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    11.
    发明专利
    未知

    公开(公告)号：DE19510891A1

    公开(公告)日：1996-09-26

    申请号：DE19510891

    申请日：1995-03-24

    Applicant: BASF AG

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

    IPC: C07C67/08 ,  C07C69/54 ,  C07C67/54 ,  C07C67/62

    Abstract: A continuous prepn. process for (meth)acrylic acid alkyl esters in a homogeneous, liq., organic solvent-free phase, comprises the following steps : (1) a 1-8C monovalent alcohol and (meth)acrylic acid are reacted in a mol. ratio of 1-2:1 at high temp. in the presence of sulphuric acid or an organic sulphonic acid catalyst, with the acid, alkanol and catalyst all being continuously supplied to a reactor ; (2) following several hours reaction time the azeotrope consisting of a (meth)acrylic acid alkyl ester and water or water / alkanol starting material is passed out of the top of the reactor where the pressure is 0.1-1 atmos. and sepd. in a rectification zone ; (3) the distillate is sepd. into at least one organic phase contg. the ester and at least one aq. phase ; (4) some of the organic phase is returned to the rectification zone and opt. water is returned to the reactor ; (5) the excess alkyl ester is sepd. from the organic phase by known methods ; and (6) some of the reaction mixt. is continuously removed from the reactor. The reaction temp. is 100-150 degrees C, the dwell time is 1-6 h and the reaction mixt. contains 5-20 wt.% acid catalyst.

    PROCESS OF CONTINUOUS PREPARATION OF ALKYL ESTERS OF (METH)ACRYLIC ACID AND APPARATUS FOR MAKING THE SAME
    13.
    发明专利
    PROCESS OF CONTINUOUS PREPARATION OF ALKYL ESTERS OF (METH)ACRYLIC ACID AND APPARATUS FOR MAKING THE SAME 未知

    公开(公告)号：CZ273696A3

    公开(公告)日：1998-05-13

    申请号：CZ273696

    申请日：1996-09-18

    Applicant: BASF AG

    Inventor： EXNER HERBERT DR ,  BAUR KARL DR ,  DOCKNER TONI DR ,  POTTHOFF CHRISTINE ,  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.

    15.
    发明专利
    未知

    公开(公告)号：ES2137607T3

    公开(公告)日：1999-12-16

    申请号：ES96115456

    申请日：1996-09-26

    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.

    16.
    发明专利
    未知

    公开(公告)号：DE59602043D1

    公开(公告)日：1999-07-08

    申请号：DE59602043

    申请日：1996-03-16

    Applicant: BASF AG

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

    IPC: C07C67/08 ,  C07C69/54

    Abstract: A continuous prepn. process for (meth)acrylic acid alkyl esters in a homogeneous, liq., organic solvent-free phase, comprises the following steps : (1) a 1-8C monovalent alcohol and (meth)acrylic acid are reacted in a mol. ratio of 1-2:1 at high temp. in the presence of sulphuric acid or an organic sulphonic acid catalyst, with the acid, alkanol and catalyst all being continuously supplied to a reactor ; (2) following several hours reaction time the azeotrope consisting of a (meth)acrylic acid alkyl ester and water or water / alkanol starting material is passed out of the top of the reactor where the pressure is 0.1-1 atmos. and sepd. in a rectification zone ; (3) the distillate is sepd. into at least one organic phase contg. the ester and at least one aq. phase ; (4) some of the organic phase is returned to the rectification zone and opt. water is returned to the reactor ; (5) the excess alkyl ester is sepd. from the organic phase by known methods ; and (6) some of the reaction mixt. is continuously removed from the reactor. The reaction temp. is 100-150 degrees C, the dwell time is 1-6 h and the reaction mixt. contains 5-20 wt.% acid catalyst.

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