Journal of Supercritical Fluids最新文献_第4页

Phase equilibria of solution mixture for allyl phenylacetate, amyl phenylacetate and benzyl phenylacetate systems under supercritical CO2 超临界CO2条件下苯乙酸丙烯基、苯乙酸戊基和苯乙酸苄酯体系溶液混合物的相平衡

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2026-06-01 Epub Date: 2026-02-04 DOI: 10.1016/j.supflu.2026.106924

Uma Sankar Behera , Hakyeong Kim , Hun-Soo Byun

The growing industrial relevance of phenylacetate derivatives, driven by their unique properties and wide-ranging applications, underscores the importance of accurate vapor–liquid equilibrium (VLE) data, particularly for separation processes using supercritical CO₂ as a sustainable solvent. This study investigates the phase behavior of binary systems composed of CO₂ with allyl, amyl, and benzyl phenylacetates over a temperature range of 313.2–393.2 K and pressures up to 24.97 MPa. Literature studies and thermodynamic databases such as DETHERM and DECHEMA indicate that phase equilibrium data for these systems under supercritical conditions have not been reported previously. The pressure–temperature profiles revealed that the critical mixture curves connect the critical points of the pure components, exhibiting Type-I behavior as described by van Konynenburg and Scott. In all three systems, increasing the phenylacetate concentration enhanced solubility and reduced system pressure at constant temperature. The experimental bubble point data were fitted using the Peng–Robinson equation of state (PR EoS) combined with the van der Waals one-fluid mixing rule. The binary interaction parameters were optimized for each system: allyl phenylacetate (k_ij = 0.040, η_ij = –0.040), amyl phenylacetate (k_ij = 0.055, η_ij = –0.045), and benzyl phenylacetate (k_ij = 0.040, η_ij = –0.050). The model demonstrated good agreement with the experimental measurements, yielding root mean square deviation (RMSD) values between 5.64 % and 8.86 % across all investigated systems and operating conditions.

由于其独特的性能和广泛的应用，苯乙酸酯衍生物的工业相关性日益增强，强调了准确的汽液平衡（VLE）数据的重要性，特别是对于使用超临界二氧化碳作为可持续溶剂的分离过程。在313.2-393.2 K的温度范围和24.97 MPa的压力范围内，研究了由CO2与苯乙酸烯丙基、戊基和苯乙酯组成的二元体系的相行为。文献研究和热力学数据库（如DETHERM和DECHEMA）表明，这些系统在超临界条件下的相平衡数据以前没有报道过。压力-温度曲线显示临界混合曲线连接纯组分的临界点，表现出van Konynenburg和Scott所描述的i型行为。在这三种体系中，恒定温度下，增加苯乙酸酯浓度可提高溶解度并降低体系压力。实验气泡点数据采用Peng-Robinson状态方程（PR EoS）结合范德华单流体混合规则进行拟合。优化了各体系的二元相互作用参数：苯乙酸烯丙基（kij = 0.040, ηij = -0.040）、苯乙酸戊基（kij = 0.055, ηij = -0.045）和苯乙酸苄基（kij = 0.040, ηij = -0.050）。该模型与实验测量结果吻合良好，在所有研究系统和操作条件下，均方根偏差（RMSD）值在5.64 %和8.86 %之间。

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引用次数: 0

Valorization of Eucalyptus grandis × Eucalyptus urophylla leaves using supercritical fluid extraction: Yield optimization, chemical composition, and bioactivities 超临界流体萃取大桉×尾叶桉叶片的产率优化、化学成分和生物活性研究

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2026-05-01 Epub Date: 2026-01-12 DOI: 10.1016/j.supflu.2026.106892

