Determination of preasphaltene surface properties by inverse gas chromatography

XIAO Huaide; WANG Qiang

doi:10.11949/j.issn.0438-1157.20171472

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Determination of preasphaltene surface properties by inverse gas chromatography

更新时间：2025-12-10

- Determination of preasphaltene surface properties by inverse gas chromatography
- CIESC Journal Issue 6, Pages: 2621-2626(2018)
- 作者机构：
  
  1. 新疆大学理化测试中心,新疆,乌鲁木齐,830046
  2. 新疆大学化学化工学院, 煤炭清洁转化与化工过程自治区重点实验室,新疆,乌鲁木齐,830046
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20171472
  CLC： Q536
- Online First：05 June 2018，
  
  Published：05 June 2018
- 稿件说明：
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XIAO Huaide, WANG Qiang. Determination of preasphaltene surface properties by inverse gas chromatography[J]. CIESC Journal, 2018, (6): 2621-2626.
DOI：

XIAO Huaide, WANG Qiang. Determination of preasphaltene surface properties by inverse gas chromatography[J]. CIESC Journal, 2018, (6): 2621-2626. DOI： 10.11949/j.issn.0438-1157.20171472.

摘要

采用反气相色谱法表征前沥青烯的表面性质，测定了其表面色散自由能及酸碱常数，并基于极性探针的吸附，得到极性探针在前沥青烯表面的极性吸附自由能DGsp和极性吸附焓DHsp。结果显示，温度在60～100℃范围内，前沥青烯的表面色散自由能随着温度的升高而逐渐减小。前沥青烯表面的酸常数Ka为0.91，碱常数Kb为2.98，Kb/Ka=3.27。由此可知，前沥青烯为两性偏碱性材料。

Abstract

The surface properties of the preasphaltene were characterized by inverse gas chromatography

surface dispersion free energy and acid-base constant. The polar adsorption free energy DGsp and the polar adsorption enthalpy DHsp of the polar probe on the surface of the preasphaltene were obtained by the adsorption of polar probes. The results show that the surface free energy of the preasphaltene decreases with the increase of the temperature at the temperature of 60-100℃. The acid constant Ka is equal to 0.91

the base constant Kb is equal to 2.98

and Kb/Ka is equal to 3.27. It can be seen that the surface of the preasphaltene is amphoteric

and the alkaline effect is stronger than acid effect.

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