文献类型：期刊文献

英文题名：Visbreaking of Heavy Oil under Supercritical Water Environment

作者：Liu, Jun[1];Xing, Yu[2];Chen, Yi-Xiao[2];Yuan, Pei-Qing[1];Cheng, Zhen-Min[1];Yuan, Wei-Kang[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China

年份：2018

卷号：57

期号：3

起止页码：867

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20180504695970);WOS:【SCI-EXPANDED(收录号:WOS:000423496400008)】；

基金：This work was supported by the National Natural Science Foundation of China (Grants 21376075 and 21676084).

语种：英文

外文关键词：Heavy oil production - Reaction kinetics - Condensation

摘要：The visbreaking of heavy oil under high-pressure N-2 or supercritical water (SCW) environment was experimentally investigated: Despite the difference in the reaction media, the visbreaking 'follows the same mechanism, that is, dealkylation and condensation of aromatics. The presence of SCW makes it possible that the visbreaking of heavy oil is transferred to the SCW phase with superior diffusivity by which the visbreaking tends to be controlled by intrinsic reaction kinetics rather than by diffusion. Accordingly, dealkylation occurring in the SCW phase, which is vital to the viscosity reduction of heavy oil, responds sensitively to the increase in reaction temperature. Being the secondary reaction of dealkylation at moderate temperatures, condensation is effectively suppressed with reduced reaction time required for dealkylation. By the introduction of SCW and the adoption of an appropriate reaction temperature, the visbreaking efficiency could be drastically improved together with guaranteed stability of visbreaking products.