Adsorption of sodium dodecyl sulfate onto clathrate hydrates in the presence of salt

Salako, O.; Lo, C.; Zhang, J.S.; Couzis, Alexander; Somasundaran, P.; Lee, Jae Woo

doi:10.1016/j.jcis.2012.07.017

Cited by 18 publications

(15 citation statements)

References 20 publications

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“…Adsorption isotherms are useful to investigate the characteristics of adsorbates at the liquid/solid interface [49,50]. Figure 7 presents the adsorption isotherm of TTPC and DTAC on quartz surface.…”

Section: Adsorption Isotherm Measurementsmentioning

confidence: 99%

Discovery of a Novel Cationic Surfactant: Tributyltetradecyl-Phosphonium Chloride for Iron Ore Flotation: From Prediction to Experimental Verification

Pan

Gao

et al. 2017

Minerals

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Abstract:In this work, tributyltetradecyl-phosphonium chloride (TTPC), has been first introduced to be a novel and efficient cationic surfactant for cationic reverse flotation separation of quartz from magnetite. The first-principles density functional theory calculations, Zeta potential measurements and adsorption isotherm measurements consistently predict that TTPC may be a promising collector that is better than dodecyl triethyl ammonium chloride (DTAC), based on the facts that TTPC and DTAC both prefer to physically adsorb on the quartz surface owing to electrostatic force, but the active part (P + (C 4 H 9 ) 3 ) of TTPC takes much more positive charges than that (N + (CH 3 ) 3 ) of DTAC. The micro-flotation and Bench-scale flotation results further verify that TTPC presents a stronger collecting power and much better selectivity for iron ore reverse flotation in comparison to the conventional collector DTAC. Furthermore, the corresponding adsorption mechanism of TTPC on the quartz have also been investigated in detail. This work might show a good example to discover a potential candidate collector by analogy with a known excellent collector based on reasonable prediction.

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Section: Adsorption Isotherm Measurementsmentioning

confidence: 99%

Discovery of a Novel Cationic Surfactant: Tributyltetradecyl-Phosphonium Chloride for Iron Ore Flotation: From Prediction to Experimental Verification

Pan

Gao

et al. 2017

Minerals

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“…However, in the case of the use of SDS (1 mM)−NaCl (25 mM) and SDS (2.5 mM)−NaCl (10 mM) solutions, whose NaCl concentrations were chosen to make sure that SDS molecules are not precipitated from the solution, 22 the maximum values of the net adhesion forces were lower ( Figure 13b) than the values of the cases using the same SDS concentrations without NaCl. This phenomenon can be understood from the interaction between SDS and NaCl in the aqueous phase.…”

Section: Energy and Fuelsmentioning

confidence: 99%

Effects of Salt on the Crystal Growth and Adhesion Force of Clathrate Hydrates

et al. 2015

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In the offshore oil and gas developments, the problems in relation to hydrate flow assurance are always influenced by the existence of salt in the pipeline systems. Even though the salt effects are essential factors associated with the adhesion force between clathrate hydrate and aqueous solutions, the roles of salt in hydrate adhesion behaviors have rarely been considered. This study aims at understanding the effects of salt on not only the adhesion force variations but also the transformation of hydrate growth morphology. The presence of salt did not profoundly influence the change in the adhesion force of the hydrate probe with surfactant-free solutions, whereas it drastically reduced the adhesion force of the hydrate system with surfactantdissolving aqueous solutions. The experimental results also revealed the inhibition effect of salt on the hydrate crystal growth through the observation of microscopic images. Furthermore, dynamic adhesion behaviors were unprecedentedly captured in terms of gradual increases in adhesion force because of wetting of aqueous solution on the hydrate probe surface and additional hydrate formation. The present work related to the salt effects on the adhesion behaviors could provide novel insights into the dynamic adhesion during the crystal growth of hydrates in the offshore oil and gas production systems.

