Patents by Inventor Hermann Siegert
Hermann Siegert 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: 9289752Abstract: The present invention relates to a catalyst for reacting carbonitriles with water, wherein the catalyst comprises at least 60% by weight of manganese dioxide with an empirical formula MnOx where x is in the range from 1.7 to 2.0, and at least one plasticizer. The present invention further relates to a process for preparing the catalysts detailed above and to a process for preparing carboxamides by reacting carbonitriles with water in the presence of the present catalyst.Type: GrantFiled: February 26, 2009Date of Patent: March 22, 2016Assignee: Evonik Röhm GmbHInventors: Alexander May, Bernd Vogel, Hermann Siegert, Kurt-Alfred Gaudschun, Thomas Quandt
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Patent number: 9234218Abstract: The present invention relates to a process for the preparation of methacrylic acid or methacrylic esters, comprising the process steps of IA) preparation of 3-hydroxyisobutyric acid by a process comprising the process step of bringing a cell which has been genetically modified in comparison with its wild type in such a way that it is capable of forming more 3-hydroxyisobutyric acid, or polyhydroxyalkanoates based on 3-hydroxyisobutyric acid in comparison with its wild type, into contact with a nutrient medium comprising, as carbon source, carbohydrates, glycerol, carbon dioxide, methanol, L-valine or L-glutamate under conditions under which 3-hydroxyisobutyric acid or polyhydroxyalkanoates based on 3-hydroxyisobutyric acid are formed from the carbon source, if appropriate, isolation of the 3-hydroxyisobutyric acid from the nutrient medium and also, if appropriate, neutralization of the 3-hydroxyisobutyric acid, IB) dehydration of the 3-hydroxyisobutyric acid with formation of methacrylic acid and also, whereType: GrantFiled: May 30, 2008Date of Patent: January 12, 2016Assignee: EVONIK ROEHM GmbHInventors: Achim Marx, Markus Poetter, Stefan Buchholz, Alexander May, Hermann Siegert, Birgit Alber, Georg Fuchs, Lothar Eggeling
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Publication number: 20150218601Abstract: The present invention relates to a cell which has been modified in comparison with its wild type in such a way that it is capable of forming more, by comparison with its wild, 3-hydroxyisobutyric acid or polyhydroxyalkanoates based on 3-hydroxyisobutyric acid via methylmalonate-semialdehyde or 3-hydroxybutyryl-coenzyme A as precursors. The invention also relates to a method of generating a genetically modified cell, to the genetically modified cell obtainable by these methods, to a method of producing 3-hydroxyisobutyric acid or polyhydroxyalkanoates based on 3-hydroxyisobutyric acid, to a method of producing methacrylic acid or methacrylic esters, and to a method of producing polymethacrylic acid or polymethacrylic esters. The present invention furthermore relates to an isolated DNA, to a vector, to the use of this vector for transforming a cell, to a transformed cell, and to a polypeptide.Type: ApplicationFiled: February 18, 2015Publication date: August 6, 2015Applicant: EVONIK ROEHM GMBHInventors: Achim MARX, Markus Poetter, Stefan Buchholz, Alexander May, Hermann Siegert, Georg Fuchs, Birgit Alber, Lothar Eggeling
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Patent number: 8975440Abstract: The invention relates to a method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid, comprising the steps of A) reacting a carbonyl compound with hydrocyanic acid to produce a hydroxycarboxylic acid nitrile, B) hydrolysis of the hydroxycarboxylic acid nitrile obtained in step A) in the presence of a catalyst comprising manganese dioxide, wherein a molar excess of carbonyl compound is used in relation to the hydrocyanic acid to react the carbonyl compound with hydrocyanic acid according to step A), and the reaction mixture obtained in step A) is not purified by distillation before the hydrolysis according to step B) is carried out. The invention furthermore relates to a method for producing alkyl(meth)acrylates from polymers, moulding compounds and moulded bodies, wherein a method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid is carried out in accordance with the method described above.Type: GrantFiled: October 29, 2009Date of Patent: March 10, 2015Assignee: Evonik Roehm GmbHInventors: Alexander May, Martin Koestner, Joerg Becker, Joerg Schallenberg, Hermann Siegert, Bernd Vogel
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Patent number: 8889899Abstract: The present invention relates to processes for transesterification, comprising the steps of A) mixing an organic acid a) with an ester b) and B) transferring the alcohol radical of the ester b) to the acid a) to obtain the ester of the acid a) and the acid of the ester b), step B) being carried out in a still.Type: GrantFiled: May 12, 2006Date of Patent: November 18, 2014Assignee: Evonik Roehm GmbHInventors: Jochen Ackermann, Alexander May, Udo Gropp, Hermann Siegert, Bernd Vogel, Soenke Broecker
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Patent number: 8791296Abstract: The present invention relates to a process for preparing methacrylic acid based on the hydrolysis of methacrylic esters.Type: GrantFiled: April 24, 2012Date of Patent: July 29, 2014Assignee: Evonik Roehm GmbHInventors: Dirk Broell, Hermann Siegert, Horst Hiltner, Thomas Krauss
