Covestro Deutschland Ag

Covestro Intellectual Property Gmbh & Co. Kg

Stefanie Braun

Jörg Hofmann

Aurel Wolf

Matthias Wohak

Kai Laemmerhold

Michael Traving

Christoph Gürtler

Hartmut Nefzger

Thomas Ernst Müller

Hans-Georg Pirkl

Rolf Bachmann

Jens Langanke

Urs Rauwald

Ilja Peckermann

Horst Zwick

Thomas Runowski

Cyrus Ahmadzade-Youssefi

Werner Bäcker

Lars Krueger

Nicole Welsch

Jürgen Bausa

Maria Francisco Casal

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 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 binding alkylene oxides and carbon dioxide to one or more H-functional starter substance/s in the presence of a double metal cyanide (DMC) catalyst, characterized in that (y) one or more H-functional starter substance/s and DMC catalyst are continuously metered into the reactor during the binding process, and the free alkylene oxide concentration in the reaction mixture amounts to 1.5 to 5.0 wt %, and the obtained reaction mixture is continuously discharged from the reactor.

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

Growing community of inventors

Kö'ln, Germany

Stefanie Braun