Journal of Supercritical Fluids最新文献_第8页

Supercritical extraction of butter from agroindustrial cocoa residue from the Amazon 从亚马逊地区农业工业可可渣中超临界提取黄油

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-02-13 DOI: 10.1016/j.supflu.2025.106560

Jean Maurício Leão Pinheiro , Ana Paula de Souza e Silva , Kelly Roberta Pinheiro Pantoja , Marcos Antônio Ribeiro Cardoso , Fernando de Freitas Maues de Azevedo , Leonardo Victor Gomes de Melo , Gabriela Izane de Almeida Campos , Rafael Vitti Mota , Rayssa de Sousa Mouzinho , Raul Nunes de Carvalho Junior

引用次数: 0

Observations and analysis of near-critical fuel injection 近临界燃油喷射的观察与分析

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-02-13 DOI: 10.1016/j.supflu.2025.106549

Z. Alexander , T. Krause , N. Ly , U. Hegde , M. Hicks , M. Ihme

{"title":"Observations and analysis of near-critical fuel injection","authors":"Z. Alexander , T. Krause , N. Ly , U. Hegde , M. Hicks , M. Ihme","doi":"10.1016/j.supflu.2025.106549","DOIUrl":"10.1016/j.supflu.2025.106549","url":null,"abstract":"<div><div>Results from a study of n-heptane jets injected into a nitrogen environment under supercritical pressures with respect to n-heptane are presented. The temperature of the injected jet varies from supercritical to subcritical values (with respect to the n-heptane critical temperature) while the ambient environment is maintained at temperatures above the critical temperature of n-heptane. Three types of jets are observed and described: (1) subcritical, where the liquid/gas interface persists until complete evaporation of the liquid phase (2) supercritical, where there is no sharp interface between the injected jet and the ambient gas, and (3) transcritical, where distinct liquid/gas phase interface exists at injection but disappears before complete evaporation of the liquid. The subcritical and transcritical jets exhibit Rayleigh-Plateau instability where the jet breaks up into droplets. For subcritical jets, the droplets maintain their sharp interface whereas for the transcritical case the droplets transition from evaporative mixing to diffusive mixing with the surrounding fluid. The experiments are conducted under microgravity conditions at the Zero-Gravity Facility at NASA Glenn Research Center to minimize effects of buoyancy. To interpret these observations, the evolution of a transitioning droplet is modeled with a Regularized Interface Method that can describe both subcritical and supercritical processes as well as transcritical dynamics. Model predictions of critical transition are compared with experimental results and show good agreement.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"220 ","pages":"Article 106549"},"PeriodicalIF":3.4,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454911","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

Enhanced separation of valuable compounds from Spirulina using supercritical carbon dioxide: Influence of pretreatments and co-solvent addition on composition and bioactivity of extracts 超临界二氧化碳强化螺旋藻中有价化合物的分离：预处理和助溶剂添加对萃取物组成和生物活性的影响

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-02-10 DOI: 10.1016/j.supflu.2025.106545

Stoja Milovanovic , Agnieszka Grzegorczyk , Łukasz Świątek , Katarzyna Tyśkiewicz , Marcin Konkol , Dusica Stojanovic