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Publication number: 20140051886Abstract: The present invention relates to a process for preparing methacrylic acid based on the hydrolysis of methacrylic esters.Type: ApplicationFiled: April 24, 2012Publication date: February 20, 2014Applicant: EVONIK RÖHM GmbHInventors: Dirk Broell, Hermann Siegert, Horst Hiltner, Thomas Krauss
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Patent number: 8569539Abstract: Alpha-hydroxycarboxylic esters are prepared by a continuous process in which alpha-hydroxycarboxamide is reacted with an alcohol in the presence of a catalyst to obtain a product mixture which contains alpha-hydroxycarboxylic ester, ammonia, unconverted alpha-hydroxycarboxamide and alcohol, and catalyst; wherein reactant streams containing an alpha-hydroxycarboxamide, an alcohol and a catalyst are fed into a pressure reactor. The reactant streams are reacted with one another in the pressure reactor at a pressure in the range of 1 bar to 100 bar; and the product mixture is depleted in alcohol and ammonia by distilling off ammonia at a pressure which is constantly kept greater than 1 bar without the aid of additional stripping media. The continuous process can be employed particularly advantageously on the industrial scale.Type: GrantFiled: March 28, 2007Date of Patent: October 29, 2013Assignee: Evonik Roehm GmbHInventors: Alexander May, Bernd Vogel, Hermann Siegert, Jochen Ackermann, Soenke Broecker
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Patent number: 8461375Abstract: The invention relates to an improved method for the continuous production of alkyl(methyl)acrylates by transesterification of methyl(meth)acrylate with alcohols that are heavy in comparison with methanol. A special processing technique makes it possible to obtain new levels of product quality. Very high space-time-overall yields can also be obtained. The invention is characterized by the multiple use of a homogeneous catalyst which thereby reduces the costs of auxiliary agents significantly.Type: GrantFiled: November 21, 2003Date of Patent: June 11, 2013Assignee: Evonik Röhm GmbHInventors: Jochen Ackerman, Horst Hiltner, Hermann Siegert
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Patent number: 8337671Abstract: Process for distillatively purifying polymerizable compounds using a high-boiling, inert, thermally long-term-stable substance as a boiling oil, characterized in that the boiling oil is disposed in the bottom of a rectification column.Type: GrantFiled: March 14, 2007Date of Patent: December 25, 2012Assignee: Evonik Röhm GmbHInventors: Dirk Broell, Hermann Siegert
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Patent number: 8334406Abstract: The present invention relates to a process for preparing carboxamides by hydrolysing carbonitriles in the presence of a catalyst comprising manganese dioxide, wherein the reaction mixture added to the catalyst comprising manganese dioxide has a pH in the range of 6.0 to 11.0 and the hydrolysis is performed in the presence of an oxidizing agent. The present invention further relates to a process for preparing alkyl (meth)acrylates, the process having a hydrolysis step according to the process described above.Type: GrantFiled: August 30, 2007Date of Patent: December 18, 2012Assignee: Evonik Roehm GmbHInventors: Alexander May, Jochen Ackermann, Hermann Siegert, Bernd Vogel, Soenke Broecker
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Publication number: 20120232305Abstract: The invention relates to a method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid, comprising the steps of A) reacting a carbonyl compound with hydrocyanic acid to produce a hydroxycarboxylic acid nitrile, B) hydrolysis of the hydroxycarboxylic acid nitrile obtained in step A) in the presence of a catalyst comprising manganese dioxide, wherein a molar excess of carbonyl compound is used in relation to the hydrocyanic acid to react the carbonyl compound with hydrocyanic acid according to step A), and the reaction mixture obtained in step A) is not purified by distillation before the hydrolysis according to step B) is carried out. The invention furthermore relates to a method for producing alkyl(meth)acrylates from polymers, moulding compounds and moulded bodies, wherein a method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid is carried out in accordance with the method described above.Type: ApplicationFiled: October 29, 2009Publication date: September 13, 2012Applicant: EVONIK ROEHM GmbHInventors: Alexander MAY, Martin KOESTNER, Joerg BECKER, Joerg SCHALLENBERG, Hermann SIEGERT, Bernd VOGEL
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Patent number: 8207371Abstract: The present invention relates to a process for preparing (meth)acrylic acid, characterized in that a cyclic ester is converted to (meth)acrylic acid in the presence of a catalyst. The (meth)acrylic acid prepared can in particular be converted to (meth)acrylates.Type: GrantFiled: August 30, 2007Date of Patent: June 26, 2012Assignee: Evonik Röhm GmbHInventors: Bernd Vogel, Alexander May, Hermann Siegert
