Patents by Inventor Ulrich Girrbach

Ulrich Girrbach 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).

  • Process for the selective absorption of chlorine and/or bromine from CO.sub. -containing off-gases with the aid of steam
    Patent number: 5124135
    Abstract: The invention provides a process for the selective absorption of chlorine and/or bromine from CO.sub.2 -containing off-gases. The off-gas must contain at least 1 mol of SO.sub.2 per mol of Cl.sub.2 and/or per mol of Br.sub.2 ; if necessary sufficient SO.sub.2 is added to the off-gas to give the above-mentioned relative amount. Chlorine and/or bromine is absorbed by mixing the off-gas with steam and then cooling the mixture until the steam condenses. An example of a suitable apparatus is a vertical tube having an internal cooling coil.
    Type: Grant
    Filed: October 28, 1991
    Date of Patent: June 23, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Ulrich Girrbach, Edgar Hartl, Egon Malow
  • Process for the selective absorption of chlorine from CO.sub.2 -containing off-gases
    Patent number: 5102638
    Abstract: The invention provides a process for the selective absorption of chlorine from CO.sub.2 -containing off-gases, which comprises washing the off-gases with an aqueous solution which contains 0.1-10% by weight of NaHCO.sub.3 and 0.01-5% by weight of NaHSO.sub.3.
    Type: Grant
    Filed: June 29, 1990
    Date of Patent: April 7, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Ulrich Girrbach, Richard Grimm, Edgar Hartl, Egon Malow
  • Process for the separation and recovery of naphthalene-sulfonic acids from aqueous solutions
    Patent number: 5028736
    Abstract: The invention relates to a process for the separation and recovery of naphthalenesulfonic acids from aqueous solutions. In this, the naphthalenesulfonic acids are adsorbed on basic ion exchangers and subsequently desorbed again, preferably with the aid of an alkaline liquor, from which the alkali metal sulfonates are then precipitated by cooling.
    Type: Grant
    Filed: May 24, 1990
    Date of Patent: July 2, 1991
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Ulrich Girrbach, Siegbert Rittner, Siegfried Bildstein, Klaus Schmiedel