文献类型：期刊文献

英文题名：Roles of decalin as hydrogen donor in visbreaking of heavy oil

作者：Lu, Hong-Jun[1];Yuan, Dong-Hao[1];Gao, Chang[2];Li, Bi-Cheng[2];Huang, Zi-Bin[1];Yang, Jing-Yi[1];Yuan, Pei-Qing[1,3]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Shihezi Univ, Sch Chem & Chem Engn, Shihezi 832003, Xinjiang, Peoples R China;[3]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2023

卷号：175

外文期刊名：JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS

收录：;EI(收录号：20233814734689);WOS:【SCI-EXPANDED(收录号:WOS:001078039700001)】；

基金：Acknowledgements The authors acknowledge the financial supports from National Nat-ural Science Foundation of China (22178113) and National Energy R&D Center of Petroleum Refining Technology (33600000-22-ZC0607-0017) .

语种：英文

外文关键词：Visbreaking; Heavy oil; Hydrogen donor; Decalin; Density functional theory

摘要：The effect of the timing of adding 1 wt% decalin as a hydrogen donor on heavy oil visbreaking was studied. Experiments show that either premixing decalin with heavy oil or adding decalin during the reaction accelerates the formation of light distillates and improves the efficiency of viscosity reduction. Premixing with heavy oil is an appropriate way to add decalin. After 10 min of reaction at 400 celcius, the viscosity reduction rate of the product reaches 90% and the asphaltene content of the product is 1.8 wt% lower than that of the raw heavy oil. Ac-cording to theoretical calculations, the active hydrogens of decalin preferentially saturate the aromatic C radicals that are critical for condensation. The equilibrium constant of the H-donation reaches the order of 105, while the activation energy of the reaction is only about 26 kJ/mol. The thermal cracking of decalin itself releases active and small-sized radicals, which accelerate visbreaking by participating in the dealkylation network of heavy oil molecules.