Results 1 to 10 of about 82 (54)
En el presente trabajo se ha estudiado la recuperación del vanadio contenido en soluciones procedentes del proceso de lixiviación de catalizadores agotados, por medio de la técnica de extracción con disolventes, empleando la amina primaria PRIMENE 81R ...
L. J. Lozano, J. García
doaj +6 more sources
Extracción de cromo con disolventes orgánicos. II parte. Extracción con TBP y con Primene 81R
Se estudia el empleo de un reactivo de carácter neutro (TBP) y otro de carácter básico (Primene 81R) para llevar a cabo la extracción del cromo presente en disoluciones acuosas.
D. de Juan, V. Meseguer, L. J. Lozano
doaj +5 more sources
La amina primaria Primene 81R extrae al ácido sulfúrico de los medios acuosos para formar las sales sulfato y bisulfato. El estudio IR muestra que en la sal sulfato, el grupo sulfato presenta una simetría Td, mientras que en la sal bisulfato este grupo ...
F. J. Alguacil
doaj +4 more sources
Extraction equilibrium between primary amine primene 81R and iron(III) sulphate
The extraction equilibrium between aqueous iron (III) sulphate solutions and amine Primene 81R was studied. The results show that the free amine extracts iron(III) from these solutions. The extracted complex has been isolated and can be represented by the stoichiometric formula 4RNH2·Fe2(SO4)3.
Alguacil, Francisco José, Amer, E
core +5 more sources
The extraction of iron(III) from aluminium sulphate solutions by the amine Primene 81R sulphate has been studied using 15 diluents of different types. The results are discussed in terms of the composition of the diluent and aggregation of the amine sulphate in solution, the dielectric constant and polar nature of the diluent, and interfacial tensions ...
Alguacil, Francisco José +2 more
core +4 more sources
Se estudia la aplicación del Primene 81R como agente de extracción del cromo presente en residuos sólidos que poseen níquel, hierro y cobre. El residuo se lixivió con disolución de ácido sulfúrico hasta pH 3 y se investigó la oxidación del Cr(III) a Cr ...
D. de Juan, V. Meseguer, L. J. Lozano
doaj +1 more source
Study of the amine primene 81R sulphate-Fe2(SO4)3 extraction equilibrium system at low temperatures
The extraction of iron(III) from aqueous sulphate solutions by Primene 81R sulphate at low temperatures was studied as a function of iron(III) and amine sulphate concentrations. In the range of temperatures between 8 and 5°C a complex with the stoichiometric formula 4(RNH3)2SO4·[Fe(OH)SO4]2 is extracted.
F.J. Alguacil, S. Amer
openaire +2 more sources
Extracción de Au(CN)2 mediante la amina primene 81R y mezclas sinérgicas de ésta con los derivados organofosforados neutros cyanex 923 y cyanex 921 [PDF]
La recuperación de oro de disoluciones cianuradas tradicionalmente se ha realizado mediante cementación, adsorción en carbón o cambio ionico. Sin embargo, la técnica de la extracción con disolventes no se ha empleado con la misma asiduidad en este campo, pese a las posibilidades que presenta para separar y concentrar el metal de interés. En la presente
openaire +1 more source
Some of the next articles are maybe not open access.
Solvent Extraction and Ion Exchange, 2001
Recovery of vanadium from a spent catlaysts leaching process has been studied using primary amine PRIMENE 81R, resulting in an industrial multistage process for the treatment of these effluents. An extraction mechanism for V(V) is proposed for this amine in acidic media, verifying the influence of pH on the process. Adequate ranges for the variables: O/
Luis J. Lozano, Diego Juan
openaire +1 more source
Recovery of vanadium from a spent catlaysts leaching process has been studied using primary amine PRIMENE 81R, resulting in an industrial multistage process for the treatment of these effluents. An extraction mechanism for V(V) is proposed for this amine in acidic media, verifying the influence of pH on the process. Adequate ranges for the variables: O/
Luis J. Lozano, Diego Juan
openaire +1 more source

