Patents by Inventor Tilman Sirch
Tilman Sirch 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: 20080207958Abstract: The present invention provides a process for preparing 1,6-hexanediol by hydrogenating dialkyl adipates, alkyl 6-hydroxycaproates, 1,4-cyclohexanedione and 4-hydroxycyclohexan-1-one as ester mixtures comprising impurities, by a) freeing resulting the esterification mixture of excess alcohol and low boilers in a first distillation stage (alcohol removal), b) carrying out a separation of the bottom product in a second distillation stage into an ester fraction substantially free of 1,4-cyclohexanediols and a fraction comprising at least the majority of the 1,4-cyclohexanediols, c) catalytically hydrogenating the ester fraction substantially free of 1,4-cyclohexanediols (ester hydrogenation) and d) in a purifying distillation stage, obtaining 1,6-hexanediol from the hydrogenation effluent in a manner known per se, which comprises selectively hydrogenating the ester mixture before stage a) and/or before stage b) (purifying hydrogenation).Type: ApplicationFiled: July 7, 2005Publication date: August 28, 2008Applicant: BASF AKTIENGESELLSCHAFTInventors: Andrea Haunert, Rolf Pinkos, Thomas Krug, Tilman Sirch, Michael Koch, Gerd-Dieter Tebben
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Patent number: 7388116Abstract: Process for the catalytic hydrogenation of methylolalkanals of the general formula where R1 and R2 are each, independently of one another, a further methylol group or an alkyl group having from 1 to 22 carbon atoms or an aryl or aralkyl group having from 6 to 33 carbon atoms, in the liquid phase by means of hydrogen over a hydrogenation catalyst, wherein hydrogen is used in a molar ratio to methylolalkanal of greater than 1.Type: GrantFiled: June 6, 2006Date of Patent: June 17, 2008Assignee: BASF AktiengesellschaftInventors: Steffen Maas, Thorsten Johann, Michael Koch, Tilman Sirch, Stephan Schlitter, Stefan Rittinger, Michael Steiniger, Todd C Spengeman
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Publication number: 20080004475Abstract: A process is provided for the preparation of polymethylol compounds of formula (I): (HOCH2)2—C—(R)2 , ??(I) in which the radicals R independently of one another are each a further methylol group, an alkyl group having from 1 to 22 C atoms or an aryl or aralkyl group having from 6 to 22 C atoms, by (a) condensing aldehydes having from 2 to 24 C atoms with formaldehyde in an aldol reaction using tertiary amines as a catalyst to give alkanals of formula (II): in which the radicals R independently of one another are each as defined above, (b) then separating, by distillation, the reaction mixture obtained into a bottom product comprising predominantly the compounds of formula II and a low-boiling stream consisting of unconverted or partially converted starting materials, and (c) hydrogenating the distillation bottom, wherein the aldol reaction is carried out with an aqueous formaldehyde solution having a methanol content of 0.35 to 0.Type: ApplicationFiled: June 28, 2006Publication date: January 3, 2008Applicant: BASF AktiengesellschaftInventors: Tilman Sirch, Michael Steiniger, Steffen Mass, Stefan Rittinger, Stephan Schlitter, Ludwig E. Heck, Todd C. Spengeman, Jeffrey T. Andress
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Patent number: 7307194Abstract: The present invention provides a process for preparing 1,6-hexanediol from a carboxylic acid mixture which comprises adipic acid, 6-hydroxycaproic acid and small amounts of 1,4-cyclohexanediols and is obtained as a by-product in the oxidation of cyclohexane to cyclohexanone/cyclohexanol with oxygen or oxygen-containing gases and by water extraction of the reaction mixture, by esterification of the acids and hydrogenation, in which a) the mono- and dicarboxylic acids present in the aqueous dicarboxylic acid mixture are reacted with a low molecular weight alcohol to give the corresponding carboxylic esters, b) the resulting esterification mixture is freed of excess alcohol and low boilers in a first distillation stage, c) a separation of the bottom product is carried out in a second distillation stage into an ester fraction substantially free of 1,4-cyclohexanediols and a fraction comprising at least the majority of the 1,4-cyclohexanediols, d) the ester fraction substantially free of 1,4-cyclohexanediols isType: GrantFiled: October 27, 2005Date of Patent: December 11, 2007Assignee: BASF AktiengesellschaftInventors: Tilman Sirch, Gerd-Dieter Tebben, Ludwig E. Heck, Armin Diefenbacher, Alfred Krause, Franz Borgel
