FLUID PHASE EQUILIBRIA
·
2023
·
IF 2.6
Xiaomin Qiu,Huaqing Qi,Mengjin Zhou,Zhaoyou Zhu,Yinglong Wang,Jingwei Yang,Hengjun Gai
Sufficient and accurate physical property data is the basis for thermodynamic analysis and process simulation analysis. Reliable thermodynamic model data is essential for the study of extractive distillation separation of azeotropic mixtures. The vapor-liquid equilibrium data of 2-butanol alcohol-ethylene glycol and cyclohexane-butyl butyrate were measured by using a reliable experimental device, namely a modified Rose vapor-recirculating-type equilibrium still. The effects of 12 solvents on the relative volatility of the azeotrope of cyclohexane, 2-butanol alcohol and water were calculated, and ethylene glycol was selected as the best solvent. On this basis, the contribution of different atom pairs and atoms to the interaction between ethylene glycol and cyclohexane/2-butyl alcohol/water was compared and studied, and the reason why ethylene glycol can separate cyclohexane-2-butyl alcohol-water was analyzed. The thermodynamic model parameters obtained from the vapor-liquid equilibrium experiment were used to simulate the extractive distillation process, and total annual cost optimization was performed to improve the process accuracy. Overall, this study improves the application potential of phase equilibrium data in azeotropic separation technology, and establishes a reliable data and model foundation for the sustainable development of 2-butyl alcohol and cyclohexane.
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 THERMODYNAMICS
·
2016
·
IF 2.196
Maogang He,Nan Xin,Chengjie Wang,Yang Liu,Ying Zhang,Xiangyang Liu
In this work, we used a flow method for measurement of critical properties of six binary mixtures (2-butanol + cyclohexane, 2-butanol + hexane , 2-butanol + heptane, 2-butanol + octane, 2-butanol + nonane and 2-butanol + decane) and two ternary mixtures (2-butanol + hexane + heptane and 2-butanol + octane + decane). The critical properties were determined by observing the disappearance and reappearance of the gas–liquid phase meniscus in a quartz glass tube. The standard uncertainties of temperatures and pressures for both binary and ternary mixtures were estimated to be less than 0.2 K and 5.2 kPa, respectively. These critical data provide the boundaries of the two-phase regions of the related mixture systems. Six binary systems show non-ideal behaviors in the loci of critical temperatures. We used the Redlich–Kister equations to correlate the critical temperatures and pressures of these systems and listed the binary interaction parameters. The maximum average absolute deviation (AAD) of each binary system between experimental data and calculated results from Redlich–Kister equations is 0.038% for critical temperatures, and 0.244% for critical pressures. Moreover, the two ternary systems were newly reported and correlated by Cibulka’s and Singh’s expressions. The maximum AAD of critical temperatures and critical pressures are 0.103% and 0.433%, respectively.
研究领域:
物理化学
·
燃料化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Hongyue Guo,Yifang Wu,Qingsong Li
To separate the azeotropic system of 2-methyl-2-butanol and water, the liquid–liquid equilibria (LLE) data of water + 2-methyl-2-butanol + solvents (anisole, isoamyl alcohol, 1-octanol, ethyl acetate, methyl isobutyl ketone) were obtained at 308.2 K under 101.3 kPa, and all systems are Treybal’s type II. The distribution coefficient and selectivity coefficient were used to evaluate the effect of extraction and separation of water and 2-methyl-2-butanol. Meanwhile, quantum chemical methods were used to analyze intermolecular interactions. Finally, the Non-random Two Liquids and UNIQUAC thermodynamic models were used to correlate the LLE data to obtain binary interaction parameters with the RMSD being less than 0.19%. Meanwhile, the consistency of regression parameters of NRTL and UNIQUAC models was verified by the GUI-MATLAB tool.
