Patents by Inventor Hans Leuck

Hans Leuck 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).

  • Method for the production of benzene carboxylic acids and benzene dicarboxylic acid esters
    Patent number: 4908471
    Abstract: Disclosed is a method for the production of benzene carboxylic acids and benzene carboxylic acid esters or their mixtures, while p-toloylic acid is made from p-xylene and terephthalic acid monomethyl ester is simultaneously prepared from p-toluylic acid ester. The oxidation is performed by the addition of oxidator liquid and gases containing oxygen in single orifice mixing nozzles with the formation of a highly disperse reaction phase and the single orifice mixing nozzles open into the oxidator liquid.
    Type: Grant
    Filed: February 16, 1988
    Date of Patent: March 13, 1990
    Assignee: Huels Troisdorf AG
    Inventors: Hans Leuck, Hans-Jorg Westermann
  • Process for producing the sodium salt of 2-nitro-1,3-propanediol
    Patent number: 4754079
    Abstract: A safe production of sodium nitro-1,3-propanediol from a reaction solution of nitromethane and paraformaldehyde in methanol by addition of sodium methylate is achieved by evaporative cooling of the methanol; it being possible to maintain reaction temperatures of 35.degree. C. to 50.degree. C.
    Type: Grant
    Filed: March 23, 1987
    Date of Patent: June 28, 1988
    Assignee: Dynamit Nobel AG
    Inventors: Gunter Bison, Hans Leuck, Klaus Thewalt, Hans-Jorg Westerman
  • Method of preparing 1,2-dichloroethane from ethylene and chlorine gas
    Patent number: 4554392
    Abstract: In this method of producing 1,2-dichloroethane from ethylene and chlorine gas in an approximately equimolar ratio at reaction pressures between 2 and 20 bar, at ethylene dichloride boiling temperatures between 105.degree. and 225.degree. C., in the presence of catalysts acting as Lewis acids, the catalyst-free ethylene dichloride vapors produced in the evaporative cooling are withdrawn and then condensed and cooled, and liquid catalyst-containing ethylene dichloride is also withdrawn separately.All of the gaseous chlorine input, having a purity of about 90 to 100% by volume, is introduced into a condensed and cooled circulating stream of ethylene dichloride. The ethylene dichloride stream containing chlorine is brought to the reaction pressure, and then catalyst-containing ethylene dichloride withdrawn from the reactor is admixed.
    Type: Grant
    Filed: November 6, 1984
    Date of Patent: November 19, 1985
    Assignee: Dynamit Nobel AG
    Inventors: Hans Leuck, Hans-Jorg Westermann
  • Method for the continuous preparation of alcoholates
    Patent number: 4327230
    Abstract: A process for the continuous production of an alkali metal alcoholate of a higher alcohol which comprises continuously introducing a higher alcohol into a reaction vessel, continuously introducing an alkali metal alcoholate of a lower alcohol into said reaction vessel and continuously and simultaneously distilling over and removing from said reaction vessel lower alcohol which forms.
    Type: Grant
    Filed: March 10, 1980
    Date of Patent: April 27, 1982
    Assignee: Dynamit Nobel AG
    Inventors: Otto Ackermann, Hans Leuck, Gunther Meyer, Gerhard Schmeling