See Cheng Yip , Lai Yee Ho , Yee Ho Chai , Nam Weng Sit

Eucalyptus grandis × Eucalyptus urophylla has been cultivated on a large scale in Malaysia for its timber values. Its leftover leaves are considered agricultural waste. This study aimed to optimize extraction yields and evaluate the chemical composition and bioactivities of leaf extracts from Eucalyptus hybrid produced using supercritical fluid extraction (SFE) with carbon dioxide. Leaves were collected from Eucalyptus hybrid trees aged 17 months to 31 months (group A) and 40 months to 50 months (group B). Optimization using response surface methodology (RSM) identified optimal extraction conditions (pressure, temperature, and time) as 29.7 MPa, 79.8 °C, and 116.2 min for A, and 30.0 MPa, 79.6 °C, and 108.6 min for B. Gas chromatography-mass spectrometry (GC-MS) showed that eucalyptol (18.82 %) and eucalyptin (16.46 %) were the dominant compounds in A and B, respectively. Incorporation of 10 % ethanol as co-solvent increased the SFE yield by approximately 10-fold from 0.475 % (w/w) (A) to 4.650 % (w/w) (A10) and 0.255 % (w/w) (B) to 2.640 % (w/w) (B10). All extracts demonstrated antimicrobial activity, with minimum inhibitory concentrations ranging from 0.02 mg/mL to 2.50 mg/mL against 10 bacterial strains, and 0.02 mg/mL to 1.25 mg/mL against seven fungal strains. The extracts were generally more effective against Gram-positive bacteria and exhibited variable antifungal activity depending on the fungal species. Notably, the ethanol-assisted SFE extract from B showed the strongest larvicidal activity against Aedes aegypti (LC₅₀: 187.02 µg/mL) and Aedes albopictus (LC₅₀: 294.48 µg/mL) after 48-hour exposure. These findings suggest that Eucalyptus hybrid leaves are a promising source of bioactive compounds with potential applications as disinfectants and mosquito larvicides.

巨桉×尾叶桉因其木材价值在马来西亚已被大规模种植。它的残叶被认为是农业废弃物。本研究旨在优化二氧化碳超临界流体萃取桉叶提取物的提取率，并对其化学成分和生物活性进行评价。选取17 ~ 31月龄桉树（A组）和40 ~ 50月龄桉树（B组）的叶片。通过响应面法（RSM）优化，确定了A和B的最佳提取条件（压力、温度和时间）分别为29.7MPa、79.8°C和116.2min； B的最佳提取条件为30.0MPa、79.6°C和108.6min。加入10%乙醇作为助溶剂，SFE产率从0.475% (w/w) (A)提高到4.650% (w/w) (A10)，从0.255% (w/w) (B)提高到2.640% (w/w) (B10)，提高了约10倍。所有提取物均表现出抗菌活性，对10株细菌的最低抑菌浓度在0.02mg/mL ~ 2.50mg/mL之间，对7株真菌的最低抑菌浓度在0.02mg/mL ~ 1.25mg/mL之间。提取物一般对革兰氏阳性菌更有效，并且根据真菌种类表现出不同的抗真菌活性。结果表明，乙醇辅助SFE提取物对埃及伊蚊（LC50: 187.02µg/mL）和白纹伊蚊（LC50: 294.48µg/mL）的杀幼虫活性最强。这些发现表明，桉树杂交种叶是一种很有前景的生物活性化合物来源，具有作为消毒剂和杀蚊幼虫剂的潜在应用价值。

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引用次数: 0

Experimental study on supercritical CO₂ flow and heat transfer in rectangular microchannel PCHE under recompression cycle conditions 矩形微通道PCHE在再压缩循环条件下的超临界co2流动与传热实验研究

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2026-05-01 Epub Date: 2025-12-30 DOI: 10.1016/j.supflu.2025.106873

Shishen Cheng , Yan Ren , Ruowen Jiang , Mengjie Song , Weidong Wu , Yingying Yang , Qiguo Yang

Rectangular microchannel printed circuit heat exchangers (RM-PCHEs) exhibit excellent flow and heat transfer characteristics. However, within the operating range of low-temperature recuperator for the supercritical carbon dioxide (SCO₂) Brayton recompression cycle, their performance data remain scant for hot-side inlet temperatures ranging from 373.8 K to 423.4 K. To address this gap, this study conducted experimental research on the flow and heat transfer characteristics of an RM-PCHE using SCO₂ as the working fluid, based on a comprehensive performance test system for heat exchangers. The results showed that the heat transfer performance of test sample was most significantly inﬂuenced by SCO₂ inlet temperature, with a 4.3 % increase in Q_ave and a 1.3 % decrease in UA for every 1 % increase in T_hot,i, and a 3.6 % increase in ε for every 1 % increase in T_cold,i. Besides, the test sample was most greatly inﬂuenced by mass flow rate, with a 1.5 % decrease in ΔP_hot for every 1 % decrease in m_hot, and a 1.7 % in ΔP_cold for every 1 % decrease in m_cold. Finally, test sample demonstrated enhanced thermal hydraulic performance, achieving maximum UA and ε values of 414.8 W·K⁻¹ and 0.92, respectively, while the maximum pressure drops on hot- and cold-side were 42.0 kPa and 13.9 kPa, respectively.

