Asphaltene adsorption on quartz sand in the presence of pre-adsorbed water

Gonzalez, Valeska; Taylor, Spencer E.

doi:10.1016/j.jcis.2016.07.014

Cited by 47 publications

(48 citation statements)

References 59 publications

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“…For the adsorption experiments, the required mass (ms, ranging between 0.04-5 g) of ambient relative humidity (RH) kaolinite was weighed directly into separate 20 mL glass scintillation vials. RH was not controlled for this adsorbent, as we reported previously for sand, 25 although Hatch et al 35 showed the water coverage to be 1 monolayer and relatively insensitive to RH between 20-60%, typical of our experimental conditions. 25 Using a calibrated micropipette, 10 mL of the asphaltene solutions was slowly added to each of the vials containing the weighed kaolinite, which were then sealed with foil-lined screw caps.…”

Section: Isothermal Adsorption Experimentsmentioning

confidence: 62%

“…RH was not controlled for this adsorbent, as we reported previously for sand, 25 although Hatch et al 35 showed the water coverage to be 1 monolayer and relatively insensitive to RH between 20-60%, typical of our experimental conditions. 25 Using a calibrated micropipette, 10 mL of the asphaltene solutions was slowly added to each of the vials containing the weighed kaolinite, which were then sealed with foil-lined screw caps. The vials were left to equilibrate at 23 ± 1 C for 24 hours on a roller mixer (Stuart) which allows adequate time for adsorption equilibrium to be established (from measurements made at different times) and ensures uniform distribution of the solution and mineral particles.…”

Section: Isothermal Adsorption Experimentsmentioning

confidence: 62%

“…8 In general, the results from adsorption studies carried out over the years have been found to be consistent with classical adsorption models, as we have also demonstrated recently for quartz sand. 25 However, notwithstanding the general principles set out in previous studies, crude oil components are not 'classical' surface-active species as was pointed out by Czarnecki et al in connection with their role in water-in-oil emulsion stabilization, 22,23 and it might therefore be expected that adsorption could also depart from the expected models on other surfaces. Herein, we report results from batch adsorption experiments on asphaltenes and resins that follow significantly different trends, and, as will be seen, lend support to recent work reported by Guzmán et al 3 and Wang et al 26 Fur-ther, they relate to the fundamental understanding of asphaltene solution and surface behavior, as well as to applied areas.…”

Section: Introductionmentioning

confidence: 97%

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Adsorption Behavior of Asphaltenes and Resins on Kaolinite

Tsiamis

Taylor

2017

Energy Fuels

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Recent studies have shown that n-C7-precipitated asphaltenes adsorb onto nanoparticles to produce iso-therms that are significantly influenced by the dispersed states of both the adsorbate and adsorbent. In the present work, we investigate this behavior further by determining the adsorption of asphaltene and resin fractions isolated from four different sources onto kaolinite using the depletion method in toluene. Treated conventionally (amount adsorbed, , ver-sus equilibrium bulk concentration, ce), adsorption isotherms for fixed initial concentrations (c0) of C5 and C7 asphaltenes and variable kaolinite mass (ms) are found to be Type I as classified by IUPAC, whereas under the same experimental conditions C5-C7 resins exhibit Type III behavior. By fixing ms and varying c0, however, Type II isotherms are produced by the resins. All the adsorption results for the same fraction type were found to be very similar, irrespective of the source. The Types I and III isotherms are described very well by the thermodynamic solid-liquid equilibrium (SLE) model of Montoya et al. (Energy Fuels 2014, 28, 4963−4975) based on association theory of Talu and Meunier (AIChE J. 1996, 42, 809-819). Individual isotherms ( versus ce) are well-fitted by a shifted Langmuir equation for asphaltenes, and by a gen-eral Freundlich (power law) relationship for resins. The SLE results verify that in toluene solution the adsorption behavior is complicated by concentration-dependent nanoaggregation of asphaltene species, whereas resin-resin interactions are weaker, but accompanied by adsorbent particle aggregation. On the other hand, when the adsorption data for each frac-tion type is re-plotted in terms of the ratio of the experimental parameter c0/ms, as originally done by Wang et al. (Col-loids Surfaces A: Physicochem. Eng. Aspects 2016, 504, 280–286), each set of data merges to a single isotherm which is rea-sonably well approximated by a Langmuir-type relationship (we term this a “pseudo-Langmuir equation”), which allows the maximum adsorption to be determined for the different adsorbate/adsorbent systems. The average maximum ad-sorbed amounts calculated in this way for each of the component types are very similar, being slightly larger for C7A compared with C5A, with the values for the C5-C7R fractions being generally lower and more variable, possibly reflecting some source dependence

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Section: Isothermal Adsorption Experimentsmentioning

confidence: 62%

Section: Isothermal Adsorption Experimentsmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 97%

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Adsorption Behavior of Asphaltenes and Resins on Kaolinite

Tsiamis

Taylor

2017

Energy Fuels

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“…Asphaltene is the part of oil containing these polar components, and -hence -their adsorption onto rock surface governs the process of irreversible adsorption (deposition) and wettability alteration (Buckley et al, 1997). How asphaltene adsorbs in the presence of thin water films has been investigated by several groups, e.g., (Hu et al, 2019;Daughney, 2000;Gonzalez and Taylor, 2016). Gonzalez and Taylor (2016) investigated how asphaltenes adsorb onto quartz powder by varying thickness of the pre-adsorbed water.…”

