The Surface Tension of Sulfur

Fanelli, Rocco

doi:10.1021/ja01165a050

Cited by 28 publications

(13 citation statements)

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“…Sulfur precipitation is induced by a reduction in the solubility of the sulfur in the gas phase beyond its thermodynamic saturation point as a result of decreases in pressure and temperature (to lower than the melting points). The changes in pressure and temperature occur during production operations and can result in sulfur deposition in the reservoir, wellbore, and surface facilities (Hands et al 2002;Shedid and Zekri 2006). Deposition of elemental sulfur in the near-wellbore region may significantly reduce the inflow performance of sourgas wells.…”

Section: Introductionmentioning

confidence: 99%

Effect of Elemental-Sulfur Deposition on the Rock Petrophysical Properties in Sour-Gas Reservoirs

Mahmoud

2013

SPE Journal

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The deposition of elemental sulfur as a solid phase results in plugging the pore space available for gas flow and reduces the reservoir productivity. Elemental sulfur also can be deposited as a liquid phase if the reservoir temperature is greater than 115 C. The liquid sulfur restricts the inflow of gas because of the big density difference between liquid sulfur and gas, which could be 20 times or more. For isothermal conditions in the reservoir, the reduction in reservoir pressure to lower than a critical value causes the elemental sulfur to deposit in the formation, and in turn the gas-well productivity is affected. Accurate prediction of sulfur deposition will help better manage sour-gas reservoirs with potential sulfur-deposition problems.In this paper, a new analytical model was developed to predict the effect of sulfur deposition on the damage of the near-wellbore region. The damage was quantified through the investigation of the effect of sulfur deposition on rock porosity, relative permeability of the gas phase, and the change in rock wettability. The main objective of this model is to investigate the effect of radial distance on formation damage. Different rock-and fluid-property correlations were used in the model. Previous studies did not consider the change in gas properties with pressure, and numerically modeled the sulfur deposition as a condensate in a gas/condensate reservoir. This paper will consider sulfur adsorption, and the actual physical properties of the sulfur will be used in the developed model. The optimum gas-flow velocity that will maximize the sulfur solubility in the gas will be determined. A coreflood experiment was performed to determine the effect of sulfur deposition on the carbonate-rock permeability, porosity, and wettability. The experiment was used to determine the effect of sulfur adsorption on the rock petrophysical properties. The contact angle was measured for a carbonate core saturated with sulfur by use of a pendant-drop tensiometer.Analytical and numerical solutions showed that the deposition of sulfur was affected by the radial distance from the wellbore and sulfur-solubility changes as a function of the pressure drop. Sulfur deposition was found to have a great effect on the rock wettability, and in turn the gas production will be affected. The model can be used to predict the critical flow velocity that the gas can flow without precipitating sulfur. The optimum gas-flow velocity was estimated to be a range that maximizes the sulfur solubility in the gas. It was confirmed experimentally that the sulfur deposition reduced the carbonate-core porosity and permeability, and changed the contact angle (rock wettability). The contact angle increased, which means sulfur adsorption on the rock surfaces changed the rock toward more-gas-wet rock.

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Section: Introductionmentioning

confidence: 99%

Effect of Elemental-Sulfur Deposition on the Rock Petrophysical Properties in Sour-Gas Reservoirs

Mahmoud

2013

SPE Journal

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“…In contrast to these efforts, a relatively overlooked factor is that the low-to-moderate compatibility of sulfur or sulfur-dissolved solution (typically, a sulfur/CS 2 solution) with carbon causes difficulty in completely loading sulfur into the porous carbon host (22,23). Recent studies have introduced various metal compounds for improved adsorption of PSs, but, due to their relatively low content, the compatibility with carbon surfaces is still important (24)(25)(26).…”

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Complete encapsulation of sulfur through interfacial energy control of sulfur solutions for high-performance Li−S batteries

Gueon

Moon

2020

Proc. Natl. Acad. Sci. U.S.A.

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Complete encapsulation of high-content sulfur in porous carbon is crucial for high performance Li−S batteries. To this end, unlike conventional approaches to control the pore of carbon hosts, we demonstrate controlling the interfacial energy of the solution in the process of penetrating the sulfur-dissolved solution. We unveil, experimentally and theoretically, that the interfacial energy with the carbon surface of the sulfur solution is the key to driving complete encapsulation of sulfur. In the infiltration of sulfur solutions withN-methyl-2-pyrrolidone, we achieve complete encapsulation of sulfur, even up to 85 wt %. The sulfur fully encapsulated cathode achieves markedly high volumetric capacity and stable cycle operation in its Li−S battery applications. We achieve a volumetric capacity of 855 mAh/cm3at 0.2C and a capacity reduction of 0.071% per cycle up to 300 cycles at 1C.

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“…Sulfur was impregnated into the hosts by simply melt‐diffusion method at 155 °C. Owing to the relatively high interfacial tension of sulfur, good wettability is necessary for uniform impregnation of sulfur, especially under high sulfur content. Firstly, we evaluated the diffusion of molten sulfur in Co‐NCNTs/NS films and compared with commercial CNTs and the mixture of NCNTs and CoAl 2 O 4 nanosheets(NCNTs+NS).…”

Section: Resultsmentioning

confidence: 99%

3D Hierarchical CNT‐Based Host with High Sulfur Loading for Lithium‐Sulfur Batteries

Qiu

Wang

et al. 2019

ChemElectroChem

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A host material capable of efficiently transporting electrons, uniformly impregnating sulfur and effectively anchoring lithium polysulfide, is the key to realizing high‐loading lithium‐sulfur batteries. In this paper, we construct a three‐dimensional hierarchical host formed by one‐dimensional nitrogen‐doped carbon nanotubes(NCNTs) grown in situ on both sides of two‐dimensional oxides nanosheets. The uniformly grown NCNTs not only provide excellent overall conductivity, but also prevent stacking between two‐dimensional nanosheets, providing hierarchical pores for diffusion of molten sulfur, which is beneficial to the uniform impregnating of sulfur. Meanwhile, the two‐dimensional oxides nanosheets(NS) and cobalt nanoparticles have a strong chemical affinity with polysulfide, promoting the polysulfides adsorption and redox kinetics. Benefiting from the synergistic effects, Li−S batteries based on Co‐NCNTs/NS@S cathode delivers a high discharge capability of 1552 mAh g−1 at 0.1 C with a high sulfur content of 80 %, excellent rate capability of 860 mAh g−1 at 2 C and outstanding cycle life with a low capacity decay rate of 0.04 % per cycle over 550 cycles. Even at high sulfur loading of 4.8 mg cm−2, the cathode still exhibits an areal capacity of 4.6 mAh cm−2 after 100 cycles at 0.2 C.

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The Surface Tension of Sulfur

Cited by 28 publications

References 0 publications

Effect of Elemental-Sulfur Deposition on the Rock Petrophysical Properties in Sour-Gas Reservoirs

Effect of Elemental-Sulfur Deposition on the Rock Petrophysical Properties in Sour-Gas Reservoirs

Complete encapsulation of sulfur through interfacial energy control of sulfur solutions for high-performance Li−S batteries

3D Hierarchical CNT‐Based Host with High Sulfur Loading for Lithium‐Sulfur Batteries

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