Solubility of n-alkanes in supercritical CO2 at diverse temperature and pressure

Shi, Qingzhao; Jing, Lishuai; Qiao, Weihong

doi:10.1016/j.jcou.2014.12.002

Cited by 47 publications

(27 citation statements)

References 35 publications

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“…37 The density of CO 2 is obtained from the NIST (National Institute of Standards and Technology) fluid property database. Here, the solubility refers to the maximum mass percentage of the dissolved surfactant in CO 2 at a certain temperature.…”

Section: Methodsmentioning

confidence: 99%

Solubility of Nonionic Hydrocarbon Surfactants with Different Hydrophobic Tails in Supercritical CO₂

et al. 2015

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The experiment utilizes a high-pressure view chamber that mainly aims at identifying the effect of surfactant architecture on solubility in CO 2 . First, when solubility pressures of three series of nonionic hydrocarbon surfactants are measured, results reveal that surfactants with a methylated tail exhibit the best solubility. Unexpectedly, surfactants with a branched tail show worse solubility than linear surfactants. This is conjectured to be caused by attractive molecule−molecule interactions. TX45 that possesses the shortest ethylene oxide chain and a highly methylated tail performs the best in CO 2 solubility. Additionally, the experimental study on the solubility of TX45 in CO 2 at T = (318 to 343) K demonstrates that solubility has a direct correlation with pressure and CO 2 density, while it is inversely related to temperature. Finally, when we look at effects of the added alcohols on surfactant TX45 solubility, the results indicate that hexanol is the most effective alcohol in enhancing solubility. The reason is assumed to be that hexanol molecules could insert themselves between surfactant tails and hinder molecule−molecule interactions.

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Section: Methodsmentioning

confidence: 99%

Solubility of Nonionic Hydrocarbon Surfactants with Different Hydrophobic Tails in Supercritical CO₂

et al. 2015

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“…Similarly, the dissolution pressure of octacosane with the addition of n ‐C 18 H 37 OH was 14.77 MPa, which was lower than that with the addition of n ‐C 18 H 38 (14.85 MPa). In this case, despite the presence of the hydroxyl group in the molecule being unfavorable with respect to the solubility in scCO 2 (the experimentally determined dissolution pressures of 0.001 mol% n ‐C 16 H 34 and n ‐C 16 H 33 OH in scCO 2 at 318 K were 10.34 and 10.78 MPa, respectively; solubility values of n ‐C 16 H 34 and n ‐C 18 H 38 from the experiment and references [Eustaquio‐Rincón & Trejo, ; Shi, Jing, & Qiao, ] are shown in Fig. ), this surfactant showed a better effect on reducing the solubility of octacosane.…”

Section: Resultsmentioning

confidence: 78%

“…Octacosane was used as a heavy hydrocarbon. Our previous research showed that short‐chain alkanes are easier to dissolve in scCO 2 (Shi, Jing, & Qiao, ). If the solute is highly soluble, then it is unfavorable for the surfactants to demonstrate their ability to improve solubility.…”

Section: Resultsmentioning

confidence: 99%

Structural Effects of Nonionic Surfactants on Their Ability to Reduce the Dissolution Pressures of Heavy Hydrocarbons in Supercritical CO₂

Shi

Cheng

Liu³

et al. 2018

J Surfact & Detergents

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The effects of selected nonionic surfactants on dissolution pressures of the octacosane and hydrocarbon mixtures in supercritical CO2 (scCO2) were investigated at 318–343 K to study relationships between the structures of the surfactants and their ability to improve solubility. Dissolution pressures of the solutes were experimentally observed to be decreased by at most 11.10% and at least 0.44% in the presence of the surfactants. However, this solubility‐improving performance was diminished with an increase in the molecular chain length of the surfactant. Linear surfactants gave better solubility‐improving performances in the octacosane/scCO2 systems, while branched compounds were better in the hydrocarbon mixture/scCO2 systems, which are attributed to the similarity of the chain length between the surfactant and the solute. X‐ray computed tomography tests provided evidence for direct material exchange between the hydrocarbon mixture and scCO2.

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“…In consideration of the difficulty of direct solubility parameter measurements in the laboratory, the measured solubility data from the literature are used to compare with and validate the general patterns of calculated results. Figure 2 shows the measured solubility 45,46 and calculated differences of solubility parameters from the developed model for the binary CO 2 –C 8 and N 2 –C 8 mixtures in bulk phase at different temperatures. First, it is found from the figure that the solubility of the CO 2 and N 2 in liquid C 8 is decreased with the temperature and the same pattern is also demonstrated for the calculated solubility parameter differences.…”

Section: Resultsmentioning

confidence: 99%

“…Measured solubility 45,46 and calculated solubility parameter differences of the binary CO 2 –C 8 and N 2 –C 8 mixtures in bulk phase at different temperatures [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

Quantitative distinction of thermodynamic soluble and miscible states

2020

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Soluble and miscible states are two important thermodynamic states in academic research and practical applications but their quantitative distinctions are still fuzzy. In this study, for the first time, the mathematical formulations of the quantitative criteria for distinguishing the thermodynamic soluble and miscible states are analytically developed by means of the Flory-Huggins solution theory and solubility parameter. The quantitative bottom and upper solubility limits for a total of 13 binary and ternary mixtures are calculated at different conditions. Moreover, the composition, temperature and pore radius are specifically studied to evaluate their effects on the soluble and miscible states. On the basis of the work from this study, the insoluble, soluble but immiscible, and miscible states are definitively quantified and clearly distinguished for the first time. K E Y W O R D S Flory-Huggins solution theory, miscible state, quantitative distinction, solubility parameter, soluble state, thermodynamics

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Solubility of n-alkanes in supercritical CO2 at diverse temperature and pressure

Cited by 47 publications

References 35 publications

Solubility of Nonionic Hydrocarbon Surfactants with Different Hydrophobic Tails in Supercritical CO₂

Solubility of Nonionic Hydrocarbon Surfactants with Different Hydrophobic Tails in Supercritical CO₂

Structural Effects of Nonionic Surfactants on Their Ability to Reduce the Dissolution Pressures of Heavy Hydrocarbons in Supercritical CO₂

Quantitative distinction of thermodynamic soluble and miscible states

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Solubility of n-alkanes in supercritical CO2 at diverse temperature and pressure

Cited by 47 publications

References 35 publications

Solubility of Nonionic Hydrocarbon Surfactants with Different Hydrophobic Tails in Supercritical CO2

Solubility of Nonionic Hydrocarbon Surfactants with Different Hydrophobic Tails in Supercritical CO2

Structural Effects of Nonionic Surfactants on Their Ability to Reduce the Dissolution Pressures of Heavy Hydrocarbons in Supercritical CO2

Quantitative distinction of thermodynamic soluble and miscible states

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Product

Resources

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Solubility of Nonionic Hydrocarbon Surfactants with Different Hydrophobic Tails in Supercritical CO₂

Solubility of Nonionic Hydrocarbon Surfactants with Different Hydrophobic Tails in Supercritical CO₂

Structural Effects of Nonionic Surfactants on Their Ability to Reduce the Dissolution Pressures of Heavy Hydrocarbons in Supercritical CO₂