矩形微通道印刷电路热交换器（RM-PCHEs）具有优异的流动和传热特性。然而，在超临界二氧化碳（SCO 2） Brayton再压缩循环的低温回热器工作范围内，它们的性能数据在热侧进口温度为373.8K至423.4K范围内仍然缺乏。为了解决这一问题，本研究基于换热器综合性能测试系统，对以SCO 2为工质的RM-PCHE的流动和换热特性进行了实验研究。结果表明，SCO2进口温度对样品换热性能的影响最为显著，每增加1%的Thot，i， Qave增加4.3%，UA降低1.3%；每增加1%的Tcold，i， ε增加3.6%。此外，试样受质量流量的影响最大，mhot每降低1%，ΔPhot降低1.5%；mcold每降低1%，ΔPcold降低1.7%。最后，试样的热工水力性能得到增强，最大UA和ε值分别为414.8W·K⁻¹和0.92，热侧和冷侧最大压降分别为42.0 kPa和13.9 kPa。

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引用次数: 0

Semi-continuous subcritical hydrothermal conversion of lignin-rich defatted olive pomace 半连续亚临界水热转化富木质素脱脂橄榄渣

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2026-05-01 Epub Date: 2025-12-29 DOI: 10.1016/j.supflu.2025.106874

Alex Schulz , William Santos Fagundes , Leonardo Ramos Ten Caten , Francisco Dalcin Vezaro , Crisleine Perinazzo Draszewski , Leoni Nogueira Brondani , Michel Brondani , João Henrique Cabral Wancura , Flávio Dias Mayer , Ederson Rossi Abaide

Defatted olive pomace (DOP) is an abundant and low-cost agro-industrial residue that can be repurposed as an alternative to conventional uses such as direct combustion, animal feed, and land disposal. DOP has potential for the production of value-added products including biocrude (BC), hydrochar (HC), fermentable sugars (FS), and platform chemicals (PC) through the depolymerization of holocellulose and lignin present in its composition. The objective of this study was to evaluate the influence of temperature (250 and 300 ºC) and water-to-biomass ratio (15, 20, and 25) on the yields of BC, HC, FS, and PC through semi-continuous subcritical hydrothermal liquefaction of DOP. The highest yields were achieved at 300 °C with a water-to-DOP ratio of 25, resulting in values of 38.50 ± 3.13, 5.78 ± 1.07, 6.74 ± 1.67, and 2.84 ± 0.13 g/100 g for BC, HC, FS, and PC, respectively. The higher heating values (HHV) of BC and HC were 29.11 ± 0.05 and 26.01 ± 1.18 MJ/kg, respectively—comparable to values reported in other studies with both similar and different residues.

脱脂橄榄渣（DOP）是一种储量丰富且成本低廉的农业工业废渣，可作为直接燃烧、动物饲料和土地处置等传统用途的替代品。DOP具有生产增值产品的潜力，包括生物原油（BC）、碳氢化合物（HC）、可发酵糖（FS）和平台化学品（PC），通过其组成物中全麦纤维素和木质素的解聚。本研究的目的是评估温度（250和300ºC）和水生物质比（15、20和25）对半连续亚临界水热液化DOP的BC、HC、FS和PC产率的影响。收益率最高达到300°C water-to-DOP 25的比例,导致值38.50 ± 3.13,5.78 ± 1.07,6.74 ± 1.67,和2.84 ±0.13  g / 100 g BC, HC, FS,分别和PC。BC和HC的较高热值（HHV）分别为29.11 ± 0.05和26.01 ± 1.18 MJ/kg，与其他相似和不同残留的研究报告的值相当。

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引用次数: 0

Investigating thermodynamic and kinetic behaviors of industrial contaminated lean monoethylene glycol in methane gas hydrate inhibition 工业污染贫乙二醇在甲烷水合物抑制中的热力学和动力学行为研究

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2026-05-01 Epub Date: 2026-01-12 DOI: 10.1016/j.supflu.2026.106891

