Behavior of Asphaltenes in Crude Oil at High-Pressure CO2 Conditions: In Situ Attenuated Total Reflection–Fourier Transform Infrared Spectroscopic Imaging Study

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• 作者：Anton A. Gabrienko ; Oleg N. Martyanov ; Sergei G. Kazarian
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：June 16, 2016
• 年：2016
• 卷：30
• 期：6
• 页码：4750-4757
• 全文大小：487K
• 年卷期：0
• ISSN：1520-5029

文摘

An attenuated total reflection–Fourier transform infrared (ATR–FTIR) spectroscopic imaging approach has been used in situ to study CO₂-induced precipitation of asphaltenes from crude oil on a molecular level. The behavior of model and real oils subjected to high-pressure CO₂ has been monitored, and precipitation has been detected. The precipitated species have been chemically analyzed in situ at high-pressure conditions. It has been observed that only asphaltenes with oxygen-containing functional groups that are capable of specific Lewis acid–base interactions with CO₂ precipitated from crude oil at such conditions. It is supposed that CO₂ is able to interact with precipitated asphaltenes. On the basis of the obtained spectroscopic data, the mechanism of CO₂-induced precipitation of asphaltenes has been proposed.