Patents by Inventor Doris Zschieschang

Doris Zschieschang 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).

  • Acidic sludge adsorption of DNT wastewaters
    Patent number: 8529771
    Abstract: A process for working up alkaline process wastewater from the nitration of aromatic compounds to mono-, di- and trinitroaromatics, said alkaline process wastewater having a pH of 7.5 to 13, comprising the steps of a) acidifying the alkaline process wastewater by adding concentrated sulfuric acid which originates from the workup of the aqueous, sulfuric acid-containing phase obtained in the nitration to a pH below 5, which forms a mixture A consisting of organic phase which separates out and acidic aqueous phase, b) contacting the mixture A with fresh sewage sludge, and c) removing the sewage sludge.
    Type: Grant
    Filed: December 13, 2010
    Date of Patent: September 10, 2013
    Assignee: BASF SE
    Inventors: Ruediger Fritz, Renate Hempel, Michael Zoellinger, Anne-Kathrin Merten, Doris Zschieschang, Ina Homann, Annett Gersdorf, Holger Allardt, Reiner Reetz, Elvira Flegel
  • ACIDIC SLUDGE ADSORPTION OF DNT WASTEWATERS
    Publication number: 20120234773
    Abstract: A process for working up alkaline process wastewater from the nitration of aromatic compounds to mono-, di- and trinitroaromatics, said alkaline process wastewater having a pH of 7.5 to 13, comprising the steps of a) acidifying the alkaline process wastewater by adding concentrated sulfuric acid which originates from the workup of the aqueous, sulfuric acid-containing phase obtained in the nitration to a pH below 5, which forms a mixture A consisting of organic phase which separates out and acidic aqueous phase, b) contacting the mixture A with fresh sewage sludge, and c) removing the sewage sludge.
    Type: Application
    Filed: December 13, 2010
    Publication date: September 20, 2012
    Applicant: BASF SE
    Inventors: Ruediger Fritz, Renate Hempel, Michael Zoellinger, Anne-Kathrin Merten, Doris Zschieschang, Ina Homann, Annett Gersdorf, Holger Allardt, Reiner Reetz, Elvira Flegel