Mahmood Riyadh Atta , Bhajan Lal , Khor Siak Foo

Regenerated lean monoethylene glycol (LMEG) is widely reused as a thermodynamic hydrate inhibitor in offshore gas production; however, contaminant accumulation during regeneration cycles alters its inhibition performance. This study presents a combined thermodynamic and kinetic evaluation of industrially regenerated LMEG in a methane hydrate system. Hydrate–liquid–vapor equilibrium (HLVE), suppression temperature, induction time, gas uptake, and hydrate conversion were experimentally quantified using a high-pressure sapphire cell for (5−15) wt% LMEG solutions. Thermodynamic measurements show that regenerated LMEG produces average suppression temperatures of approximately (1.4, 2.6, and 4.2) °C for (5, 10, and 15) wt%, respectively, accompanied by a systematic rightward shift of HLVE curves relative to fresh MEG models. Kinetic analysis reveals that induction time increases from 33.8 min (5 wt%) to 58.0 min (15 wt%) at 80 bar, indicating a concentration-dependent delay in hydrate nucleation. Despite delayed nucleation, higher LMEG concentrations sustain elevated post-induction gas uptake, with methane gas-to-hydrate conversion exceeding 95 % at 15 wt% after 300 min. These results demonstrate a contamination-driven dual inhibition behavior in which reduced thermodynamic efficiency is partially offset by enhanced kinetic retardation. The findings highlight the need for combined thermodynamic–kinetic performance metrics when assessing regenerated MEG for industrial hydrate management.

再生瘦单乙二醇（LMEG）作为一种热力学水合物抑制剂在海上天然气生产中被广泛使用；然而，再生过程中污染物的积累改变了其抑制性能。本研究对工业再生LMEG在甲烷水合物体系中的热力学和动力学进行了综合评价。采用高压蓝宝石电池对（5 ~ 15）wt% LMEG溶液进行了水合液气平衡（HLVE）、抑制温度、诱导时间、气体吸收率和水合物转化实验量化。热力学测量表明，再生的LMEG产生的平均抑制温度分别为（5、10和15）wt%，约为（1.4、2.6和4.2）°C，伴随着HLVE曲线相对于新MEG模型的系统右移。动力学分析表明，在80bar下，诱导时间从33.8min （5wt%）增加到58.0min (15wt%)，表明水合物成核的延迟与浓度有关。尽管成核延迟，但较高的LMEG浓度维持了诱导后气体吸收率的提高，在15wt%的条件下，300min后甲烷气到水合物的转化率超过95%。这些结果证明了污染驱动的双重抑制行为，其中减少的热力学效率部分抵消了增强的动力学延迟。研究结果强调了在评估工业水合物管理中再生MEG时需要结合热力学-动力学性能指标。

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引用次数: 0

Green extraction of β-carotene-rich oil from tucumã (Astrocaryum vulgare Mart.) pulp using compressed propane 利用压缩丙烷从tucumã （Astrocaryum vulgare Mart.）纸浆中绿色提取富含β-胡萝卜素的油

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2026-05-01 Epub Date: 2026-01-09 DOI: 10.1016/j.supflu.2026.106889

Lucas Cantão Freitas , Vanessa Souza Carvalho , Rogério Willian Silva dos Santos , Manoel Benedito Sousa Cantão , Eduardo Gama Ortiz Menezes , Marcos Lúcio Corazza , Maria Lucia Masson

Tucumã pulp oil was obtained for the first time using compressed propane extraction (CPE) and compared with the conventional Soxhlet method. The overall extraction yield was determined, and the Spline model was employed to fit the kinetic parameters, including temperature and solvent flow rate. The oils were characterized by their fatty acid composition, β-carotene content, antioxidant capacity, total phenolics content (TPC), total flavonoids (TF), and thermal behavior. CPE extraction provided the highest extraction yield (33.9 wt%) with an efficiency of up to 91.4 %. The extraction condition that resulted in the highest yield was 80 °C and 3 mL/min, with solvent flow rate showing a significant effect (p < 0.05) on the oil extraction yield. The Spline model provided a suitable fit, with a correlation coefficient of R² = 0.99. Tucumã pulp oil obtained via CPE proved to be an excellent source of β-carotene (21 times more than oils obtained by Soxhlet) and oleic acid, both of which are bioactive compounds of great interest in various industrial sectors, with potential applications in cosmetics, foods, and pharmaceuticals. Such applications enhance the production chain of this species, contributing to the Amazonian bioeconomy development.

