Article
Energy & Fuels
Xuebing Zhou, Qian Zhang, Zhen Long, Deqing Liang
Summary: The study found that the addition of KHIs significantly reduced the self-preservation effect of CH4 hydrates and increased the dissociation rate of hydrates. PVP-K90 and PVCap had different mechanisms of action, with the former embedded in small ice crystals inhibiting the connections of plate-like ice crystals, and the latter inducing dendritic growth of CH4 hydrates, leading to an increase in specific surface area.
Article
Energy & Fuels
Ajay Suri, Ankur Singh
Summary: This paper investigates the synergy between three kinetic hydrate inhibitors (KHIs) and a common solvent. The results show that the performance of the inhibitors is greatly enhanced when blended with the solvent, with the best performance achieved within a certain concentration range. The blends outperform the individual inhibitors and are environmentally friendly.
Article
Energy & Fuels
Ankur Singh, Ajay Suri
Summary: Before injecting any kinetic hydrate inhibitor (KHI) into a flow line, it is necessary to dissolve the KHI, which is usually a polymer, in a suitable solvent such as water, methanol, or glycol. This study investigates the synergistic effect of three KHIs (PVP, PVCap, and Pectin) with monoethylene glycol (MEG) as the solvent. The results show that blending MEG with the KHIs significantly enhances hydrate inhibition, with Pectin-MEG blend demonstrating the best performance.
Article
Energy & Fuels
Caifeng Yang, Mucong Zi, Guozhong Wu, Xue Zou, Kai Liu, Daoyi Chen
Summary: This study evaluated the influence of kinetic hydrate inhibitor (KHI) on methane - propane hydrate formation kinetics under different subcooling and concentration conditions. It proposed a "concentration effect" concept that highlighted the nonmonotonic relationship between KHI performance and concentration. Two hypotheses were proposed to explain this phenomenon, and the results showed that the concentration effect became less obvious under certain experimental conditions.
Article
Thermodynamics
Yanzhen Liu, Qingping Li, Xin Lv, Lei Yang, Junfeng Wang, Fen Qiao, Jiafei Zhao, Huiping Qi
Summary: In deep-sea oil and gas transportation, kinetic inhibitors are used to prevent gas hydrates from clogging pipelines. However, clay particles can adsorb these inhibitors, reducing their effectiveness. This study found that 1:1-type layered silicates can only adsorb inhibitors through the surface, while 2:1-type layered silicates can adsorb inhibitors through both surface and intercalation. The adsorbed inhibitors make the clay particles aggregate and settle, weakening their inhibitory effect on gas hydrates.
Review
Energy & Fuels
Qian Zhang, Malcolm A. Kelland, Hailong Lu
Summary: Kinetic hydrate inhibitors (KHIs) have been used for decades to solve the hydrate formation problem in oil and gas flowlines. Traditional amide-based polymers have been supplemented by non-amide KHIs, including amine-based, amine oxide-based, phosphonate-based, sulfonate-based, hydroxyl-based, acrylate-based, and urethane-based KHIs. The inhibition performance of non-amide polymers is related to their chemical structures and the hydrophobic groups connected to the functional groups. Non-amide KHIs with suitable hydrophobic groups show better inhibition performance than some commercial amide-containing KHIs.
Article
Thermodynamics
Zhen Long, Xuebing Zhou, Zhilin Lu, Deqing Liang
Summary: In this study, a series of copolymers of NVCap with NIPAM were synthesized and their inhibition performance on CH4 hydrate formation was investigated. The results showed that these copolymers were more effective in inhibiting the formation and growth of hydrates compared to NVCap homopolymer under the same conditions. The copolymers with the lowest molecular weight exhibited the best inhibition performance. Raman data revealed that the copolymers preferred to hinder CH4 molecules from entering large hydrate cages.
Article
Energy & Fuels
Hanie Mohsenzade, Shima Foroutan, Ali Dashti, Navid Ramezanian, Hadi Roosta
Summary: In this study, poly(N-vinylcaprolactam)s were synthesized as potent kinetic hydrate inhibitors, with modifications such as 3-mercaptopropionic acid and mercaptoacetic acid showing superior performance in reducing the growth rate of structure I and structure II hydrates. The synthesized polymers also outperformed commercial products in delaying induction time and increasing relative inhibition power values.
