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Green preparation of biodegradable poly (butylene adipate-co-terephthalate) foam modified with bio-based epoxidized cardanol using supercritical fluid foaming 利用超临界流体发泡技术绿色制备生物基环氧硬脂醇改性的可生物降解聚(己二酸丁二醇酯-对苯二甲酸丁二醇酯)泡沫塑料
IF 3.4 3区 工程技术 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-08-23 DOI: 10.1016/j.supflu.2024.106391
Jie Yuan, Kun Xue, Xiulu Gao, Yichong Chen, Ling Zhao, Dongdong Hu

Poly (butylene adipate-co-terephthalate) (PBAT) foam is a potential alternative to conventional packaging materials. However, its wide adoption is hindered by issues such as low foaming–expansion ratios and shrinkage. A series of biodegradable epoxidized cardanol (EC)-modified PBAT foams were prepared using supercritical carbon dioxide (CO2) foaming. The addition of EC enhanced the crystallisation temperature and stiffness, and improved the rheological properties, thereby promoting polymer foamability. When the EC content reached 0.6 wt%, lightweight foams with the highest initial expansion ratio (Rv) of 48.4 were produced before shrinkage. N2 was introduced as a co-blowing agent to reduce shrinkage of the PBAT foams, resulting in the production of a microcellular foam with a stable Rv of 12.9. EC improved the foamability of PBAT while also introducing the co-blowing agent N2 to resist shrinkage. These findings can serve as valuable insights for the large-scale production of lightweight biodegradable foams.

聚(己二酸丁二醇酯-共对苯二甲酸酯)(PBAT)泡沫是传统包装材料的潜在替代品。然而,发泡膨胀率低和收缩等问题阻碍了它的广泛应用。本研究利用超临界二氧化碳(CO2)发泡技术制备了一系列可生物降解的环氧化贲醇(EC)改性 PBAT 泡沫。EC 的添加提高了结晶温度和硬度,改善了流变特性,从而提高了聚合物的发泡性。当氨基甲酸乙酯含量达到 0.6 wt%时,可生产出收缩前初始膨胀率(Rv)最高的 48.4 轻质泡沫。引入 N2 作为共发泡剂可减少 PBAT 泡沫的收缩,从而生产出 Rv 值稳定在 12.9 的微孔泡沫。EC 改善了 PBAT 的可发泡性,同时还引入了助发泡剂 N2 来防止收缩。这些发现可为大规模生产轻质生物可降解泡沫提供宝贵的启示。
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引用次数: 0
Advancements in conventional and supercritical CO2 extraction of Moringa oleifera bioactives for cosmetic applications: A review 传统和超临界二氧化碳萃取美容用辣木籽生物活性成分的进展:综述
IF 3.4 3区 工程技术 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-08-22 DOI: 10.1016/j.supflu.2024.106388
Júlia C. Kessler - , Isabel M. Martins , Yaidelin A. Manrique , Alírio E. Rodrigues , Maria Filomena Barreiro , Madalena M. Dias

Moringa oleifera L. extracts (Mo) have attracted attention as a sustainable and effective alternative to synthetic ingredients for cosmetic formulations. The unique and diverse phytochemical profile of the Mo tree enhances the quality and appeal of commercial products, as evidenced by numerous studies and patents. Supercritical carbon dioxide extraction (SFE-CO2) is particularly advantageous for this purpose, offering enhanced thermostability and selectivity of extracted compounds compared to conventional methods. This review examines the safety and efficacy of Mo seed, leaf, and root extracts as cosmetic ingredients, focusing on their bioavailability and performance by considering the thermodynamics and operational benefits of SFE-CO2. The collected data highlights the method’s efficiency in terms of the total extraction yield and the recovery of target compounds from Mo, providing insights from optimisation studies and linking the solvation power of supercritical CO2 with the significant non-polar and low-polar compounds present in Mo extracts.

辣木(Moringa oleifera L.)提取物作为化妆品配方中合成成分的一种可持续且有效的替代品,已经引起了人们的关注。辣木独特而多样的植物化学成分提高了商业产品的质量和吸引力,这一点已被大量研究和专利所证实。与传统方法相比,超临界二氧化碳萃取(SFE-CO2)具有更高的热稳定性和对萃取化合物的选择性,在这方面尤其具有优势。本综述通过考虑 SFE-CO2 的热力学和操作优势,研究了作为化妆品成分的茉莉种子、叶片和根提取物的安全性和功效,重点关注其生物利用率和性能。所收集的数据强调了该方法在总萃取率和钼目标化合物回收率方面的效率,提供了优化研究的见解,并将超临界二氧化碳的溶解能力与钼萃取物中存在的大量非极性和低极性化合物联系起来。
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引用次数: 0
Experimental and numerical study on the heat transfer deterioration of supercritical nitrogen in a vertical tube 垂直管中超临界氮气传热恶化的实验和数值研究
IF 3.4 3区 工程技术 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-08-17 DOI: 10.1016/j.supflu.2024.106376
Runfeng Xiao , Jing Cao , Liang Chen , Zixin Zhang , Bin Ye , Yijie Cai , Yu Hou