首次采用压缩丙烷萃取法（CPE）获得了Tucumã纸浆油，并与传统的索氏法进行了比较。确定了总提取率，并采用样条模型拟合温度和溶剂流速等动力学参数。通过脂肪酸组成、β-胡萝卜素含量、抗氧化能力、总酚类物质含量（TPC）、总黄酮含量（TF）和热行为对其进行表征。CPE法提取率最高（33.9wt%），提取率达91.4%。提取率最高的提取条件为80℃、3mL/min，溶剂流速对提取率有显著影响（p < 0.05）。样条模型拟合较好，相关系数R²= 0.99。Tucumã通过CPE获得的纸浆油被证明是β-胡萝卜素（比索氏获得的油多21倍）和油酸的极好来源，这两种都是生物活性化合物，在各个工业部门都有很大的兴趣，在化妆品、食品和药品方面有潜在的应用。这些应用增强了该物种的生产链，促进了亚马逊生物经济的发展。

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引用次数: 0

Modeling supercritical water gasification of municipal waste: Machine learning and data augmentation approaches 城市垃圾超临界水气化建模：机器学习和数据增强方法

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2026-05-01 Epub Date: 2025-12-21 DOI: 10.1016/j.supflu.2025.106872

A. Cosenza , B. Cosenza , S. Lima , F. Scargiali , G. Caputo

This study presents a comprehensive machine learning framework for modeling supercritical water gasification (SCWG) of organic fraction of municipal solid waste (OFMSW) to optimize syngas production. A systematic experimental campaign investigated 16 conditions across 400–450 °C, 10–60 min reaction times, and OFMSW/H₂O ratios of 0.050–0.085, yielding gas compositions with H₂ concentrations of 12–44 %, CO₂ of 24–79 %, CO of 2.8–15.7 %, and CH₄ of 0–22 %. To address limited experimental data challenges, a SCWG-tailored Monte Carlo augmentation with compositional closure, measurement-uncertainty modeling, and leakage-free cross-validation was implemented to address tiny-n multi-output composition prediction, incorporating experimentally characterized uncertainties and generating augmented datasets of 10 × and 100 × the original size while enforcing physical feasibility (non-negativity, unit-sum, and range bounds). Random Forest (RF) and Gradient Boosting (GB) algorithms were employed for multi-output modeling of gas yield and composition. Under physically constrained augmentation and cross-validation, high in-domain accuracy is achieved across the explored operating window with R² values increasing from 0.445 ± 0.327 (RF) and 0.549 ± 0.324 (GB) on original data to > 0.96 for major components on 100 × augmented datasets. Process optimization identified distinct optimal conditions: hydrogen fuel production (450 °C, 16 min, yielding 39.4 % H₂ with 77.6 % gas yield) and Fischer-Tropsch synthesis (450 °C, 10 min, achieving H₂/CO ratio of 2.13 with 63.6 % gas yield). The framework successfully bridges limited experimental data and reliable process optimization, providing validated methodology for advancing SCWG technology toward industrial implementation. Independent validation on new waste batches and configurations will be required to establish broader generalization.

本研究提出了一个全面的机器学习框架，用于模拟城市固体废物（OFMSW）有机部分的超临界水气化（SCWG），以优化合成气生产。在400-450°C、10-60 min反应时间、OFMSW/H₂O比为0.050-0.085的16种条件下进行了系统的实验，得到了H₂浓度为12-44 %、CO₂浓度为24-79 %、CO浓度为2.8-15.7 %、CH _4浓度为0-22 %的气体组成。为了解决有限的实验数据挑战，采用scwg定制的蒙特卡罗增强方法，包括成分闭合、测量不确定性建模和无泄漏交叉验证，以解决微小n多输出成分预测问题，结合实验表征的不确定性，生成原始尺寸为10 × 和100 × 的增强数据集，同时加强物理可行性（非负性、单位和范围边界）。采用随机森林（Random Forest， RF）和梯度增强（Gradient Boosting， GB）算法对天然气产量和成分进行多输出建模。在物理约束增强和交叉验证下，整个探索的操作窗口获得了较高的域内精度，R²值从原始数据的0.445 ± 0.327 （RF）和0.549 ± 0.324 （GB）增加到100个 × 增强数据集上主要成分的>； 0.96。工艺优化确定了不同的最佳条件：氢燃料生产（450°C, 16 min，产氢39.4 %，产氢率77.6% %）和费托合成（450°C, 10 min，产氢率为2.13，产氢率为63.6 %）。该框架成功地连接了有限的实验数据和可靠的流程优化，为推进SCWG技术走向工业实施提供了有效的方法。需要对新的废物批次和配置进行独立验证，以建立更广泛的推广。

