摘要:
The present invention relates to a method for producing polyethylene carbonate (PEC) from ethylene oxide and carbon dioxide by using Zeolite-P 2 S 5 -Me catalysts (Me: Zn, Co, Cr, Ni). The catalyst can be used repeatedly without degradation as it can be regained.
摘要:
The invention relates to a method for producing polyether carbonate polyols, comprising the step of reacting alkylene oxide with carbon dioxide in the presence of an h-functional starter compound and double metal cyanide catalyst. The invention is characterized in that the method comprises the following steps: (α) optionally, pre-treating the double metal cyanide catalyst (DMC catalyst) at a temperature of 50 to 200⁰C and/or reduced pressure (absolute) of 10 mbar to 800 mbar; (ß) bringing the double metal cyanide catalyst in contact with suspension means, and furthermore, with alkylene oxide in a first reactor thus obtaining a first reaction mixture, and (γ) continuous added dosing of the first reaction mixture, alkaline oxide, and carbon oxide, and optionally, h-functional starter compound in a second reactor, wherein in at least one of the steps (ß) or (γ), at least one h-functional starter compound is used, and wherein reaction products formed in step (γ) are continuously removed from the second reactor.
摘要:
This invention relates to a semi-batch process for producing low molecular weight polyoxyalkylene polyols. These polyoxyalkylene polyols are characterized by hydroxyl numbers of from 200 to 500. In accordance with the invention, the first alkylene oxide block used to activate the DMC catalyst comprises from 50% to 100% by weight of propylene oxide and from 0% to 50% by weight of ethylene oxide; and the second alkylene oxide block comprises from 50% to 100% by weight of propylene oxide and from 0% to 50% by weight of ethylene oxide. A continuously added starter is present. Optionally, a third alkylene oxide block can be added. The addition of the second alkylene oxide block and of the third alkylene oxide block when present is completed with a space time yield of greater than or equal to 250 kg/m 3 /hr.
摘要:
Implementations described herein generally relate to etheramine mixtures formed from a mixture of two or more multifunctional alcohol initiators, processes for the etheramine mixtures production, and its use as a curing agent or as a raw material in the synthesis of polymers. In one implementation, the process comprises mixing a polyol initiator having a melting point greater than a processing temperature and a polyol initiator having a melting point less than the processing temperature to form a polyol initiator mixture having a melting point less than the processing temperature, charging the polyol initiator mixture to an alkoxylation reaction zone, contacting the polyol initiator mixture with an alkylene oxide in the alkoxylation reaction zone to provide a mixture of alkoxylated precursor polyols and charging the mixture of alkoxylated precursor polyols to a reductive amination zone and reductively aminating the mixture of alkoxylated precursor polyols to form the etheramine mixture.
摘要:
Implementations described herein generally relate to etheramine mixtures formed from a mixture of two or more multifunctional alcohol initiators, processes for the etheramine mixtures production, and its use as a curing agent or as a raw material in the synthesis of polymers. In one implementation, the process comprises mixing a polyol initiator having a melting point greater than a processing temperature and a polyol initiator having a melting point less than the processing temperature to form a polyol initiator mixture having a melting point less than the processing temperature, charging the polyol initiator mixture to an alkoxylation reaction zone, contacting the polyol initiator mixture with an alkylene oxide in the alkoxylation reaction zone to provide a mixture of alkoxylated precursor polyols and charging the mixture of alkoxylated precursor polyols to a reductive amination zone and reductively aminating the mixture of alkoxylated precursor polyols to form the etheramine mixture.
摘要:
The invention relates to a polymer structure (1) formed by at least a polymer, wherein said structure (1) comprises a volume (2) and a surface (3), wherein said polymer comprises a plurality of polymer chains connected by linkings, characterized by a linking density, wherein said linking density increases, particularly monotonously, from the surface (3) into the volume (2) of the polymer structure (1).
摘要:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Polyethercarbonatpolyolen, umfassend den Schritt der Reaktion von Alkylenoxid mit Kohlendioxid in Gegenwart einer H-funktionellen Starterverbindung und Doppelmetallcyanid-Katalysator, dadurch gekennzeichnet, dass das Verfahren die folgenden Schritte umfasst: (α) gegebenenfalls Vorbehandeln des Doppelmetallcyanid-Katalysators (DMC-Katalysators) bei einer Temperatur von 50 bis 200 °C und/oder reduziertem Druck (absolut) von 10 mbar bis 800 mbar, (β) Inkontaktbringen des Doppelmetallcyanid-Katalysators mit Suspensionsmittel und weiterhin mit Alkylenoxid in einem ersten Reaktor unter Erhalt einer ersten Reaktionsmischung; und (γ) kontinuierliches Hinzudosieren der ersten Reaktionsmischung, Alkylenoxid und Kohlendioxid und gegebenenfalls H-funlctioneller Starterverbindung in einen zweiten Reaktor,
wobei wenigstens in einem der Schritte (β) oder (γ) mindestens eine H-funktionelle Starterverbindung eingesetzt wird.