文献类型：期刊文献

英文题名：Continuous visbreaking of heavy oil in medium and high-pressure steam environments

作者：Xi, Yu-Feng[1];Shao, Zhi-Cai[2];Sun, Yun-Fei[1];Teng, Wei[3];Yang, Jing-Yi[1];Huang, Zi-Bin[1];Gong, Jian-Hong[2];Yuan, Pei-Qing[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]SINOPEC Res Inst Petr Proc, Beijing 100083, Peoples R China;[3]Shihezi Univ, Sch Chem & Chem Engn, Shihezi 832003, Xinjiang, Peoples R China

年份：2024

卷号：179

外文期刊名：JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS

收录：;EI(收录号：20241315812023);WOS:【SCI-EXPANDED(收录号:WOS:001220568000001)】；

基金：The authors acknowledge the supports from NSFC (Grant No. 22178113) and SINOPEC (Grant No. 120011; 33600000-22-ZC0607- 0017) .

语种：英文

外文关键词：Visbreaking; Heavy oil; Pressurized steam; Lumped reaction kinetic model; Diffusion

摘要：Continuous visbreaking of heavy oil in a tubular reactor was studied under pressurized steam environments at 10 MPa (MPS) and 18 MPa (HPS). Within the operating range considered, heavy oil and pressurized steam exhibit a liquid -vapor two-phase structure. During the transition from the MPS environment to the HPS environment, the dissolution of water into the oil phase is promoted, thereby reducing the viscosity of the oil phase. According to the lumped reaction kinetics analysis, the reaction behavior of the lumped component VR2 with a boiling point higher than 700 degrees C determines the visbreaking efficiency in the early visbreaking stage to a large extent. Dealkylation of VR2 and condensation of the lightest lumped component show sensitive responses to improved diffusion in the oil phase. At 400 degrees C and a space time of 37 min, visbreaking in HPS environment can achieve a viscosity reduction rate of 90%. Meanwhile, the asphaltene content of the product is lower than the feedstock value.