JOURNAL OF MOLECULAR LIQUIDS
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2020
·
IF 5.065
Xiaojie Liu,Chunying Zhu,Taotao Fu,Youguang Ma
The densities and viscosities of ternary solution of piperazine (PZ) + 2-Amino-2-methyl-1-propanol (AMP) + H 2 O were measured at P = 101 kPa and T = (303.15–343.15) K. The effects of temperature and concentration on the density and viscosity of ternary solution were investigated. The apparent molar volume ( V φ ), the limiting partial molar volume ( V φ 0 ), viscosity B -coefficient, Helper's constant and the free energies of activation per mole of solvent ( Δμ 1 0≠ ) and solute ( Δμ 2 0≠ ) were calculated from the density and viscosity, respectively. The solute-solute and solvent-solute interactions were analyzed from the volumetric and viscometric properties. The results show that the PZ has a destructive effect on the structure of mixed solvent.
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ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
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2020
·Vol. 235
·期 4
·451-466
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IF 2.03
Yuli Xue,Yan Zhang,Xiaoling Tan,Wenqing Li,Zhongshu Li,Shaonan Xu,Peng Zhang,Jian Wang,Peiping Zhang,Shiding Miao
It is of importance to reclaim single-salt of potash from Li + -type brines of low concentration. In this work the potassium salts KHCO 3 was efficiently separated from the lithium carbonate-type brines with the aid of CO 2 carbonation. The phase field was provided in which the precipitation of KHCO 3 occurs and single-salt of potassium can be obtained. The low concentration of [Li + ] was also successfully concentrated to a high level (8.1 g/L), and this concentration can be used as sources for Li + -salts production using pre-developed strategies, which looks forward wider applications of the lithium resources of natural brine. This state-of-art was traced via isotherm evaporation on the quaternary system of Li + –K + –CO 3 2− –H 2 O at 298.15 K in which the carbonation steps were performed by CO 2 . Metastable phase diagram was found to consist of three invariant points, seven univariant curves, and four crystallization fields corresponding to Li 2 CO 3 , KHCO 3 , potassium carbonate sesquihydrate (K 2 CO 3 ⋅ 3/2H 2 O), and a potassium carbonate and potassium bicarbonate double salt (K 2 CO 3 ⋅ 2 KHCO 3 ⋅ 1.5H 2 O). There was no crystallization field corresponding to LiHCO 3 . The pH-composition diagram and density-composition diagram were also plotted. This work was carried out in aim of extracting/separating single salts of alkali metals from carbonate-type brines of west China.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2021
·
IF 3.178
Rui-Zhi Cui,Yong-Ming Zhang,Ya-Ping Dong,Wu Li
In this paper, the solubility of unreported systems LiBr–NaBr–Li 2 SO 4 –Na 2 SO 4 –H 2 O, LiBr–KBr–Li 2 SO 4 –K 2 SO 4 –H 2 O and the subsystem LiBr–Li 2 SO 4 –H 2 O was measured by isothermal dissolution method at 298.15 K. Three phase diagrams are also given. It was found that the diagram of LiBr–Li 2 SO 4 –H 2 O system has only one invariant point of LiBr·2H 2 O + Li 2 SO 4 ·H 2 O. The phase diagram of LiBr–NaBr–Li 2 SO 4 –Na 2 SO 4 –H 2 O system includes eight crystallization regions LiBr·2H 2 O, Li 2 SO 4 ·H 2 O, NaBr·2H 2 O, NaBr, Na 2 SO 4 ·10H 2 O, Na 2 SO 4 , Li 2 SO 4 ·3Na 2 SO 4 ·12H 2 O, and Li 2 SO 4 ·Na 2 SO 4 . Five crystallization regions corresponded to two single salts KBr and K 2 SO 4 , two hydrate salts Li 2 SO 4 ·H 2 O and LiBr·2H 2 O, and one double salt Li 2 SO 4 ·K 2 SO 4 in LiBr–KBr–Li 2 SO 4 –K 2 SO 4 –H 2 O system. The relevant Pitzer parameter was obtained and the result predicted by Pitzer model was consistent with the experimental values.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Peng Fang,Jia Wang,Zuoxiang Zeng,Weilan Xue
Liquid–liquid equilibrium (LLE) and solubility data for the quaternary system isopropyl acetate + isopropanol + acetic acid + water and for the ternary systems isopropyl acetate + isopropanol + water and isopropyl acetate + acetic acid + water were studied at 313.15 K under 101.3 kPa. Five quaternary systems with different mole ratios of acetic acid to isopropanol were studied. The Othmer–Tobias and Bachman methods were used to correlate the tie-line data. The experimental LLE data were regressed by the NRTL thermodynamic model, indicating the experimental and the calculated data have a good correlation, with a standard deviation less than 1.42%.
