On the kinetics of dissolution of naphthalene particles in aqueous micellar solutions

Baumgardt, K.; Kahlweit, M.

doi:10.1515/tsd-1980-170308

Cited by 8 publications

(5 citation statements)

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“…The proposed dissolution model assumes that the ratelimiting step of hydrocarbon dissolution is diffusion from the interface into the bulk liquid, which has been confirmed in other studies [31,38,39). At high surfactant concentration, the rate-limiting step in our model is the diffusion of solute-saturated micelles across the hydrodynamic boundary layer.…”

Section: Discussionsupporting

confidence: 64%

“…A mass transfer model used by Baumgardt and Kahlweit [31) assumed that only molecular hydrocarbon diffuses through the hydrodynamic boundary layer into the bulk aqueous phase, which is in equilibrium with the micellar phase (i.e., there is no direct transfer of bulk nonaqueous phase hydrocarbon into micelles). Good agreement between model predictions and experimental data was observed, but surfactant concentrations of only up to three times the cmc were studied.…”

Section: Discussionmentioning

confidence: 99%

“…(i) Phenanthrene molecules dissolve directly into water, which is described by a first-order rate model similar to eq 2 above (28)(29)(30)(31);…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of Phenanthrene Dissolution into Water in the Presence of Nonionic Surfactants

Grimberg¹,

Nagel²,

Aitken³

1995

Environ. Sci. Technol.

124

100

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Section: Discussionsupporting

confidence: 64%

Section: Discussionmentioning

confidence: 99%

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Kinetics of Phenanthrene Dissolution into Water in the Presence of Nonionic Surfactants

Grimberg¹,

Nagel²,

Aitken³

1995

Environ. Sci. Technol.

124

100

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“…Several models describing the kinetics of solid compound dissolution into water in the presence of surfactants have already been presented in the literature ( − ). Chan et al.…”

Section: Introductionmentioning

confidence: 99%

“…Several models describing the kinetics of solid compound dissolution into water in the presence of surfactants have already been presented in the literature (23)(24)(25)(26)(27)(28)(29)(30). Chan et al (26) proposed a detailed model, a schematic of which is described in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Surfactant-Enhanced Dissolution of Phenanthrene into Water for Laminar Flow Conditions

Grimberg

Miller

Aitken

1996

Environ. Sci. Technol.

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The effects of surfactant solutions on processes influencing subsurface remediation are of significant environmental concern. We previously investigated the dissolution of solid phenanthrene into aqueous solutions containing nonionic surfactants in a wellmixed system and developed a mechanistic model to describe the dissolution process. In the present work, we challenged this model by collecting data from a flow-through system in which the hydrodynamics are well defined and provided independent measurements of all parameters in the model. The dissolution process is assumed to be governed by the diffusion of phenanthrene away from the hydrocarbon-water interface in both the aqueous phase and micelles, and transport is formulated in a threedimensional advective-diffusive model. The trends in model predictions and experimental data compare favorably, lending further support to the proposed mechanistic model. In particular, effluent concentrations of phenanthrene from the experimental apparatus were both predicted and observed to be substantially lower than saturation (equilibrium) concentrations, and this difference increased at increasing surfactant concentration over the range of laminar flow rates tested. Better quantitative agreement between the model and experimental data may require a more accurate measurement of the micellar diffusion coefficient or a more complex description of interfacial processes. However, the proposed dissolution model provides an important step toward understanding the influence of surfactants on hydrocarbon dissolution and transport.

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The effect of surfactant structure on the rate of oil solubilization into aqueous surfactant solutions

Bolsman

Veltmaat

1988

J Americ Oil Chem Soc

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Reduced washing temperatures decrease the rate of the various processes in a laundry cleaning cycle. This implies that fast acting detergents are needed if acceptable washing performance is to be maintained within a realistic period of time. An important factor is the rate of oily soil removal which, among other things, is a function of the molecular structure of the surfactants used in the detergent. To support the selection of proper surfactants we have established relationships between chemical structure and rate ofoil solubilization for a series of alkylarenesulfonates with various alkyl chain lengths, points of attachment of the phenyl group at the alkyl chain, and aromatic substitution patterns. It is shown that oil solubilization kinetics are very sensitive to the geometry of the surfactant structure: for a set of isomeric alkylarenesulfonates the rate of oil solubilization can be made to vary by more than an order of magnitude by changing the substitution pattern around the aromatic ring. The results offer a predictive tool for the design of molecules with the proper surface activity under a wide set of experimental conditions.Reduced washing temperatures slow down the various processes involved in the laundry cleaning process. Adjustments of the composition and nature of the surfactant components in laundry products may have to be considered to maintain satisfactory washing performance within a reasonable period of time. An important kinetic aspect of the washing process is the rate of removal of oily stains.Several mechanisms have been proposed for the solubilization of oils into micelles. One mechanism involves dissolution of the solubilizate into the aqueous phase, followed by adsorption onto the micellar surface and subsequent incorporation. This mechanism is advocated by Kahlweit (1), Volkov (2), Arytyunyan (3) and Schwuger (4), although each favors a different step as the rate-limiting one. A second mechanism in essence consists of diffusion of the micelle toward the oil droplet, followed by demicellization, adsorption of monomeric surfactant molecules onto the oil/water interface, incorporation of solubilizate and desorption of the "swollen" micelle. Chan (5) and Carroll (6) support this mechanism. The difference in views about the mechanism of solubilization is not in the least caused by the use of different solubilizates and surfactants. Even more complicated to interpret are data obtained in the presence of a third (solid) phase such as fabrics (7), polyester films (8,9) or aluminum foil (10).This work deals with the relationship between surfactant structure and rate of oil solubilization, using anionic alkylarenesulfonates. The emphasis will be 1Presented at the joint AOCS-Japan Oil Chemists' Society meeting in Honolulu, Hawaii, in May 1986. *To whom correspondence should be addressed. put on phenyl positioning, aromatic substitution pattern and alkyl chain length of the surfactant. Furthermore, the effects of external experimental parameters such as temperature and concentrations will be disc...

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On the kinetics of dissolution of naphthalene particles in aqueous micellar solutions

Cited by 8 publications

References 0 publications

Kinetics of Phenanthrene Dissolution into Water in the Presence of Nonionic Surfactants

Kinetics of Phenanthrene Dissolution into Water in the Presence of Nonionic Surfactants

Surfactant-Enhanced Dissolution of Phenanthrene into Water for Laminar Flow Conditions

The effect of surfactant structure on the rate of oil solubilization into aqueous surfactant solutions

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