Patents by Inventor Stefan Drees
Stefan Drees has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11820739Abstract: A process for preparing aldehydes by a homogeneously catalysed hydroformylation of C4 to C20 olefins involves withdrawing a biphasic stream (liquid/gaseous) and expanding in two stages. Before, between, or after the two stages, the liquid phase is cooled. Only after expansion and cooling is the homogeneously dissolved rhodium catalyst system separated from the residual stream.Type: GrantFiled: November 15, 2022Date of Patent: November 21, 2023Assignee: Evonik Operations GmbHInventors: Ana Markovic, Frank Geilen, Alexander Brächer, Benedikt Dercks, Stefan Drees, Tonia Weber, Robert Franke, Dirk Fridag
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Patent number: 11806669Abstract: The invention provides an improvement in terms of control and process technology for a method of continuous removal of a component from a liquid mixture using a membrane unit comprising at least one membrane stage. The improvement is that a portion of the overall permeate stream is recycled to the feed vessel and/or beyond the feed vessel but upstream of the conveying device, and the remainder of the overall permeate stream is removed, with the recycled permeate having a higher concentration of the component to be separated off than the removed permeate. The presently disclosed method can especially be used for separation of a homogeneously dissolved catalyst from a liquid reaction mixture.Type: GrantFiled: December 13, 2021Date of Patent: November 7, 2023Assignee: Evonik Operations GmbHInventors: Frederik Gluth, Marc Schäpertöns, Thomas Quell, Frank Geilen, Stefan Drees, Fabian Höckelmann, Robert Franke
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Patent number: 11773041Abstract: A process for preparing aldehydes by a homogeneously catalyzed hydroformylation of C4 to C20 olefins involves withdrawing a biphasic stream (liquid/gaseous) and expanding in two stages. Before, between, or after the two stages, the liquid phase is cooled. Only after expansion and cooling is the homogeneously dissolved rhodium catalyst system separated from the residual stream in a three-stage removal.Type: GrantFiled: November 16, 2022Date of Patent: October 3, 2023Assignee: Evonik Operations GmbHInventors: Frank Geilen, Alexander Brächer, Stefan Drees, Benedikt Dereks, Robert Franke, Ana Markovic, Armin Matthias Rix, Martin Oldemeyer, Dirk Fridag
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Publication number: 20230159423Abstract: A process for preparing aldehydes by a homogeneously catalysed hydroformylation of C4 to C20 olefins involves withdrawing a biphasic stream (liquid/gaseous) and expanding in two stages. Before, between, or after the two stages, the liquid phase is cooled. Only after expansion and cooling is the homogeneously dissolved rhodium catalyst system separated from the residual stream.Type: ApplicationFiled: November 15, 2022Publication date: May 25, 2023Applicant: Evonik Operations GmbHInventors: Ana MARKOVIC, Frank Geilen, Alexander Brächer, Benedikt Dercks, Stefan Drees, Tonia Weber, Robert Franke, Dirk Fridag
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Publication number: 20230159425Abstract: A process for preparing aldehydes by a homogeneously catalyzed hydroformylation of C4 to C20 olefins involves withdrawing a biphasic stream (liquid/gaseous) and expanding in two stages. Before, between, or after the two stages, the liquid phase is cooled. Only after expansion and cooling is the homogeneously dissolved rhodium catalyst system separated from the residual stream in a three-stage removal.Type: ApplicationFiled: November 16, 2022Publication date: May 25, 2023Applicant: Evonik Operations GmbHInventors: Frank Geilen, Alexander Brächer, Stefan Drees, Benedikt Dercks, Robert Franke, Ana Markovic, Armin Matthias Rix, Martin Oldemeyer, Dirk Fridag