{"title":"Enhanced separation of valuable compounds from Spirulina using supercritical carbon dioxide: Influence of pretreatments and co-solvent addition on composition and bioactivity of extracts","authors":"Stoja Milovanovic , Agnieszka Grzegorczyk , Łukasz Świątek , Katarzyna Tyśkiewicz , Marcin Konkol , Dusica Stojanovic","doi":"10.1016/j.supflu.2025.106545","DOIUrl":"10.1016/j.supflu.2025.106545","url":null,"abstract":"<div><div>There is a lack of information on pretreatments that improve the separation of biologically valuable extracts from <em>Spirulina</em> using supercritical carbon dioxide (scCO<sub>2</sub>). Therefore, this study was focused on testing microwave irradiation and rapid gas decompression pretreatments for the recovery of <em>Spirulina</em> extracts that express antioxidant, antimicrobial, and cytotoxic activity. Extractions from native and pretreated microalgae were performed using scCO<sub>2</sub> at 40 MPa and 40 °C, without or with ethanol as a co-solvent. Results revealed that the extraction process was positively influenced to some extent by the application of each pretreatment and co-solvent addition. Specifically, extraction yield was improved up to 8.7-fold, separation of γ-linolenic acid increased from 7.3% to 35.6 %, chlorophyll A content increased from 12.1 to 272.1 mg/g extract, and tocopherol amount rose from 1.3 to 24.7 mg α-TE/g dry biomass. On the other hand, separations performed with co-solvent decreased the content of carotenoids from 100.2 to 35.6 mg/g as well as the antioxidant activity of extracts and their cytotoxicity on human hypopharyngeal squamous cell carcinoma. Moreover, the addition of ethanol to scCO<sub>2</sub> had an adverse effect on the flavonoid content (which ranged from 45.8 to 82.4 mg RE/g) and the antimicrobial activity of extracts against 32 microbial strains. This exploratory study provides guidelines for the design, operation, and intensification of an environmentally friendly separation of added-value <em>Spirulina</em> extracts.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"220 ","pages":"Article 106545"},"PeriodicalIF":3.4,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395138","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

Measurement of phase transition, density and viscosity of supercritical carbon dioxide-Fischer-Tropsch wax mixtures 超临界二氧化碳-费托蜡混合物的相变、密度和粘度的测量

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-02-10 DOI: 10.1016/j.supflu.2025.106546

Andri Swanepoel , Philip W. Labuschagne , Cara E. Schwarz

引用次数: 0

Phase equilibrium modeling for CCUS fluids using a modified association equation of state 用一种修正的状态关联方程对CCUS流体进行相平衡建模

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-02-07 DOI: 10.1016/j.supflu.2025.106543

Wei Xiong , Lie-Hui Zhang , Yu-Long Zhao , Shao-Mu Wen , Li-Li Liu , Zheng-Lin Cao , Yong-Chao Wang , Shan-Gui Luo , Xian-Yu Jiang

{"title":"Phase equilibrium modeling for CCUS fluids using a modified association equation of state","authors":"Wei Xiong , Lie-Hui Zhang , Yu-Long Zhao , Shao-Mu Wen , Li-Li Liu , Zheng-Lin Cao , Yong-Chao Wang , Shan-Gui Luo , Xian-Yu Jiang","doi":"10.1016/j.supflu.2025.106543","DOIUrl":"10.1016/j.supflu.2025.106543","url":null,"abstract":"<div><div>Accurate derivatives are required for simulating large-scale carbon dioxide (CO<sub>2</sub>) geological storage using the Cubic-Plus-Association equation of state (CPA EoS). However, due to the mathematical implicitness of cross-association, calculating the correct derivatives of site fractions for cross-association mixtures is extremely difficult and computationally demanding. A general explicit formulation of cross-association for different bonding types is presented. The non-bonded fraction of cross-associating molecules is obtained from the non-bonded fraction of self-associating molecules without cross-association. This approach eliminates the circular iterative process and improves computational efficiency. The overall CPU time decreases by 70 % for flash calculations and compositional simulations. The modeling capability of CPA is extended to H<sub>2</sub>O-CO<sub>2</sub>-H<sub>2</sub>S-N<sub>2</sub>-O<sub>2</sub>-Ar-SO<sub>2</sub>-CH<sub>4</sub>-C<sub>2</sub>H<sub>6</sub>-C<sub>3</sub>H<sub>8</sub> mixtures. Results indicate that CPA can accurately predict the phase behavior of binary CO<sub>2</sub> capture, utilization, and storage (CCUS) mixtures. This study provides a modified CPA EoS, applicable to most of the currently treated CCUS fluids, and discusses its strengths and limitations.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"219 ","pages":"Article 106543"},"PeriodicalIF":3.4,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387623","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

Supercritical extraction of salicin, aspirin precursor, from the willow bark, laboratory optimization via response surface methodology and mathematical modeling 从柳树皮中超临界提取阿司匹林前体水杨苷，通过响应面法和数学建模进行实验室优化

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-02-06 DOI: 10.1016/j.supflu.2025.106540

Mohammad Abohassan , Normurot Fayzullaev , Gaber Edris , Subasini Uthirapathy , Gaurav Sanghvi , Naga Bhushana Rao Vakada , Swati Sharma , Prashant Nakash , Yasser Fakri Mustafa , Maythum Ali Shallan

