摘要
以甲苯为溶剂在半连续装置上对神府、抚顺和大同三种年轻烟煤进行了超临界萃取研究。结果表明：提高系统压力或溶剂流量均可使萃取物生成速率和萃取率提高。通过对萃取结果和热重分析的比较，可以认为煤的超临界萃取实质上是一种在超临界流体保护下的煤热解，而且在这一过程中自由基碎片从煤到流体的扩散是速度控制步骤。对所得数据进行了动力学处理，认为这三种煤的萃取过程均可按温度区间分两段用二级反应来描述。
The supercritical extraction of Shenfu, Fushun and Datong coals is investigated on a semi- continuous apparatus. It is shown that both pressure and solvent flowrate have positive effects on extract formation. From the results of extraction and thermogravimetric analyses of coals, it can be concluded that supercritical extraction of coal is a pyrolysis process under the protection of supercritical fluids, and diffusion of radical fragments from coal matrix to the fluids is the speed-controlling step in the process under the conditions investigated. According to the kinetics treatment, the extraction can be represented as a global second order reaction in two temperature ranges with dividing line in the vicinity of 350℃
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
1992年第5期520-525,共6页
Journal of Dalian University of Technology
关键词
萃取
动力学分析
超临界
烟煤
extraction
kinetic analysis
supercritical fluid
coal chemical industry
bituminous coal