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Publication number: 20220193611Abstract: The invention provides an improvement in terms of control and process technology for a method of continuous removal of a component from a liquid mixture using a membrane unit comprising at least one membrane stage. The improvement is that a portion of the overall permeate stream is recycled to the feed vessel and/or beyond the feed vessel but upstream of the conveying device, and the remainder of the overall permeate stream is removed, with the recycled permeate having a higher concentration of the component to be separated off than the removed permeate. The presently disclosed method can especially be used for separation of a homogeneously dissolved catalyst from a liquid reaction mixture.Type: ApplicationFiled: December 13, 2021Publication date: June 23, 2022Applicant: Evonik Operations GmbHInventors: Frederik Gluth, Marc Schäpertöns, Thomas Quell, Frank Geilen, Stefan Drees, Fabian Höckelmann, Robert Franke
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Publication number: 20220193609Abstract: The invention provides an improvement in terms of control and process technology for a method of continuous removal of a component from a liquid mixture using a membrane unit comprising at least one membrane stage. The improvement is that at least some of the overall permeate stream obtained is recycled to the feed vessel and/or beyond the feed vessel but upstream of the conveying device. The presently disclosed method can especially be used for separation of a homogeneously dissolved catalyst from a liquid reaction mixture.Type: ApplicationFiled: December 13, 2021Publication date: June 23, 2022Applicant: Evonik Operations GmbHInventors: Thomas Quell, Johannes Knossalla, Robert Franke, Stefan Drees, Frederik Gluth, Marc Schäpertöns, Fabian Höckelmann
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Patent number: 8138379Abstract: The invention relates to a one-stage continuous process for hydroformylating olefins having at least 5 carbon atoms to the corresponding aldehydes and/or alcohols having at least 6 carbon atoms in the presence of unmodified cobalt catalysts in a process in which, in the presence of an aqueous phase and of an organic phase, catalyst formation, catalyst extraction and hydroformylation proceed in the same reactor, which is characterized in that more aqueous cobalt salt solution is fed into the reactor as an aqueous phase with the liquid reaction mixture and is discharged from the reactor with the gas phase, and in that the level of the aqueous bottom phase is kept constant by continuously conducting a portion of the aqueous bottom phase out of the reactor.Type: GrantFiled: October 28, 2008Date of Patent: March 20, 2012Assignee: Evonik Oxeno GmbHInventors: Hans-Gerd Lueken, Stefan Drees, Alfred Kaizik, Wilfried Bueschken
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Patent number: 8129571Abstract: The invention relates to a process for the continuous preparation of aldehydes and/or alcohols having at least 6 carbon atoms by multistage hydroformylation of olefins or olefin mixtures having at least 5 carbon atoms in the presence of unmodified cobalt complexes, in which at least two reactors are operated at different temperatures in the temperature range from 100 to 220° C. and pressures of from 100 to 400 bar, which is characterized in that a) one reactor is operated at temperatures above 160° C.Type: GrantFiled: October 28, 2008Date of Patent: March 6, 2012Assignee: Evonik Oxeno GmbHInventors: Hans-Gerd Lueken, Alfred Kaizik, Stefan Drees, Wilfried Bueschken
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Publication number: 20100249464Abstract: The invention relates to a one-stage continuous process for hydroformylating olefins having at least 5 carbon atoms to the corresponding aldehydes and/or alcohols having at least 6 carbon atoms in the presence of unmodified cobalt catalysts in a process in which, in the presence of an aqueous phase and of an organic phase, catalyst formation, catalyst extraction and hydroformylation proceed in the same reactor, which is characterized in that more aqueous cobalt salt solution is fed into the reactor as an aqueous phase with the liquid reaction mixture and is discharged from the reactor with the gas phase, and in that the level of the aqueous bottom phase is kept constant by continuously conducting a portion of the aqueous bottom phase out of the reactor.Type: ApplicationFiled: October 28, 2008Publication date: September 30, 2010Applicant: Evonik Oxeno GmbHInventors: Hans-Gerd Lueken, Stefan Drees, Alfred Kaizik, Wilfried Bueschken