Supercritical cryogenic fluids exhibit significant potential for diverse applications across various industries, including liquid air energy storage, high-temperature superconducting cables, and hypersonic vehicle engine cooling. Heat transfer deterioration (HTD) poses a substantial risk to the system safety. In this study, we constructed an experimental system and performed numerical simulations to illustrate buoyancy (Bu) and thermal acceleration (Ac) effects on HTD of supercritical nitrogen (SCN2). The newly established thresholds for buoyancy and thermal acceleration (Buth=1.8×10−4 and Acth=4.4×10−5), considering pseudo two-phase characteristics, can effectively capture buoyancy and thermal acceleration in the first and second HTD regions. The first region is influenced by the combined effect of buoyancy and thermal acceleration, while the second region is mainly influenced by thermal acceleration. The new correlations and thresholds accurately predict the occurrence of HTD and the peak position. The experimental and simulation results contribute to understanding the impact of buoyancy and thermal acceleration on SCN2 HTD.

超临界低温流体在液态空气储能、高温超导电缆和高超音速飞行器发动机冷却等各行各业的各种应用中展现出巨大的潜力。传热恶化(HTD)对系统安全构成了巨大风险。在这项研究中,我们构建了一个实验系统并进行了数值模拟,以说明浮力(Bu)和热加速度(Ac)对超临界氮气(SCN2)传热恶化(HTD)的影响。考虑到伪两相特性,新建立的浮力和热加速度阈值(Buth=1.8×10-4 和 Acth=4.4×10-5)可有效捕捉第一和第二 HTD 区域的浮力和热加速度。第一个区域受浮力和热加速度的共同影响,而第二个区域主要受热加速度的影响。新的相关性和阈值能准确预测 HTD 的发生和峰值位置。实验和模拟结果有助于理解浮力和热加速度对 SCN2 HTD 的影响。
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引用次数: 0
High-pressure phase equilibrium for carbon dioxide solubility with biofuels: Experimental and thermodynamic insights in 2,5-dimethylfuran and methyl levulinate 生物燃料中二氧化碳溶解度的高压相平衡:2,5-二甲基呋喃和乙酰丙酸甲酯的实验和热力学见解
IF 3.4 3区 工程技术 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-08-13 DOI: 10.1016/j.supflu.2024.106378
Amal Ayad , Mojgan Ebrahiminejadhasanabadi , Wayne Michael Nelson , Latifa Negadi , Paramespri Naidoo

The solubility of carbon dioxide in two solvents, 2,5-dimethylfuran and methyl levulinate, were measured to high pressure, up to 9.1 MPa, at three different temperatures (283.15, 303.15 and 323.15) K. The new data were measured using both the isothermal synthetic technique and the variable volume synthetic method. Two methods were utilised to provide a level of data validation. The uncertainties in the measured data were critically estimated. The experimental phase equilibrium data were modeled using the Peng-Robinson equation of state and the Wong-Sandler mixing rule with a single set of binary interaction parameters for each system. The data indicated that the solubility of carbon dioxide in both 2,5-dimethylfuran and methyl levulinate at high pressures was relatively low, suggesting a low capacity of these biofuels to dissolve carbon dioxide at high pressure.

在三种不同温度(283.15、303.15 和 323.15)K 下测量了二氧化碳在 2,5-二甲基呋喃和乙酰丙酸甲酯两种溶剂中的高压溶解度,最高可达 9.1 兆帕。使用这两种方法提供了一定程度的数据验证。对测量数据的不确定性进行了严格估算。使用彭-罗宾逊状态方程和黄-桑德勒混合规则对实验相平衡数据进行建模,每个系统使用一组二元相互作用参数。数据表明,在高压下二氧化碳在 2,5-二甲基呋喃和乙酰丙酸甲酯中的溶解度相对较低,这表明这些生物燃料在高压下溶解二氧化碳的能力较低。
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引用次数: 0
Enhancing anti-diabetic activity and reducing cytotoxicity of T. crispa extracts through sustainable approach of pressurized hot water extraction and micelle-mediated separation 通过加压热水萃取和胶束介导分离的可持续方法提高酥树蕨提取物的抗糖尿病活性并降低其细胞毒性
IF 3.4 3区 工程技术 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-08-13 DOI: 10.1016/j.supflu.2024.106377
Kunat Suktham , Suvimol Surassmo , Chaisak Chansriniyom , Motonobu Goto , Artiwan Shotipruk