{"title":"Supercritical extraction of salicin, aspirin precursor, from the willow bark, laboratory optimization via response surface methodology and mathematical modeling","authors":"Mohammad Abohassan , Normurot Fayzullaev , Gaber Edris , Subasini Uthirapathy , Gaurav Sanghvi , Naga Bhushana Rao Vakada , Swati Sharma , Prashant Nakash , Yasser Fakri Mustafa , Maythum Ali Shallan","doi":"10.1016/j.supflu.2025.106540","DOIUrl":"10.1016/j.supflu.2025.106540","url":null,"abstract":"<div><div>In this study, salicin, the key active ingredient in willow bark and a primary source of aspirin, was extracted using supercritical CO₂. Gas chromatography (GC) characterized the extract. Key operating factors, including pressure, temperature, particle size, and extraction time, were varied to optimize extraction yield, employing response surface methodology (RSM) with a central composite design (CCD) method. The maximum yield was 12.371 % (mass of extracted salicin / mass of dry willow bark) with a 56.75 % salicin recovery under the optimal condition, determined as 22 MPa pressure, 40 °C temperature, 0.45 mm particle size, and 100 minutes extraction time. Results showed that higher extraction time and pressure increased yield, while temperature and particle size reduced it. Extraction time had the most significant effect, while temperature was the least impactful. The Sovová and Tan and Liou models were applied, showing close agreement between predicted and experimental extraction curves.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"219 ","pages":"Article 106540"},"PeriodicalIF":3.4,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387624","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

Supercritical CO2 foaming and mechanical properties of thermoplastic polyurethane based on molecular structure 基于分子结构的热塑性聚氨酯超临界CO2发泡及力学性能研究

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-02-06 DOI: 10.1016/j.supflu.2025.106541

Chenyang Niu, Xiulu Gao, Yichong Chen, Weizhen Sun, Ling Zhao, Dongdong Hu

{"title":"Supercritical CO2 foaming and mechanical properties of thermoplastic polyurethane based on molecular structure","authors":"Chenyang Niu, Xiulu Gao, Yichong Chen, Weizhen Sun, Ling Zhao, Dongdong Hu","doi":"10.1016/j.supflu.2025.106541","DOIUrl":"10.1016/j.supflu.2025.106541","url":null,"abstract":"<div><div>The molecular structures of thermoplastic polyurethane (TPU) affect its microphase separation and foaming behavior. Three aliphatic TPUs were studied to investigate the influence of their molecular structures on their crystallization behavior, shear rheological properties, mechanical properties, and foaming behavior. The experimental results indicated that the branched structure and hard segment content affected the crystallization behavior of TPU. Lower crystallinity decreased the foaming initiation temperature, whereas higher crystallinity enhanced the stability of cell structure. The branched structure and hard segment domains functioned as heterogeneous nucleation sites, leading to increased cell density and reduced cell size in microcellular TPU. Microcellular TPU with a high molecular weight and branched structure exhibited superior tensile strength and elongation at break, i.e., the tensile strength and elongation at break of TPU1 with a density of 0.25 g/cm<sup>3</sup> reached 10.82 MPa and 373 %, respectively. This study demonstrated the regulation of microcellular TPU by analyzing its molecular structures.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"219 ","pages":"Article 106541"},"PeriodicalIF":3.4,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143228086","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

Supercritical CO2 assisted extraction, purification and modelling of free fatty acids from the crude mixture – A case study of tallow hydrolysis 超临界CO2辅助萃取，纯化和模拟从粗混合物游离脂肪酸-一个案例研究的油脂水解

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-02-04 DOI: 10.1016/j.supflu.2025.106542

EK Anagha , R. Sariga , K. ShyamSundar , Rames C. Panda , M. Helen Kalavathy , S.N. Naik

