Abstract:
The invention relates to a continuous method for separation of a mixture of hydrocarbons by extractive distillation having a mixture of a polar aprotic solvent and water as a selective solvent, in a system comprising an extractive distillation column and an outgas column, characterized in that the method is carried out under continuous measurement of the water content of the selective solvent via NIR spectroscopy, wherein the measured values from the continuous measurement of the water content of the selective solvent are compared to a specified target value and regulated to a value within a specified concentration range above and below the target value by addition or exfiltration of water or by addition of polar aprotic solvent.
Abstract:
A process for preparing acrylic acid from ethylene oxide and carbon monoxide, in which ethylene oxide is carbonylated in an aprotic solvent with carbon monoxide in the presence of a cobalt catalyst system to give poly-3-hydroxypropionate, the cobalt content in the poly-3-hydroxypropionate formed is reduced with the aid of water and/or an aqueous solution as a precipitation and/or wash liquid, and the poly-3-hydroxypropionate is subsequently split by thermolysis to give acrylic acid.
Abstract:
Ein Verfahren zur Herstellung von Acrylsäure durch Thermolyse von Poly-3-hydroxypropionat im Beisein eines oder mehrerer spezieller tertiärer Amine als Katalysator.
Abstract:
A method for producing acrylic acid by thermolysis of poly-3-hydroxy propionate in the presence of one or more specific tertiary amines as catalysts.
Abstract:
A method for producing acrylic acid by thermolysis of poly-3-hydroxy propionate in the presence of one or more specific tertiary amines as catalysts.
Abstract:
A process for preparing acrylic acid from ethylene oxide and carbon monoxide, in which ethylene oxide is carbonylated in an aprotic solvent with carbon monoxide in the presence of a cobalt catalyst system to give poly-3-hydroxypropionate, the cobalt content in the poly-3-hydroxypropionate formed is reduced with the aid of water and/or an aqueous solution as a precipitation and/or wash liquid, and the poly-3-hydroxypropionate is subsequently split by thermolysis to give acrylic acid.
Abstract:
Ein Verfahren zur Herstellung von Acrylsäure aus Ethylenoxid und Kohlenmonoxid, bei dem Ethylenoxid in einem nicht protischen Lösungsmittel mit Kohlenmonoxid in Anwesenheit eines Co-haltigen Katalysatorsystems zu Poly-3-hydroxypropionat carbonyliert, der Gehalt des gebildeten Poly-3-hydroxypropionats an Co mit Hilfe von Wasser und/oder einer wässrigen Lösung als Fäll- und/oder Waschflüssigkeit vermindert und das Poly-3-hydroxypropionat nachfolgend durch Thermolyse zu Acrylsäure gespalten wird.