Article
Energy & Fuels
Myungchul Park, Younghoon Sohn, Hyunho Kim, Ki-Heum Park, Mincheol Ryu, Yutaek Seo
Summary: The performance of Luvicap EG was investigated with varying pH conditions and the addition of MEG. Results showed that Luvicap deteriorated at high pH conditions, while MEG effectively slowed down the growth rate for acid and neutral solutions. Under high pH and high impeller speed, Luvicap EG performed well with an enhanced effect by the addition of MEG.
Article
Chemistry, Multidisciplinary
Li Wan, De Qing Liang
Summary: Amphiphilic block copolymers (PVCap-b-PCL) containing different ratio of PCL and PVCap were synthesized and showed better performance than PVCap in methane hydrate inhibition experiments, providing longer induction time. These copolymers have potential as environmentally friendly hydrate inhibitors by adjusting the ratio of PCL to PVCap.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Engineering, Environmental
Yu-Hsuan Ho, Yau Zu Khoo, Yan-Ping Chen, Ryo Ohmura, Li-Jen Chen
Summary: This study investigates the thermodynamic and kinetic influence of polyethylenimine (PEI) on the formation of methane and carbon dioxide hydrates. It is found that PEI acts as a thermodynamic inhibitor, inhibiting the formation of hydrates. However, it has different effects on methane and carbon dioxide hydrates kinetically, inhibiting methane hydrate formation and promoting carbon dioxide hydrate formation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Jinxiang Liu, Wenxiu Zhang, HuanHua Wu, Zhigang Gao, Yiwei Feng, Shengli Liu
Summary: In this study, the adsorption of kinetic hydrate inhibitors (KHIs) on metal surfaces was investigated using first-principles computational method. It was found that KHIs preferentially adsorb onto the Fe surface and undergo electron transfer with the Fe surface, while acting as electron donors to the Fe3O4 surface. Hydrophobic interaction plays a dominant role in adsorption affinity, and electron transfer enhances adsorption stability. Additionally, the adsorption affinity of four poly(N-vinyl lactam)s with different ring sizes was compared, with PVCap exhibiting the strongest adsorption strength on Fe surface.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Energy & Fuels
Yu Liu, Jiateng Duan, Dianqiang Xu, Jiawei Chu, Shi Shen, Jiafei Zhao, Lanlan Jiang
Summary: The phase equilibria of different systems were investigated, and it was found that mineral oil and MEG shifted the phase equilibrium to different directions. The hydrate inhibition performance and generation characteristics of the composite formulation of Luvicap 55w and MEG were studied, and it was observed that increasing subcooling decreased the induction time and increased gas consumption. The induction time increased with increasing MEG concentration, confirming the synergistic effect of MEG in the oil-water emulsion for Luvicap 55w.
ENERGY SCIENCE & ENGINEERING
(2023)
Article
Chemistry, Physical
Liwei Cheng, Zhi Li, Jinlong Cui, Ran Zhu, Jia Li, Huibo Qin, Bei Liu, Guangjin Chen, Fulong Ning
Summary: As an important hydrate control method, kinetic hydrate inhibitors (KHIs) have gained extensive attention in the oil and gas industry. The addition of synergistic reagents with high efficiency to improve the inhibition performance of KHIs is of great significance for the prevention and treatment of hydrates.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Energy & Fuels
Yau Zu Khoo, Yu-Hsuan Ho, Kuang-Yu Chang, Yan-Ping Chen, Li-Jen Chen
Summary: This study determined the dissociation conditions of methane hydrates influenced by reline DES, urea, and choline chloride, and found that these additives demonstrated an inhibitory effect on methane hydrate formation.
Article
Energy & Fuels
Yingna Du, Chen Huang, Wei Jiang, Qiangwei Yan, Yongfei Li, Gang Chen
Summary: In this study, anionic surfactants modified hydrotalcite was used as a flow improver for crude oil under low-temperature conditions. The modified hydrotalcite showed a significant viscosity reduction effect on crude oil. The mechanism of the modified hydrotalcite on viscosity and pour point of crude oil was explored through characterization and analysis of the modified hydrotalcite and oil samples.
