Patents by Inventor Friedrich Bruhne

Friedrich Bruhne 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: 4528146
    Abstract: An improved process for the preparation of terephthaloyl and isophthaloyl dichlorides by chlorination of dimethyl terephthalate and isophthalate with chlorine gas at temperatures from 100.degree.-250.degree. C., optionally in the presence of light and/or catalysts promoting side-chain chlorination of aromatic compounds, according to which 20 to 200% by weight, relative to the weight of dimethyl terephthalate and/or isophthalate, of terephthaloyl and/or isophthaloyl dichloride are added to the dimethyl terephthalate and/or isophthalate for the chlorination.
    Type: Grant
    Filed: May 12, 1983
    Date of Patent: July 9, 1985
    Assignee: Bayer Aktiengesellschaft
    Inventors: Walter Bockmann, Friedrich Bruhne, Karl-August Lipper
  • Patent number: 4430181
    Abstract: Benzoyl chloride is prepared by a process in which the high-boiling residue obtained in the catalytic oxidation of toluene with oxygen or oxygen-containing gases in the liquid phase is largely freed of heavy metal salts which are present, and is then chlorinated at elevated temperatures, optionally under the action of light, and the benzoyl chloride is then separated off.
    Type: Grant
    Filed: October 22, 1982
    Date of Patent: February 7, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rainer Neumann, Karl Morgenstern, Karl-August Lipper, Friedrich Bruhne, Walter Bockmann, Clemens Casper, Siegfried Zingel
  • Patent number: 4294777
    Abstract: A process for color stabilizing aromatic carboxylic acid chloride against discoloration which comprises introducing into a composition containing an aromatic carboxylic acid chloride 0.001 to 2% by weight of a color stabilizer, based upon the amount of said aromatic carboxylic acid chloride. The use of aldehydes, ketones, olefins, phosphorus and arsenic containing compounds are contemplated as stabilizer.
    Type: Grant
    Filed: October 17, 1979
    Date of Patent: October 13, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Walter Bockmann, Karl-August Lipper, Friedrich Bruhne
  • Patent number: 4276231
    Abstract: A process for the preparation of optionally substituted benzoyl chloride from optionally substituted benzotrichloride at elevated temperature in the presence of a catalyst is described wherein optionally substituted benzotrichloride or a mixture thereof with optionally substituted benzoyl chloride is reacted with an excess of 1 to 20 mol percent of optionally substituted benzoic acid and/or water and the hydrogen chloride-containing off-gases formed during the reaction are washed with optionally substituted benzotrichloride or the mixture of optionally substituted benzotrichloride and optionally substituted benzoyl chloride.
    Type: Grant
    Filed: September 4, 1979
    Date of Patent: June 30, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Walter Bockmann, Karl-August Lipper, Friedrich Bruhne
  • Patent number: 4229379
    Abstract: An improved process for the preparation of benzaldehyde by hydrolysis of benzal chloride wherein hydrolysis is carried out at an elevated temperature in the presence of an excess of aqueous hydrochloric acid and in the absence of another catalyst.
    Type: Grant
    Filed: November 6, 1978
    Date of Patent: October 21, 1980
    Assignee: Bayer Aktiengesellschaft
    Inventors: Friedrich Bruhne, Karl-August Lipper