反气相色谱法研究前沥青烯的表面性质

doi:10.11949/j.issn.0438-1157.20171472

化工学报 ›› 2018, Vol. 69 ›› Issue (6): 2621-2626.DOI: 10.11949/j.issn.0438-1157.20171472

反气相色谱法研究前沥青烯的表面性质

肖怀德^1,2, 王强^1,2

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

收稿日期:2017-11-05 修回日期:2018-02-08 出版日期:2018-06-05 发布日期:2018-06-05
通讯作者: 王强
基金资助:
国家自然科学基金项目（21566036，21366029）。

Determination of preasphaltene surface properties by inverse gas chromatography

XIAO Huaide^1,2, WANG Qiang^1,2

1. Center for Physical and Chemical Analysis, Xinjiang University, Urumqi 830046, Xinjiang, China;
2. Key Laboratory of Coal Cleaning Conversion and Chemical Engineering Process, Xinjiang Uyghur Autonomous Region, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, Xinjiang, China

Received:2017-11-05 Revised:2018-02-08 Online:2018-06-05 Published:2018-06-05
Supported by:
supported by the National Natural Science Foundation of China(21566036, 21366029).

摘要/Abstract

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DG^sp和极性吸附焓DH^sp。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K_a为0.91，碱常数K_b为2.98，K_b/K_a=3.27。由此可知，前沥青烯为两性偏碱性材料。

关键词: 反气相色谱, 表面, 吸附, 前沥青烯

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 DG^sp and the polar adsorption enthalpy DH^sp 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 K_a is equal to 0.91, the base constant K_b is equal to 2.98, and K_b/K_a 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.

Key words: inverse gas chromatography, surface, adsorption, preasphaltene

中图分类号:

TQ536

肖怀德, 王强. 反气相色谱法研究前沥青烯的表面性质[J]. 化工学报, 2018, 69(6): 2621-2626.

XIAO Huaide, WANG Qiang. Determination of preasphaltene surface properties by inverse gas chromatography[J]. CIESC Journal, 2018, 69(6): 2621-2626.

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反气相色谱法研究前沥青烯的表面性质

Determination of preasphaltene surface properties by inverse gas chromatography

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