公开(公告)号：CZ30997A3

公开(公告)日：1997-10-15

申请号：CZ30997

申请日：1997-02-03

Applicant: BASF AG

Inventor： SCHMIDT WILLI ,  MATTHIAS GEISENDORFER DR ,  DOCKNER TONI DR ,  HERBST HOLGER DR ,  NESTLER GERHARD DR

IPC: B01J31/02 ,  C07B61/00 ,  C07C67/08 ,  C07C67/54 ,  C07C69/54

Abstract: In the continuous production of alkyl (meth)acrylates (AA) by reacting (meth)acrylic acid with 1-8 carbon (C) monohydric alkanols in homogeneous liquid phase, free from solvent, at elevated temperature and in the presence of an acid esterification catalyst; (a) (meth)acrylic acid, alkanol and catalyst are fed to a reaction zone; (b) during a residence time, the water formed is separated in a rectification unit (RU) III above the reaction zone; (c) the aqueous distillate is separated into an organic phase containing the alkanol and an aqueous phase; (d) the organic phase is recycled to RU III; and (e) the reaction mixture is discharged from the reaction zone and passed to another RU, where AA is separated by distillation. The novel features are that: (i) the molar ratio of (meth)acrylic acid and alkanol is 1:(0.75-2); (ii) the aqueous phase from RU III is partly recycled to RU III; (iii) the reaction mixture is passed to RU I, in which it is separated into a product (II) containing the catalyst and a product (I) containing AA, residual alkanol and residual (meth)acrylic acid; and (iv) (I) is passed to RU II, in which AA is separated from residual alkanol and residual (meth)acrylic acid and the alkanol and acid are recycled to the reaction zone. Preferably the alkanol is 2-ethylhexanol. The catalyst is para-toluenesulphonic acid (p-TSA) and/or other organic sulphonic acids, e.g. methane-, benzene- or dodecylbenzene-sulphonic acid, and/or sulphuric acid (H2SO4). The catalyst concentration in the reaction mixture is 0.1-10, especially 0.1-6 wt.% p-TSA in the reaction zone and 2.5-50 wt.% p-TSA in the sump or an equimolar amount of organic sulphonic acid and/or H2SO4. The reaction zone consists of a cascade of NOTLESS 2, especially 2-4 consecutive sections, especially reactors with circulating vapourisers. All rectification units are rectification columns.

公开(公告)号：DE19501325A1

公开(公告)日：1996-07-25

申请号：DE19501325

申请日：1995-01-18

Applicant: BASF AG

Inventor： HERBST HOLGER DR ,  NESTLER GERHARD DR ,  HAMMON ULRICH DR

IPC: C07C57/04 ,  C07C51/44 ,  C07C57/05 ,  C07C57/07

Abstract: In the sepn. of (meth)acrylic acid (I) from mixts. by rectification, in which (I) is discharged from the column at a point higher than the inlet for the mixt., the refluxing liq. is removed in at least one position of the column, the oligomerised and/or polymerised (I) is sepd. and the liq. is recycled to the column.

公开(公告)号：CZ9402476A3

公开(公告)日：1995-07-12

申请号：CZ247694

申请日：1994-10-07

Applicant: BASF AG

Inventor： DOCKNER TONI DR ,  NESTLER GERHARD DR ,  HERBST HOLGER DR ,  LERMER HELMUT DR ,  MARTAN HANS DR ,  VOGEL HERBERT DR ,  EXNER HERBERT DR

IPC: C07C57/04 ,  C07C51/487 ,  C07C57/055 ,  C07C57/07 ,  C07C57/075 ,  C07C51/42

CPC classification number: C07C51/487 ,  Y10S203/22 ,  C07C57/04

公开(公告)号：CZ247694A3

公开(公告)日：1995-07-12

申请号：CZ247694

申请日：1994-10-07

Applicant: BASF AG

Inventor： DOCKNER TONI DR ,  NESTLER GERHARD DR ,  HERBST HOLGER DR ,  LERMER HELMUT DR ,  MARTAN HANS DR ,  VOGEL HERBERT DR ,  EXNER HERBERT DR

IPC: C07C57/04 ,  C07C51/487 ,  C07C57/055 ,  C07C57/07 ,  C07C57/075 ,  C07C51/42

Abstract: A process for the purification of crude (meth)acrylic acid in which the crude (meth)acrylic acid is worked up by distillation after addition of a primary amine compound and of an organic sulphonic acid.