不同煤岩成分萃取后的表面张力变化  

Variations in Surface Tension of Extracted Coals with Different Lithotypes

作　　者：余坤坤 张小东[1,2] 李贵中 李贤忠[1] YU Kunkun;ZHANG Xiaodong;LI Guizhong;LI Xianzhong(School of Energy Science and Engineering,He’nan Polytechnic University,454000 Jiaozuo,China;Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region,454000 Jiaozuo,China;Petrochina Research Institute of Petroleum Exploration and Development,065007 Langfang,China)

机构地区：[1]河南理工大学能源科学与工程学院 [2]中原经济区煤层(页岩)气协同创新中心,河南焦作454000 [3]中国石油勘探开发研究院

出　　处：《煤炭转化》2018年第5期1-6,共6页Coal Conversion

基　　金：国家自然科学基金资助项目(41372162)

摘　　要：选取平顶山焦煤和霍尔辛赫贫煤作为研究对象,分别用四氢呋喃(THF)、二硫化碳(CS_2)、丙酮、醋酸(HAc)和正己烷等有机溶剂对煤样进行索氏萃取,借助于索氏萃取仪和接触角测量仪,对溶剂萃取前后煤样的萃取率、煤-水接触角及表面张力进行测试计算分析.结果表明:镜煤的萃取率最高,其次是亮煤和暗煤,相同的煤岩成分,用THF和CS_2作为溶剂的萃取率最大,用HAc和正己烷作为溶剂的萃取率较小,相比而言,焦煤萃取率显著大于贫煤萃取率;暗煤的煤-水接触角最大,其次为亮煤,镜煤的煤-水接触角最小,而表面张力呈现相反的对应关系;萃取后,不同煤岩成分的煤-水接触角的对应关系并没有明显的变化;THF和CS_2作为溶剂萃余物的接触角和表面张力的改变最为明显,而HAc和正己烷作为溶剂对煤表面的亲水基团萃取效果较弱,接触角与表面张力变化不显著.To investigate the change laws of the superficiality and the wettability of the extracted coal in different lithotypes,the coking coal samples were taken from the Pingdingshan coal fields and the meagre coal were taken from Huoerxinhe coalmine,and the extraction solution of tetrahydrofuran(THF),carbon disulfide(CS2),acetone,acetic acid(HAc)and n-hexane were experimentally conducted on the samples.Extraction rates and coal-water contact angels were measured,and further the surface tension was calculated by soxhlet extraction and contact angle meter.The results show that extraction yield of organic solvents on the vitrain is the highest,followed by the clarain,the durain,among different lithotypes.Further,the extraction yields of THF and CS2 are the highest,however the extraction yields of HAc and n-hexane are relatively low.The extraction yield of coking coal is significantly higher than meagre coal.The coal-water contact angle of the durain is the most largest,followed by the clarain,the coal-water contact angle of vitrain is the smallest,whereas,the surface tension exhibits the opposite correspondence,and the coal-water contact angle of the extracted coal in different lithotypes has no obvious change.In comparison,The coal-water contact angle and the surface tension can be changed most significantly by CS2 and THF,while HAc and n-hexane have weaker extraction effect on hydrophilic groups on coal surface,resulting in no significantly change in contact angle and surface tension.

关 键 词：煤岩成分 溶剂萃取 接触角 表面张力 润湿性 

分 类 号：TQ530[化学工程—煤化学工程]