Prediction of enhancement factor for mass transfer coefficient in regular packed liquid-liquid extraction columns

2010 ◽  
Vol 89 (3) ◽  
pp. 508-519 ◽  
Author(s):  
Ahmad Rahbar ◽  
Zoha Azizi ◽  
Hossein Bahmanyar ◽  
Mohammad Ali Moosavian
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Enhancement Factor ◽  
Liquid Extraction ◽  
Liquid Liquid Extraction

Experimental Investigation of the Effects of Surfactants on the Mass Transfer in Liquid-Liquid Extraction Equipments

2007 ◽  
Author(s):  
A. Haghdoost ◽  
M. Shah-Alami ◽  
H. Mansouri
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Terminal Velocity ◽  
Liquid Extraction ◽  
Drop Diameter ◽  
Transfer Resistance ◽  
Transfer Rates ◽  
Liquid Liquid Extraction ◽  
Triton X

Mass transfer rates to the drops in liquid-liquid extraction equipment are often likely to be reduced by the presence of surface active contaminants. This reduction in mass transfer is said to be due to a reduction in terminal velocity, and to changes in pattern of internal circulation. A single-drop extraction apparatus was used to investigate the dependency of mass transfer coefficient on the amount of surfactant added in a system of n-butanol/succinic acid/water. Three types of surfactants, SDS, DTMAC and Triton X-100, were used to study their effects on the inhibition of mass transfer in liquid-liquid extraction. The effect of surfactants concentration on extraction percentage, overall mass transfer coefficient, and extra mass transfer resistance was investigated for these surfactants. Also variation of terminal velocity as a function of surfactant concentration and drop diameter were illustrated for both surfactants. Finally these surfactants were compared to each other.

scholarly journals KEBERLAKUAN MODEL HB-GFT SISTEM n-HEKSANA – MEK – AIR PADA EKSTRAKSI CAIR-CAIR KOLOM ISIAN

Konversi ◽  
2013 ◽  
Vol 2 (1) ◽  
pp. 32
Author(s):  
Agus Mirwan
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Flow Rate ◽  
Liquid Extraction ◽  
Extraction Column ◽  
Drop Diameter ◽  
Dispersion Phase ◽  
Liquid Liquid Extraction ◽  
Packing Column

Ekstraksi cair-cair dalam kolom isian merupakan proses pemisahan fasa cair yang memanfaatkan perbedaan kelarutan suatu zat. Tipe ekstraksi ini termasuk kedalam  tipe ekstraksi kolom vertikal tanpa berpengaduk (unagitated) selain kolom semprot (spray) dan kolom pelat. Operasi ekstraksi cair-cair yang baik sangat dipengaruhi oleh karakteristik perpindahan zat terlarut (solute). Karakteristik ini dapat dikuantifikasikan dengan suatu nilai yang disebut dengan koefisien perpindahan massa. Koefisien perpindahan massa ini sangat penting untuk diketahui dalam perancangan kolom ekstraksi cair-cair dan nilainya dapat dicari dengan menggunakan model-model estimasi koefisien perpindahan massa baik di fasa dispersi maupun fasa kontinyu. Penelitian ini bertujuan untuk membuktikan keberlakuan model Handloss-Baros – Garner-Foord-Tayeban (HB-GFT) pada proses ekstraksi cair-cair menggunakan prototipe kolom transparan dan jenis isian berupa bola-bola kecil dengan variasi laju alir fasa kontinyu dan fasa dispersi pada rentang tetesan bersirkulasi (Re = 10 – 200). Dari penelitian ini didapatkan bahwa jenis isian, ukuran tetesan, dan laju alir fasa kedua (dispersi dan  kontinyu) memberikan pengaruh yang cukup signifikan terhadap proses perpindahan massa yang dinyatakan dengan koefisien perpindahan massa keseluruhan (KOD). Data laju alir dan komposisi masing-masing fasa di aliran masuk dan keluar kolom dianalisis dengan menggunakan alat kromatografi gas (GC) yang ditunjukan dengan makin besar laju alir fasa dispersi (Qd), koefisien perpindahan massa keseluruhan (KOD) makin kecil. Hal ini disebabkan bahwa ukuran diameter tetesan disepanjang kolom isian dianggap sama. Dan keberlakuan model HB-GFT untuk dinamika tetesan sirkulasi internal (170<Re<200) merupakan kombinasi terbaik dalam penentuan KOD dengan standar deviasi sebesar 3,2%. Keywords: ekstraksi, kolom isian, perpindahan massa. Liquid-liquid extraction in packed column is a process of liquid phase separation in which a liquid solution (the feed) is contacted with an immiscible or nearly immiscible liquid (solvent). This type of extraction is a kind of vertical column extraction type without agitator (unagitated column) besides spray column and plate column. Good operation of liquid-liquid extraction hardly influenced by solute transfer characteristic. This characteristic can be quantification with a value so-called with mass transfer coefficient. Mass transfer coefficient is importance in order to be known in scheme of liquid-liquid extraction column and the values can be searched by using estimation models of mass transfer coefficient either in dispersion phase and also continue phase.The aim of this research is to prove model applying Handloss-Baros - Garner-Foord-Tayeban (HB-GFT) at liquid-liquid extraction process using transparent column prototype and packing type of small sphere with various of flow rate continue phase and dispersion phase at circulation drop spread (Re = 10 - 200). From this research got that packing type, droplet size, and flow rate phase (dispersion and continue) gives influence that is enough significant to mass transfer process that expressed with overall mass transfer coefficient (KOD). Flow rate and composition each phase in inlet and outlet column data are analyzed by using gas chromatography equipment (GC) that showed more and more big dispersion phase (Qd) flow rate, mass transfer coefficient (KOD) more and more small. This caused that drop diameter measure along the length of packing column assumed to be same. And model applying HB-GFT for internal circulation drop dynamics (170<Re<200) is best combination in determination of KOD with deviation standard equal to 3,2%. Keywords: extraction, packing column, mass transfer

