用GC/MS分析研究大同原煤及氧化煤的甲醇/四氢呋喃萃取物

为了研究氧化对煤样萃取性能的影响，先将大同煤破碎到200目并在105 ℃干燥，然后在温和条件下用双氧水进行氧化。将原煤和氧化煤在超声辐射下用甲醇/四氢呋喃(THF)混合溶剂进行萃取，并用GC/MS进行分析测定。结果发现，在两种甲醇/THF配比下，氧化煤的萃取率均高于原煤；而且随着萃取剂中THF浓度的提高，萃取率增大；从GC/MS测定结果看，四种萃取物的组成各不相同，显示氧化和萃取剂中THF含量的变化均能改变萃取物的化学组成，但四种萃取物中检测出的化合物均以烃类为主。另外，煤粉通过与萃取物和溶剂形成胶体而悬浮于上层清夜中，因此，超声条件下对煤进行萃取时必须过滤。

GC/MS ANALYSIS OF DATONG RAW AND OXIDIZED COAL EXTRACT USING METHANOL/TETRAHYDROFURAN MIXED SOLVENT

Datong coal was pulverized to 0.074mm and dried at 105*#℃, then oxidized with hydrogen peroxide under mild condition. Both raw and oxidized coal were extracted with methanol/tetrahydrofuran (THF) mixed solvents under ultrasonic irradiation, then the extracts were analyzed by GC/MS so as to study the difference of extracting between raw and oxidized coal. The result indicates that the extraction yields of oxidized coal were higher than those of raw coal at the test conditions and the extraction yield increased with increasing THF concentration. The components of the four extracts were different from each other, indicating that chemical components of extracts can be changed by both oxidation and THF content in mixed solvent. But the compounds in all the four extracts were mainly hydrocarbons. In addition, coal particles were supernatant through formation of coal powder-extract-solvent colloid, therefore, filtration must be taken in coal extraction under ultrasonic irradiation.