FLUID PHASE EQUILIBRIA
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2020
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IF 2.838
Jinbei Yang,Shucui Han,Qiuju Xu,Meiqiong Yu
The density and viscosity of pure liquid 2, 4-dichlorofluorobenzene and 2, 6-dichlorofluorobenzene were measured in the temperature range of (318.15–348.15) K at the local atmospheric pressure of 99.8 kPa. The saturated vapor pressures of pure 2, 4-dichlorofluorobenzene and 2, 6-dichlorofluorobenzene and the isobaric vapor-liquid equilibria (VLE) data for the 2, 4-dichlorofluorobenzene + 2, 6-dichlorofluorobenzene binary system at atmospheric pressure were determined experimentally by a modified Rose still. The density values were accurately described by DIPPR equation. The viscosity data were well correlated using the Litovitz, Ghatee and VFT, and Andrade equations, and the VFT equation shows the best accuracy. Both Antoine and Riedel equations can well describe the relationship between saturated vapor pressure and temperature, which meet the requirements of engineering design. The Riedel equation is more accurate due to the lower average relative deviation. The VLE data were successfully correlated with NRTL and Wilson activity coefficient models, and the interaction parameters were obtained. The result indicates that there is no azeotrope in the binary mixture. The above thermodynamic properties of pure component and the VLE data presented are crucial for the design and operation of distillation for the isomeric mixture separation of 2, 4-dichlorofluorobenzene + 2, 6-dichlorofluorobenzene.
研究领域:
化学工程
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热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2020
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IF 2.369
Yaqi Ding,Neng Gao,Yongping Wu,Yongmei Xuan,Guangming Chen
Calcium chloride (CaCl2) aqueous solution as a liquid desiccant has the disadvantage of low vapor pressure and easy crystallization. Ionic liquids (ILs) such as [Emim]Cl, [Emim]Ac, and [Emim]Br have been verified to have a good ability to reduce the vapor pressure. In this paper, the vapor pressures of four kinds of CaCl2 + ILs + H2O were measured, which were CaCl2 + [Emim]Br + H2O (mass ratio CaCl2/[Emim]Br = 2:1) at temperatures of between 311.10 and 394.45 K, CaCl2 + [Emim]Cl + H2O (mass ratio CaCl2/[Emim]Cl = 2:1) at temperatures of between 306.58 and 393.89 K, CaCl2 + [Emim]Ac + H2O (mass ratio CaCl2/[Emim]Ac = 2:1) at temperatures of between 304.93 and 382.71 K, and CaCl2 + [Emim]NO3 + H2O (mass ratio CaCl2/[Emim]NO3 = 2:1) at temperatures of between 312.46 and 391.80 K, with the mass fraction of solute ranging from 0.2 to 0.5. The Antonie-type equation was used to fit the measured results. The average absolute relative deviation (AARD %) values of the measured vapor pressures and calculated vapor pressures were 0.52, 0.40, 0.33, and 0.27%, which showed good consistency and accuracy. Comparing the vapor pressures of the different solutions at the same concentration, the following order of the four anions with the ability to reduce the vapor pressure of CaCl2 + H2O can be drawn at a mass fraction of 0.4: Br– > Cl– > NO3– > Ac–.