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Publication number: 20070282135Abstract: Process for the catalytic hydrogenation of methylolalkanals of the general formula where R1 and R2 are each, independently of one another, a further methylol group or an alkyl group having from 1 to 22 carbon atoms or an aryl or aralkyl group having from 6 to 33 carbon atoms, in the liquid phase by means of hydrogen over a hydrogenation catalyst, wherein hydrogen is used in a molar ratio to methylolalkanal of greater than 1.Type: ApplicationFiled: June 6, 2006Publication date: December 6, 2007Applicant: BASF AktiengesellschaftInventors: Steffen Maas, Thorsten Johann, Michael Koch, Tilman Sirch, Stephan Schlitter, Stefan Rittinger, Michael Steiniger, Todd C. Spengeman
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Patent number: 7301058Abstract: The invention relates to a method for increasing yield in the production of polyvalent alcohols, especially trimethylolpropane, obtained by condensing formaldehyde with a higher aldehyde. According to the inventive method, acid treatment is carried out on a mixture (high-boiling fraction) that is obtained by reprocessing, contains derivatives of said alcohols and has a higher boiling point than the respective alcohol, and the polyvalent alcohol is recovered from the acid-treated high-boiling fraction. The inventive method is characterised in that the water content of the high-boiling fraction amounts to between 20 and 90 wt. % in relation to the entire mixture of the high-boiling fraction and water.Type: GrantFiled: July 18, 2003Date of Patent: November 27, 2007Assignee: BASF AktiengesellschaftInventors: Alexander Wartini, Tilman Sirch, Johann-Peter Melder, Matthias Dernbach
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Publication number: 20070197837Abstract: A process for removing trialkylammonium formate from methylolalkanes which have been obtained by condensation of formaldehyde with a higher aldehyde comprises decomposing trialkylammonium formate at elevated temperature in the presence of a hydrogen-containing gas over a catalyst comprising ruthenium supported on titanium dioxide. The process makes it possible to separate off the trialkylammonium formate from methylolalkanes prepared by the organic Cannizzaro process or by the hydrogenation process.Type: ApplicationFiled: July 7, 2004Publication date: August 23, 2007Inventors: Michael Koch, Alexander Wartini, Steffen Maas, Tilman Sirch, Matthias Dernbach
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Patent number: 7241914Abstract: The invention provides a process for preparing polyester polyols of polyhydric alcohols by mono- or polyesterification of at least one carboxylic acid having at least two acid groups and/or at least one derivative of a dicarboxylic acid with polyhydric alcohols, optionally with the addition of a catalyst, while removing the water of reaction, wherein the polyhydric alcohol used has a formaldehyde acetal content of less than 500 ppm.Type: GrantFiled: May 21, 2003Date of Patent: July 10, 2007Assignee: BASF AktiengesellschaftInventors: Alexander Wartini, Matthias Dernbach, Gerlinde Tischer, Tilman Sirch
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Publication number: 20070112225Abstract: The present invention provides a process for preparing 1,6-hexanediol from a carboxylic acid mixture which comprises adipic acid, 6-hydroxycaproic acid and small amounts of 1,4-cyclohexanediols and is obtained as a by-product in the oxidation of cyclohexane to cyclohexanone/cyclohexanol with oxygen or oxygen-containing gases and by water extraction of the reaction mixture, by esterification of the acids and hydrogenation, in which a) the mono- and dicarboxylic acids present in the aqueous dicarboxylic acid mixture are reacted with a low molecular weight alcohol to give the corresponding carboxylic esters, b) the resulting esterification mixture is freed of excess alcohol and low boilers in a first distillation stage, c) a separation of the bottom product is carried out in a second distillation stage into an ester fraction substantially free of 1,4-cyclohexanediols and a fraction comprising at least the majority of the 1,4-cyclohexanediols, d) the ester fraction substantially free of 1,4-cyclohexanediols is caType: ApplicationFiled: October 27, 2005Publication date: May 17, 2007Applicant: BASF AktiengesellschaftInventors: Tilman Sirch, Gerd-Dieter Tebben, Ludwig Heck, Armin Diefenbacher, Alfred Krause, Franz Borgel
