Organic template removal from hexagonal mesoporous silica by means of methanol-enhanced CO2 extraction: Effect of temperature, pressure and flow rate

Huang, Zhen; Xu, Li; Li, Jinghuan; Kawi, Sibudjing; Goh, Ai‐Ting

doi:10.1016/j.seppur.2010.11.029

Cited by 21 publications

(15 citation statements)

References 35 publications

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“…The high pressure and temperature increased the solubility and diffusivity of the egusi oil so that the mass transfer resistance decreased (Martins et al., 2015). A steady high carbon dioxide flow rate of 30 g/hr in this study increased convection, such that the mass transfer resistance decreased (Eckert et al., 1995; Huang et al., 2011). This could also be due to the high solubility of the fluid phase which is due to a high driving force exerted on the solid material (Santos et al., 2017).…”

Section: Resultsmentioning

confidence: 77%

Physicochemical and fatty acid profile of egusi oil from supercritical carbon dioxide extraction

Olubi

Felix-Minnaar

Jideani

2019

Heliyon

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Oil extraction from egusi seeds using supercritical CO2 extraction method was performed using series of operational parameters, temperature (55, 60, 75 °C), flow rate (30 g/h) and pressure (450, 600 bar). Egusi oil (EO) extracted at 60 °C, 30 g/h and 450 bar (EO1); 55 °C, 30 g/h and 600 bar (EO2) and 75 °C, 30 g/h and 600 bar (EO3) were investigated in a plant scale supercritical equipment. The fatty acid composition of egusi oil was analysed using gas chromatography, with result showing a high linoleic acid approximately (53%) and oleic acids (19%). The index of atherogenicity (IA%) and thrombogenicity index (IT %) were significantly low for the three oil samples, indicating its health benefits. Oxidative stability of egusi oil was analysed by Methrohm 743 Rancimat, confirming a less oxidised oil. Hence, egusi oil can be used as a raw material in dietary supplements and as a functional oil in the food industry.

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Section: Resultsmentioning

confidence: 77%

Physicochemical and fatty acid profile of egusi oil from supercritical carbon dioxide extraction

Olubi

Felix-Minnaar

Jideani

2019

Heliyon

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“…As upercritical fluid extraction with CO 2 is also successful to eliminate organic speciesf rom porousf rameworks. [79,95] The supercritical extractioni sp erformed under autogenous pressure in ac ertain range of high temperature. The working temperature of the supercriticalf luid affects the extraction efficiency.…”

Section: Solvent Extractionmentioning

confidence: 99%

“…A supercritical fluid extraction with CO 2 is also successful to eliminate organic species from porous frameworks . The supercritical extraction is performed under autogenous pressure in a certain range of high temperature.…”

Section: Template Removal and Its Influence On Shrinkagementioning

confidence: 99%

Analytical Understanding of the Materials Design with Well‐Described Shrinkages on Multiscale

Dutta

et al. 2018

Chemistry A European J

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Shrinkages derived from condensation of frameworks are one of the significant steps for fabricating demanded materials having unique morphologies and properties. Enormous efforts have been dedicated to understanding their mechanisms that are quite useful for the materials design. In this context, diversified measuring and observing tools have been facilitated to evaluate structural contractions and corresponding driving forces. All of the investigations are crucial to encourage the utilization of such shrinkages for the precise design of nanomaterials. In this review, we summarize significant works how to analyze shrinkages in multiscale during the synthesis of materials, which will be useful as a follow-up review to our latest contribution. Well-defined porous materials are also selected as a good candidate for understanding well-described shrinkages. This review aims to provide a detailed glimpse of the development of analyses on shrinking behaviors in multiscale for the materials design. Shrinking degree and direction in multiscale, which are driven by condensation of frameworks, are predominant for understanding and/or predicting final nanostructures of materials after shrinkages.

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“…According to preliminary studies, temperature and pressure play a pivotal role in the extraction process using SC-CO 2 [10]. Besides, cosolvent concentration and CO 2 flow rate have been reported as positive factors, having great impacts on extraction yields [17].…”

Section: Introductionmentioning

confidence: 99%

Supercritical Fluid Extraction of Polyphenols from Vietnamese Callisia fragrans Leaves and Antioxidant Activity of the Extract

Phan

Nguyen

Thanh

et al. 2020

Journal of Chemistry

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Vietnamese Callisia fragrans (C. fragrans) has been considered as a valuable traditional plant with various medicinal properties. In this study, polyphenols were extracted from Vietnamese C. fragrans leaves by supercritical carbon dioxide (SC-CO2) extraction method using ethanol as a cosolvent. The investigation of four factors influencing the total polyphenol content (TPC) and antioxidant activity of the extracts obtained from each single-factor experiment was conducted including ethanol concentration, CO2 flow rate, extraction temperature, and pressure. Besides, the extraction efficiency of the SC-CO2 method under the best extraction conditions, namely ethanol concentration of 14%, CO2 flow rate of 20 g/min, extraction temperature of 45°C, and pressure of 200 bar was compared to that of the Soxhlet extraction (SE) method in terms of the TPC and antioxidant activity of the extracts. The results showed that using SC-CO2 method, the TPC and the half-maximal inhibitory concentration value obtained were of 87.42 ± 1.33 mg/g and 243.83 ± 5.30 μM TE/g, respectively, with much less time and solvent amount required while that obtained using SE method were of 85.34 ± 4.27 mg/g and 236.33 ± 7.66 μM TE/g, respectively. This indicated that SC-CO2 would be suitable for the industrial production of polyphenols with high antioxidant activity of the extracts obtained due to the restrictions of using the SE method and advantages of applying SC-CO2 method. Therefore, SC-CO2 method could be regarded as a potentially upcoming extraction technique which might be employed to replace the conventional SE method.

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Organic template removal from hexagonal mesoporous silica by means of methanol-enhanced CO2 extraction: Effect of temperature, pressure and flow rate

Cited by 21 publications

References 35 publications

Physicochemical and fatty acid profile of egusi oil from supercritical carbon dioxide extraction

Physicochemical and fatty acid profile of egusi oil from supercritical carbon dioxide extraction

Analytical Understanding of the Materials Design with Well‐Described Shrinkages on Multiscale

Supercritical Fluid Extraction of Polyphenols from Vietnamese Callisia fragrans Leaves and Antioxidant Activity of the Extract

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