研究领域:
化学工程
·
物理化学
✓ 已验证
DOI
高影响因子
Electrocatalysis
·
2022
·Vol. 13
·期 6
·818-829
·
IF 2.933
Dong Zhichen,Wu Jian,Guo Xingjia
In this work, we prepared cubic nickel oxide (NiO) nanosheets and constructed NiO with oxygen defects induced by halogen Cl ions (NiO-Vo1). Cubic nickel oxide nanosheets were used as catalysts for electrocatalytic oxygen evolution reaction (OER) and oxidation of chiral 2-butanol. Under artificial simulated sunlight, NiO-Vo1 exhibited good photo-electrocatalytic OER activity and catalytic stability. The high catalytic activity is mainly attributed to the activation of nickel active sites by the halide ion-induced oxygen defect and the enhancement of photoinduced electron–hole separation efficiency. Furthermore, the electrocatalytic performance of oxygen-deficient nickel oxide for the oxidation of chiral 2-butanol was investigated. The results show the catalytic activity of NiO-Vo1 for electrocatalytic oxidation of 2-butanol to butanone compared with NiO. Interestingly, there is no significant difference in the electrocatalytic activity of NiO for (R)-(-)-2-butanol and (S)-( +)-2-butanol oxidation. When NiO-Vo1 was used as the catalyst, the catalytic oxidation reaction rate of (R)-(-)-2-butanol alcohol was significantly higher than that of (S)-( +)-2-butanol alcohol. At 1.77 V vs RHE voltage, the (R)-(-)-2-butanol alcohol has obvious oxidation reaction while the (S)-( +)-2-butanol alcohol is almost absent, realizing the selective electrocatalytic oxidation of (R)-(-)-2-butanol alcohol. This may be attributed to the difference in the interaction strength of chiral molecules with the surface defects of NiO after applying a voltage during the catalytic process, resulting in different catalytic activities. Here, our proposed strategy through the synergistic effect of applied voltage and surface defects provides a new approach for chiral molecule synthesis and efficient chiral resolution. The halide ion-induced defect-catalyst provides a new strategy for the preparation of efficient electrocatalytic water splitting OER and alcohol-selective oxidation catalysts. Graphical Abstract
研究领域:
材料科学
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电化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Lungang Chen,Yong Liu,Canshuo Gu,Gang Feng,Xinghua Zhang,Jianguo Liu,Qi Zhang,Chenguang Wang,Longlong Ma
Selective production of 2-butanol from levulinic acid (LA) hydrogenolysis over a non-precious catalyst is long desirable. However, the process requires the precious metal Ru, and the yield of 2-butanol was less than 65%. Herein, we prepared Ni-based bimetallic catalysts, among which the NiMn catalyst exhibited the highest efficiency and reached an 84.5% yield of 2-butanol at 100% LA conversion under optimal conditions. The electronic states and surface properties were characterized by various techniques such as X-ray diffraction, X-ray photoelectron spectroscopy, temperature-programmed desorption, temperature-programmed reduction, and scanning electron microscopy/transmission electron microscopy. The high efficiency of the NiMn catalyst was due to the synergy between Ni0 and Mn2+ species, and the modified surface showed a high basicity and a high affinity to adsorb LA and LA-derived molecules with C═O or COOH. The high affinity of the NiMn catalyst was further confirmed by density functional theory calculations.