研究领域:
化学工程
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热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2021
·
IF 2.694
Yongmei Xuan,Bosheng Duan,Kaile Fang,Yaqi Ding,Neng Gao,Guangming Chen
The vapor pressure properties of ionic liquids (ILs) 1-ethyl-3-methylmidazolium iodide ([Emim]I) and 1,3-dimethylimidazolium iodide ([Dmim]I) as absorbent species in lithium chloride aqueous solution (LiCl/H2O) are experimentally investigated. The vapor pressure data of ternary IL mixtures, LiCl + [Emim]I + H2O (mass ratio LiCl/[Emim]I = 3) from a temperature of 338.26–419.83 K at three mass fractions of the absorbent (0.3, 0.4, and 0.5) and LiCl + [Dmim]I + H2O (mass ratio LiCl/[Dmim]I = 3) from a temperature of 354.54–427.23 K at four mass fractions of the absorbent (0.3, 0.4, 0.5, and 0.54), were measured and reported using the boiling point method. The Antoine-type equation was used to fit the experimental data. The average absolute relative deviation (AARD%) values of the experimental data and the calculation results were 0.416 and 0.515%, respectively. By comparing the measured vapor pressure data with a binary mixture (LiCl + H2O), the ternary system of lithium bromide aqueous solution and the same IL (LiBr + ILs + H2O), and ternary mixtures of lithium chloride and ILs of the same organic cation (LiCl + ILs + H2O), it was found that, under experimental conditions, the order of vapor pressures of the proposed ternary systems is LiCl + [Dmim]I + H2O < LiCl + [Emim]Cl + H2O < LiCl + H2O, LiCl + [Emim]I + H2O < LiBr + [Emim]I + H2O, LiCl + [Dmim]I + H2O < LiBr + [Dmim]I + H2O, LiCl + [Emim]I + H2O < LiCl + [Emim]Cl + H2O < LiCl + [Emim]Br + H2O, and LiCl + [Dmim]I + H2O < LiCl + [Dmim]DMP + H2O < LiCl + [Dmim]Cl + H2O < LiCl + [Dmim]BF4 + H2O.
研究领域:
化学工程
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热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
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IF 2.196
Xiangyu Zhang,Neng Gao,Yongping Wu,Guangming Chen
To improve the performance of an absorption system, ionic liquids (ILs) have been chosen as additives to conventional working fluid (lithium bromide aqueous solution) in recent years. In this paper, 1-ethyl-3-methylimidazolium acetate ([Emim]Ac) was added to lithium bromide aqueous solution (mass ratio LiBr/[Emim]Ac = 3) to measure the vapor–liquid equilibrium (VLE) data of the ternary system. The experiment was conducted by means of boiling point method, at temperatures between 303.94 K and 405.41 K and mass fractions of absorbent between 0.20 and 0.60. The experimental data were regressed using an Antoine-type equation, and the average absolute relative deviation (AARD%) between the experimental and calculated values was 0.34%, which showed excellent accuracy and consistency. The experimental ternary system was compared with the conventional LiBr + H2O system and two other ternary systems from the literature; the result revealed that the experimental ternary system had lower vapor pressures, which will benefit the process of releasing latent heat in absorption cycles.
研究领域:
化学工程
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热力学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2020
·
IF 2.369
Yongmei Xuan,Kaile Fang,Bosheng Duan,Neng Gao,Guangming Chen
Ionic liquids (ILs), 1-ethyl-3-methylimidazolium iodine [Emim]I and 1,3-dimethylimidazolium iodine [Dmim]I, were proposed as a novel potential solvent in traditional bromide aqueous solution (H2O + LiBr) in absorption refrigeration cycles. The vapor pressure data of two ternary systems H2O + LiBr + [Emim]I (mass ratio LiBr/[Emim]I = 4) at temperatures from 350.78 to 414.19 K and H2O + LiBr + [Dmim]I (mass ratio LiBr/[Dmim]I = 2) at temperatures from 350.69 to 409.63 K were reported by the boiling point method. The absorbent mass fractions are from 0.30 to 0.57 and 0.30 to 0.60, respectively. The measured data were correlated by using the Antoine-type equation, and the average absolute relative deviation (AARD %) between measured data and regression data was 0.54 and 0.39%. Compared with the vapor pressures of IL mixtures with the same organic cation, the vapor pressure order is LiBr + [Emim]I + H2O < LiBr + [Emim]Cl + H2O < LiBr + [Emim]Ac + H2O and LiBr + [Dmim]I + H2O < LiBr + [Dmim]Cl + H2O < LiBr + [Dmim]BF4 + H2O. Under experimental conditions, the hydrophilic properties of the iodine anion (I–) are better than those of the chlorine anion (Cl–), acetate anion (Ac–), and tetrafluoroborate anion (BF4–). Lower vapor pressure means stronger moisture absorption property. The proposed ternary mixtures have lower vapor pressures and can improve the absorption effect of the absorption system.
