Patents by Inventor Rolf Seubert

Rolf Seubert 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 and device for production of a homogeneous mixture of a vapour-forming aromatic hydrocarbon and an oxygen-containing gas
    Publication number: 20030013931
    Abstract: A process and an apparatus for producing a homogeneous mixture of a gaseous aromatic hydrocarbon and an oxygen-containing gas for catalytic gas-phase reactions, in particular a homogeneous mixture of gaseous o-xylene and/or naphthalene and air for preparing phthalic anhydride, are provided. The liquid aromatic hydrocarbon is atomized to form droplets having a diameter of less than 1 mm and injected into an oxygen-containing gas stream (12) preheated to above the boiling point of the aromatic hydrocarbon. According to the invention, the liquid aromatic hydrocarbon is atomized by means of nozzles (15) which form a hollow cone (16), preferably by means of swirl nozzles. The o-xylene/air mixture is advantageously produced in a chamber which is bounded by side walls (18) heated to above the boiling point of the hydrocarbon.
    Type: Application
    Filed: June 24, 2002
    Publication date: January 16, 2003
    Inventors: Ulrich Block, Rolf Seubert, Bernhard Ulrich, Helmut Wunschmann
  • Preparation of phthalic anhydride from o-xylene
    Patent number: 5225574
    Abstract: Phthalic anhydride is prepared in a multiple tube reactor provided with separate salt baths, the temperature of the salt bath used for cooling the first layer of catalyst, as regarded in the direction of flow of the reaction mixture, being from 2.degree. to 20.degree. C. higher than that of the salt bath(s) associated with the following layer(s).
    Type: Grant
    Filed: April 9, 1991
    Date of Patent: July 6, 1993
    Assignee: BASF Aktiengesellschaft
    Inventors: Heinrich Aichinger, Wilhelm Ruppel, Rolf Seubert, Karl-Heinz Boehning, Walter Scheidmeir, Johannes E. Schmidt, Matthias Schwarzmann
  • Obtaining very pure maleic anhydride from crude maleic anhydride
    Patent number: 4961827
    Abstract: Very pure maleic anhydride having a stable color is obtained by fractional distillation of crude maleic anhydride by a method in which the maleic anhydride vapor separated off from low boilers and high boilers is partially condensed so that from 0.5 to 15% by weight of the maleic anydride vapor is separated off from the vapor phase as a liquid precondensate, and the remaining very pure maleic anhydride vapor is then completely condensed.
    Type: Grant
    Filed: January 22, 1986
    Date of Patent: October 9, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Dieter Zimmerling, Johannes E. Schmidt, Rolf Seubert, Karl Fischer, Friedrich Sauer
  • Obtaining maleic anhydride not prone to discolor
    Patent number: 4921977
    Abstract: Process for obtaining maleic anhydride that is not prone to discolor by treating crude maleic anhydride with oxygen, a gas mixture containing oxygen, or a substance that releases oxygen before or while it is distilled.
    Type: Grant
    Filed: January 4, 1989
    Date of Patent: May 1, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Gerhard Michl, Rolf Seubert, Johannes E. Schmidt
  • Supported catalyst containing vanadium and titanium
    Patent number: 4036783
    Abstract: A supported catalyst containing vanadium and titanium, comprising a ring-shaped carrier having an external diameter of from 7.3 to 8.6 mm, a length of from 5.3 to 7 mm and a wall thickness of from 0.1 to 2 mm, and an active composition, applied thereto, of from 1 to 30 per cent by weight of vanadium pentoxide and from 70 to 99 per cent by weight of titanium dioxide and/or zirconium dioxide.
    Type: Grant
    Filed: February 25, 1976
    Date of Patent: July 19, 1977
    Assignee: BASF Aktiengesellschaft
    Inventors: Kurt Blechschmitt, Peter Reuter, Friedrich Wirth, Gert Buerger, Rolf Seubert