公开(公告)号：DE2407157A1

公开(公告)日：1975-09-11

申请号：DE2407157

申请日：1974-02-15

Applicant: BASF AG

Inventor： HOHENSCHUTZ HEINZ DR ,  STROHMEYER MAX DR ,  RAUCH KONRAD DR ,  HESSE DIETER DIPL ING ,  KIEFER HANS DR

IPC: C07C53/02 ,  C07C51/00 ,  C07C51/44 ,  C07C67/00 ,  C07C51/46

Abstract: Formic acid is isolated from mixtures containing formic acid, methyl formate, methanol and water by fractional distillation, the mixture being fed into the upper half of the distillation column and 5 to 15 theoretical plates being maintained above the feed point and 10 to 25 theoretical plates below the feed point. The formic acid is withdrawn at the bottom end of the column as an azeotrope with water, the azeotrope being in the liquid state or preferably in the vapor state.