煤炭转化2025，Vol.48Issue(3)：12-20,9.DOI:10.19726/j.cnki.ebcc.202503002
煤直接液化过程中循环溶剂自身反应对供氢的影响
Effect of recycle solvent self-reaction on hydrogen donation in direct coal liquefaction
摘要
Abstract
To understand the effect of the self-reaction of solvents on their hydrogen dona-tion ability during direct coal liquefaction(DCL),the effects of solvent cracking and dehydrogenation on liquefaction of Daliuta(DLT)coal and the involved catalytic effects of catalysts and semicoke on solvent dehydrogenation were investigated.The effects of solvent cracking and free-radical coupling on the hydrogen donation behavior of the involved solvent were studied using model compounds.The results show that the cracking and dehydrogenation of the solvent lead to a decrease in its hydrogen donation ability and even transform it into semicoke and gas,resulting in solvent loss and quality dete-rioration as well as hindering coal liquefaction.Fe catalyst,Mo catalyst,and semicoke generated during DCL can catalyze solvent dehydrogenation and produce H2 which has poor hydrogen donation ability,thus not conducive to coal liquefaction.The higher the catalytic hydrogenation activity,the higher the catalytic dehydrogenation activity in the absence of hydrogen.Further,the bridge bonds among aromatic rings,alkyl chains in the aromatic rings,and alkanes in the non-hydrogen-donating components of the solvent are easy to break,which results in solvent loss and quality deterioration.Meanwhile,the free radicals generated via bond breakage consume the hydrogen-donating compo-nents of the solvent,further decreasing the hydrogen donation ability of the solvent.The hydrogen-donating solvent can inhibit solvent decomposition and free-radical coupling to a certain extent,but they are also easily induced to crack by free radicals.关键词
煤直接液化/循环溶剂/裂解/供氢/脱氢Key words
direct coal liquefaction/recycle solvent/cracking/hydrogen donation/dehydro-genation分类
化学化工引用本文复制引用
刘沐鑫,颜艳艳,黄顺进,王习权,安亮,高山松,单贤根,张彦军,石磊..煤直接液化过程中循环溶剂自身反应对供氢的影响[J].煤炭转化,2025,48(3):12-20,9.基金项目
国家自然科学基金项目(21978003)、国家重点研发计划项目(2023YFB4103401)、安徽省优秀青年教师培育项目(YQZD2023082)和大学生创新创业训练计划项目(S202211305007). （21978003）
