JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Chenyang Wen,Xianyang Meng,Kaixin Wei,Jiangtao Wu
The compressed liquid viscosities of 2-methylpentane, 3-methylpentane, and 2,3-dimethylbutane were measured using a vibrating-wire viscometer over the temperature range of (273 to 343) K and at pressures up to 40 MPa. The combined expanded uncertainty of the reported viscosity is about 2% with a confidence level of 0.95 (k = 2). An empirical Andrade–Tait equation was used to correlate the viscosity as a function of temperature and pressure with average absolute percentage deviations of 0.19%, 0.23%, and 0.25%, respectively.
研究领域:
化学工程
·
物理化学
✓ 已验证
DOI
高影响因子
ENERGY
·
2020
·
IF 6.082
Xiaoya Zang,Xuebing Zhou,Lihua Wan,Jing Wang,Deqing Liang
Cyclopentane (CP) is an alkane that combines with water to form hydrates. Here, we investigate the hydrate thermal dynamics and formation kinetics of a synthesized ternary gas mixture of CH 4 /CO 2 /N 2 with CP additives. The results indicated that CP shifts the phase equilibrium conditions of ternary gas mixture hydrates to higher temperature and lower pressure. Under a constant pressure, the largest temperature offset can be approximately 20 K. Meanwhile, the ternary gas mixture of CH 4 /CO 2 /N 2 formed structure II hydrates with added CP. The kinetics study indicated that the hydrate reaction started immediately when accompanied by stirring. The consumption of CO 2 gas was greater than that of CH 4 and N 2 . The ratio of the volume of CP to the volume of water had a considerable influence on the effective reaction time, CH 4 recovery factor (R CH4 ), and CO 2 split ratio (S CO2 ) under all experimental conditions. R CH4 and S CO2 were higher when the CP-to-water volume ratio was 0.308. The largest values of R CH4 and S CO2 were 3.098 and 0.908, respectively, when the CP-to-water volume ratio was 0.308 at 7.0 MPa and 280.1 K. These results favor the use of CP as an additive to separate CO 2 and purify CH 4 in gas mixtures.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Energies
·
2023
·Vol. 16
·期 12
·4681
·
IF 3.2
Xianbing Hu,Lingjie Sun,Chengyang Yuan,Man Li,Hongsheng Dong,Lunxiang Zhang,Lei Yang,Jiafei Zhao,Yongchen Song
The separation of azeotropic mixtures has conventionally been one of the most challenging tasks in industrial processes due to the fact that components in the mixture will undergo gas–liquid phase transition at the same time. We proposed a method for separating azeotropes using hydrate formation as a solid–liquid phase transition. The feasibility of hydrate-based separation is determined by analyzing the crystal structure and chemical bonds of hydrate. Taking the azeotrope cyclopentane and neohexane in petroleum as an example, cyclopentane (95%) was purified to 98.56% yield using the proposed hydrate-based cyclopentane purification technology. However, this is difficult to achieve using conventional distillation methods. The proposed method is simple in operation and yields a good separation effect. This study provides a new method for separating cyclopentane and neohexane.Keywords:azeotrope;cyclopentane;neohexane;hydrate;phase transition
研究领域:
化学工程
·
石油化工
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Kun Li,Han Tang,Mingke Yang,Xiaowan Peng,Ruihang Zhang,Chun Deng,Yunlei Peng,Bei Liu,Changyu Sun,Guangjin Chen
