论文部分内容阅读
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。
In order to study the effect of oxidation on the extraction performance of coal samples, Datong coal was first crushed to 200 mesh and dried at 105 ℃, then oxidized with hydrogen peroxide under mild conditions. Raw coal and coal oxide were extracted under ultrasonic irradiation with a mixed solvent of methanol and tetrahydrofuran, and analyzed by GC MS. The results showed that the extraction rate of coal oxide was higher than that of coal in the presence of two kinds of methanol with THF, and the extraction rate increased with the increase of THF concentration. From the result of GC MS, The results show that the chemical composition of the extract changes with the changes of the contents of THF in the extractants and the extractants. However, all the compounds detected in the four extracts are dominated by hydrocarbons. In addition, pulverized coal is suspended in the supernatant by forming colloids with the extract and the solvent, so coal must be filtered under ultrasonic conditions.