A process and extractant composition for extracting acids

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 51/48 (2006.01) B01D 11/04 (2006.01) C07C 59/08 (2006.01) C07C 59/265 (2006.01)

Patent

CA 2185575

The invention provides a process for the recovery of a water soluble carboxylic or mineral acid having a pKa higher than 2 from an aqueous feed solution containing the acid or a salt thereof, comprising extracting the acid with a water-immiscible extractant composition, the composition comprising: (a) at least one secondary or tertiary alkyl amine, in which the aggregate number of carbon atoms is at least 20, as a primary extractant; and (b) a sterically hindered, polar, organic compound having at least 5 carbon atoms, a basicity weaker than that of the primary extractant, and temperature-sensitive, extraction-modifying properties; separating the acid containing the extractant and subjecting it to a stripping operation at a temperature of at least 20 °C higher than the temperature at which the extraction is carried out, wherein the sterically hindered, polar, organic compound both modifies the extracting power of the primary extractant composition and facilitates the temperature-sensitive stripping operation. The invention also provides an extractant composition for use in such a process.

L'invention se rapporte à un procédé de récupération d'un acide carboxylique ou minéral soluble dans l'eau ayant un pKa supérieur à 2, à partir d'une solution de départ aqueuse contenant l'acide ou un sel de celui-ci. Ce procédé consiste à extraire l'acide à l'aide d'une composition d'extraction nonmiscible dans l'eau, cette composition comprenant: (a) au moins une amine d'alkyle secondaire ou tertiaire, dans laquelle le nombre total des atomes de carbone est d'au moins 20, comme solvant d'extraction primaire; et (b) un composé organique polaire à empêchement stérique possèdant au moins 5 atomes de carbone, une basicité plus faible que celle du solvant d'extraction primaire, et des propriétés modifiant l'extraction, sensibles à la température; à séparer l'acide contenant le solvant d'extraction et à le soumettre à une opération de rectification à une température supérieure d'au moins 20 ~C à la température à laquelle est effectuée l'extraction. Le composé organique polaire à empêchement stérique modifie à la fois la puissance d'extraction de la composition d'extraction primaire et facilite l'opération de rectification sensible à la température. L'invention se rapporte également à une composition s'utilisant dans ce type de procédé.

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