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Study on the aggregation of coal liquefied preasphaltene in organic solvents by UV-vis and fluorescence spectrophotometry

机译:紫外可见荧光分光光度法研究煤液化前沥青质在有机溶剂中的聚集

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摘要

Aggregation of heavy products of coal liquefaction such as preasphaltene is one of important influencing factors on the coking properties of liquefaction technology. In this paper, the aggregation of coal-derived PA in tetrahydrofuran and N-methyl-2-pyrrolidinone has been investigated by gel chromatography, absorption and fluorescence spectroscopy. The results indicate that PA is a complex mixture with lower H/C (atomic ratio 0.61) and contains different chromophores and fluorophores. It shows strong propensity of aggregation and can form nanoaggregates even in the very dilute solution such as 6.25 mg/l. With the increasing of PA concentration, the concentration of aggregates increases but the dimension of aggregates is basically invariable. Although a flexion point of the fluorescence intensity integrated can be observed with increasing of PA concentration, it cannot present the concentration where any aggregation starts. It varies with the excitation wavelength.
机译:煤液化重产物如前沥青质的聚集是影响液化技术焦化性能的重要因素之一。本文通过凝胶色谱,吸收和荧光光谱研究了煤衍生的PA在四氢呋喃和N-甲基-2-吡咯烷酮中的聚集。结果表明,PA是具有较低H / C(原子比0.61)的复杂混合物,并且包含不同的发色团和荧光团。它显示出很强的聚集倾向,即使在非常稀的溶液(如6.25 mg / l)中也可以形成纳米聚集体。随着PA浓度的增加,骨料的浓度增加,但骨料的尺寸基本不变。尽管随着PA浓度的增加可以观察到积分的荧光强度的弯曲点,但是它不能呈现任何聚集开始的浓度。它随激发波长而变化。

著录项

  • 来源
    《Fuel》 |2011年第1期|p.305-311|共7页
  • 作者单位

    School of Chemistry and Chemical Engineering, Anhui Key Laboratory of Clean Coal Conversion and Utilization, Anhui University of Technology, 243002 Ma'anshan, China;

    School of Chemistry and Chemical Engineering, Anhui Key Laboratory of Clean Coal Conversion and Utilization, Anhui University of Technology, 243002 Ma'anshan, China;

    School of Chemistry and Chemical Engineering, Anhui Key Laboratory of Clean Coal Conversion and Utilization, Anhui University of Technology, 243002 Ma'anshan, China;

    School of Chemistry and Chemical Engineering, Anhui Key Laboratory of Clean Coal Conversion and Utilization, Anhui University of Technology, 243002 Ma'anshan, China;

    School of Chemistry and Chemical Engineering, Anhui Key Laboratory of Clean Coal Conversion and Utilization, Anhui University of Technology, 243002 Ma'anshan, China;

    School of Chemistry and Chemical Engineering, Anhui Key Laboratory of Clean Coal Conversion and Utilization, Anhui University of Technology, 243002 Ma'anshan, China;

    School of Chemistry and Chemical Engineering, Anhui Key Laboratory of Clean Coal Conversion and Utilization, Anhui University of Technology, 243002 Ma'anshan, China;

    School of Chemistry and Chemical Engineering, Anhui Key Laboratory of Clean Coal Conversion and Utilization, Anhui University of Technology, 243002 Ma'anshan, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    preasphaltene; fluorescence; absorbance; aggregation;

    机译:沥青质荧光吸光度聚合;

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