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Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
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An Innovative Approach for Oxidative Desulfurization Advancement through High Shear Mixing: An Optimization Study on
Micah M Haboc1, Nathaniel P Dugos1, Angelo Earvin Sy Choi1
1Department of Chemical Engineering, De La Salle University, 2401 Taft Ave., Manila 0922, Philippines.
ACS Omega
|October 14, 2024
Summary
This study optimized mixing-assisted oxidative desulfurization (MAOD) to remove sulfur from alternative fuels. Sludge-derived Fe(VI) effectively reduced benzothiophene (BT) in pyrolysis oil to meet environmental standards.
Area of Science:
- Environmental Chemistry
- Chemical Engineering
- Materials Science
Background:
- Petroleum-based fuels have detrimental environmental effects.
- Pyrolysis oil from waste tires is a potential alternative fuel but contains high sulfur content, specifically benzothiophene (BT).
- Taiwan and the Philippines have strict sulfur limits for industrial fuels.
Purpose of the Study:
- To investigate and optimize the mixing-assisted oxidative desulfurization (MAOD) process for removing BT from a model fuel.
- To determine the optimal process conditions for MAOD using sludge-derived Fe(VI) as an oxidant.
- To evaluate the effectiveness of the optimized MAOD process on high-sulfur pyrolysis oil.
Main Methods:
- Oxidative desulfurization of BT in a model fuel using crude Fe(VI) oxidant.
- Response surface methodology with Box-Behnken design to study independent variables: mixing speed, phase transfer agent (PTA) amount, Fe(VI) concentration, and mixing temperature.
- Statistical analysis to identify significant variables and optimal conditions.
Main Results:
- Sulfur conversion increased with higher Fe(VI) concentrations and PTA amounts, and lower mixing speeds and temperatures.
- BT to BT sulfone conversions ranged from 17% to 64% in experimental runs.
- Optimal conditions yielded an 88% sulfur conversion in the model fuel and a 55% sulfur reduction in pyrolysis oil.
Conclusions:
- Sludge-derived Fe(VI) is effective for MAOD of BT in both model fuel and pyrolysis oil.
- The optimized MAOD process operates under mild conditions and meets the sulfur requirements for industrial heating oils in Taiwan and the Philippines.
- This study demonstrates a viable method for producing cleaner alternative fuels from waste tires.
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