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JOURNAL OF SOLUTION CHEMISTRY
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2019
·Vol. 48
·期 1
·82-103
·
IF 1.039
Jin Jing,Shao Fangjun,Dong Hong,Wu Chuan
Densities and refractive indices are investigated for four binary mixture systems of dimethylvinylethoxysilane with n -heptane, n -octane, n -nonane and n -decane at different temperatures (298.15, 303.15, 308.15, 313.15 and 318.15 K) and atmospheric pressure. From these experimental data, the excess molar volume, isobaric coefficient of thermal expansion, deviation in refractive index, molar refraction, and deviation in the molar refraction have been calculated. The computed quantities have been fitted with the Redlich–Kister equation to derive the coefficients and estimate the standard deviations. The values of the partial excess volume at infinite dilution were calculated using the coefficients of the Redlich–Kister smoothing equation. The effects of composition and temperature on these properties are discussed.
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FOOD HYDROCOLLOIDS
·
2019
·
IF 5.839
Jia-Nan Yan,Wen-Hui Shang,Jun Zhao,Jia-Run Han,Wen-Gang Jin,Hai-Tao Wang,Yi-Nan Du,Hai-Tao Wu,Srinivas Janaswamy,Youling L. Xiong,Bei-Wei Zhu
This article reported the gelation and microstructural properties of scallop male gonads hydrolysates (SMGHs) in the presence of κ-Carrageenan (κ-C) and treated or untreated with potassium chloride (KCl). The presence of κ-C significantly increased the elastic moduli (10.3–449.5 Pa) and melting temperature (32.7–46.7 °C) of SMGHs. The decrease in the relaxation time ( T 21 , T 23 ) signified the strong binding between SMGHs and κ-C. The blue shift in the amide I and II peals coupled with a new band of 1159 cm −1 in SMGHs/κ-C further demonstrated the electrostatic interactions between SMGHs and κ-C. κ-C rose the percentage of β-sheets from 28.10% to 35.93% but at the expense of α-helix and β-turn fractions and highly ebbed the intrinsic fluorescence of SMGHs. Such scenarios resulted in a more compact network formation and flocculation of κ-C chains. The salt-treatment to κ-C promoted helical formation, however, presence of SMGHs created larger interstitial spaces in the κ-C network due to aggregates of SMGHs and decreased the overall gel strength. The outcome promises novel opportunities in the design and development of functional hydrogels based on protein and polysaccharide complexes for food , pharmaceutical and biomedical applications.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
·
IF 2.298
Xing Cui,Hai Zhu,Chao-Hong He,Ke-Jun Wu
The thermal conductivities of 1-butyl-3-methylimidazolium l-tryptophan ([BMIM][l-trp]), water, ethanol, [BMIM][l-trp] + water, [BMIM][l-trp] + ethanol, water + ethanol, and [BMIM][l-trp] + water + ethanol were investigated from 283.15 to 333.15 K covering the whole scale of concentration at atmospheric pressure with the transient hot wire method. The thermal conductivities of pure [BMIM][l-trp] decease linearly from 0.180 to 0.177 W·m–1·K–1 with increasing temperature. The uncertainty of the measurement was less than 2% at the 0.95 confidence level. The experimental data of binary and ternary mixtures were correlated by a second-order Scheffé polynomial as a function of composition and temperature. The average relative deviation of the calculated values with experimental data was 0.58%.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Daofan Ma,Chunying Zhu,Taotao Fu,Xigang Yuan,Youguang Ma
The densities and viscosities of binary mixtures monoethanolamine (MEA) + H 2 O, 2-(Diethylamino)ethanol (DEEA) + H 2 O, MEA + DEEA and ternary mixtures MEA + DEEA + H 2 O were measured over the entire composition at temperatures ranging from (293.15 to 333.15) K and atmospheric pressure. The volumetric and viscometric properties such as excess molar volume, partial molar volume, partial molar volume at infinite dilution, apparent molar volume, viscosity deviation, molar enthalpy, molar entropy and the molar Gibbs energy of activation for viscous flow of mixtures were calculated in terms of experimental data, respectively. Furthermore, excess molar volumes were fitted by the Redlich–Kister equation for binary mixture and by Cibulka equation for ternary solution. The volumetric and viscometric properties were analyzed through the molecular structure and intermolecular interactions.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
