Patents by Inventor Georg Dambkes

Georg Dambkes 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).

  • Mixtures of isomeric pentanoic acids, esters prepared therefrom, and their use as lubricants
    Patent number: 5410072
    Abstract: Isomeric mixtures of pentanoic acids are prepared by subjecting butene-1/butene-2 mixtures to hydroformylation to form aldehyde mixtures, followed by oxidation of the aldehyde mixtures which have been separated off from the reaction product. The hydroformylation is carried out in a heterogeneous system in the presence of rhodium catalysts which are dissolved in water. The mixture of isomeric 5 carbon monocarboxylic acids produced, when esterified with polyhydric alcohols, yields mixtures of isomeric esters which are useful as lubricants for refrigerant compressors operated with chlorine-free, at least partly fluorinated hydrocarbons as the refrigerant.
    Type: Grant
    Filed: September 23, 1994
    Date of Patent: April 25, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Helmut Bahrmann, Wolfgang Greb, Georg Dambkes, Peter Heymanns, Heinz Kalbfell, Peter Lappe, Helmut Springer, Eberhard von Mulmann, Jurgen Weber, Ernst Wiebus, Carl D. Frohning, Harald Kappesser
  • Process for the preparation of 2,2-dimethylpropane-1,3-diol
    Patent number: 5072058
    Abstract: A process for the preparation of 2,2-dimethylpropane-1,3-diol by an addition reaction between isobutyraldehyde and formaldehyde in the presence of tertiary amines as the catalyst, hydrogenation of the reaction mixture, and subsequent distillation. Before the distillation, formaldehyde is added to the hydrogenation product to remove unwanted basic impurities.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: December 10, 1991
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Georg Dambkes, Peter Lappe, Franz Thonnessen, Helmut Springer
  • Process for preparing 3(4),8(9)-bis(aminomethyl)-tricyclo[5.2.1.0.sup.2,6 ] d
    Patent number: 5041675
    Abstract: This invention relates to a process for preparing 3(4),8(9)-bis(aminomethyl)tricyclo[5.2.1.0.sup.2,6 ]decane. The starting material for the synthesis of this compound is dicyclopentadiene, which is hydroformylated in the presence of a rhodium compound and subjected to reductive amination without the hydroformylation catalyst being separated from the reaction mixture.
    Type: Grant
    Filed: August 17, 1990
    Date of Patent: August 20, 1991
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Rainer Lukas, Klaus Mathieu, Franz Thonnessen, Georg Dambkes, Hanswilhelm Bach
  • Process for purifying propanediol-1,3
    Patent number: 5008473
    Abstract: A process for the purification of propanediol-1,3, especially when produced by hydration of acrolein with water, including extracting the diol with cyclohexane. Preferably, from 2 to 10 parts by weight of cyclohexane per part by weight of diol is used. The purification is usually carried out below 60.degree. C.
    Type: Grant
    Filed: September 17, 1987
    Date of Patent: April 16, 1991
    Assignee: Ruhrchemie Aktiengesellschaft
    Inventors: Norbert Breitkopf, Georg Dambkes, Hanswilhelm Bach
  • Process for purification of gases
    Patent number: 4711648
    Abstract: A process for the purification of a gas containing one or more of hydrogen sulfide, hydrogen cyanide, and carbonyl sulfide as impurities comprising contacting the gas with at least one aliphatic aldehyde which is liquid under the purification conditions. The gas is inert to the aldehyde under such conditions. The process is useful in the purification of synthesis gas for use in reactions wherein sensitive catalysts are employed.
    Type: Grant
    Filed: September 11, 1986
    Date of Patent: December 8, 1987
    Assignee: Ruhrechemie Aktiengesellschaft
    Inventors: Werner Konkol, Helmut Bahrmann, Georg Dambkes, Wilhelm Gick, Ernst Wiebus, Hanswilhelm Bach
  • Process for preparing aldehydes
    Patent number: 4593126
    Abstract: A process for the hydroformylation of aldehydes comprising reacting aliphatic olefins with carbon monoxide and hydrogen in a liquid phase in the presence of water, a rhodium catalyst and a water soluble salt of a sulfonated or carboxylated triarylphosphine, the reaction taking place in the presence of an aqueous phase having a pH of about 5.5 to about 6.2.
    Type: Grant
    Filed: April 4, 1985
    Date of Patent: June 3, 1986
    Assignee: Ruhrchemie Aktiengesellschaft
    Inventors: Boy Cornils, Werner Konkol, Hanswilhelm Bach, Georg Dambkes, Wilhelm Gick, Wolfgang Greb, Ernst Wiebus, Helmut Bahrmann