Method for producing a free acid from the salt thereof

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 51/02 (2006.01) C07C 55/00 (2006.01) C07C 55/10 (2006.01) C07C 59/00 (2006.01) C07C 59/01 (2006.01) C07C 59/08 (2006.01) C07C 63/00 (2006.01) C07C 65/00 (2006.01) C07C 309/01 (2006.01) C07F 9/38 (2006.01)

Patent

CA 2752950

The invention relates to an improved method for releasing an organic acid, preferably a carbon, sulfone or phosphone acid, particularly an alpha or beta hydroxycarbon acid, from the ammonia salt thereof by releasing and removing ammoniac and simultaneous extraction of the released acid, having an amine as a suitable extraction means from the aqueous phase. This method corresponds to a reactive extraction. The reactive extraction of an organic acid from the aqueous ammonia salt solution thereof can be significantly improved by the use of a strip medium or carrier gas, such as nitrogen, air, water vapor or inert gases such as argon. The released ammoniac is removed from the aqueous solution by the continuous gas flow and can be resupplied into a production process. The free acid can be obtained by a method such as distillation, rectification, crystallization, reextraction, chromatography, adsorption or by a membrane method from the extraction means.

La présente invention concerne un procédé amélioré de dégagement d'un acide organique, de préférence d'un acide carboxylique, sulfonique ou phosphonique, en particulier d'un acide alpha- ou bêta-hydroxycarboxylique, à partir de leurs sels d'ammonium par dégagement et séparation d'ammoniac, tout en extrayant l'acide en dégagement au moyen d'une amine constituant un milieu approprié à l'extraction à partir de la phase aqueuse. Ce procédé correspond à une extraction réactive. L'extraction réactive d'un acide organique de sa solution aqueuse de sels d'ammonium est notoirement améliorée par la mise en uvre d'un milieu de désorption ou d'un gaz vecteur tel que l'azote, l'air, la vapeur d'eau, ou des gaz inertes tel que l'argon par exemple. Le flux gazeux continu provenant de la solution aqueuse élimine l'ammoniac qui se dégage et qui peut alors être réinjecté dans un circuit de production. On pourra ensuite recourir à un traitement de distillation, rectification, cristallisation, réextraction, chromatographie, adsorption ou un procédé à membrane pour récupérer l'acide libre se dégageant du milieu d'extraction.

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