Patents by Inventor Juergen Herwig
Juergen Herwig 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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Publication number: 20080249300Abstract: The invention relates to a method for the coammoxidation, i.e. for the simultaneous ammoxidation of ketones, especially of cyclic ketones such as cyclododecanone and cyclohexanone. The ammoxidatian method of the invention relates to the production of oximes from ketones or aldehydes using hydrogen peroxide and amnmonia and further using a catalyst that substantially consists of silicon, titanium and oxygen, such as for example titanium silicalite.Type: ApplicationFiled: August 2, 2004Publication date: October 9, 2008Applicant: Degussa AGInventors: Juergen Herwig, Martin Roos, Georg Oenbrink, Bernd Guenzel, Dirk Kuppert
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Patent number: 7253329Abstract: A process for preparing cyclododecene by selective gas-phase hydrogenation of at least one starting material selected from cyclododecatriene, cyclododecadiene and mixtures thereof, wherein the starting material present in the gas phase is hydrogenated in the presence of a catalyst in a fixed-bed reactor and the Bodenstein number for the process is greater than 100.Type: GrantFiled: March 2, 2004Date of Patent: August 7, 2007Assignee: Degussa AGInventors: Juergen Herwig, Norbert Wilczok, Martin Roos, Rudolf Burghardt, Johann Gaube, Georg Oenbrink, Bernd Guenzel
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Patent number: 7084300Abstract: Degradation acids obtained in the synthesis of carboxylic acids, in particular dicarboxylic acids, having from 8 to 16 carbon atoms may be isolated by separating the degradation acids in the form of a solid from the crude reaction mixture, then washing the degradation acids in the form of an oil with water at an elevated temperature. The resulting degradation acids having low oxidant and metal contents, and the metal catalyst may be recirculated back to the process.Type: GrantFiled: April 11, 2003Date of Patent: August 1, 2006Assignee: Degussa AGInventors: Juergen Herwig, Ralf Richter, Martin Roos, Georg Oenbrink
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Patent number: 6927308Abstract: An oxime is synthesized by ammoximation of a carbonyl compound. In stage (i) of the process, a carbonyl compound containing 6 to 20 C atoms is reacted with ammonia and hydrogen peroxide in the presence of a) an organic solvent that is a1) at least partly water-soluble, a2) stable under ammoximation conditions, a3) has a boiling point of higher than 100° C. and/or is capable of forming a two-phase azeotrope with water, and b) a titanium-containing heterogeneous catalyst. After the reaction, the catalyst is separated from the reaction mixture. The oxime is crystallized and separated from the reaction mixture. Water is removed from the remaining mother liquor, provided the mother liquor is a two-phase system in which one of the phases is an aqueous phase. Water or a water-containing two-phase azeotrope is distilled off from the mother liquor, while the distillation bottoms and, optionally, the predominantly organic phase of the azeotrope are recycled to stage (i).Type: GrantFiled: December 12, 2003Date of Patent: August 9, 2005Assignee: Degussa AGInventors: Stefan Leininger, Juergen Herwig, Martin Roos, Georg Oenbrink
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Patent number: 6861540Abstract: The epoxidation of cyclic, at least monounsaturated alkenes is conducted by a process, which comprises conducting the epoxidation of a cyclic, at least monounsaturated alkene in the presence of an oxidant in a reaction medium that contains at least 1% by weight of the saturated cyclic alkane corresponding to the cyclic, at least monounsaturated alkene. In a preferred embodiment the reaction medium contains at least 2.5% by weight of the saturated cyclic alkane corresponding to the cyclic, at least monounsaturated alkene.Type: GrantFiled: October 14, 2003Date of Patent: March 1, 2005Assignee: Degussa AGInventors: Jürgen Herwig, Martin Roos, Georg Oenbrink, Bernd Günzel, Jörg Lohmar
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Patent number: 6828449Abstract: Settling times of a catalyst in the epoxidation of a cyclic, at least monounsaturated alkene are improved by a method, comprising epoxidizing a cyclic, at least monounsaturated alkene having from 8 to 20 carbon atoms in the ring in a reaction medium containing an oxidant and a catalyst system comprising at least one metal of Groups 4, 5 and 6 of the Periodic Table of the Elements, phosphoric acid and a phase transfer catalyst and a cyclic alkane having from 8 to 20 carbon atoms in the ring, which corresponds to the alkene reactant, as settling accelerator in the epoxidation reaction.Type: GrantFiled: October 9, 2003Date of Patent: December 7, 2004Assignee: Degussa AGInventors: Juergen Herwig, Martin Roos, Georg Oenbrink, Bernd Guenzel, Joerg Lohmar
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Publication number: 20040225168Abstract: A process for preparing cyclododecene by selective gas-phase hydrogenation of at least one starting material selected from cyclododecatriene, cyclododecadiene and mixtures thereof, wherein the starting material present in the gas phase is hydrogenated in the presence of a catalyst in a fixed-bed reactor and the Bodenstein number for the process is greater than 100.Type: ApplicationFiled: March 2, 2004Publication date: November 11, 2004Applicant: DEGUSSA AGInventors: Juergen Herwig, Norbert Wilczok, Martin Roos, Rudolf Burghardt, Johann Gaube, Georg Oenbrink, Bernd Guenzel
