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    PROCESS FOR PREPARING ALKYL ESTERS OF (METH)ACRYLIC ACID
    2.
    发明专利
    PROCESS FOR PREPARING ALKYL ESTERS OF (METH)ACRYLIC ACID 未知

    公开(公告)号：CZ273496A3

    公开(公告)日：1998-05-13

    申请号：CZ273496

    申请日：1996-09-18

    Applicant: BASF AG

    Inventor： BAUR KARL GERHARD DR ,  ANNEN ULRICH DR ,  EXNER HERBERT DR ,  FRIED MICHAEL DR ,  RAUH ULRICH

    IPC: C07C67/08 ,  C07C67/327 ,  C07C69/54

    Abstract: A process for the prodn. of (1-4C alkyl) (meth)acrylate esters (AM/AE) from esters of formula (I) and opt. esters of formula (II), in which R = H or Me; R , R = 1-4C alkyl; n = 0 or more. The process comprises reaction in the liq. phase under reduced pressure in presence of acid, with continuous removal of cleavage prods. Also claimed is a process for the prodn. of (AM/AE) by the acid-catalysed esterification of 1-4C alkanols with (meth)acrylic acid, in which by-prods. (I) and (II) are sepd. from the prod. mixt. and subjected to the above cleavage process, and the cleavage prods. are continuously removed and returned to the esterification process.

    3.
    发明专利
    未知

    公开(公告)号：DE4341770A1

    公开(公告)日：1995-06-14

    申请号：DE4341770

    申请日：1993-12-08

    Applicant: BASF AG

    Inventor： STERZEL HANS-JOSEF DR ,  VOGEL HERBERT DR ,  EXNER HERBERT DR ,  KRATZ DETLEF DR ,  BRUDERMUELLER MARTIN DR

    IPC: C07C59/08 ,  C07C67/08 ,  C12P7/56 ,  C12R1/245 ,  C07C69/68 ,  C07D319/10

    Abstract: A process for the preparation of lactic acid esters by fermentation of mixtures containing sugars, conversion of the lactic acid resulting from the fermentation into its salts and subsequent esterification, characterised in that a) alkaline earth metal carbonate or bicarbonate is added to the fermentation broth in order to neutralise at least 50 mol% of the resulting lactic acid, b) the resulting fermentation broth is adjusted to a pH from 7 to 13 by adding NH3 and CO2, and the resulting precipitates are separated off, c) the ammonium lactate solution obtained and purified in this way is esterified with an alcohol

    5.
    发明专利
    未知

    公开(公告)号：DE19536183A1

    公开(公告)日：1997-04-03

    申请号：DE19536183

    申请日：1995-09-28

    Applicant: BASF AG

    Inventor： BAUR KARL GERHARD DR ,  ANNEN ULRICH DR ,  EXNER HERBERT DR ,  FRIED MICHAEL DR ,  RAUCH ULRICH

    IPC: C07C67/08 ,  C07C67/327 ,  C07C69/54 ,  C07C67/48 ,  C07C69/67 ,  C07C67/313

    Abstract: A process for the prodn. of (1-4C alkyl) (meth)acrylate esters (AM/AE) from esters of formula (I) and opt. esters of formula (II), in which R = H or Me; R , R = 1-4C alkyl; n = 0 or more. The process comprises reaction in the liq. phase under reduced pressure in presence of acid, with continuous removal of cleavage prods. Also claimed is a process for the prodn. of (AM/AE) by the acid-catalysed esterification of 1-4C alkanols with (meth)acrylic acid, in which by-prods. (I) and (II) are sepd. from the prod. mixt. and subjected to the above cleavage process, and the cleavage prods. are continuously removed and returned to the esterification process.

    10.
    发明专利
    未知

    公开(公告)号：DE19536178A1

    公开(公告)日：1997-04-03

    申请号：DE19536178

    申请日：1995-09-28

    Applicant: BASF AG

    Inventor： EXNER HERBERT DR ,  BAUR KARL GERHARD DR ,  DOCKNER TONI DR ,  POTTHOFF CHRISTIANE ,  DAMS ALBRECHT DR

    IPC: C07C67/08 ,  C07C67/54 ,  C07C69/54

    Abstract: The continuous prodn. of alkyl(meth)acrylates (I) by the reaction of (meth)acrylic acid (II) and 1-8C monohydric alcohols (III) in homogeneous liq. phase at elevated temp. in the absence of solvent and in presence of an acid esterification catalyst (IV). The process comprises (a) feeding (II), (III) and (IV) continuously into a reaction zone (RZ), (b) removing (I) after a residence time in the form of an azeotrope contg. water or water and (III) in addn. to (I) at the top of a rectifier column (RC) mounted over the RZ, (c) separating the distillate into an organic phase contg. (I) and aq. phase(s) contg. water, (d) recycling part of the organic phase via the top of the column and opt. returning water to the RZ, (e) separating (I) from the rest of the organic phase and removing part of the reaction mixt. continuously from the RZ. The RZ consists of a cascade of at least two reactors in series, and the outflow from one reactor provides the input flow for the next reactor. Also claimed is an appts. for this process.

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