Obituary: A. S. Kertes

Clever, H. Lawrence; Gevantman, L.H.

doi:10.1351/pac198961020121

Cited by 4 publications

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“…This explains why methane is less soluble in toluene as compared to n -heptane and heptol50. The mole fractions of methane gas in n -heptane and toluene were compared with the literature values at similar equilibrium temperature and pressure (∼277.6 K, 5.6 MPa for n -heptane and 6.8 MPa for toluene), which supported the solubility trend as obtained in our tests. − Apart from the interface, hydrates can form in bulk when the enhanced methane saturation in water results from the dissolution process. , In our case, methane is the least soluble in toluene as compared to other systems, so more gas is available to saturate in the water phase. This, along with a more developed oil–water interface (less density difference with water), and the lower methane solubility could facilitate higher methane gas consumption during hydrate formation as compared to the system containing lighter hydrocarbons with a higher methane solubility.…”

Section: Resultssupporting

confidence: 84%

Effect of Asphaltenes on the Kinetics of Methane Hydrate Formation and Dissociation in Oil-in-Water Dispersion Systems Containing Light Saturated and Aromatic Hydrocarbons

2021

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Proper understanding of the interaction of individual components of crude oil with hydrate formation and dissociation is essential to design an effective mitigation strategy for hydrate blockage, especially in offshore flowlines. In this study, various isothermal methane hydrate formation and dissociation kinetics experiments have been carried out in oil-in-water dispersion systems to understand the effect of liquid hydrocarbons (such as n-heptane and toluene) and asphaltenes with varying concentrations at 8 MPa and 275.15 K. To correlate the results obtained from the kinetics experiments, solubility tests and interfacial tension measurements have also been carried out. It was observed that aromatic hydrocarbons (e.g., toluene) in the system led to less dissolution of methane gas as compared to alkanes (e.g., n-heptane). This, along with the more developed oil− water interface due to the lower density difference with water, made the system more vulnerable to hydrate formation, and it displayed secondary hydrate induction. The presence of asphaltenes in the oil−water system showed higher gas consumption during hydrate formation at lower concentrations, possibly due to flocculated asphaltene molecules at the oil−water interface acting as nucleation sites for hydrate formation. As the concentration of asphaltene increases, the growth of hydrate crystals is found to be limited, as more asphaltene molecules tend to restrict the gas diffusion toward the water phase, controlling the growth kinetics during hydrate formation. The hydrate dissociation experiments suggest that the presence of flocculated asphaltenes in the system has delayed the dissociation of methane hydrate crystals for some time. The findings of this study will help gain an insight into the interaction of asphaltene, alkanes, and aromatics on the kinetics of methane hydrate formation and dissociation suitable for flow assurance applications.

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Section: Resultssupporting

confidence: 84%

Effect of Asphaltenes on the Kinetics of Methane Hydrate Formation and Dissociation in Oil-in-Water Dispersion Systems Containing Light Saturated and Aromatic Hydrocarbons

2021

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“…At the end of 2001, with the dissolution of most existing commissions, the Commission had a 22-year lifetime, and this landmark prompted the preparation of this present brief history. Many details are given here that complement accounts that have appeared in part in other publications, [5][6][7] including the obituary of Stevan Kertes,6,7 the person most responsible for the establishment of the Solubility Data Project.…”

mentioning

confidence: 92%

IUPAC Solubility Data Project 1973−2001

Clever

2004

J. Chem. Eng. Data

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“…This stems from the fact that among various properties determining the use of these compounds, the solubility is of the paramount importance. Among others, this issue has been the subject of intense activities initiated in 1979 by the Solubility Data Commission V.8 of the IUPAC Analytical Chemistry Division established and headed by S. Kertes [1], who conceived the IUPAC-NIST Solubility Data Series (SDS) project [2,3]. Within 1979-2009, the series of 87 volumes, concerning the solubility of gases, liquids, and solids in liquids or solids, were issued [3]; one of the volumes concerns the solubility of various oxides and hydroxides [4].…”

Section: Introductionmentioning

confidence: 99%

Solubility Products and Solubility Concepts

Michałowska-Kaczmarczyk¹,

Spórna‐Kucab²,

Michałowski³

2017

Descriptive Inorganic Chemistry Researches of Metal Compounds

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The chapter refers to a general concept of solubility product K sp of sparingly soluble hydroxides and different salts and calculation of solubility of some hydroxides, oxides, and different salts in aqueous media. A (criticized) conventional approach, based on stoichiometry of a reaction notation and the solubility product of a precipitate, is compared with the unconventional/correct approach based on charge and concentration balances and a detailed physicochemical knowledge on the system considered, and calculations realized according to generalized approach to electrolytic systems (GATES) principles. An indisputable advantage of the latter approach is proved in simulation of static or dynamic, two-phase nonredox or redox systems. Descriptive Inorganic Chemistry Researches of Metal Compounds 94an organized manner-not just imitative, but focused on heuristics. This viewpoint is in accordance with constructivist teaching, based on the belief that learning occurs, as learners are actively involved in a process of meaning and knowledge construction, as opposed to passively receiving information [19]. Definitions and formulation of solubility productsThe K sp value refers to a two-phase system where the equilibrium solid phase is a sparingly soluble precipitate, whose K sp value is measured/calculated according to defined expression for the solubility product. This assumption means that the solution with defined species is saturated against this precipitate, at given temperature and composition of the solution. However, often a precipitate, when introduced into aqueous media, is not the equilibrium solid phase, and then this fundamental requirement is not complied, as indicated in examples of the physicochemical analyses of the systems with struvite MgNH 4 PO 4 [20, 21], dolomite CaMg(CO 3 ) 2 [22, 23], and Ag 2 Cr 2 O 7 .The values of solubility products K sp (usually represented by solubility constant pK sp = ÀlogK sp value) are known for stoichiometric precipitates of A a B b or A a B b C c type, related to dissociation reactions:where A and B or A, B, and C are the species forming the related precipitate; charges are omitted here, for simplicity of notation. The solubility products for more complex precipitates are unknown in the literature. The precipitates A a B b C c are known as ternary salts [24], e.g., struvite, dolomite, and hydroxyapatite Ca 5 (PO 4 ) 3 OH.

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Obituary: A. S. Kertes

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Cited by 4 publications

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Effect of Asphaltenes on the Kinetics of Methane Hydrate Formation and Dissociation in Oil-in-Water Dispersion Systems Containing Light Saturated and Aromatic Hydrocarbons

Effect of Asphaltenes on the Kinetics of Methane Hydrate Formation and Dissociation in Oil-in-Water Dispersion Systems Containing Light Saturated and Aromatic Hydrocarbons

IUPAC Solubility Data Project 1973−2001

Solubility Products and Solubility Concepts

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