of bioethanol with 95% content with 2 times the distillation. The test results of E50 bioethanol properties are Specific Gravity 0.816, density 816 Kg / m3, kinematic viscosity 0.81 cSt, flash point 29oC. The results of the engine test show that bioethanol treatment machines are more efficient in testing specific fuel consumption, and lower CO emissions are produced.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Bioetanol, Jenis Asam, Jenis Ragi, Lama Fermentasi, Uji Unjuk Kerja Mesin
Subjects:	Q Science > QH Biology > QH301 Biology
Divisions:	Faculty of Natural Science > Biology > 46201-(S1) Undergraduate Thesis
Depositing User:	Larasati Jati Alam Raima
Date Deposited:	20 Jul 2026 08:52
Last Modified:	20 Jul 2026 08:52
URI:	http://repository.its.ac.id/id/eprint/69917

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