Patents by Inventor Steffen Kerth

Steffen Kerth 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 producing an aqueous hydroxylamine solution devoid of salt
    Patent number: 7105078
    Abstract: A process for preparing a salt-free aqueous hydroxylamine solution by reacting an aqueous solution of a hydroxylammonium salt with a base to give a mixture and separating from said mixture by distillation a salt-free aqueous hydroxylamine solution, involving using as a base an aqueous solution of a mixture of NaOH and KOH in a molar ratio Na+:K+ in the range from 70:30 to 95:5 and with a total concentration of Na+ and K+ in the range from 0.1 to 10 m/m % based on the total amount of the mixture.
    Type: Grant
    Filed: July 2, 2002
    Date of Patent: September 12, 2006
    Assignee: BASF Aktiengesellschaft
    Inventors: Karl-Heinz Wostbrock, Eckhard Ströfer, Markus Weber, Steffen Kerth
  • Method for producing an aqueous hydroxylamine solution devoid of salt
    Patent number: 7029557
    Abstract: The invention relates to a method for producing a highly pure, aqueous hydroxylamine solution by distilling an aqueous solution, devoid of salt, of a hydroxyl ammonium salt in a plate column comprising at least two mechanical plates. Said method is characterised in that packing bodies are arranged between at least two plates of the plate column over the cross-section of said column.
    Type: Grant
    Filed: July 2, 2002
    Date of Patent: April 18, 2006
    Assignee: BASF Aktiengesellschaft
    Inventors: Karl-Heinz Wostbrock, Joachim Thiel, Heinz Krüger, Eckhard Ströfer, Markus Weber, Bernd Gerber, Bernd Rumpf, Bernd Sachweh, Steffen Kerth
  • Method for the production of a salt-free aqueous hydroxylamine solution
    Patent number: 6942762
    Abstract: A process for preparing a salt-free aqueous hydroxylamine solution by distilling an aqueous solution of a hydroxylammonium salt and a base in a tray column having at least two mechanical trays, wherein random or structured packings are located above at least one tray of the tray column over the cross section of the column.
    Type: Grant
    Filed: July 2, 2002
    Date of Patent: September 13, 2005
    Assignee: BASF Akteingesellschaft
    Inventors: Karl-Heinz Wostbrock, Joachim Thiel, Heinz Krüger, Eckhard Ströfer, Markus Weber, Bernd Gerber, Bernd Rumpf, Bernd Sachweh, Steffen Kerth
  • Method for the production of a salt-free aqueous hydroxylamine solution
    Publication number: 20040156774
    Abstract: The invendon relates to a method for the production of a salt-free aqueous hydroxylamine solution by distilling an aqueous solution of an hydroxylammonium salt and a base in a plate column having at least two mechanical plates. The invention is characterized in that packings or structured packings are placed above at least one of the plates of the plate column along the cross section of said column.
    Type: Application
    Filed: December 30, 2003
    Publication date: August 12, 2004
    Inventors: Karl-Heinz Wostbrock, Joachim Thiel, Heinz Kruger, Eckhard Strofer, Markus Weber, Bernd Gerber, Bernd Rumpf, Bernd Sachweh, Steffen Kerth
  • Method for producing an aqueous hydroxylamine solution devoid of salt
    Publication number: 20040149564
    Abstract: The invention relates to a method for producing a highly pure, aqueous hydroxylamine solution by distilling an aqueous solution, devoid of salt, of a hydroxyl ammonium salt in a plate column comprising at least two mechanical plates. Said method is characterised in that packing bodies are arranged between at least two plates of the plate column over the cross-section of said column.
    Type: Application
    Filed: December 30, 2003
    Publication date: August 5, 2004
    Inventors: Karl-Heinz Wostbrock, Joachim Thiel, Heinz Kruger, Eckhard Strofer, Markus Weber, Bernd Gerber, Bernd Rumpf, Bernd Sachweh, Steffen Kerth
  • Method for producing an aqueous hydroxylamine solution devoid of salt
    Publication number: 20040149563
    Abstract: A process for preparing a salt-free aqueous hydroxylamine solution by reacting an aqueous solution of a hydroxylammonium salt with a base to give a mixture and separating from said mixture by distillation a salt-free aqueous hydroxylamine solution, comprises using as a base an aqueous solution of a mixture of NaOH and KOH in a molar ratio Na+:K+ in the range from 70:30 to 95:5 and with a total concentration of Na+ and K+ in the range from 0.1 to 10 m/m % based on the total amount of the mixture.
    Type: Application
    Filed: December 30, 2003
    Publication date: August 5, 2004
    Inventors: Karl-Heinz Wostbrock, Eckhard Strofer, Markus Weber, Steffen Kerth