Extraction and stripping behavior of hydrochloric acid from aqueous solution by Cyanex 923/TEHA and its mixtures

Le, Minh Nhan; Nguyen, Thi Hong; Lee, Man Seung

doi:10.1080/12269328.2018.1493956

Cited by 3 publications

(3 citation statements)

References 21 publications

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“…HNO 3 and HCl are widely used in nuclear, chemical, and hydrometallurgy industries as essential mineral acids, resulting in the production of a large amount of acidic waste solution and causing serious environmental problems. − Technologies including membrane distillation, diffusion dialysis, ion exchange, membrane separation, solvent extraction, etc. have been developed to separate and recover valuable acids in acidic waste solution. − …”

Section: Introductionmentioning

confidence: 99%

Selective Separation of HNO₃ and HCl by Extraction: The Investigation on the Noncovalent Interaction between Extractants and Acids by Density Functional Theory

Sun

Yao

et al. 2021

J. Phys. Chem. B

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There is a huge demand for the highly selective separation of HNO3 and HCl in many industries, and solvent extraction is considered a feasible method. In this article, DFT calculations were performed to investigate the interactions between acids and extractants including alcohols, ketones, phosphorus, and amines. One of the significant findings to emerge from this study is that amines bind to acids through ion association. Nevertheless, the interaction between acids and alcohols, ketones, and phosphorus with a (RO)3PO structure is mainly dominated by hydrogen bonds. The change of Gibbs free energy in the extraction process shows that the phosphorus ((RO)3PO) is superior to other types of extractants in the selective separation of HNO3 and HCl. Furthermore, after the alkoxyl group (RO−) in phosphorus ((RO)3PO) is replaced by RN– or R– with less electronegativity, the interaction between HCl and the substituted extractants transitions from a hydrogen bond to ion association, but there are still strong hydrogen bonds between them and HNO3. That will lead to a decrease in the selectivity of phosphorus due to the change in interaction types. This new understanding should help the design and screening of efficient extractants for the separation of mineral acids.

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Section: Introductionmentioning

confidence: 99%

Selective Separation of HNO₃ and HCl by Extraction: The Investigation on the Noncovalent Interaction between Extractants and Acids by Density Functional Theory

Sun

Yao

et al. 2021

J. Phys. Chem. B

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“…Among them, TEHA has the best performance for extraction but stripping percentage of HCl from the loaded organic phase was low, resulting in low concentration of HCl in the recovered acid 6,10) . The HCl from the loaded TEHA could be completely stripped by 2 M ammonia solution 11) . However, it seems to be an infeasible solution in industry due to the complication of stripping liquor and the difficulty in regeneration of HCl.…”

Section: Introductionmentioning

confidence: 99%

“…The solvent extraction of inorganic acids from spent leaching solutions can be beneficial on the light of environment and process economics but most of the works have been done from weak acidic solutions 12) . In order to overcome some disadvantages of employing single TEHA, the influence of adding neutral extractants such as Cyanex 921 (trioctylphosphine oxide), DOS (din-octyl sulfide), MIBK (methyl isobutyl ketone), TBP (tributyl phosphate), and TOP (tri octyl phosphate) to TEHA has been investigated on the extraction of HCl 11) .…”

Section: Introductionmentioning

confidence: 99%

Solvent Extraction of Hydrochloric Acid Using Commercial Extractants and Synthesized Ionic Liquids

Lee¹

2020

J. of Korean Inst. of Resources Recycling

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The extraction and stripping of HCl from aqueous solutions by commercial extractants like LIX 63 and its mixture with TEHA/ Cyanex 923/ Aliquat 336 and ionic liquids like ALi-SCN, ALi-PC in kerosene was investigated. Among these extractants, ALi-PC showed the best extraction effectivity (above 80%), but it was difficult to strip HCl from the loaded phase. Although the extraction percentage of HCl by LIX 63 was not high, the stripping performance was above 81%. The addition of octanol to the organic phase led to negative effect on the extraction performance of HCl. The addition of C 2 H 5 OH into aqueous solutions significantly increased the extraction and stripping percentage of HCl by LIX 63, ALi-PC and ALi-SCN.

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Scale-Up of Membrane-Based Zinc Recovery from Spent Pickling Acids of Hot-Dip Galvanizing

et al. 2020

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Zinc recovery from spent pickling acids (SPAs) can play an important role in achieving a circular economy in the galvanizing industry. This work evaluates the scale-up of membrane-based solvent extraction technology aimed at the selective separation of zinc from industrial SPAs as a purification step prior to zinc electrowinning (EW). The experiments were carried out at a pilot scale treating SPAs batches of 57 to 91 L in a non-dispersive solvent extraction (NDSX) configuration that simultaneously performed the extraction and backextraction steps. The pilot plant was equipped with four hollow fiber contactors and 80 m2 of total membrane area, which was approximately 30 times higher than previous bench-scale studies. Tributylphosphate diluted in Shellsol D70 and tap water were used as organic and stripping agents, respectively. Starting with SPAs with high Zn (71.7 ± 4.3 g·L−1) and Fe (82.9 ± 5.0 g·L−1) content, the NDSX process achieved a stripping phase with 55.7 g Zn·L−1 and only 3.2 g Fe·L−1. Other minor metals were not transferred, providing the purified zinc stripping with better quality for the next EW step. A series of five consecutive pilot-scale experiments showed the reproducibility of results, which is an indicator of the stability of the organic extractant and its adequate regeneration in the NDSX operation. Zinc mass transfer fluxes were successfully correlated to zinc concentration in the feed SPA phase, together with data extracted from previous laboratory-scale experiments, allowing us to obtain the design parameter that will enable the leap to the industrial scale. Therefore, the results herein presented demonstrate the NDSX technology in an industrially relevant environment equivalent to TRL 6, which is an essential progress to increase zinc metal resources in the galvanizing sector.

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Extraction and stripping behavior of hydrochloric acid from aqueous solution by Cyanex 923/TEHA and its mixtures

Cited by 3 publications

References 21 publications

Selective Separation of HNO₃ and HCl by Extraction: The Investigation on the Noncovalent Interaction between Extractants and Acids by Density Functional Theory

Selective Separation of HNO₃ and HCl by Extraction: The Investigation on the Noncovalent Interaction between Extractants and Acids by Density Functional Theory

Solvent Extraction of Hydrochloric Acid Using Commercial Extractants and Synthesized Ionic Liquids

Scale-Up of Membrane-Based Zinc Recovery from Spent Pickling Acids of Hot-Dip Galvanizing

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Extraction and stripping behavior of hydrochloric acid from aqueous solution by Cyanex 923/TEHA and its mixtures

Cited by 3 publications

References 21 publications

Selective Separation of HNO3 and HCl by Extraction: The Investigation on the Noncovalent Interaction between Extractants and Acids by Density Functional Theory

Selective Separation of HNO3 and HCl by Extraction: The Investigation on the Noncovalent Interaction between Extractants and Acids by Density Functional Theory

Solvent Extraction of Hydrochloric Acid Using Commercial Extractants and Synthesized Ionic Liquids

Scale-Up of Membrane-Based Zinc Recovery from Spent Pickling Acids of Hot-Dip Galvanizing

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Product

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Selective Separation of HNO₃ and HCl by Extraction: The Investigation on the Noncovalent Interaction between Extractants and Acids by Density Functional Theory

Selective Separation of HNO₃ and HCl by Extraction: The Investigation on the Noncovalent Interaction between Extractants and Acids by Density Functional Theory