scholarly journals Lanthanum Oxide Obtention from Different Spent Fluid Catalytic Cracking Catalysts

Author(s):  
Lorena Alcaraz ◽  
Olga Rodríguez Largo ◽  
Francisco J. Alguacil ◽  
Margarita Alvarez Montes ◽  
Carmen Baudín ◽  
...  

An laboratory procedure has been developed to obtain lanthanum oxide from spent fluid catalytic cracking catalyst, commonly used in the cracking the heavy crude oil process. Two different spent fluid catalytic cracking catalysts, which are mainly formed by silica and alumina, and a certain amount of rare earths were leached under several conditions to recover the rare earth from the solids waste. Subsequently, liquid phases were subjected to a liquid-liquid extraction process, and lanthanum was quantitatively stripped using oxalic acid to obtain the corresponding lanthanum oxalates. After the corresponding thermal treatment, these solids were transformed into lanthanum oxide. Both, lanthanum oxalates and oxides solids have been characterized by wide techniques in order to investigate the purity of the phases.

Nukleonika ◽  
2015 ◽  
Vol 60 (4) ◽  
pp. 821-827 ◽  
Author(s):  
Lukasz Steczek ◽  
Jerzy Narbutt ◽  
Marie-Christine Charbonnel ◽  
Philippe Moisy

Abstract Complex formation between uranyl ion, UO22+, and a hydrophilic anionic form of SO3-Ph-BTP4- ligand, L4-, in water was studied by liquid-liquid extraction experiments performed over a range of the ligand and HNO3 concentrations in the aqueous phase, at a constant concentration of nitrate anions at 25°C . The competition for UO22+ ions between the lipophilic TODGA extractant and the hydrophilic L4- ligand leads to the decrease in the uranyl distribution ratios, D, with an increasing L4- concentration. The model of the solvent extraction process used accounts - apart from uranyl complexation by TODGA and SO3-Ph-BTP4- - also for uranyl complexation by nitrates and for the decrease in the concentration of the free L4- ligand in the aqueous phase, due to its protonation, bonding in the uranyl complex and the distribution between the two liquid phases. The unusually strong dependence of the D values on the acidity, found in the experiment, could hardly be explained as due to L4- protonation merely. Three hypotheses were experimentally tested, striving to interpret the data in terms of additional extraction to the organic phase of ion associates of protonated TODGA cation with either partly protonated anionic L4- ligands or anionic UO22+ complexes with NO3 - or L4-. None of them has been confirmed. The analysis of the results, based on the formal correction of free ligand concentrations, points to the formation of 1 : 1 and 1 : 2 uranyl - SO3-Ph-BTP complexes in the aqueous phase. The conditional formation constant of the 1:1 complex has been determined, logßL,1 = 2.95 ± 0.15.


2005 ◽  
Vol 17 (9) ◽  
pp. 2466-2474 ◽  
Author(s):  
P. Kortunov ◽  
S. Vasenkov ◽  
J. Kärger ◽  
M. Fé Elía ◽  
M. Perez ◽  
...  

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 654 ◽  
Author(s):  
Moussa Toure ◽  
Guilhem Arrachart ◽  
Jean Duhamet ◽  
Stephane Pellet-Rostaing

A study has been carried out on Ta and Nb recovery by a liquid-liquid extraction process using 4-methylacetophenone (4-MAcPh) as the organic phase. The 4-MAcPh was compared to methyl isobutyl ketone (MIBK) with respect to extraction efficiencies (D values) at different concentrations of H2SO4 in the aqueous phase. The results showed a similar extraction of Nb for both solvents. However, for Ta, extraction efficiency is increased by a factor of 1.3 for 4-MAcPh. In addition, the MIBK solubilized completely after 6 mol∙L−1 of H2SO4 against only a loss of 0.14–4% for 4-MAcPh between 6 and 9 mol∙L−1 of H2SO4. The potential of 4-MAcPh has also been studied to selectively recover Ta from a model capacitor waste solution. The results showed a selectivity for Ta in the presence of impurities such as Ag, Fe, Ni and Mn. The 4-MAcPh also presents the advantage of having physicochemical properties adapted to its use in liquid-liquid extraction technologies such as mixer-settlers.


2013 ◽  
Vol 15 (3) ◽  
pp. 81-84 ◽  
Author(s):  
Indrasing D. Patil ◽  
Yogita S. Patil ◽  
Bhausaheb L. Pangarkar

Abstract Pesticide pollution is a serious problem being faced. Harmful levels of pesticides are found in the water which is used for daily purposes. In the event of such a scenario, this paper presents a working solution for bringing down the Pesticide levels in the water to safe levels by using the method of liquid-liquid extraction. The experimental liquid-liquid equilibrium data on pesticide-water-solvent ternary mixtures at a temperature of 288.15 K are presented here. The pesticide used here is a chlorinated hydrocarbon called lindane found in the water (underground, land), beverages and foods. The solvents used are Petro-ether-Chloroform (1:1), Ethylene di chloride and n-hexane. The equilibrium generation diagram, triangular diagram, tie lines and bimodal curves as well as the distribution coefficient have been determined and reported. The petro-ether-chloroform was found to be the right solvent for the separation of lindane from wastewater because of high selectivity (25.36) and distribution coefficient (4). The extraction process is simulated into ‘C’ language


2005 ◽  
Vol 70 (6) ◽  
pp. 853-867 ◽  
Author(s):  
T.N. Shilmkar ◽  
S.S. Kolekar ◽  
M.A. Anuse

The distribution equilibrium of gallium(III) between n-octylaniline dissolved in toluene and acidic aqueous succinate media has been investigated as a function of the concentration of extractant in the organic phase and concentration of hydrogen ions and gallium( III) ions in the aqueous phase. The stoichiometry of the extracted species was determined on the basis of slope analysis.Gallium(III) is extracted by the anion exchange mechanism as [RNH3+Ga(succinate)2]org. The temperature dependence of the extraction equilibria was examined by the temperature variation method. The extraction process is favoured with increasing temperature. It was found that a large number of cations and anions have a high tolerance limit. The selectivity of the extraction is increased by the use of suitable masking agents. The method affords the binary separation of gallium(III) from associated elements and was further extended to the analysis of a synthetic mixture.


Author(s):  
Vania Regina Gabbi Polli ◽  
Alnei Ramos Prochnow ◽  
Juliane Zimmernan Tamanini

Liquid-liquid extraction of pigments present in mate (flex Paraguariensis) was studied using various organic solvents and different concentrations. The best results were obtained using diethyl ether and sodium lauryl sulfate. The effect of the addition of ethanol on the extraction process was also analyzed.


OPE Journal ◽  
2021 ◽  
Vol 11 (37) ◽  
pp. 20-20

The experts at Seqens are working on the implementation of a continuous liquid-liquid extraction process. In OPE journal, the company provides an update on the development


2017 ◽  
Vol 53 (28) ◽  
pp. 3933-3936 ◽  
Author(s):  
Deni Mance ◽  
Johan van der Zwan ◽  
Marjolein E. Z. Velthoen ◽  
Florian Meirer ◽  
Bert M. Weckhuysen ◽  
...  

Solid-state NMR techniques supported by EPR and SEM-EDX enable spatial speciation of carbon deposits in commercial fluid catalytic cracking catalysts.


1998 ◽  
Vol 176 (2) ◽  
pp. 387-394 ◽  
Author(s):  
D.A. Jacobs ◽  
G.C. Smith ◽  
R.D. Vis ◽  
A.F.H. Wielers

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