Extraction and Thermal Dissolution of Low-Rank Coal by N-Methyl-2-Pyrrolidinone
Extraction and Thermal Dissolution of Low-Rank Coal by N-Methyl-2-Pyrrolidinone
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DOI：
10.1007/978-3-319-72362-4_55
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发表时间：
2018-03
期刊：
影响因子：
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通讯作者：
Jun Zhao;H. Zuo;Si-yang Long;Jing-song Wang;Q. Xue
中科院分区：
文献类型：
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作者：
Jun Zhao;H. Zuo;Si-yang Long;Jing-song Wang;Q. Xue
为了有效利用低阶煤，采用N-2-甲基-2-吡咯烷酮(NMP)在高温高压下从4种低阶煤中提取热溶煤(TDC)。通过元素分析、红外光谱对热溶煤和残渣的结构进行了表征。分别研究了温度、煤阶、料液比和萃取时间对TDC萃取率的影响。此外，还提出了温和条件下TDC的萃取机理。结果表明，四种原煤的TDC的灰分含量均显着低于原煤，挥发份含量和H/C显着改善。对于KL煤来说，随着温度的升高，350℃时KL-TDC的萃取率明显提高，从33.75%提高到56.25%，灰分含量从0.57%降低到0.49%。
In order to effectively use of low rank coal, the thermally dissolve coal (TDC) was extracted from four kinds of low-rank coals by N-2-methyl-2-purrolidinone(NMP) at high temperature and high pressure. The structures of thermally dissolve coal and residues were characterized by element analysis, FT-IR spectra. The effects of temperatures, coal rank, solid-liquid ratio and extraction time on the extraction yields of TDC were studied, respectively. Moreover, the extraction mechanism of TDC at mild conditions is proposed. The results show that the ash contents of TDCs from four raw coals are significantly lower than that of raw coals, and the volatile contents and H/C are significantly improved. For KL coal, with the increase of temperature, the extraction yield of KL-TDC is improved evidently from 33.75% to 56.25% and the ash content is decreased from 0.57% to 0.49% at 350 °C.