scholarly journals Extraction of Organic Volatile Pollutants in Over-Saturated Water by Pervaporation Technique Using a Poly (Dimethylsiloxane)-Based Sealer as a Membrane

Water ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1049
Author(s):  
Wafa Nazzal Alharbi ◽  
Waseem Sharaf Saeed ◽  
Abdulrahman A. Alwarthan ◽  
Ahmed Yacine Badjah-Hadj-Ahmed ◽  
Taieb Aouak
Keyword(s):  
Organic Liquid ◽  
Separation Process ◽  
Alkyl Halides ◽  
Polluted Water ◽  
Membrane Thickness ◽  
Optimal Conditions ◽  
Organic Mixture ◽  
Saturated Water ◽  
Volatile Organic ◽  
Organic Products

SILICONE1200 is an inexpensive domestic poly (dimethylsiloxane)-based sealer that was used in this study to remove volatile organic compounds from over-saturated water using the pervaporation technique. A series of volatile organic liquid compounds representing an important part of polluting organic products released every day in water were chosen for this study. These products were alkyl halides (chloroform), aromatics (toluene), aliphatic hydrocarbons (heptanes), ketones and aldehydes (butanone), and organosulfides (thiophene). The mass transfer of these compounds and their mixtures through the SILICONE1200 membrane was assessed to predict the results of the separation process. The results indicate that the mechanism of diffusion obeyed a Fickian model. Different parameters affecting the pervaporation results, such as the membrane thickness, stirring rate, and temperature, were examined to determine the optimal conditions in terms of the total flux and selectivity. The optimized parameters were then applied to the separation of an organic mixture from polluted water using the dynamic pervaporation process with promising results.

Behavior of Volatile Organic Liquid Mixtures in the Soil Environment

1998 ◽  
pp. 37-58 ◽  
Author(s):  
B. Yaron ◽  
I. Dror ◽  
E. Graber ◽  
J. Jarsjo ◽  
P. Fine ◽  
...  
Keyword(s):  
Organic Liquid ◽  
Liquid Mixtures ◽  
Soil Environment ◽  
Volatile Organic

scholarly journals Optimization of lupine hydrolyzate separation

2019 ◽  
Vol 292 ◽  
pp. 01026
Author(s):  
Jiří Pecha ◽  
Jakub Husár ◽  
Miloš Jelínek ◽  
Lubomír Šánek ◽  
Karel Kolomazník
Keyword(s):  
Mathematical Model ◽  
Mass Distribution ◽  
Molar Mass ◽  
Separation Process ◽  
Degree Of Hydrolysis ◽  
Optimal Conditions ◽  
Mixture Separation ◽  
Process Simulations ◽  
Promising Source ◽  
Hydrolysis Of

Lupine hydrolyzate is a promising source of proteins. Hydrolysis of lupine flour was studied under various conditions and their influence on reaction mixture separation by means of filtration was assessed. A mathematical model describing separation process was suggested and verified. This model was used in further calculations and process simulations. It was shown, that the filtration largely depends on the molar mass distribution, respectively the degree of hydrolysis. In addition, an approach enabling optimizing filtration was presented. The time of filtration performed at optimal conditions was almost ten times decreased.

scholarly journals The sensitivity of secondary organic aerosol component partitioning to the predictions of component properties – Part 1: A systematic evaluation of some available estimation techniques

2010 ◽  
Vol 10 (21) ◽  
pp. 10255-10272 ◽  
Author(s):  
G. McFiggans ◽  
D. O. Topping ◽  
M. H. Barley
Keyword(s):  
Molar Mass ◽  
Estimation Method ◽  
Organic Aerosol ◽  
Systematic Evaluation ◽  
Complex Behaviour ◽  
Organic Mixture ◽  
Number Of Components ◽  
Activity Coefficient Model ◽  
Highly Sensitive ◽  
Volatile Organic

Abstract. A large number of calculations of the absorptive partitioning of organic compounds have been made using a number of methods to predict the component vapour pressures, p0, and activity coefficients, γi, required in the calculations. The sensitivities of the predictions in terms of the condensed component masses, volatility, O:C ratio, molar mass and functionality distributions to the choice of p0 and γi models and to the number of components to represent the organic mixture have been systematically compared. The condensed component mass was found to be highly sensitive to the vapour pressure model, and less sensitive to both the activity coefficient model and the number of components used to represent the mixture although the sensitivity to the change in property estimation method increased substantially with increased simplification in the treatment of the organic mixture. This was a general finding and was also clearly evident in terms of the predicted component functionality, O:C ratio, molar mass and volatility distributions of the condensed organic components. Within the limitations of the study, this clearly demonstrates the requirement for more accurate representation of the p0 and γi of the semi-volatile organic proxy components used in simplified models as the degree of simplification increases. This presents an interesting paradox, since such reduction in complexity necessarily leads to divergence from the complex behaviour of real multicomponent atmospheric aerosol.

scholarly journals An Efficient Ionic Liquid-Mediated Extraction and Enrichment of Isoimperatorin from Ostericum koreanum (Max.) Kitagawa

