Impact of composition on the performance of sodium linear alkylbenzenesulfonate (NaLAS)

Smith, Dewey L.

doi:10.1007/s11746-997-0227-5

Cited by 13 publications

(10 citation statements)

References 6 publications

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“…The effect of the phenyl sulfonate group position on solubility in this study is consistent with previously reported results ascribed to a branched alkyl chain and to a centrally located hydrophilic group (10)(11)(12). For commercial-grade LAS, similar results have been reported by Smith (4).…”

Section: Resultssupporting

confidence: 92%

“…Since the symmetry of C 12 -6-LAS may optimize its inter-and intramolecular hydrophobic interactions, compared to C 12 -5-LAS, this presumably may facilitate micellization and result in a slight reduction in CMC value. This is consistent with the smaller solubility of C 12 -6-LAS compared to C 12 -5-LAS in water, reported by Smith (4). In our work on the molecular interac- tion of mixtures of surfactants, maximum interaction between two surfactants was found for those with the same hydrophobic alkyl chain length (Ref.…”

Section: Resultssupporting

confidence: 92%

“…However, most of these studies used commercial linear alkyl benzene sulfonates that contain many isomers generated in the manu-facture of the raw material, linear alkyl benzene. An extensive study of such commercial isomeric alkyl benzene sulfonates has been reported, and the effect of the isomer distribution on surface properties has been clarified (3,4). To our knowledge, there are very few systematic studies of the properties of pure linear alkyl benzene sulfonates, particularly in hard river water.…”

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confidence: 99%

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Surface properties of linear alkyl benzene sulfonates in hard river water

Zhu

Rosen

Morrall

et al. 1998

J Surfact & Detergents

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Surface properties of a series of highly purified linear alkyl benzene sulfonates were extensively studied in hard river water. The effects of water hardness, alkyl chain length and position of the phenyl sulfonate group in the molecule on such surface properties as pC 20 , critical micelle concentration (CMC), γ CMC , CMC/C 20 ratio, and minimum area per molecule at the interface are discussed in detail. The position of phenyl sulfonate group in the molecule was found to have a pronounced effect on the CMC, γ CMC value, CMC/C 20 ratio, and, to the contrary, a relatively small effect on the pC 20 value. The linear relationship between pC 20 or −log CMC, and m, the number of carbon atoms in the alkyl chain, was found for surfactants with the phenyl sulfonate group either at the terminal position or at the more central position in the molecule. γ CMC decreases but the CMC value increases, when the position of phenyl sulfonate group moves from the terminal toward a more central position of the molecule, reflecting the "Hartley Effect" resulting from the branched alkyl chain. JSD 1, 187-193 (1998). KEY WORDS:Branched-chain effect, critical micellar concentration, hard river water, linear alkyl benzene, linear alkyl benzenesulfonates, relationship of structure and properties in alkyl benzene sulfonates, surface properties.Linear alkyl benzene sulfonate (LAS) is a major ingredient in detergents and other household products. According to recent statistical data, it comprises about 50% of all anionic surfactants used (1). LAS remains the lowest-cost surfactant and recently has received environmental acceptability from the results of Exhaustive Risk Assessment studies conducted by The Netherlands government (2). LAS use is still dramatically increasing in China and other developing countries, and more than 4 × 10 6 tons of LAS (based on the required raw material linear alkyl benzene) are consumed globally every year. To date, many studies have been made on this type of surfactant regarding surface properties and environmental effects. However, most of these studies used commercial linear alkyl benzene sulfonates that contain many isomers generated in the manufacture of the raw material, linear alkyl benzene. An extensive study of such commercial isomeric alkyl benzene sulfonates has been reported, and the effect of the isomer distribution on surface properties has been clarified (3,4). To our knowledge, there are very few systematic studies of the properties of pure linear alkyl benzene sulfonates, particularly in hard river water. The effect of hard river water on surfactant properties is of particular importance in evaluating their environmental effects, since it is in that medium that most of their effects are observed. In the course of a project whose objective was to determine possible relationships between environmental behavior and physicochemical parameters of surfactants (5-7), we have extensively studied the properties of various kinds of highly purified components of widely commercialized surfactants, and have ...

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 92%

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confidence: 99%

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Surface properties of linear alkyl benzene sulfonates in hard river water

Zhu

Rosen

Morrall

et al. 1998

J Surfact & Detergents

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“…51 As shown in Fig. 1a, commercially available NaLAS contains several isomers and it has been previously shown [52][53][54][55][56] that the position of the benzene group, the length of the alkyl chain and differences in molecular area can impact the slope of g vs. concentration curve at lower concentrations, as well as the its value at CMC g CMC . A previous study 55 indicates that isomers with headgroups positioned close to the centre of the alkyl chain tend towards higher g and CMC values.…”

Section: Soft Matter Papermentioning

confidence: 96%

Micellar structure and transformations in sodium alkylbenzenesulfonate (NaLAS) aqueous solutions: effects of concentration, temperature, and salt

et al. 2020

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“…C 12 -2-LAS was spiked from a stock made in methanol, while keeping the amount of solvent in the sediment suspension below 1% of the total volume of the system. C 12 -2-LAS aqueous concentration ranged from 0.02 to 2 mg/L, which are well below the Critical Micelle Concentration (105 mg/L; Smith, 1997). The system was left to equilibrate on a rolling device for 24 h at room temperature (20 AE 1 C).…”

Section: Determination Of the Sorption Coefficientsmentioning

confidence: 99%

Effect of sediment properties on the sorption of C12-2-LAS in marine and estuarine sediments

Rico-Rico

Temara

Behrends

et al. 2009

Environmental Pollution

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Sorption of C 12 -2-LAS to marine sediments mainly depends on both clay and organic carbon content. The importance of each parameter varies with the surfactant concentration. a r t i c l e i n f o a b s t r a c tLinear alkylbenzene sulfonates (LAS) are anionic high production volume surfactants used in the manufacture of cleaning products. Here, we have studied the effect of the characteristics of marine and estuarine sediments on the sorption of LAS. Sorption experiments were performed with single sediment materials (pure clays and sea sand), with sediments treated to reduce their organic carbon content, and with field marine and estuarine sediments. C 12 -2-LAS was used as a model compound. Sorption to the clays montmorillonite and kaolinite resulted in non-linear isotherms very similar for both clays. When reducing the organic content, sorption coefficients decreased proportionally to the fraction removed in fine grain sediments but this was not the case for the sandy sediment. The correlation of the sediment characteristics with the sorption coefficients at different surfactant concentrations showed that at concentrations below 10 mg C 12 -2-LAS/L, the clay content correlated better with sorption, while the organic fraction became more significant at higher concentrations.

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Impact of composition on the performance of sodium linear alkylbenzenesulfonate (NaLAS)

Cited by 13 publications

References 6 publications

Surface properties of linear alkyl benzene sulfonates in hard river water

Surface properties of linear alkyl benzene sulfonates in hard river water

Micellar structure and transformations in sodium alkylbenzenesulfonate (NaLAS) aqueous solutions: effects of concentration, temperature, and salt

Effect of sediment properties on the sorption of C12-2-LAS in marine and estuarine sediments

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