Extraction of Strong Mineral Acids by Organic Acid-Base Couples

Aharon Eyal; Avraham Baniel

doi:10.1021/i200017a019

Extraction of Strong Mineral Acids by Organic Acid-Base Couples

Aharon Eyal, Avraham Baniel

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

A new method is described for the separation of strong mineral acids from other species present in aqueous solutions, by liquid-liquid extraction. An extracted acid can be recovered by backwashing of the extractant phase with water at concentrations approaching those in the original solutions. Even higher concentrations may be obtained using common ion effects or temperature effects. Extractants consist of a strong organic acid and an amine dissolved in a carrier solvent. Both the organic acid and the amine are water insoluble, in free and in salt form. Extractant characteristics to satisfy the requirements of a given process are obtained through the selection of the acid and of the amine that form the extracting couple and adjustment of their molar ratio. Processes achievable include the separation and recovery of acids from mixtures of acids (e.g., recovery of H₂SO₄, H₂SiF₆, and H₃PO₄ from “wet process” phosphoric acid) and conversions by reaction in acid media (e.g. conversion of KCI to KNO₃ by HNO₃ with the recovery of concentrated HCI).

Original language	English
Pages (from-to)	334-337
Number of pages	4
Journal	Industrial and Engineering Chemistry Process Design and Development
Volume	21
Issue number	2
DOIs	https://doi.org/10.1021/i200017a019
State	Published - 1 Apr 1982

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title = "Extraction of Strong Mineral Acids by Organic Acid-Base Couples",

abstract = "A new method is described for the separation of strong mineral acids from other species present in aqueous solutions, by liquid-liquid extraction. An extracted acid can be recovered by backwashing of the extractant phase with water at concentrations approaching those in the original solutions. Even higher concentrations may be obtained using common ion effects or temperature effects. Extractants consist of a strong organic acid and an amine dissolved in a carrier solvent. Both the organic acid and the amine are water insoluble, in free and in salt form. Extractant characteristics to satisfy the requirements of a given process are obtained through the selection of the acid and of the amine that form the extracting couple and adjustment of their molar ratio. Processes achievable include the separation and recovery of acids from mixtures of acids (e.g., recovery of H2SO4, H2SiF6, and H3PO4 from “wet process” phosphoric acid) and conversions by reaction in acid media (e.g. conversion of KCI to KNO3 by HNO3 with the recovery of concentrated HCI).",

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AB - A new method is described for the separation of strong mineral acids from other species present in aqueous solutions, by liquid-liquid extraction. An extracted acid can be recovered by backwashing of the extractant phase with water at concentrations approaching those in the original solutions. Even higher concentrations may be obtained using common ion effects or temperature effects. Extractants consist of a strong organic acid and an amine dissolved in a carrier solvent. Both the organic acid and the amine are water insoluble, in free and in salt form. Extractant characteristics to satisfy the requirements of a given process are obtained through the selection of the acid and of the amine that form the extracting couple and adjustment of their molar ratio. Processes achievable include the separation and recovery of acids from mixtures of acids (e.g., recovery of H2SO4, H2SiF6, and H3PO4 from “wet process” phosphoric acid) and conversions by reaction in acid media (e.g. conversion of KCI to KNO3 by HNO3 with the recovery of concentrated HCI).

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Extraction of Strong Mineral Acids by Organic Acid-Base Couples

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