公开(公告)号：EP2794540A1

公开(公告)日：2014-10-29

申请号：EP12791502.3

申请日：2012-11-29

Applicant: BASF SE

Inventor： BASLER, Peter ,  RITTINGER, Stefan ,  SCHNEIDER, Daniel ,  FRIES, Donata Maria ,  MOHL, Klaus-Dieter ,  TELES, Joaquim Henrique ,  SCHÄFER, Martin ,  PASCHOLD, Jürgen

IPC: C07C51/09 ,  C07C51/44 ,  C07C51/50 ,  C07C53/02

CPC classification number: C07C51/44 ,  C07C51/02 ,  C07C51/412 ,  C07C53/02 ,  C07C53/06

Abstract: Process for obtaining formic acid by thermal separation of a stream comprising formic acid and a tertiary amine (I), in which a liquid stream comprising formic acid and tertiary amine (I) is produced by combining tertiary amine (I) and a formic acid source, secondary components comprised therein are separated off, formic acid is removed by distillation from the resulting liquid stream in a distillation apparatus, where the bottom output from the distillation apparatus is separated into two liquid phases, and the upper liquid phase is recirculated to the formic acid source and the lower liquid phase is recirculated to the separation of the secondary components and/or to the distillation apparatus, wherein low boilers are removed by distillation from the upper liquid phase and recirculated to the depleted stream.

公开(公告)号：EP1562896B1

公开(公告)日：2011-02-02

申请号：EP03773710.3

申请日：2003-11-11

Applicant: BASF SE

Inventor： FISCHER, Rolf-Hartmuth ,  LUYKEN, Hermann ,  ANSMANN, Andreas ,  BASLER, Peter ,  BENISCH, Christoph ,  MAIXNER, Stefan ,  MELDER, Johann-Peter

IPC: C07D201/16 ,  C07D201/08

CPC classification number: C07D201/16 ,  C07D201/08

Abstract: The invention relates to a method for separating high boilers out from a crude caprolactam, which contains high boilers, caprolactam and, optionally, light boilers, and which has been obtained by: a) reacting 6-aminocapronitrile with water to form a reaction mixture, and; b) separating ammonia and unreacted water out from the reaction mixture while obtaining a crude caprolactam. The invention is characterized in that: c) the crude caprolactam is fed to a distillation device while obtaining, as a product, a first partial flow via the top, and obtaining a second partial flow via the bottom. During distillation, the pressure is set so that a bottom temperature of 170 °C is not fallen below, and the second partial flow is set so that the caprolactam content of the second partial flow is no less than 10 % by weight with regard to the entire second partial flow.