Preparative Subfractionation of Petroleum Resins and Asphaltenes. II. Characterization of Size Exclusion Chromatography Isolated Fractions

Carbognani, Lante; Espidel, J.

doi:10.1081/lft-120024558

Cited by 15 publications

(22 citation statements)

References 33 publications

(23 reference statements)

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“…32 SEC preparative separation of asphaltenes showed that the eluates of higher apparent MW were the most aggregative fractions, possessing the higher contents of heteroatoms and lower H/C ratios. 33,34 The Canadian province of Alberta possesses one of the most abundant bitumen reserves worldwide, thus, surplus of asphaltenes from upgrading processes is a fact affecting the province from the environmental and economic points of view. Among feasible ways under study for asphaltenes valorization, oxidative reactions 35 and/or nanocatalytic asphaltene hydroprocessing 36 are underway; thus, requiring substantial amounts of asphaltene feedstocks to carry out the studies.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Precipitating Conditions on Asphaltene Properties and Aggregation

et al. 2015

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Asphaltenes, resins and maltenes physical isolation procedures involving different alkane precipitants and solvent/sample ratios were applied in this work to Athabasca bitumen vacuum residue. Samples were characterized by Solubility Profiling, Size Exclusion Chromatography, Fluorescence Spectroscopy, X-ray Photoelectron Spectroscopy and density-viscosity analyses. Isolated fractions were found to display systematic property changes. Thus, it was found that denser, more polar, higher molecular weight (MW), more viscous, red shifted fluorescence materials were sequentially ranked as follows: Solvent extracted asphaltenes -C7 (unwashed) asphaltenes -C5 (unwashed) asphaltenes -resins -maltenes. Intermolecular aggregation for these fractions was determined to follow the same order. Decreasing contents of resins in the same order were found to increase aggregation phenomena.This work further reported on aspects of possible practical interest, i.e., the liquid nature of asphaltenes at 300°C and, possible existence of oxidative reactions affecting fractions isolation that follow standard methods which do not contemplate inert atmospheres. Preliminary assessment of chemical functionalities within isolated fractions highlighted on the possible enrichment of pyrrolic compounds within resins and oxygen functionalities in asphaltenes.

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Section: Introductionmentioning

confidence: 99%

“…aggregation phenomena have been studied relying on SEC literature,23,25,26,31,33,34,46,47 being re-aggregation phenomena of low MW pre-separated fractions toward high MW entities that eluted at higher apparent MWs, reported before 33. …”

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confidence: 99%

Effect of Precipitating Conditions on Asphaltene Properties and Aggregation

et al. 2015

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“…There are many studies in the open literature dealing with sampling and identification of many different compounds present in those fractions and the changes that they undergo when submitted to different treatments and solvent extraction procedures. Thus far, many families of compounds have been identified by diverse techniques involving solvent extraction procedures, fractionation, and reactions and their subsequent identification by many analytical techniques: gas chromatography–mass spectrometry (GC-MS), − size exclusion chromatography, and NMR or by direct measurement using spectroscopy techniques, such as infrared (IR), , X-ray absorption near-edge spectroscopy (XANES), − near-UV/visible absorption spectroscopy, time-of-flight secondary-ion mass spectrometry (TOF-SIMS), , Auger electron spectroscopy, and X-ray photoelectron spectroscopy (XPS), − although with a limited scope and some of them with errors . Many of these techniques have been discussed in more detail by Merdrignac and Espinat .…”

Section: Introductionmentioning

confidence: 99%

X-ray Photoelectron Spectroscopy Analysis of Hydrotreated Athabasca Asphaltenes

et al. 2017

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C7 asphaltenes from Athabasca crude oil were hydrotreated using a commercial NiW/Al2O3 catalyst and analyzed using X-ray photoelectron spectroscopy. Results showed that the catalyst performed better in the removal of sulfur rather than nitrogen and that sulfur concentration is higher at the surface in comparison to the bulk structure. Moreover, the sample after reaction had a higher oxygen content in comparison to the untreated asphaltene, indicating poor hydrodeoxygenation performance of the catalyst in addition to a higher reactivity toward atmospheric oxygen at the surface of the asphaltene. The latter is proposed to arise once the layer of resin covering the asphaltene is partially converted during the hydrotreating process.

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“…Band near 1030 cm −1 can be related to ester linkages or sulfoxides (Wilt et al 1998). Band near 1260 cm −1 can be attributed to groups containing singly bonded oxygen, e.g., esters or ethers (Carbognani and Espidel 2003). The distinct band observed at 1600 cm −1 is related to the aromatic C=C-stretching vibrations.…”

Section: Quality Assurance Of Datamentioning

confidence: 99%

Application of cyanated asphaltenes in gas-phase adsorption processes for removal of volatile organic compounds

et al. 2019

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The paper presents an innovative, chemically modified (methylcyanated) asphaltene-based adsorbent that can be an interesting low-cost alternative for traditional adsorbents. Adsorption properties of adsorbents were examined by inverse gas chromatography technique, adsorption isotherms, and breakthrough curves. A significant increase in retention volume for pyridine, 2-pentanone, nitropropane, toluene, and 1-butanol was observed. Rohrschneider–McReynolds constants revealed an increase in strength of interactions as a result of the modification, especially in strong proton–acceptor interaction (by a factor of 4.6). The surface-free energy of asphaltene adsorbents increased from 136.71 to 169.95 mJ m−2 after modification. It is similar to the surface-free energy of silica or alumina. Moreover, modified adsorbent shows very high adsorption potential for pyridine. Adsorption isotherms revealed that monolayer adsorption capacity for pyridine increased 1.5 times after modification. Breakthrough curves of pyridine indicate that chemical modification increased the adsorption capacity, removal efficiency, and throughput. Scale-up calculations revealed that adsorption column packed with modified asphaltene adsorbent would be almost two times smaller compared to a column packed with unmodified one. Graphic abstract

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Preparative Subfractionation of Petroleum Resins and Asphaltenes. II. Characterization of Size Exclusion Chromatography Isolated Fractions

Cited by 15 publications

References 33 publications

Effect of Precipitating Conditions on Asphaltene Properties and Aggregation

Effect of Precipitating Conditions on Asphaltene Properties and Aggregation

X-ray Photoelectron Spectroscopy Analysis of Hydrotreated Athabasca Asphaltenes

Application of cyanated asphaltenes in gas-phase adsorption processes for removal of volatile organic compounds

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