JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Tiantian Ping,Yu Dong,Shufeng Shen
Nonaqueous CO 2 absorbents, composed of secondary alkanolamines and 2-alkoxyethanols, have attracted much attention for an energy-efficient CO 2 capture process. In this work, densities and viscosities of partially CO 2 -loaded mixtures of 2-(butylamino)ethanol (BAE) + 2-butoxyethanol (EGBE) and 2-(ethylamino)ethanol (EAE) + EGBE were measured at atmospheric pressure over the temperature range of (293.15 to 353.15) K with amine mass fraction ( w 1 ) of (0.10, 0.30 and 0.50) containing various CO 2 loading. With increasing CO 2 loadings, significant increases in both density and viscosity were observed. Dimensionless ρ loaded · ρ CO2-free −1 and η loaded · η CO2-free −1 from the CO 2 -free and CO 2 -loaded systems were fitted by proposed correlations as a function of temperature, amine concentration and CO 2 loading. The calculated values of density and viscosity from the correlations are in good agreement with the experimental results, with AADs within 0.15% and 1.60% for density and viscosity respectively. The dramatic increase in viscosity of carbonated solutions was interpreted by the intermolecular interactions and the formation of ionic products in the mixtures based on the FTIR spectral results.
研究领域:
化学工程
·
物理化学
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DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2014
·
IF 2.241
Ye Yuan,Yixin Leng,Hui Shao,Chunxiang Huang,Kai Shan
The solubility of dl -malic acid in water, ethanol and ethanol + water mixtures was investigated by a static analytical technique using the acid–base titration method at temperatures ranging from 298.15 to 333.15 K. The experimental results indicated that the solubility of dl -malic acid in the binary solvent mixtures increases with increasing temperature and decreases with increasing mass fraction of ethanol. The measured solid–liquid equilibrium (SLE) data were correlated by the modified Apelblat, λh and van’t Hoff equations. The calculated solubility demonstrated good agreement with the experimental data. It was found that the modified Apelblat equation could give the best correlation results, and subsequently used to derive the standard enthalpy, entropy and Gibbs energy change of solution of dl -malic acid in ethanol + water binary mixtures.
研究领域:
化学
·
热力学
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2016
·Vol. 29
·期 4
·497-507
·
IF 0.496
Ding Shan,Wei Li-gang,Li Kun-lan,Ma Ying-chong
Binary mixtures of 1,3-dialkylimidazolium based ionic liquids (ILs) and water were selected as solvent systems to investigate the solute-solvent and solvent-solvent interactions on the preferential solvation of solvatochromic indicators at 25 °C. Empirical solvatochromic parameters, dipolarity/polarizability ( π *), hydrogen-bond donor acidity ( α ), hydrogen-bond acceptor basicity ( β ), and Reichardt's polarity parameters ( E N T ) were measured from the ultraviolet-visible spectral shifts of 4-nitroaniline, 4-nitroanisole, and Reichardt's dye. The solvent properties of the IL-water mixtures were found to be influenced by IL type and IL mole fraction ( x IL ). All these studied systems showed the non-ideal behavior. The maximum deviation to ideality for the solvatochromic parameters can be obtained in the x IL range from 0.1 to 0.3. For most of the binary mixtures, the π * values showed the synergistic effects instead of the E N T , α and β values. The observed synergy extent was dependent on the studied systems, such as the dye indicator and IL type. A preferential solvation model was utilized to gather information on the molecular interactions in the mixtures. The dye indicator was preferentially solvated on the following trend: IL>IL-water complex>water.