{"title":"Supercritical CO2 assisted extraction, purification and modelling of free fatty acids from the crude mixture – A case study of tallow hydrolysis","authors":"EK Anagha , R. Sariga , K. ShyamSundar , Rames C. Panda , M. Helen Kalavathy , S.N. Naik","doi":"10.1016/j.supflu.2025.106542","DOIUrl":"10.1016/j.supflu.2025.106542","url":null,"abstract":"<div><h3>Background</h3><div>Tallow, a by-product of the leather-industry, is widely used in pharmaceuticals and oleochemical applications as a source/precursor of glycerol, obtained by aqueous-hydrolysis under high-pressure-temperature from a hydrolyzing-tower. Though standard procedures of extracting glycerol from the bottom-product are well established, the purification of fatty-acids (FA) from the top crude-mixture needs attention</div></div><div><h3>Method</h3><div>This paper identifies and separates individual fatty-acids from the Twitchell-process using the supercritical-fluid-extraction (SFE). Solubilities (Soave-Redlich-Kwong) and phase-diagrams are obtained using Matlab & Aspen, respectively. The characteristics of the product are analyzed by mass-spectroscopy which reveals that the FA-components present in the crude-mixture in the ratio of 4.3:32.2:43.0:20.4 for C-14, C16, C16 = 2, and C18 components respectively are more efficiently extracted by the solvent of SFE compared to CH<sub>3</sub>OH solvent</div></div><div><h3>Findings</h3><div>It has been found from the analysis and characterization that the rate of extraction is improved by 2–3 times in case of saturated while it’s about 9 times in-case-of unsaturated FA compared to the nominal method of extraction. Addition of ionic-liquid (IL) with SFE-solvent improved the solubility to 92 %. A model is formulated to validate the findings. It is suggested that the pure components extracted by SFE assisted by IL can be used for the preparation of oleochemicals in further downstream-processing.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"219 ","pages":"Article 106542"},"PeriodicalIF":3.4,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349287","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

Effect of pressure and monomer concentration on ring-opening enzymatic polymerization of globalide in pressurized propane 压力和单体浓度对加压丙烷中全酰胺开环酶解聚合的影响

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-02-03 DOI: 10.1016/j.supflu.2024.106508

Maria N.H. Cupaja , Camila Guindani , Frederico W. Tavares , Papa M. Ndiaye

引用次数: 0

Applications of ionic liquids in improving CO2 miscibility in crude oil for enhanced oil recovery and CO2 sequestration applications 离子液体在改善原油中二氧化碳混相中的应用，以提高原油采收率和二氧化碳封存应用

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-02-02 DOI: 10.1016/j.supflu.2025.106539

Mohammed A. Al-Hakami , Ahmed Farid Ibrahim , Khaled Z. Abdelgawad

{"title":"Applications of ionic liquids in improving CO2 miscibility in crude oil for enhanced oil recovery and CO2 sequestration applications","authors":"Mohammed A. Al-Hakami , Ahmed Farid Ibrahim , Khaled Z. Abdelgawad","doi":"10.1016/j.supflu.2025.106539","DOIUrl":"10.1016/j.supflu.2025.106539","url":null,"abstract":"<div><div>Innovation and sustainability are critical for maximizing reserves in the petroleum industry, especially in deep heavy oil reservoirs where traditional thermal EOR techniques often underperform. CO<sub>2</sub>-flooding offers a promising alternative, with its effectiveness dependent on achieving minimum miscibility pressure (MMP). Reducing MMP offers higher recovery factors while avoiding issues due to formation fracturing at high injection pressures. This study evaluates ionic liquids (ILs), 1-methyl-3-octylimidazolium chloride ([MOIM]Cl) and 1-decyl-3-methylimidazolium chloride ([DMIM]Cl), for lowering MMP in CO<sub>2</sub>-crude oil systems. Results showed [MOIM]Cl and [DMIM]Cl reduced MMP by 17 % and 13.5 %, outperforming n-butanol and non-ionic surfactants, which achieved 6 % and 9 % reductions, respectively. For extra heavy oil, [MOIM]Cl reduced MMP by 15.5 %. The ILs also lowered first contact miscibility pressure across crude oils with asphaltene content ranging from 6.4 to 36 wt%. These findings highlight ILs' potential to improve CO<sub>2</sub> miscibility in heavy oil reservoirs, providing a sustainable solution for enhanced oil recovery.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"219 ","pages":"Article 106539"},"PeriodicalIF":3.4,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143168307","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