Patents Assigned to The Dow Chemical Company, Legal Department, Intellectual Property Section
  • Separation of propylene oxide from a mixture comprising propylene oxide and methanol
    Patent number: 7323579
    Abstract: A method of separating propylene oxide from a mixture (M) comprising 5 to 50 percent by weight propylene oxide and 50 to 85 percent by weight methanol, said method comprising (i) introducing said mixture (M) into an extractive distillation column; (ii) additionally introducing a polar solvent into said extractive distillation column; (iii) distilling propylene oxide overhead from said extractive distillation column at a bottoms temperature of from 40 to 70° C. and at a pressure of from 300 to 750 mbar.
    Type: Grant
    Filed: July 7, 2004
    Date of Patent: January 29, 2008
    Assignees: BASF Aktiengesellschaft, The Dow Chemical Company Legal Department Intellectual Property Section
    Inventors: Hans-Georg Göbbel, Henning Schultz, Peter Schultz, Renate Patrascu, Malte Schulz, Meinolf Weidenbach
  • Method of separating an olefin from a gas stream
    Patent number: 7223876
    Abstract: The present invention relates to a method of separating an olefin from a gas stream, said gas stream comprising the olefin and at least one other component, said method comprising (i) compressing and cooling the gas stream; (ii) separating the olefin from the gas stream by absorbing the olefin in an absorbent; (iii) separating the olefin from the absorbent by desorption; wherein compressing or cooling or compressing and cooling in (i) is carried out at least twice.
    Type: Grant
    Filed: April 21, 2004
    Date of Patent: May 29, 2007
    Assignees: BASF Aktiengesellschaft, The Dow Chemical Company, Legal Department, Intellectual Property Section
    Inventors: Hans-Georg Göbbel, Henning Schultz, Peter Schultz, Renate Patrascu, Malte Schulz, Meinolf Weidenbach