JOURNAL OF CHEMICAL THERMODYNAMICS
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2016
·
IF 2.196
Shurui Xu,Shuanshi Fan,Haiyuan Yao,Yanhong Wang,Xuemei Lang,Pingping Lv,Songtian Fang
In this paper, the three-phase coexistence points are generated for multicomponent gas hydrate in methanol (MeOH) solution for (0.05, 0.10, 0.15, and 0.35) mass fraction and ethylene glycol (EG) solution for (0.05, 0.10, 0.15, 0.35, 0.40 and 0.55) mass fraction. The phase equilibrium curves of different system were obtained by an isochoric pressure-search method on high pressure apparatus. The phase equilibrium regions of multicomponent gas hydrate were measured using the same composition of natural gas distributed in the South China Sea. And the different concentration solutions were prepared based formation water. The experimental data were measured in a wide range temperature from 267.74 to 298.53 K and a wide range pressure from 4.22 MPa to 34.72 MPa. The results showed that the hydrate phase equilibrium curves shifted to the inhibition region in accordance with the increased inhibitor concentration. In addition, the equilibrium temperature would decrease about 2.7 K when the concentration of MeOH increased 0.05 mass fraction. Besides, the suppression temperature was 1.25 K with the 0.05 mass fraction increase of EG concentration in the range of 0.05 mass fraction to 0.15 mass fraction. While in high EG concentration region, the suppression temperature was 3.3 K with the same increase of EG concentration (0.05 mass fraction).
研究领域:
化学工程
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热力学
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产品关联
DOI
高影响因子
ELECTROCHEMISTRY
·
2016
·Vol. 84
·期 12
·948-952
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IF 0.791
Xiyun YANG,Ling RAN,Shenghai YANG
Anodic dissolution of zirconium in Bun4NBr-containing n-butanol solutions was investigated using cyclic voltammetry, linear sweep voltammetry and potentiostatic current–time transient and scanning electron microscopy (SEM). Zirconium did not exhibit active dissolution due to passivation in the potential region of 0.2 to 1.2 V vs. SCE. The zirconium dissolution in passive state was under mass transfer control. Pitting corrosion took place as a result of passivity breakdown by Br− anions and the typical steady-state pitting potential was between 1.55–1.60 V vs. SCE in n-butanol solutions containing 0.08 M Bun4NBr. SEM images confirmed the occurrence and the intensification of pits with an increase of potential. Increasing Bun4NBr concentration accelerated the pit nucleation and growth. The reaction order leading to pit nucleation process was 1.0 with respect to bromide anions. The dissolution of zirconium in n-butanol solution produced Zr(OC4H9)4.
研究领域:
电化学
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材料科学
✓ 已验证
DOI
高影响因子
KEY ENGINEERING MATERIALS
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2012
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IF 0
Yang Hou,Ping Hu,Wen Bo Han
The dispersion of SiC nanopowders in ethanol solution was studied by sedimentation test, particle size measurement and TEM analysis. The dispersion behavior of SiC nanopowders in ethanol solution was strongly dependent on the pH values, types and amounts of dispersant. PEI was found to be effective for the dispersion of SiC nanopowders in ethanol solution. With the addition of PEI, the isoelectric points of SiC nanopowders in ethanol solution were at pH 9.5, and shift to pH 12.3. The stability of SiC suspension increased with the dispersant content increasing until reached 2.5 wt% PEI. The suitable pH value for the dispersion of SiC nanopowders should lower than 10.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
FLUID PHASE EQUILIBRIA
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2018
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IF 2.197
Tao Jia,Shengshan Bi,Jiangtao Wu
The solubilities of carbon dioxide , oxygen, and nitrogen in aqueous ethylene glycol(EG) solution with EG mass fraction 0.365 were measured at temperatures from (263–293) K and pressures from (0.009–0.101) MPa based on an isochoric saturation method. A new experimental setup was built and checked by measuring the solubility of carbon dioxide in water. The expanded uncertainty ( k = 2) of the measured solubility data was estimated to be less than 4.0%. The experimental results of carbon dioxide, oxygen, and nitrogen in aqueous EG solution were successfully correlated with a modified Krichevsky–Kasarnovsky equation. The absolute average deviations of the experimental and fitted values were 5.2%, 3.2%, and 2.6%, respectively.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2016
·
IF 1.34
Xi-yun YANG,Hai-qiang HUANG,Sheng-hai YANG
Anodic dissolution behavior of zirconium in Bu n 4 NBr-contaning isopropanol solution was investigated using cyclic voltammetry, linear sweep voltammetry and chronoamperometry, complemented with a scanning electron microscope (SEM). The voltammograms did not exhibit active dissolution until the breakdown of passive layer induced by aggressive bromide anions. SEM images confirmed the existence of pits on zirconium surface. The depth and breadth of pits were intensified with increasing potential. The pitting potential shifted negatively as either temperature or Bu n 4 NBr concentration was increased, while it increased with increasing scan rate. The corrosion current density increased with increasing temperature. The apparent activation energy of anodic dissolution of zirconium was 21.88 kJ/mol. The chronoamperometry revealed that increasing Bu n 4 NBr concentration shortened the incubation time for passivity breakdown and accelerated the pit nucleation and growth. The experimental results were helpful to obtain the optimum conditions for electrosynthesis of zirconium isopropoxide.
