| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 210595 | Fuel Processing Technology | 2011 | 6 Pages |
In this study, the Transesterification Double Step Process (TDSP) for the production of biodiesel from vegetable oil was modified to yield a shorter reaction time and products with improved quality. TDSP consists in a two step transesterification procedure which starts with a basic catalysis, followed by an acidic catalysis. The process modifications included a reduction in the concentration of catalysts, a reduction in the reaction time of the first step and the direct mixing of methanol/acid solution, without cooling the system between the first and second step. A comparison between washed and unwashed biodiesel demonstrates that the final washing and drying procedure is necessary for satisfactory results. The products were analyzed by 1H-NMR and nineteen different biodiesel analyses specific for international quality certification. The modified procedure resulted in a high conversion index (97% for waste cooking oil and soybean oil and 98% for linseed oil) and high yield (87 ± 5% for waste cooking oil, 92 ± 3% for soybean and 93 ± 3% for linseed oil). The biodiesel produced by the modified TDSP met ASTM, EN ISO and ABNT standards before the addition of stabilizer.
►Transesterification Double Step Process optimization for processing of waste oils. ►The first step of TDSP is a basic catalysis, while the second is an acid one. ►Oil conversions to biodiesel up to 97%. ►Biodiesel free of soap, mono, di and triglycerides. ►High quality and purity biodiesel obtained from waste oil.
