公开(公告)号：DE3328126A1

公开(公告)日：1985-02-21

申请号：DE3328126

申请日：1983-08-04

Applicant: BASF AG

Inventor： SCHMIDT RUDOLF DR ,  MAURER GERD DR ,  DECK HERIBERT

IPC: C07B61/00 ,  C07D323/06

公开(公告)号：DE3060960D1

公开(公告)日：1982-11-25

申请号：DE3060960

申请日：1980-04-03

Applicant: BASF AG

Inventor： WOLF DIETER DR ,  SCHMIDT RUDOLF DR ,  BLOCK ULRICH DR ,  SCHOENMAKERS HARTMUT DR ,  BOTT KASPAR DR ,  KAIBEL GERD

IPC: C07C53/02 ,  C07C27/02 ,  C07C51/00 ,  C07C51/09 ,  C07C51/42 ,  C07C51/44 ,  C07C51/48 ,  C07C67/00

Abstract: Anhydrous or substantially anhydrous formic acid is obtained by hydrolysis of methyl formate, in a process wherein (a) methyl formate is hydrolyzed, (b) the methanol and excess methyl formate are distilled from the hydrolysis mixture obtained, (c) the bottom product of distillation (b), consisting of formic acid and water, is extracted, in a liquid-liquid extraction, with an extractant which in the main takes up the formic acid, (d) the resulting extract phase, consisting of formic acid, the extractant and a part of the water, is subjected to distillation, (e) the top product obtained from this distillation and consisting of all or part of the water introduced into the distillation, and part of the formic acid, is recycled, as vapor, into the lower part of the distillation column of stage (b), (f) the bottom product of distillation stage (d), consisting of the extractant, with or without part of the water, and the greater part of the formic acid, is separated by distillation into anhydrous or substantially anhydrous formic acid and the extractant, and (g) the extractant leaving stage (f) is recycled to the process.

公开(公告)号：DE3483858D1

公开(公告)日：1991-02-07

申请号：DE3483858

申请日：1984-07-26

Applicant: BASF AG

Inventor： SCHMIDT RUDOLF DR ,  MAURER GERD DR ,  DECK HERIBERT

IPC: C07B61/00 ,  C07D323/06

公开(公告)号：DE3820737A1

公开(公告)日：1989-12-21

申请号：DE3820737

申请日：1988-06-18

Applicant: BASF AG

Inventor： FUCHS HUGO DR ,  PITSCHMANN PETER DR ,  SCHMIDT RUDOLF DR

IPC: C07D201/16 ,  C07D223/10

Abstract: Caprolactam is recovered from aqueous solutions by extraction by a) extracting the aqueous solution of caprolactam under a pressure of 100 to 500 bar and at a temperature of 0 to 50@C with an inert water-immiscible extracting agent which is present at 0@C in the gaseous state and under extraction conditions in the liquid or supercritical state, b) separating off the aqueous phase and obtaining a caprolactam-containing extract, c) converting the extracting agent from the caprolactam-containing extract into the gaseous state by warming and/or depressurising and separating off caprolactam and d) recycling the gaseous extracting agent to stage a).