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    Production of anhydrous formic acid involves hydrolysis of methyl formate followed by distillation, extraction with amide and further distillations, using the amide also as a foam suppressant in first distillation stage
    22.
    发明专利
    Production of anhydrous formic acid involves hydrolysis of methyl formate followed by distillation, extraction with amide and further distillations, using the amide also as a foam suppressant in first distillation stage 未知

    公开(公告)号：DE10002793A1

    公开(公告)日：2001-07-26

    申请号：DE10002793

    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 ,  C07C51/09 ,  C07C51/44 ,  C07C51/48 ,  C07C53/02 ,  B01D19/04 ,  C07C233/05

    Abstract: In the production of anhydrous formic acid by hydrolysis of methyl formate followed by distillation, extraction of the bottom product with an amide extractant (I) and further distillation stages, a part-stream of (I) is taken out and fed into the first distillation column at a point between the inlet for the hydrolysis mixture and the methanol take-off point. A process for 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 from stage (vi). In this process, part of the extractant (I) is taken off and fed into the distillation unit for stage (ii) at a point above the inlet for the hydrolysis mixture and below the take-off point for methanol. 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 column (2) for stage (ii), a distillation column (4) for stage (iv), an extraction unit (3), a distillation column (5) for stage (vi) and a connecting line (8) for transferring a part-stream of extractant (I) to distillation column (2).

    28.
    发明专利
    未知

    公开(公告)号：DE50301577D1

    公开(公告)日：2005-12-08

    申请号：DE50301577

    申请日：2003-07-07

    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.

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