研究领域:
化学
·
物理化学
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DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2017
·
IF 2.473
Rui Zhao,Miao Yu,Peng-shuai Zhang,Tao Li,Bao-zeng Ren
Capecitabine is a widely used anticancer prodrug of 5-fluorouracil, but up to the present time there is no solubility data reported other than in supercritical carbon dioxide . In this paper, by the polythermal method, the solubility data of capecitabine in fifteen pure lower alcohols and water with methanol mixture solvents were measured from 278.15 K to 323.15 K under atmospheric pressure. The results show that the solubility of capecitabine in linear lower alcohols are bigger than that in corresponding branch chain lower alcohols, and decrease with the increasing of carbons in alkyl of alcohols. Moreover, the solubility of capecitabine increases with the increasing of temperature and mole fraction of methanol in the binary solvent mixtures of water + methanol. To expand industrial application of experimental solubility data of capecitabine in recrystallization, the values measured in selected pure lower alcohols are correlated using the modified Apelblat equation, the Buchowski-Ksiazczak-pletrzyk equation, the van't Hoff equation, the Wilson model and the NRTL model; And for the binary solvent system, the modified Apelblat equation and Jouyban-Acree model are used to correlate the solubility data. By evaluating the deviations between experimental and correlated data, all the correlated data by six models used in this research show comparable precision to those attained by careful experimental measurement. Moreover, some apparent thermodynamic quantities (Δ S d o , Δ H d o , Δ G d o , % ζ H and % ζ TS ) of the dissolution processes of capecitabine in selected solvents and temperature range studied were calculated by the parametric van't Hoff equation. According to the calculation, the dissolution of capecitabine in lower alcohols and water with methanol mixture solvents is an endothermic and entropy-driven process. The solubility and apparent dissolution characteristics of capecitabine in this paper would provide basic support for industrial design and further studies.
研究领域:
药学
·
化学
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DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2013
·
IF 2.379
Yonghong Hu,Wenbiao Zhi,Mengmeng Liang,Zheng Cao,Wenge Yang
In this paper, we focused on solubility and solution thermodynamics of myo -inositol. By gravimetric method, the solubility of myo -inositol was measured in (water + acetic acid) binary solvent mixtures from 278.15 K to 333.15 K under atmosphere pressure. The solubility data were fitted using modified Apelblat equation, a variant of the combined nearly ideal binary solvent/Redich–Kister (CNIBS/R–K) model and Jouyban–Acree model. The three models were all proven to give good agreement with the experiment data, and modified Apelblat equation was the best. By means of van’t Hoff analysis, the enthalpy, entropy and Gibbs energy were calculated, which indicated that the dissolving process was nonspontaneous.
研究领域:
化学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2014
·
IF 5.039
Yantao Wang,Ligang Wei,Kunlan Li,Yingchong Ma,Ningning Ma,Shan Ding,Linlin Wang,Deyang Zhao,Bing Yan,Wenying Wan,Qian Zhang,Xin Wang,Junmei Wang,Hui Li
Lignin dissolution in dialkylimidazolium-based ionic liquid (IL)–water mixtures (40 wt%–100 wt% IL content) at 60 °C was investigated. The IL content and type are found to considerably affect lignin solubility. For the IL–water mixtures except 1-butyl-3-methylimidazolium tetrafluoroborate ([C 4 C 1 im]BF 4 ), the maximum lignin solubility can be achieved at 70 wt% IL content. Lignin solubility in IL–water mixtures with different cations follows the order 1-butyl-3-methylimidazolium ([C 4 C 1 im] + ) > 1-hexyl-3-methylimidazolium ([C 6 C 1 im] + ) > 1-ethyl-3-methylimidazolium ([C 2 C 1 im] + ) > 1-octyl-3-methylimidazolium ([C 8 C 1 im] + ) > 1-butyl-3-ethylimidazolium ([C 4 C 2 im] + ) > 1-butyl-3-propylimidazolium ([C 4 C 3 im] + ). For IL mixtures with different anions, lignin solubility decreases in the following order: methanesulfonate (MeSO 3 − ) > acetate (MeCO 2 − ) > bromide (Br − ) > dibutylphosphate (DBP − ). Evaluation using the theory of Hansen solubility parameter (HSP) is consistent with the experimental results, suggesting that HSP can aid in finding the appropriate range of IL content for IL–water mixtures. However, HSP cannot be used to evaluate the effect of IL type on lignin solubility.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2015
·
IF 4.494
Bing Yan,Kunlan Li,Ligang Wei,Yingchong Ma,Guolin Shao,Deyang Zhao,Wenying Wan,Lili Song
The treatment of enzymatically hydrolyzed lignin (EHL) in dialkylimidazolium-based ionic liquid (IL)–water mixtures (50–100 wt% IL content) was investigated at 150 °C for 3 h. pH, IL type, and IL content were found to greatly influence the degradation of lignin and the structure of regenerated lignin. 1-Butyl-3-methylimidazolium methylsulfonate–water mixtures with low pH facilitated lignin depolymerization but destroyed the regenerated lignin substructure. Regenerated lignin with low molecular weight and narrow polydispersity index (2.2–7.7) was obtained using a 1-butyl-3-methylimidazolium acetate-based system. Water addition inhibited lignin depolymerization at 50–100 wt% IL content, except for 70 wt% 1-butyl-3-methylimidazolium chloride–water mixture. Compared with pure IL treatment, obvious differences were observed in the breakdown of inter-unit linkages and ratio of syringyl to guaiacyl units in regenerated lignin with IL–water treatment.
