The Relationship Between the Retention Value and Carbon Number of Homologues in Supercritical Fluid Chromatography

Wang, Fuan; Yuanli, Jiang; Jiang, DengGao; Wang, Wenchang

doi:10.1093/chromsci/33.2.71

Cited by 13 publications

(11 citation statements)

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“…(1) and (2) gives: According to a pseudo-chemical reaction process [21], P 1 and P 2 can be expressed as:…”

Section: Molecular Thermodynamic Modelmentioning

confidence: 99%

“…2 also presents the refractive indices that are calculated from the mole fraction, x, of chromium trioxide in the CPDW quaternary solution at different temperatures and different values of m k according to Eqs. (20)(21)(22). From comparison of the data calculated by the model with the experimental data, the total standard deviation of the 240 data points for the eight systems is 1.69 · 10 -4 .…”

Section: Model Parametersmentioning

confidence: 99%

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Measurement and Modeling of Refractive Indices for Multicomponent Chromium Compound Solutions

Wang

Zhang

et al. 2008

Chem Eng & Technol

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The aim of this work is to solve the key problems of the green production process for chromium trioxide and to study the thermodynamic properties of corresponding solutions. The refractive indices of quaternary mixtures (chromium trioxide + potassium chromate + potassium dichromate + water) have been measured from 298.15-333.15 K. A molecular thermodynamic model of refractive indices for aqueous solutions of chromium compounds is proposed, based on the author's molecular model for solution structure and an equation for the excess enthalpy of a binary solution obtained from the experimental measurements. The model parameters are confirmed and quantitative equations for the variation of the model parameters with temperature and the molality of potassium dichromate in the mixed solvent are established. The data predicted by the model are in good agreement with the experimental results.

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“…(1) and (2) gives: According to a pseudo-chemical reaction process [21], P 1 and P 2 can be expressed as:…”

Section: Molecular Thermodynamic Modelmentioning

confidence: 99%

Section: Model Parametersmentioning

confidence: 99%

Measurement and Modeling of Refractive Indices for Multicomponent Chromium Compound Solutions

Wang

Zhang

et al. 2008

Chem Eng & Technol

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“…The lack of a change in retention with the carbon number is surprising as many SFC studies have demonstrated that there is a relationship between increasing chain length and hence decreasing volatility and increasing retention times. This effect has been modelled using data for polyaromatic hydrocarbons on a number of capillary and packed columns [20]. However, as noted in our previous studies on alkyl aryl ketones, phenylalkanols and acids [14,15] the retention of polar analytes on a polar column was also influenced by a normal-phase interaction.…”

Section: Resultsmentioning

confidence: 93%

High resolution packed column supercritical fluid chromatography of fatty acid methyl esters

Smith¹,

Hyytiäinen

Felipe

et al. 2001

J. Sep. Science

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A wide range of methyl esters of saturated and unsaturated fatty acids from C16 to C24 has been separated by supercritical fluid chromatography on a packed silica column. The retention times were primarily dependent on the number of double bonds and the chain length of the parent acid had a negligible influence. The efficiency and resolution of cis‐ and trans‐isomers of C18 and C22 esters were examined on linked columns from 25 to 175 cm overall length. Improvements were obtained up to 125 cm but the effects were limited by increases in the back pressure.

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“…With the development of thermodynamics theory and calculating software technology in recent years, more and more solubility models have emerged. − There are modified Apelblat model, , Van’t Hoff model, , λh model, , Wilson model, , nonrandom two-liquid (NRTL) model, , Jouyban–Acree model, , Combination model of Apelblat–Jouyban–Acree, ,, Combination model of Van't Hoff–Jouyban–Acree ,, and so on. In this work, the modified Apelblat model and Van’t Hoff model were used to simulate solubility data in pure solvents, and the modified Apelblat model, Apelblat–Jouyban–Acree model, and Van’t Hoff–Jouyban–Acree model were adopted to correlate solubility data in mixtures of solvents.…”

Section: Methodsmentioning

confidence: 99%

Solubility Measurement and Correlation of Doxycycline Hyclate in 10 Pure Solvents and Mixtures Solvents at 278.15–323.15 K

et al. 2020

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The solid−liquid phase equilibrium solubility of doxycycline hyclate (DH) in 10 pure organic solvents and cosolvent mixtures DMF (1) + ethanol (2), DMSO (1) + ethanol (2) and acetone (1) + ethanol (2) at a temperature range from 278.15 to 323.15 K was measured and discussed. The results indicated that the experimental mole fraction (x) of DH in 10 neat solvents followed this order: acrylic acid > acetic acid > 1-butanol > 1-pentanol > tetrahydrofuran > isobutyl alcohol > isopropyl alcohol> propanoic acid > acetone > acetonitrile, and temperature affected obviously the solubility especially in acetic acid. Moreover, the experimental mole fraction (x) of DH increased with mass concentration rising of DMF or DMSO in DMF (1) + ethanol (2) or DMSO (1) + ethanol (2), and decreased gradually with mass concentration rising of acetone in acetone (1) + ethanol (2). The experimental solubility in all solvents was correlated better by the modified Apelblat model according to lower values of RAD and RMSD.

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The Relationship Between the Retention Value and Carbon Number of Homologues in Supercritical Fluid Chromatography

Cited by 13 publications

References 0 publications

Measurement and Modeling of Refractive Indices for Multicomponent Chromium Compound Solutions

Measurement and Modeling of Refractive Indices for Multicomponent Chromium Compound Solutions

High resolution packed column supercritical fluid chromatography of fatty acid methyl esters

Solubility Measurement and Correlation of Doxycycline Hyclate in 10 Pure Solvents and Mixtures Solvents at 278.15–323.15 K

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