Method for separating maleic anhydride from maleic...

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 51/573 (2006.01) C07C 29/149 (2006.01) C07C 29/17 (2006.01) C07C 31/20 (2006.01) C07C 57/145 (2006.01) C07C 67/08 (2006.01) C07C 69/60 (2006.01) C07D 307/08 (2006.01) C07D 307/33 (2006.01)

Patent

CA 2318114

The invention relates to a method for separating maleic anhydride from the maleic anhydride-containing reactor waste gases resulting from maleic anhydride production by hydrocarbon oxidation. According to said method the gas stream is placed into contact with a high-boiling inert absorption agent for maleic anhydride and maleic anhydride is separated from the resulting liquid absorbate phase by steam stripping. An alcohol is used as desorption agent and maleic anhydride at least partly reacts with the alcohol to yield an ester.

L'invention concerne un procédé de séparation de l'anhydride d'acide maléique contenu dans des gaz de réacteur évacués contenant de l'anhydride d'acide maléique, qui résultent de la production d'anhydride d'acide maléique par oxydation d'hydrocarbures. Selon ledit procédé, ce courant de gaz est mis en contact avec un agent d'absorption de l'anhydride d'acide maléique inerte et à point d'ébullition élevé, et l'anhydride d'acide maléique est séparé par désorption en phase vapeur à partir de la phase absorbée liquide obtenue, l'agent de désorption utilisé étant un alcool et l'anhydride de l'acide maléique réagissant au moins partiellement avec l'alcool pour former un ester.

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