Materials
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2019
·Vol. 13
·期 1
·29
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IF 2.972
Jianmeng Jiao,Jafar Safarian,Bettina Grorud,Merete Tangstad
Si-B alloys are proposed as a potential phase change material (PCM) in the novel high temperature thermal energy storage systems. For successfully introducing the new PCM, the selection of proper refractory material in the PCM container is vital. At present, graphite is chosen as a potential refractory material for the PCM container, due to its high temperature stability, low thermal expansion, and high thermal conductivity. The Si-B alloys and the high-temperature interaction with graphite are hence studied. The phase formation in the Si-B alloys and the interaction with graphite at B content of 2–11 mass % and temperatures of 1450–1750 °C were investigated. Carbides were observed at the interface between the solidified alloys and the graphite. A single SiC layer was produced at B content of 2 and 3.25 mass %. Otherwise, SiC and B4C layers were generated at B content higher than 5 mass %. In the Si-B-C system, the phase formation is dependent on the B content. Moreover, the equilibrium B content is calculated to be 3.66 mass % in the molten Si-B alloys at 1450 °C in equilibrium with SiC and B4C, based on the experimental results. In this regard, the eutectic alloy (3.25 mass % B) is recommended to be used as the new PCM in the graphite container, due to that it produces simple phases and also because it is expected not to deplete any B to the B4C layer.Keywords:Si-B alloys;graphite;PCM;carbon solubility;carbides
研究领域:
材料科学
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热能工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2021
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IF 2.694
JinTao He,XueMan Xu,Xia Gui
New phase equilibrium data of CO2 in n-hexadecane, n-heptadecane, n-octadecane, n-nonadecane, and n-eicosane were measured at temperatures from 333.15 to 373.15 K up to 23.73 MPa by a constant-volume method. Thermodynamic properties of Gibbs free energy (ΔsolG), enthalpy change (ΔsolH), entropy change (ΔsolS), and Henry’s coefficient (H) were calculated and analyzed for elucidating the dissolution mechanism of CO2 in alkanes. Results showed that the CO2 solubility increased with increasing pressure but decreased with increasing temperature and carbon number. In addition, increasing carbon number also led to an increase in the minimum miscibility pressure (MMP) of alkanes with CO2 and thus limited CO2 solubility in alkanes.
研究领域:
化学热力学
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石油工程
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DOI
高影响因子
Petroleum Science
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2022
·
IF 4.757
Jun-Liang Wang,Zi-Hao Song,Lin-Jun Li,Li-Li Yang,Quan-Yuan Wang,I-Ming Chou,Zhi-Yan Pan
To determine the solubility of CO 2 in n-dodecane at T = 303.15–353.15 K, P ≤ 11.00 MPa, an integrated fused silica capillary and in-situ Raman spectroscopy system was built. The Raman peak intensity ratio ( I CO 2 / I C - H ) between the upper band of CO 2 Fermi diad ( I CO 2 ) and the C–H stretching band of n-dodecane ( I C - H ) was employed to determine the solubility of CO 2 in n-dodecane based on the calibrated correlation equation between the known CO 2 molality in n-dodecane and the I CO 2 / I C - H ratio with R 2 = 0.9998. The results indicated that the solubility of CO 2 decreased with increasing temperature and increased with increasing pressure. The maximum CO 2 molality (30.7314 mol/kg) was obtained at 303.15 K and 7.00 MPa. Finally, a solubility prediction model ( ln S = ( P − A ) / B ) based on the relationship with temperature ( T in K) and pressure ( P in MPa) was developed, where S is CO 2 molality, A = − 8 × 10 − 6 T 2 + 0.0354 T − 8.1605 , and B = 0.0405 T − 10.756 . The results indicated that the solubilities of CO 2 derived from this model were in good agreement with the experimental data.
