碱性介质中白音华褐煤电化学氧化的研究  

Study on electrochemical oxidation of Baiyinhua lignite in alkaline medium

作　　者：冯晴晴 何德民[1] 范玉强 张秋民[1] 关珺[1] Feng Qingqing;He Demin;Fan Yuqiang;Zhang Qiumin;Guan Jun(School of Chemical Engineering,Dalian University of Technology,Dalian Liaoning 116024,China)

机构地区：[1]大连理工大学化工学院,辽宁大连116024

出　　处：《煤化工》2024年第6期71-78,共8页Coal Chemical Industry

摘　　要：深入研究电化学氧化过程中煤颗粒的氧化,有助于诠释煤颗粒在电化学环境下解离反应的一般规律,进而有针对性地控制反应进程。以白音华褐煤为研究对象,采用三电极体系的H型隔膜电解反应器,在碱性条件下进行电化学氧化实验,考察电极类型、氧化温度、阳极电位对褐煤氧化过程的影响,并对氧化过程进行分析。结果表明:褐煤电化学氧化过程中,镍电极具有较高的响应电流且有利于褐煤中的亲水性官能团在溶液体系中均匀分散,电化学氧化温度的升高有利于增加分子间的碰撞频率和能量,阳极电位的升高有利于提高反应中间体的形成和转化速率;从微观角度分析,电化学氧化过程中煤颗粒内部桥键和侧链断裂,简单的芳香族结构进入溶液中形成腐植酸,大部分脂肪族结构保留在残煤中,腐植酸与煤颗粒共同争夺溶液中的·OH,以实现进一步氧化。Further study on the oxidation of coal particles in the electrochemical oxidation process was helpful to interpret the general law of the dissociation reaction of coal particles in the electrochemical environment,and then could control the reaction process accordingly.Taking Baiyinhua lignite as the research object,a three-electrode H-type diaphragm electrolytic reactor was used to conduct electrochemical oxidation experiment under the alkaline condition.The effects of electrode type,oxidation temperature and anodic potential on the oxidation process of lignite were investigated,and the oxidation process was analyzed.The results showed that during the electrochemical oxidation of lignite,the Ni electrode had higher response current and was conducive to the uniform dispersion of hydrophilic functional groups in the solution system,the increase of electrochemical oxidation temperature was conducive to the increase of intermolecular collision frequency and energy,and the increase of anodic potential was conducive to the formation and conversion rate of reaction intermediates.From a microscopic point of view,the internal bridge bonds and side chains of coal particles were broken during the electrochemical oxidation process,and simple aromatic structures entered the solution to form humic acid,while most aliphatic structures remained in the residual coal,and humic acid and coal particles competed for·OH in the solution for further oxidation.

关 键 词：褐煤 碱性介质 电化学氧化 电极 温度 阳极电位 

分 类 号：TQ536[化学工程—煤化学工程]