In this study, pressurized hot water extraction (PHWE) was evaluated for the recovery of anti-diabetic borapetoside C (BPC) from T. crispa stems. The maximum BPC extraction efficiency obtained at 100 ˚C, 2.5 MPa and 5.0 mL/min was considerably higher than that obtained by the conventional methods. Under optimized conditions, one-site kinetic desorption model could most accurately describe the PHWE behavior, suggesting an intra-particle diffusion-controlled mechanism. The undesirable compounds in the extract were further removed by micelle-mediated separation (MMS), in which Tween 80 was added, followed by NaCl addition and slight temperature increase to induce phase separation. At the most suitable MMS condition, with 0.028 mM Tween 80, 0.4 M NaCl, at 85 ˚C, the majority (87 %) of BPC could be recovered in the aqueous phase after 40 min. After MMS, the resulting extract exhibited low cytotoxicity against L6 and HepG2 cells while maintaining significant α-glucosidase and α-amylase inhibition activities.

本研究评估了加压热水萃取法(PHWE)从酥树茎中回收抗糖尿病的硼磷酯 C(BPC)的效果。在 100 ˚C、2.5 MPa 和 5.0 mL/min 条件下获得的最大 BPC 提取效率大大高于传统方法。在优化条件下,单位点动力学解吸模型能最准确地描述 PHWE 的行为,表明这是一种粒子内扩散控制机制。通过胶束介导分离(MMS)进一步去除提取物中的不良化合物,在此过程中加入吐温80,然后加入NaCl并略微升温以诱导相分离。在最合适的 MMS 条件下(0.028 mM Tween 80,0.4 M NaCl,85 ˚C),40 分钟后,水相中大部分(87%)的 BPC 得以回收。经 MMS 处理后,所得提取物对 L6 和 HepG2 细胞的细胞毒性较低,但仍具有显著的 α-葡萄糖苷酶和 α-淀粉酶抑制活性。
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引用次数: 0
Study of potassium deactivation rule in supercritical water gasification of coal with K2CO3 as catalyst 以 K2CO3 为催化剂的超临界水煤气化过程中钾失活规律研究
IF 3.4 3区 工程技术 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-08-12 DOI: 10.1016/j.supflu.2024.106375
Chenchen Zhou, Hui Jin, Zhiwei Ge, Liejin Guo

K2CO3 has a good catalytic effect in supercritical water gasification (SCWG) of coal. However, researchers have mainly focused on the effects of coal gasification, while the potassium mass transfer process has rarely been studied. Herein, the distribution pattern of potassium during the SCWG of coal and the factors influencing potassium deactivation were experimentally obtained. Through the detection and analysis of the residues after the SCWG of coal, it is found that potassium only exists in the forms of liquid and solid and the potassium in the residue exists in the form of insoluble potassium silica alumina, which does not have a catalytic effect. At a high reaction temperature, the reaction time is longer, and when the silica–aluminum content in coal is higher, the potassium deactivate rate is also higher. The molar contents of potassium and aluminum in the coal gasification residue are linearly correlated, with a ratio of approximately 1:1. Reducing the aluminum content in coal can effectively reduce potassium deactivation. In the SCWG of the Hebi coal, the deactivation rate of potassium reduced from 80.88 % to 17.75 % after acid washing. In the SCWG of the ash-free coal, the carbon gasification efficiency (CE) and potassium content in the liquid were above 95 % after each experiment, there was no deactivation of potassium, and the residual potassium solution remained catalytically effective after the SCWG of the ash-free coal.

