Patents by Inventor Klaus Althaus

Klaus Althaus 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 the purification of dimethylacetamide (DMAc)
    Patent number: 7547378
    Abstract: The invention relates to a process for distillatively purifying crude dimethylacetamide (crude DMAc) comprising DMAc, low boilers and high boilers 5 by removing the low boilers and the high boilers to obtain pure DMAc in one of the column configurations listed hereinbelow: (I) a main column (MC) with sidestream column (SC) or (II) a dividing wall column (DWC), which operating at least the main column (MC) in column configuration (I) and the dividing wall column (DWC) in column configuration (II) at a top pressure in the range from 0.5 to 1.8 bar absolute.
    Type: Grant
    Filed: April 5, 2004
    Date of Patent: June 16, 2009
    Assignee: BASF Aktiengesellschaft
    Inventors: Werner Peschel, Hartmut Schoenmakers, Klaus Althaus, Tanja Kirchner, Hartmut Staatz
  • Method for the purification of dimethylacetamide (dmac)
    Publication number: 20060219545
    Abstract: The invention relates to a process for distillatively purifying crude dimethylacetamide (crude DMAc) comprising DMAc, low boilers and high boilers 5 by removing the low boilers and the high boilers to obtain pure DMAc in one of the column configurations listed hereinbelow: (I) a main column (MC) with sidestream column (SC) or (II) a dividing wall column (DWC), which comprises operating at least the main column (MC) in column configuration (I) and the dividing wall column (DWC) in column configuration (II) at a top pressure in the range from 0.5 to 1.8 bar absolute.
    Type: Application
    Filed: April 5, 2004
    Publication date: October 5, 2006
    Applicant: BASF AKTIENGESELLSCHAFT
    Inventors: Werner Peschel, Hartmut Schoenmakers, Klaus Althaus, Tanja Kirchner, Hartmut Staatz