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    5.
    发明专利
    未知

    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.

    6.
    发明专利
    未知

    公开(公告)号：DE2914671A1

    公开(公告)日：1980-10-23

    申请号：DE2914671

    申请日：1979-04-11

    Applicant: BASF AG

    Inventor： WOLF DIETER DIPL ING DR ,  SCHMIDT RUDOLF DIPL ING DR ,  BLOCK ULRICH DIPL ING DR ,  SCHOENMAKERS HARTMUT DIPL PHYS ,  BOTT KASPAR DIPL CHEM DR ,  KAIBEL GERN DIPL ING

    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.

    8.
    发明专利
    未知

    公开(公告)号：DE3113880A1

    公开(公告)日：1982-10-21

    申请号：DE3113880

    申请日：1981-04-07

    Applicant: BASF AG

    Inventor： BOTT KASPAR DIPL CHEM DR

    IPC: C07D473/12

    Abstract: Caffeine is prepared from theophylline, carbon monoxide and methanol.

    9.
    发明专利
    未知

    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.

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