Article
Energy & Fuels
Mohammad Saeid Rostami, Mohammad Mehdi Khodaei
Summary: In this study, a hybrid structure, MIL-53(Al)@MWCNT, was synthesized by combining MIL-53(Al) particles and -COOH functionalized multi-walled carbon nanotube (MWCNT). The hybrid structure was then embedded in a polyethersulfone (PES) polymer matrix to prepare a mixed matrix membrane (MMM) for CO2/CH4 and CO2/N2 separation. The addition of MWCNTs prevented MIL-53(Al) aggregation, improved membrane mechanical properties, and enhanced gas separation efficiency.
Article
Energy & Fuels
Yunlong Li, Desheng Huang, Xiaomeng Dong, Daoyong Yang
Summary: This study develops theoretical and experimental techniques to determine the phase behavior and physical properties of DME/flue gas/water/heavy oil systems. Eight constant composition expansion (CCE) tests are conducted to obtain new experimental data. A thermodynamic model is used to accurately predict saturation pressure and swelling factors, as well as the phase boundaries of N2/heavy oil systems and DME/CO2/heavy oil systems, with high accuracy.
Article
Energy & Fuels
Morteza Afkhamipour, Ebad Seifi, Arash Esmaeili, Mohammad Shamsi, Tohid N. Borhani
Summary: Non-conventional amines are being researched worldwide to overcome the limitations of traditional amines like MEA and MDEA. Adequate process and thermodynamic models are crucial for understanding the applicability and performance of these amines in CO2 absorption, but studies on process modeling for these amines are limited. This study used rate-based modeling and Deshmukh-Mather method to model CO2 absorption by DETA solution in a packed column, validated the model with experimental data, and conducted a sensitivity analysis of mass transfer correlations. The study also compared the CO2 absorption efficiency of DETA solution with an ionic solvent [bmim]-[PF6] and highlighted the importance of finding optimum operational parameters for maximum absorption efficiency.
Article
Energy & Fuels
Arastoo Abdi, Mohamad Awarke, M. Reza Malayeri, Masoud Riazi
Summary: The utilization of smart water in EOR operations has gained attention, but more research is needed to understand the complex mechanisms involved. This study investigated the interfacial tension between smart water and crude oil, considering factors such as salt, pH, asphaltene type, and aged smart water. The results revealed that the hydration of ions in smart water plays a key role in its efficacy, with acidic and basic asphaltene acting as intrinsic surfactants. The pH also influenced the interfacial tension, and the aged smart water's interaction with crude oil depended on asphaltene type, salt, and salinity.
Article
Energy & Fuels
Dongao Zhu, Kun Zhu, Lixian Xu, Haiyan Huang, Jing He, Wenshuai Zhu, Huaming Li, Wei Jiang
Summary: In this study, cobalt-based metal-organic frameworks (Co-based MOFs) were used as supports and co-catalysts to confine the NHPI catalyst, solving the leaching issue. The NHPI@Co-MOF with carboxyl groups exhibited stronger acidity and facilitated the generation of active oxygen radicals O2•, resulting in enhanced catalytic activity. This research provides valuable insights into the selection of suitable organic linkers and broadens the research horizon of MOF hybrids in efficient oxidative desulfurization (ODS) applications.
Article
Energy & Fuels
Edwin G. Hoyos, Gloria Amo-Duodu, U. Gulsum Kiral, Laura Vargas-Estrada, Raquel Lebrero, Rail Munoz
Summary: This study investigated the impact of carbon-coated zero-valent nanoparticle concentration on photosynthetic biogas upgrading. The addition of nanoparticles significantly increased microalgae productivity and enhanced nitrogen and phosphorus assimilation. The presence of nanoparticles also improved the quality of biomethane produced.
Article
Energy & Fuels
Yao Xiao, Asma Leghari, Linfeng Liu, Fangchao Yu, Ming Gao, Lu Ding, Yu Yang, Xueli Chen, Xiaoyu Yan, Fuchen Wang
Summary: Iron is added as a flocculant in wastewater treatment and the hydrothermal carbonization (HTC) of sludge produces wastewater containing Fe. This study investigates the effect of aqueous phase (AP) recycling on hydrochar properties, iron evolution and environmental assessment during HTC of sludge. The results show that AP recycling process improves the dewatering performance of hydrochar and facilitates the recovery of Fe from the liquid phase.
