Abstract:
The invention relates to a process for working-up a reaction mixture (5) comprising polyetherol and dissolved alkali metal comprising catalyst, wherein at least alkali metal ions of the dissolved alkali metal comprising catalyst are partially or completely removed from the mixture by a membrane separation process, the process comprising following steps: (a) feeding the reaction mixture (5) comprising polyetherol and dissolved alkali metal comprising catalyst into a first chamber (1) of a separation unit (3), (b) feeding a solvent into a second chamber (7) of the separation unit (3), the first chamber (1) and the second chamber (7) being separated by a membrane (9), (c) transporting at least the alkali metal ions of the alkali metal comprising catalyst from the first chamber (1) into the second chamber by passing through the membrane (9).
Abstract:
Gegenstand der Erfindung Verfahren zu Herstellung von Polyetheralkoholen d) durch Umsetzung von a) mindestens einer Verbindung mit mindestes drei mit Alkylenoxiden reaktiven Wasserstoffatomen mit einem Molekulargewicht Mn von maximal 600 g/mol mit b) Alkylenoxiden unter Verwendung von c) Katalysatoren, dadurch gekennzeichnet, dass die Umsetzung in Gegenwart eines Polyetheralkohols d) mit einer Hydroxylzahl von 100-800 mg KOH/g und einer Funktionalität von 1,5 bis 8 durchgeführt wird.
Abstract:
This invention relates to a process for the continuous production of polyether polyols, polyether polyols produced by the inventive continuous process and their use in polyurethane applications.
Abstract:
The present invention relates to a process for the continuous production of polyether alcohols by catalyzed addition of at least one alkylene oxide to at least one hydrogen-functional starter compound, wherein at least one catalyst exhibits the structural element R1/R2C=N-R3.
Abstract:
The invention relates to a process for a continuous production of polyetherols comprising the steps of reacting of an alcohol (3) with a starter (5) or an alkoxylated precursor to give a mixture comprising an alcoholate and water, removing the water from the mixture by distillation,if appropriate feeding the alcoholate into a bubble column (23), having an inclination of from 0 to 90 to the horizontal, the bubble column (23)being divided into at least two compartments (25), wherein the compartments (25) are divided from each other by a dividing wall (27), the dividing wall (27) having a height, that liquid can flow over the dividing wall (27) from one compartment (25) into an adjacent compartment, feeding of alkylene oxide into at least one compartment (25) at the bottom of the compartment such that the alkylene oxide rises in the alcoholate, reacting of the alkylene oxide with the alcoholate or a secondary product being formed by the reaction of the alcoholate with alkylene oxide to give the polyetherol, discharging the reaction product from the bubble column (23).
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur katalytischen Herstellung von PoIyetherolen, dadurch gekennzeichnet, dass der Leistungseintrag durch mindestens einen Rührer und/oder durch mindestens eine Pumpe, bezogen auf das Reaktorvolumen, im Bereich von 0,001 bis 8,2 kW/ m 3 liegt.
Abstract:
Verfahren zur Herstellung von Polyetherolen, umfassend die folgenden Schritte: a) Umsetzen mindestens einer Starterverbindung mit mindestens einem Alkylenoxid und einem Katalysator zu einem Rohpolyetherol und b) Entfernung von niedermolekularen Nebenprodukten aus dem Rohpolyetherol aus Schritt a), dadurch gekennzeichnet, dass das Rohpolyetherol mit einem Strippgas in einer Kolonne mit Einbauten behandelt wird.
Abstract:
The invention relates to a process for a continuous production of polyetherols comprising the steps of reacting of an alcohol (3) with a starter (5) or an alkoxylated precursor to give a mixture comprising an alcoholate and water, removing the water from the mixture by distillation,if appropriate feeding the alcoholate into a bubble column (23), having an inclination of from 0 to 90 to the horizontal, the bubble column (23)being divided into at least two compartments (25), wherein the compartments (25) are divided from each other by a dividing wall (27), the dividing wall (27) having a height, that liquid can flow over the dividing wall (27) from one compartment (25) into an adjacent compartment, feeding of alkylene oxide into at least one compartment (25) at the bottom of the compartment such that the alkylene oxide rises in the alcoholate, reacting of the alkylene oxide with the alcoholate or a secondary product being formed by the reaction of the alcoholate with alkylene oxide to give the polyetherol, discharging the reaction product from the bubble column (23).