Covestro Deutschland Ag

Bayer Intellectual Property Gmbh

Covestro Intellectual Property Gmbh & Co. Kg

Matthias Wohak

Jörg Hofmann

Christoph Gürtler

Thomas Ernst Müller

Aurel Wolf

Stefanie Braun

Walter Leitner

Muhammad Afzal Subhani

Hartmut Nefzger

Kai Laemmerhold

Michael Traving

Ilja Peckermann

Hans-Georg Pirkl

Rolf Bachmann

Jens Langanke

Urs Rauwald

Horst Zwick

Thomas Runowski

Lars Krueger

Cyrus Ahmadzade-Youssefi

Werner Bäcker

Maurice Cosemans

Jürgen Bausa

Nicole Welsch

Carlson Torren

Maria Francisco Casal

Thomas Ernst MÜLLER

The invention relates to a method for producing polyether carbonate polyols by adding alkylene oxides and carbon dioxide to an H-functional starter substance in the presence of a double metal cyanide (DMC) catalyst or in the presence of a metal complex catalyst based on the metals zinc and/or cobalt, wherein (&#x3b3;) alkylene oxide and carbon dioxide are added to an H-functional starter substance in a reactor with a total pressure (absolute) of 5 to 120 bar in the presence of a double metal cyanide catalyst or in the presence of a metal complex catalyst based on the metals zinc and/or cobalt, and a reaction mixture containing the polyether carbonate polyol is obtained, (&#x3b4;) the reaction mixture obtained in step (&#x3b3;) remains in the reactor or is optionally continuously transferred to a downstream reactor at a starting total pressure (absolute) of 5 to 120 bar, the content of free alkylene oxide in the reaction mixture being reduced in the course of a downstream reaction in each case, and the total pressure (absolute) can be reduced by up to 50% during the step (&#x3b4;), and (&#x3b6;) the content of highly volatile components of the obtained reaction mixture is thermally reduced at a temperature of 80&#xb0; C. to 200&#xb0; C. The invention is characterized in that (&#x3b5;) the reaction mixture resulting from step (&#x3b4;) is brought to a total pressure (absolute) of &#x2264;2.0 bar, preferably 0.5 bar to 2.0 bar, particularly preferably 0.9 bar to 1.1 bar, prior to step (&#x3b6;) and then left at a temperature of 80 to 180&#xb0; C. for a dwell time of at least 0.5 h. After the dwell time has expired, 5 to 100 ppm of component K is added to the resulting mixture, component K being selected from at least one compound which contains a phosphorus-oxygen-hydrogen group.

Method for producing polyether carbonate polyols

The present invention relates to a purifying apparatus for polycarbonate polyols, especially for removal of cyclic alkylene carbonates, comprising an evaporation unit () provided with a heater () and having an inlet () disposed at the top end thereof and a bottoms vessel (), and a stripping column () connected downstream of the evaporation unit () and having a top () and a bottom (), wherein a feed () for the polycarbonate polyol to be purified opens into the inlet () to the evaporation unit () and a gas outlet line () and a connecting line which opens into the top () of the stripping column () and is equipped with a pump () depart from the evaporation unit (), and wherein a gas inlet line () for an inert gas opens into the bottom () of the stripping column () and a product line () for the purified polycarbonate polyol departs from the bottom () of the stripping column () and a gas outlet line () departs from the top () of the stripping column (). The invention additionally relates to a process for purifying polycarbonate polyols with such a purifying apparatus.

Process for purifying polycarbonate polyols and purifying apparatus therefor

The present invention relates to a method for producing polyether carbonate polyols by addition of one or more alkylene oxides and carbon dioxide to one or more H-functional starter substances in the presence of at least one DMC catalyst, in which the reaction is conducted in a main reactor () and a tubular reactor () connected as a post reactor downstream thereof, wherein the method is characterized in that at the outlet () of the tubular reactor () a temperature is set that is at least 10&#xb0; C. above the temperature in the inside of the main reactor (). The invention further relates to a device for carrying out said method.