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Publication number: 20040167359Abstract: An oxime is synthesized by ammoximation of a carbonyl compound. In stage (i) of the process, a carbonyl compound containing 6 to 20 C atoms is reacted with ammonia and hydrogen peroxide in the presence of a) an organic solvent that is a1) at least partly water-soluble, a2) stable under ammoximation conditions, a3) has a boiling point of higher than 100° C. and/or is capable of forming a two-phase azeotrope with water, and b) a titanium-containing heterogeneous catalyst. After the reaction, the catalyst is separated from the reaction mixture. The oxime is crystallized and separated from the reaction mixture. Water is removed from the remaining mother liquor, provided the mother liquor is a two-phase system in which one of the phases is an aqueous phase. Water or a water-containing two-phase azeotrope is distilled off from the mother liquor, while the distillation bottoms and, optionally, the predominantly organic phase of the azeotrope are recycled to stage (i).Type: ApplicationFiled: December 12, 2003Publication date: August 26, 2004Applicant: DEGUSA AGInventors: Stefan Leininger, Juergen Herwig, Martin Roos, Georg Oenbrink
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Publication number: 20040073051Abstract: Settling times of a catalyst in the epoxidation of a cyclic, at least monounsaturated alkene are improved by a method, comprising epoxidizing a cyclic, at least monounsaturated alkene having from 8 to 20 carbon atoms in the ring in a reaction medium containing an oxidant and a catalyst system comprising at least one metal of Groups 4, 5 and 6 of the Periodic Table of the Elements, phosphoric acid and a phase transfer catalyst and a cyclic alkane having from 8 to 20 carbon atoms in the ring, which corresponds to the alkene reactant, as settling accelerator in the epoxidation reaction.Type: ApplicationFiled: October 9, 2003Publication date: April 15, 2004Applicant: DEGUSSA AGInventors: Juergen Herwig, Martin Roos, Georg Oenbrink, Bernd Guenzel, Joerg Lohmar
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Patent number: 6664423Abstract: Oximes are prepared from ketones or aldehydes, hydrogen peroxide and ammonia. The reaction is carried out in a system of one aqueous phase and one phase of hydrocarbons inert under the reaction conditions in the presence of at least one interphase contactor and a catalyst system which consists of at least two components. A first component of the catalyst system is present in heterogeneous form and is based on titanium, silicon and oxygen and a second component is a homogeneously dissolved or suspended ammonium salt.Type: GrantFiled: November 14, 2002Date of Patent: December 16, 2003Assignee: Degussa AGInventors: Juergen Herwig, Stefan Leininger, Georg Oenbrink, Thomas Schiffer
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Publication number: 20030100795Abstract: Oximes are prepared from ketones or aldehydes, hydrogen peroxide and ammonia. The reaction is carried out in a system of one aqueous phase and one phase of hydrocarbons inert under the reaction conditions in the presence of at least one interphase contactor and a catalyst system which consists of at least two components. A first component of the catalyst system is present in heterogeneous form and is based on titanium, silicon and oxygen and a second component is a homogeneously dissolved or suspended ammonium salt.Type: ApplicationFiled: November 14, 2002Publication date: May 29, 2003Applicant: Degussa AGInventors: Juergen Herwig, Stefan Leininger, Georg Oenbrink, Thomas Schiffer
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Patent number: 6313297Abstract: A process for preparing a 1-aryl-4-(arylethyl)piperazine of the formula (I) by reacting a 1-arylpiperazine of the formula (II) with an aromatic olefin of the formula (III) Ar′CR1═CHR2 (III) in an inert solvent in the presence of at least one basic catalyst, where in the formulae (I) to (III) Ar and Ar′ independently of one another are an aryl radical, selected from the group of the fused and unfused C6-C22-aromatics and the fused or unfused C5-C22-heteroaromatics which have at least one nitrogen, oxygen or sulfur atom in the ring; and R1 and R2 independently of one another are a hydrogen atom, a C1-C8-alkyl radical or an aryl radical Ar.Type: GrantFiled: July 13, 2000Date of Patent: November 6, 2001Assignees: Aventis Research & Technologies, GmbH & Co. KGInventors: Jürgen Herwig, Matthias Beller, Claudia Breindl
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Patent number: 6222073Abstract: Process for the preparation of an N-arylethylaniline of the formula (I) Ar—N(R1)2-n(CHR2CHR3Ar′)n (I) by reacting an aromatic olefin of the formula (II) Ar′CR3=CHR2 (II) with an aniline of the formula (III) Ar—N(R1)2-n(H)n (III) in an inert solvent in the presence of at least one basic catalyst selected from the group consisting of alkali metal alcoholates and alkaline earth metal alcoholates or alkali metal amides and alkaline earth metal amides, where, in the formulae (I) to (III), Ar and Ar′, independently of one another, are an aryl radical selected from the group consisting of the fused and nonfused C6-C22-aromatics and of the fused or nonfused C5-C22heteroaromatics which have at least one nitrogen, oxygen or sulfur atom in the ring; R1, R2 and R3, independently of one another, are a hydrogen atom, a C1-C8-alkyl radical or an aryl radical Ar; and n is the number 1 or 2.Type: GrantFiled: July 3, 2000Date of Patent: April 24, 2001Assignee: Aventis Research & Technologies GmbH & Co. KGInventors: Jürgen Herwig, Matthias Beller, Claudia Breindl, Harald Trauthwein, Elisabeth Eichberger, Anton Eichberger