研究领域:
催化化学
·
可再生能源
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Food Biophysics
·
2024
·Vol. 20
·期 1
·1-13
·
IF 2.8
Chen Xing-Shuo,Yang Jie,Mao Yi-Nuo,Sun Gui-Jin,Li Ying-Qiu,Wang Chen-Ying,Liang Yan,Zhao Xiang-Zhong,Mo Hai-Zhen
This study investigated the bitterness, structure, physicochemical properties and functional properties of peanut protein hydrolysate (PPH) debittered using β-CD and 2-butanol. The sensory properties of debittered PPH were characterized using sensory evaluation combined with electronic tongue and colorimetric analysis. High-performance size exclusion chromatography (HPSEC) and Fourier transform infrared (FTIR) spectroscopy characterized the structures of debittered PPH. Surface hydrophobicity, components of amino acids, and DPPH and ABTS radical scavenging capacities characterized the functional and physicochemical properties of debittered PPH. Bitterness of PPHF-4 with combined treatment of β-CD and 2-butanol was negligible with bitterness score (0.24) and almost unchanged color. Moreover, PPHF-4 retained a high level of umami with the electronic tongue umami response value (12.95). Surface hydrophobicity and amino acid analyses showed that PPHF-4 had the lowest surface hydrophobicity (8.36) and hydrophobic amino acids (202.62 mg/g) content among PPHs debittered. HPSEC analysis showed that compared to untreated PPH, protein hydrolysates less than 5.57 kDa in PPHF-4 were obviously reduced and less than 1.68 kDa were completely removed. The DPPH and ABTS radical scavenging IC50 of PPHF-4 was 0.67 and 0.40 mg/mL, which was decreased but still had a high level of antioxidant properties compared to PPH (0.44 and 0.34 mg/mL).
研究领域:
食品科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
POSTHARVEST BIOLOGY AND TECHNOLOGY
·
2020
·
IF 4.303
Xueyin Ru,Ning Tao,Yanyan Feng,Qingqing Li,Qingguo Wang
Enzymatic browning is one of the essential issues affecting the quality of fresh-cut produce. In this study, we identified a novel, safe, and effective anti-browning agent, 3-mercapto-2-butanol, which can prevent fresh-cut potatoes from browning for 5 d under the concentration of 25 μL L −1 at 5 °C. The inhibitory effect of 3-mercapto-2-butanol was close to sodium bisulfite. 3-Mercapto-2-butanol was further identified as a competitive inhibitor which directly inhibited the activity of polyphenol oxidase (PPO) by enzyme kinetic analysis, and the expression levels of PPO-related genes ( POT32 and POT33 ) were decreased after 3-mercapto-2-butanol treatment. Besides, the concentration of enzymatic browning substrate tyrosine (Tyr) in the potato chips was found significantly higher in 3-mercapto-2-butanol treatment group than in the control group. We speculated that 3-mercapto-2-butanol could reduce the consumption of Tyr by inhibiting the activity of PPO. Our finding not only provided a novel and safe anti-browning agent candidate (3-mercapto-2-butanol) to efficiently solve the browning issue for fresh-cut food products, but also preliminarily revealed its mechanism in browning inhibition.
研究领域:
食品科学
·
植物生理学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yong Liu,Canshuo Gu,Lungang Chen,Wenguang Zhou,Yuhe Liao,Chenguang Wang,Longlong Ma
Metal–oxide interaction was widely observed in supported metal catalysts, playing a significant role in tuning the catalytic performance. Here, we reported that the interaction of Ru and MnOx was able to facilitate the hydrodeoxygenation of levulinic acid (LA) to 2-butanol with a high turnover frequency (1.99 × 106 h–1), turnover number (4411), and yield (98.8%). Moreover, this catalyst was capable of removing the hydroxymethyl group of lactones and diol with high yields of products. The high activity of the Ru–MnOx catalyst was due to the strong Ru–MnOx interaction, which facilitated reduction of Ru oxide to Ru0 and Mn oxide to Mn2+. The increased fractions of Ru0 and Mn2+ provided metal and Lewis acid sites, respectively, and therefore facilitated LA hydrodeoxygenation. A linear correlation between the hydrodeoxygenation activity of the Ru–MnOx catalyst and [Mn2+]ln([Ru0]) was observed.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Xuemei Zhang,Xiaojie Yang,Jie Jian,Chungui Jian,Jie He,Hongwei Wang,Wangxin Kong,Guangjin Shangguan,Meifang Xia
Liquid–liquid equilibrium (LLE) data of the ternary system 2-methyl-2-butanol + water + o-xylene were determined at 303.2, 313.2, and 323.2 K under 101.3 kPa. The extraction capacity of o-xylene is expressed by selectivity, which is more than 118 and decreases with the increase of temperature. The quality of the experimental LLE data is verified by calculation of the overall mass balance and alignment between the conjugated phases and overall compositions. The experimental LLE data were regressed by the NRTL and UNIQUAC models, and the binary interaction parameters were obtained. And the root-mean-square deviations (RMSDs) are less than 1.02%.