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
Processes
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2023
·Vol. 11
·期 4
·1137
·
IF 3.5
Junliang Wang,Zhenzhen Zhang,Quanyuan Wang,Tianhong Lou,Zhiyan Pan,Mian Hu
Understanding the solubility of CO2is critical for implementing CO2-enhanced oil recovery (CO2-EOR). In this work, the solubility of CO2inn-decane in a temperature range between 303.15 K and 353.15 K and pressures up to 15 MPa was measured using a fused silica capillary cell with in situ Raman spectroscopy. A semi-empirical CO2solubility prediction model was obtained according to the experimental results. In order to improve the solubility of CO2inn-decane, the solubility of CO2inn-decane and co-solventn-hexane (3% wt) mixture was also comparatively investigated. The results indicated that the solubility of CO2inn-decane was 1.6355~64.0084 mol/kg. The data from the prediction model were in good agreement with the experimental data, and the mean relative deviation was 3.65%, indicating that the prediction model could be used to predict the solubility of CO2inn-decane under different conditions. The solubility of CO2inn-decane +n-hexane system ranged from 1.0127 mol/kg to 65.7286 mol/kg. It was found that, under low-pressure conditions, the addition of co-solventn-hexane did not enhance the solubility of CO2, while it had a certain enhancement effect on the dissolution of CO2under high-pressure conditions. As the temperature increased from 303.15 K to 353.15 K, the enhancement efficiency of the solubility of CO2also increased from 1.34~2.05% to 8.17~9.82%, and the average enhancement efficiency increased from 1.74% to 9.00%. This study provides more CO2solubility data for CO2-EOR.Keywords:CO2solubility;n-decane;n-decane +n-hexane;Raman spectroscopy
研究领域:
石油工程
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化学工程
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2014
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IF 2.045
Xia Gui,Wei Wang,ChenWei Wang,Ling Zhang,Zhi Yun,Zhg Tang
The solubility of CO2 in polyethylene glycol dimethyl ether (NHD), octamethyl cyclotetrasiloxane (D4), and diethyl succinate (DS) was determined at the temperature variations from 285.19 K to 313.26 K up to 6 MPa by the constant-volume method. Then, Henry’s law constant (H) based on mole fraction was obtained by linear fitting of the vapor–liquid phase equilibrium data, and some thermodynamic properties of solutions were also calculated from the correlation of H. The values of H in NHD, D4, and DS vary from 2.5 MPa to 8 MPa and increase in the following order: DS < D4 < NHD, which is identical to the order of the solvents ability to dissolve CO2. Additionally, Henry’s law constant increases with temperature increase to confirm the solubility of CO2 decrease in the corresponding solvents for the pressure range studied.
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
JOURNAL OF SOLUTION CHEMISTRY
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2023
·Vol. 52
·期 9
·1033-1047
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IF 1.2
Li Ke,Li Renjiang,Duan Xiuzhi,Deng Dongshun
Emission of NH 3 or CO 2 containing tail gases will aggravate environmental problems of global climate warming, fog, and haze. Developing efficient absorbent for them is highly desirable. In present work, new type V pyrazole (Py)/glycerol (Gly) DESs with Py/Gly molar ratios of 1:1 and 1:2 were prepared. Their densities and viscosities with temperature were measured. The solubilities of NH 3 or CO 2 in two DESs were determined, with the near atmospheric solubilities of NH 3 and CO 2 up to 8.7052 mol·kg −1 and 0.0395 mol·kg −1 for Py/Gly DESs (1:1), respectively. Henry’s constant and the dissolution Gibbs free energy, enthalpy, and entropy changes of gas dissolution were obtained by correlating the experimental data. What’s more, Py/Gly DESs (1:1) presents potential ability to preferentially separate NH 3 from the tail gas containing NH 3 and CO 2 due to its ideal selectivity of NH 3 /CO 2 as high as 189.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2021
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IF 6.165
Wanbo Zhang,Ping Guo,Xingbo Ge,Jianfen Du,Zhouhua Wang
In CO 2 enhanced oil recovery process, the interactions between CO 2 and oil components are complex since crude oil is a mixture of n-alkanes, cycloalkanes , aromatics, resin, asphaltene and other compounds. To investigate the effects of temperature, pressure and molecular structure on CO 2 solubility in cycloalkanes and the resulting cycloalkane volume expansion, the solubility of near critical and supercritical CO 2 in cyclopentane (CP), cyclohexane (CH), methylcyclohexane (MCH), methylcyclopentane (MCP) and ethylcyclohexane (ECH) and the volume expansion factor of cycloalkanes at diverse temperature and pressure were measured. It was observed that increasing temperature decreases CO 2 solubility, while CO 2 solubility increases with pressure increasing. Compared with CP and CH, it's harder for CO 2 to dissolve in their methyl or ethyl substituents. For homologues, CO 2 solubility decreases with carbon number increasing. The volume expansion factor and solubility have a same variation tendency with temperature, pressure and molecular structure. The experimental results of solubility were correlated with Fornari's model and PR equation of state with the maximum average absolute relative deviation (AARD) of 2.8% and 6.8%, respectively. The excess molar volume of CO 2 + cycloalkane mixtures was calculated to be negative and increases with pressure.
研究领域:
石油工程
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化学工程
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2016
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IF 1.835
Xiaofeng Li,Yaotai Jiang,Guoqiang Han,Dongshun Deng
Solubilities of CO2 have been measured in five low volatile organic solvents at temperatures ranging from 293.15 to 323.15 K with 10K intervals under a pressure of 0 to 600.0 kPa using an isochoric saturation method. These organic solvents were selected from γ-butyrolactone (GBL), butyl lactate (BL), 1,1,3,3-tetramethylurea (TMU), 1,3-dimethyl-2-imidazolidinone (DMI), and 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone (DMPU). Henry’s constants and thermodynamic properties such as Gibbs free energy, enthalpy, and entropy of dissolution were derived from the corresponding solubility data. The gravimetric solubilities of CO2 in these solvents followed the sequence of TMU > DMI ≈ BL ≈ GBL > DMPU. The enthalpies of dissolution were all exothermal at each condition. Henry’s constants of CO2 in these solvents were further compared with those in ionic liquids and other ordinary absorbents, and it was found that they were similar to that of CO2 in polyethylene glycol dimethyl ether (NHD), which is widely used in the present industry.
