Method for separating maleic anhydride from mixtures...

B - Operations – Transporting – 01 – D

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B01D 3/34 (2006.01) B01D 53/14 (2006.01)

Patent

CA 2577714

The invention relates to a method for separating maleic anhydride from a gas flow containing maleic anhydride. According to said method: a) the gas flow containing maleic anhydride is brought into contact with a liquid absorbent phase containing at least one high-boiling inert absorption agent for maleic anhydride, and b) maleic anhydride is separated from the obtained liquid absorbate phase by stripping in a column using hydrogenous gas as a stripping agent. The invention is characterised in that the stripping agent is supplied to the column at two points separated by at least one theoretical separating stage.

L'invention concerne un procédé pour séparer de l'anhydride d'acide maléique d'un flux gazeux en contenant, selon lequel le flux gazeux contenant de l'anhydride d'acide maléique est mis en contact avec une phase d'absorbant liquide contenant au moins un agent d'absorption inerte à point d'ébullition élevé pour l'anhydride d'acide maléique et, sur la base de la phase liquide du produit absorbé ainsi obtenu, l'anhydride d'acide maléique est séparé par stripage dans une colonne au moyen d'un gaz contenant de l'hydrogène comme agent de stripage. L'invention est caractérisée en ce que l'agent de stripage est introduit dans la colonne en deux emplacements espacés l'un de l'autre par au moins un étage de séparation théorique.

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