研究领域:
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Xingchuan Yang,Huanxin Li,Chunmei Cao,Li Xu,Guoji Liu
Liquid-liquid equilibria (LLE) data for ternary systems of water + 1,6-hexanediol + 1-pentanol/ 3-methyl-1-butanol/ 2-methyl-2-butanol were measured at (293.15, 303.15, 313.15 and 323.15) K under 101.3 kPa. Cloud-point method was applied to determine the solubility curves data. Distribution coefficient and separation factors for 1,6-hexanediol were calculated from the measured tie-line data to evaluate the extraction effect of alcohols on 1,6-hexanediol. The reliability of experimental LLE data were tested by Othmer–Tobias equation and Hand equation, NRTL and UNIQUAC models were applied to correlate the measured data and the calculated results show that both models can fit the experimental data very well.
研究领域:
化学工程
·
热力学
✓ 已验证
DOI
高影响因子
Journal of Central South University
·
2020
·Vol. 26
·期 11
·2974-2986
·
IF 1.249
Xu Si-quan,Pan Dong-hui,Xiao Guo-min
With the aim of achieving a high 5-hydroxymethylfurfural (HMF) yield from glucose with H-ZSM-5 catalyst at low cost, three inexpensive biphasic reaction systems, H 2 O—tetrahydrofuran (THF), H 2 O—2-methyltetrahydrofuran (MeTHF) and H 2 O’2-butanol, were discovered and proved to be particularly effective in promoting the formation of HMF from glucose over H-ZSM-5 zeolite. In order to determine the optimal process conditions, the effects of various experimental variables, such as reaction temperature, reaction time, catalyst dosage, volume of organic solvent, as well as inorganic salt type on glucose conversion to HMF in three systems were investigated in detail. It was found that under optimal reaction conditions, H 2 O—THF, H 2 O—2-butanol and H 2 O—MeTHF allowed the glucose dehydration process to achieve HMF yields of up to 61%, 59%, and 50%, respectively. Moreover, in the three biphasic systems, the H-ZSM-5 catalyst was also demonstrated to maintain excellent stability. Thus, the catalytic approach proposed in this paper can be believed to have potential prospects for industrially efficient and low-cost production of HMF.
研究领域:
化学工程
·
生物质转化
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
RUSSIAN JOURNAL OF GENERAL CHEMISTRY
·
2021
·Vol. 91
·期 4
·726-731
·
IF 0.868
Xu Y.,Hu Y.,Bao Q.,Zhang J.,Liu B.,Zhang Z.,Zhang Q.,Zhang H.
Copper phyllosilicate has been synthesized from a solution of sodium silicate and copper nitrate by co-precipitation under acidic conditions followed by reduction under H 2 flow for using it as the Cu/SiO 2 catalyst. The catalyst has been characterized by XRD, XPS, FTIR and Raman spectra, EDS, BET, and TEM. It is confirmed that only copper phyllosilicate and SiO 2 exist in the catalyst precursor, and there has been no CuO. Physical and chemical properties of Cu/SiO 2 catalyst have been evaluated. The Cu/SiO 2 catalyst has not only a large specific surface area and abundant mesopores but also the advantages of high dispersion of copper nanoparticles and the combination of Cu 0 and Cu + . The catalyst demonstrates high activity and selectivity in the reaction of 2-butanol dehydrogenation to methyl ethyl ketone.
研究领域:
催化化学
·
材料科学
·
物理化学
·
纳米材料
·
有机合成
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）