CAJ | 학술논문

本实验采用WK11模型化合物及ND褐煤和IL烟煤, 在含有吡啶的水、环己烷、甲苯双溶液系统中研究其吸附和溶胀行为.研究结果显示,在稀溶液条件下吡啶吸附量和溶胀率都很低,而且即使在很长的反应时间内溶液中的吡啶也不能被全部吸附.这表明虽然由于热力学有利的熵变,吡啶可以断开煤中所有的氢键交联结构而形成新的氢键,但溶剂环境的影响和孔径等因素的扩散限制,也显著影响煤的吡啶吸附量和溶胀行为.在低吡啶浓度时,煤的溶胀率与吸附量无线性关系.在高吡啶浓度时,溶胀率随吸附量的增大而增加.但吡啶浓度超过一定值时,由于吡啶的强抽提作用,一定反应时间后煤和溶剂界面消失.
본실험채용WK11모형화합물급ND갈매화IL연매, 재함유필정적수、배기완、갑분쌍용액계통중연구기흡부화용창행위.연구결과현시,재희용액조건하필정흡부량화용창솔도흔저,이차즉사재흔장적반응시간내용액중적필정야불능피전부흡부.저표명수연유우열역학유리적적변,필정가이단개매중소유적경건교련결구이형성신적경건,단용제배경적영향화공경등인소적확산한제,야현저영향매적필정흡부량화용창행위.재저필정농도시,매적용창솔여흡부량무선성관계.재고필정농도시,용창솔수흡부량적증대이증가.단필정농도초과일정치시,유우필정적강추제작용,일정반응시간후매화용제계면소실.
The pyridine adsorption and swelling b ehaviors of WK11 model compound, ND and IL coals in pyridine containing water, cyclohexane and toluene binary solvent mixtures were investigated. The results suggested that the pyridine adsorption amount and swelling ratio were very low when a small amount of pyridine existed in solutions. The small amount of pyrid ine could not be totally adsorbed by coal even after very long experiment time. Although pyridine could break all hydrogen bonds in coaldue to the more favora ble entropy change, other factors including environmental surrounding solvent, pore structure of absorbent and molecular diameter of absorbate could influence the adsorption behaviors greatly. The coal swelling ratio also did not have linear relationship with the uptake of pyridine in low concentration stage. At high pyridine concentration, the swelling ratio increased with the pyridine concentr ation. However, the boundary between coal particles and solvents would disappear when the pyridine concentration was high enough.