Petroleum Chemistry ( IF 1.3 ) Pub Date : 2022-03-11 , DOI: 10.1134/s0965544122060123 D. V. Milordov 1 , G. R. Abilova 1 , N. A. Mironov 1 , E. G. Tazeeva 1 , S. G. Yakubova 1 , M. R. Yakubov 1
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Abstract
High-vanadium heavy oil asphaltenes were fractionated by a sequential precipitation method. Using FT-IR spectroscopy, elemental analysis, and optical spectroscopy, the differences in the compositions of the asphaltene fractions were thoroughly investigated. To isolate and purify vanadyl porphyrins (VPs) from the asphaltenes, extraction with N,N-dimethylformamide (DMF) followed by two-step column chromatography on silica gel and sulfocationite was employed. The effects of VPs on the solubility of the asphaltene fractions were evaluated based on optical density variations in the solvent/precipitant system in a kinetic mode. It was found that, in most cases, adding petroleum VPs to toluene solutions of asphaltene fractions decreases the solubility of these fractions. The highest effect of VPs on the solubility of the asphaltene fractions was observed for samples with a high concentration of polar heteroatom groups and low aromaticity.
中文翻译：
添加石油钒基卟啉对沥青质馏分溶解度的比较分析
摘要
采用连续沉淀法对高钒重油沥青质进行分馏。使用 FT-IR 光谱、元素分析和光学光谱，彻底研究了沥青质馏分组成的差异。为了从沥青质中分离和纯化氧钒 (VPs)，用N、N萃取使用-二甲基甲酰胺(DMF)，然后在硅胶和硫酸盐上进行两步柱色谱。VPs 对沥青质馏分溶解度的影响基于溶剂/沉淀剂系统中的光密度变化以动力学模式进行评估。发现在大多数情况下，将石油 VPs 添加到沥青质馏分的甲苯溶液中会降低这些馏分的溶解度。对于具有高浓度极性杂原子基团和低芳香性的样品，观察到 VPs 对沥青质馏分溶解度的影响最大。
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