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Patent number: 7112707Abstract: Trimethylolpropane is isolated from a reaction mixture which has been obtained by reaction of n-butyraldehyde with formaldehyde in the presence of a base and, if appropriate, hydrogenation of the resulting mixture by distilling the mixture by means of a dividing wall column or a distillation column with a precolumn or a distillation column with an after-column. The process has low capital costs and a low energy consumption and gives reduced formation of high-boiling by-products.Type: GrantFiled: December 6, 2002Date of Patent: September 26, 2006Assignee: BASF AktiengesellschaftInventors: Tilman Sirch, Gerd Kaibel, Alexander Wartini, Matthias Dernbach
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Patent number: 7064239Abstract: The present invention provides a process for preparing 1,6-hexanediol having a purity of ?99.5% by weight by catalytically dimerizing acrylic esters and catalytically hydrogenating the hexenedioic diesters obtained in this way to 1,6-hexanediol by a) dimerizing C1- to C8-acrylic esters in the presence of at least one rhodium compound to give mixtures of predominantly 2- and 3-hexenedioic diesters, b) hydrogenating the resulting dimerizing effluent in the presence of chromium-free catalysts comprising predominantly copper as the hydrogenation component and c) purifying the crude 1,6-hexanediol obtained in this way by fractional distillation.Type: GrantFiled: December 3, 2003Date of Patent: June 20, 2006Assignee: BASF AktiengesellschaftInventors: Rolf-Hartmuth Fischer, Thomas Krug, Andrea Haunert, Michael Röper, Tilman Sirch, Wolfram Stüer
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Publication number: 20060014988Abstract: The present invention provides a process for preparing 1,6-hexanediol having a purity of ?99.5% by weight by catalytically dimerizing acrylic esters and catalytically hydrogenating the hexenedioic diesters obtained in this way to 1,6-hexanediol by a) dimerizing C1- to C8-acrylic esters in the presence of at least one rhodium compound to give mixtures of predominantly 2- and 3-hexenedioic diesters, b) hydrogenating the resulting dimerizing effluent in the presence of chromium-free catalysts comprising predominantly copper as the hydrogenation component and c) purifying the crude 1,6-hexanediol obtained in this way by fractional distillation.Type: ApplicationFiled: December 3, 2003Publication date: January 19, 2006Applicant: BASF AKTIENGESELLSCHAFTInventors: Rolf-Hartmuth Fischer, Thomas Krug, Andrea Haunert, Michael Roper, Tilman Sirch, Wolfram Stuer
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Publication number: 20050256346Abstract: The invention relates to a method for increasing yield in the production of polyvalent alcohols, especially trimethylolpropane, obtained by condensing formaldehyde with a higher aldehyde. According to the inventive method, acid treatment is carried out on a mixture (high-boiling fraction) that is obtained by reprocessing, contains derivatives of said alcohols and has a higher boiling point than the respective alcohol, and the polyvalent alcohol is recovered from the acid-treated high-boiling fraction. The inventive method is characterised in that the water content of the high-boiling fraction amounts to between 20 and 90 wt. % in relation to the entire mixture of the high-boiling fraction and water.Type: ApplicationFiled: July 18, 2003Publication date: November 17, 2005Applicant: BASF AKTIENGESELLSCHAFTInventors: Alexander Wartini, Tilman Sirch, Johann-Peter Melder, Matthias Dernbach
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Publication number: 20050203268Abstract: The invention provides a process for preparing polyester polyols of polyhydric alcohols by mono- or polyesterification of at least one carboxylic acid having at least two acid groups and/or at least one derivative of a dicarboxylic acid with polyhydric alcohols, optionally with the addition of a catalyst, while removing the water of reaction, wherein the polyhydric alcohol used has a formaldehyde acetal content of less than 500 ppm.Type: ApplicationFiled: May 21, 2003Publication date: September 15, 2005Applicant: BASF AktiengesellschaftInventors: Alexander Wartini, Matthias Dernbach, Gerlinde Tischer, Tilman Sirch
