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Chemical Structure| 85652-50-2 Chemical Structure| 85652-50-2

Structure of Violanthrone-79
CAS No.: 85652-50-2

Chemical Structure| 85652-50-2

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Pagán Pagán, Nataira M ; Marciel, Amanda B ;

Abstract: Soluble asphaltene nanoaggregate clusters near the onset point of precipitation have been shown to stabilize water-in-oil (W/O) emulsions resulting in flow assurance problems in the oil and gas industry. Broadly, it has been shown that factors including size, shape, and heterogeneity of model colloidal particles influence the stability of W/O emulsions. However, the size and structure of soluble asphaltene nanoaggregate clusters across the full range of solvent quality are unknown. Here, we study the influence of solvent quality on the size and structure of soluble asphaltene nanoaggregate clusters and the model asphaltene molecule VO-79 using small-angle X-ray scattering (SAXS). We observe that the radius of gyration Rg of soluble asphaltene nanoaggregate clusters is independent of solvent quality until the onset point of precipitation where it then decreases with decreasing solvent quality. Soluble asphaltene nanoaggregate clusters self-associate to form mass fractals with an approximate fractal dimension of 2, Df ≈ 2. Interestingly, VO-79 does not show any evidence of nanoaggregate formation under all conditions tested. Lastly, we show that the interfacial tension (IFT) at the oil−water interface is initially dependent on solvent quality. The transport of soluble asphaltene nanoaggregate clusters from the bulk to the interface may be described as a diffusion-controlled process that is dependent on solvent quality. After aging, however, the IFT becomes independent of solvent quality, suggesting that emulsion stability depends on other factors beyond IFT, including the rheological properties of asphaltenes, their colloidal stability, and reorganization at the oil−water interface.

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Pagán Pagán, Nataira M ; Marciel, Amanda B ;

Abstract: Asphaltenes strongly adsorb to oil/water interfaces, forming viscoelastic films that confer solid-like mechanical properties and stabilize crude oil emulsions. It has been suggested that asphaltenes form the most stable crude oil emulsions close to their onset point of precipitation, where mixtures of soluble and insoluble asphaltenes are present in solution. Given their heterogeneity in chemical composition, molecular weight, and aggregation state, it remains challenging to identify the mechanisms that promote emulsion stability. In this study, we use the oscillating pendant drop method to investigate the dilatational rheological response of soluble asphaltene nanoaggregate clusters and the asphaltene model molecule violanthrone-79 (VO-79) as a function of solvent quality and aging time. We observe that the apparent complex dilatational modulus of soluble asphaltene nanoaggregate clusters is dependent on solvent quality and increases with aging time. We show that the apparent interfacial elastic modulus increases with aging time, whereas the apparent interfacial viscous modulus is independent of both solvent quality and aging time. These results support the long-standing hypothesis that insoluble asphaltenes hinder adsorption of soluble asphaltenes resulting in a decrease in elasticity. In contrast, VO-79 exhibits a relatively low apparent complex dilatational modulus that is independent of time and solvent quality. Lastly, we find that formation of an interfacial film that wrinkles upon droplet contraction under all solution conditions, revealing that soluble asphaltene nanoaggregate clusters can form a partially incompressible interfacial film. We hypothesize that soluble asphaltenes increase interfacial elasticity with decreasing solvent quality due to a decrease in cluster size which enhances filling efficiency and particle interactions akin to Pickering emulsions.

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Product Details of [ 85652-50-2 ]

CAS No. :85652-50-2
Formula : C50H48O4
M.W : 712.91
SMILES Code : O=C1C2=CC=CC=C2C3=CC(OCCCCCCCC)=C4C5=C3C1=CC=C5C6=CC=C(C7=C8C=C(OCCCCCCCC)C4=C76)C(C9=C8C=CC=C9)=O
MDL No. :MFCD00491570
InChI Key :LLPQZABTDLOYAL-UHFFFAOYSA-N
Pubchem ID :16217791

Safety of [ 85652-50-2 ]

GHS Pictogram:
Signal Word:Warning
Hazard Statements:H302-H315-H319-H335
Precautionary Statements:P261-P305+P351+P338
 

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