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“…Zhang et al (2010) reported that addition of a small amount of NaCl (1 mM) into 20 ppm SDS aqueous phase enhances methane hydrate formation. This finding led Salako et al (2012) to extend this research to study the effect of NaCl on the adsorption Figure 2.5: Schematic of surfactant adsorption on clathrate hydrates (Lo et al, 2010a).…”

Section: Surfactantsmentioning

confidence: 97%

“…In the literature additives are mostly divided to two main groups: hydrate inhibitors and promoters. Surface-active agents (Ando et al, 2012;Ganji et al, 2007a,b;Gayet et al, 2005;Lin et al, 2004;Lo et al, 2012a;Okutani et al, 2008;Rogers et al, 2007;Sun et al, 2007;Yoslim and Englezos, 2008;Yoslim et al, 2010;Zhang et al, 2004), salts Masoudi et al, 2005;Paricaud , 2010;Salako et al, 2012;Vu et al, 2002;Zhang et al, 2010), solid particles (Linga et al, 2009a;Park et al, 2006;Prasad et al, 2012;Seo et al, 2005;Seo and Kang, 2010) and other additives (Heidaryan et al, 2010;Kelland , 2006) have been used to slow or accelerate hydrate formation. Understanding the effect of additives on the formation of hydrates and developing a conceptual picture of hydrate formation in the presence of additives is the main focus of the current PhD study.…”

Section: Effect Of Additives On Hydrate Formationmentioning

confidence: 99%

“…More recently, infrared spectroscopy was employed to understand the water structure changes upon adding sodium dodecyl sulphate to the cyclopentane hydrate/water interface (Lo et al, 2012a). In situ surface (zeta) potential measurement has also been applied to support the adsorption mechanism proposed (Salako et al, 2012). It is believed that the liquid water surface and water molecule ordering at the surface and bulk play a significant role in the hydrate formation process.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of the formation of CO2 hydrates in the presence of sodium halides and hydrophobic fumed silica nanoparticles

Farhang¹

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CO 2 capture by trapping the greenhouse gas in clathrates hydrates is proving to be one of the promising options for long term carbon storage. This technology is desirable as it can be deposited in the deep ocean where the suitable pressure and temperature is ready without any extra cost. To date, this method has mostly been of academic interest because the formation of gas hydrates is very slow and requires lots of energy and resources. It is important therefore to develop an efficient and economical process to be able to apply this method at an industrial scale. Scientists and researchers have been looking for suitable additives to accelerate the formation of CO 2 hydrate. To meet these objectives numerous additives have previously been tested and several were found to be suitable hydrate promoters. The mechanism for the formation of gas hydrates in the presence of additives is not clear yet. Understanding this mechanism would help us to select and synthesise the most suitable and cost effective additive.In this thesis, two groups of chemicals i.e. salt and hydrophobic particles were added to the hydrate formation reactor and examined. Initially sodium halides were tested for their effect on the kinetics of the formation of CO 2 hydrates in an isochoric system. The effect of different anion types and concentrations was investigated by directly measuring pressure and temperature changes in the reactor and evaluating maximum CO 2 uptake, conversion, storage capacity, induction time, and hydrate growth rate. The results indicated that sodium halides at a concentration of 50 mM (mmol/L) increase CO 2 consumption and conversion to hydrates. In addition, sodium iodide and sodium bromide in a range of concentrations between 50 and 250 mM significantly increased the hydrate formation kinetics. Measurements of the surface potential of CO 2 hydrates formed in the presence of sodium halides showed negative charge on hydrates with the highest zeta potential observed at the concentration of 50 mM. The findings of this part of the research led us to propose a mechanism for the formation of CO 2 hydrates in the presence of sodium halides.The second group of additives extensively investigated in the current research were hydrophobic nano-particles. Two types of hydrophobic fumed silica were studied.iii They produced two types of particle stabilised systems when mixed with water (i.e. silica foam and dry water). The influence of particle hydrophobicity and concentration on hydrate formation kinetics was established by monitoring gas consumption, CO 2 conversion and induction time. The morphology, microstructure, and pore characteristics were elucidated by cryogenic scanning electron microscopy (cryo-SEM), and the elemental distribution and composition were determined by X-ray energy dispersive spectroscopy (EDS). The results indicated that the promoting effect of hydrophobic fumed silica was dependent on the particle hydrophobicity and on the weight ratio of silica to water. The kinetics of CO 2 hydrate formation were ...

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Adsorption of sodium dodecyl sulfate onto clathrate hydrates in the presence of salt

Cited by 18 publications

References 20 publications

Discovery of a Novel Cationic Surfactant: Tributyltetradecyl-Phosphonium Chloride for Iron Ore Flotation: From Prediction to Experimental Verification

Discovery of a Novel Cationic Surfactant: Tributyltetradecyl-Phosphonium Chloride for Iron Ore Flotation: From Prediction to Experimental Verification

Effects of Salt on the Crystal Growth and Adhesion Force of Clathrate Hydrates

Kinetics of the formation of CO2 hydrates in the presence of sodium halides and hydrophobic fumed silica nanoparticles

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