Treatment of formaldehyde-containing mixtures

Details Treatment of formaldehyde-containing mixtures Treatment of formaldehyde-containing mixtures

C - Chemistry, Metallurgy

07

C

C07C 67/343 (2006.01) C07C 51/353 (2006.01) C07C 57/04 (2006.01) C07C 67/58 (2006.01) C07C 69/54 (2006.01)

Patent

CA 2289482

A process for the removal of formaldehyde species from a liquid carboxylic acid or carboxylic acid ester stream which forms a two-phase mixture with water is disclosed which comprises the step of subjecting the liquid organic mixture to at least one liquid liquid extraction stage wherein water is used as an extractant to produce an organic phase stream which is substantially formaldehyde free and an aqueous phase stream which contains substantially all of the formaldehyde in the output streams from the liquid liquid extraction. The process is particularly useful for reducing the formaldehyde content of a methyl methacrylate product stream.

L'invention porte sur un procédé visant à retirer des espèces de formaldéhyde d'un courant liquide d'acide carboxylique ou d'ester d'acide carboxylique qui forme un mélange biphasique avec de l'eau. Ce procédé consiste à soumettre le mélange organique liquide à au moins une étape d'extraction liquide/liquide. L'eau est utilisée comme agent d'extraction pour produire un courant de phase organique pratiquement exempt de formaldéhyde et un courant de phase aqueuse contenant pratiquement la totalité du formaldéhyde dans les courants de sortie de l'extraction liquide/liquide. Ce procédé est notamment utile pour réduire la teneur en formaldéhyde d'un courant de produit de méthacrylate de méthyle.

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