Patents by Inventor Siegfried Kruger

Siegfried Kruger 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: 6066232
    Abstract: The invention relates to a process for evaporating a liquid containing vaporizable oxidation-sensitive compounds in an evaporator in which the liquid is brought into contact with a heated solid surface for evaporation, by a process in which direct contact between the resulting vapor phase and the heated solid surface is substantially avoided. It also directed to an evaporator composed of a heatable solid surface (16), an apparatus (2, 3) for heating the solid surface and an apparatus (10) for feeding a liquid containing vaporizable compounds to the heatable solid surface, wherein the apparatus for feeding the liquid is designed and arranged in the evaporator in such a way (12, 14, 18) that direct contact between a resulting vapor phase and the heatable solid surface is substantially avoided.
    Type: Grant
    Filed: July 24, 1998
    Date of Patent: May 23, 2000
    Assignee: BASF Aktiengesellschaft
    Inventors: Jurgen Mohr, Frans Vansant, Axel Werner Polt, Stephan Scholl, Siegfried Kruger, Hartmut Staatz
  • Patent number: 6048441
    Abstract: Neopentyl glycol hydroxypivalate (NGH) is isolated from a mixture containing NGH, lower- and higher-boiling products and inorganic salts and purified in a two-stage process, whereinin a first separation stage, the inorganic salts and part of the higher-boiling products are separated off in a wiped-film evaporator and a vapor stream consisting of NGH, lower- and higher-boiling products is discharged and fed to a heat exchanger and condensed therein,and, in a second separation stage, the resulting condensate is distilled in a rectification column from which NGH is taken off in a side stream and condensed. Further discharges of the rectification column containing lower-boiling products or higher-boiling products are separately taken off. The higher-boiling products which comprise residual NGH are partly or completely recycled to the lower region of the rectification column.
    Type: Grant
    Filed: July 24, 1998
    Date of Patent: April 11, 2000
    Assignee: BASF Aktiengesellschaft
    Inventors: Heinz Auer, Siegfried Kruger, Stephan Scholl, Theodor Weber, Johann-Peter Melder