Patents by Inventor Alfred Oftring

Alfred Oftring 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).

  • Patent number: 8309759
    Abstract: The present invention relates to a process for preparing ether carboxylates.
    Type: Grant
    Filed: February 17, 2011
    Date of Patent: November 13, 2012
    Assignee: BASF SE
    Inventors: Robert Baumann, Markus Christian Biel, Andreas Deckers, Alfred Oftring, Frank Rittig, Wolfgang Staffel
  • Publication number: 20120283473
    Abstract: A process is proposed for the preparation of a crystalline L-MGDA trialkali metal salt by crystallization from an aqueous solution thereof which has been obtained by Strecker synthesis, starting from L-?-alanine, by reaction with formaldehyde and hydrocyanic acid to give L-?-alanine-N,N-diacetonitrile and subsequent alkaline saponification of the L-?-alanine-N,N-diacetonitrile to give the L-MGDA trialkali metal salt, wherein a temperature of 150° C. is not exceeded during the alkaline saponification.
    Type: Application
    Filed: May 3, 2012
    Publication date: November 8, 2012
    Applicant: BASF SE
    Inventors: Alfred OFTRING, Maxim Weber, Gerold Braun, Arnulf Lauterbach
  • Patent number: 8299249
    Abstract: The invention relates to a process for preparing triethylenetetramine (TETA), which, comprises the following steps: a) reaction of ethylenediamine (EDA) with formaldehyde and hydrocyanic acid (HCN) in a molar ratio of EDA to formaldehyde to HCN of from 1:1.5:1.5 to 1:2:2 to give ethylenediaminediacetonitrile (EDDN), b) hydrogenation of the EDDN obtained in step a) in the presence of a catalyst and a solvent.
    Type: Grant
    Filed: February 28, 2008
    Date of Patent: October 30, 2012
    Assignee: BASF SE
    Inventors: Kirsten Dahmen, Alfred Oftring, Katrin Baumann, Randolf Hugo, Thilo Hahn, Johann-Peter Melder
  • Publication number: 20120264973
    Abstract: The present invention relates to a process for preparing aminopolycarboxylates proceeding from an amino acid which, in a first process step is reacted with ethylene oxide to give an intermediate mixture comprising the corresponding dialkanolamine, and then the intermediate mixture, in a second process step is converted catalytically using a base to the corresponding aminopolycarboxylate, wherein the amino acid, before the reaction with ethylene oxide in the first process step, is supplied to a partial neutralization with 0.70 to 0.99 equivalent of base per acid group, or, in the first process step, an amino acid which has already been partly neutralized with 0.70 to 0.99 equivalent of base per acid group is used.
    Type: Application
    Filed: March 26, 2012
    Publication date: October 18, 2012
    Applicant: BASF SE
    Inventors: Robert Baumann, Markus Christian Biel, Axel Franzke, Thomas Heidenfelder, Paul Klingelhoefer, Alfred Oftring
  • Publication number: 20120248370
    Abstract: A process for preparing an aqueous solution of a methylglycine-N,N-diacetic acid trialkali metal salt at a high yield and purity by Strecker synthesis, the process including: reacting an aqueous solution containing ?-alanine with formaldehyde and hydrocyanic acid, to obtain ?-alanine-N,N-diacetonitrile in one reaction unit; and saponification of the ?-alanine-N,N-diacetonitrile with a base, to obtain the methylglycine-N,N-diacetic acid trialkali metal salt, wherein the ?-alanine is partially neutralized and the addition of formaldehyde and hydrocyanic acid are controlled such that a concentration of free hydrocyanic acid in the liquid reaction mixture at any time is limited such that secondary reactions that produce formaldehyde cyanohydrin, consecutive reactions of formaldehyde cyanohydrin, and the polymerization of hydrocyanic acid, only occur insofar as the specification requirements, such as nitrilotriacetic acid content and color, for methylglycine-N,N-diacetic acid trialkali metal salts are observed.
    Type: Application
    Filed: March 27, 2012
    Publication date: October 4, 2012
    Applicant: BASF SE
    Inventors: Alfred OFTRING, Gerold BRAUN, Arnulf LAUTERBACH
  • Publication number: 20120184769
    Abstract: A method for isolating methylglycinenitrile-N,N-diacetonitrile (MGDN) from an aqueous mixture comprising MGDN is provided The method comprises cooling the aqueous mixture in one or more steps In one of these steps the mixture is cooled at a cooling rate of at least 20 K/h from a temperature above the solidification point of MGDN to a temperature below the solidification point of MGDN The method is implemented continuously
    Type: Application
    Filed: September 29, 2010
    Publication date: July 19, 2012
    Applicant: BASF SE
    Inventors: Bernd Judat, Alfred Oftring, Armin Stamm, Friedhelm Teich
  • Publication number: 20120101303
    Abstract: The invention relates to a process for preparing triethylenetetramine substituted by at least one methyl group (Me-TETA or methyl-substituted TETA compounds). Me-TETA is prepared by hydrogenating biscyanomethylimidazolidine (BCMI) in the presence of a catalyst. The present invention further relates to methyl-substituted TETA compounds as such. The present invention further relates to the use of methyl-substituted TETA compounds as a reactant or intermediate in the production of, for example, coatings or adhesives.
