Study on microwave-assisted extraction of coal

The effect of different factors on coal extraction yield-temperature, solvent, coal type and irradiation time were investigated for different China coals under microwave-assisted extraction（MAE）. The results show that the optimum temperature for ethanol, acetone and THF are 393,373 and 373 K respectively and the extraction yield of THF is higher than that of other two solvents under MAE. Extraction with several single organic solvents were conducted for the 5 typical China coals-Shenfu, Tongchuan, Panzhihua, Yitai and Huating coal under microwave-assisted extraction and Soxhlet extraction. Results indicat that extraction yield of ethylenediamine, ethanol, acetone, tetrahydrofuran under MAE are all higher than that of Soxhlet extraction and MAE required less time. Tongchuan coal extracts of ethanol and acetone which were extracted by MAE and Soxhlet extraction were analyzed by GC/MS.     

微波辅助抽提煤的实验研究

在微波辅助下,以四氢呋喃、乙醇和乙酸为溶剂抽提神府煤,考察了抽提温度、抽提时间、溶剂用量及煤粒度对抽提率的影响;同时探讨了上述三种溶剂对不同变质程度的攀枝花煤、铜川煤、神府煤、华亭煤和依泰煤在微波辅助下的抽提效果.结果表明,抽提率在一定的抽提温度、时间、溶剂用量及煤粒度下均有最佳值;变质程度相似的煤在相同抽提条件下抽提率不同.运用红外光谱现代分析技术,对神府脱灰煤和其抽提残煤的结构特征进行了对比分析,结果表明,抽提并没有破坏煤的大分子结构;利用GC/MS测定了铜川煤的乙醇微波辅助抽提物的组成.     

微波辅助萃取煤的实验研究

在微波辅助下,以神府煤为主要研究对象,四氢呋喃、丙酮、甲醇为溶剂,考察了萃取温度、时间、溶剂量及煤粒度对萃取率的影响,结果显示:使上述3种沸点接近的不同溶剂萃取率达到最佳值,所需要的萃取温度、溶剂量及煤粒度相差大;同时探讨了以四氢呋喃、丙酮、N,N-二甲基甲酰胺为溶剂,对不同变质程度煤的微波辅助萃取效果,结果是变质程度相似的煤在相同萃取条件下萃取率不同。运用红外光谱现代分析技术,对神府脱灰煤和四氢呋喃抽提残煤的结构进行对比分析,结果表明萃取并没有破坏煤的大分子结构。     

电导法测煤焦油盐含量的方法研究

煤焦油脱盐在煤焦油加氢制燃料油的工艺中至关重要,脱盐效果直接影响到催化剂失活。目前关于测煤焦油盐含量的方法并未成熟。本方法将煤焦油处理后进行离心分离,再测其电导率,方法简单,分析时间短,可以及时、有效地指导生产。