Journal of Supercritical Fluids最新文献

Supercritical water co-oxidation of swine manure with methane and lignite in the flow mode

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-03-21 DOI: 10.1016/j.supflu.2025.106602

Oxana N. Fedyaeva , Sergey A. Alekhin , Sergey V. Morozov , Anatoly A. Vostrikov

{"title":"Supercritical water co-oxidation of swine manure with methane and lignite in the flow mode","authors":"Oxana N. Fedyaeva , Sergey A. Alekhin , Sergey V. Morozov , Anatoly A. Vostrikov","doi":"10.1016/j.supflu.2025.106602","DOIUrl":"10.1016/j.supflu.2025.106602","url":null,"abstract":"<div><div>This paper presents the results of a comparative study of supercritical water (SCW) co-oxidation of swine manure (SM) with methane and lignite continuously fed into a flow reactor. The tests were carried out at a temperature gradient along the vertical axis of the reactor (390–600 °C), a pressure of 25 MPa, varying reactant flow rates and oxidation ratio (OR). An analysis of the time dependence of the reactor wall temperature and the power of the resistive heaters was carried out and has shown that, compared to the SCW oxidation of SM, its co-oxidation with methane and lignite led to a 1.5 and 1.8-fold reduction in the power of the heaters, respectively. The gas products were found to be CO<sub>2</sub>, N<sub>2</sub>, and traces of N<sub>2</sub>O. Saturated carboxylic acids C<sub>5</sub>–C<sub>16</sub>, N-bearing aromatics, phenols, chlorophenols, and polycyclic aromatic hydrocarbons (PAHs) were identified in the aqueous effluent by gas chromatography-mass spectrometry. The levels of phenols, chlorophenols, and PAHs in the effluent decreased with increasing OR and with the addition of NaOH. At OR ≥ 1.14, their contents were below the maximum permissible concentrations of these compounds in wastewater. Furthermore, the co-oxidation of SM and lignite increases the content of carboxylic acids, nitrate and sulfate ions in the effluent. The formation of mineral acids during the SCW oxidation of SM intensifies the corrosion of structural materials, resulting in increased contents of chromium, copper, and nickel in the effluent. The paper discusses the transformation mechanisms of organic and mineral components of SM and lignite, as well as ecological aspects of contaminants migration and the efficiency of their removal by SCW oxidation in the SCW/O<sub>2</sub> fluid.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"222 ","pages":"Article 106602"},"PeriodicalIF":3.4,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697279","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 machine learning-based platform for dye solubility in supercritical carbon dioxide: Classification optimization and predictive analysis

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-03-19 DOI: 10.1016/j.supflu.2025.106601

Rongzhen Wang, Tong Feng, Haixin Sun, Lin Li, Kunpeng Yu, Jianzhong Yin

{"title":"A machine learning-based platform for dye solubility in supercritical carbon dioxide: Classification optimization and predictive analysis","authors":"Rongzhen Wang, Tong Feng, Haixin Sun, Lin Li, Kunpeng Yu, Jianzhong Yin","doi":"10.1016/j.supflu.2025.106601","DOIUrl":"10.1016/j.supflu.2025.106601","url":null,"abstract":"<div><div>This study addresses the critical need for the accurate prediction of dye solubility in supercritical carbon dioxide (scCO<sub>2</sub>) to optimize the dyeing process. An open-access dye solubility database was developed that includes 2991 experimental data points for 90 dyes. Machine learning models, namely the multilayer perceptron (MLP), wavelet neural network (WNN), recurrent neural network (RNN), and long short-term memory (LSTM) models, were trained to predict dye solubility. Initial mixed-data training showed limited performance, while classification based on molecular structures by separating anthraquinone dyes, azo dyes and other dyes into distinct datasets, greatly improved the prediction accuracy. For example, WNN achieved an R<sup>2</sup> value of 0.998 for anthraquinone dyes, while MLP and RNN showed better performance for azo and other dye categories. This classification strategy not only improves model performance, but also verifies the critical role of molecular structure in predicting dye solubility, offering a reliable approach for the development of accurate prediction models.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"222 ","pages":"Article 106601"},"PeriodicalIF":3.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698030","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

Hydrothermal corrosion of inconel 625 in high-chlorine, high-alkalinity supercritical water oxidation environments: A new mechanism

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-03-18 DOI: 10.1016/j.supflu.2025.106600

Yanhui Li , Limei Xing , Shaoming Ding , Zhouyang Bai , Wang Zhu , Qibo Wang , Donghai Xu , Kai Wang

