CHINESE JOURNAL OF CHEMICAL PHYSICS
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2010
·Vol. 23
·期 3
·317
·
IF 0.489
Wei Xu,Chuan-xin Xie,Hong-ling Li,Yi-ling Tian
High-pressure vapor-liquid equilibrium data for the binary systems of methyl propionate+carbon dioxide and propyl propionate+carbon dioxide were measured at pressure from 1.00 MPa to 12.00 MPa and temperature in the range from 313 K to 373 K. Experimental results were correlated with the Peng–Robinson equation of state with the two-parameter van der Waals mixing rule. At the same time, the Henry's coefficient, partial molar enthalpy change and partial molar entropy change of CO2 during dissolution at different temperature were also calculated.
研究领域:
化学工程
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热力学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2012
·
IF 2.422
Jianguo Zhou,Rongjiao Zhu,Pingfang Yuan,Liqian Cao,Yiling Tian
Isothermal (vapour + liquid) equilibrium data for the binary systems of (CO + methyl propionate) and (CO + ethyl propionate) were measured at temperatures of (293.15, 313.15, 333.15, 353.15, and 373.15) K and at elevated pressures up to 10.00 MPa. The measurements were carried out in a cylindrical autoclave with a moveable piston and an observation window. The experimental results were correlated using the Peng–Robinson (PR) equation of state and Peng–Robinson–Stryjek–Vera (PRSV) equation of state with the two-parameter van der Waals II or Panagiotopoulos–Reid mixing rule. The comparisons of the calculation results with experimental values indicate that the PRSV equation of state with van der Waals II mixing rule produced the better correlated results.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2009
·
IF 2.063
Li Hongling,Zhu Rongjiao,Xu Wei,Xu Hongfei,Dong Zeliang,Tian Yiling
High-pressure vapor−liquid equilibrium data for (methyl propionate + carbon dioxide) and (propyl propionate (PP) + carbon dioxide) were measured at pressures from (1.00 to 12.00) MPa and temperatures in the range from (313.0 to 373.0) K. Experimental results were correlated with the Peng−Robinson equation of state with the two-parameter van der Waals mixing rule. At the same time, the Henry’s coefficient and partial molar enthalpy change and partial molar entropy change of CO2 during dissolution at different temperature were also calculated.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2021
·
IF 9.147
Rui Wang,Mei Li,Jinguang Liu,Fenfen Wang,Jing Wang,Zhongkai Zhou
The effect of dual modifications of pullulanase debranch and propionylation on rice starch property was investigated in this study. The occurrence of the propionylation in starch molecules was confirmed due to the formation of a new peak at 1750 cm −1 in FTIR spectrum and the characteristic peaks around 1.0 (methyl) and 2.2 (methylene) ppm in NMR compared with the native starch. Interestingly, because of the higher tendency of molecular retrogradation following the debranching, the current results revealed that there was no positive correlation between the amylose content (AC) and the debranching time. Debranching treatment increased the degree of substitute (DS) of the propionyl starch, and the AC was positively correlated with DS (R = 0.7753*), indicating that AC is an important element affecting propionyl reaction due to the exposure of more available hydroxyl groups during debranching. Meanwhile, debranching led to an increased crystallinity level and the crystallinity pattern changed from A-type to B-type, which is associated with the changes in their corresponding hydrolysis resistance. The NMR data also proved that the propionylation involves the replacements of the glucose in the starch structure (C-2, C-3 and C-6) with acyl groups of the desired complexes. Furthermore, the sequence of the reactions that occur in the process of propionylation and their mechanisms are proposed in the current study.
研究领域:
食品科学
·
生物化学
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产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2025
·
IF 2.9
Shuyan Liu,Xiuyu Du,Kuan Ji,Lili Lv,Yu Zhou
Ionic liquids (ILs) are highly effective entrainers for extractive distillation of azeotropes, owing to their unique physicochemical properties. However, the intrinsic molecular mechanisms underlying the role of ILs in azeotropic separation process remain insufficiently understood. To investigate the intrinsic causes of the azeotropy elimination by ILs, the study focused on the v(O−D) region of the ethanol employing both experimental and theoretical methods to investigate the microstructural properties of the ethyl propionate (EP)−ethanol azeotrope before and after separation by the 1-hexyl-3-methylimidazole acetate (HMIMOAc). The key findings are as follows: (1) The interaction between HMIMOAc and ethanol issignificantly stronger than that between EP and ethanol. (2) The interaction between [OAc]− in HMIMOAc and ethanol plays a critical role in eliminating the azeotropy. (3) Ethanol self-aggregates, EP−ethanol interaction complexes, and HMIMOAc−ethanol interaction complexes, were identified andcharacterized using excess spectroscopy and quantum chemical calculations.
