Process and apparatus for the dehydration of maleic acid

C - Chemistry – Metallurgy – 07 – D

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23/395.2, 260/36

C07D 307/60 (2006.01) B01D 1/06 (2006.01) B01D 3/28 (2006.01) C07C 51/56 (2006.01)

Patent

CA 1207782

PRECIS DE LA DIVULGATION Le procédé comprend une première étape de concentration d'une solution aqueuse d'acide maléique, et une seconde étape de déshydratation de l'acide maléique concentré en anhydride maléique, l'acide concentré admis dans cette étape de déshydratation étant additionné d'anhydride maléique, chacune des deux étapes étant réalisée par évaporation en couche mince à co-courants liquide-vapeur dans au moins un évaporateur tubulaire statique. Application à la purification de l'anhydride maléique. Figure.

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