公开(公告)号：BR9813090A

公开(公告)日：2000-08-22

申请号：BR9813090

申请日：1998-10-21

Applicant: BASF AG

Inventor： HERBST HOLGER ,  NESTLER GERHARD ,  HAMMON ULRICH

IPC: C07C51/25 ,  C07C51/44 ,  C07C51/48 ,  C07C51/50 ,  C07C57/04 ,  C07C57/055 ,  C07C57/07 ,  C07C57/075

公开(公告)号：DK0780360T3

公开(公告)日：2000-08-07

申请号：DK96120076

申请日：1996-12-13

Applicant: BASF AG

Inventor： NESTLER GERHARD ,  AICHINGER HEINRICH ,  HERBST HOLGER ,  MCGLONE NICOLE E ,  DARLINGTON JERRY W ,  DONATH CALVIN F ,  HEIMANN JOHN C

IPC: B01J27/04 ,  B01J27/16 ,  C07B61/00 ,  C07C27/02 ,  C07C57/04 ,  C07C67/03 ,  C07C67/08 ,  C07C67/54 ,  C07C67/60 ,  C07C69/54

Abstract: Esterifying (meth)acrylic acid with an alkanol in the presence of an esterification catalyst is claimed, in which unreacted starting materials and the (meth)acrylic acid ester are sepd. by distillation to leave behind an oxyester sump prod. Either (a) (meth)acrylic acid is added directly to the sump prod. and then the oxyester sump is cleaved at high temp. by an acid catalyst other than (meth)acrylic acid, or (b) the oxyester is sepd. from the sump prod. by distillation and then cleaved in the same way as in step (a).

公开(公告)号：BR9811126A

公开(公告)日：2000-07-18

申请号：BR9811126

申请日：1998-07-23

Applicant: BASF AG

Inventor： AICHINGER HEINRICH ,  HERBST HOLGER ,  NESTLER GERHARD

IPC: C07C67/62 ,  C07C69/54 ,  C09K15/18 ,  C09K15/30

Abstract: A method is described of stabilizing (meth)acrylic esters against unwanted free-radical polymerization, in which the mixture to be stabilized has added to it a polymerization inhibitor mixture comprising at least one nitroxyl radical and/or at least one organic compound having at least one nitroso group, and at least one p-phenylenediamine.

公开(公告)号：DE59605039D1

公开(公告)日：2000-05-31

申请号：DE59605039

申请日：1996-12-13

Applicant: BASF AG

Inventor： NESTLER GERHARD ,  AICHINGER HEINRICH ,  HERBST HOLGER ,  MCGLONE NICOLE E ,  DARLINGTON JERRY W ,  DONATH CALVIN F ,  HEIMANN JOHN C

IPC: B01J27/04 ,  B01J27/16 ,  C07B61/00 ,  C07C27/02 ,  C07C57/04 ,  C07C67/03 ,  C07C67/08 ,  C07C67/54 ,  C07C67/60 ,  C07C69/54

Abstract: Esterifying (meth)acrylic acid with an alkanol in the presence of an esterification catalyst is claimed, in which unreacted starting materials and the (meth)acrylic acid ester are sepd. by distillation to leave behind an oxyester sump prod. Either (a) (meth)acrylic acid is added directly to the sump prod. and then the oxyester sump is cleaved at high temp. by an acid catalyst other than (meth)acrylic acid, or (b) the oxyester is sepd. from the sump prod. by distillation and then cleaved in the same way as in step (a).

公开(公告)号：DE19851984A1

公开(公告)日：2000-05-18

申请号：DE19851984

申请日：1998-11-11

Applicant: BASF AG

Inventor： AICHINGER HEINRICH ,  HERBST HOLGER ,  NESTLER GERHARD ,  SCHROEDER JUERGEN ,  BECKMANN STEFAN

IPC: C07C67/08 ,  C07C67/327 ,  C07C67/60 ,  C07C69/54

Abstract: A method for esterifying (meth)acrylic acid with an alkanol in the presence of an esterification catalyst, whereby non-reacted starting compounds and the (meth)acrylic acid ester that is to be formed are separated by means of distillation and a bottom product containing an oxyester is created. The bottom product is separated and then the oxyesters contained therein are re-separated in the presence of a longer chained alkylbenzene sulfonic acid at a high temperature.

