溶剂抽提对兖州煤高温快速液化反应性的影响

EFFECT OF SOLVENT EXTRACTING ON THE QUICK LIQUEFACTION PERFORMANCE OF YANZHOU COAL AT HIGH TEMPERATURE

以四氢呋喃为抽提溶剂,利用索氏提取器对兖州煤进行了抽提处理.对原煤与所得到的抽余煤进行了扫描电镜、N2吸附-脱附、热重和红外分析并进行了高温快速液化实验.通过与原煤的对比,考察了溶剂索氏抽提对煤的结构和液化反应性的影响.结果表明:抽余煤结构和热解行为均发生了明显改变;与原煤相比较,其高温快速液化的转化率有明显提高;低分子化合物对无外在活性氢来源的煤高温快速液化明显起到提供氢源的作用.

In this paper,Yanzhou coal is extracted in a soxhlet extractor with tetrahydrofuran（THF） as extracting solvent. Both the raw coal and the THF extracted coal are analyzed by SEM,BET, TG and IR spectrum. Experiments on quick coal liquefaction at high temperature （QCLHT） of raw coal and its THF extracted coal are carried out. The effect of soxhlet extraction of solvent on the structure and liquefaction performance of the extracted coal is investigated by the comparison with raw coal. The results show that both the structure and pyrolysis behavior of the residual coal are changed; the conversion rate of QCLHT of the residual coal is higher than that of raw coal; low molecular compounds can play a role of hydrogen donor in the QCLHT reaction without external active hydrogen resource.