研究领域:
生物化学
·
材料科学
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DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 60
·55272-55281
·
IF 3.289
Chengyun Gao,Minhua Zhang,Fusheng Pan,Lingtao Wang,Jiayou Liao,Teng Nie,Jing Zhao,Keteng Cao,Lei Zhan,Zhongyi Jiang
In this study, hybrid membranes incorporated with sulfonated carbon molecular sieves were fabricated and utilized for pervaporation dehydration of an acetone/water mixture. First, carbon molecular sieves (CMS) were synthesized via a hard template method, and sulfonated by concentrated H2SO4 to prepare sulfonated carbon molecular sieves (SCMS). The pore structure, surface properties and morphological features of CMS and SCMS were examined by XRD, FT-IR, TEM, EDX, nitrogen adsorption–desorption and HRTEM. The results showed that the obtained CMS had an ordered mesoporous structure with cylindrical channels and large surface area. After sulfonation, the surface properties of CMS changed from hydrophobic to hydrophilic. Then, SCMS with different contents were incorporated into a chitosan (CS) matrix to fabricate CS-SCMS hybrid membranes. The incorporation of SCMS can simultaneously create more water transportation pathways due to the ordered mesoporous structure and increase the number of hydrophilic sites due to the sulfonic acid groups within the membranes. When the content of SCMS was 2 wt%, an optimum separation performance with a separation factor of 832 and a permeation flux of 1.81 kg m−2 h−1 was acquired, which was increased by 2 times for the separation factor and 1.67 times for the permeation flux compared with those of the pure CS membrane. Meanwhile, the hybrid membrane showed good long-term stability.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2016
·
IF 3.847
Chao Zhou,Xiangdong Zhu,Feng Qian,Wei Shen,Hualong Xu,Shicheng Zhang,Jianmin Chen
This work investigated the yields of monomeric phenols in bio-oil derived from hydrothermal liquefaction of rice straw (RS) in water and ethanol mixtures using a reductive CuZnAl catalyst. Based on the results of an initial analysis, five monomeric phenolic compounds were selected for research due to their higher concentrations, namely phenol, 4-ethyl-phenol, 2-methoxy-phenol, 2-methoxy-4-ethyl-phenol and 2,6-dimethoxy-phenol. The optimized conditions for the production of monomeric phenols can be determined as: 2 g of CuZnAl catalyst, a ratio of 50% ethanol/50% water (v/v), a temperature of 300 °C and a reaction time of 30 min. Results suggested that the maximum yield of total monomeric phenols could reach as high as ~ 26.8% (based on the mass of RS lignin), and that the aqueous phase yielded 95.5% of the monomeric phenols due to the solubilization of the ethanol. The CuZnAl catalyst was recycled five times, and a slight loss in activity was observed and examined using a number of technologies, including inductively coupled plasma , X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy and energy dispersive X-ray detection. The low-cost nature of the CuZnAl catalyst makes it an ideal catalyst for the enhancement of monomeric phenols yields in water and ethanol mixtures.
