A New Empirical Model for Calculation the Effective Diffusion Coefficient for Solid–Liquid Extraction from Plants

2014 ◽  
Vol 53 (15) ◽  
pp. 6288-6296 ◽  
Author(s):  
Chavdar Chilev ◽  
Velichka Koleva ◽  
Evgeni Simeonov
Keyword(s):  
Diffusion Coefficient ◽  
Empirical Model ◽  
Effective Diffusion Coefficient ◽  
Effective Diffusion ◽  
Liquid Extraction ◽  
Solid Liquid Extraction ◽  
Solid Liquid

scholarly journals Continuous or Batch Solid-Liquid Extraction of Antioxidant Compounds from Seeds of Sterculia apetala Plant and Kinetic Release Study

Molecules ◽  
2018 ◽  
Vol 23 (7) ◽  
pp. 1759 ◽  
Author(s):  
Federica Mosca ◽  
Gádor Hidalgo ◽  
Juliana Villasante ◽  
María Almajano
Keyword(s):  
Diffusion Rate ◽  
Effective Diffusion ◽  
Antioxidant Properties ◽  
Chemical Species ◽  
Liquid Extraction ◽  
Process Time ◽  
Total Phenolic ◽  
Antioxidant Compounds ◽  
Solid Liquid Extraction ◽  
Solid Liquid

This work has been intended to investigate the antioxidant properties of compounds extracted from seeds of Sterculia apetala (a plant from Central America) in order to add further results to the relatively poor existing literature on the beneficial properties of this plant. Different extraction methodologies were used such as batch or continuous extraction conditions using water or ethanol 50% as solvents. The kinetic study has allowed estimation of the effective diffusion coefficients in a continuous solid-liquid extraction, highlighting the strict dependence of the diffusion rate and temperature and kind of solvent, showing the highest diffusion rate with ethanol 50% at 60 °C. The comparison between different techniques and two solvents led to the selection of water as the best extraction solvent while batch mechanically-agitated extraction was the most efficient mode, with the benefits of use of an environmental-friendly solvent and reduction in process time to achieve a high amount of extracted phenolic compounds. The analysis techniques used were ABTS and Folin-Ciocalteau methods to investigate the antioxidant activity and quantify the Total Phenolic Content (TPC) respectively. Also, different fatty acids were extracted from Sterculia apetala seeds and analysed by Gas Chromatography in order to quantify other interesting chemical species besides antioxidants.

Rotation planar extraction and medium-pressure solid-liquid extraction of onion (Allium cepa)

2003 ◽  
Vol 16 (1) ◽  
pp. 66-70 ◽  
Author(s):  
Irena Vovk ◽  
Breda Simonovska ◽  
Samo Andrenšek ◽  
Teijo Yrjönen ◽  
Pia Vuorela ◽  
...  
Keyword(s):  
Allium Cepa ◽  
Liquid Extraction ◽  
Medium Pressure ◽  
Solid Liquid Extraction ◽  
Solid Liquid

MASS TRANSFER IN SOLID-LIQUID EXTRACTION AT HIGH SOLUTE CONCENTRATIONS

2018 ◽  
Vol 17 (4) ◽  
pp. 827-839
Author(s):  
Eugenia Teodora Iacob Tudose ◽  
Marcela Popa ◽  
Ioan Mamaliga
Keyword(s):  
Mass Transfer ◽  
Liquid Extraction ◽  
Solid Liquid Extraction ◽  
Solid Liquid

Ultrasound Assisted Solid-Liquid Extraction Devices - Harnessing Active Ingredients from Plant materials – Overview and Analysis

2020 ◽  
Vol 13 ◽  
Author(s):  
Venkatasubramanian Sivakumar
Keyword(s):  
Mass Transfer ◽  
Cell Wall ◽  
Plant Cell ◽  
Plant Cell Wall ◽  
Liquid Extraction ◽  
Active Ingredients ◽  
Plant Materials ◽  
Ultrasound Assisted ◽  
Solid Liquid Extraction ◽  
Solid Liquid

