Kinetic features of ammonium persulfate decomposition in aqueous medium

Борисов, И. М.; Luksha, R. S.; Rashidova, S. T.

doi:10.1007/s11172-015-1185-y

Cited by 12 publications

(6 citation statements)

References 1 publication

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“…All four free-radical initiators have half-lives at 80 °C that are substantially longer than the time required to polymerize the droplets. The shortest-lived initiator is APS, with a half-life of 1.8 h. 47 KPS has a half-life of 2 h, 48 AIBN has a half-life of 6 h, and ACHN has a half-life of 30 h. The results in Figure 7 therefore suggest that heating for more than half an hour will not substantially alter these particles' properties. Because holographic characterization can be performed in a matter of minutes, this information can be used to minimize heating time and thus energy cost in emulsion polymerization.…”

Section: ■ Results and Discussionmentioning

confidence: 92%

Optimizing the Synthesis of Monodisperse Colloidal Spheres Using Holographic Particle Characterization

et al. 2019

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Holographic particle characterization measures the sizes and compositions of individual colloidal particles dispersed in fluid media and rapidly amasses statistics on the distributions of these properties, even for complex heterogeneous dispersions. This information is useful for analyzing and optimizing protocols for synthesizing colloidal particles. We illustrate how holographic characterization can guide process design through a case study on a particularly versatile model system composed of an aqueous dispersion of micrometer-scale spheres synthesized from the organosilane monomer 3-(trimethoxysilyl)propyl methacrylate.

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Section: ■ Results and Discussionmentioning

confidence: 92%

Optimizing the Synthesis of Monodisperse Colloidal Spheres Using Holographic Particle Characterization

et al. 2019

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“…As will be shown, the presence of these additives does not impact the rate or extent of celestite formation. Ammonium persulfate is almost entirely dissociated under heat activation at temperatures above 52 °C, , as follows , Hence, based on eqs and , we represent the presence of persulfate by prescribing a respective SO 4 2– concentration following the appropriate stoichiometry and assuming that the compound has completely and immediately dissociated under the target temperature of 80 °C. The complete set of equilibrium reactions and chemical species involved in the shale-free systems are described in Supporting Information S2, Table S2.1.…”

Section: Methodsmentioning

confidence: 99%

“…As will be shown, the presence of these additives does not impact the rate or extent of celestite formation. Ammonium persulfate is almost entirely dissociated 35 under heat activation at temperatures above 52 °C, 1,11 as follows 36,37…”

Section: Methodsmentioning

confidence: 99%

Geochemical Modeling of Celestite (SrSO₄) Precipitation and Reactive Transport in Shales

Esteves

Spielman-Sun

et al. 2022

Environ. Sci. Technol.

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Celestite (SrSO4) precipitation is a prevalent example of secondary sulfate mineral scaling issues in hydraulic fracturing systems, particularly in basins where large concentrations of naturally occurring strontium are present. Here, we present a validated and flexible geochemical model capable of predicting celestite formation under such unconventional environments. Simulations were built using CrunchFlow and guided by experimental data derived from batch reactors. These data allowed the constraint of key kinetic and thermodynamic parameters for celestite precipitation under relevant synthetic hydraulic fracturing fluid conditions. Effects of ionic strength, saturation index, and the presence of additives were considered in the combined experimental and modeling construction. This geochemical model was then expanded into a more complex system where interactions between hydraulic fracturing fluids and shale rocks were allowed to occur subject to diffusive transport. We find that the carbonate content of a given shale and the presence of persulfate breaker in the system strongly impact the location and extent of celestite formation. The results of this study provide a novel multicomponent reactive transport model that may be used to guide future experimental design in the pursuit of celestite and other sulfate mineral scale mitigation under extreme conditions typical of hydraulic fracturing in shale formations.

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“…The experiment temperature was chosen as 60 °C since the decomposition of APS is faster at higher temperatures. 45,46 To calculate the monomer conversions, 1 ml of samples were taken from the reactor at 30 min time intervals throughout the experiments. The samples, were then dried in a vacuum oven at 80 °C until constant weight was attained, and the monomer conversions were determined gravimetrically.…”

Section: Experimental Set-upmentioning

confidence: 99%

Cost-Effective Control of Molecular Weight in Ultrasound-Assisted Emulsion Polymerization of Styrene

Korkut

Erden²,

Özbay³

2022

ACSi

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This paper focuses on the determination of economically most feasible conditions to obtain polystyrene with various target molecular weights through ultrasound-assisted emulsion polymerization. Briefly, batch polymerizations of styrene have been performed by ultrasound-assisted emulsion polymerization process using different reaction feed compositions. Polymerization rates were calculated using the monomer conversions at various reaction times. Also, molecular weights of the synthesized polymers, as well as the Mark-Houwink constants, were determined by intrinsic viscosity and gel permeation chromatography measurements. It was found that the polydispersity index of the polymers is ranging from 1.2 to 1.5, and the viscosity average molecular weights are in between 100000–1500000 g/mol depending on the reaction conditions. Finally, model equations were also developed for response variables, and the most economical ways of reaching various target molecular weights were interpreted by response surface methodology based multi objective optimization.

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Kinetic features of ammonium persulfate decomposition in aqueous medium

Cited by 12 publications

References 1 publication

Optimizing the Synthesis of Monodisperse Colloidal Spheres Using Holographic Particle Characterization

Optimizing the Synthesis of Monodisperse Colloidal Spheres Using Holographic Particle Characterization

Geochemical Modeling of Celestite (SrSO₄) Precipitation and Reactive Transport in Shales

Cost-Effective Control of Molecular Weight in Ultrasound-Assisted Emulsion Polymerization of Styrene

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Kinetic features of ammonium persulfate decomposition in aqueous medium

Cited by 12 publications

References 1 publication

Optimizing the Synthesis of Monodisperse Colloidal Spheres Using Holographic Particle Characterization

Optimizing the Synthesis of Monodisperse Colloidal Spheres Using Holographic Particle Characterization

Geochemical Modeling of Celestite (SrSO4) Precipitation and Reactive Transport in Shales

Cost-Effective Control of Molecular Weight in Ultrasound-Assisted Emulsion Polymerization of Styrene

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Geochemical Modeling of Celestite (SrSO₄) Precipitation and Reactive Transport in Shales