Determination of preasphaltene surface properties by inverse gas chromatography

doi:10.11949/j.issn.0438-1157.20171472

Abstract

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

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

CLC Number:

TQ536

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

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.

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