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Patent number: 8084640Abstract: Process for continuously preparing unsaturated carboxylic anhydrides of the general formula I R—C(O)—O—C(O)—R??(I) in which R is an unsaturated organic radical having 2 to 12 carbon atoms by transanhydridization of an aliphatic carboxylic anhydride with a carboxylic acid of the general formula II R—COOH??(II) in which R is as defined above in a rectification column having an upper, middle and lower region, characterized in that f) an inert boiling oil is initially charged in the bottom of the column, g) the reactants are fed into a reaction region in stoichiometric ratios, h) the carboxylic acid formed as the by-product is withdrawn at the top of the column, i) the unconverted reactants are recycled into the reaction region and j) the product of the formula I is obtained via a side draw, preferably between the middle and lower column region.Type: GrantFiled: March 14, 2007Date of Patent: December 27, 2011Assignee: EVONIK ROEHM GmbHInventors: Dirk Broell, Hermann Siegert
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Publication number: 20110306784Abstract: The invention relates to a method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid, comprising the steps of A) reacting a carbonyl compound with hydrocyanic acid to produce a hydroxycarboxylic acid nitrile, B) hydrolysis of the hydroxycarboxylic acid nitrile obtained in step A) in the presence of a catalyst comprising manganese dioxide, wherein a molar excess of carbonyl compound is used in relation to the hydrocyanic acid to react the carbonyl compound with hydrocyanic acid according to step A), and the reaction mixture obtained in step A) is not purified by distillation before the hydrolysis according to step B) is carried out. The invention furthermore relates to a method for producing alkyl(meth)acrylates from polymers, moulding compounds and moulded bodies, wherein a method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid is carried out in accordance with the method described above.Type: ApplicationFiled: October 29, 2009Publication date: December 15, 2011Applicant: EVONIK ROEHM GMBHInventors: Alexander May, Martin Koestner, Joerg Becker, Joerg Schallenberg, Hermann Siegert, Bernd Vogel
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Patent number: 7999130Abstract: The present invention relates to processes for preparing alkyl (meth)acrylates, comprising the steps of transesterifying an alkyl ?-hydroxycarboxylate with (meth)acrylic acid to obtain alkyl (meth)acrylates and ?-hydroxycarboxylic acid, and dehydrating the ?-hydroxycarboxylic acid to obtain (meth)acrylic acid.Type: GrantFiled: May 12, 2006Date of Patent: August 16, 2011Assignee: Evonik Roehm GmbHInventors: Jochen Ackermann, Alexander May, Udo Gropp, Hermann Siegert, Bernd Vogel, Soenke Broecker
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Patent number: 7928251Abstract: The present invention relates to a process for preparing tetramethylglycolide by heating a composition which comprises at least 50% by weight of 2-hydroxy-isobutyric acid and/or tetramethylglycolide to a temperature of at least 100° C.Type: GrantFiled: August 30, 2007Date of Patent: April 19, 2011Assignee: Evonik Roehm GmbHInventors: Bernd Vogel, Alexander May, Hermann Siegert
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Publication number: 20110060159Abstract: The present invention relates to a process for preparing carboxamides by hydrolysing carbonitriles in the presence of a catalyst comprising manganese dioxide, wherein the reaction mixture added to the catalyst comprising manganese dioxide has a pH in the range of 6.0 to 11.0 and the hydrolysis is performed in the presence of an oxidizing agent. The present invention further relates to a process for preparing alkyl (meth)acrylates, the process having a hydrolysis step according to the process described above.Type: ApplicationFiled: August 30, 2007Publication date: March 10, 2011Applicant: Evonik Roehm GmbHInventors: Alexander May, Jochen Ackermann, Hermann Siegert, Bernd Vogel, Soenke Broecker
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Publication number: 20110034728Abstract: The present invention relates to a catalyst for reacting carbonitriles with water, wherein the catalyst comprises at least 60% by weight of manganese dioxide with an empirical formula MnOx where x is in the range from 1.7 to 2.0, and at least one plasticizer. The present invention further relates to a process for preparing the catalysts detailed above and to a process for preparing carboxamides by reacting carbonitriles with water in the presence of the present catalyst.Type: ApplicationFiled: February 26, 2009Publication date: February 10, 2011Applicant: Evonik Roehm GmbHInventors: Alexander May, Bernd Vogel, Hermann Siegert, Kurt-Alfred Gaudschun, Thomas Quandt
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Publication number: 20110020207Abstract: The invention relates to a process for continuously preparing hydrogen cyanide by reacting ammonia with hydrocarbons, the reaction gas mixture being brought to reaction temperature in the fluidized bed by means of indirect heating by contact with a particulate heat transferrer, and which is characterized in that the heat transferrer is conducted cyclically in a transported fluidized bed, the heat transferrer being heated in an ascending transport stream and being contacted with the reaction gas mixture in a descending transport stream.Type: ApplicationFiled: June 5, 2009Publication date: January 27, 2011Applicant: Evonik Roehm GmbHInventor: Hermann Siegert