    Type: Application
    Filed: June 14, 2010
    Publication date: April 26, 2012
    Applicant: BASF SE
    Inventors: Randolf Hugo, Johann-Peter Melder, Robert Baumann, Alfred Oftring, Boris Buschhaus, Gordon Brasche, Sebastian Ahrens, Peter Pfab
  • Patent number: 8163951
    Abstract: The present invention relates to a process for preparing quaternary ammonium compounds, which comprises reacting compounds comprising an sp3-hybridized nitrogen atom with a dialkyl sulfate or trialkyl phosphate and subjecting the resulting ammonium compound to an anion exchange.
    Type: Grant
    Filed: May 27, 2005
    Date of Patent: April 24, 2012
    Assignee: BASF Aktiengesellschaft
    Inventors: Laszlo Szarvas, Klemens Massonne, Matthias Maase, Alfred Oftring
  • Patent number: 8153845
    Abstract: The invention relates to a process for preparing an amino nitrile mixture comprising aminoacetonitrile (AAN) and from 5 to 70% by weight of iminodiacetonitrile (IDAN), which comprises heating crude AAN which is largely free of formaldehyde cyanohydrin (FACH-free) at a temperature of from 50 to 150° C.
    Type: Grant
    Filed: February 28, 2008
    Date of Patent: April 10, 2012
    Assignee: BASF SE
    Inventors: Alfred Oftring, Kirsten Dahmen, Thilo Hahn, Randolf Hugo, Katrin Baumann, Johann-Peter Melder
  • Publication number: 20110257431
    Abstract: The present invention relates to a process for preparing aminocarboxylates, proceeding from amines, by employing a reaction sequence composed of ethoxylation to amino alcohols and subsequent oxidative dehydrogenation to the corresponding aminocarboxylates, especially the alkali metal or alkaline earth metal salts of the complexing agents MGDA (methylglycinediacetic acid), EDTA (ethylenediaminetetra-acetic acid) and GLDA (glutamic acid diacetic acid) or the free acids thereof.
    Type: Application
    Filed: March 17, 2011
    Publication date: October 20, 2011
    Applicant: BASF SE
    Inventors: Robert Baumann, Markus Christian Biel, Gordon Brasche, Axel Franzke, Thomas Heidenfelder, Paul Klingelhoefer, Alfred Oftring, Marie Katrin Schroter
  • Publication number: 20110207634
    Abstract: The present invention relates to a process for preparing ether carboxylates.
    Type: Application
    Filed: February 18, 2011
    Publication date: August 25, 2011
    Applicant: BASF SE
    Inventors: Robert Baumann, Markus Christian Biel, Andreas Deckers, Alfred Oftring, Frank Rittig, Wolfgang Staffel
  • Publication number: 20110207651
    Abstract: The present invention relates to a process for preparing ether carboxylates.
    Type: Application
    Filed: February 17, 2011
    Publication date: August 25, 2011
    Applicant: BASF SE
    Inventors: Robert Baumann, Markus Christian Biel, Andreas Deckers, Alfred Oftring, Frank Rittig, Wolfgang Staffel
  • Patent number: 7977434
    Abstract: The present invention relates to a polymer for use as a bleach activator, comprising the monomer units where n is an integer from 1 to 4 and R is a branched or unbranched, saturated hydrocarbyl radical having from 1 to 20 carbon atoms, to processes for the preparation and to the use thereof as laundry detergents, cleaning compositions and disinfectant compositions, and also in textile bleaching and paper bleaching.
    Type: Grant
    Filed: January 25, 2006
    Date of Patent: July 12, 2011
    Assignee: BASF Aktiengesellschaft
    Inventors: Frank Dietsche, Alfred Oftring
  • Patent number: 7960591
    Abstract: The invention relates to a process for preparing triethylenetetramine (TETA), which comprises hydrogenating ethylenediaminediacetonitrile (EDDN) in the presence of a catalyst and a solvent.