K2CO3 在煤的超临界水气化(SCWG)中具有良好的催化作用。然而,研究人员主要关注煤的气化效果,而对钾的传质过程研究甚少。本文通过实验获得了煤在超临界水气化过程中钾的分布规律以及影响钾失活的因素。通过对煤炭超临界水分解后残留物的检测和分析,发现钾只以液态和固态两种形式存在,残留物中的钾以不溶性硅铝钾的形式存在,不具有催化作用。反应温度越高,反应时间越长,煤中硅铝含量越高,钾的失活率也越高。煤气化残渣中钾和铝的摩尔含量呈线性相关,比例约为 1:1。降低煤中铝的含量可以有效减少钾的失活。在鹤壁煤的 SCWG 中,酸洗后钾的失活率从 80.88% 降至 17.75%。在无灰份煤的SCWG中,每次实验后的碳气化效率(CE)和液体中的钾含量都在95%以上,钾没有失活,残留的钾溶液在无灰份煤的SCWG后仍然有效。
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引用次数: 0
Density and viscosity of orange peel oil saturated with pressurized CO2 加压二氧化碳饱和橙皮油的密度和粘度
IF 3.4 3区 工程技术 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-08-08 DOI: 10.1016/j.supflu.2024.106373
Mariana Fortunatti-Montoya , Pablo E. Hegel , Selva Pereda

In this work, we measure the density and viscosity of CO2 saturated orange peel oil liquid mixtures under moderated pressure for the purpose of supercritical process engineering design. A high-pressure falling weight viscometer is used to measure the viscosity of saturated liquid mixtures of orange oil + CO2 at different temperatures (293 K to 333 K) and saturated pressures (2 MPa to 10.3 MPa). An important variation of viscosity (0.35.10−3 Pa.s to 1.10 10−3 Pa.s) is reported in the range of operating conditions. Results show the operating temperature influences the viscosity of both the pure oil and the CO2-saturated oily substrates. The new viscosity data correlates with a simple Arrhenius modified type model.

在这项工作中,我们测量了二氧化碳饱和橘皮油液体混合物在适度压力下的密度和粘度,目的是进行超临界工艺工程设计。我们使用高压失重式粘度计测量了橘子油 + CO2 饱和液体混合物在不同温度(293 K 至 333 K)和饱和压力(2 MPa 至 10.3 MPa)下的粘度。据报告,在工作条件范围内,粘度的变化很大(0.35.10-3 Pa.s 至 1.10 10-3 Pa.s)。结果表明,工作温度会影响纯油和二氧化碳饱和油基的粘度。新的粘度数据与简单的阿伦尼斯改进型模型相关。
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引用次数: 0
Ultrasound pretreatment combined with supercritical CO2 extraction of Costus spicatus leaf extract 超声波预处理与超临界二氧化碳萃取相结合的木贼叶提取物
IF 3.4 3区 工程技术 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-08-07 DOI: 10.1016/j.supflu.2024.106372
Thaíris Karoline Silva Laurintino , Thuany Naiara Silva Laurintino , Deise Parolo Tramontin , Alexandre Bella Cruz , Debora Wainstein Paiva , Ariovaldo Bolzan , Marintho Bastos Quadri

This work aimed to obtain extracts from Costus spicatus leaves through ultrasonic pretreatment in supercritical CO2 extraction (UAE+SFE). A central composite design was used to evaluate the influence of temperature (36–64 °C), pressure (8–20 MPa), and cosolvent (0–20 %w) in terms of overall yield and chemical composition. Morphology using scanning electron micrograph (SEM), total phenolic content, content of total flavonoid, antioxidant (DPPH and ABTS), and antibacterial activities were evaluated. UAE+SFE showed a more notable overall yield, with 6.97 %. In the SEM, the sample treated with UAE+SFE significantly impacted tissue structures, improving the selectivity of SFE regarding linolenic acid, leading to a maximum composition value of 62.5 % area according to GC-MS. Furthermore, the UAE+SFE extract exhibited strong antimicrobial activity compared to the extract obtained by the SFE technique. Based on the pioneering results, the bioactives obtained are promising and interesting for application in the cosmetic, pharmaceutical, and food industries.

本研究旨在通过超临界二氧化碳萃取(UAE+SFE)中的超声波预处理从树叶中获得提取物。采用中心复合设计评估了温度(36-64 °C)、压力(8-20 MPa)和助溶剂(0-20 %w)对总收率和化学成分的影响。使用扫描电子显微镜(SEM)对其形态、总酚含量、总黄酮含量、抗氧化性(DPPH 和 ABTS)和抗菌活性进行了评估。UAE+SFE 的总收率较高,为 6.97%。在扫描电子显微镜下,用 UAE+SFE 处理过的样品对组织结构产生了显著影响,提高了 SFE 对亚麻酸的选择性,从而使 GC-MS 显示的最大成分值达到 62.5 %。此外,与通过 SFE 技术获得的提取物相比,UAE+SFE 提取物具有很强的抗菌活性。基于这些开创性的结果,所获得的生物活性物质有望在化妆品、制药和食品行业中得到应用。
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引用次数: 0
Effect of mild subcritical fluid treatment on meat quality of farmed large yellow croakers 温和亚临界流体处理对养殖大黄鱼肉质的影响
IF 3.4 3区 工程技术 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-08-05 DOI: 10.1016/j.supflu.2024.106370
Wenjie Wang , Danqing Jiang , Xiubiao Chen , Xuxia Zhou , Yuting Ding

