Zullaikah, Siti and Rahkadima, Yulia T. and Ju, Yi-Hsu (2017) A non-catalytic in situ process to produce biodiesel from a rice milling by-product using a subcritical water-methanol mixture. A non-catalytic in situ process to produce biodiesel from a rice milling by-product using a subcritical water-methanol mixture, 111 (1). pp. 764-770. ISSN 0960-1481
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Abstract
A non-catalytic method to produce biodiesel in situ from a rice milling by-product, i.e. rice bran, using
subcritical water-methanol mixture has been investigated. The method was found to be unaffected by
initial moisture and free fatty acids (FFA) contents in rice bran so that no pretreatment was required. The
yield and purity of biodiesel were higher under CO2 atmosphere than those under N atmosphere due
the ability of the gas to acidify water-methanol mixture. Oil extraction from the bran was identified as
the limiting step and complete oil extraction could be achieved in 3 h at 200oC, 4 MPa (under CO2 atmosphere) and 43.8 wt% methanol concentration. Consequently, the highest biodiesel yield was also
achieved at those operating conditions. The experimental data suggested that hydrolysis of rice bran oil
into FFA followed by methyl-esterification of FFA into biodiesel could be the preferred reaction path to
direct transesterification of oil. Subcritical water-methanol mixture was also able to break down complex
carbohydrates in rice bran into simple sugars soluble in aqueous phase so that it could be separated
easily from biodiesel.
| Item Type: | Article |
|---|---|
| Additional Information: | 621.43 Zul a |
| Uncontrolled Keywords: | Biodiesel Rice bran Subcritical water-methanol In situ process Non-catalytic process |
| Subjects: | T Technology > TP Chemical technology > TP156 Crystallization. Extraction (Chemistry). Fermentation. Distillation. Emulsions. |
| Divisions: | Faculty of Industrial Technology > Chemical Engineering |
| Depositing User: | Siti Zullaikah |
| Date Deposited: | 13 Dec 2017 02:37 |
| Last Modified: | 13 Dec 2017 02:37 |
| URI: | http://repository.its.ac.id/id/eprint/43926 |
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