研究领域:
化学工程
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热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
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IF 2.298
Yongmei Xuan,Xianyu Ding,Neng Gao,Yaqi Ding,Xin Meng,Guangming Chen
1-Ethyl-3-methylimidazolium chlorine ([Emim]Cl) and 1-ethyl-3-methylimidazolium bromide ([Emim]Br) as an additive to working fluid [lithium bromide aqueous solution (H2O/LiBr) and lithium chloride aqueous solution (H2O/LiCl)] of absorption cycles were proposed. The vapor pressure of H2O + LiCl + [Emim]Cl (mass ratio LiCl/[Emim]Cl = 2) in the temperature from 314.79 to 435.48 K, H2O + LiCl + [Emim]Br (mass ratio LiCl/[Emim]Br = 2) in the temperature from 317.62 to 431.27 K, and H2O + LiBr + [Emim]Cl (mass ratio LiBr/[Emim]Cl = 2) in the temperature from 303.10 to 409.91 K was measured by the boiling point method. The mass fractions of the absorbent were from 0.30 to 0.60. The experimental data were regressed using the Antoine-type equation, and the average absolute relative deviation (AARD %) between the experimental data and calculated values of three systems was 0.44, 0.51, and 0.54%. Compared with that of the previously reported ionic liquids, ([Emim]Ac) as an absorbent for LiBr + H2O, vapor pressure of these four systems follows the order LiCl + [Emim]Cl + H2O < LiCl + [Emim]Br + H2O < LiBr + [Emim]Cl + H2O < LiBr + [Emim]Ac + H2O. The proposed ternary systems have better water affinity and can be promising alternative working fluids in the absorption cooling system.
研究领域:
化学工程
·
热力学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2014
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IF 2.045
Xizhuo Jiang,Wenjie Xiong,Yun Li,Danxing Zheng,Xiao Wang,Lin Shi
This research introduced two new absorption working pairs which have better energy storage performance than LiBr + H2O and lower cost than other working pairs in literature. The two working pairs are both quaternary systems: LiBr + LiNO3 + LiCl + H2O and LiBr + LiCl + 1,3-propanediol + H2O. Vapor pressures of the two quaternary systems were measured with the boiling point method at temperatures from (318.07 to 443.02) K and (324.78 to 419.40) K, respectively, with the both mass fractions of absorbent species from 0.40 to 0.65. The experimental data agree well with the calculated data from the Antoine-type equation. Compared with traditional working fluids of absorption cycle and ionic liquids, results show that the two quaternary systems studied in this work have lower vapor pressures, which will benefit energy release process in absorption energy storage/release systems.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Refrigeration
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2017
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IF 2.779
Zhong Lan,Xuehu Ma,Zhaolong Hao,Rui Jiang
This work mainly focuses on the determination of the saturated vapor pressure of LiBr aqueous solution with mass fraction ranging from 43.14 to 65.26 wt% at high temperature experimentally. First, the measurement of the saturation vapor pressures is conducted in deionized water as well as in LiBr aqueous solution at a lower temperature. The experimental result has a good agreement with the literature value, which verified the reliability and accuracy of the experimental apparatus. Second, measurement of the saturated vapor pressure of LiBr aqueous solution with mass fraction ranging from 43.14 to 65.26 wt% is systematically carried out in the 156.06~257.84 °C temperature range. Based on the saturated vapor pressure data at lower temperature, a correlation for predicting the saturated vapor pressure data of the LiBr aqueous solution is obtained, which is also available for high temperature condition. Therefore, this work will be very helpful for the modeling and design of high temperature LiBr/H 2 O absorption heat transformers.