scholarly journals Enhancement of Solubility and Mass Transfer Coefficient of Benzoic Acid Through Hydrotropy

2013 ◽  
Vol 15 (1) ◽  
pp. 46-50 ◽  
Author(s):  
D. Gnana Prakash ◽  
S. Thenesh Kumar ◽  
N. Nagendra Gandhi
Keyword(s):  
Mass Transfer ◽  
Benzoic Acid ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Enhancement Factor ◽  
Sodium Salicylate ◽  
Maximum Enhancement ◽  
Wide Range ◽  
System Temperature ◽  
Solubility Studies

The effect of hydrotropes such as sodium salicylate, sodium benzoate, and nicotinamide on the solubility and mass transfer coefficient of benzoic acid has been investigated. The solubility studies were carried out under a wide range of hydrotrope concentrations (0 to 3.0 mol/L) and different system temperatures (303K to 333K). It has been observed that the solubility and mass transfer coefficient of benzoic acid increases with an increase in hydrotrope concentration and also with system temperature. A Minimum Hydrotrope Concentration (MHC) was found essential to initiate a significant increase in the solubility and the mass transfer coefficient. The maximum enhancement factor (φs), which is the ratio of the solubility value in the presence and absence of a hydrotrope, has been determined for all sets of experimentations. The solubility of benzoic acid has been enhanced to 19.98 times in the presence of 2.5 mol/L concentration of sodium salicylate hydrotrope at 333K.The effectiveness of hydrotropes was measured in terms of Setschenow constant Ks and the highest value has been observed as 0.502 for sodium salicylate.

scholarly journals The effect of hydrotropes on the solubility and mass transfer coefficient of 2-nitrobenzoic acid

2009 ◽  
Vol 11 (2) ◽  
pp. 55-59 ◽  
Author(s):  
S. Thenesh-Kumar ◽  
D. Gnana-Prakash ◽  
N. Nagendra-Gandhi
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Enhancement Factor ◽  
Sodium Acetate ◽  
Comprehensive Investigation ◽  
Maximum Enhancement ◽  
Nitrobenzoic Acid ◽  
Wide Range ◽  
System Temperature

The effect of hydrotropes on the solubility and mass transfer coefficient of 2-nitrobenzoic acid A comprehensive investigation on the solubility and mass transfer coefficient enhancement of 2-nitrobenzoic acid through hydrotropy, has been undertaken. The solubility and mass transfer coefficient studies were carried out using hydrotropes such as sodium acetate, citric acid and nicotinamide under a wide range of hydrotrope concentrations (0 to 3.0 mol/L) and different system temperatures (303 to 333 K). It was found that the solubility and mass transfer coefficient of 2-nitrobenzoic acid increases with an increase in hydrotrope concentration and also with system temperature. All hydrotropes used in this work showed an enhancement in the solubility and mass transfer coefficient to different degrees. The maximum enhancement factor value has been determined for both the solubility and mass transfer coefficient. The effectiveness of hydrotropes was measured in terms of Setschnew constant Ks and reported for all the hydrotropes used in this study.

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