Article
Energy & Fuels
He Liang, Tao Wang, Zhenmin Luo, Jianliang Yu, Weizhai Yi, Fangming Cheng, Jingyu Zhao, Xingqing Yan, Jun Deng, Jihao Shi
Summary: This study investigated the influence of inhibitors (carbon dioxide, nitrogen, and heptafluoropropane) on the lower flammability limit of hydrogen and determined the critical inhibitory concentration needed for complete suppression. The impact of inhibitors on explosive characteristics was evaluated, and the inhibitory mechanism was analyzed with chemical kinetics. The results showed that with the increase of inhibitor quantity, the lower flammability limit of hydrogen also increased. The research findings can contribute to the safe utilization of hydrogen energy.
Article
Energy & Fuels
Zonghui Liu, Zhongze Zhang, Yali Zhou, Ziling Wang, Mingyang Du, Zhe Wen, Bing Yan, Qingxiang Ma, Na Liu, Bing Xue
Summary: In this study, high-performance solid catalysts based on phosphotungstic acid (HPW) supported on Zr-SBA-15 were synthesized and evaluated for the one-pot conversion of furfural (FUR) to γ-valerolactone (GVL). The catalysts were characterized using various techniques, and the ratio of HPW and Zr was found to significantly affect the selectivity of GVL. The HPW/Zr-SBA-15 (2-4-15) catalyst exhibited the highest GVL yield (83%) under optimized reaction conditions, and it was determined that a balance between Bronsted acid sites (BAS) and Lewis acid sites (LAS) was crucial for achieving higher catalytic performance. The reaction parameters and catalyst stability were also investigated.
Article
Energy & Fuels
Michael Stoehr, Stephan Ruoff, Bastian Rauch, Wolfgang Meier, Patrick Le Clercq
Summary: As part of the global energy transition, an experimental study was conducted to understand the effects of different fuel properties on droplet vaporization for various conventional and alternative fuels. The study utilized a flow channel to measure the evolution of droplet diameters over time and distance. The results revealed the temperature-dependent effects of physical properties, such as boiling point, liquid density, and enthalpy of vaporization, and showed the complex interactions of preferential vaporization and temperature-dependent influences of physical properties for multi-component fuels.
Article
Energy & Fuels
Yuan Zhuang, Ruikang Wu, Xinyan Wang, Rui Zhai, Changyong Gao
Summary: Through experimental validation and optimization of the chemical kinetic model, it was found that methanol can accelerate the oxidation reaction of ammonia, and methanol can be rapidly oxidized at high concentration. HO2 was found to generate a significant amount of OH radicals, facilitating the oxidation of methanol and ammonia. Rating: 7.5/10.
Article
Energy & Fuels
Radwan M. EL-Zohairy, Ahmed S. Attia, A. S. Huzayyin, Ahmed I. EL-Seesy
Summary: This paper presents a lab-scale experimental study on the impact of diethyl ether (DEE) as an additive to waste cooking oil biodiesel with Jet A-1 on combustion and emission features of a swirl-stabilized premixed flame. The addition of DEE to biodiesel significantly affects the flame temperature distribution and emissions. The W20D20 blend of DEE, biodiesel, and Jet A-1 shows similar flame temperature distribution to Jet A-1 and significantly reduces UHC, CO, and NOx emissions compared to Jet A-1.
Article
Energy & Fuels
Jiang Bian, Ziyuan Zhao, Yang Liu, Ran Cheng, Xuerui Zang, Xuewen Cao
Summary: This study presents a novel method for ammonia separation using supersonic flow and develops a mathematical model to investigate the condensation phenomenon. The results demonstrate that the L-P nucleation model accurately characterizes the nucleation process of ammonia at low temperatures. Numerical simulations also show that increasing pressure and concentration can enhance ammonia condensation efficiency.
Article
Energy & Fuels
Shiyuan Pan, Xiaodan Shi, Beibei Dong, Jan Skvaril, Haoran Zhang, Yongtu Liang, Hailong Li
Summary: Integrating CO2 capture with biomass-fired combined heat and power (bio-CHP) plants is a promising method for achieving negative emissions. This study develops a reliable data-driven model based on the Transformer architecture to predict the flowrate and CO2 concentration of flue gas in real time. The model validation shows high prediction accuracy, and the potential impact of meteorological parameters on model accuracy is assessed. The results demonstrate that the Transformer model outperforms other models and using near-infrared spectral data as input features improves the prediction accuracy.