Patents by Inventor Herbert Lepper

Herbert Lepper 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: 5391783
    Abstract: In the production of light-colored pastes of .alpha.-sulfofatty acid alkyl ester alkali metal salts by reaction of fatty acid alkyl esters with gaseous SO.sub.3, subsequent after-reaction in liquid phase, neutralization with aqueous alkali metal hydroxide solutions and bleaching, effective bleaching can be obtained without any reduction in the washing-active substance content by addition of the hydrogen peroxide during neutralization of the .alpha.-sulfofatty acid alkyl ester and subjecting the neutralization product obtained to a temperature-controlled after-reaction.
    Type: Grant
    Filed: December 14, 1992
    Date of Patent: February 21, 1995
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Dietmar Colignon, Erich Dorra, Herbert Lepper, Guenter Panthel, Francois Pierron, Wolfgang Schmidt, Norbert Wrede
  • Patent number: 4652406
    Abstract: Fatty acid alkyl esters are produced by catalytic transesterification of natural fats and oils containing free fatty acids. In a preliminary esterifying step, the free fatty acids present are reacted with a C.sub.1 -C.sub.4 alkanol (e.g., methanol) in the presence of an acidic esterification catalyst, at a temperature of about 50.degree. to 120.degree. C. and at substantially atmospheric pressure. The resulting reaction mixture is allowed to separate into two phases: (1) an alcohol phase containing the acidic esterification catalyst and part of the water of reaction and (2) an oil phase. These phases separately recovered. The oil phase is then extracted with an immiscible extractant, preferably comprising a mixture of glycerol and methanol, to remove residual water of reaction. In the final step the extracted oil phase is transesterified with a C.sub.1 -C.sub.4 alkanol, e.g. methanol, in the presence of an aklali catalyst and at substantially atmospheric pressure.
    Type: Grant
    Filed: December 6, 1985
    Date of Patent: March 24, 1987
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Herbert Lepper, Lothar Friesenhagen
  • Patent number: 4608202
    Abstract: For the production of fatty acid esters of short-chain, aliphatic alcohols by the catalytic transesterification of natural fats and/or oils containing free fatty acids (oil phase) with the corresponding monoalcohols, the oil phase is subjected to preliminary esterification with the monoalcohols in the presence of acidic esterification catalysts at temperatures no higher than 120.degree. C. and under pressures no higher than 5 bars and in the presence of a liquid entraining agent substantially immiscible with the oil phase, after which the reaction product is separated into an entraining agent phase containing the acidic catalyst and water of reaction and the treated oil phase, the oil phase is then subjected to transesterification while the acidic catalyst-containing entraining agent phase is returned, after at least partial drying, to the preliminary esterification stage.
    Type: Grant
    Filed: April 11, 1984
    Date of Patent: August 26, 1986
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Herbert Lepper, Lothar Friesenhagen
  • Patent number: 4520211
    Abstract: This invention is directed to the preparation of polyhydric alcohols. More specifically, this invention is directed to a continuous process for preparing polyhydric alcohols by the hydrogenation of carbohydrates in the presence of ruthenium-containing catalysts at elevated temperatures and elevated pressure, the improvement wherein the catalyst comprises a catalyst solid bed of ruthenium carrier catalyst in lumps.
    Type: Grant
    Filed: February 24, 1984
    Date of Patent: May 28, 1985
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Herbert Lepper, Hartwig Schutt
  • Patent number: 3991117
    Abstract: A process for the oxidative cleavage of vicinal diols having more than 2 carbon atoms in the presence of catalytic amounts of a heavy metal catalyst.
    Type: Grant
    Filed: June 4, 1971
    Date of Patent: November 9, 1976
    Assignee: Henkel & Cie G.m.b.H.
    Inventors: Ulrich Zeidler, Manfred Dohr, Herbert Lepper
  • Patent number: 3931259
    Abstract: The present invention provides a process for the preparation of carboxylic acids, which comprises reacting relatively long-chain vicinal diols and/or their complete or part esters with lower carboxylic acids with nitric acid having a concentration of at least 65% at temperatures from 40.degree. to 100.degree.C, and recovering said carboxylic acids.
    Type: Grant
    Filed: November 19, 1971
    Date of Patent: January 6, 1976
    Assignee: Henkel & Cie G.m.b.H.
    Inventors: Herbert Lepper, Werner Stein