研究领域:
化学工程
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2016
·
IF 1.835
Xiaofeng Li,Xiaobang Liu,Yaotai Jiang,Dongshun Deng
Using the isochoric saturation method, solubilities of CO2 in five biobased solvents (BBSs) have been determined at temperatures between 293.15 and 323.15 K with 10 K intervals and pressure scope of (0–600.0) kPa. The BBSs were selected from glyceryl triacetate (GT), glycerol formal (GF), dl-1,2-isopropyli-deneglycerol (GAK), triethyl citrate (TEC), and acetyl triethyl citrate (ATEC). Henry’s constants and thermodynamic properties such as Gibbs free energy, enthalpy, and entropy of dissolution were derived from the solubility data. The gravimetric solubilities of CO2 in BBSs changed with the sequence of GT > ATEC > TEC ≈ GAK > GF. All the dissolution enthalpies were negative at each condition. The dissolution capacities of BBSs for CO2 were further compared with those of several common absorbents as well as ionic liquids. It was shown that they were similar to polyethylene glycol dimethyl ether (NHD) which is an industrial CO2 absorbent.
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
JOURNAL OF CHEMICAL THERMODYNAMICS
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2016
·
IF 2.196
Dongshun Deng,Yaotai Jiang,Xiaobang Liu,Zhiliang Zhang,Ning Ai
Solubilities of CO 2 have been determined in five deep eutectic solvents (DESs) at temperatures (303.15–333.15) K with 10 K intervals under a pressure of (0–600.0) kPa using isochoric saturation method. These DESs were prepared from levulinic acid (LA) and quaternary ammonium salt (acetylcholine chloride, ACC; tetraethylammonium chloride, TEAC; tetraethylammonium bromide, TEAB; tetrabutylammonium chloride, TBAC; and tetrabutylammonium bromide, TBAB) with the mole ratio of 3:1. Henry’s constants and thermodynamic properties such as Gibbs energy, enthalpy and entropy of dissolution were deduced by correlating the solubility data. Results demonstrated that the solubility of CO 2 in DESs increased with the increasing pressure or the decreasing temperature. The enthalpies of dissolution were all exothermal in each condition. The Henry’s law constants based on mole fraction and molality of CO 2 in DESs vary from (12.30 to 28.66) MPa and (1.79 to 3.94) MPa, respectively.
研究领域:
化学工程
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物理化学
✓ 已验证
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DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2017
·
IF 2.726
Yue Zhao,Shufeng Shen,Yangyang Bian,Ya-nan Yang,Ujjal Ghosh
In this work, CO 2 solubility in aqueous potassium lysinate solutions has been measured for the concentrations of (1.25–3.28) mol·kg −1 and at temperatures of (313–343) K. The vapour-liquid equilibrium data were correlated using a Soft model and a semi-empirical (SE) model. The proposed models can match well with the experimental data with AAD within 20%. The heat of absorption for LysK was estimated as about (55–70) kJ·mol −1 CO 2 absorbed from the solubility data. The lower heat of absorption, compared with that of 30 mass% MEA, will be beneficial for the reduction of regeneration energy.
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
ENERGY
·
2017
·
IF 4.52
Zhijun Zhao,Xiao Xing,Zhigang Tang,Yong Zheng,Weiyang Fei,Xiangfeng Liang,E. Ataeivarjovi,Dong Guo
CO 2 capture with solvent-based process is known as a promising technology for controlling the global warming. In this work, the constant-volume method was used to investigate CO 2 solubility in DMC, ionic liquid of [Omim][BF 4 ], and their mixtures from 298.15 to 328.15 K under pressures up to about 3 MPa. The COSMO-RS model was used to predict the Henry's constants and the vapor pressures of DMC in the mixtures. The experimental results showed the CO 2 solubility in [Omim][BF 4 ] is higher than DMC at 318.15–328.15 K and adding [Omim][BF 4 ] into DMC can decrease the viscosity compared to the pure [Omim][BF 4 ]. Besides, the COSMO-RS simulation results showed the Henry's constants in the mixtures increases with the decreasing mass ratio of [Omim][BF 4 ] which are consistent with experimental values and the vapor pressures of DMC in the mixtures decreases with the increasing mass ratio of [Omim][BF 4 ]. Moreover, the activation energy ( Ea ) predicted from viscosity showed the higher viscosity mean the larger Ea and the larger Ea indicate the higher CO 2 solubility in these solvents. Finally, the mixtures of DMC and [Omim][BF 4 ] may be used as promising physical solvents to capture CO 2 with high partial pressures, which combine the advantages of organic solvents and ionic liquids.
研究领域:
化学工程
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环境科学
✓ 已验证
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DOI
高影响因子
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