·
IF 2.298
Wenyang Fan,Houchun Yan,Xin Huang,Zhaohui Liao,Qingsong Li,Zhanhua Ma
The liquid–liquid equilibrium (LLE) data of ternary systems n-hexane + 1-hexene + solvents (furfural and N,N-dimethylformamide) were determined experimentally at 298.2, 308.2, and 318.2 K under 101.3 kPa. The solvents’ extraction capacity was assessed by the solute distribution coefficient and selectivity. Othmer-Tobias and Hand equations were used to correlate the measured data to test the correlation of the experimental data, which the linear correlation is (R2) ≥ 0.99. Experimental LLE data was correlated utilizing the NRTL and UNIQUAC thermodynamic models with all of the RMSD and AARD values below 0.01 meaning that each ternary system satisfactory agreement at temperatures studied and the NRTL model gives a better agreement than the UNIQUAC model for ternary systems.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Xiaoqiang Gao,Fang Zhang,Yi Yu,Yonghui Dou,Li Xu,Guoji Liu
The solubility of 2-naphthaldehyde (2-NA) and 4-methylphthalic anhydride (4-MA) in ethyl acetate at temperatures from 283.15 to 313.15 K and solid–liquid equilibrium of ternary (2-NA + 4-MA + ethyl acetate) system at temperatures of (288.15, 298.15, and 308.15) K were measured under pressure of 101.3 kPa. Three isothermal phase diagrams were plotted according to the ternary solubility data. For the ternary system, two pure 2-NA and 4-MA solids were formed at each temperature and determined by the wet residue method of Schreinemaker. The crystalline region of 2-NA decreases with the increase in temperature, and 4-MA is just the opposite. The crystallization region of 2-NA was found to be smaller than that of 4-MA. The solubility data of the system were correlated and calculated by NRTL and Wilson models. The results show that the NRTL model agrees well with the experimental data compared with the Wilson model. Furthermore, the densities of equilibrium solutions were determined at the corresponding temperatures.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Shenfeng Yuan,Shengqiao Li,Hong Yin,Zhirong Chen
The experimental liquid–liquid equilibrium (LLE) data of the quaternary systems ethanol + hexanol + decane + water, ethanol + hexanol + undecane + water, ethanol + heptanol + decane + water, and ethanol + heptanol + undecane + water were collected at 298.15 K under atmospheric pressure. The UNIQUAC model was used to regress the quaternary systems and acquire the binary interaction parameter, which was used to predict the LLE data of the six-component system. The predicted LLE data were compared with the experimental data, and the results showed they were in good agreement, which indicated that the binary interaction parameters acquired from the quaternary systems could predict the LLE data of the six-component system. The distribution coefficient and the selectivity showed that 65% ethanol aqueous solution was suitable for separating hexanol and heptanol from the hexanol–heptanol–decane–undecane mixture.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Yongzhao Zhang,Xia Guo,Jian Xu,Yuxiang Wu,Meizhen Lu
Liquid–liquid equilibrium (LLE) data was very important for the process design and optimization of 5-hydroxymethylfurfural (5-HMF) production. To provide this fundamental data, experimental liquid–liquid equilibrium data for ternary systems, {water + 5-HMF + 1-butanol}, {water + 5-HMF + isobutanol}, and {water + 5-HMF + methyl isobutyl ketone}, were measured at 313.15, 323.15, and 333.15 K. Partition coefficients were used to assess the extraction capacity of organic solvents in the biphasic systems. 1-Butanol and isobutanol were desirable extractants with good extraction performance and environmental benign properties. The NRTL model was used to correlate the experimental data and the binary interaction parameters were obtained. The average relative deviation was lower than 10%.
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