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    METHOD FOR EXTRACTING 2-KETONE-L-GULONIC ACID FROM A POLAR, PREFERABLY AQUEOUS SOLVENT
    61.
    发明专利
    METHOD FOR EXTRACTING 2-KETONE-L-GULONIC ACID FROM A POLAR, PREFERABLY AQUEOUS SOLVENT 未知

    公开(公告)号：CA2510026A1

    公开(公告)日：2004-07-08

    申请号：CA2510026

    申请日：2003-12-13

    Applicant: BASF AG

    Inventor： DOMSCHKE THOMAS ,  MERGER MARTIN ,  SAUER FRIEDRICH ,  DECKERT PETRA

    IPC: C07H1/06 ,  C07H7/027

    Abstract: The invention relates to a method for extracting 2-ketone-L-gulonic acids fr om a polar, preferably aqueous solvent, preferably from a solvent which contain s a mixture of ascorbic acid and 2-ketone-L-gulonic acid, by means of liquid- liquid extraction with the aid of an extraction agent which contains a tertiary amine and a polar organic diluent. Preferably, the inventive method also comprises steps for retro-extracting the 2-ketone-L-gulonic acid and fo r returning the extraction agent. The invention also relates to a method for producing ascorbic acid from 2-ketone-L-gulonic acid and for isolating the thus produced ascorbic acid.

    62.
    发明专利
    未知

    公开(公告)号：DE10231890A1

    公开(公告)日：2004-02-05

    申请号：DE10231890

    申请日：2002-07-12

    Applicant: BASF AG

    Inventor： KAIBEL GERD ,  MERGER MARTIN ,  DOMSCHKE THOMAS ,  DECKERT PETRA ,  SAUER FRIEDRICH

    IPC: C07D307/62

    Abstract: The invention relates to a method for the separation of ascorbic acid from a mixture containing ascorbic acid and 2-keto-L-gulonic acid in a polar, preferably aqueous solvent, by means of liquid/liquid extraction using an amide. The method preferably also comprises steps for the back-extraction of the ascorbic acid, recycling of the extraction solvent and/or the back extraction solvent and for isolation of the ascorbic acid from the back extraction solvent. The invention further relates to a method for the production of ascorbic acid from KGA and isolation of the ascorbic acid so produced.

    66.
    发明专利
    未知

    公开(公告)号：NO20023514D0

    公开(公告)日：2002-07-23

    申请号：NO20023514

    申请日：2002-07-23

    Applicant: BASF AG

    Inventor： AUER HEINZ ,  BESSLING BERND ,  HAMMER HANS ,  HASSE HANS ,  SAUER FRIEDRICH ,  VICARI MAXIMILIAN ,  ADRIAN TILL

    IPC: C07C51/09 ,  C07C51/44 ,  C07C51/48 ,  C07C53/02 ,  C07C

    Abstract: The invention relates to a process for obtaining anhydrous or substantially anhydrous formic acid, in which firstly aqueous formic acid is produced by hydrolysis of methyl formate, with the methanol content in the methyl formate having been reduced in advance. The process according to the invention has the special feature that-before the hydrolysis of the methyl formate-the methanol content of the methanol-containing methyl formate is reduced in a distillation column, this distillation column simultaneously being employed for other separation functions during work-up of the formic acid.

    Production of anhydrous formic acid involves hydrolysis of methyl formate followed by distillation, extraction with amide and further distillation stages, using the same extractant to wash useful products out of the off-gas
    68.
    发明专利
    Production of anhydrous formic acid involves hydrolysis of methyl formate followed by distillation, extraction with amide and further distillation stages, using the same extractant to wash useful products out of the off-gas 未知

    公开(公告)号：DE10002790A1

    公开(公告)日：2001-07-26

    申请号：DE10002790

    申请日：2000-01-24

    Applicant: BASF AG

    Inventor： AUER HEINZ ,  BESLING BERND ,  HAMMER HANS ,  HASSE HANS ,  SAUER FRIEDRICH ,  VICARI MAXIMILIAN ,  WAGNER GERHARD ,  ADRIAN TILL

    IPC: C07C51/56 ,  B01J14/00 ,  C07C51/09 ,  C07C51/44 ,  C07C51/48 ,  C07C53/02 ,  C07C233/01

    Abstract: In the production of anhydrous formic acid (FA) by hydrolysis of methyl formate (MF) followed by distillation, extraction of the bottom product with an amide extractant (I) and further distillation stages, the off-gas streams containing MF and/or methanol and/or FA are washed with (I) which is then returned to the process along with these products in solution. The production of (essentially) anhydrous formic acid (FA) involves: (i) hydrolysis of methyl formate (MF), (ii) removal of methanol and excess MF by distillation, (iii) liquid-liquid extraction of the bottom product with an amide of formula R (R )NC(O)R (I), (iv) distillation of the extract, (v) recycling the top product from (iv) (containing water and some FA) to the lower part of the distillation column used in stage (ii), (vi) separation of the bottom product from (iv) by distillation into anhydrous FA and extractant (I) and (vii) recycling (I) into the process. In this process, the off-gas streams containing MF and/or methanol and/or FA are washed with extractant (I), which is then returned to the process along with dissolved MF and/or methanol and/or FA. R , R = alkyl, cycloalkyl, aryl or aralkyl, or R plus R plus the linking nitrogen may form a 5- or 6-membered heterocycle, with the proviso that only one of these groups is aryl; R = H or 1-4C alkyl An Independent claim is also included for the apparatus used for this process, comprising a synthesis reactor (6), a hydrolysis reactor (1), a distillation system (2) for stage (ii), a distillation system (4) for stage (iv), an extraction unit (3), a distillation system (5) for stage (vi) and an off-gas scrubber (9).

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