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引用次数: 0

Continuous drying of alginate aerogel particles: Residence time measurement and process optimization under high pressure conditions 海藻酸盐气凝胶颗粒的连续干燥：高压条件下停留时间的测量和工艺优化

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2026-05-01 Epub Date: 2026-01-07 DOI: 10.1016/j.supflu.2026.106888

Erik Manke , Bennet Rastar , Alberto Bueno , Baldur Schroeter , Irina Smirnova

This study advances continuous supercritical carbon dioxide (scCO₂) drying of aerogel particles by introducing a non-invasive optical method to determine particle residence time in a countercurrent extraction column. In countercurrent operation, scCO₂ flows upward while the particle suspension in ethanol enters from the top. The method enables precise, real-time residence time measurement under high pressure conditions without disturbing the process. The effects of pressure (100–150 bar), temperature (40–80 °C), CO₂ flow rate (30–80 g/min), and suspension flow rate (10–45 g/min) on residence time and drying efficiency were accordingly analyzed. Experiments were performed in a 1.25 m high extraction column, with an internal diameter of 20.5 mm, using highly spherical alginate beads with a diameter of ∼ 400 µm as a model system. Evidence of effective solvent removal throughout the whole operation range was provided by determination of the residual ethanol content in the intact aerogel beads after the drying process (0.0053–0.0341 g_ethanol/g_aerogel). The dried products featured a specific surface area of 363 ± 27 m²/g, a mesopore volume of 3.2 ± 0.7 cm³ /g, consistent with the typical range of alginate aerogels. The combined insights provide a comprehensive picture of the countercurrent column’s operational response and allow the definition of practical operating windows. Elevated temperature and high pressure provide the most favorable trade-off between short residence time and minimized residual ethanol, maximizing the time-specific yield. Overall, the approach establishes a robust, transferable framework for optimizing continuous scCO₂ drying of aerogel particles and supports extension to other particle sizes and formulations.

本研究通过引入一种非侵入式光学方法来测定颗粒在逆流萃取柱中的停留时间，从而推进气凝胶颗粒的连续超临界二氧化碳（scCO₂）干燥。在逆流操作中，scCO₂向上流动，而乙醇中的悬浮颗粒从顶部进入。该方法能够在高压条件下精确、实时地测量停留时间，而不会干扰过程。分析了压力（100-150 bar）、温度（40-80℃）、CO₂流速（30-80 g/min）和悬浮流速（10-45 g/min）对停留时间和干燥效率的影响。实验在1.25 m高、内径20.5 mm的萃取柱中进行，采用直径为~ 400 µm的高球形海藻酸珠作为模型体系。通过测定干燥过程后完整气凝胶珠中的残留乙醇含量（0.0053-0.0341 乙醇/气凝胶），可以证明在整个操作范围内有效地去除溶剂。干燥产物的比表面积为363 ± 27 m²/g，中孔体积为3.2 ± 0.7 cm³ /g，符合海藻酸盐气凝胶的典型范围。综合的见解提供了逆流柱的操作响应的全面图片，并允许定义实际的操作窗口。高温和高压在较短的停留时间和最小化残留乙醇之间提供了最有利的权衡，最大限度地提高了时间比产率。总的来说，该方法建立了一个强大的、可转移的框架，用于优化气凝胶颗粒的连续scCO 2干燥，并支持扩展到其他粒径和配方。

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引用次数: 0

High-rate anti-shrinkage poly (butylene adipate-co-terephthalate) / poly(butylene succinate) foams with varying PMMA-GMA content 具有不同PMMA-GMA含量的高速率抗收缩聚己二酸丁二酯/聚丁二酸丁二酯泡沫

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2026-04-01 Epub Date: 2025-11-03 DOI: 10.1016/j.supflu.2025.106831

Hanlin Tian , Zepeng Wang , Jinshuo Yu , Yan Zhao , Hongwei Pan , Junjia Bian , Zhibing Wang , Huiliang Zhang

