Journal of Supercritical Fluids最新文献

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The development of GelMA based hydrogels combined with acellular small intestinal submucosa for peripheral nerve injuries GelMA基水凝胶联合脱细胞小肠粘膜下层治疗周围神经损伤的研究
IF 4.4 3区 工程技术
Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-11-12 DOI: 10.1016/j.supflu.2025.106842
Zeynep Caglar , Busra Kilic , Halil Murat Aydin
{"title":"The development of GelMA based hydrogels combined with acellular small intestinal submucosa for peripheral nerve injuries","authors":"Zeynep Caglar ,&nbsp;Busra Kilic ,&nbsp;Halil Murat Aydin","doi":"10.1016/j.supflu.2025.106842","DOIUrl":"10.1016/j.supflu.2025.106842","url":null,"abstract":"<div><div>Peripheral nerve injuries are a major public health concern. The slow self-regeneration of the complex structure of the peripheral nervous system significantly impacts functional recovery. For this reason, studies on nerve tissue engineering for peripheral nerve repair are critical. Here, we constructed a gelMA-based decellularized SIS hybrid construct to promote functional regeneration after peripheral nerve injury. A supercritical carbon dioxide (scCO<sub>2</sub>) decellularization protocol was developed for bovine small intestinal submucosa (SIS) decellularization. A conventional method involving the combinations of physical, chemical, and enzymatic treatments was used for evaluating the efficiency of the scCO<sub>2</sub> technology for SIS decellularization. The efficiency of decellularization methods was evaluated using both qualitative and quantitative analyses. In this regard, it was shown that the scCO<sub>2</sub> technology was an efficient and high-yielding method for the decellularization of SIS. Then, SIS was incubated with gelMA solutions to obtain hybrid hydrogels. FT-IR and SEM were used to prove the success of hybrid tissue scaffold synthesis as well as to investigate structural changes. The water retention capacity, degradation properties and mechanical strength of the hybrid scaffolds were investigated and compared with the acellular SIS. Lastly the ability of hybrid membranes to induce neural cell adhesion and proliferation was evaluated via <em>in vitro</em> cell culture of Schwann cells in terms of cell viability, proliferation and morphological changes.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106842"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145509470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Silica-alumina aerogels functionalized with amino-groups for the adsorption of CO2 氨基功能化二氧化硅-氧化铝气凝胶吸附co2
IF 4.4 3区 工程技术
Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-11-08 DOI: 10.1016/j.supflu.2025.106835
Marta Gallo, Marco Armandi, Fabiana Mangano, Silvia Ronchetti, Mauro Banchero, Luigi Manna
{"title":"Silica-alumina aerogels functionalized with amino-groups for the adsorption of CO2","authors":"Marta Gallo,&nbsp;Marco Armandi,&nbsp;Fabiana Mangano,&nbsp;Silvia Ronchetti,&nbsp;Mauro Banchero,&nbsp;Luigi Manna","doi":"10.1016/j.supflu.2025.106835","DOIUrl":"10.1016/j.supflu.2025.106835","url":null,"abstract":"<div><div>To overcome climate challenges, emerging CO<sub>2</sub> capture technologies focus on innovative solid sorbents, like aerogels. Silica aerogels, in particular, have emerged as an exceptional class of materials with unique properties even though their adsorption selectivity towards CO<sub>2</sub>, and their thermal and mechanical properties are limited. In this research, a hybrid silica-alumina aerogel has been prepared, to merge the elevated surface area typical of silica with the basic character (favorable to CO<sub>2</sub> adsorption) and the high thermal and mechanical resistance typical of alumina. For the first time, these silica-alumina aerogels were functionalized with 3-aminopropyltriethoxysilane (APTES) amino groups through a one-pot process. This approach was chosen to directly introduce functional groups during gel formation, reducing the number of post-synthesis steps. The functionalization with amino groups aims to strengthen the interactions with CO₂ molecules via acid–base interactions, thus enhancing adsorption capacity and selectivity. Three samples with increasing APTES content as well as a reference without any functionalization were prepared and characterized in terms of physico-chemical and adsorption properties. The results of CO<sub>2</sub> and N<sub>2</sub> adsorption tests as well as <em>in situ</em> FTIR suggest that low functionalization does not confer a significant advantage in CO<sub>2</sub> capture. Higher APTES contents, instead, lead to a significant increase in the total quantity of adsorbed CO<sub>2</sub> and in higher selectivity over N<sub>2</sub> (calculated according to the Ideal Adsorbed Solution Theory). Moreover, also the strength of interaction increases, since not only physisorption, but also chemisorption takes place.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106835"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145473167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A mechanistic model for X65 steel corrosion in supercritical CO2 flow and phase change pipeline transportation environment X65钢在超临界CO2流动和相变管道输送环境中的腐蚀机理模型