Separation of light hydrocarbon isomers is always an important and challenging task in the petrochemical industry due to their similar physicochemical properties. This paper presents the absorption-adsorption hybrid method to separate pentane isomers using a flowable zeolitic imidazolate framework-8 (ZIF-8) slurry prepared with N, N′-Dimethylpropylene urea (DMPU) and water. Firstly, the single-component kinetic sorption profiles for n-pentane and iso-pentane in the slurry were measured. It appears significant sorption kinetic differences between the pentane isomers in ZIF-8/DMPU-water slurry. Subsequently, the separation performances for n/iso-pentane gas mixtures were studied systematically. The results show that the selectivity for pentane isomers using ZIF-8/water slurry is extremely high (1877 specifically), and the selectivity decreases gradually when the DMPU content in the solvent increases, while conversely the sorption speed increases rapidly. The selectivity as a function of time was described to graphically characterize the kinetic-based separation for pentane isomers. With excellent behavior in selectivity, sorption speed, sorption capacity (1.10 mol/L for n-pentane in ZIF-8/DMPU slurry), and renewability, this absorption-adsorption hybrid method is of great potential in the separation of pentane isomers.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Mingwei Zhao,Yuxin Xie,Xiangjuan Meng,Lin Li,Caili Dai,Zhihao Zhang,Zhenfeng Ma,Yingnan Wang,Zhongzheng Xu,Xuguang Song
Effectively reducing the miscible pressure of CO 2 -oil is a crucial measure to achieve CO 2 miscible flooding. Alkanes have been extensively studied to improve the miscibility of CO 2 and oil, but few studies have elucidated the potential mechanisms and principles of their effects. In this work, the effect of pentane as a typical alkane on the miscibility behavior between CO 2 and oil is clarified. The interfacial tension of CO 2 -oil was measured by the high temperature and high pressure interfacial tension tester. The minimum miscible pressure (MMP) was extrapolated by the vanishing interfacial tension method. Meanwhile, the physical parameters (solubility, density, etc.) of oil and CO 2 were measured by visual PVT instrument. Oil composition analysis and AFM morphological scanning explained the extraction effect of CO 2 on oil. Finally, pentane-enhanced CO 2 flooding recovery was evaluated by physical simulation device. Results indicated that introducing the pentane effectively reduces the interfacial tensions and MMP, achieving an impressive 10.42% MMP reduction. Moreover, the addition of pentane to CO 2 -oil significantly increases the solubility of CO 2 in oil and the volume expansion of oil. CO 2 primarily extracts oil components with carbon numbers below C 10 . As CO 2 enrichment progresses, the concentration of resin and asphaltene increases, proved by a more roughening of the surface deposition morphology. Pentane can improve the solubilization and extraction of oil by CO 2 , and increase the recovery of CO 2 flooding by 19.94 %. This study is expected to facilitate the efficient utilization of CO 2 miscible flooding and provide the theoretical and technical support for its practical implementation in oilfield.
研究领域:
石油工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2024
·
IF 2.8
Tao Jia,Weixue Jiang,Jia Yu
The compressed liquid densities of n -pentane(1) + n -dodecane(2) binary mixtures were measured using a high pressure vibrating-tube densimeter at temperatures from 283 K to 363 K, pressures up to 100 MPa, and five different compositions ( x 1 = 0.3778, 0.6230, 0.7968, 0.9051, and 1). The densities of binary mixtures were correlated using the modified Tait equation, and the absolute average deviations of the experimental and calculated values were 0.010 %, 0.019 %, 0.016 %, 0.025 %, and 0.017 %, respectively. In addition, the isothermal compressibility and the isobaric thermal expansivity were calculated from the obtained densities.
