JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2016
·
IF 1.835
Xueli Zhang,Yan Sun,Wei Su,Xueyuan Wang
As a new kind of adsorbent, graphene sheets (GS) possess large surface areas and excellent adsorption properties. To investigate the adsorption equilibria of C1–C4 from natural gas on GS and fit the isotherms by the Langmuir–Freundlich equation. GS were synthesized with a specific surface area of 805 m2/g and a specific pore volume of 1.03 cm3/g. The adsorption isotherms were measured using a volumetric method at five different temperatures between 263.15 and 303.15 K and at pressures of 0–6 MPa for CH4, 0–1.6 MPa for C2H6, 0–0.3 MPa for C3H8, and 0–0.05 MPa for C4H10. It was shown that, for all four hydrocarbons, the amount of adsorption decreased gradually as the temperature increased. The isotherms were described well by the Langmuir–Freundlich equation. The isosteric heat of adsorption values decreased in the order C4H10 > C3H8 > C2H6 > CH4 which was consistent with those of the extreme heats of adsorption. This suggests that the adsorption capacities of C1–C4 on GS decreased in the order C4H10 > C3H8 > C2H6 > CH4.
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
PETROLEUM SCIENCE AND TECHNOLOGY
·
2025
·
IF 1.4
Xia Zhong,Zihong Dong,Changsong Liu,Xin Pei,Hao Shi,Hua Dong
In sour gas reservoirs exploitation, liquid sulfur deposited in the formation could block natural gas passage channels, severely reducing gas field production. To address this problem, we successfully regulate the wettability of liquid sulfur on rock surfaces by modifying them with alkoxysilanes. It is found that enhancing the sulfophobicity of the rock surface significantly reduces the difficulty of gas-phase breakthrough of channel blockage caused by liquid sulfur deposition. During the simulated gas flooding process, the liquid sulfur recovery rate in neutral and sulfophobic rocks is increased by 48.3% and 124.4%, respectively, compared with untreated natural sulfophilic rocks, resulting in 29.3% and 50.0% increase in porosity of the rocks after flooding, respectively. These results indicate that the modified rock surface, especially sulfophobic rock surface, could effectively alleviate the blockage of gas production channels caused by liquid sulfur deposition. Mechanisms revealed by visualized experimental results show that in gas flooding in more sulfophobic cores, the swept area of gas phase is larger and the amount of residual sulfur in the swept area is less, so the sulfur recovery rate is higher than untreated sulfophilic rock, and the blockage caused by liquid sulfur in the cores could be effectively reduced.
研究领域:
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Huang Liu,Yangfei Liu,Minghao Liu,Hailong Liu
Water/diesel-cyclopentylamine and water/diesel-cyclopentanone emulsions were used to store natural gas during hydrate formation. First, cyclopentylamine (-amine) and cyclopentanone (-anone) were tested as thermodynamic promoters for CH4 hydrate formation in water/diesel (w/o) emulsions. The kinetics of CH4 hydrate formation in the w/o-amine and w/o-anone emulsions were then investigated. It was found that the promotional effect of both cyclopentylamine and cyclopentanone on CH4 storage in the hydrate phase was much better than that of cyclopentane, with the highest gas storage amount reaching 201.7 m3/m3, which is close to the ideal value (220 m3/m3), and the water-to-hydrate conversion ratio was higher than 90%. The main hydration reaction process was completed in 50 min, with the reaction rate reaching 2.3 mmol/min, which is higher than that reported for aqueous solutions. It should be noted that this was the first time that cyclopentylamine was tested and it showed good thermodynamic and kinetic stimulation effects on gas hydrate formation. The suitable CH4 hydrate formation conditions including the additional amount of promoters, temperature, pressure, and water cut range were determined to be approximately 20 wt %, 274.15–278.15 K, 5.0–6.0 MPa, and 20 wt %, respectively. The storage and transport pressure for the formed hydrate products could be decreased to less than 1 MPa. The significant gas storage amount was further supported by laser Raman analysis, which confirmed that the CH4 molecules were trapped in the small and large cages of the formed SII hydrate. Meanwhile, the formed hydrate/diesel slurries exhibited good dispersion features.