IF 4.4 3区 工程技术
Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-10-29 DOI: 10.1016/j.supflu.2025.106825
Guangyu Liu , Xinxin Fan , Cailin Wang , Junwen Chen , Shengzhu Zhang , Mingzhuo Li , Qihui Hu , Yuxing Li
{"title":"A mechanistic model for X65 steel corrosion in supercritical CO2 flow and phase change pipeline transportation environment","authors":"Guangyu Liu ,&nbsp;Xinxin Fan ,&nbsp;Cailin Wang ,&nbsp;Junwen Chen ,&nbsp;Shengzhu Zhang ,&nbsp;Mingzhuo Li ,&nbsp;Qihui Hu ,&nbsp;Yuxing Li","doi":"10.1016/j.supflu.2025.106825","DOIUrl":"10.1016/j.supflu.2025.106825","url":null,"abstract":"<div><div>Phase transitions in long-distance CO<sub>2</sub> pipelines are inevitable, yet their coupled effects on corrosion under real pipeline flow conditions remain inadequately understood. This study systematically investigates the influence of phase transition and flow velocity on the corrosion mechanisms of X65 steel in CO<sub>2</sub> pipelines through corrosion experiments, microscopic characterization of corrosion product films, and theoretical modeling of droplet spreading and pit development. The findings reveal that flow conditions transform the dominant corrosion mode in the phase transition environment from pitting corrosion in static conditions to uniform corrosion in dynamic conditions. This shift primarily arises from variations in flow rate and CO<sub>2</sub> density, which alter droplet size distribution on the steel surface. Most droplets become smaller than the critical radius required for downward pit propagation, leading to lateral pit expansion rather than deepening. Consequently, uniform corrosion is intensified, while pitting corrosion is mitigated. Furthermore, changes in wall shear stress and droplet dynamics during phase transitions disrupt the structural integrity of corrosion products, further exacerbating uniform corrosion.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106825"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145383119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Towards sustainable extraction of bioactive compounds from guayusa (Ilex guayusa): A comparative study on compressed fluids’ performance 瓜柳草生物活性化合物的可持续提取:压缩流体性能的比较研究
IF 4.4 3区 工程技术
Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-10-06 DOI: 10.1016/j.supflu.2025.106801
Minxing Zhang , Lidia Montero , Jose A. Mendiola , Elena Ibáñez
{"title":"Towards sustainable extraction of bioactive compounds from guayusa (Ilex guayusa): A comparative study on compressed fluids’ performance","authors":"Minxing Zhang ,&nbsp;Lidia Montero ,&nbsp;Jose A. Mendiola ,&nbsp;Elena Ibáñez","doi":"10.1016/j.supflu.2025.106801","DOIUrl":"10.1016/j.supflu.2025.106801","url":null,"abstract":"<div><div><em>Ilex guayusa</em>, a traditional Amazonian plant rich in caffeine and polyphenols, has attracted interest for its antioxidant and neuroprotective properties. This study evaluates the potential of green compressed fluid extraction techniques to recover bioactive compounds from <em>I. guayusa</em> leaves using environmentally friendly solvents: pressurized liquid extraction (PLE), gas-expanded liquids (GXL), and supercritical fluid extraction (SFE). A mixture design approach combining CO2, ethanol, water, and 2-methyltetrahydrofuran (2-MTHF) in different proportions as solvents was applied to optimize extraction conditions. Among the tested methods, GXL extraction yielded the highest phenolic content and demonstrated superior antioxidant (ABTS and DPPH) and anti-inflammatory (inhibition of lipoxigenase, LOX) activities. Conventional water maceration showed stronger cholinesterase inhibition, suggesting complementary neuroprotective potential. Chemical profiling (HPLC-DAD-ESI-MS/MS) of the optimized extract confirmed the presence of phenolic acids and flavonoids associated with the observed bioactivities. These findings highlight the effectiveness of compressed fluid-based green extraction for obtaining multifunctional phytochemicals from <em>I. guayusa</em>, with promising applications in functional foods and nutraceuticals.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106801"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145271493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fluidization characteristics of supercritical fluidized beds: A comprehensive review 超临界流化床流态化特性综述
IF 4.4 3区 工程技术
Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-10-01 DOI: 10.1016/j.supflu.2025.106799
Yanna Li , Liangzhao Sun , Gongpeng Wu , Yan He
