Expert and gray box modeling of high pressure liquid carbon dioxide extraction of Pimpinella anisum L. seed

2012 ◽  
Vol 72 ◽  
pp. 213-222 ◽  
Author(s):  
Meysam Davoody ◽  
Gholamreza Zahedi ◽  
Mazda Biglari ◽  
M.A.A. Meireles ◽  
Alireza Bahadori
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Liquid Carbon ◽  
Liquid Carbon Dioxide ◽  
Pimpinella Anisum ◽  
Carbon Dioxide Extraction

Effects of supercritical and liquid carbon dioxide extraction on hemp ( Cannabis sativa L.) seed oil

2020 ◽  
Vol 55 (6) ◽  
pp. 2472-2480
Author(s):  
Alessandra Aiello ◽  
Fabiana Pizzolongo ◽  
Giorgio Scognamiglio ◽  
Annalisa Romano ◽  
Paolo Masi ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Seed Oil ◽  
Cannabis Sativa ◽  
Liquid Carbon ◽  
Liquid Carbon Dioxide ◽  
Carbon Dioxide Extraction

scholarly journals Mechanism Analysis of Liquid Carbon Dioxide Phase Transition for Fracturing Rock Masses

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2909 ◽  
Author(s):  
Feng Gao ◽  
Leihu Tang ◽  
Keping Zhou ◽  
Yanan Zhang ◽  
Bo Ke
Keyword(s):  
Phase Transition ◽  
Carbon Dioxide ◽  
High Pressure ◽  
Initial Stress ◽  
Initial Pressure ◽  
Initial Crack ◽  
Stress Waves ◽  
Mechanism Analysis ◽  
Liquid Carbon ◽  
Liquid Carbon Dioxide

The technique of breaking rocks using carbon dioxide phase transition technology is being widely applied in current research. This article combines theoretical and practical methods to analyze the mechanism by which high-pressure gas breaks rock at different stages. Using the observation that liquid carbon dioxide forms a high-pressure jet from release holes at the moment of release, a formula for calculating the initial pressure on the wall in the direction of release was obtained, and the pattern of initial crack formation on the borehole wall under different initial stress conditions was examined. An experiment using carbon dioxide phase transition technology to fracture rock without an initial stress field was conducted. The mechanism of generation and expansion of subsequent cracks under stress waves and high-pressure gas was analyzed, and the formula for calculating crack propagation radius under stress waves was obtained. The results suggested that under the quasi-static action of high-pressure gas, cracks begin to develop when the stress intensity factor KI at the crack tip is equal to or greater than the fracture toughness KIC of the rock.

scholarly journals Modeling of the thyme: Liquid carbon dioxide extraction system

2003 ◽  
pp. 125-133 ◽  
Author(s):  
Zoran Zekovic ◽  
Zika Lepojevic ◽  
Svetlana Milosevic ◽  
Aleksandar Tolic
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Essential Oil ◽  
Steam Distillation ◽  
Extraction System ◽  
Thymus Vulgaris ◽  
Liquid Carbon ◽  
Liquid Carbon Dioxide ◽  
Carbon Dioxide Extraction ◽  
Modified Equation

The extraction of thyme (Thymus vulgaris L) by liquid carbon dioxide was investigated. The obtained extracts were analyzed by HPLC and GC-MS methods, and their composition was compared with that of the essential oil obtained by steam distillation and by supercritical carbon dioxide at 100 bar and 40?C. To model extraction of the thyme - liquid carbon dioxide system, we used the Reverchon - Sesti Osseo equation, as well as our modified equation.

scholarly journals Experimental Study on Explosion Pressure and Rock Breaking Characteristics under Liquid Carbon Dioxide Blasting

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Yanan Zhang ◽  
Junren Deng ◽  
Bo Ke ◽  
Hongwei Deng ◽  
Jielin Li
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Free Field ◽  
Jet Impingement ◽  
Rock Breaking ◽  
Tensile Failure ◽  
Liquid Carbon ◽  
Liquid Carbon Dioxide ◽  
Explosion Pressure ◽  
The Impact

A liquid carbon dioxide blasting experiment was carried out under free field conditions, alongside a liquid carbon dioxide rock breaking experiment, to investigate explosion pressure variation and rock breaking characteristics under liquid carbon dioxide blasting. The experimental results show that the internal and external explosion pressures of the liquid carbon dioxide fracturing devices all rapidly increased at first, before attenuating vibrantly after blasting. When the explosion pressure was raised, the internal explosion pressure increased first exponentially and then linearly, while the external explosion pressure increased exponentially throughout. The duration time of the blasting effect stage was about 45 ms. Under the combined effect of jet impingement and a gas wedge of high-pressure carbon dioxide, the rock is subjected to tensile failure. The impact failure and the “gas wedge effect” of high-pressure carbon dioxide play a key role in the rock breaking of liquid carbon dioxide blasting technology.

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