文献类型：期刊文献

英文题名：Investigations on the hydrogenation behaviors and kinetics of heavy fraction from direct coal liquefaction process

作者：Chen, Haitao[1,2];Huang, Sheng[1,2];Tian, Jiaxing[1,2];Wu, Shiyong[1,2];Wu, Youqing[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Coal Liquificat Gasificat & Utilizat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Engn Res Ctr Resource Utilizat Carbon containing W, Minist Educ, Shanghai 200237, Peoples R China

年份：2026

卷号：425

外文期刊名：FUEL

收录：;EI(收录号：20261620528847);WOS:【SCI-EXPANDED(收录号:WOS:001744418700001)】；

基金：This work was supported by Coal-Major Project (2024ZD1700403) , National Natural Science Foundation of China (22578128 and 22378129) and National Key R &D Program of China (2022YFB4101300) .

语种：英文

外文关键词：Direct coal liquefaction; Heavy fraction; Hydrogenation behaviors; Kinetics

摘要：The hydrogenation behaviors and kinetics of heavy fraction obtained from the bottom of hot high-pressure separator of direct coal liquefaction (DCL) process were systematically investigated at temperatures of 445475 degrees C and times of 5-45 min. Besides, the effects of asphaltene (AS) and oily substances on conversion behaviors of tetrahydrofuran-insoluble substances (THFIS) separated from heavy fraction were analyzed. The results indicated that temperatures and times significantly effect the hydrogenation behaviors of heavy fraction. When the temperature was below 465 degrees C (445 degrees C and 455 degrees C), oil-water-gas yield increased gradually with the prolong of time, showing substantial increases within 20 min. At temperatures of 465 degrees C and 475 degrees C, the increase of oilwater-gas yield was primarily concentrated within the initial 10 min. The oil-water-gas yield reaches its maximum at 455 degrees C and 40 min, which is 37.41 wt% higher than that of heavy fraction. Furthermore, approximately 18.00 wt% of THFIS which separated from heavy fraction was found to be convertible to oil and water. However, about 40% of THFIS portion in heavy fraction can be hydrogenated. The presence of AS and n-hexane soluble fraction (HS) in heavy fraction is observed to enhance THFIS conversion. Kinetic analysis revealed that the activation energy for the conversion of AS to oil-water-gas was 98.28kJ/mol, and the activation energies of AS polycondensation to THFIS and hydrocracking of THFIS to AS were 144.20 kJ/mol and 133.17 kJ/mol. The hydrocracking of THFIS to oil-water-gas exhibited the highest activation energy of 156.37 kJ/mol. Recycling heavy fraction back to the liquefaction reactor was proposed as a potential strategy to significantly improve oil yield.