CONTENT AND TYPES OF VANADYL PORPHYRINS IN ASPHALTENES AND RESINS OF HEAVY OILS FROM VARIOUS PRODUCTIVE COMPLEXES

2017 ◽  
Author(s):  
Dmitry Milordov
Keyword(s):  
Heavy Oils

Microscopic versus process parameters in heavy-oil upgrading

1992 ◽  
Vol 50 (1) ◽  
pp. 366-367
Author(s):  
V.A. Munoz ◽  
R.J. Mikula ◽  
C. Payette ◽  
W.W. Lam
Keyword(s):  
Molecular Weight ◽  
Liquid Fuels ◽  
Chemical Components ◽  
Heavy Oils ◽  
Synthetic Fuels ◽  
High Hydrogen ◽  
Optical Texture ◽  
Polar Groups ◽  
Anisotropic Character ◽  
Planar Molecules

The transformation of high molecular weight components present in heavy oils into useable liquid fuels requires their decomposition by means of a variety of processes. The low molecular weight species produced recombine under controlled conditions to generate synthetic fuels. However, an important fraction undergo further recombination into higher molecular weight components, leading to the formation of coke. The optical texture of the coke can be related to its originating components. Those with high sulfur and oxygen content tend to produce cokes with small optical texture or fine mosaic, whereas compounds with relatively high hydrogen content are likely to produce large optical texture or domains. In addition, the structure of the parent chemical components, planar or nonplanar, determines the isotropic or anisotropic character of the coke. Planar molecules have a tendency to align in an approximately parallel arrangement to initiate the formation of the nematic mesophase leading to the formation of anisotropic coke. Nonplanar highly alkylated compounds and/or those rich in polar groups form isotropic coke. The aliphatic branches produce steric hindrance to alignment, whereas the polar groups participate in cross-linking reactions.

Microwave Assisted Gravity Drainage of Heavy Oils

2008 ◽  
Author(s):  
Birol Demiral ◽  
Serhat Akin ◽  
Cagdas Acar ◽  
Berna Hascakir
Keyword(s):  
Gravity Drainage ◽  
Heavy Oils ◽  
Microwave Assisted

ARTIFICIAL INTELLIGENCE APPLIED TO NMR LOGGING FOR ROCK AND FLUID TYPING IN HEAVY OILS

2019 ◽  
Author(s):  
Pedro Romero Rojas ◽  
◽  
Alexandrina Cristea ◽  
Paul Pavlakos ◽  
Okan Ergündüz ◽  
...  
Keyword(s):  
Artificial Intelligence ◽  
Heavy Oils ◽  
Nmr Logging

Measurement of Gas Diffusivity In Heavy Oils

10.2118/98-63 ◽  
1998 ◽  
Author(s):  
Y. Zhang ◽  
C.L. Hyndman ◽  
B. Maini
Keyword(s):  
Heavy Oils ◽  
Gas Diffusivity

Use of heavy oils (and derivatives) to process coal

Fuel ◽  
1980 ◽  
Vol 59 (9) ◽  
pp. 647-653 ◽  
Author(s):  
Speros E. Moschopedis ◽  
Randall W. Hawkins ◽  
John F. Fryer ◽  
James G. Speight
Keyword(s):  
Heavy Oils

Density functional theory investigation of the effect of axial coordination and annelation on the absorption spectroscopy of nickel(II) and vanadyl porphyrins relevant to bitumen and crude oils

2013 ◽  
Vol 91 (9) ◽  
pp. 872-878 ◽  
Author(s):  
Stanislav R. Stoyanov ◽  
Cindy-Xing Yin ◽  
Murray R. Gray ◽  
Jeffrey M. Stryker ◽  
Sergey Gusarov ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Polyaromatic Hydrocarbons ◽  
Geometry Optimization ◽  
Soret Band ◽  
Heavy Oils ◽  
Visible Absorption ◽  
Functional Theory ◽  
Axial Coordination ◽  
Td Dft

The vanadium and nickel components in heavy oils and bitumen are important impurities in catalytic processing and form aggregates with other asphaltene components. Metalloporphyrins are commonly analyzed using the characteristic Soret band in the UV–vis absorption spectrum. However, the Soret band of metalloporphyrins in petroleum is broadened and weaker than expected based on the concentration of Ni and V in heavy oils and the extinction coefficients of isolated porphyrins. We hypothesize that the low intensity and broadening of the Soret band could be due to axial coordination of the metal center or fusion (annelation) of aromatic rings on the porphyrin π-system. This hypothesis is examined using the density functional theory for geometry optimization and time-dependent density functional theory (TD-DFT) for calculation of excited states of nickel(II) and vanadyl porphyrins with axially coordinated ligands and annelated polyaromatic hydrocarbons. Predictions of the excited electronic states performed using the tandem of TD-DFT and conductor-like polarizable continuum model of solvation support this hypothesis and provide insight into the extent of Soret band broadening and intensity decrease due to coordination and annelation. These computational results, validated with respect to visible absorption spectra, are important for understanding asphaltene aggregation and spectroscopic characterization and suggest methods for removal of transition metals from heavy oil.

A Caustic Waterflooding Process for Heavy Oils

1974 ◽  
Vol 26 (12) ◽  
pp. 1344-1352 ◽  
Author(s):  
H.Y. Jennings ◽  
C.E. Johnson ◽  
C.D. McAuliffe
Keyword(s):  
Heavy Oils
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