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: June 14, 2011
    Assignee: BASF SE
    Inventors: Kirsten Dahmen, Alfred Oftring, Randolf Hugo, Katrin Baumann, Thilo Hahn, Johann-Peter Melder
  • Patent number: 7960590
    Abstract: The invention relates to a process for preparing an ethylene amine mixture, which comprises the following steps: a) crude AAN which is largely free of formaldehyde cyanohydrin (largely FACH-free) is heated at a temperature of from 50 to 150° C. to give an amino nitrile mixture comprising aminoacetonitrile (AAN) and from 5 to 70% by weight of iminodiacetonitrile (DAN), b) hydrogenation of the amino nitrile mixture obtained in step a) in the presence of a catalyst. Ethylenediamine (EDA) and/or diethylenetriamine (DETA) and also, if appropriate, further ethylene amines can be isolated from the ethylene amine mixtures obtained.
    Type: Grant
    Filed: February 28, 2008
    Date of Patent: June 14, 2011
    Assignee: BASF SE
    Inventors: Kirsten Dahmen, Alfred Oftring, Randolf Hugo, Thilo Hahn, Katrin Baumann, Johann-Peter Melder
  • Publication number: 20110124919
    Abstract: The present invention relates to 3-aminomethyl-1-cyclohexylamine and to a process for preparation thereof by a) reacting cyclohexenone with hydrogen cyanide in the presence of a basic catalyst, b) reacting the cyclohexanonenitrile obtained in stage a) with ammonia in the presence of an imine formation catalyst, and c) reacting the 3-cyanocyclohexylimine-containing reaction mixture obtained in stage b) with hydrogen and ammonia over hydrogenation catalysts. The present invention further relates to the use of 3-aminomethyl-1-cyclohexylamine as a hardener for epoxy resins, as an intermediate in the preparation of diisocyanates, as a starter in the preparation of polyetherols and/or as a monomer for polyamide preparation.
    Type: Application
    Filed: July 13, 2009
    Publication date: May 26, 2011
    Applicant: BASF SE
    Inventors: Martin Ernst, Kirsten Dahmen, Alfred Oftring
  • Publication number: 20110124918
    Abstract: The present invention relates to 5-isopropyl-3-aminomethyl-2-methyl-1-aminocyclohexane (carvonediamine) and to a process for preparation thereof by a) reacting carvone with hydrogen cyanide, b) then reacting the carvonenitrile obtained in stage a) with ammonia in the presence of an imine formation catalyst and c) then reacting the carvonenitrile imine-containing reaction mixture obtained in stage b) with hydrogen and ammonia over hydrogenation catalysts. The present invention further relates to the use of carvonediamine as a hardener for epoxy resins, as an intermediate in the preparation of diisocyanates, as a starter in the preparation of polyetherols and/or as a monomer for polyamide preparation.
    Type: Application
    Filed: July 13, 2009
    Publication date: May 26, 2011
    Applicant: BASF SE
    Inventors: Martin Ernst, Alfred Oftring, Kathrin Wissel-Stoll, Oemer Uensal, Stephan Freyer, Ansgar Gereon Altenhoff, Wolfgang Staffel
  • Patent number: 7915454
    Abstract: The invention relates to a process for preparing ethylenediamine by hydrogenation of aminoacetonitrile over a catalyst, wherein the hydrogenation is carried out in a solution comprising aminoacetonitrile, water in a proportion of from 0 to 60% by weight and a solvent and the aminoacetonitrile comprised in the solution is fed into the reaction vessel at a rate which is not greater than the rate at which the aminoacetonitrile reacts with hydrogen in the hydrogenation.
    Type: Grant
    Filed: February 28, 2008
    Date of Patent: March 29, 2011
    Assignee: BASF SE
    Inventors: Alfred Oftring, Kirsten Dahmen, Randolf Hugo, Thilo Hahn, Katrin Baumann, Johann-Peter Melder
  • Patent number: 7880036
    Abstract: The invention relates to a process for preparing an ethylene amine mixture, which comprises hydrogenating an amino nitrile mixture comprising at least two ?-amino nitriles in an amount of at least 5% by weight in each case in the presence of a catalyst and, if appropriate, a solvent.
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: February 1, 2011
    Assignee: BASF SE
    Inventors: Kirsten Dahmen, Alfred Oftring, Katrin Baumann, Randolf Hugo, Thilo Hahn, Johann-Peter Melder
  • Patent number: 7880035
    Abstract: The invention relates to a process for preparing an ethylene amine mixture, which comprises hydrogenating an amino nitrile mixture comprising at least 30% by weight of aminoacetonitrile (AAN) and at least 5% by weight of iminodiacetonitrile (IDAN) in the presence of a catalyst. Ethylenediamine (EDA) and/or diethylenetriamine (DETA) and, if appropriate, further ethylene amines can be isolated from the ethylene amine mixtures obtained.
    Type: Grant
    Filed: February 28, 2008
    Date of Patent: February 1, 2011
    Assignee: BASF SE
    Inventors: Alfred Oftring, Kirsten Dahmen, Thilo Hahn, Randolf Hugo, Katrin Baumann, Johann-Peter Melder