煤炭直接液化反应机理研究进展  

Research progress of direct coal liquefaction reaction mechanism

作　　者：刘敏 史士东 曲思建 刘立麟 盛明 

机构地区：[1]煤炭科学技术研究院有限公司煤化工分院,北京100013 [2]国家能源煤炭高效利用与节能减排技术装备重点实验室,北京100013 [3]煤炭资源高效开采与洁净利用国家重点实验室,北京100013

出　　处：《洁净煤技术》2015年第4期49-54,共6页Clean Coal Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2011CB201303)

摘　　要：为探讨煤炭直接液化反应机理,论述了煤炭直接液化反应历程,分析了煤的浸润溶胀、煤的热解、供氢溶剂热解、H2溶解、H2活化、自由基之间的相互反应等过程。研究发现,在合适的温度范围内,煤热解10 min以内即接近自由基浓度的最大值,与煤热解自由基反应活性强弱分别为:煤热解提供的活性氢及小分子自由基>供氢溶剂提供活性氢>H2提供活性氢,并指出H2与煤热解自由基的反应程度是决定最终液化产物整体H/C原子比的重要因素。基于液化反应机理,提出进一步明确H2在不同催化剂作用下被活化与煤热解自由基反应的机理,降低反应温度、压力,开发高活性催化剂是下一步研究方向。The process of direct coal liquefaction was introduced in order to investigate the reaction mechanism theories. The processes of swelling,coal pyrolysis,hydrogen-donor solvent pyrolysis,H2 dissolution and activation,reaction among free radicals were analyzed. The results showed that,the free radicals concentration almost reached maximum when the pyrolysis time was shorter than 10 minutes during a suitable temperature range. The reaction activity of free radical from highest to lowest in sequence was from coal pyrolysis,hydrogen-donor solvent and H2. The reaction between H2 and free radical was the key factor of H / C ratio of liquefaction product. Based on the analysis of reaction mechanism,the reaction mechanism between H2 and free radical under different catalyst should be further clarified. Developing high active catalysts condition,lowering reaction temperature and pressure was a further research direction for coal direct liquefaction.

关 键 词：煤炭直接液化 反应机理 供氢溶剂 H2传质过程 

分 类 号：TQ530.2[化学工程—煤化学工程]