{"title":"Fluidization characteristics of supercritical fluidized beds: A comprehensive review","authors":"Yanna Li ,&nbsp;Liangzhao Sun ,&nbsp;Gongpeng Wu ,&nbsp;Yan He","doi":"10.1016/j.supflu.2025.106799","DOIUrl":"10.1016/j.supflu.2025.106799","url":null,"abstract":"<div><div>Fluidized beds (FBs) are widely used in many industrial applications, and continuous improvement of their performance is imperative. However, the inherent limitations of gas-solid FBs, particularly concerning fluidization characteristics, mass transfer efficiency, and operational stability, cannot be adequately addressed solely through structural optimization. Accordingly, fluidized bed reactors using supercritical fluids (SCFs) as fluidizing agents have attracted considerable attention in recent years due to their unique physicochemical properties. Supercritical fluidized beds offer higher fluidization uniformity, reduced bubble diameter, improved particle mixing, and greater bed expansion compared to conventional gas-solid FBs. This review comprehensively examines the advancements in supercritical fluidization technology, with emphasis on supercritical water and carbon dioxide. The main findings indicate that operational parameters, including temperature, pressure, and superficial fluid velocity, exert a substantial influence on fluidization characteristics by modulating the properties of the SCF. Particle properties, including diameter, shape, and size distribution, significantly affect minimum fluidization velocity, bubble dynamics, and bed homogeneity. Predictive correlations for critical parameters are discussed, highlighting their role in reactor design and optimization. Despite notable progress, challenges persist, such as limited experimental data and the limited applicability of traditional fluidized bed testing methodologies to the supercritical domain. This review is of considerable significance for the optimized design of supercritical fluidized beds and provides direction for future applications of supercritical fluidized beds across a wider range of fields.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106799"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145271492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Production of teriflunomide-hydroxypropyl methyl cellulose composites utilizing the Gas Antisolvent (GAS) process and Box-Behnken Design 利用气体抗溶剂(Gas)工艺和Box-Behnken设计生产特氟米特-羟丙基甲基纤维素复合材料
IF 4.4 3区 工程技术
Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-10-15 DOI: 10.1016/j.supflu.2025.106820
Mahshid Askarizadeh , Nadia Esfandiari , Bizhan Honarvar , Seyed Ali Sajadian , Amin Azdarpour
{"title":"Production of teriflunomide-hydroxypropyl methyl cellulose composites utilizing the Gas Antisolvent (GAS) process and Box-Behnken Design","authors":"Mahshid Askarizadeh ,&nbsp;Nadia Esfandiari ,&nbsp;Bizhan Honarvar ,&nbsp;Seyed Ali Sajadian ,&nbsp;Amin Azdarpour","doi":"10.1016/j.supflu.2025.106820","DOIUrl":"10.1016/j.supflu.2025.106820","url":null,"abstract":"<div><div>This study aimed to enhance the dissolution rate of Teriflunomide, a medication for multiple sclerosis that exhibits low water solubility despite its high permeability. To tackle this issue, the Gas Antisolvent technique was utilized to decrease the particle size of Teriflunomide. Three critical parameters were examined: pressure (10, 13, and 16 MPa), temperature (308, 318, and 328 K), and the ratio of Teriflunomide to Hydroxypropyl methylcellulose (1, 5, and 9 w/w). The optimization of these variables was carried out using the Box-Behnken Design method. The coprecipitation of Teriflunomide with Hydroxypropyl methylcellulose was investigated under optimal conditions (16 MPa, 315 K, and a 1 w/w ratio). DSC, XRD, FTIR, SEM, and DLS were employed to examine and characterize the thermal stability, crystallinity, and to assess the shape and position of the absorption peaks, as well as the morphology and particle size. The resulting TEF-HPMC nanoparticles were measured at 561 ± 25 nm, which was found to be significantly smaller than the original sample (125 ± 28 μm).</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106820"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145323371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical investigations on transport properties for SCO2 flow in Gyroid structures with the pore-scale method 用孔隙尺度法研究SCO2在旋转结构中的输运特性
IF 4.4 3区 工程技术
Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-10-31 DOI: 10.1016/j.supflu.2025.106828
Wenpeng Hong, Jingwen Fan, Guilei Yue, Haoran Li, Xiaojuan Niu