研究领域:
物理化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ENERGY
·
2017
·
IF 7.182
Tao Wang,Wei Yu,Yann Le Moullec,Fei Liu,Yili Xiong,Hui He,Jiahui Lu,Emily Hsu,Mengxiang Fang,Zhongyang Luo
Using an inert, immiscible organic component as the purging gas is an innovative technology in the CO 2 stripping process. It allows stripping at a lower temperature and overcomes the inherent problem of high energy consumption in steam-based CO 2 stripping processes. This work focused on developing a novel, direct non-aqueous gas stripping process and exploiting its potential for energy saving through experiments. An elaborate pre-screening of carrier gases was conducted through hydrocarbon, alcohols, aldehydes, ketones, and their isomers, etc. Pentane, hexane, and cyclohexane were selected as the carrier candidates for their good immiscibility with water/amine, low vaporization energy, mild condensation conditions, and low toxicity. The effects of carrier gas category, carrier gas flow rate , and rich solvent feeding temperature on the stripping performance were investigated. Pentane was found to be the superior carrier gas due to its low heat of vaporization, high regeneration rate, and low energy requirement. A unique phenomenon of water evaporation from the solvent was discovered in the organic gas stripping process, providing a promising approach to break the gas-liquid interface for enhanced diffusion kinetics . The feasibility of low temperature CO 2 stripping was analyzed by varying the rich solvent feeding temperature (70–100 °C). With pentane as the stripping gas, it was interesting to find an optimum rich-feed temperature lower than 90 °C, indicating great potential for a reduction in the overall energy requirement. Under the optimal conditions, the energy consumption during CO 2 regeneration, using pentane as the carrier gas, was 2.38 GJ/t CO 2 , 38.8% lower than that of the conventional stripping process. Furthermore, parasitic issues, such as water loss and solvent loss, were discussed. An improved direct non-aqueous gas stripping process with two-stage compression was used to tackle the carrier gas recovery problem. The simulation results show that more than 98% of the carrier gas can be recovered through preliminary separation approaches.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Hongwei Xing,Junshuai Chen,Yongbo Zhang,Libin Chen,Maogang He,Ying Zhang
Transport properties of n-pentane are so scarce that it prevents the further studies of n-pentane as an important component of industrial fluids, especially in the near-critical and supercritical regions. In this work, the thermal diffusivity of n-pentane was measured by the dynamic light scattering method within the temperature limits of (293–573) K along six isobaric lines at p = (0.1, 3.0, 3.5, 5.0, 7.5, and 10.0) MPa. The relative uncertainty of the thermal diffusivity experimental system is estimated to be 2.6% for a coverage factor of k = 2 with a level of confidence of 0.95. The influences of temperature and pressure on thermal diffusivity were presented. Besides, we compared the experimental data with the calculated values from the thermal conductivity model proposed by Vassiliou et al. and the multiparameter equation of state proposed by Span and Wagner. The absolute average of relative deviation and maximum deviation between the experimental data and the calculated results are 1.12 and 3.74%, respectively.
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 Environmental Chemical Engineering
·
2021
·
IF 5.909
Yamei Yang,Rui Du,Changrui Shi,Jiafei Zhao,Yongchen Song,Lunxiang Zhang,Zheng Ling
With the rapid development of agriculture, controlling phosphorus emissions is a pressing challenge for preventing water eutrophication . A graphite-promoted cyclopentane (CP) hydrate-based desalination was proposed to remove K 3 PO 4 from effluents. It was found via the in situ optical microscopy that the reaction temperature and the concentration of feeding K 3 PO 4 solution significantly affect the morphologies and amount of the as-produced CP hydrate crystals. The lower reaction temperature produces more crystals with irregular shapes, while fewer crystals formed in K 3 PO 4 solution with higher concentration. The reaction temperature, time and feeding concentration-dependent desalination and salt enrichment performances were studied. It was found that desalination efficiency linearly increases with the elevated reaction temperature ranging from − 2 °C to 3 °C; however, water recovery declines with temperature. The temperature-dependent water recovery is due to the strong driving force for hydrate formation at low temperatures. The time-dependent water recovery shows a three-stage feature, including exponential growth, linear increase, and stable stages, owing to the interaction between the driving force of supercooling and the increasing K 3 PO 4 concentration during the reaction processes. The desalination efficiency shows an inverted volcanic shape with the increased concentration of feeding K 3 PO 4 solution. The pre-melting effect plays a critical role in improving desalination efficiency at high K 3 PO 4 concentrations. A maximum desalination efficiency of 85.0% was reached for treating an artificial solution with salinity as high as 42452 mg/L. Both desalted water and concentrated phosphorus-containing solution can be recovered by this method, which is attractive for producing freshwater with potential for recovery of resources.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
