公开(公告)号：DE3337389A1

公开(公告)日：1985-04-25

申请号：DE3337389

申请日：1983-10-14

Applicant: BASF AG

Inventor： BRUNNMUELLER FRITZ DR ,  SCHNEIDER ROLF DR ,  SCHUSTER WERNER ,  VILHUBER HEINZ GEORG DR ,  KARL FRITZ

IPC: C07H3/04 ,  C07H13/04 ,  C07H13/06 ,  C07H1/06

公开(公告)号：DE2947828A1

公开(公告)日：1981-07-30

申请号：DE2947828

申请日：1979-11-28

Applicant: BASF AG

Inventor： DISTLER HARRY DIPL CHEM DR ,  KARL FRITZ

IPC: C01C3/02

Abstract: Working up recycled formamide (I) in the mfr. of HCN from (I) by the vacuum process, using excess (I), involves passing the ammoniacal soln. of water of reaction in (I) sepd. from the reaction gases, directly after leaving the reaction furnace, downwards into a steam stripping column, in countercurrent to 5-20 wt.% steam, so that practically all the NH3 and most of the water are removed. The formation of HCN polymers in (I) is largely avoided. The process is carried out at reduced pressure.