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
FUEL
·
2024
·
IF 6.7
Shikun Tong,Yuemeng Ren,Kele Yan,Yanxin Jin,Pengfei Li,Jianbo Zhang,Zhiyuan Wang
The coupling deposition and plugging caused by hydrate formation and wax precipitation during the development of deep water natural gas resources bring new industrial challenges and theoretical difficulty. We designed a single-pass pipeline with two types to investigate deposition behavior and systematically performed the coupling deposition and plugging of hydrate and wax experiments in gas–liquid annular flow . The experimental results illustrate that the single solid phase of hydrate is covered layer sheet deposition, while the coupling solid phase of hydrate and wax is bulk aggregations arch bridge deposition. Meanwhile, the natural eddy zone in reducing pipeline accelerates coupling solid particles deposition. Our finds provided the first knowledge on the double effect that wax crystals inhibit particles adhesion and gel network increases aggregations arch bridge blockage. For the low water content in emulsion system, the gel network provides gathering place for hydrate particles, and the arch bridge structure formed by aggregations accelerates the pipeline blockage. The plugging time is shortened by up to 72.6% with the wax concentration increase from 0 wt% to 3 wt%. For the high water content in emulsion system, the majority of wax crystals adsorbed on the hydrate particles and reduce particles cohesion force, which increase the plugging time. Combined with the microscopic morphology evolution perspective of hydrate particles coupled wax, the coupling deposition of hydrate and wax in gas–liquid annular flow has four stages: gas–liquid flow, coupling solid phase formation, coupling solid phase deposition and sloughing, and coupling solid phase plugging. This study can provide theoretical support and design basis for flow assurance program of deep water gas fields and low temperature natural gas transportation pipelines.
研究领域:
石油工程
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Gen Li,Zhonggang Wang
This paper presents a series of micro- and ultramicroporous polyaminals with BET surface areas up to 1304 m2 g–1, which are prepared from two triazine-based tetraamines and three dialdehydes or monoaldehyde through the A4 + B2 or A4 + B1 aminalization reaction. It is interesting to find that the para-substituted monomers are favorable to force the linking struts apart in the network to generate micropores (1.22 nm), whereas the meta-substituted monomers make the pores in the network squeezed by the twisted linking struts, resulting in the formation of ultramicropores (0.52 nm). Besides, the adsorption behaviors of the major components of natural gas, such as propane (C3H8), ethane (C2H6), methane (CH4), and carbon dioxide (CO2), are significantly different, strongly depending on the polarizabilities, critical temperatures, molecular sizes of gases, porosity parameters of polymers, and the interaction between gases and the polymer skeleton. At 298 K/1 bar, the polymers show high uptake for C3H8 (114.5 cm3 g–1) and C2H6 (84.2 cm3 g–1). Moreover, the adsorption selectivities of C3H8/CH4, C2H6/CH4, C3H8/C2H6, C3H8/CO2, C2H6/CO2, and CO2/CH4 also reach 296.3, 23.1, 9.0, 22.1, 4.1, and 5.0, respectively, exhibiting promising applications in adsorption/separation of C1–C3 hydrocarbons and stripping CO2 gas from natural gas under the ambient condition.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Entropy
·
2023
·Vol. 25
·期 2
·278
·
IF 2.7
Kefeng Yan,Jianyu Zhao,Xiaosen Li,Jingchun Feng,Zhiming Xia,Xuke Ruan
The swelling characteristics of porous media in the offshore natural gas hydrate reservoir have an important effect on the stability of the reservoir. In this work, the physical property and the swelling of porous media in the offshore natural gas hydrate reservoir were measured. The results show that the swelling characteristics of the offshore natural gas hydrate reservoir are influenced by the coupling of the montmorillonite content and the salt ion concentration. The swelling rate of porous media is directly proportionate to water content and the initial porosity, and inversely proportionate to salinity. Compared with water content and salinity, the initial porosity has much obvious influence on the swelling, which the swelling strain of porous media with the initial porosity of 30% is three times more than that of montmorillonite with the initial porosity of 60%. Salt ions mainly affect the swelling of water bound by porous media. Then, the influence mechanism of the swelling characteristics of porous media on the structural characteristics of reservoir was tentatively explored. It can provide a basic date and scientific basis for furthering the mechanical characteristics of the reservoir in the hydrate exploitation in the offshore gas hydrate reservoir.Keywords:natural gas hydrate;porous media;swelling characteristics;structural characteristics
研究领域:
地质学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2025
·
IF 5.3
Minghang Mao,Kefeng Yan,Chang Chen,Xiaosen Li,Zhaoyang Chen,Gang Li,Yi Wang
As a new type of clean energy, the exploitation of natural gas hydrate resources is key in global energy development of the future. A fundamental understanding of the heat transfer characteristics of natural gas hydrate reservoirs is critical for effective natural gas hydrate exploitation. In this work, the heat transfer characteristics of the sediments on marine natural gas hydrate reservoirs were investigated by using experiments and machine learning algorithms. The thermal conductivities of natural marine sediments from the marine natural gas hydrate reservoir and their primary porous media (quartz sand, Illite, and montmorillonite) were measured. The effects of the porous media component, the water content, the salt concentration, and the phase state change on the thermal conductivity of the reservoir were discussed. The experimental results show that the thermal conductivity of the reservoir depends not only on the inherent thermal conductivity of the porous media but also on the heat transfer mode between the components. The effective thermal conductivity of the porous media system is proportional to the water content and inversely proportional to the salt concentration in porous media. The swelling characteristics of porous media affect the heat transfer mode of the system, thus affecting the extent of change in the effective thermal conductivity with variations in the water content and salt concentration. During the phase transition process, the swelling characteristics of the porous media slow down the heat transfer process, an effect that can be mitigated by the swelling inhibition caused by salt. Additionally, the performances of six machine learning algorithms were evaluated using four evaluation indicators. Results show that the gradient boosted decision trees (GBDT) can yield good predicted values of the thermal conductivity of porous media in a marine natural gas hydrate. A feature importance analysis further reveals that the salt concentration and porous media components are the essential factors influencing the thermal conductivity of marine gas hydrate reservoirs.