Section: Introductionmentioning

confidence: 99%

Novel Approach to Study the Impact of Asphaltene Properties on Low Salinity Flooding

Hassan

Yutkin

Kamireddy

et al. 2020

SPE Annual Technical Conference and Exhibition

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Low salinity water flooding (LSW) has gained significant attention, because of its advantages compared with other enhanced oil recovery (EOR) methods. LSW's positive contribution to recovery factor has been demonstrated in the literature at lab and field scales. However, LSW flooding does not always increment oil recovery. It is a specific combination of properties of an asphaltenic crude oil, chemically equilibrated brine, and rock surface that may explain the success or failure of LSW. In this work, we introduce a novel experimental approach to study asphaltene-like chemical interactions with surfaces rock minerals to evaluate the effectiveness of applying LSW. When studying the impact of asphaltene properties on incremental recovery, one aims to detach some of the immobile oil, which is semi-irreversibly stuck on rock surface. This is a difficult task, because of varying crude oil composition, as well as asphaltene interfacial and chemical properties. To overcome these issues, we split the problem into several parts. We study how mono-and poly-functional chemical compounds mimic asphaltene interactions with mineral surfaces, like silica and calcium carbonate, which are proxies for sandstones and limestones, respectively. For example, amines, quaternary ammonia or carboxylates represent asphaltene functional groups that are mainly responsible for crude oil base and acid numbers, respectively. Adsorption of polymers and oligomers containing such groups mimics the irreversible asphaltene deposition onto rock surface through formation of chemically active polymerlike structures at the oil-brine interface. The silica surface is negatively charged in brines with pH above 2. Silica attracts positively charged ammonia salts, such as cetrimonium chloride (CTAC). However, negatively charged mono-functional carboxylates, i.e. anionic surfactants, like sodium hexanoate (NaHex), hardly adsorb onto silica, even in the presence of a bridging ion, like calcium. In contrast to silica, calcium carbonate surface has both positive and negative charges on its surface. We found that CTAC adsorbs onto calcium carbonate in any brine tested. NaHex shows minimal adsorption onto calcium carbonate only in the presence of calcium ions suggesting a contribution of an ion-bridging mechanism. Adsorption of all studied mono-functional surfactants is fully reversible and, consequently not representative of asphaltenes. Multifunctional compounds, i.e., polymers, demonstrate irreversible, asphaltene-like, adsorption. We studied adsorption of carbohydrates decorated with individual amines and quaternary ammonia functional groups. The carbohydrates with amine functional groups adsorb irreversibly on calcium carbonate and silica in all tested brines with pH up to 10. Therefore, a lower base number (BN) in crude oils indicates a higher potential for LSW. Our findings demonstrate the proof of concept that contribution of different functional groups to asphaltene adsorption/deposition can be studied using functionalized water-soluble polymers. This fr...

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“…Among the efficient ways of removal of asphaltenes and metal complexes from oils and studying their structure, the adsorption (deposition) of the oils and their structural units on the surface of different supports is widely used and is a matter of intensive studies [10][11][12][13][14][15]. Besides the rapid removing of asphaltenes from the heavy oil making therefore the remaining fraction of oil transportable for conventional processing, the mentioned supports (especially in the form of nanoparticles) could be employed as catalysts for upgrading asphaltenes into light usable distillates [10].…”

Section: Introductionmentioning

confidence: 99%

High-Field (3.4 T) ENDOR Investigation of Asphaltenes in Native Oil and Vanadyl Complexes by Asphaltene Adsorption on Alumina Surface

et al. 2019

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Vanadyl porphyrin complexes in asphaltenes from heavy (Karmalinskoye) oil and in asphaltene films obtained as a result of adsorption on the surface of aluminum oxide were studied by electron paramagnetic resonance (EPR) and double electron-nuclear resonance (ENDOR) in the W-band frequency range (microwave frequency of 95 GHz, magnetic field of 3.4 T). Mims ENDOR spectra from 1H and 27Al nuclei are observed. ENDOR spectra are different for native oil and asphaltenes from one side and the adsorbed samples from the other side while no significant changes in X- (microwave frequency of 9 GHz) or W-band EPR spectra are found. The results allow supposing that vanadyl porphyrin complexes (at least in the studied asphaltene films) participate in the formation of asphaltene aggregates through the functional groups rather than π−π interactions. The data show the feasibility of the commercial pulsed ENDOR approaches for the investigation of crude oils and their constituents under external influence.

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Asphaltene adsorption on quartz sand in the presence of pre-adsorbed water

Cited by 47 publications

References 59 publications

Adsorption Behavior of Asphaltenes and Resins on Kaolinite

Adsorption Behavior of Asphaltenes and Resins on Kaolinite

Novel Approach to Study the Impact of Asphaltene Properties on Low Salinity Flooding

High-Field (3.4 T) ENDOR Investigation of Asphaltenes in Native Oil and Vanadyl Complexes by Asphaltene Adsorption on Alumina Surface

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