公开(公告)号：DE59606209D1

公开(公告)日：2001-01-18

申请号：DE59606209

申请日：1996-09-26

Applicant: BASF AG

Inventor： EXNER DR ,  BAUR DR ,  DOCKNER DR ,  POTTHOFF CHRISTIANE ,  DAMS 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.

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.

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.

公开(公告)号：MX9604237A

公开(公告)日：1997-03-29

申请号：MX9604237

申请日：1996-09-23

Applicant: BASF AG

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

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

Abstract: Un proceso y un aparato para la preparacion continua de ésteres de alquilo de ácido (met)acrílico mediante la reaccion de ácido (met)acrílico y alcanoles monohídrico de 1 a 8 átomos de carbono en la fase libre de solvente líquida homogénea, a temperaturas elevadas y en presencia de un catalizador ácido de esterificacion, mediante la alimentacion del ácido (met)acrílico, el alcanol y el catalizador ácido en forma continua a una zona de reaccion, la zona de reaccion consiste en una cascada de cuando menos dos regiones de reaccion conectadas en serie, y la corriente de descarga de una region de reaccion forma una corriente de alimentacion de una region de reaccion que se encuentra corriente abajo. La cascada puede tener de dos a cuatro regiones de reaccion espacialmente separadas entre ellas.

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.