Ultrasound-Assisted Oxidative Desulfurization of Diesel | ||
| Journal of Engineering | ||
| Article 1, Volume 22, Issue 11, November 2016, Pages 55-67 | ||
| Authors | ||
| Niran K. Ibrahim; Walla A. Noori; Jaffar M. Khasbag | ||
| Abstract | ||
| Due to the dramatic environmental impact of sulfur emissions associated with the exhaust of diesel engines, last environmental regulations for ultra-low-sulfur diesel require a very deep desulfurization (up to 15 ppm), which cannot be met by the conventional hydrodesulfurization units alone. The proposed method involves a batch ultrasound-assisted oxidative desulfurization (UAODS) of a previously hydrotreated diesel (containing 480 ppm sulfur) so as to convert the residual sulfur-bearing compounds into their corresponding highly polar oxides, which can be eliminated easily by extraction with a certain highly polar solvent. The oxidizing system utilized was H2O2 as an oxidant, CH3COOH as a promoter, with FeSO4 as a catalyst; whereas acetonitrile was used as extractant. The major influential parameters related to UAODS process have been investigated, namely: ratio of oxidant/fuel, ratio of the promoter/oxidant, dose of catalyst, reaction temperature, and intensity of ultrasonic waves. Kinetics of the reaction has been also studied; it was observed that the UAODS of diesel fuels fitted pseudo-first-order kinetics under the best experimental conditions, whereas values of the apparent rate constant and activation energy were 0.373 min-1 and 24 KJ/mol, respectively. The oxidation treatment, in combination with ultrasonic irradiation, revealed a synergistic effect for diesel desulfurization. The experimental results showed that sulfur removal efficiency could amount to 98% at mild operating conditions (70 ○C and 1 bar). This indicates that the process is efficient and promising for the production of ultra-low-sulfur diesel fuels. | ||
| Keywords | ||
| Ultra; low; sulfur diesel; Oxidative desulfurization; ultrasound | ||
|
Statistics Article View: 184 PDF Download: 61 |
||