公开(公告)号：DE2853991A1

公开(公告)日：1980-07-03

申请号：DE2853991

申请日：1978-12-14

Applicant: BASF AG

Inventor： BOTT KASPAR DIPL CHEM DR ,  KAIBEL GERD DIPL ING ,  HOFFMANN HERWIG DIPL CHEM DR ,  KRATZER OTTO DIPL CHEM DR ,  IRNICH RUDOLF DIPL CHEM DR

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

Abstract: A process for the production of anhydrous or substantially anhydrous formic acid by hydrolysis of methyl formate which is carried out in a column having an upper fractionating section, a middle hydrolysis section and a lower extraction section and in which (a) the hydrolysis is carried out in the middle section of the columm, with water and methyl formate in countercurrent, (b) the resulting formic acid is extracted, in the lower section of the column, by means of a carboxylic acid amide which is fed into the lower end of the middle section of the column, (c) the extract phase, consisting in the main of formic acid and the carboxylic acid amide, is distillatively dehydrated, or substantially dehydrated, in the lower section of the column, (d) the methanol and uncovered methyl formate are removed by fractional distillation in the upper section of the column and (e) the pure formic acid or concentrated aqueous formic acid is distilled from the anhydrous or substantially anhydrous extract phase in a second column, leaving the carboxylic acid amide.

公开(公告)号：DE3151039A1

公开(公告)日：1983-07-28

申请号：DE3151039

申请日：1981-12-23

Applicant: BASF AG

Inventor： HOFFMANN HERWIG DIPL CHEM DR ,  IRNICH RUDOLF DIPL CHEM DR ,  SACHSZE WERNER DIPL CHEM DR ,  REUTEMANN WERNER DIPL ING

IPC: C07C51/06 ,  C07C53/02

Abstract: Preparation of formic acid by hydrolysis of formamide with water and sulphuric acid, followed by drying of the resulting moist mixture mainly consisting of ammonium sulphate and formic acid in a rotary kiln, by using in this process 0.517 to 0.541 mol of sulphuric acid per mole of formamide.

公开(公告)号：DE3106054A1

公开(公告)日：1982-09-02

申请号：DE3106054

申请日：1981-02-19

Applicant: BASF AG

Inventor： BOTT KASPAR DIPL CHEM DR ,  KAIBEL GERD ,  HOFFMANN HERWIG DIPL CHEM DR ,  IRNICH RUDOLF DIPL CHEM DR ,  KRATZER OTTO DIPL CHEM DR

IPC: C07C231/02 ,  C07C20060101 ,  C07C67/00 ,  C07C231/00 ,  C07C233/03 ,  C07C103/127 ,  C07C102/06

公开(公告)号：DE3019767A1

公开(公告)日：1981-12-03

申请号：DE3019767

申请日：1980-05-23

Applicant: BASF AG

Inventor： BOTT KASPAR DIPL CHEM DR ,  KAIBEL GERD DIPL ING ,  HOFFMANN HERWIG DIPL CHEM DR ,  IRNICH RUDOLF DIPL CHEM DR ,  SCHAEFER EBERHARD

IPC: C07C67/03 ,  B01D3/36 ,  C07C67/02 ,  C07C69/14

Abstract: A process for the preparation of acetic acid esters CH3-CO-O-R1 (I, R1=an organic radical other than methyl and ethyl) by alkali-catalyzed trans-esterification of an acetic acid ester CH3-CO-O-R2 (II, R2=methyl or ethyl) with an alcohol R1-OH (III), accompanied by elimination of the alcohol R2-OH (IV), wherein (a) the trans-esterification reaction is carried out in the middle section KM of a distillation column K, the alcohol III being fed as liquid into the upper zone and the ester II into the lower zone of KM, (b) the alkaline catalyst is introduced into the upper part KU of K, (c) the alcohol IV, or a mixture of IV and the ester II, is taken off the top of the column, (d) the mixture obtained from (c) (unless the alcohol IV alone is obtained) is separated in the column section KU or in a stripper column KS into IV and the azeotrope of II and IV, and the latter is recycled to the lower zone of KM, (e) the ester I is taken as vapor or liquid from the lower zone of the lower section KL of K and (f) the catalyst is either removed, or recycled to KU, in a conventional manner.

公开(公告)号：DE2706684A1

公开(公告)日：1978-08-24

申请号：DE2706684

申请日：1977-02-17

Applicant: BASF AG

Inventor： HIMMELE WALTER DIPL CHEM DR ,  FISCHER KARL DIPL CHEM DR ,  KAIBEL GERD DIPL ING ,  SCHNEIDER KURT DIPL CHEM DR ,  IRNICH RUDOLF DIPL CHEM DR

IPC: B01D3/40 ,  C07C68/06 ,  C07C68/08 ,  C07C69/00 ,  C07C69/96

Abstract: Dimethyl carbonate is obtained pure, from its solutions in methanol, by extractive distillation carried out with a temperature of from 60 DEG C. at the top to 250 DEG C. at the bottom of the column and employing, as the extractant, an aprotic organic liquid which is substantially inert toward dimethyl carbonate, boils at above 100 DEG C. at standard pressure, is miscible with dimethyl carbonate in all proportions and has a dielectric constant epsilon of from 4 to 90 and a dipole moment mu of from 1.5 to 5 Debye.