C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 57/04 (2006.01) C07C 51/21 (2006.01) C07C 51/43 (2006.01)
Patent
CA 2198142
Acrylic acid or methacrylic acid is purified by (a) subjecting a mixture comprising the acrylic acid or methacrylic acid to a sharply defined separation process essentially in the absence of an organic solvent, with the composition of the phase in which the acrylic acid or methacrylic acid accumulates remaining essentially constant when the composition of the other phases participating in the mass transfer changes, then taking off this phase and (b) subjecting at least a part of the remaining phase from stage(a) to a less sharply defined separation process and (c) feeding one of the phases formed in stage (b) to the sharply defined separation process in stage (a). In addition, the invention provides a process for preparing acrylic acid or methacrylic acid which includes the abovementioned purification process.
'acide acrylique ou l'acide méthacrylique sont purifiés en (a) soumettant un mélange comprenant l'acide acrylique ou l'acide méthacrylique à un procédé de séparation essentiellement en absence de solvant organique, la composition de la phase dans laquelle l'acide acrylique ou l'acide méthacrylique s'accumule demeurant essentiellement constante, alors que celle des autres phases intervenant dans le transfert de masse change, puis en soutirant cette phase et (b) en soumettant au moins une partie de la phase restante de l'étape (a) à un procédé de séparation moins fine et (c) en soumettant une des phases formées à l'étape (b) au procédé de séparation fine de l'étape (a). De plus, l'invention décrit un procédé permettant de préparer de l'acide acrylique ou de l'acide méthacrylique comprenant le procédé de purification susmentionné.
Dams Albrecht
Eck Bernd
Machhammer Otto
Proll Theo
Basf Aktiengesellschaft
Dams Albrecht
Eck Bernd
Machhammer Otto
Proll Theo
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