Separation of nitrophenols. Equilibriums in bi- and tri-phasic systems

Diaconu, Ioana; Aboul‐Enein, Hassan Y.; Al-Omar, Mohamed A.; Nechifor, Gheorghe; Ruse, Elena; Bunaciu, Andrei A.; Totu, Eugenia Eftimie

doi:10.1016/j.arabjc.2010.06.025

Cited by 23 publications

(17 citation statements)

References 17 publications

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“…c)The pertraction of the nitrophenol solution The synthetical solution of nitrophenol (from Sigma-Aldrich) having a concentration of 1-10 mg/L is introduced into a laboratory facility for pertraction ( fig. 5), that provides an effectively mass transfer surface of 1m 2 [33,34]. The synthetical liquid nitrophenol solutions in the feed are periodically analyzed (using a CAMSPEC spectrometer) [41-43].…”

Section: Methodsmentioning

confidence: 99%

“…The pertraction installation has a main body ( fig. 5) and reservoirs for the liquid solutions -which are recirculated using peristaltic pumps [27,34].…”

Section: Methodsmentioning

confidence: 99%

“…Although * email: tczszidonia@yahoo.com; aureliacristinanechifor@gmail.com apparently this method seems poor from technical and economical points of view, since the actual membranes are more elaborate and more expensive, the pertraction represents a membrane process that combines permeation through the membranes with the immobilization reaction of the component transported in a collector compartment ( fig. 1), for instance the neutralization reaction [34,35]. Thereby, the pertraction is a membrane technique in which a soluble component, e.g.…”

mentioning

confidence: 99%

“…The mass transfer through the membrane phase, during pertraction, as with other membrane processes, is based on the difference between the chemical potential of the dissolved substance in the two aqueous solutions. Thus, the flow intensity is controlled by the difference in concentration and/or chemical potential [34][35][36].…”

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confidence: 99%

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Iono-molecular Separation with Composite Membranes. VII. Nitrophenols pertraction on capilary polypropylene S-EPDM composite membranes

Nafliu¹,

Ani²,

Grosu³

et al. 2018

Mat.Plast.

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In the present paper the authors study the pertraction of the nitrophenols through the immobilization using chemical reaction in receiving phase, using a laboratory installation conceived by the Group of Membranes, Materials and Membrane Processes within University Politehnica of Bucharest. This installation was developed using liquid synthetically solutions, through composite membranes having a matrix of capillary polypropylene and inclusions of ethylene propylene diene terpolymer sulfonic acid (S-EPDM) or sulfonated ethylene-propylene-diene terpolymer (S-EPDM). The results were follow: The permeation through the compartments of the system with composite S-EPDM membranes is limited, in the aqueous phases, by the solubility of the compound about to be separated, namely the membrane itself, and subsequently by its diffusion from the feed compartment to the collection compartment. The chemical reaction of immobilization, in the receiving phase, can be achieved in several variants (neutralization, esterification, complexation, oxidation, coupling, oxidative degradation); The biggest flows are obtained in compensation of the o-nitrophenol with ferric ions and then, in acetylation of the o-nitrophenol with acetic anhydride. However, we can emphasize that the derivatization of the o-nitrophenol through complexation and acetylation reactions requires its use as such in later processes, unlike the neutralization, for which the nitrophenolate ion easily frees the nitrophenol for future applications;For the neutralization reaction, the removing coefficient grows with decreasing of pKa value of the nitrophenols. For complexation reaction, the most favorable results were obtained for o-nitrophenol - over 66%;The coupling reaction of the o-nitrophenol, in the receiving phase, with the diazonium chloride of the p-nitroaniline and hydrogen peroxide 3% in sulfuric acid 20%, respectively, concludes with the exhaustion of the source phase, after 24 hours of operation.

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Section: Methodsmentioning

confidence: 99%

“…The pertraction installation has a main body ( fig. 5) and reservoirs for the liquid solutions -which are recirculated using peristaltic pumps [27,34].…”

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Iono-molecular Separation with Composite Membranes. VII. Nitrophenols pertraction on capilary polypropylene S-EPDM composite membranes

Nafliu¹,

Ani²,

Grosu³

et al. 2018

Mat.Plast.

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“…Synthetic mono-mono-mono-nitrophenol solution (SigmaAldrich), with a concentration of 2000 ppm, is introduced into a laborator y facility for vacuum pervaporation (100 mmHg) or a controlled flow of nitrogen (5L/min), which ensures vaporization in the cell. Synthetic aqueous mono-mono-nitrophenols in the feed are periodically analyzed (CAMSPEC Spectrometer) [43][44][45].…”

Section: Pervaporation Of the Mono-mono-nitrophenol Solutionmentioning

confidence: 99%

Iono-molecular Separation with Composite Membranes IV. Mono-nitrophenol s pervaporation through polysulfone composite membranes

Ani¹,

Cimbru²,

Din³

et al. 2017

Mat.Plast.

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In this paper, were study the pervaporation of mono-nitrophenols in a laboratory installation of the Membrane, Materials, and Membrane Processes Group of the Polytechnic University of Bucharest, from aqueous synthetic solutions, to composite membranes with polysulfone matrix (PSf) and nanometric inclusions: Polyaniline (PANI), carbon nanotubes (CNT), magnetic nanoparticles (MNP) and sulfonated polyetheretherketone (PEEK-S). Tests carried out over 144 h at a pressure of 100 mm Hg or 5 L / min air flow at 25oC and pH 7 of the feed solution show that vacuum pervaporation is better than vacuum. The more advanced composite membranes are those with sulfonated polyether-ether cellulose (PSf-PEEK-S) and polyaniline (PSf-PANI) ionizers. The results of airborne pervaporation show that composite membranes (PSf-PEEK-S and PSf-PANI) present a marked difference in flux for the mono-mono-nitrophenol isomers, which could also be found in a technically exploitable selectivity. Thus, in the case of the PSf-PEEK-S composite membrane, the mono-nitro-phenol streams decrease in the order: m-C6H5NO3] o-C6H5NO3] p-C6H5NO3, while for the PSf-PANI composite membrane the order is o-C6H5NO3] m-C6H5NO3] p-C6H5NO3. At the same time, it is noted that the PSf-PEEK-S composite membrane performance is superior during operation, but shows the opposite of the more pronounced drop.

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