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(英文)

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

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。

Datong coal was pulverized to 0074?mm 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