Desulfurization of Saudi Arabian crudes by oxidation-extraction method
Raja L Al Otaibi1, Dong Liu2, Xulian Hou2
1Petrochemical Research Institute, King Abdulaziz City for Science and Technology, PO Box 6086, Riyadh, 11442 Kingdom of Saudi Arabia.
Applied Petrochemical Research
|September 23, 2016
Summary
Saudi Arabian crude oil was desulfurized using hydrogen peroxide and acetic acid. Dimethylformamide (DMF) as an extractant achieved 35.11% sulfur removal with 95% oil recovery.
Area of Science:
- Petroleum Chemistry
- Chemical Engineering
- Environmental Science
Background:
- Crude oil refining requires efficient sulfur removal to meet environmental standards.
- Saudi Arabian crude oil presents unique challenges for desulfurization due to its specific composition.
- Oxidation-extraction is a promising method for removing sulfur compounds from petroleum fractions.
Purpose of the Study:
- To investigate the oxidation-extraction desulfurization of Saudi Arabian crude oil.
- To optimize reaction conditions and identify the most effective extractant.
- To elucidate the desulfurization mechanism and analyze the impact on different oil fractions.
Main Methods:
- Utilized a hydrogen peroxide-acetic acid oxidation system.
- Screened various extractants, identifying Dimethylformamide (DMF) as optimal.
- Optimized parameters including temperature, molar ratios (peracetic acid to sulfur, acetic acid to hydrogen peroxide), and extractant-to-oil volume ratio.
Main Results:
- Achieved a 35.11% desulfurization rate and 95% oil recovery using DMF as the extractant under optimal conditions (70°C, specific molar and volume ratios).
- Desulfurization efficiency varied across fractions: gasoline-diesel > VGO > VR, attributed to sulfur compound structures.
- The process minimally affected oil quality, with sulfides primarily extracted by DMF.
Conclusions:
- The developed oxidation-extraction method with DMF is effective for desulfurizing Saudi Arabian crude oil.
- Optimization of reaction parameters significantly enhances desulfurization efficiency and oil recovery.
- Understanding sulfur compound behavior in different fractions is crucial for targeted desulfurization strategies.
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