Patents Represented by Law Firm Kiel, Thompson & Shurtleff
  • Purification of formic acid by extractive distillation
    Patent number: 4076594
    Abstract: Formic acid is purified by extractive distillation of its aqueous solutions using a basic extractant, followed by distillation of the bottom mixture first obtained, the extractant used being N-formylmorpholine.
    Type: Grant
    Filed: October 4, 1976
    Date of Patent: February 28, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Horst Buelow, Heinz Hohenschutz, Johannes E. Schmidt, Werner Sachsze