{"title":"Numerical investigations on transport properties for SCO2 flow in Gyroid structures with the pore-scale method","authors":"Wenpeng Hong,&nbsp;Jingwen Fan,&nbsp;Guilei Yue,&nbsp;Haoran Li,&nbsp;Xiaojuan Niu","doi":"10.1016/j.supflu.2025.106828","DOIUrl":"10.1016/j.supflu.2025.106828","url":null,"abstract":"<div><div>Supercritical CO<sub>2</sub> (SCO<sub>2</sub>) has emerged as a promising coolant for transpiration cooling in combustion chamber liners. The cooling performance is strongly influenced by the transport properties of SCO<sub>2</sub> within porous media. However, the absence of accurate porosity-dependent correlations for customized porous structures has hindered the application of volume-averaged models, which are more appropriate for transpiration design. In this study, Gyroid porous structures with porosities ranging from 30 % to 42 % were reconstructed at the pore scale. Numerical simulations of heat and mass transfer were conducted to investigate the local transport behaviors of SCO<sub>2</sub>. Porosity-dependent correlations for permeability, Forchheimer coefficient, convective heat transfer, and effective thermal conductivity were derived from the pore-scale simulation data. The permeability increased exponentially with porosity, while the Forchheimer coefficient decreased linearly from approximately 6.7171 × 10<sup>4</sup> m⁻¹ to 3.4923 × 10<sup>3</sup> m⁻¹ . The effective thermal conductivity was found to require correction factors between 0.57 and 0.78. An empirical correlation for the surface-averaged Nusselt number (<em>Nu</em><sub>sf</sub>) was also proposed, incorporating correction terms to account for temperature-dependent thermophysical properties. These correlations were implemented into a volume-averaged model and validated through conjugate simulations. Comparisons with pore-scale results demonstrated that the LTNE-based volume-averaged model accurately predicts both temperature and velocity fields. Overall, this study presents a multiscale modeling framework for SCO₂ transport in Gyroid porous media and validated empirical correlations, addressing a critical gap in transpiration cooling design using the volume-averaged method.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106828"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145404737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Green sustainable eutectic solvent using supercritical CO2 for extraction composition from rice husk 利用超临界CO2萃取稻壳成分的绿色可持续共晶溶剂
IF 4.4 3区 工程技术
Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-11-14 DOI: 10.1016/j.supflu.2025.106843
Ahmed lbrahim, Mohamed Tarek, Zhi-En Xin, Ardila Hayu Tiwikrama
{"title":"Green sustainable eutectic solvent using supercritical CO2 for extraction composition from rice husk","authors":"Ahmed lbrahim,&nbsp;Mohamed Tarek,&nbsp;Zhi-En Xin,&nbsp;Ardila Hayu Tiwikrama","doi":"10.1016/j.supflu.2025.106843","DOIUrl":"10.1016/j.supflu.2025.106843","url":null,"abstract":"<div><div>Converting agricultural waste into useful materials through seeking effective and convenient routes is an important step toward shifting to sustainable energy. In this work, a deep eutectic solvent (DES) was prepared by mixing choline chloride (ChCl) as a hydrogen bond acceptor (HBA) and diethylene glycol (DEG) as a hydrogen bond donor (HBD) in a molar ratio of 1:8 to break down rice husk (RH) biomass. The RH was extracted using supercritical CO<sub>2</sub> pretreatment at <em>T</em> = 80 °C and 120 °C during the reaction times ranging from (2−24) h to determine the composition of cellulose, hemicellulose and lignin in the RH. The ChCl-DEG achieved successful selective separation of lignin and hemicellulose from lignocellulosic RH biomass with a delignification value of over 66 % at 120 °C after 24 h. The effect of supercritical carbon dioxide (scCO<sub>2</sub>) was investigated during the fractionation process of the RH. The results show that the use of scCO<sub>2</sub> decreased the delignification value, which can be attributed to the disturbance of the hydrogen bonds between the DES and the lignin composition structure, hindering the separation process. Morphological characterization using scanning electron microscopy (SEM) revealed significant changes on the surface of the treated RH, indicating the removal of lignin and hemicellulose from the biomass surface. Overall, the study demonstrates that ChCl-DEG is a promising, adaptable DES for environmentally friendly processing of plant materials.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106843"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145536504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on water hammer characteristics and protection measures of supercritical/dense CO2 pipelines 超临界/浓CO2管道水锤特性及防护措施研究
IF 4.4 3区 工程技术
Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-11-10 DOI: 10.1016/j.supflu.2025.106837
Qian Chen , Jian Jiao , Xiaoqin Xiong , Wenhui Zhang , Jianwei Ge , Xinze Li , Liukang Zhao , Xiaokai Xing
