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    Process for the preparation of glycolide and lactide
    12.
    发明专利
    Process for the preparation of glycolide and lactide 未知

    公开(公告)号：DE4318456A1

    公开(公告)日：1994-12-08

    申请号：DE4318456

    申请日：1993-06-03

    Applicant: BASF AG

    Inventor： KRATZ DETLEF DR ,  BRUDERMUELLER MARTIN DR ,  WITZEL TOM DR

    IPC: C07D319/12

    Abstract: Glycolide (Ia) or lactides (Ib) are prepared by thermocatalytic cleavage of condensation products of glycolic acid or, respectively, an alpha -hydroxypropionic acid while removing Ia or Ib, respectively, from the reaction mixture by distillation, converting the distillate into the solid phase by cooling, and purifying the resulting crude product by washing it with an ether having 4 to 12 carbon atoms.

    14.
    发明专利
    未知

    公开(公告)号：DE4134497A1

    公开(公告)日：1993-04-22

    申请号：DE4134497

    申请日：1991-10-18

    Applicant: BASF AG

    Inventor： MERGER FRANZ DR ,  BRUDERMUELLER MARTIN DR ,  SCHMIDT-RADDE MARTIN DR

    IPC: C07C29/141 ,  C07C29/145 ,  C07C33/46 ,  C07C41/18 ,  C07C43/174

    Abstract: Process for the preparation of 4-halobenzyl alcohols of the general formula I … … in which …… R represents hydrogen, C1- to C20-alkyl, C2- to C20-alkoxyalkyl, C3- to C20-cycloalkyl, C4- to C30-cycloalkylalkyl, … R represents C1- to C20-alkyl, C2- to C20-alkoxyalkyl, C3- to C20-cycloalkyl, C4- to C30-cycloalkylalkyl, … X represents halogen and … m represents 0 to 2, … in which haloaromatic carbonyl compounds of the formula II … … in which the substituents R , R and X and the index m have the abovementioned meaning, are reacted with hydrogen in the presence of an amine on copper catalysts at 50 to 130 DEG C and pressures of 10 to 200 bar, if appropriate in the presence of an inert solvent.

    15.
    发明专利
    未知

    公开(公告)号：DE19542036A1

    公开(公告)日：1997-05-15

    申请号：DE19542036

    申请日：1995-11-10

    Applicant: BASF AG

    Inventor： KRATZ DETLEF DR ,  STAMMER ACHIM DR ,  WITZEL TOM DR ,  BRUDERMUELLER MARTIN DR

    IPC: C07C27/02 ,  C07C29/09 ,  C07C29/128 ,  C07C29/38 ,  C07C31/22 ,  C07C35/08 ,  C07C67/02 ,  C07C67/08 ,  C07C67/44 ,  C07C69/06 ,  C07C31/18 ,  C07C29/74 ,  C07C69/04

    Abstract: The invention relates to a process for the preparation of polyalcohols comprising the following stages: (a) reaction of an alcanal or ketone with formaldehyde in an aqueous solution in the presence of a tertiary amine; (b) separation of water, excess tertiary amine, excess formaldehyde; (c) heating of the remaining mixture of (b) separating further formaldehyde and tertiary amine and formation of polyalcohol formates; (d) conveying of tertiary amine separated from stage (b) and/ or stage (c) into the synthesis stage (a) and/or into the following transesterification stage (e); (e) transesterification of the polyalcohol formates obtained from stage (c) with an alcohol of the formula ROH in the presence of a transesterification catalyst to form polyalcohols and formates of the formula (I), R being a hydrocarbon radical, preferably an alkyl radical with 1-6, in particular preferably 1-2 C-atoms; (f) retrieval of polyalcohols.

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