Background: In the growing environmental concern use of natural products, efficient processes and devices are necessary. Solid-Liquid extraction of active Ingredients from Plant materials is one of the important unit operations in Chemical Engineering and need to be enhanced. Objectives: Since, these active ingredients are firmly bound to the plant cell wall membrane, which pose mass-transfer resistance and need to get detached through the use of suitable process intensification tools such as ultrasound and suitable devices. Therefore, detailed analysis and review is essential on development made in this area through Publications and Patents. Hence, the present paper illustrates the development of ultrasound assisted device for solid-liquid extraction are presented in this paper. Methods: Advantages such as % Yield, Reduction in extraction time, use of ambient conditions, better process control, avoidance or minimizing multi stage extraction could be achieved due to the use of ultrasound in extraction as compared to conventional processes. Conclusions: Use of ultrasound to provide significant improvements in the extraction of Vegetable tannins, Natural dyes for application in Leather processing has been demonstrated and reported earlier. These enhancement could be possible through various effects of ultrasound such as better flow of solvents through micro-jet formation, mass transfer enhancement due to rupture of plant cell wall membranes through acoustic cavitation, better leaching due to micro-mixing and acoustic streaming effects. This approach would minimize material wastage; thereby, leading to eco-conservation of plant materials, which is very much essential for better environment. Hence, various methods and design for application of ultrasound assisted solid-liquid extractor device are necessary.

Superiority of polymeric scavenger over its hexapodal monomer towards efficient ReO4- removal in water

2021 ◽  
Author(s):  
Pradyut Ghosh ◽  
Rajib Ghosh ◽  
Tamal Kanti Ghosh
Keyword(s):  
Aqueous Medium ◽  
Liquid Extraction ◽  
Efficient Removal ◽  
Solid Liquid Extraction ◽  
Solid Liquid

A new imidazolium functionalized hexapodal polymeric receptor, [PHIm-Br] showed selective and efficient removal (>99%) of perrhenate (ReO4-), from 100% aqueous medium via solid-liquid extraction which was 13% higher as compared...

Diffusion of Heavy Oil in SiO2 Model Catalyst and FCC Catalyst

2012 ◽  
Vol 550-553 ◽  
pp. 158-163 ◽  
Author(s):  
Zi Yuan Liu ◽  
Sheng Li Chen ◽  
Peng Dong ◽  
Xiu Jun Ge
Keyword(s):  
Diffusion Coefficient ◽  
Pore Size ◽  
Effective Diffusion Coefficient ◽  
Pore Diameter ◽  
Effective Diffusion ◽  
Model Catalyst ◽  
Average Pore ◽  
Diffusion Factor ◽  
Fcc Catalyst ◽  
Fcc Catalysts

Through the measured effective diffusion coefficients of Dagang vacuum residue supercritical fluid extraction and fractionation (SFEF) fractions in FCC catalysts and SiO2model catalysts, the relation between pore size of catalyst and effective diffusion coefficient was researched and the restricted diffusion factor was calculated. The restricted diffusion factor in FCC catalysts is less than 1 and it is 1~2 times larger in catalyst with polystyrene (PS) template than in conventional FCC catalyst without template, indicating that the diffusion of SFEF fractions in the two FCC catalysts is restricted by the pore. When the average molecular diameter is less than 1.8 nm, the diffusion of SFEF fractions in SiO2model catalyst which average pore diameter larger than 5.6 nm is unrestricted. The diffusion is restricted in the catalyst pores of less than 8 nm for SFEF fractions which diameter more than 1.8 nm. The tortuosity factor of SiO2model catalyst is obtained to be 2.87, within the range of empirical value. The effective diffusion coefficient of the SFEF fractions in SiO2model catalyst is two orders of magnitude larger than that in FCC catalyst with the same average pore diameter. This indicate that besides the ratio of molecular diameter to the pore diameter λ, the effective diffusion coefficient is also closely related to the pore structure of catalyst. Because SiO2model catalyst has uniform pore size, the diffusion coefficient can be precisely correlated with pore size of catalyst, so it is a good model material for catalyst internal diffusion investigation.

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