摘要
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。
The pyridine adsorption and swelling behaviors 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 pyridine could not be totally adsorbed by coal even after very long experiment time Although pyridine could break all hydrogen bonds in coal due to the more favorable 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 concentration However, the boundary between coal particles and solvents would disappear when the pyridine concentration was high enough
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2003年第1期6-11,共6页
Journal of Fuel Chemistry and Technology
基金
日本学术振兴会 (JSPS)"Researchforthefuture"项目
国家自然科学基金 ( 2 993 60 90
2 990 60 12 )。~~
