| Investigating the Influence of Radical Interactions of Antioxidants on the Dispersion of Asphaltene Aggregations |
| کد مقاله : 1265-ICOC |
| نویسندگان |
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لقمان الباجی *1، بابک مختاری2، غزل نجفی چالشتری2، شیرین باقرسایی2 1دانشجوی دکترا، گروه شیمی، دانشکده علوم، دانشگاه شهید چمران اهواز، اهواز، ایران 2گروه شیمی، دانشکده علوم، دانشگاه شهید چمران اهواز، اهواز، ایران |
| چکیده مقاله |
| Asphaltene precipitation poses a critical challenge in petroleum production, transportation, and refining, leading to pipeline plugging, equipment fouling, and catalyst deactivation. This phenomenon, driven by the self-assembly and deposition of asphaltenes, increases operational costs [1]. Recent studies have shown that 10-20% of asphaltene molecules are radical in nature. These free radicals, along with interactions such as π–π and hydrogen bonds, affect asphaltene aggregation and deposition [2]. The employment of chemical inhibitors and dispersants has received widespread attention as one of the most effective strategies for controlling asphaltenes' instability [3]. In continuation of our studies on asphaltene deposition inhibitors, three aromatic antioxidants, tert-butylhydroquinone (TBHQ), butylated hydroxyanisole (BHA), and butylated hydroxytoluene (BHT), were evaluated for their ability to stabilize asphaltenes and prevent deposition [4]. The effectiveness of these additives was assessed using UV-Vis spectroscopy, dispersion index, and FT-IR spectroscopy. The results of UV-Vis spectroscopy showed that the stability of asphaltenes increased at different concentrations of three antioxidants compared to the sample without additives. The highest asphaltene dispersion index was achieved at a concentration of 4000 ppm for TBHQ and BHA, which were 61.82% and 57.37%, respectively. In contrast, the asphaltene dispersion index for 2000 ppm BHT was only 43.72%. Additionally, the observed changes in the peaks of the FT-IR spectrum of asphaltene, especially in the peaks of polar functional groups, confirm the interaction of antioxidants with the asphaltene structure. The mechanism of asphaltene stabilization by these antioxidants seems to involve π–π, hydrophobic interactions, hydrogen bonding, and radical interactions between the active hydrogen of the antioxidants and free radicals on the aromatic structure of asphaltene. |
| کلیدواژه ها |
| Asphaltene, Interactions, Radical, Antioxidants |
| وضعیت: پذیرفته شده |