Computer Simulations on Aggregation of Acetic Acid in the Gas Phase, Liquid Phase, and Supercritical Carbon Dioxide

2010 ◽  
Vol 114 (16) ◽  
pp. 5377-5388 ◽  
Author(s):  
Wenhao Xu ◽  
Jichu Yang
Keyword(s):  
Carbon Dioxide ◽  
Acetic Acid ◽  
Liquid Phase ◽  
Supercritical Carbon Dioxide ◽  
Gas Phase ◽  
Computer Simulations ◽  
Phase Liquid ◽  
Supercritical Carbon

scholarly journals Solubility of Anthraquinone Derivatives in Supercritical Carbon Dioxide: New Correlations

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 460
Author(s):  
Ratna Surya Alwi ◽  
Chandrasekhar Garlapati ◽  
Kazuhiro Tamura
Keyword(s):  
Carbon Dioxide ◽  
Liquid Phase ◽  
Supercritical Carbon Dioxide ◽  
Binary Systems ◽  
Relative Deviation ◽  
Anthraquinone Derivatives ◽  
New Models ◽  
Solubility Isotherms ◽  
Solid Liquid ◽  
Supercritical Carbon

Solubility of several anthraquinone derivatives in supercritical carbon dioxide was readily available in the literature, but correcting ability of the existing models was poor. Therefore, in this work, two new models have been developed for better correlation based on solid–liquid phase equilibria. The new model has five adjustable parameters correlating the solubility isotherms as a function of temperature. The accuracy of the proposed models was evaluated by correlating 25 binary systems. The proposed models observed provide the best overall correlations. The overall deviation between the experimental and the correlated results was less than 11.46% in averaged absolute relative deviation (AARD). Moreover, exiting solubility models were also evaluated for all the compounds for the comparison purpose.

Numerical Simulation of Supercritical Carbon Dioxide Critical Flow in the Nozzle Tube

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Zhou Yuan ◽  
Wang Yangle ◽  
Chen Jingtan ◽  
Xia Zhaoyang ◽  
Wang Junfeng
Keyword(s):  
Experimental Data ◽  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Gas Phase ◽  
Mass Flow ◽  
Critical Mass ◽  
Critical Flow ◽  
Supercritical Phase ◽  
Simulation Results ◽  
Supercritical Carbon

The supercritical carbon dioxide (S-CO2) Brayton gas turbine cycle has been studied as an efficient and cost-effective option for advanced power systems. One major safety issue for any power cycle is a pipe break and the associated discharge of the working fluid and subsequent decrease in system pressure. In this paper, an S-CO2 critical flow in the nozzle tube is analyzed numerically with fluent 15.0. The Redlich–Kwong real gas equation is selected to calculate carbon dioxide density and the standard k-epsilon turbulence model is selected. Experimental data are used as a benchmark to examine the capability of the current approach. Compared with experimental data, the simulation results overestimate the critical mass flux; the error range is between 15% and 25%. The simulation results show that as L/D increases, critical mass flow decreases. As stagnation temperature increases, critical mass flow decreases. The complex thermal hydraulic behavior in the nozzle tubes is analyzed. Three flow patterns in the nozzle tube during transient critical flow are obtained and discussed. From inlet to outlet of the tube, CO2 may undergo the following phases in turn: (1) supercritical phase; (2) supercritical phase—gas phase; (3) supercritical phase—gas phase—liquid phase. The simulation results are also helpful for further experimental and theoretical research.

scholarly journals Anti-Inflammatory Effect of Supercritical-Carbon Dioxide Fluid Extract from Flowers and Buds ofChrysanthemum indicumLinnén

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Xiao-Li Wu ◽  
Chu-Wen Li ◽  
Hai-Ming Chen ◽  
Zu-Qing Su ◽  
Xiao-Ning Zhao ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Acetic Acid ◽  
Chemical Composition ◽  
Supercritical Carbon Dioxide ◽  
Granuloma Formation ◽  
Ear Edema ◽  
Cotton Pellet ◽  
Anti Inflammatory ◽  
Inflammatory Effect ◽  
Supercritical Carbon

The aim of this study was to analyze the chemical composition and investigate the anti-inflammatory property of the supercritical-carbon dioxide extract from flowers and buds ofC. indicum(CISCFE). The anti-inflammatory effect was evaluated in four animal models including xylene-induced mouse ear edema, acetic acid-induced mouse vascular permeability, carrageenan-induced mouse hind paw edema, and cotton pellet-induced rat granuloma formation. The results indicated that CISCFEsignificantly attenuated xylene-induced ear edema, decreased acetic acid-induced capillary permeability, reduced carrageenan-induced paw, and inhibited the cotton pellet-induced granuloma formation in a dose-dependent manner. Histopathologically, CISCFEabated inflammatory response of the edema paw. Preliminary mechanistic studies demonstrated that CISCFEdecreased the MDA level via increasing the activities of anti-oxidant enzymes (SOD, GPx, and GRd), attenuated the productions of NF-κB, TNF-α, IL-1β, IL-6, PGE2and NO, and suppressed the activities of iNOS and COX-2. In phytochemical study, 35 compounds were identified by GC-MS, and 5 compounds (chlorogenic acid, luteolin-7-glucoside, linarin, luteolin and acacetin) were reconfirmed and quantitatively determined by HPLC-PAD. This paper firstly analyzed the chemical composition by combining GC-MS with HPLC-PAD and explored possible mechanisms for the anti-inflammatory effect of CISCFE.

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