Pseudo-emulsion based hollow fiber with strip dispersion pertraction of iron(III) using (PJMTH+)2(SO42−) ionic liquid as carrier

Abstract

a b s t r a c tThe transport of iron(III) from acidic media using pseudo-emulsion based hollow fiber strip dispersion (PEHFSD) technology is investigated. As a carrier, (PJMTH + ) 2 (SO 4 2− ) ionic liquid, generated by direct reaction of the commercially available primary amine Primene JMT and sulphuric acid, is used. Several hydrodynamic conditions were investigated: concentration of iron (0.01-1 g l −1 ) and sulphuric acid concentration (10 −3 -0.5 M) in the feed phase, carrier concentration (1-30%, v/v) and sulphuric acid concentration (1-3 M) in the organic and strip solutions, of the pseudo-emulsion phase. The values encountered for the membrane and feed resistances, 112 and 1000 s/cm, showed that the contribution of the membrane resistance is negligible, whereas the feed resistance contributes around 17% to the overall resistance value (near 5800 s/cm), thus, the interfacial resistances due to the extraction and stripping reactions appeared dominant. The performance of the system is also compared against other ionic liquids generated from available amine extractants (Primene 81R, Primene TOA, Amberlite LA2 and tridodecylamine) and other hollow fiber configurations.

Membrane-based extraction with strip/organic dispersion methodologies for metals removal and recovery from wastewaters

“…The system is far to be highly selective for this metal in the presence of Co(II), Fe(III) and Cr(III) in the feed solution. By the reaction of the primary amine Primene JMT dissolved in n-decane and sulphuric acid as stripping solution, the ionic liquid (PJMTH + ) 2 (SO 4 2− ) was formed in situ in the pseudo-emulsion phase, and this ionic liquid was used as mobile carrier to investigate the transport of iron(III) using PEHFSD technology [40]. The organic solution also contained n-decanol to prevent the formation of the undesiderable third phase.…”

Studies on the extraction of Co(II) and Ni(II) from aqueous chloride solutions using Primene JMT-Cyanex272 ionic liquid extractant

“…These solvents are proving to be useful in the field of metal ion separations (Alguacil et al, 2010;Kogelinig et al, 2008;Papaiconomou et al, 2008). In the present investigations an ionic liquid HJMT + -Cy272 − is used in the cyclic aliphatic diluent D100 for the recovery and separation of Co(II) and Ni(II) from their chloride solutions.…”

“…In the present investigations an ionic liquid HJMT + -Cy272 − is used in the cyclic aliphatic diluent D100 for the recovery and separation of Co(II) and Ni(II) from their chloride solutions. Similar to the procedure reported by Alguacil et al (2010), ionic liquid extractant tertiary alkyl (C 16 -C 22 ) primary ammonium bis 2,4,4-(trimethylpentyl) phosphinate (HJMT + -Cy272 − ) is generated by reacting two commercially available extractants namely Primene®JMT (JMT) and Cyanex 272 (Cy272). Cy272 is reported to be a selective and efficient extractant for Co(II) (Flett, 2005) and also it is in use in many industries which are involved in base metal separations.…”

The removal of heavy metal cations from an aqueous solution using ionic liquids

“…The structure of AILs is mainly based on bulky organic cations such as imidazolium or pyridinium with long alkyl chain substituents and large variety of anions such as Cl À , Br À , BF 4 À , PF 6 À , N(CN) 2 À . [13] Pioneering works using ILs in conjunction with some crown ethers were focused on the extraction of metal ions belonging to groups 1 and 2 such as Na þ , Cs þ and Sr 2þ in aqueous phase, extending its use to the elimination of heavy metals. The key properties that distinguish PIL's from other IL's is the proton transfer from the acid to the base, leading to the presence of proton-donor and proton-acceptor, which can be used to build up a hydrogen-bonded network.…”