研究领域:
生物化学
·
可再生能源
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产品关联
DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2013
·Vol. 42
·期 9
·1782-1793
·
IF 1.128
Lu Jia,Li Shu’ni,Zhai Quanguo,Jiang Yucheng,Hu Mancheng
The mean activity coefficients for CsCl in N -methylformamide or urea ( w ) + H 2 O (1 − w ) systems were determined in this work by potentiometry, using ion-selective electrodes at 298.15 K. The value of mass fraction w was varied between 0.00 and 0.40 in five unit-steps and the molality of CsCl was between 0.0020 and 1.4009 mol·kg −1 . The experimental data have been correlated with the Pitzer, modified Pitzer and the extended Debye–Hückel equations. The resulting values of the mean activity coefficients, the osmotic coefficients and the standard Gibbs energy of transfer, together with the Pitzer ion-interaction parameters ( β
(0) , β
(1) and C
φ ), extended Debye–Hückel parameters ( a , c and d ), and modified Pitzer parameters ( b , B
MX , C
MX ) are reported for the investigated systems.
研究领域:
化学
·
物理化学
✓ 已验证
DOI
高影响因子
Communications Materials
·
2025
·Vol. 6
·期 1
·1-9
·
IF 9.6
Zhou Qianhui,Li Mingfei,Yu Weiyan,Wang Yunjing,Yang Yujie,Hao Jingcheng,Xu Lu
Achieving homogeneous oil and water mixing requires thorough droplet dispersions of both liquids. An additional component, such as a surfactant, particle, solvent or ion is normally required to stabilize the small liquid droplets by providing sufficiently low interfacial tensions or strong repulsive forces. Here we show that very stable oil-in-water mixtures can be created even at very high oil volume fractions by building multiple, high-strength hydrogen bonding interactions between water and a biocompatible and biodegradable oil trimethylolpropane trioleate, which make the oil molecules at the contact interface behave as pseudo-surfactants with ultrahigh interfacial activity. The resultant oil microdroplets can be reversibly thermosecreted from the continuous aqueous phase and lead to controllable formation/dissociation and switchable lubrication of the binary liquid mixture owing to the inherent thermal responsiveness of the intermolecular hydrogen bonding. Interestingly, although water is uncovered to possess a relatively poor lubricity, the liquid mixture yields an optimized lubrication that is even exceedingly comparable to pure oil at a water volume fraction as high as 80%.
研究领域:
材料科学
·
化学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2017
·
IF 6.337
Xiaoyan Pei,Dazhen Xiong,Jing Fan,Zhiyong Li,Huiyong Wang,Jianji Wang
In recent years, carbon nanodots (CDs) have attracted increasing attention in many applications because of their superior optical and chemical properties. To manipulate CDs properties for their smart applications, CDs with CO 2 switchable luminescence property have been designed and prepared in the present work. It is found that fluorescence of the polyamine-functionalized CDs can be switched “off” and “on” in DMSO-water mixture by alternatively bubbling and removal of CO 2 . 13 C NMR spectra suggest that the mechanism behind the fluorescence “on-off” results involves the reversible acid-base reaction of the functionalized CDs with CO 2 and the formation of hydrophilic polyammonium bicarbonates. Due to the poor solubility of polyammonium bicarbonates in DMSO-water mixture, the formation of the polyammonium bicarbonates precipitation, by CO 2 bubbling, decreases the concentration of the functionalized CDs in aqueous DMSO, leading to the switch off of the fluorescence. When CO 2 is removed by N 2 bubbling, the precipitation is returned to the DMSO-water mixture, and thereby the fluorescence is switched on again. Based on this novel CO 2 -switchable photoluminescence property, the functionalized CDs have been used for the quantitative detection of CO 2 and SO 2 in aqueous solution and in the air.
研究领域:
材料科学
·
化学
·
环境科学
✓ 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）