研究领域:
化学工程
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物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Fan Yang,Tianzhao Wu,Tinghe Song,Qinqin Zhang,Zhigang Zhang
During the preparation of n-propyl acetate (NPAC), an azeotropic mixture of NPAC and n-propanol (NPA) will form inevitably, which is difficult to separate by ordinary distillation. In this work, COSMO-RS model was applied to screen appropriate ionic liquids (ILs) to separate the binary azeotrope of NPAC - NPA. 1-decyl-3-methylimidazolium acetate ([DMIM][Ac]), 1-octyl-3-methylimidazolium acetate ([OMIM][Ac]), and 1-hexyl-3-methylimidazolium acetate ([HMIM][Ac]) were selected as entrainers based on solvent capacity and selectivity. The vapor–liquid equilibrium (VLE) data of the binary system (NPA - NPAC) and the ternary system (NPA - NPAC - IL) were measured at atmospheric pressure. The thermodynamic consistency of VLE data was verified by van Ness test and Wisniak's L-W test. The NRTL (non-random two liquids) model was used to correlate the VLE experimental data and obtained good applicability. The experimental results demonstrated that all three ionic liquids can improve the relative volatility of NPAC to NPA, and the separation effect is more obvious with the increase of ionic liquid content. The separation performance order of three ionic liquids follows: [HMIM][Ac] > [OMIM][Ac] > [DMIM][Ac]. Finally, ESP analysis, mutual penetration analysis, and IGMH analysis plus QTAIM topological analysis were used to explore the mechanism of separation. The analysis results indicate that the interaction between ionic liquids and NPA is stronger than that between ionic liquids and NPAC. In addition, the stronger interaction between [DMIM][Ac] and NPA is due to their strong hydrogen bond (HB) interactions.
研究领域:
化学工程
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分离科学
✓ 已验证
产品关联
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2017
·Vol. 122
·期 2
·1031-1047
·
IF 1.264
Meng Chen,Cao Gui-Ping,Yan Yi-Zhen,Zhao En-You,Hou Lin-Yi,Shi Hua-Yi
In this work, during the synthesis and hydrolysis of cellulose acetate propionate (CAP), the research not only focused on the contents, but also the distributions of acetyl and propionyl groups in the different positions of anhydroglucose unit, i.e. C2, C3 and C6. It was investigated that cellulose propionylation was more difficult than acetylation, which required larger amounts of reagents. At the same temperature, the reaction rate constant of cellulose acetylation was much higher than that of propionylation. Furthermore, the partial degrees of propionyl substitution in CAP were 0.54, 0.54, and 0.48 for C2, C3, and C6. The contents of propionyl distributed on C2 and C3 positions were higher than that on C6 indicating that acetyl took the position of C6 preferentially. During the hydrolysis of CAP, the degrees of hydrolysis were 0.1 for acetyl and 0.3 for propionyl. Acetyl groups in the C6 position and propionyls in the C2 position were hydrolyzed much easier with the degrees of hydrolysis of 0.16 and 0.32, respectively. In addition, it has been investigated that hydroxyl groups in the C3 position exhibited the lowest reactivity during the synthesis of CAP, while acyl groups on C3 was also the hardest to be hydrolyzed.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2024
·
IF 2
Jingheng Zhu,Yanli Sun,Yongbo Chen,Niangeng Wu,Ruicheng Shi,Zhongqi Ren,Qunsheng Li,Hongkang Zhao
This study investigates the vapor–liquid phase equilibria for the binary system of methyl propionate and ethanol as well as for the ternary system with three ionic liquids, [BMIM][OAC], [EMIM][OAC], and [MMIM][DMP], as extractants. The nonrandom two-liquid (NRTL) model was employed to correlate the vapor–liquid phase equilibrium data. Results indicate that each ionic liquid increases the relative volatility of methyl propionate to ethanol and effectively breaks the azeotrope at a molar fraction of 0.08. The NRTL model exhibited an average relative deviation of 2.46% for binary systems and 3.73, 4.05, and 3.60% for ternary systems. Of the ionic liquids tested, [BMIM][OAC] achieved the highest separation efficiency in the methyl propionate-ethanol azeotropic system.