Farmed large yellow croaker fish have stronger fishy smell and less tender texture than wild-caught ones, mostly caused by the high fat accumulation from aquaculture feeding patterns. To improve the commercial value of fillets, this study investigated a mild subcritical fluid treatment with subcritical butane (SBE) and dimethyl ether (SDME). Changes in the chemical compositions, volatile flavor compounds (VFCs) and protein denaturation were determined for 1–5 h treatments. The results showed 24 % and 44 % defatting levels under SBE and SDME treatment, respectively. GC-MS showed that SDME could induce a significant reduction of total VFC content, especially for the dominant aldehydes. There was less n-nonanal (14.65–40.13 mg/kg) and octanal content (1.67–7.21 mg/kg), no detection of trans, trans-2,4-decadienal in the SDME treated samples in comparison to those treated with SBE. The results showed that SDME treatment for 3 h had the best defatting effect, good deodorization effect and less degradation of fish protein.

与野生捕捞的大黄鱼相比,养殖的大黄鱼腥味更重、肉质更不鲜嫩,这主要是由于水产养殖投喂模式造成的高脂肪积累所致。为了提高鱼片的商业价值,本研究采用亚临界丁烷(SBE)和二甲醚(SDME)进行了温和的亚临界流体处理。测定了处理 1-5 小时后化学成分、挥发性风味化合物(VFCs)和蛋白质变性的变化。结果显示,SBE 和 SDME 处理的脱脂程度分别为 24% 和 44%。气相色谱-质谱(GC-MS)显示,SDME 能显著降低 VFC 的总含量,尤其是主要的醛类。与使用 SBE 处理的样品相比,SDME 处理的样品中正壬醛(14.65-40.13 毫克/千克)和辛醛(1.67-7.21 毫克/千克)含量较少,没有检测到反式、反式-2,4-癸二烯醛。结果表明,SDME 处理 3 小时的脱脂效果最好,除臭效果好,鱼肉蛋白质降解较少。
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引用次数: 0
Investigation of supercritical CO2 corrosion behavior of X80 carbon steel in pipelines: An in situ experimental and DFT study 管道中 X80 碳钢的超临界二氧化碳腐蚀行为研究:现场实验和 DFT 研究
IF 3.4 3区 工程技术 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-08-05 DOI: 10.1016/j.supflu.2024.106371
Xiaodan Wang , Pu Yang , Ruidong Li , Guohu Tong , Jukai Chen , Yueshe Wang

The electrochemical corrosion behavior of X80 carbon steel was investigated in a supercritical CO2 (sCO2) environment at 60 ℃ and 9 MPa, by in-situ experiments and density functional theory (DFT) calculations, revealing the corrosion mechanism. For in situ electrochemical measurements, two novel CO2-rich and H2O-rich cells were developed to replace the traditional three-electrode cell. Electrochemical impedance spectroscopy revealed distinct differences in the corrosion behavior between CO2-rich and H2O-rich environments during the later stages of testing. In H2O-rich environments, as corrosion time increased, the corrosion product layer gradually changed from porous to dense, eventually forming a protective layer. In CO2-rich environments, corrosion occurs mainly in areas where water condenses to form FeCO3. Simultaneously, microscopic calculations provided evidence for the three-step sCO2 hydrolysis mechanism and the formation of FeCO3 products.

通过原位实验和密度泛函理论(DFT)计算,研究了 X80 碳钢在 60 ℃ 和 9 MPa 的超临界 CO(sCO)环境中的电化学腐蚀行为,揭示了腐蚀机理。为进行原位电化学测量,开发了两种新型富含 CO 和 HO 的电池,以取代传统的三电极电池。电化学阻抗光谱显示,在测试的后期阶段,富含 CO 和富含 HO 环境中的腐蚀行为存在明显差异。在富含 HO 的环境中,随着腐蚀时间的延长,腐蚀产物层逐渐从多孔变为致密,最终形成保护层。在富含 CO 的环境中,腐蚀主要发生在水冷凝形成 FeCO 的区域。同时,微观计算为三步 sCO 水解机制和 FeCO 产物的形成提供了证据。
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引用次数: 0
期刊
Journal of Supercritical Fluids
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