The supercritical CO₂ (sc-CO₂) foaming method is a green and highly efficient foaming technique. ts integration with biodegradable (butylene adipate-co-terephthalate) (PBAT) for foam preparation has increasingly become a research hotspot. However, insufficient foaming and shrinkage remain the primary challenges limiting the application of PBAT foam. To address these issues, foam materials were prepared by incorporating PMMA-GMA into PBAT and PBS, and the effect of PMMA-GMA content on the foaming behavior was investigated. This addition improves the expansion ratio and PBAT foam stability. PMMA-GMA enhanced the storage modulus and complex viscosity in rheological properties, which supports improved polymer foaming. The introduction of carbonyl groups on PMMA and the reduction in phase domain size facilitate CO₂ absorption, thereby increasing the expansion ratio. The high rigidity of PMMA significantly improves the compressive strength of the foam. At 20 % PMMA-GMA content, the foam maintains an expansion ratio of 18.3, with shrinkage reduced to 13 %, and achieves a normalized compression modulus of 2.88 MPa.

超临界co2 （sc-CO2）发泡法是一种绿色高效的发泡技术。其与可生物降解的（己二酸丁二酯-对苯二甲酸酯）（PBAT）相结合制备泡沫已日益成为研究热点。然而，泡沫和收缩不足仍然是限制PBAT泡沫应用的主要挑战。为了解决这些问题，将PMMA-GMA掺入PBAT和PBS中制备泡沫材料，并研究了PMMA-GMA含量对发泡性能的影响。该添加剂提高了PBAT的膨胀率和泡沫稳定性。PMMA-GMA提高了聚合物的存储模量和复合粘度，从而改善了聚合物的流变性能。PMMA上羰基的引入和相畴尺寸的减小有利于CO2的吸收，从而提高了膨胀比。PMMA的高刚性显著提高了泡沫的抗压强度。当PMMA-GMA含量为20 %时，泡沫的膨胀率为18.3，收缩率为13 %，归一化压缩模量为2.88 MPa。

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引用次数: 0

Selective extraction and structural conversion of nutmeg-derived aromatics via subcritical water extraction technique 亚临界水萃取技术对肉豆蔻衍生芳烃的选择性萃取及结构转化

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids

Pub Date : 2026-04-01 Epub Date: 2025-12-04 DOI: 10.1016/j.supflu.2025.106868

Jin-Mi Park, Min-Jung Ko

The extraction characteristics of six aromatic compounds present in nutmeg were investigated using subcritical water extraction (SWE), at 110–200 ℃ for 5–20 min. All aromatic compounds exhibited higher yields at elevated temperatures because of increased solubility resulting from the decreased dielectric constant of subcritical water. The possibility of structural conversion due to hydrothermal decomposition and isomerization at approximately 190–200 ℃ was confirmed. Eugenol, trans-isoeugenol, cis-isoeugenol, and methoxyeugenol yields under the optimal SWE conditions exceeded those obtained using conventional extraction methods at relatively lower temperatures. In contrast, methyleugenol and myristicin yields were higher for solvent extraction (acetone, ethanol, and methanol) and supercritical fluid extraction. These results are based on the differences in the polarity and thermal stability of the compounds. Therefore, SWE effectively extracts thermally stable components from nutmeg while limiting the extraction of methyleugenol and myristicin. This highlights that SWE is efficient for selectively extracting thermally stable compounds.

采用亚临界水萃取法（SWE），在110 ~ 200℃、5 ~ 20 min条件下，研究了肉豆蔻中6种芳香族化合物的提取特性。所有芳香族化合物在高温下都表现出更高的产率，因为亚临界水的介电常数降低导致溶解度增加。在约190 ~ 200℃的温度下，证实了水热分解和异构化导致结构转化的可能性。在最佳SWE条件下，丁香酚、反式异丁香酚、顺式异丁香酚和甲氧基丁香酚的提取率均高于常规提取方法。相比之下，溶剂萃取（丙酮、乙醇和甲醇）和超临界流体萃取的甲基丁香酚和肉豆蔻素得率更高。这些结果是基于化合物的极性和热稳定性的差异。因此，SWE有效地提取了肉豆蔻中的热稳定成分，同时限制了甲基丁香酚和肉豆蔻素的提取。这表明SWE可以有效地选择性地提取热稳定化合物。

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引用次数: 0