Asphaltenes: Separations, structural analysis and applications
2019年7月1日 · Asphaltenes, complex aromatic compounds from various carbonaceous sources, could be obtained by solvent dissolution, filtration and adsorption. It was difficult to clarify the molecular structures and chemical properties of asphaltene due to its structural similarity, composition complexity and source dependences.
Asphaltene - Wikipedia
Asphaltenes consist primarily of carbon, hydrogen, nitrogen, oxygen, and sulfur, as well as trace amounts of vanadium and nickel. The C:H ratio is approximately 1:1.2, depending on the asphaltene source. Asphaltenes are defined operationally as the n- heptane (C. 3)-soluble component of a carbonaceous material such as crude oil, bitumen, or coal.
Asphaltenes and maltenes in crude oil and bitumen: A …
2024年7月15日 · Asphaltenes and maltenes, integral components of petroleum systems, wield profound influence over the properties of crude oils and derived products. This literature review reports their multifaceted behavior, shedding light on structural features, reactivity, contribution to material characteristics and methods for separation.
Molecular Size and Structure of Asphaltenes from Various Sources
2000年3月23日 · Fluorescence depolarization measurements are used to determine the size of asphaltene molecules and of model compounds for comparison. Mean molecular weights of roughly 750 amu with a range of roughly 500−1000 amu are found for petroleum asphaltenes.
Essential role of structure, architecture, and intermolecular ...
2022年12月1日 · Critical look at the technical and economic problems of asphaltene in the oil industry and a thorough study of the important issues of asphaltene, including molecular weight, chemical structure, molecular architecture, and aspects of intermolecular interaction, discussed.
Molecular structure characterization of asphaltene in the …
This work examined the detailed molecular structure of asphaltene in the presence of NEs, and proposed a mechanism of modification structure and stabilizing asphaltene.
Critical review of asphaltene properties and factors impacting its ...
2019年12月5日 · This research presents a review of asphaltene in crude oil and the factors that have the strongest impact on asphaltene stability in crude oil. The different models attempting to describe the asphaltene structure were explained, and the most recent and widely accepted model, Yen–Mullins, was described.
Structure–Dynamic Function Relations of Asphaltenes
2021年8月17日 · Asphaltene molecular and nanocolloidal structures have largely been resolved enabling development of structure–function relations of asphaltenes. Atomic force microscopy (AFM) and scanning tunneling microscopy (STM) have provided the first direct molecular structures of many asphaltenes with extension into broader distributions of petroleum ...
Deciphering structure and aggregation in asphaltenes: hypothesis-driven ...
2021年7月6日 · To understand asphaltene characteristics and reactivity, the field has turned to synthetic model compounds that mirror asphaltene structure, aggregation behavior, and thermal chemistry, including the nucleation of coke.
For exploration and processing of petroleum resource, understanding asphaltene structure and its deposition is critically important. The research on asphaltene covers several dimensions. Figure 1 illustrates a hierarchy structure from molecule to deposit phase in oil production.