{"title":"Hydrothermal corrosion of inconel 625 in high-chlorine, high-alkalinity supercritical water oxidation environments: A new mechanism","authors":"Yanhui Li , Limei Xing , Shaoming Ding , Zhouyang Bai , Wang Zhu , Qibo Wang , Donghai Xu , Kai Wang","doi":"10.1016/j.supflu.2025.106600","DOIUrl":"10.1016/j.supflu.2025.106600","url":null,"abstract":"<div><div>This study investigates the hydrothermal corrosion behavior of Inconel 625 in high-chlorine, high-alkalinity supercritical water oxidation (SCWO) environments. A significant reduction in corrosion rate was observed between 450°C and 500°C due to a transition from electrochemical to chemical corrosion mechanisms. The transition temperature increased from approximately 420°C to 450–500°C at 25 MPa, attributed to molten NaOH stabilizing ion transport. At 600°C, interactions between molten NaOH and oxide films cause melting and sintering, leading to oxide film resolidification but raising concerns about mechanical instability. Under oxygen-rich conditions, chromium from the protective inner oxide layer oxidizes to soluble Cr⁶⁺, depleting the inner layer and accelerating outer layer growth, with a significant increase in the outer-to-inner layer thickness ratio compared to near-pure supercritical water (SCW). The study highlights the synergistic effects of alkalinity, oxygen, and chlorine, provides new insights into corrosion mechanisms, and offers guidance for mitigation strategies in SCWO systems.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"222 ","pages":"Article 106600"},"PeriodicalIF":3.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143677699","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

Integrated process of extraction and reaction of rice bran oil to produce biodiesel

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-03-18 DOI: 10.1016/j.supflu.2025.106598

Suelly R. Hollas , Bárbara Moreira , Milena Garcia , Michel Corrente , Leoni Brondani , Roger Wagner , Flávio D. Mayer , Fernanda de Castilhos , Ederson R. Abaide

引用次数: 0

Comparison of conventional and supercritical isolation methods from bee pollen and their effects on the concentrations of bioactive compounds

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-03-18 DOI: 10.1016/j.supflu.2025.106599

Taja Žitek Makoter , Vesna Postružnik , Anastasia Kyriakoudi , Elli Pantazi , Natasa Kalogiouri , Ioannis Mourtzinos , Željko Knez , Maša Knez Marevci

引用次数: 0

Optimization of quercetin - liposomal dry powders for pulmonary delivery using supercritical CO₂-assisted spray drying

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-03-17 DOI: 10.1016/j.supflu.2025.106591

Clarinda Costa , Liliana Grenho , Teresa Casimiro , Pedro Sousa Gomes , Maria Helena Fernandes , M. Luisa Corvo , Ana Aguiar-Ricardo

{"title":"Optimization of quercetin - liposomal dry powders for pulmonary delivery using supercritical CO₂-assisted spray drying","authors":"Clarinda Costa , Liliana Grenho , Teresa Casimiro , Pedro Sousa Gomes , Maria Helena Fernandes , M. Luisa Corvo , Ana Aguiar-Ricardo","doi":"10.1016/j.supflu.2025.106591","DOIUrl":"10.1016/j.supflu.2025.106591","url":null,"abstract":"<div><div>Quercetin exhibits anti-inflammatory and antioxidant properties. Incorporating quercetin into liposomes can overcome its limited water solubility and poor oral bioavailability, making it a promising candidate for treating inflammatory diseases. For pulmonary administration, supercritical CO<sub>2</sub>-assisted spray drying can be used to convert liposomal suspensions into dry powder formulations suitable for inhalation. However, the extraction power of scCO<sub>2</sub> can pose challenges on retaining the incorporation efficiency (<em>IE</em>) of this flavonoid in the lipid bilayer. This study focuses on optimizing quercetin’s <em>IE</em> after drying using different liposomal lipid compositions with varying surface charges. The <em>IE</em> of quercetin into positively charged liposomes was 57 %. Additionally, the resulting powders had a mass median aerodynamic diameter of 1.7 µm and a fine particle fraction (particle size < 5 µm) of 63 %, indicating their suitability for inhalation. Cytotoxicity assays also revealed that both reconstituted liposomes and dry powder formulations were non-toxic to areolar fibroblast cells.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"222 ","pages":"Article 106591"},"PeriodicalIF":3.4,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Numerical study on flow and heat transfer characteristics of supercritical methane in microchannels with airfoil fins

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-03-17 DOI: 10.1016/j.supflu.2025.106596

