C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 59/147 (2006.01) C07C 51/48 (2006.01) C07D 201/08 (2006.01) C07D 221/08 (2006.01) C07D 223/10 (2006.01)
Patent
CA 2226150
Process to separate linear 5-formylvaleric acid from a mixture of 5- and 3- and 4-formylvaleric acids, wherein the separation is performed by fractional extraction with two immiscible solvents of which one solvent is an aqueous solvent and the other solvent is an organic solvent, in which the organic solvent has a higher or lower affinity for 5-formylvaleric acid than its affinity for the 3-formylvaleric acids and for the 4-formylvaleric acid. Furthermore the invention relates to an improved process to prepare .epsilon.- caprolactam starting from a mixture of branched and linear formylvaleric acids or starting from pentenoic acid.
L'invention concerne un procédé pour séparer l'acide 5-formylvalérique linéaire d'un mélange d'acides 5-, 3- et 4-formylvalériques. La séparation se fait par extraction fractionnée avec deux solvants non miscibles dont un est un solvant aqueux et l'autre est un solvant organique, ce dernier ayant une affinité plus grande ou plus faible pour l'acide 5-formylvalérique que pour les acides 3-formylvalériques et pour l'acide 4-formylvalérique. En outre, l'invention concerne un procédé amélioré de préparation du .epsilon.-caprolactame à partir d'un mélange d'acides formylvalériques linéaires et ramifiés, ou à partir de l'acide penténoïque.
Gelling Onko Jan
Guit Rudolf Philippus Maria
Niemann Simon Hans
Simons Antonius Jacobus Franciscus
Toth Imre
Dsm N.v.
E.i. Du Pont de Nemours And Company
Fetherstonhaugh & Co.
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