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Publication number: 20050148802Abstract: The invention provides a process for preparing polyetherols of polyhydric alcohols by reacting an alkylene oxide with the appropriate polyhydric alcohol in the presence of a base and in the presence or absence of a solvent, wherein the polyhydric alcohol used has a formaldehyde acetal content of less than 500 ppm.Type: ApplicationFiled: May 21, 2003Publication date: July 7, 2005Inventors: Alexander Wartini, Matthias Dernbach, Claus Hackmann, Tilman Sirch
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Patent number: 6914164Abstract: A method for removing trialkyl ammonium formate from a methylol alkanes obtained by condensation of formaldehyde with a higher aldehyde. The invention is characterized in that trialkyl ammonium formate is decomposed at a high temperature using catalysts containing at least one metal from groups 8-12 of the classification of elements in the presence of gas containing hydrogen. The method makes it possible to separate trialkyl ammonium formate according to the organic Cannizzaro method and according to the hydrogenation method.Type: GrantFiled: October 18, 2002Date of Patent: July 5, 2005Assignee: BASF AGInventors: Michael Koch, Alexander Wartini, Tilman Sirch, Matthias Dernbach
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Publication number: 20050010065Abstract: (Meth)acrylates of polyhydric alcohols are prepared by reacting (meth)acrylic acid and the corresponding polyhydric alcohol in the presence of at least one acidic catalyst and, if required, at least one polymerization inhibitor and in the presence or absence of a solvent, by a process in which the polyhydric alcohol used contains less than 500 ppm of bound formaldehyde.Type: ApplicationFiled: November 8, 2002Publication date: January 13, 2005Inventors: Alexander Wartini, Matthias Dernbach, Jurgen Schroder, Friedrich-Georg Martin, Tilman Sirch
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Publication number: 20040267055Abstract: Trimethylolpropane is isolated from a reaction mixture which has been obtained by reaction of n-butyraldehyde with formaldehyde in the presence of a base and, if appropriate, hydrogenation of the resulting mixture by distilling the mixture by means of a dividing wall column or a distillation column with a precolumn or a distillation column with an after-column. The process has low capital costs and a low energy consumption and gives reduced formation of high-boiling by-products.Type: ApplicationFiled: June 3, 2004Publication date: December 30, 2004Inventors: Tilman Sirch, Gerd Kaibel, Alexander Wartini, Matthias Dernbach
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Publication number: 20040254408Abstract: The invention relates to a method for producing polymethylol compounds of formula (I), in which R represents a further methylol group or an alkyl group with between 1 and 22 C atoms or an aryl or alkyl aryl group with between 6 and 22 C atoms, by condensating aldehydes with between 2 and 24 C atoms with formaldehyde, using tertiary amines as catalysts, with a view to obtaining compounds of formula (II), in which R has the meaning assigned to it above. The invention further relates to a process for hydrogenating polymethylol compounds by condensation in stages.Type: ApplicationFiled: April 22, 2004Publication date: December 16, 2004Inventors: Michael Koch, Alexander Wartini, Tilman Sirch, Matthias Dernbach
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Patent number: 6500371Abstract: The invention relates to a continuous process for preparing aminoplastics and/or phenolics, in which a precondensate solution is prepared in a first extruder (14), the precondensate solution is continuously fed, with addition of additives, to a second extruder (20) with partial filling in the feed section (E) and devolatilization section (G), devolatilized in the second extruder (20) and then formed to give a molding composition or an end product. The process is particularly suitable for preparing melamine resins, in particular melamine-formaldehyde resins, as well as for preparing urea-formaldehyde resins.Type: GrantFiled: February 7, 2000Date of Patent: December 31, 2002Assignee: BASF AktiengesellschaftInventors: Heinz Berbner, Hans Etling, Erhard Guenther, Tilman Sirch, Hans Dieter Zettler