Study on the extraction mechanism and the phase equilibrium of fluorosilicic acid with Trioctylamine

• Autorzy: Yang Lisha , Li Tianxiang , Yang Jiayou , Xie Juan , Liu Xu , Zhu Jing , Liu Songlin

Identyfikatory

DOI

10.2478/pjct-2025-0002

• Języki publikacji: EN

Abstrakty

EN

Solvent extraction technology was applied to extract fluorosilicic acid from aqueous solution with trioctylamine (TOA) as extractant. The extraction mechanism of fluorosilicic acid with TOA was studied via stoichiometry methods combined with spectroscopic methods. The results of saturation capacity method and equimolar methods showed that there were two kinds of organic extracts produced with molar ratio of 1: 1 and 2: 1 in the system, whose chemical formulas were (R₃N · H₂SiF₆)₃ and [(R₃N)₂ · H₂SiF₆]₂, respectively. Fuorosilicic acid was extracted with TOA via hydrogen bonds. The liquid-liquid phase equilibria of the ternary system fluorosilicic acid (1)-water (2)-TOA (3) from 283.15 K to 323.15 K were determined. The equilibrium phase diagram of the ternary system is obtained. The partition coefficient and separation factor were calculated to evaluate the extraction capacity of TOA for fluorosilicic acid, which showed that TOA exhibited high selectivity.

Słowa kluczowe

EN

solvent extraction technology; fluorosilicic acid; Trioctylamine; extraction mechanism; liquid-liquid phase equilibrium

• Wydawca: West Pomeranian University of Technology. Publishing House
• Czasopismo: Green Sciences
• Rocznik: 2025
• Tom: Vol. 27, nr 1
• Strony: 11--22
• Opis fizyczny: Bibliogr. 68 poz., rys., tab., wykr., wz.

Twórcy

autor

Yang Lisha

• School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, Guizhou, China

autor

Li Tianxiang

• School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, Guizhou, China

autor

Yang Jiayou

• School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, Guizhou, China

autor

Xie Juan

• State Key Laboratory of High Efficient Utilization of Middle and Low Grade Phosphate Rock and Its Associated Resources, Guiyang 550014, China
• WengFu Group Co. Ltd., Guiyang 550014, China

autor

Liu Xu

• State Key Laboratory of High Efficient Utilization of Middle and Low Grade Phosphate Rock and Its Associated Resources, Guiyang 550014, China
• WengFu Group Co. Ltd., Guiyang 550014, China

autor

Zhu Jing

• School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, Guizhou, China

autor

Liu Songlin

• Guizhou Phosphate Chemical Group, Guiyang 550081, China

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