| 초록 |
This study has focused on the investigation of physical and chemical properties of asphaltenes and to improve the stability and reactivity in the hydrocracking or thermal cracking conditions. In particular, H-donor solvent like tetralin has been adopted as an additive solvent. DFT results revealed that tetralin plays an important role in providing hydrogen radicals to hydrogenate asphaltene or prevent coke formation via radical removal. The asphaltene conversion tests were conducted in an autocaleve batch reactor at various reaction conditions, i.e. asphaltene content : 0~100%, reaction temperature: 643~673K, initial pressure: 12.0~20.0MPa N2 or H2 and run time : 0~6h. The asphaltene conversion was confirmed by CHNS-analysis, C-7 solvent extraction, TGA, and GC-FID/MS analysis. In thermal cracking of asphaltene in the presence of 50% tetralin, asphaltene was converted by 49.0%, in contrast to the conversion, 27.8%, in the absence of tetralin. Moreover, the catalytic hydrocracking condition with tetralin in feed led to a further increased conversion of asphaltene, close to 70%. |