Method for the production of polyether carbonate polyols and device therefor

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: (&#x3b1;) optionally, pre-treating the double metal cyanide catalyst (DMC catalyst) at a temperature of 50 to 200&#xb0; C. and/or reduced pressure (absolute) of 10 mbar to 800 mbar; (&#x3b2;) bringing the double metal cyanide catalyst in contact with suspension means, and furthermore, with alkylene oxide in the first reactor thus obtaining a first reaction mixture, and (&#x3b3;) 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 (&#x3b2;) or (&#x3b3;), at least one h-functional starter compound is used, and wherein reaction products formed in step (&#x3b3;) are continuously removed from the second reactor.

The invention relates to a process for producing polyether carbonate polyols through an addition reaction of alkylene oxides and carbon dioxide onto one or more H-functional starter substances in the presence of a double metal cyanide catalyst or in the presence of a metal complex catalyst based on the metals zinc and/or cobalt, characterized in that one or more H-functional starter substances containing at least 1000 ppm of component (K) is/are continuously metered into the reactor during the reaction, where component (K) is selected from at least one compound containing a phosphorus-oxygen bond and a phosphorus compound that can form one or more P&#x2014;O bonds through reaction with OH-functional compounds.

The invention relates to a method for producing polyether carbonate polyols by attaching alkylene oxides and carbon dioxide to one or more H-functional starters in the presence of a double-metal cyanide catalyst, characterized in that (alpha) a suspending agent which contains no H-functional groups is provided in a reactor, (ss) optionally, a moiety of alkylene oxide is added to the mixture from step (alpha) at temperatures of 90 to 150 DEG C., and the addition of the alkylene oxide compound is then interrupted; and (gamma) one or more H-functional starters are continuously metered into the reactor during the reaction.

Polyether carbonate polyol production method

The invention relates to a method for producing polyether carbonate polyols by attaching alkylene oxides and carbon dioxide to one or more H-functional starters in the presence of a double-metal cyanide catalyst, characterized in that (alpha) a suspending agent which contains no H-functional groups and is selected from among one or more compounds from the group consisting of aliphatic lactones, aromatic lactones, lactides, cyclic carbonates comprising at least three optionally substituted methylene groups between the oxygen atoms of the carbonate group, aliphatic cyclic anhydrides, and aromatic cyclic anhydrides, is provided in a reactor; (ss) optionally, a moiety of alkylene oxide is added to the mixture from step (alpha) at temperatures of 90 to 150 DEG C., and the addition of the alkylene oxide compound is then interrupted; and (gamma) one or more H-functional starters are continuously metered into the reactor during the reaction.

The present invention relates to a process for the activation of double metal cyanide (DMC) catalysts and to a process for the preparation of polyethercarbonate polyols from one or more H-functional starter compounds, one or more alkylene oxides and carbon dioxide in the presence of a double metal cyanide catalyst, characterized in that

Method for activating double metal cyanide catalysts for producing polyether polyols

The present invention relates to a process for the preparation of polyether carbonate polyols from one or more H-functional starter compounds, one or more alkylene oxides and carbon dioxide in the presence of a double metal cyanide catalyst, wherein (&#x3b1;) the H-functional starter substance or a mixture of at least two H-functional starter substances is initially introduced into the reaction vessel, (&#x3b2;) for the activation, a part amount (based on the total amount of the amount of alkylene oxides employed in steps (&#x3b2;) and (&#x3b3;)) of one or more alkylene oxides is added to the mixture resulting from step (&#x3b1;), it also being possible for step (&#x3b2;) to be carried out several times for the activation, (&#x3b3;) one or more alkylene oxides and carbon dioxide are metered continuously into the mixture resulting from step (&#x3b2;) ('copolymerization'), the alkylene oxides employed for the copolymerization being identical to or different from the alkylene oxides employed in step (&#x3b2;), characterized in that in step (&#x3b3;) the carbon dioxide is passed into the mixture by (i) gassing the reaction mixture in the reactor from the bottom, (ii) using a hollow shaft stirrer, (iii) a combination of the metering operations according to (i) and (ii), and/or (iv) gassing over the surface of the liquid by using stirrer units configured in several stages.

Method for producing polyether polyols

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Dormagen, Germany

Matthias Wohak