Oxidation of petroleum sulphides with nitrogen dioxide |
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| Affiliation: | 1. Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia;2. Department of Chemistry, Ahmadu Bello University, Zaria, Nigeria;3. Institute of Contaminant Management, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia;4. Department of Chemistry, Al-Qalam University Katsina, Tafawa Balewa Way, Katsina, Nigeria;5. Department of Chemistry, Wayne State University, United States |
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| Abstract: | - 1.1. Petroleum sulphides (obtained as concentrates from appropriate distillates) were oxidized with a mixture of air and nitrogen dioxide to sulphoxides, with yields of 75 to 80% for sulphoxide sulphur, but the process was complicated by secondary processes: the formation of up to 30% of nitrosulphoxides of variable structure; sulphones and carbonyl compounds were present as traces. The target product was separated from most impurities by an alkaline wash, followed by chromatography.
- 2.2. Oxidation of individual sulphides under the conditions adopted gave sulphoxides, which contained only traces of compounds with a nitro-group, easily removed by recrystallization or elution chromatography.
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