DESALINATION
·
2017
·
IF 5.527
Yi-Ning Lv,Shan-Shan Wang,Chang-Yu Sun,Jing Gong,Guang-Jin Chen
To make application of hydrate based desalination technology practical, the kinetic behaviors and separation capability were examined for cyclopentane hydrates formed from brine in cyclopentane dispersion systems at 274.1 K/277.1 K with initial salinity of 3 to 5 wt% for water fractions from 20.0 to 90.0 vol% and rpms from 300 to 500. The excess cyclopentane addition into brine and cyclopentane dispersion significantly increased the yield of dissociated water when the removal efficiency stayed around 80%. This implies enhanced kinetics and controlled encapsulation of residual brine into the hydrate phase for brine in cyclopentane dispersion systems. More hydrates formed under lower temperature or initial salinity. Higher rpm could further promote hydrate formation but would adversely affect the removal efficiency. Desalination efficiency was enhanced with washing during vacuum filtration and effects of ratio of washing water/dissociated water on the removal efficiency were considerable. An inverse correlation exists between the removal efficiency and the yield of dissociated water under the same conditions. Lower temperature (274.1 K) and 60% water cut should be optimal for higher yield of dissociated water from brine in cyclopentane dispersion. The ratio of washing water/dissociated water and rpm conditions should be adjusted depending on the situation.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2019
·
IF 2.514
Ying Zhang,Qi Zhou,Taotao Zhan,Junshuai Chen,Maogang He
n -Pentane is one of the main components in many industrial fluids, and is widely used as the fuel. The speed of sound can be used for developing the Helmholtz energy formulation and calculating other thermodynamic properties, which has not been reported yet for supercritical n -pentane. In this paper, the speed of sound in supercritical n -pentane was measured by the Brillouin light scattering (BLS) technique within the temperature limits of (422.69–653.53) K along four isobars at p = (3.5, 6.0, 8.0, and 10.0) MPa. The relative uncertainty of our BLS experimental system is estimated to be less than 0.6% and the relative uncertainty of the reported speed of sound values is estimated to be 0.85% considering the influence of impurities in the sample. The dependences of the speed of sound on temperature and pressure were also analyzed. At the end, we compared the experimental data with the calculated values from the multiparameter EOS proposed by Span and Wagner and the Modified BWR EOS proposed by J. Ratanapisit and J.F. Ely. The AARD is 1.3% for the multiparameter EOS and 1.5% for the Modified BWR EOS, respectively.
研究领域:
物理化学
·
工程热物理
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF THERMOPHYSICS
·
2014
·Vol. 35
·期 8
·1450-1464
·
IF 0.623
Wang Sheng,Zhang Ying,He Mao-Gang,Zheng Xiong,Chen Li-Bin
Transport and thermodynamic properties of pentane are necessary for the design and verification of reactors in pentane isomerization and degradation processes. However, there are few experimental data of these properties, especially in the high-temperature region. In this work, the thermal diffusivity and the sound speed of pentane have measured by dynamic light scattering and Brillouin light scattering, respectively. Pentane has been investigated under saturated conditions over a wide temperature range, from about 300 K up to the liquid–vapor critical point. It is estimated that: the standard uncertainty of temperature is \(u(T) = 0.01\) K for the hydrodynamic region and \(u(T) = 0.026\) K for the critical region; the relative expanded uncertainty in the thermal diffusivity is \(U_\mathrm{r}(a) = 0.03\) and the relative expanded uncertainty in the speed of sound is \(U_\mathrm{r}(c_\mathrm{s}) = 0.005\) with a coverage factor of \(k = 2\) . The thermal diffusivity and the sound-speed experimental data are also represented as functions of temperature. Finally, the results are discussed in detail in comparison with literature results and various prediction methods.
研究领域:
化学工程
·
物理化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）