研究领域:
能源地质学
·
机器学习应用
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Yubin Zhang,Zhengsong Qiu,Xin Zhao,Jiaxing Mu,Yongle Ma,Hanyi Zhong,Weian Huang,Yunfan Liu
The friction heat generated during the drilling process of natural gas hydrate bearing sediment (HBS) leads to the temperature of drilling fluid higher than the phase equilibrium temperature of hydrate, which induces hydrate decomposition and wellbore instability. In this work, tetrabutylammonium bromide (TBAB) and Nano-silica were microencapsulated by inverse emulsion interfacial polymerization. The effect of different preparation conditions on the encapsulation rate of microcapsules was characterized by differential scanning calorimetry (DSC), and the highest encapsulation rate was 62.2% with the melting enthalpy of 121.4 J/g. Polarizing microscope, scanning electron microscope (SEM) and transmission electron microscope (TEM) images were used to characterize the synthesis process and microstructure of microcapsules, which proved a quasi-spherical structure coated with Nano-silica. Furthermore, it was confirmed that the microcapsules also had good thermal conductivity , reliability and thermoregulating performance. The rheological parameters of drilling fluid with 5 wt% microcapsules increased slightly, and the filtration loss decreased, indicating good compatibility. In addition, it is convenient to adjust the melting temperature of the core materials by adding NaCl with different concentrations. This study is of guiding significance to realize intelligent temperature-control of hydrate bearing sediment during drilling.
研究领域:
材料科学
·
能源工程
·
地质工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Huang Liu,Huashi Li,Desong Yao,Ping Guo,Lianhui Wen
Due to the weak cementation of natural gas hydrate (NGH) reservoir in the seabed, during both the drilling and development processes, a multiphase (gas hydrate-sediments-seawater-natural gas mixture) flow is more likely to exist in the NGH reservoir and development wells, understand the natural gas hydrate particle dissociation kinetic in the hydrate-sediments/seawater slurries is important. In this work, first, a new NGH phase behavior research experimental apparatus contains a strong magnetic stirrer was built. By using this, we for the first time proposed to form NGH reservoir in the water saturated sands under stirring in the laboratory, which showed a much higher hydrate formation rate and water to hydrate conversation ratio than the usual static formation method. After that, the CH 4 hydrate-sands/seawater slurries were produced, the influence of pressures, temperatures, the size of sands, and stirring rates on CH 4 hydrate dissociation kinetic in the slurry were investigated. The dissociation rate of CH 4 hydrate-sands mixed particles markedly increased with decreasing operation pressure from 3 MPa to 0.1 MPa. The average dissociate rate reached 1762.57 mL/min at 0.1 MPa. It is interesting that unlike to the single NGH reservoir, no hydrate secondary formation and ice formation phenomenon arose in the hydrate-sands/seawater slurries during the CH 4 hydrate dissociation process. The increase of temperature and stirring rate substantially stimulated the dissociation of CH 4 hydrate particles in the slurry, while the sands’ size showed little effect. In addition, a high precision kinetic model for describing the dissociation of CH 4 hydrate in hydrate-sands/seawater slurries was built, in which the influence of pressure, temperature and stirring rate on the hydrate apparent dissociation rate constant was considered at the same time.