{"title":"Study on water hammer characteristics and protection measures of supercritical/dense CO2 pipelines","authors":"Qian Chen ,&nbsp;Jian Jiao ,&nbsp;Xiaoqin Xiong ,&nbsp;Wenhui Zhang ,&nbsp;Jianwei Ge ,&nbsp;Xinze Li ,&nbsp;Liukang Zhao ,&nbsp;Xiaokai Xing","doi":"10.1016/j.supflu.2025.106837","DOIUrl":"10.1016/j.supflu.2025.106837","url":null,"abstract":"<div><div>Pipeline transportation under supercritical and dense phases is commonly adopted for carbon dioxide (CO<sub>2</sub>) long-distance transportation due to its high transportation capacity and low energy consumption. When valves are accidentally shut off in CO<sub>2</sub> pipeline systems, there might exist phase transitions or local overpressure due to water hammer effects. In this paper, a rapid transient method is proposed by improved characteristic line algorithm to simulate dynamic behaviors of water hammer scenarios, and characteristics of phase transitions in CO<sub>2</sub> pipelines under water hammer scenarios are investigated. It was found that time-consuming by proposed method is about 4–10 times faster than that by implicit difference methods. Elevation differences have significant effects on operating pressure of CO<sub>2</sub> pipelines under water hammer scenarios. CO<sub>2</sub> fluids in downward sloping pipelines with a large drop is more likely to undergo phase transitions due to water hammer effects. Corresponding downstream valve can be closed simultaneously to extend fluid phase transitions in pipelines when a upstream valve in CO<sub>2</sub> pipelines is accidentally shut off.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106837"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145485489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerically stable determination of mixture critical points and loci with PC-SAFT Equation of State 基于PC-SAFT状态方程的混合临界点和位点的数值稳定确定
IF 4.4 3区 工程技术
Journal of Supercritical Fluids Pub Date : 2026-03-01 Epub Date: 2025-10-16 DOI: 10.1016/j.supflu.2025.106817
Mustajab Safarov, Vishnu Jayaprakash, Changxu Wu, Huazhou Li
{"title":"Numerically stable determination of mixture critical points and loci with PC-SAFT Equation of State","authors":"Mustajab Safarov,&nbsp;Vishnu Jayaprakash,&nbsp;Changxu Wu,&nbsp;Huazhou Li","doi":"10.1016/j.supflu.2025.106817","DOIUrl":"10.1016/j.supflu.2025.106817","url":null,"abstract":"<div><div>Compositional simulations are important for understanding, analyzing, and optimizing multiphase flows, especially in the petrochemical industry. These simulations are dependent on an accurate Equation of State (EOS) to model the relationships between phases under changing conditions. While cubic EOS (CEOS) models are widely used in the industry due to their simplicity and efficiency, the Perturbed-Chain Statistical Associating Fluid Theory (PC-SAFT) EOS offers a more physically accurate representation of molecular interactions. Despite the potential of PC-SAFT EOS, the application to predict mixture critical points remains underexplored. These challenges primarily arise from computational complexities and spurious stationary points that have long limited the practical use of PC-SAFT EOS for mixture criticality.</div><div>This study performs a systematic evaluation of two critical point computational methods using PC-SAFT EOS. The critical point calculation methods are applied to compute mixture critical temperatures and pressures, vapor–liquid equilibrium phase envelopes, and to trace full critical loci. Furthermore, the evaluation covers many distinct multicomponent mixtures ranging from two to eleven components. By directly comparing our results against experimental data and the results yielded by CEOS, we provide an evaluation of the performance of PC-SAFT EOS in predicting the critical points of pure compounds and mixtures.</div><div>For pure compounds in the tested mixtures, the results show that Global Optimization (GO) method demonstrates slightly better performance than the Newton–Raphson (NR) method for critical temperature (<span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>) predictions with Average Absolute Relative Deviations (AARD%) of 1.538%, while both show nearly identical performance for critical pressure (<span><math><msub><mrow><mi>P</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>) predictions. For mixtures, PC-SAFT-based NR demonstrates superior performance in predicting critical points with AARD% of 1.687% for <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> predictions and 4.623% for <span><math><msub><mrow><mi>P</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> predictions. In contrast, GO demonstrates higher deviations, particularly for some heavier mixtures. When calculating critical loci of mixtures, both methods produce root mean square error values with typical errors below 10 K for <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> predictions and 0.5 MPa for <span><math><msub><mrow><mi>P</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> predictions.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"229 ","pages":"Article 106817"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145364352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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