公开(公告)号：DE59503252D1

公开(公告)日：1998-09-24

申请号：DE59503252

申请日：1995-09-30

Applicant: BASF AG

Inventor： DOCKNER TONI DR ,  LERMER HELMUT DR ,  RAUH ULRICH ,  NESTLER GERHARD DR

IPC: B01D11/04 ,  C07B61/00 ,  C07C67/08 ,  C07C67/58 ,  C07C69/54

Abstract: In the prepn. of a mono(meth)acrylate (I) of a 4-6 C alkandiol (II) from an aq. soln. contg. (I) and (II) by solvent extn., the organic solvent used for extn. is selected from esters (III) of 1-4 C alkanecarboxylic acids and 1-5 C alkanols, simple and mixed 4-8 C dialkyl ethers (IV) and mixts. of these. Also claimed is a method of prepn. and sepg. (I).

公开(公告)号：DE19648745A1

公开(公告)日：1998-05-28

申请号：DE19648745

申请日：1996-11-25

Applicant: BASF AG

Inventor： AICHINGER HEINRICH DR ,  FRIED MICHAEL DR ,  NESTLER GERHARD DR ,  DAMS ALBRECHT DR

IPC: C07C67/08 ,  C07C67/58 ,  C07C69/54 ,  C07C67/48 ,  B01J38/48

Abstract: The invention relates to a method for producing (meth)acrylic acid esters by reacting (meth)acrylic acid with C4-C12-alkanols in the presence of sulfuric acid or of a sulfuric acid mono-C4-C12-alkyl ester as a catalyst, wherein the catalyst is regenerated by extraction with water from the reaction mixture and the aqueous catalyst solution is reintroduced into the esterification. The concentration of non-reacted alkanol in the reaction mixture that is to be extracted amounts to a maximum of 5 wt.% in relation to said reaction mixture.

公开(公告)号：ES2112005T3

公开(公告)日：1998-03-16

申请号：ES95115501

申请日：1995-09-30

Applicant: BASF AG

Inventor： DOCKNER TONI DR ,  LERMER HELMUT DR ,  BITTINS KLAUS DR ,  NESTLER GERHARD DR ,  BRAUCH GUNDO DR

IPC: C07B61/00 ,  C07C67/08 ,  C07C67/60 ,  B01J27/02 ,  C07C69/54

Abstract: A process is claimed for the prodn. of 1,4-butanediol mono-(meth)acrylate (I) by esterification of (meth)acrylic acid (MAA) with 1,4-butanediol (BD). In this process the aq. soln. of unreacted BD which is obtd. is worked up by converting the BD into tetrahydrofuran (THF) and sepg. the THF.

公开(公告)号：DK0706991T3

公开(公告)日：1998-03-09

申请号：DK95115501

申请日：1995-09-30

Applicant: BASF AG

Inventor： DOCKNER TONI DR ,  LERMER HELMUT DR ,  NESTLER GERHARD DR ,  BITTINS KLAUS DR ,  BRAUCH GUNDO DR

IPC: B01J27/02 ,  C07B61/00 ,  C07C67/08 ,  C07C67/60 ,  C07C69/54

Abstract: A process is claimed for the prodn. of 1,4-butanediol mono-(meth)acrylate (I) by esterification of (meth)acrylic acid (MAA) with 1,4-butanediol (BD). In this process the aq. soln. of unreacted BD which is obtd. is worked up by converting the BD into tetrahydrofuran (THF) and sepg. the THF.

公开(公告)号：DE19627850A1

公开(公告)日：1998-01-15

申请号：DE19627850

申请日：1996-07-10

Applicant: BASF AG

Inventor： MACHHAMMER OTTO DR ,  NESTLER GERHARD DR

IPC: C07C57/05 ,  C07C51/44 ,  C07C51/48 ,  C07C57/07

Abstract: A method of preparing acrylic acid or methacrylic acid comprises the following steps: (a) preparation of a gaseous reaction mixture which contains acrylic acid or methacrylic acid, essentially having the composition of a reaction mixture of catalytic gas-phase oxidation of C3/C4 alkanes, alkenes, alkanols and/or alkanals and/or precursors thereof to form acrylic acid or methacrylic acid, (b) absorption of the reaction product with a solvent mixture consisting of at least one lactame dissolved in at least one polar organic solvent, and (c) distillation of the reaction product-bearing solvent mixture to obtain a crude acrylic acid or crude methacrylic acid and the solvent mixture.