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
Journal of Cleaner Production
·
2024
·
IF 9.7
Wanru Feng,Jingya Zhang,Jianguo Mi,Junsu Jin,Guolei Xiang,Hong Meng,Shisen Xu
The synthesis of structured CO 2 adsorbents with high separation selectivity, strong stability, and low cost to meet industrial needs is very challenging. Here, we synthesized an ultra-stable Zn-MOF (Zn 2 (3-amion-1,2,4-triazolate) 2 (oxalate), Zn 2 (Atz) 2 Ox), and adopted an efficient in-situ growth strategy to produce millimeter-sized spherical Zn 2 (Atz) 2 Ox@AFP (Amino-Functionalization Poly(acrylates), AFP) composite. Due to the heterogeneous crystallization induced by the nanoscale crystal seeds and the confined space of AFP, the three-dimensional (3D) Zn 2 (Atz) 2 Ox bulk crystals transformed into 2D nanosheets with higher CO 2 adsorption efficiency and faster kinetics. Zn 2 (Atz) 2 Ox@AFP has a high affinity for CO 2 (2.05 mmol g −1 at 0.05 bar and 313 K) while exhibiting an inhibitory effect for N 2 (only 0.051 mmol g −1 at 1.0 bar and 313 K), leading to an excellent ideal adsorbed solution theory (IAST) selectivity (2990 for CO 2 /N 2 (5/95, v/v)). Interestingly, Zn 2 (Atz) 2 Ox@AFP exhibits a unique gating effect on CH 4 adsorption, which further extends its application range to natural gas purification. Dynamic breakthrough experiments confirmed that Zn 2 (Atz) 2 Ox@AFP can selectively capture CO 2 in the simulated CO 2 /N 2 (5/95) and CO 2 /CH 4 (5/95) mixed gases.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Hui-Ting Zheng,Liang Song,Le Yan,Xiao-Hong Xiong,Yu-Lin Lu,Cheng-Xia Chen,Mihail Barboiu,Zhang-Wen Wei,Ji-Jun Jiang,Cheng-Yong Su
The purification of methane from natural gas is extremely important for industrial applications. In this study, hierarchical porous material LIFM-Z1 with microporous cages and mesoporous hexagonal one-dimensional channels was successfully synthesized and evaluated. The results show that LIFM-Z1 can effectively separate CH 4 from the mixed gas containing CH 4 , C 2 H 6 , C 3 H 8 and n-C 4 H 10 . Single-component adsorption experiments revealed the selective adsorption ability of LIFM-Z1 for C 2 H 6 , C 3 H 8 , and n-C 4 H 10 , enabling a clear distinction between these components and CH 4 . This selectivity was further verified by dynamic breakthrough experiments. Theoretical analysis shows that the interaction between LIFM-Z1 and gas molecules mainly depends on the synergistic effect of C–H⋯O hydrogen bond and C–H⋯C van der Waals force. The results highlight the potential of utilizing 3D linkers to enhance the inner wall interaction with CH 4 and its related gases in MOF construction. These characteristics of LIFM-Z1 not only successfully demonstrate the potential of separation and purification of natural gas with high efficiency, but also show its broad application prospects in the actual natural gas processing.
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
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yufang Wu,Zewei Liu,Junjie Peng,Xun Wang,Xin Zhou,Zhong Li
Here, we reported a strategy for channel methylation to construct a robust ultramicroporous metal–organic framework (MOF) Ni(TMBDC)(DABCO)0.5 through hydrothermal synthesis method and investigated its adsorption performance for recovering ethane (C2) and propane (C3) from natural gas. The as-synthesized Ni(TMBDC)(DABCO)0.5 featured ultramicroporosity with a uniform pore size of 0.5 nm. The resulting sample showed a strong adsorption interaction with C3H8 and C2H6, and its C3H8 adsorption capacity at a low pressure of 1 kPa was up to 2.80 mmol/g and its C2H6 adsorption capacity at a low pressure of 10 kPa reached as high as 2.93 mmol/g, exhibiting strong binding affinity for ethane and propane. The enhanced adsorption can be attributed to the presence of the dense and accessible methyl and methylene groups in the channels of the sample. Grand Canonical Monte Carlo (GCMC) simulations also confirmed that the methylene groups from the DABCO pillar and the methyl groups from the TMBDC ligand play an important role in enhancing the adsorption of ethane and propane. Its ideal adsorbed solution theory (IAST)-predicted selectivity of C2H6/CH4 reached unprecedentedly 29, much higher than most of the reported data for MOFs. The stability test confirmed that the crystal structure of Ni(TMBDC)(DABCO)0.5 still remained intact after it was exposed to moist air with a relative humidity of 100% for days. The breakthrough experiment demonstrated that the CH4/C2H6/C3H8 ternary mixture was completely separated using a fixed bed of Ni(TMBDC)(DABCO)0.5 at ambient temperature, showing a great potential for recovering the low content of ethane and propane from natural gas.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）