研究领域:
化学工程
·
热力学
✓ 已验证
DOI
高影响因子
FOOD HYDROCOLLOIDS
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2023
·
IF 10.7
Yuanyuan Chen,Xinshuai Zhang,Sha Li,Ding An,Hongshan Liang,Bin Li,Jing Li
The heterogeneous hygrothermal degradation (HHTD) method can simply and efficiently prepare depolymerized konjac glucomannan (KGM). The degradation rate was significantly improved when the KGM powder moisture was below 20%, but basically no longer increased after the moisture was above 20%. This study systematically examined the influence of the initial moisture content of powder on the molecular structure of KGM and the vapor pressure of degradation system to elucidate the association of these changes with hygrothermal degradation. The results indicated that with the increase of powder moisture, the disorder of KGM amorphous region increased dramatically, and the ordering degree of aggregate structure decreased. Water notably enhanced the freedom of KGM molecular chain motion by reducing the intermolecular hydrogen bond interaction and expanding the free volume. Furthermore, powder moisture markedly promoted the degradation of KGM by increasing the vapor pressure and mass transfer rate of the closed degradation system. The system reached saturated vapor pressure when the moisture content was above 20%. Consequently, the synergistic effect of the water-induced changes in KGM molecular structure and system vapor pressure significantly accelerated the hygrothermal degradation rate of KGM. The promotion effect of powder moisture on degradation reached the upper limit when the moisture content was higher than 20%, thus moderately solvated KGM-20% powder can achieve an efficient hygrothermal degradation effect. This work is expected to provide theoretical bases for the industrial application of HHTD as a controllable and efficient degradation method of KGM.
研究领域:
食品科学
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生物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Yufan Yang,Muran He,Yichan Zhang,Chunting Zhou,Chunhuan Luo
The cis-1-chloro-3,3,3-trifluoropropene (R1233zd(Z)) and tetraethylene glycol dimethyl ether (TEGDME) system has been proposed in this study as a potential alternative absorption working pair. The vapor pressure, density, viscosity, and specific heat capacity of the R1233zd(Z)/TEGDME system were measured systematically. The mixing enthalpy and specific enthalpy were calculated by the NRTL model. Regression equations for the measured values were obtained by a least-squares method. Compared with the LiBr/H2O system, the generation temperature of the R1233zd(Z)/TEGDME system is reduced by 12 °C and the viscosity by about 50%. R1233zd(Z)/TEGDME has strong practical application significance in the absorption heat pump system.
研究领域:
化学工程
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热力学
·
制冷技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2020
·
IF 8.247
Meisheng Han,Yongbiao Mu,Fu Yuan,Xuedong Bai,Jie Yu
To date, development of a lithium-ion battery anode with high capacity, long cycling life over ten thousands of cycles, and fast lithium ion storage within a few seconds for each cycle is still a challenge. Here, a highly mesoporous TiO 2 /C nanocomposite consisting of ultrathin carbon layers tightly coating on the surface of anatase TiO 2 nanocrystals with an average size of 20 nm via interfacial chemical bonds of Ti-O-C is obtained by a simple and facile vapor pressure-assisted synthesis route that pyrolysis of the solution of tetrabutyl orthotitanate tetramer dissolved in ethanol in a sealed vessel. As anode for lithium ion battery , the TiO 2 /C nanocomposite shows a reversible capacity of 630.3 mAh g −1 at 0.5C after 400 cycles, which is unprecedent for the ever reported TiO 2 /C electrode at similar cycle number. Besides, the TiO 2 /C nanocomposite also exhibits ultralong cycling lifetime (over 10000 cycles without capacity loss at 120C) and ultrahigh rate capability (20.5 mAh g −1 at 144C). The outstanding lithium ion storage performances are ascribed to its unique structures, i.e., ultrathin carbon coating, ultrasmall TiO 2 particles, the formation of interfacial chemical bonds of Ti-O-C, and highly mesoporous structure.
研究领域:
材料科学
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能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）