C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 307/34 (2006.01) C07C 51/64 (2006.01)
Patent
CA 2647083
The subject matter of the present invention relates to a method for preventing fumaric acid deposits during the production of maleic acid anhydride consisting of the following steps: a) absorption of a C4-dicarbonic acid or a derivative thereof from a raw product mixture into an organic solvent or water as an absorbent, (b) separation of the C4-dicarbonic acid or a derivative thereof from said absorbent, wherein the absorbent thus recovered is either completely or partially hydrogenated catalytically and is returned to absorption stage (a) either completely or partially.
L'objet de la présente invention est un procédé destiné à éviter les dépôts d'acide fumarique lors de la fabrication d'anhydride d'acide maléique, ledit procédé comportant les étapes suivantes : a) absorption d'un acide dicarboxylique C4 ou d'un dérivé provenant d'un mélange de produit brut dans un solvant organique ou de l'eau comme agent d'absorption, b) séparation de l'acide dicarboxylique C4 ou d'un dérivé de l'agent d'absorption, l'agent d'absorption ainsi obtenu étant complètement ou partiellement hydraté de manière catalytique et ramené complètement ou partiellement à la phase d'absorption (a).
Dahlhoff Ellen
Heimann Jens
Kaibel Gerd
Pinkos Rolf
Windecker Gunther
Basf Se
Robic
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