公开(公告)号：DE19627679A1

公开(公告)日：1998-01-15

申请号：DE19627679

申请日：1996-07-10

Applicant: BASF AG

Inventor： LEHNERT KLAUS ,  NESTLER GERHARD DR ,  ECK BERND ,  MUELLER-ENGEL KLAUS JOACHIM DR

IPC: C07C57/04 ,  C07C51/43 ,  C07C57/07 ,  C07C57/075

Abstract: The invention concerns a process for purifying by crystallization crude acrylic acid containing dibenzo-1,4-thiazine, the diacrylic acid content of the crude acrylic acid being set at a higher value before crystallization.

公开(公告)号：CZ9503021A3

公开(公告)日：1996-06-12

申请号：CZ302195

申请日：1995-11-16

Applicant: BASF AG

Inventor： HERBST HOLGER DR ,  NESTLER GERHARD DR ,  DARLINGZON JERRY ,  MARTAN HANS DR

IPC: C07C57/075 ,  C07C51/44 ,  C07C57/055 ,  C07C57/07

CPC classification number: C07C51/44 ,  Y10S203/22 ,  C07C57/04

公开(公告)号：DE4436245A1

公开(公告)日：1996-04-18

申请号：DE4436245

申请日：1994-10-11

Applicant: BASF AG

Inventor： DOCKNER TONI DR ,  LERMER HELMUT DR ,  RAUH ULRICH ,  NESTLER GERHARD DR

IPC: B01D11/04 ,  C07B61/00 ,  C07C67/08 ,  C07C67/58 ,  C07C69/54 ,  C07C31/20

Abstract: In the prepn. of a mono(meth)acrylate (I) of a 4-6 C alkandiol (II) from an aq. soln. contg. (I) and (II) by solvent extn., the organic solvent used for extn. is selected from esters (III) of 1-4 C alkanecarboxylic acids and 1-5 C alkanols, simple and mixed 4-8 C dialkyl ethers (IV) and mixts. of these. Also claimed is a method of prepn. and sepg. (I).

公开(公告)号：DE4436242A1

公开(公告)日：1996-04-18

申请号：DE4436242

申请日：1994-10-11

Applicant: BASF AG

Inventor： DOCKNER TONI DR ,  LERMER HELMUT DR ,  RAUH ULRICH ,  NESTLER GERHARD DR

IPC: C07C57/07 ,  C07C67/08 ,  C07C67/58 ,  C07C69/54 ,  C07C31/20

Abstract: In the sepn. of a di(meth)acrylate (I) of a 4-6 C alkandiol (II) from a mixt. of (II), the mono(meth) acrylate (III) and (I) by extn. with an organic solvent (IV) in the presence of water, the mixt. contg. (I) is supplied to the middle of an extn. column and water and (V) are passed through the column in countercurrent. Also claimed is the prepn. (III), esp. butan-1,4-diol monoacrylate (IIIA).

公开(公告)号：DE4436241A1

公开(公告)日：1996-04-18

申请号：DE4436241

申请日：1994-10-11

Applicant: BASF AG

Inventor： DOCKNER TONI DR ,  LERMER HELMUT DR ,  BITTINS KLAUS DR ,  NESTLER GERHARD DR ,  BRAUCH GUNDO DR

IPC: B01J27/02 ,  C07B61/00 ,  C07C67/08 ,  C07C67/60 ,  C07C69/54 ,  C07D307/08

Abstract: A process is claimed for the prodn. of 1,4-butanediol mono-(meth)acrylate (I) by esterification of (meth)acrylic acid (MAA) with 1,4-butanediol (BD). In this process the aq. soln. of unreacted BD which is obtd. is worked up by converting the BD into tetrahydrofuran (THF) and sepg. the THF.