神华长焰煤大分子结构特征的研究

Preliminary study on macromolecular structure characteristics of Shenhua long flame coal

利用ASE 350型超声快速溶剂抽提仪,在高温高压下对神华长焰煤(SH)进行二硫化碳/N-甲基吡咯烷酮(CS2/NMP)混合溶剂抽提,抽提率约为25%(质量分数)。将得到的抽提残渣(SHC)进行钌离子催化氧化(RICO)降解反应,并对产物进行了离子色谱(IC)检测和以四甲基氢氧化铵(TMAH,25%甲醇溶液)为衍生化试剂的热辅助-在线甲酯化后的气质联用仪(GC-MS)检测分析。结果表明,神华长焰煤大分子结构中含有C2～28烷基侧链,C2～22的连接芳环的烷基桥链,有相对较多的醚键链接的芳环结构存在,芳环缩合程度相对较低(主要以含有2～4个苯环的共轭结构为主),有较多的醚键链接的芳环结构及羟基(-OH)、羰基(=C=O)和甲氧基(-OCH3)等形式含氧基团以及含硫和氮等杂原子化合物的存在。

By using ASE 350 （Accelerated Solvent Extraction） Shenhua long flame coal was extracted with mixed solvent of carbon disulfide/N-methyl pyrrolidone （CS2/NMP） under high temperature and high pressure, and the extraction rate was about 25 %. The extracted residue was degraded by ruthenium ion catalytic oxidation （RICO）, then the products were examined with IC and GC/MS, which depends on thermal auxiliary-methyl esterification of tetramethyl ammonium hydroxide （ TMAH, 25 % methanol solution）. The results show that the macromolecular structure of Shenhua coal contains alkyl side chains at a length of C2 _ 28 and alkyl bridge between aromatic rings at a length of C2 _ 22. The aromatic condensation level is relatively low （most are conjugated structure of 2 -4 benzene rings）. And there are many ether linked aromatic structures, oxygen groups like hydroxyl （ -OH ）, carbonyl （ C -- O ）, methoxy （ -OCH3 ）, and heteroatom compounds with sulfur and nitrogen.