研究领域:
材料科学
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电化学工程
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Baofang Zhang,Ziyu Zengcai,Wenting Lin,Wenjie Gu,Dizhou Lou,Ruixi Luo,Qingwei Meng,Yunhong Pi,Tiejun Wang
Herein, Cu 2 O/Ti 3 C 2 T x @TiO 2 is designed by facile one-step strategy of glucose oxidation–reduction reaction for efficient H 2 production from the photothermal-driven reforming of methanol solution (PTRM). At 210 °C, the high H 2 production rate of 87404.0 μmol g cat −1 h −1 (apparent quantum efficiency of 20.6 % at 550 nm) over Cu 2 O/Ti 3 C 2 T x @TiO 2 under photothermal-driven condition is roughly 4 times that of the single thermal condition. The excellent photothermal H 2 yield activity over Cu 2 O/Ti 3 C 2 T x @TiO 2 is attributed to effectively separate carriers and reduced activation energy due to the synergistic effect of light and heat (55.05 kJ·mol −1 ) comparing to pure thermal condition (88.29 kJ·mol −1 ), which led to achieve low-temperature H 2 evolution at 95 °C. Additionally, this work demonstrates the excellent photothermal stability of Cu 2 O/Ti 3 C 2 T x @TiO 2 under without KOH condition (average rate 2383.2 μmol g cat −1 h −1 in 72 h), and a total turnover number (TON) up to 1373.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Jin Quan Tao,Yi Jing Jia,Yan Cui,Tian Yu Bai,Xi Nan Xue,Rong Peng Yao,Ya Song Zhou,Qiang Wei
The synthesis of zeolites through more efficient, environmentally friendly, and cost-effective methods was deemed significant in both industrial applications and academic fields. Conventional hydrothermal synthesis strategies have encountered difficulties in producing pure silica MFI zeolite (silicalite-1) under amine-free conditions. This was primarily attributed to the competitive growth of quartz, keatite, or magadiite during the crystallization process. In this work, it was found that the lack of nucleation ability was an important reason for the poor crystallization stability of the methanol solution. Well-crystallized silicalite-1 zeolites with uniform particle sizes were achieved through the cooperative guidance of methanol and seed crystals. Large-scale experiments with silicalite-1 zeolite demonstrated good reproducibility. Combined with the TG-IR and N2 adsorption–desorption results, it was observed that, when an extremely small amount of seed (0.97 wt %) was introduced, methanol could play a role as a crystallization promoter in the hydrothermal synthesis system. Furthermore, a lower alkaline-to-silica ratio and water-to-silica ratio were conducive to the progression of the crystallization process. In summary, this work presented a hydrothermal synthesis strategy for the synthesis of silicalite-1 zeolite in a methanol solution without the need for a large amount of seeds and provided an effective pathway for the low-cost, large-scale production of silicalite-1 zeolite.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Refrigeration
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2024
·
IF 3.5
Songping Mo,Junhao Chen,Yuxin Yu,Yufen Chen,Lisi Jia,Ying Chen
Using ethylene glycol solution as the base fluid has demonstrated its effectiveness in reducing the freezing point of the continuous phase in phase change emulsions. This, in turn, enhances the stability of the emulsion at low temperatures, which has significant implications for applications requiring emulsions in such conditions. However, there is a notable absence of comprehensive studies on this topic. In this study, we utilized the phase conversion method to prepare hexadecane emulsions with varying mass fractions, using ethylene glycol aqueous solution as the base fluid. The impact of the ratio of hexadecane to surfactant and the formulation of the surfactants on the dispersion stability of the emulsions were systematically investigated and optimized. Furthermore, the phase change and thermal properties of the emulsions were examined. Based on these results, the energy storage capacity and pumping power of the emulsions were calculated and compared with those of the base fluid. The results indicate that as the mass fraction of phase change material (PCM) increases, the energy storage capacity and viscosity of the emulsions also increase, while the thermal conductivity decreases. Additionally, the energy storage capacities of the emulsions surpass that of the base fluid, and the pumping power is reduced at relatively low PCM mass fractions and within the heat storage temperature range. The appropriate mass fraction of PCM were determined by comparing these outcomes.