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Publication number: 20100210880Abstract: The invention relates to a process for the continuous preparation of aldehydes and/or alcohols having at least 6 carbon atoms by multistage hydroformylation of olefins or olefin mixtures having at least 5 carbon atoms in the presence of unmodified cobalt complexes, in which at least two reactors are operated at different temperatures in the temperature range from 100 to 220° C. and pressures of from 100 to 400 bar, which is characterized in that a) one reactor is operated at temperatures above 160° C.Type: ApplicationFiled: October 28, 2008Publication date: August 19, 2010Applicant: Evonik Oxeno GmbHInventors: Hans-Gerd Lueken, Alfred Kaizik, Stefan Drees, Wilfried Bueschken
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Patent number: 7179947Abstract: A process for the catalytic hydroformylation of olefins having from 6 to 24 carbon atoms, in which the hydroformylation is carried out in one or more stage(s) and a mixture comprising at least one olefin and an aldehyde in a molar ratio of aldehyde to olefin of from 0.005:1 to 0.2:1 is used as feed in at least one of these stages which is carried out in the presence of an unmodified cobalt complex as catalyst.Type: GrantFiled: December 2, 2005Date of Patent: February 20, 2007Assignee: Oxeno Olefinchemie GmbHInventors: Hans-Gerd Lueken, Alfred Kaizik, Stefan Drees, Wilfried Bueschken, Wilhelm Droste
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Publication number: 20060128998Abstract: A process for the catalytic hydroformylation of olefins having from 6 to 24 carbon atoms, in which the hydroformylation is carried out in one or more stage(s) and a mixture comprising at least one olefin and an aldehyde in a molar ratio of aldehyde to olefin of from 0.005:1 to 0.2:1 is used as feed in at least one of these stages which is carried out in the presence of an unmodified cobalt complex as catalyst.Type: ApplicationFiled: December 2, 2005Publication date: June 15, 2006Applicant: DEGUSSA AGInventors: Hans-Gerd Lueken, Alfred Kaizik, Stefan Drees, Wilfried Bueschken, Wilhelm Droste
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Patent number: 6720457Abstract: Olefins having from 5 to 24, in particular from 5 to 12, carbon atoms are hydroformylated by reacting an olefin or a mixture of olefins in the presence of an unmodified cobalt catalyst in a single-stage process in a reactor at a temperature of from 100° C. to 220° C. and a pressure of from 100 bar to 400 bar, to obtain an aldehyde, an alcohol or a mixture thereof. An aqueous bottom phase and an organic phase are present in the reactor, the aqueous bottom phase is mixed with the organic phase, and a concentration of the cobalt catalyst, calculated as metallic cobalt, in the aqueous bottom phase is in the range from 0.4 to 1.7% by mass based on the total weight of the aqueous bottom phase. A level of the aqueous bottom phase in the reactor is kept constant during steady-state operation.Type: GrantFiled: July 24, 2002Date of Patent: April 13, 2004Assignee: Oxeno Olefinchemie GmbHInventors: Stefan Drees, Bernhard Scholz, Alfred Kaizik, Walter Toetsch, Wilfried Bueschken, Martin Trocha
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Publication number: 20030032843Abstract: Olefins having from 5 to 24, in particular from 5 to 12, carbon atoms are hydroformylated by reacting an olefin or a mixture of olefins in the presence of an unmodified cobalt catalyst in a single-stage process in a reactor at a temperature of from 100° C. to 220° C. and a pressure of from 100 bar to 400 bar, to obtain an aldehyde, an alcohol or a mixture thereof. An aqueous bottom phase and an organic phase are present in the reactor, the aqueous bottom phase is mixed with the organic phase, and a concentration of the cobalt catalyst, calculated as metallic cobalt, in the aqueous bottom phase is in the range from 0.4 to 1.7% by mass based on the total weight of the aqueous bottom phase. A level of the aqueous bottom phase in the reactor is kept constant during steady-state operation.Type: ApplicationFiled: July 24, 2002Publication date: February 13, 2003Applicant: OXENO OLEFINCHEMIE GMBHInventors: Stefan Drees, Bernhard Scholz, Alfred Kaizik, Walter Toetsch, Wilfried Bueschken, Martin Trocha