High-efficient synergistic extraction of Co(II) and Mn(II) from wastewater via novel microemulsion and annular centrifugal extractor

Yang, Xiaoyang; Jie, Fengping; Wang, Bingjie; Bai, Zhishan

doi:10.1016/j.seppur.2018.09.057

Cited by 21 publications

(5 citation statements)

References 54 publications

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“…Microemulsion is a transparent, isotropic, and thermodynamically stable system with nanosized droplets (<100 nm) that are dispersed in a continuous phase and stabilized by surfactant molecules at the aqueous–organic interface. − The use of ILs as surfactants for constructing microemulsion would be a good choice for metal ion extraction in terms of low viscosity and high selectivity. Many pioneering studies have already demonstrated the advantages of microemulsion for the metal ion extraction, which allow for high extraction efficiency, low cost, and simple operation compared to traditional liquid–liquid extraction processes. − In particular, the use of the microemulsion-based extraction systems can reduce the loss of the hydrophilic ILs and facilitate recycling extractants and separating target products rapidly. However, the stripping process to get the target metal ions from the microemulsion through the reductive method that is most frequently used cannot ensure the reusability of the microemulsion. , In addition, traditional extraction processes often require strong mechanical stirring for obtaining large specific interfacial area and fast mass transfer.…”

Section: Introductionmentioning

confidence: 54%

Continuous Extraction of Gold(III) Using Pyridine Ionic Liquid-Based Water-in-Oil Microemulsion in Microreactors

Zhang

Shang

Shen

et al. 2019

Ind. Eng. Chem. Res.

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Hydrophilic hexadecylpyridinium chloride ionic liquid constructed water-in-oil microemulsion was applied for the continuous extraction of gold(III) in a microreactor system. The anion exchange extraction mechanism was proven by spectroscopic techniques. In this extraction system, the remarkable extraction ability for gold(III) with the extraction percentage of 99.2% at the residence time of 14.7 s, and high selectivities for gold(III) over Ni(II), Fe(III), Cu(II), and Al(III) were achieved. Moreover, a higher flow rate and a smaller inner diameter of the capillary were beneficial for the gold(III) extraction, and the overall volumetric mass transfer coefficient (0.33–2.9 s–1) was higher than other metal ion extraction systems in microreactors, or the same extraction system in a batch reactor (0.007 to 0.103 s–1). Furthermore, the microemulsion recycling was realized, indicating such a study extends the applications of hydrophilic ionic liquids and microreactor technology on noble metal extraction.

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Section: Introductionmentioning

confidence: 54%

Continuous Extraction of Gold(III) Using Pyridine Ionic Liquid-Based Water-in-Oil Microemulsion in Microreactors

Zhang

Shang

Shen

et al. 2019

Ind. Eng. Chem. Res.

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“…For instance, the removal of acetic acid from wastewater streams via reactive extraction was studied using CINC V 02 centrifuge [129], whereas INET [130] and QY-165 [60] devices were applied to extract phenol from alike streams. Also using ACCs, Co 2+ and Mn 2+ ions isolation [131] and caprolactam extraction [132] from aqueous effluents were investigated, yet it is not clear which specific ACC types were implemented. The separation of americium (Am) from lanthanides is challenging due to the subtle differences in properties.…”

Section: Extraction Of P-cresol [128]mentioning

confidence: 99%

Liquid‐Liquid Centrifugal Extractors: Types and Recent Applications – a Review

Hamamah

Grützner

2022

ChemBioEng Reviews

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In light of the elevating pressures toward adopting intensifying technologies, centrifugal extractors are increasingly drawing attention as a promising alternative to traditional extraction equipment. Recently, many fields have applied them in research and that resulted in a considerable amount of information that may be hard to follow. To keep interested researchers updated, this work presents the state‐of‐the‐art status of those devices. That is, the different types of centrifugal extractors are first surveyed with emphasis on those available on the market nowadays. Then, their recent applications are covered with exclusion of two fields: oil‐water separations and nuclear industry, as the purpose is to accent centrifugal extractors' potential and compatibility with the widest possible range of applications beyond traditional ones. A further section addresses the hydrodynamics of annular centrifugal contactors that form a major subfamily of centrifugal extractors. Those annular variants have received special focus throughout this work, since not only are they the most encountered devices in literature but also still to date under development with latest versions being 3D‐printed.

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“…A typical structure of the working module is shown in Figure , which plays a key role in the extraction and separation performance. The ACC has many advantages such as small hold-up volume, low residence time, good phase separation performance, and high mass transfer efficiency. − ACC have been widely used in many fields including chemical industries, − wastewater treatment, − biological engineering, and high-level liquid waste partitioning. ,− Also, ACC hold great promise for rapid demulsification and fast deoxygenation. , …”

Section: Introductionmentioning

confidence: 99%

Effects of the Structure, Operation, and Physical Parameters on the Actual Phase Ratio and Interface Radius in the Separation Zone of an Annular Centrifugal Contactor

Miao

Sun

Zheng

et al. 2022

Ind. Eng. Chem. Res.

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The annular centrifugal contactor (ACC) is highly efficient solvent extraction equipment and has been successfully used in many industrial fields. The phase distribution of two phases in the separation zone of the rotor is an important factor affecting the hydraulic performance of the ACC. It can be characterized by the actual phase ratio (R o/a ) and interface radius (r i ). So far, there have been few systematic research studies on the effects of the structure, operation, and physical parameters on them. This work systematically investigated the effects of the structure [the radius of the heavy phase weir (r a *) and radius of the light phase weir (r o *)], operation [rotor speed (N), flow ratio (F o/a ), and total flow (Q)], and physical parameters [density difference (ρ a − ρ o ), viscosity ratio (μ o /μ a ), and interfacial tension (γ/γ*, γ* is the constant interfacial tension)] on the hold-up volume, R o/a , and r i in the 20 mm ACC using a liquid fast separating method. The results show that R o/a and r i increased with the increase of N, F o/a , and r a * and decreased with the increase of r o *, Q, and ρ a − ρ o . However, μ o /μ a and γ/γ* have little effect on R o/a and r i .The N can reach more than 5000 rpm when the ρ a − ρ o is greater than 0.2200 g/cm 3 . The closer the R o/a is to 0.45, the better the hydrodynamic properties of the extracted system are in the ACC. A new model associated with these parameters was established to calculate r i . The results show that the ρ a − ρ o of the extraction system is the main factor affecting the r i with a degree of influence of 0.5654, followed by the combination of different-size phase weirs with a degree of influence of 0.4052. Moreover, the r i values obtained by the model are in good agreement with those obtained by experiments. The experimental results will provide relevant references for the improvement and optimization of the ACC.

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High-efficient synergistic extraction of Co(II) and Mn(II) from wastewater via novel microemulsion and annular centrifugal extractor

Cited by 21 publications

References 54 publications

Continuous Extraction of Gold(III) Using Pyridine Ionic Liquid-Based Water-in-Oil Microemulsion in Microreactors

Continuous Extraction of Gold(III) Using Pyridine Ionic Liquid-Based Water-in-Oil Microemulsion in Microreactors

Liquid‐Liquid Centrifugal Extractors: Types and Recent Applications – a Review

Effects of the Structure, Operation, and Physical Parameters on the Actual Phase Ratio and Interface Radius in the Separation Zone of an Annular Centrifugal Contactor

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