Chenchen Zhao , Yue Wang , Liu Yang , Bin Zhao , Qian Li , Weihua Cai

{"title":"Numerical study on flow and heat transfer characteristics of supercritical methane in microchannels with airfoil fins","authors":"Chenchen Zhao , Yue Wang , Liu Yang , Bin Zhao , Qian Li , Weihua Cai","doi":"10.1016/j.supflu.2025.106596","DOIUrl":"10.1016/j.supflu.2025.106596","url":null,"abstract":"<div><div>In order to study the thermal and flow properties of interstage coolers in the liquefaction of methane process, numerical analyses were carried out on methane flow within a printed circuit heat exchanger (PCHE) with airfoil fins. A geometry model was developed in this research to include staggered microchannels with airfoil fins. The SST <em>k-ω</em> turbulence model was utilized in the analysis of how various operating parameters, including inlet flux, outlet pressure and inlet temperature, impact flow and thermal characteristics. It was found that higher inlet temperatures result in improved thermal feature but are also associated with increased resistance. Conversely, higher outlet pressure conditions led to better overall flow and thermal feature. Furthermore, the impact of airfoil fins on flow characteristics was studied, considering factors such as secondary flow intensity and entropy generation. Correlations for Fanning frictional factor and Nusselt number were developed with a margin of error within ± 3.5 %. These research findings are intended to benefit the design and optimization of PCHEs featuring airfoil fins microchannels for applications.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"222 ","pages":"Article 106596"},"PeriodicalIF":3.4,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143677702","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

Techno-economic analysis of amino acids production with subcritical water technology

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-03-15 DOI: 10.1016/j.supflu.2025.106595

William Gustavo Sganzerla , Barbara Pezzini Moreira , Daniel Lachos-Perez , Giovani L. Zabot , Luiz Eduardo Nochi Castro , Tânia Forster-Carneiro , Maurício Ariel Rostagno

{"title":"Techno-economic analysis of amino acids production with subcritical water technology","authors":"William Gustavo Sganzerla , Barbara Pezzini Moreira , Daniel Lachos-Perez , Giovani L. Zabot , Luiz Eduardo Nochi Castro , Tânia Forster-Carneiro , Maurício Ariel Rostagno","doi":"10.1016/j.supflu.2025.106595","DOIUrl":"10.1016/j.supflu.2025.106595","url":null,"abstract":"<div><div>This study conducted a techno-economic assessment of amino acid production from brewers’ spent grains (BSG) using semi-continuous subcritical water hydrolysis. The process was operated at a pressure of 15 MPa, with a water flow rate of 5 mL/min, a solvent-to-feed ratio of 20 g water/g BSG, and at various temperatures (80 °C to 180 °C). The experimental results demonstrated that the amino acid yield of the single subcritical reactor (10.20 mg/g BSG) was higher compared to the two-sequential reactors (4.72 mg/g BSG). The hydrolysate obtained experimentally was composed mainly of tryptophan (215 µg/mL), valine (64 µg/mL), and aspartic acid (123 µg/mL). The economic analysis revealed that the manufacturing cost of amino acids ranged from 33.66 USD/kg to 49.42 USD/kg. The implementation cost of downstream processing represents the most significant fixed capital investment, as complex unit operations are required to isolate and purify amino acids.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"222 ","pages":"Article 106595"},"PeriodicalIF":3.4,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642771","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

Thermal and hydraulic performance of half-cone minichannel design for supercritical CO2 PCHE

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-03-13 DOI: 10.1016/j.supflu.2025.106594

Haisong Zhang , Bo Wang , Xiang Xu , Lin Chen , Tianshu Song , Bingguo Zhu

引用次数: 0

Revealing the catalytic gasification mechanisms of toluene and naphthalene in supercritical water using ReaxFF-MD and DFT methods 利用 ReaxFF-MD 和 DFT 方法揭示超临界水中甲苯和萘的催化气化机理

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-03-12 DOI: 10.1016/j.supflu.2025.106593

Linhu Li , Gaoyun Wang , Xujun Li , Shi Liu , Wen Cao

{"title":"Revealing the catalytic gasification mechanisms of toluene and naphthalene in supercritical water using ReaxFF-MD and DFT methods","authors":"Linhu Li , Gaoyun Wang , Xujun Li , Shi Liu , Wen Cao","doi":"10.1016/j.supflu.2025.106593","DOIUrl":"10.1016/j.supflu.2025.106593","url":null,"abstract":"<div><div>Supercritical water gasification (SCWG) is a promising method for treating hazardous oily sludge waste from petroleum industry. However, achieving complete gasification under mild conditions remains challenging, particularly for persistent intermediates such as toluene and naphthalene. Herein, molecular dynamics simulations are used to explore the impact of Na<sub>2</sub>CO<sub>3</sub> on target product yields from toluene and naphthalene in SCWG. The findings reveal that Na<sub>2</sub>CO<sub>3</sub> considerably enhances radical yields within the reaction system, especially OH radicals, leading to increased gas production (H<sub>2</sub>, CO, and CO<sub>2</sub>). Molecular dynamics and density functional theory calculations reveal that Na<sub>2</sub>CO<sub>3</sub> accelerates the ring-opening process and reduces the energy barrier of toluene and naphthalene to 7.4379 ± 0.0001 kcal/mol and 53.5887 ± 0.0011 kcal/mol, respectively. This study highlights OH radicals as an effective active substance in SCWG aromatic conversion. Further catalyst optimization and system design are essential for a highly efficient and clean oily sludge treatment.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"222 ","pages":"Article 106593"},"PeriodicalIF":3.4,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619214","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