Patents by Inventor Gerhard Daum

Gerhard Daum 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: 4417073
    Abstract: A process for the preparation of substituted acetic acids and derivatives thereof, having the formula ##STR1## wherein X is --COOH, --COOY or --CN,Y is --CH.sub.3 or --C.sub.2 H.sub.5,R.sub.1 is a saturated, branched or unbranched aliphatic radical having from 1 to 6 carbon atoms, a phenyl radical, or a phenyl radical substituted by alkyl or alkoxy groups, andR.sub.2 is hydrogen or a saturated, branched or unbranched aliphatic radical having from 1 to 6 carbon atoms, a phenyl radical, or a phenyl radical substituted by alkyl or alkoxy groups,wherein R.sub.1 and R.sub.2 may be the same or different which process comprises converting the corresponding malonic or cyanoacetic ester of the formula ##STR2## wherein Z is --COOY or --CN, andY, R.sub.1 and R.sub.2 are identified as above at elevated temperature in the presence of a catalyst, e.g., a catalyst containing from about 50 to 75 weight percent SiO.sub.2 and from 15 to 19 weight percent Al.sub.2 O.sub.
    Type: Grant
    Filed: November 25, 1981
    Date of Patent: November 22, 1983
    Assignee: Dynamit Nobel A.G.
    Inventors: Otto Ackermann, Gerhard Daum
  • Patent number: 4335052
    Abstract: A process for the preparation of Benzaldehydes substituted in the nucleus is disclosed by oxidation of the corresponding benzyl halides. The process is performed in the presence of water using aminoxides of tertiary amines.
    Type: Grant
    Filed: November 24, 1980
    Date of Patent: June 15, 1982
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Gunther Bernhardt, Egon-Norbert Petersen, Gerhard Daum
  • Patent number: 4283565
    Abstract: There is described an essentially two step process for the preparation of benzylalcohols including those benzylalcohols having substituents on the benzyene ring by reaction of a substituted or unsubstituted benzyl halide with a formate typically an alkali or alkaline earth metal formate to form the corresponding substituted or unsubstituted benzyl formate. In the second step of the process the benzyl formate is contacted with an alcohol whereby the same is converted into the desired benzylalcohol. Both steps can be performed employing catalysts. Described in the specification is the realization of the desired product in exceptionally high yields in a short period of time whereby the process is characterized by high space-time yields.
    Type: Grant
    Filed: December 29, 1978
    Date of Patent: August 11, 1981
    Assignee: Dynamit Nobel AG
    Inventors: Gunther Bernhardt, Gerhard Daum
  • Patent number: 4239703
    Abstract: A process for the preparation of a terephthalic, isophthalic or phthalic dialdehyde is described by dehydrogenation of the corresponding xylylene glycol in the vapor phase at 250.degree. to 500.degree. C. The process is carried out in the presence of oxygen, water vapor and a dehydrogenation catalyst, suitably a silver dehydrogenation catalyst.
    Type: Grant
    Filed: August 1, 1979
    Date of Patent: December 16, 1980
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Gunther Bernhardt, Gerhard Daum
  • Patent number: 4182910
    Abstract: An improvement in the process for preparing an orthoacetic acid alkyl ester of the formula ##STR1## wherein R is a saturated, branched or un-branched, alkyl moiety of 1 to 8 carbon atoms by:(a) contacting acetonitrile with an anhydrous alkanol having 1 to 8 carbon atoms and dry hydrogen chloride in the presence of an organic solvent to prepare the corresponding imidoester hydrochloride;(b) thereafter contacting said imidoester hydrochloride in the acid-free state with an alkanol having 1 to 8 carbon atoms; and(c) removing by-product ammonium chloride from the resultant reaction mixture and distilling the reaction mixture to recover orthoacetic acid alkyl ester, the improvement residing in(d) employing as the organic solvent an inert solvent having a dielectric constant measured at 25.degree. C. of 2.6 or less; and(e) contacting said imidoester hydrochloride in step (b) with an alkali metal or alkaline earth metal alcoholate before contacting the same with said alkanol.
    Type: Grant
    Filed: October 6, 1977
    Date of Patent: January 8, 1980
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Hans-Georg Schmidt, Gerhard Daum, Wilhelm Vogt
  • Patent number: 4137268
    Abstract: A process for the preparation of an aminoacetaldehyde acetal of the formula ##STR1## wherein R is a saturated branched or unbranched alkyl radical of 1 to 4 carbon atommsBy contacting a dialkoxyacetonitrile of the formula ##STR2## wherein R has the same meaning with hydrogen at an elevated pressure and at a temperature of 50-180.degree. C., preferably in the presence of a catalyst and preferably in the presence of ammonia.
    Type: Grant
    Filed: August 25, 1976
    Date of Patent: January 30, 1979
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Gerhard Daum, Wilhelm Vogt
  • Patent number: 4086237
    Abstract: 3-METHYL PYRIDINE IS PRODUCED BY CATALYTIC, E.G. PALLADIUM, DEHYDROGENATION OF 2-METHYL-1,5-DIAMINOPENTANE OR A MIXTURE THEREOF WITH 3-METHYL PIPERIDINE, AT 200.degree.-400.degree. C.
    Type: Grant
    Filed: April 28, 1976
    Date of Patent: April 25, 1978
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Gerhard Daum, Hermann Richtzenhain