Molecules ◽  
2021 ◽  
Vol 26 (21) ◽  
pp. 6555
Author(s):  
Alice Nguvoko Kiyonga ◽  
Gyu Hwan Park ◽  
Hyun Su Kim ◽  
Young-Ger Suh ◽  
Tae Kon Kim ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Crystallization Process ◽  
Raw Material ◽  
Optimal Conditions ◽  
Volatile Organic ◽  
Significant Interest ◽  
Ostericum Koreanum ◽  
One Step ◽  
Central Composite ◽  
Step Crystallization

Ionic liquids (ILs) have attracted significant interest because of their desirable properties. These characteristics have improved their application to overcome the shortcomings of conventional separation techniques for phytochemicals. In this study, several ILs were investigated for their capacity to extract isoimperatorin, a bioactive furanocoumarin, from the roots of Ostericum koreanum. Herein, 1-Butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]) was selected as a promising IL for separating isoimperatorin. A central composite design was applied to optimize the extraction conditions. Under the optimal conditions, the yield of isoimperatorin reached 97.17 ± 1.84%. Additionally, the recovery of isoimperatorin from the [Bmim][BF4] solution was successfully achieved (87.73 ± 2.37%) by crystallization using water as an antisolvent. The purity of the isoimperatorin was greatly enhanced, from 0.26 ± 0.28% in the raw material to 26.94 ± 1.26% in the product, in a one-step crystallization process. Namely, an enhancement of approximately 103-folds was reached. The developed approach overcomes the shortcomings of conventional separation methods applied for gaining isoimperatorin by significantly reducing the laboriousness of the process and the consumption of volatile organic solvents. Moreover, the simplicity and effectiveness of the method are assumed to be valuable for producing isoimperatorin-enriched products and for promoting its purification. This work also confirms the efficiency of ILs as a promising material for the separation of phytochemicals.

Hydrotropic Extraction of Xanthones from Mangosteen Pericarp

2014 ◽  
Vol 984-985 ◽  
pp. 372-376 ◽  
Author(s):  
D. Gnana Prakash ◽  
Pradeep Panneerselvam ◽  
Sai Madhusudanan ◽  
V. Aditya
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Sodium Salicylate ◽  
Cost Effective ◽  
Separation Process ◽  
Extraction Technique ◽  
Solid Loading ◽  
Extraction Temperature ◽  
Optimal Conditions

A novel separation process for extraction of xanthones from mangosteen pericarp was investigated using aqueous hydrotrope solution. The hydrotropes sodium salicylate was used for the extraction. The effects of factors such as hydrotrope concentration, extraction temperature and solid loading were investigated by using Response Surface Methodology (RSM). The optimal conditions to obtain the highest yield of xanthones were 2M sodium salicylate, extraction temperature of 40°C and 3% solid loading. This hydrotropic extraction technique is simple and cost effective for the separation of bioactive compounds.Key words: Xanthones; Hydrotropes; Hydrotropic extraction

Exposure of Humans to a Volatile Organic Mixture. I. Behavioral Assessment

1992 ◽  
Vol 47 (1) ◽  
pp. 23-30 ◽  
Author(s):  
David A. Otto ◽  
H. Kenneth Hudnell ◽  
Dennis E. House ◽  
Lars Mølhave ◽  
Wayne Counts
Keyword(s):  
Behavioral Assessment ◽  
Organic Mixture ◽  
Volatile Organic

scholarly journals The sensitivity of secondary organic aerosol component partitioning to the predictions of component properties – Part 1: A systematic evaluation of some available estimation techniques

2010 ◽  
Vol 10 (6) ◽  
pp. 15379-15415 ◽  
Author(s):  
G. McFiggans ◽  
D. O. Topping ◽  
M. H. Barley
Keyword(s):  
Molar Mass ◽  
Estimation Method ◽  
Organic Aerosol ◽  
Systematic Evaluation ◽  
Complex Behaviour ◽  
Organic Mixture ◽  
Number Of Components ◽  
Activity Coefficient Model ◽  
Highly Sensitive ◽  
Volatile Organic

Abstract. A large number of calculations of the absorptive partitioning of organic compounds have been made using a number of methods to predict the component vapour pressures, p0, and activity coefficients, γi, required in the calculations. The sensitivities of the predictions in terms of the condensed component masses, volatility, O:C ratio, molar mass and functionality distributions to the choice of p0 and γi models and to the number of components to represent the organic mixture have been systematically compared. The condensed component mass was found to be highly sensitive to the vapour pressure model, and less sensitive to both the activity coefficient model and the number of components used to represent the mixture although the sensitivity to the change in property estimation method increased substantially with increased simplification in the treatment of the organic mixture. This was a general finding and was also clearly evident in terms of the predicted component functionality, O:C ratio, molar mass and volatility distributions of the condensed organic components. Within the limitations of the study, this clearly demonstrates the requirement for more accurate representation of the p0 and γi of the semi-volatile organic proxy components used in simplified models as the degree of simplification increases. This presents an interesting paradox, since such reduction in complexity necessarily leads to divergence from the complex behaviour of real multicomponent atmospheric aerosol.

Exposure of Humans to a Volatile Organic Mixture. II. Sensory

1992 ◽  
Vol 47 (1) ◽  
pp. 31-38 ◽  
Author(s):  
H. Kenneth Hudnell ◽  
David A. Otto ◽  
Dennis E. House ◽  
Lars Mølhave
Keyword(s):  
Organic Mixture ◽  
Volatile Organic
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