scholarly journals Supercritical carbon dioxide hop extraction

2005 ◽  
pp. 111-122 ◽  
Author(s):  
Ivana Pfaf-Sovljanski ◽  
Olgica Grujic ◽  
Mihailo Perunicic ◽  
Ivana Cvetkovic ◽  
Zoran Zekovic
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Empirical Model ◽  
Characteristic Time ◽  
Model Equation ◽  
Experimental Results ◽  
Sphere Model ◽  
Time Model ◽  
Single Sphere ◽  
Supercritical Carbon

The hop of Magnum cultivar was extracted using supercritical carbon dioxide (SFE-as extractant). Extraction was carried out in the two steps: the first one being carried out at 150 bar and 40?C for 2.5 h (Extract A), and the second was the extraction of the same hop sample at 300 bar and 40?C for 2.5 h (Extract B). Extraction kinetics of the system hop-SFE-CO2 was investigated. Two of four most common compounds of hop aroma (?-humulene and ?-caryophyllene) were detected in Extract A. Isomerised ?-acids and ?-acids were detected too. a-Acid content in Extract B was high (that means it is a bitter variety of hop). Mathematical modeling using empirical model characteristic time model and simple single sphere model has been performed on Magnum cultivar extraction experimental results. Characteristic time model equations, best fitted experimental results. Empirical model equation, fitted results well, while simple single sphere model equation poorly approximated the results.

scholarly journals Single sphere model fitting of supercritical carbon dioxide extraction from Quercus infectoria galls

2017 ◽  
Vol 13 (4) ◽  
pp. 821-824 ◽  
Author(s):  
Hasmida Mohd Nasir ◽  
Liza Md Salleh ◽  
Muhammad Syafiq Hazwan Ruslan ◽  
Mohd Amzar Mohamed Zahari
Keyword(s):  
Carbon Dioxide ◽  
Mass Transfer ◽  
Supercritical Carbon Dioxide ◽  
Model Fitting ◽  
Mass Transfer Process ◽  
Absolute Methanol ◽  
Sphere Model ◽  
Single Sphere ◽  
Postpartum Recovery ◽  
Supercritical Carbon

Q. infectoria galls, locally knowns as ‘manjakani’ in Malaysia and Indonesia, is a traditional medicine commonly used for postpartum recovery due to its strong astringency. The astringent properties of Q. infectoria galls is due to the high amount of tannin available in the extract. In this study, supercritical carbon dioxide (SC-CO2) with the presence of absolute methanol (1:3 w/v) was used for the extraction of Q. infectoria galls. The SC-CO2 extraction of the galls involve the diffusion and mass transfer process, represented by the value of diffusion coefficient (De) and the external mass transfer coefficient (kf). Single sphere model (SSM) was adapted and fitted into the experimental data, and De was found to be in the range of 0.91 ×10-11 to 9.99 × 10-11 m2/s. The linear driving force approximation was used to determine the kf values, which calculated to be in the range of 4.60 ×10-6 m/s to 9.50 ×10-6 m/s. SSM also pointed out that the SC-CO2 extraction of Q. infectoria galls is governed by internal diffusion with Biot number (Bi) greater than 10.  

A five-parameter empirical model for correlating the solubility of solid compounds in supercritical carbon dioxide

2016 ◽  
Vol 411 ◽  
pp. 74-80 ◽  
Author(s):  
Xiao-Qiang Bian ◽  
Qian Zhang ◽  
Zhi-Min Du ◽  
Jing Chen ◽  
Jean-Noël Jaubert
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Empirical Model ◽  
Solid Compounds ◽  
Supercritical Carbon

Representing solute solubility in supercritical carbon dioxide: A novel empirical model

2015 ◽  
Vol 93 ◽  
pp. 355-365 ◽  
Author(s):  
Milad Asgarpour Khansary ◽  
Farshad Amiri ◽  
Ashkan Hosseini ◽  
Ahmad Hallaji Sani ◽  
Hossein Shahbeig
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Empirical Model ◽  
Supercritical Carbon

In situ FTIR experimental results in the silylation of low-k films with hexamethyldisilazane dissolved in supercritical carbon dioxide

2014 ◽  
Vol 90 ◽  
pp. 134-143 ◽  
Author(s):  
Eduardo Vyhmeister ◽  
Lorenzo Reyes-Bozo ◽  
Héctor Valdés-González ◽  
José-Luis Salazar ◽  
Anthony Muscat ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Experimental Results ◽  
In Situ Ftir ◽  
Low K ◽  
Supercritical Carbon

The Research of Cleaning Process for Supercritical Carbon Dioxide Dyeing Equipment

2014 ◽  
Vol 1048 ◽  
pp. 515-518 ◽  
Author(s):  
Yan Yan Xu ◽  
Shi Hui Gao ◽  
Lai Jiu Zheng ◽  
Juan Zhang ◽  
Bing Du ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Experimental Results ◽  
Cleaning Process ◽  
Supercritical Carbon

A cleaning process for dyeing apparatus was investigated by employed a self-developed supercritical equipment. The solubility of C.I. Disperse Red 167 was evaluated with acetone, ethanol and carbinol in supercritical carbon dioxide at temperatures of 60, 80,100 and 120 °C and pressures ranging from 12 to 28 MPa. As revealed from the experimental results, the optimal cleaning conditions were as follows: cleaning temperature 100 °C, cleaning pressure 18 MPa, and cleaning time 40 min. Acetone was the most suitable cosolvent and the best cleaning effect was obtained when its concentration was 1%.

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