Salting-out phase separation of the mixture of 2-propanol and water for selective extraction of cobalt(II) in the presence of manganese(II), nickel(II), and copper(II)

Chung, Nguyen Huu; Tabata, Masaaki

doi:10.1016/j.hydromet.2003.08.003

Cited by 17 publications

(16 citation statements)

References 28 publications

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“…Organophosphorous compounds are widely used [25][26][27] for treating effluents and leachates, especially in sulphuric acid medium. Extraction of molybdenum [28,29] with amines and organophosphorous compounds is possible in low pH (normally 1-2).…”

Section: Introductionmentioning

confidence: 99%

Hydrometallurgical route to recover molybdenum, nickel, cobalt and aluminum from spent hydrotreating catalysts in sulphuric acid medium

Valverde

Paulino

Afonso

2008

Journal of Hazardous Materials

109

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Section: Introductionmentioning

confidence: 99%

Hydrometallurgical route to recover molybdenum, nickel, cobalt and aluminum from spent hydrotreating catalysts in sulphuric acid medium

Valverde

Paulino

Afonso

2008

Journal of Hazardous Materials

109

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“…Such tendency is in good agreement with the results of cobalt(II) extraction: the extraction efficiency increases with increasing CaCl2 concentrations. 1 Looking at Table 1, one can notice that the mole fraction of water in the organic phases increases with an increase of CaCl2, in the aqueous phases. Thus, the overall extraction efficiency increased with increasing the initial concentration of CaCl2, as we have described above.…”

Section: Mechanism Of the Extraction Of Cobalt(ii) In A Mixture Of 2-mentioning

confidence: 95%

“…1 Equal volumes (5 cm 3 ) of 2-propanol and an aqueous solution containing Co(II) and CaCl2 were taken in a centrifuge tube and mixed well and shaken vigorously. The solution was separated into two phases after being left for 5 min, and then cobalt(II) chloro complexes were extracted into the organic phase.…”

Section: Mechanism Of the Extraction Of Cobalt(ii) In A Mixture Of 2-mentioning

confidence: 99%

“…In our previous paper, 1 we reported on the quantitative extraction of cobalt(II) in the presence of manganese(II), nickel(II) and copper(II) by a salting-out method from 2-propanol-water mixed solvents using CaCl2 as a salting-out agent. We have pointed out that the conversion of Co 2+ to [CoCl4] 2-in the salted-out aqueous phase is crucial for the extraction of cobalt(II) in the presence of a large amount of CaCl2.…”

Section: Introductionmentioning

confidence: 99%

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Spectrophotometric Titration of Cobalt(II) with CaCl2 in Mixed Solvents of 2-Propanol and Water for the Analysis of the Extraction Mechanism of Cobalt(II) by Salting-out in the Presence of CaCl2

Chung

Tabata

2005

ANAL. SCI.

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“…Extratantes do tipo organofosforados são grandemente utilizados para esse fim, 25 sendo de aplicação industrial corrente 26,27 31 Assim, a recuperação do molibdênio por extração com solvente dependerá da presença ou não de fósforo, silício, etc. e das adaptações necessárias dos parâmetros operacionais do processo (especialmente a concentração do ácido na etapa de abertura).…”

Section: Introductionunclassified

Rota hidrometalúrgica de recuperação de molibdênio, cobalto, níquel e alumínio de catalisadores gastos de hidrotratamento em meio ácido

Júnior¹,

Paulino²,

Afonso³

2008

Quím. Nova

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Recebido em 23/3/07; aceito em 17/8/07; publicado na web em 10/3/08 HYDROMETALLURGICAL ROUTE TO RECOVER MOLYBDENUM, NICKEL, COBALT AND ALUMINUM FROM SPENT HYDROTREATING CATALYSTS IN ACID MEDIUM: This work describes a hydrometallurgical route for processing spent commercial catalysts (CoMo and NiMo/Al 2 O 3 ). Samples were preoxidized (500 o C, 5 h) in order to eliminate coke and other volatile species present. The calcined solid was dissolved in concentrated H 2 SO 4 and water (1:1 vol/vol) at 90 ºC; the insoluble matter was separated from the solution. Molybdenum was recovered by solvent extraction using tertiary amines at pH around 1.8. Cobalt (or nickel) was separated by addition of aqueous ammonium oxalate at the above pH. Phosphorus was removed by passing the liquid through a strong anion exchange column. Aluminum was recovered by neutralizing the solution with NaOH. The route presented in this work generates less final aqueous wastes because it is not necessary to use alkaline medium during the metal recovery steps.Keywords: spent catalysts; metal recovery; waste management. INTRODUÇÃOHidrotratamento (HDT) é um termo que engloba uma variedade de processos de hidrogenação catalítica, os quais saturam hidrocarbonetos olefínicos e aromáticos, promovem a remoção de heteroátomos (como enxofre, nitrogênio e oxigênio) e, ainda, metais presentes na matéria-prima a ser processada. Estes processos representam algumas das mais importantes aplicações da catálise. 1 O HDT é empregado tanto no processamento de cargas brutas pesadas (por exemplo, os petróleos venezuelanos ou os da bacia de Campos), quanto para melhorar a qualidade dos produtos finais e tem, ainda, papel essencial em correntes pré-tratadas para outros processos de refinaria, tais como reforma catalítica e craqueamento catalítico em leito fluidizado (FCC). Por isso, o HDT possui hoje uma importância capital nesse segmento da indústria de petróleo. Ele precisa ser versátil o bastante para poder aceitar cargas dos mais variados tipos e qualidades, e com isso a refinaria pode manter a oferta e o abastecimento dos derivados sem grandes perturbações temporais, ao mesmo tempo em que reduz a dependência do fornecimento da matéria-prima.Atualmente, as legislações sobre o meio ambiente impõem restrições severas e crescentes sobre as emissões de partículas e gases, vindos tanto das refinarias quanto do uso de combustíveis em veícu-los automotores e máquinas. Essas regulamentações exigem a necessidade de melhorar a qualidade do refino de petróleo (maior eficiência de remoção de contaminantes). A remoção de enxofrecomumente referida sob o nome de hidrodessulfurização (HDS) -é uma reação dentro do HDT que se tornará cada vez mais importante a fim de garantir combustíveis mais aceitáveis para o meio ambiente, 2 de acordo com o teor máximo de enxofre permitido nesses produtos: 10 ppm no diesel a partir de 2008 na Europa; 3,4 15 ppm no diesel desde 2006 nos EUA. 4 No Brasil, a meta é atingir 50 ppm. 5 Os catalisadores de HDT mais familiares são os CoMo, NiMo e NiW, suport...

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Salting-out phase separation of the mixture of 2-propanol and water for selective extraction of cobalt(II) in the presence of manganese(II), nickel(II), and copper(II)

Cited by 17 publications

References 28 publications

Hydrometallurgical route to recover molybdenum, nickel, cobalt and aluminum from spent hydrotreating catalysts in sulphuric acid medium

Hydrometallurgical route to recover molybdenum, nickel, cobalt and aluminum from spent hydrotreating catalysts in sulphuric acid medium

Spectrophotometric Titration of Cobalt(II) with CaCl2 in Mixed Solvents of 2-Propanol and Water for the Analysis of the Extraction Mechanism of Cobalt(II) by Salting-out in the Presence of CaCl2

Rota hidrometalúrgica de recuperação de molibdênio, cobalto, níquel e alumínio de catalisadores gastos de hidrotratamento em meio ácido

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