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酸洗脱灰及离子交换对低阶煤热溶剂提质分离的影响

李显,  朱贤青,  肖黎,  芦田隆一,  三浦孝一,  罗光前,  姚洪

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文章导航 > 燃料化学学报（中英文）  > 2014 >  42(08): 897-904
李显, 朱贤青, 肖黎, 芦田隆一, 三浦孝一, 罗光前, 姚洪. 酸洗脱灰及离子交换对低阶煤热溶剂提质分离的影响[J]. 燃料化学学报（中英文）, 2014, 42(08): 897-904.
引用本文: 李显, 朱贤青, 肖黎, 芦田隆一, 三浦孝一, 罗光前, 姚洪. 酸洗脱灰及离子交换对低阶煤热溶剂提质分离的影响[J]. 燃料化学学报（中英文）, 2014, 42(08): 897-904.
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LI Xian, ZHU Xian-qing, XIAO Li, RYUICHI Ashida, KOUICHI Miura, LUO Guang-qian, YAO Hong. Degradative solvent extraction of demineralized and ion-exchanged low-rank coals[J]. Journal of Fuel Chemistry and Technology, 2014, 42(08): 897-904.
Citation: LI Xian, ZHU Xian-qing, XIAO Li, RYUICHI Ashida, KOUICHI Miura, LUO Guang-qian, YAO Hong. Degradative solvent extraction of demineralized and ion-exchanged low-rank coals[J]. Journal of Fuel Chemistry and Technology, 2014, 42(08): 897-904.
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酸洗脱灰及离子交换对低阶煤热溶剂提质分离的影响

  • 1.

    华中科技大学 煤燃烧国家重点实验室, 湖北 武汉 430074;

  • 2.

    京都大学 化工学院, 日本 京都 615-8510;

  • 3.

    京都大学 先进能源研究所, 日本 京都 615-8510

基金项目: 华中科技大学自主创新研究基金（2013TS077）。
详细信息
    通讯作者:

    李显（1980- ），男，副教授，从事低阶碳源（低阶煤、生物质及城市垃圾等）的热转化及利用，Tel：027-87542417，E-mail：xian_li@hust.edu.cn。

  • 中图分类号: TK01+9

Degradative solvent extraction of demineralized and ion-exchanged low-rank coals

  • 1.

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;

  • 2.

    School of Chemical Engineering, Kyoto University, Kyoto 615-8510, Japan;

  • 3.

    Institute of Advanced Energy, Kyoto University, Kyoto 615-8510, Japan

    摘要
  • 摘要: 采用酸洗脱灰、酸洗和Na/Co离子交换对两种低阶煤（MM和LY）进行预处理，然后以1-甲基萘为溶剂对预处理煤进行热溶剂提质萃取，把煤分成提质煤（UC）、高分子量萃取物（deposit）和低分子量萃取物（soluble）3种主要固体组分，以及少量水和气体产物。结果表明，通过脱灰和离子交换均提高了两种萃取物的收率及碳含量，并明显促进了煤中含氧官能团的脱除。脱灰后MM煤的高分子量萃取物收率从3.5%增加到9.5%，Na离子交换LY的低分子量萃取物的碳含量高达85.3%、氧含量低于6.4%。离子交换对两种萃取物的物理化学性质有明显的影响，Na+的影响尤为显著。酸洗脱灰和离子交换对低阶煤热溶剂提质萃取有明显促进作用。
    Abstract: Dehydration and upgrading are essential pretreatment methods for efficient utilization of low-rank coal. In previous works the authors employed degradative solvent extraction method to dehydrate and upgrade low-rank coals and fractionate them into several fractions. For further study of this method, two low-rank coals (MM and LY) were pretreated by acid washing for demineralization or acid washing and Na/Co ion-exchange. The pretreated and raw coals were then extracted by 1-methylnaphthalene (1-MN) at 350 ℃ and fractionated into upgraded coal (UC), high molecular weight extract (Deposit), low molecular weight extract (soluble), as well as a little H2O and gas products. The results show that both acid washing and ion-exchange enhance the yields and carbon contents of the two extracts. Ion-exchange obviously promotes the removal of oxygen-containing functional group during extraction. The yield of high molecular weight extract of demineralized MM increases from 3.5% to 9.5%, and the carbon content and oxygen content of low molecular weight extract of Na ion-exchanged LY are as high as 85.3% and less than 6.4%, respectively. Ion-exchange has a distinct influence on physical and chemical properties of the extracts. The influence of Na ion-exchange is especially remarkable. Thus, demineralization and ion-exchange have evident promotion for the degradative solvent extraction of low-rank coal.
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出版历程
  • 收稿日期:  2014-01-20
  • 修回日期:  2014-05-05
  • 刊出日期:  2014-08-30

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