研究领域:
化学工程
·
分离技术
✓ 已验证
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2018
·
IF 2.197
Shujie Li,Xiaoling Huang,Qiang Huang,Tongtong Guo,Shuaishuai Yun,Chunlan Ban,Guopeng Shen
The vapor-liquid equilibria at 101.3 kPa of seven binary systems: ethanol (1) + cyclohexane (2), ethanol (1) + n-hexane (2), ethanol (1) + n-octane (2), cyclohexane (1) + ethyl propionate (2), n-hexane (1) + ethyl propionate (2), n-octane (1) + ethyl propionate (2) and ethanol (1) + ethyl propionate (2), three ternary systems : ethanol (1) + cyclohexane (2) + ethyl propionate (3), ethanol (1) + n-hexane (2) + ethyl propionate (3) and ethanol (1) + n-octane (2) + ethyl propionate (3) at temperatures from 332.15 to 396.85 K were studied, all the binary VLE data passed the Herington test. Wilson, NRTL and UNIQUAC models were used to correlate experimental VLE data of the all systems to obtain interaction parameters through the MATLAB software and the experimental values were compared with the regression results. The Wilson and NRTL models reproduced the experimental values very well. Ternary VLE behavior were successfully predicted by the correlated binary parameters. The VLE data for the binary and ternary systems predicted by the correlated interaction parameters were in good agreement with all the experimental data.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yuyan Yang,Shaowei Yan,Bin Yu,Chang Gao,Kuan Chang,Jing Wang
Emulsion systems are widely used as carriers for diverse actives processing moisturizing, anti-aging, whitening and other functions. Recently, emulsions containing lamellar gel phase have been attracting more and more research interests since it improves the physical stability of degradable actives. In the present work, o/w emulsions containing lamellar gel phase composed of ceteareth-20 (O-20) and mixed fatty alcohols (FA) were developed for retinyl propionate (RP) stabilization and transdermal delivery . The lamellar gel phase was confirmed by XRD combined with cryo-SEM, and main factors for lamellar gel phase formation were investigated and discussed. Moreover, effects of carrier oil on the emulsion properties were studied and the result showed that introduction of carrier oil benefits RP retention, rheological and transdermal properties. This study proves that O-20/FA based lamellar phase emulsion is promising system for RP stabilization and utilization in cosmetic formulations.
研究领域:
化妆品科学
·
药物递送系统
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Jie Wang,Yi Zhang,Ao Li,Jun Gao,Dongmei Xu,Lianzheng Zhang,Yinglong Wang
Extractive distillation with propyl propionate, butyl propionate and butyl butyrate as extractive solvents is adopted to separate the binary azeotrope isopropyl alcohol + isopropyl acetate. Through the relative volatility and x - y diagrams, the influence of the three entrainers on the vapour-liquid equilibrium (VLE) behaviour is also explored. The isobaric VLE data for the binary systems of isopropyl acetate + propyl propionate/ butyl propionate/butyl butyrate are determined at 101.3 kPa with a modified Rose type recirculating still, and the determined VLE data of the three systems containing isopropyl acetate are checked to be thermodynamically consistent according to the Herington and van Ness test. Finally, the NRTL, UNIQUAC and Wilson activity coefficient models are employed to correlate the measured data. After that, the corresponding binary interaction parameters for the investigated systems are obtained, which can provide a basis for the simulation and optimization of the extractive distillation process.
研究领域:
化学工程
·
化工分离过程
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Qing Zhao,Mengjin Zhou,Haiyang Cheng,Jiuxu Ruan,Yangyang Wang,Zhaoyou Zhu,Peizhe Cui,Yinglong Wang,Jingwei Yang
Efficient recovery of isopropyl acetate and isopropanol from wastewater during esterification is important. An efficient separation process using ionic liquid mixed solvent extractive distillation (MSED) to separate azeotropic mixtures was proposed. The selectivity of 169 ionic liquids was calculated based on the COSMO–segment activity coefficient model for prescreening ionic liquids. The influence of the structure of the ionic liquids on the separation performance was further explored through molecular dynamics to determine 1-ethyl-3-methylimidazole acetate ([EMIM][AC]) as the best solvent. The vapor–liquid equilibrium of the system under the influence of [EMIM][AC] was measured to verify the model used for the calculation. A multi-objective genetic algorithm was used for optimizing the process parameters with the total annual cost (TAC) and gas emission as objective functions. An energy-saving heat-pump-assisted heat-integrated extractive distillation (HPHIED) process was proposed to realize heat recovery in MSED. The results showed that the TAC and gas emissions of MSED were 26.83% and 25.32%, respectively, lower than those of the single-organic solvent extractive distillation process. The TAC and gas emissions of HPHIED process were 11.02% and 35.83%, respectively, lower than those of MSED.
研究领域:
化学工程
·
环境工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）