研究领域:
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2024
·
IF 5.3
Yaoshan Li,Yuan Liu,Yuwei Cao,Huatai Wang,Kaitao Li,Yanjun Lin
In this study, the solubility of anhydrous magnesium sulfate (MgSO 4 ) in ethanol solutions with concentrations ranging from 10 % to 50 % was determined at 15–50 °C. Next, the results were correlated by using the Apelblat model, polynomial empirical equation, ideal solution equation of state model, and Van’t Hoff–Jouyban–Acree model. The results indicated that all four models exhibited correlation coefficients greater than 97 %, and average relative deviations of 3.82 %, 4.24 %, 3.96 %, and 3.96 %, respectively. Notably, the Apelblat model was found to be more accurate and reliable in correlating the solubility of MgSO 4 in ethanol solutions with different concentrations. Further, the Van’t Hoff equation was applied to determine the enthalpy and entropy of dissolution. Herein, a certain amount of anhydrous ethanol was added to the zinc (Zn) electrolytic waste solution (ZEWS) to crystallize Zn 2+ and Mg 2+ through the solvent crystallization method, with the precipitation rates reaching 20.13 % and 39.38 %, respectively. The concentration of Mg 2+ reduced to below 15 g⋅L −1 , meeting the quality standard of ZEWS. The XRD, TG, and SEM analyses of the output salt mix crystallization confirmed the primary components to be MgSO 4 ·7H 2 O and ZnSO 4 ·7H 2 O, with the morphological features primarily consisting of short rods and some crystal agglomerates. This study shows that the removal of Mg 2+ from Zn smelting process can be effectively achieved by the proposed solvent crystallization method.
研究领域:
化学工程
·
环境科学
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DOI
高影响因子
MATERIALS AND MANUFACTURING PROCESSES
·
2016
·
IF 1.419
Ziming Zhu,Xindu Chen,Zefeng Du,Shenneng Huang,Dongyu Peng,Junwei Zheng,Han Wang
Wavy fibers fabricated by electrohydrodynamic jet printing (E-J-P) have been used in many applications, such as sensors, electromechanical systems, stretchable electronics products, and flexible displays. Auxiliary electrodes (A-E) were initially used to control the deposited morphology of the wavy fibers in this study. A polyethylene oxide solution was electrospun with an applied voltage of 1 kV and an alternating current power (ACP) supplied to A-E. The experimental results show that the amplitude can be controlled by the voltage of the ACP, and the generated frequency of the wavy fiber is the same as the frequency of the ACP.
研究领域:
材料科学
·
纳米技术
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Mengjie Chen,Qinlan Luo,Haizhou Lin,Qiang Sun,Hongxia Gao,Sen Liu,Yuanyuan Li,Zhiwu Liang
The kinetic behavior of the reaction of CO 2 with MEA-TREA in ethanol solution was studied using the stopped-flow technique. The results indicate that the zwitterion mechanism successfully correlates the experimentally measured pseudo first-order reaction constant ( k 0 ) and that the TREA participated in the deprotonation step of MEA-zwitterion as an alkaline substance after the formation of MEA-zwitterion. Then, the applicability of this proposed mechanism was investigated by using the reaction kinetics of CO 2 with MEA-DMEA, MEA-DEEA, MEA-MDEA, DEA-TREA, DEA-DMEA blended amines in non-aqueous ethanol solution, as well as MEA-TREA, MEA-DMEA, DEA-TREA, DEA-DMEA blended amines in water-lean solutions. It was found that the mechanism of the reaction of CO 2 with these mixed amines can be expressed by: k 0 = K A - A z [ A ] 2 + K A - B z [ A ] [ B ] + K 1 z [ A ] . The ethanol and water molecules which contribute to K 1 z can be used as proton transfer channels to accelerate proton transfer, but they do not directly participate in the reaction. In addition, the alkalinity and the steric hindrance effect controlled by the molecular structure of tertiary amines affected the reaction rate at the same time. The activation energies in MEA-EtOH and MEA-TREA-EtOH system were estimated by fitting the second-order rate constants to the Arrhenius expression, indicating that TREA can reduce the reaction activation energy and make the reaction more kinetically favorable.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Zhijie Zhu,Juan Tang,Xinxin Ma,Caihong Wang,Chengyi Sun,Yuqing Hu,Zhaoxian He,Xianfeng Du,Xu Chen
This study investigated the effect of different-polarity aqueous ethanol solutions on the formation of V -type starch originating from corn starch. Scanning electron microscopy revealed that the morphology of starch transformed from a random lamellar structure to a granular structure with decreasing solution polarity. When the ethanol concentration increased from 40 % to 60 %, the crystallinity and single-helix ratio of V -type starch increased from 9.66 % and 6.90 % to 29.77 % and 12.84 %, respectively. When the ethanol concentration was 100 %, the aforementioned parameters decreased to 21.31 % and 11.07 %, respectively. The crystallinity and curcumin encapsulation efficiency of the V -type starch reached their maximum values when this starch was prepared using 60 % aqueous ethanol. Furthermore, curcumin release experiments indicated that the produced starch–curcumin complex could resist gastric acid, and V -type starch with higher crystallinity exhibited a better sustained release effect in intestinal fluid. These results indicate that the formation of V -type starch can be finely regulated using aqueous ethanol solutions with different polarities, and such regulation is beneficial for the application of V -type starch in the oral delivery of guest molecules.
研究领域:
食品科学
·
材料科学
·
药物递送
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）