Viscosity and fractal dimension of coal soluble constituents in solution

被引：14

作者：

Shui, HF ^{[1
]}

Zhou, H ^{[1
]}

机构：

[1] Anhui Univ Technol, Dept Chem Engn, Maanshan City 243002, Anhui, Peoples R China

来源：

FUEL PROCESSING TECHNOLOGY | 2004年 / 85卷 / 14期

关键词：

viscosity measurement; fractal dimension; aggregation; coal;

D O I：

10.1016/j.fuproc.2003.10.024

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The change of solution viscosity with time for one kind of coal solubles PI-1, which was obtained from the pyridine insoluble (PI) fractions of Upper Freeport (UF) coal extracts with carbon disulfide-N-methyl-2-pyrrolidinone (CS2/NMP) mixed solvent (1:1 by volume) by solvent treatment of PI in NMP with additive, tetrabutylammonium acetate (TBAA), was investigated in this study. The fractal dimensions of PI-1 aggregates in solutions were calculated from Pal-Rhodes equation. The results show that the fractal concept can be used to study the aggregation of coal molecules in solution. The aggregation of PI-1 in solution at low temperature is a reaction-limited aggregation (RLA) mechanism, and the fractal dimension of PI-1 aggregates decreases with the increase of temperature, suggesting that the aggregation kinetic process is faster for higher temperature. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：1529 / 1538

页数：10

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