METHOD FOR PRODUCING PROPYLENE OXIDE

The invention relates to a method for producing propylene oxide, comprising at least the following steps: (a) propene is reacted with a hydroperoxide in a solvent in the presence of a zeolite catalyst, in order to obtain a mixture (G0), said mixture (G0) containing propylene oxide, solvent, non-reac...

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1. Verfasser: NORBERT RIEBER
Format: Patent
Sprache:eng ; spa
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Zusammenfassung:The invention relates to a method for producing propylene oxide, comprising at least the following steps: (a) propene is reacted with a hydroperoxide in a solvent in the presence of a zeolite catalyst, in order to obtain a mixture (G0), said mixture (G0) containing propylene oxide, solvent, non-reacted propene, non-reacted hydroperoxide and oxygen; (b) the propylene oxide is separated from the mixture (G0) in such a way that a mixture (G1) is obtained which comprises non-reacted propene and oxygen; (c) the mixture (G1) is brought into contact with a liquid medium containing at least solvent, in order to obtain the mixtures (G2) and (G3), said mixture (G3) containing a part of the non-reacted propene and oxygen, and said mixture (G2) containing the solvent and the rest of the propene, the separated mixture (G3) of non-reacted propene and oxygen having a ratio of oxygen to propene which renders the mixture (G3) non-inflammable, and the mixture (G2) supplying at least one reaction between the propene and the hydroperoxide. Un proceso para preparar oxido de propileno comprende cuando menos los siguientes pasos: (a) se hace reaccionar propeno con un hidroperoxido en un solvente en presencia de un catalizador de zeolita para proporcionar una mezcla (M0), en donde la mezcla (M0) comprende oxido de propileno, solvente, propeno no reaccionado, hidroperoxido no reaccionado y oxigeno, b) el oxido de propileno se separa de la mezcla (M0) de manera de proporcionar una mezcla (M1) que comprende propeno no reaccionado y oxigeno, c) la mezcla (M1) se pone en contacto con un medio liquido que comprende cuando menos un solvente para proporcionar las mezclas (M2) y (M3), e donde la mezcla (M3) comprende parte del propeno n reaccionado y oxigeno y la mezcla (M2) comprende solvente y propeno residual, y 1 mezcla (M3) que se ha separado y comprende propeno no reaccionado y oxigeno tiene una relacion d oxigeno a propeno tal que la mezcla (M3) no es inflamable, y 1 mezcla (M2) se alimenta a cuando menos una reaccion de propeno con hidroperoxido.