文献类型：期刊文献

英文题名：Pyrolysis of Asphaltenes in Subcritical and Supercritical Water: Influence of H-Donation from Hydrocarbon Surroundings

作者：Liu, Qing-Kun[1];Xu, Yan[2];Tan, Xue-Cai[1];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]Yancheng Inst Technol, Sch Chem & Chem Engn, Yancheng 224051, Peoples R China

年份：2017

卷号：31

期号：4

起止页码：3620

外文期刊名：ENERGY & FUELS

收录：;EI(收录号：20172303741103);WOS:【SCI-EXPANDED(收录号:WOS:000400039800028)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 21376075 and No. 21676084).

语种：英文

外文关键词：Organic solvents - Free radical reactions - Activation energy - Pyrolysis - Condensation - Reaction kinetics

摘要：The pyrolysis of asphaltenes under hydrothermal environments covering the subcritical and supercritical regions of water was applied, and the influence of the presence of H-donors was surveyed by a reaction kinetics analysis based on the lumping approach. Under hydrothermal environments, the pyrolysis of asphaltenes consisting mainly of condensation to coke and decomposition to maltenes is significantly faster than that under a N-2 environment. The H-donors introduced, decalin or maltenes, may provide nonaromatic H atoms, capping the carbon radicals essential to pyrolysis. Accordingly, the apparent activation energies of the condensation and the decomposition of asphaltenes both increase to varying degrees. The pyrolysis of asphaltenes in the presence of a small quantity of decalin is seriously retarded in subcritical water but recovers rapidly in supercritical water owning to the promoted initiation efficiency at high temperature. Accompanied by a large amount of maltenes, the decomposition to maltenes involved in the original pyrolysis network of asphaltenes can be neglected.