公开(公告)号：BR9806781A

公开(公告)日：2000-05-16

申请号：BR9806781

申请日：1998-01-08

Applicant: BASF AG

Inventor： AICHINGER HEINRICH ,  FRIEDMAN MICHAEL ,  NESTLER GERHARD ,  HERBST HOLGER

IPC: C07C67/08 ,  C07C67/327 ,  C07C67/54 ,  C07C67/60 ,  C07C69/54

Abstract: In a process for esterifying (meth)acrylic acid with an alkanol, oxy ester formed as a byproduct of the esterification is recleaved under acid catalysis with addition of monomeric and/or oligomeric (meth)acrylic acid and water.

公开(公告)号：BR9703408A

公开(公告)日：1999-01-05

申请号：BR9703408

申请日：1997-05-27

Applicant: BASF AG

Inventor： MCGLONE NICOLE E ,  DARLINGTON JERRY W ,  DONATH CALVIN F ,  HEIMANN JOHN C ,  NESTLER GERHARD ,  AICHINGER HEINRICH ,  HERBST HOLGER

IPC: B01J27/16 ,  B01J31/02 ,  C07B61/00 ,  C07C27/02 ,  C07C57/04 ,  C07C67/03 ,  C07C67/08 ,  C07C67/54 ,  C07C67/60 ,  C07C69/54

Abstract: A process for esterifying (meth)acrylic acid with an alkanol in the presence of esterification catalyst comprises: (i) sepg. unreacted starting materials and the ester obtd. by distn., and (ii) producing a bottom prod. contg. an oxy-ester. The bottom prod. is isolated and processed by: (a) direct treatment with oligomeric (meth)acrylic acid (I) followed by heating in the presence of acid catalysts other than (I) to effect cleavage of the oxy-ester, or (b) sepn. of the oxy-ester by distn., followed by treatment of the distillate with (I) and thermal cleavage as above.

公开(公告)号：BR9703406A

公开(公告)日：1999-01-05

申请号：BR9703406

申请日：1997-05-27

Applicant: BASF AG

Inventor： AICHINGER HEINRICH ,  NESTLER GERHARD ,  HERBST HOLGER ,  HEIMANN JOHN C ,  MCGLONE NICOLE E ,  DARLINGTON JERRY W ,  DONATH CALVIN F

IPC: B01J27/04 ,  B01J27/16 ,  C07B61/00 ,  C07C27/02 ,  C07C57/04 ,  C07C67/03 ,  C07C67/08 ,  C07C67/54 ,  C07C67/60 ,  C07C69/54

Abstract: Esterifying (meth)acrylic acid with an alkanol in the presence of an esterification catalyst is claimed, in which unreacted starting materials and the (meth)acrylic acid ester are sepd. by distillation to leave behind an oxyester sump prod. Either (a) (meth)acrylic acid is added directly to the sump prod. and then the oxyester sump is cleaved at high temp. by an acid catalyst other than (meth)acrylic acid, or (b) the oxyester is sepd. from the sump prod. by distillation and then cleaved in the same way as in step (a).

公开(公告)号：SG52746A1

公开(公告)日：1998-09-28

申请号：SG1996008741

申请日：1995-12-01

Applicant: BASF AG

Inventor： NESTLER GERHARD ,  HERBST HOLGER ,  HAMMON ULRICH ,  DARLINGTON JERRY

IPC: C07C51/44 ,  C07C51/46 ,  C07C57/055 ,  C07C57/07 ,  C07C57/075

Abstract: A process for the sepn. of (meth)acrylic acid (I) from a mixt. contg. (a) (I), (b) inert, hydrophobic organic liq. with a higher b.pt. than (I) as main component and (c) lower aldehydes as minor components, comprises rectification with the addn. of a prim. amine and/or salts thereof (II). Also claimed are processes for the prodn. of (I) by gas-phase oxidn. of a 3C/4C starting material (III). Pref. liq. (b) contains diphenyl ether (DPE), and pref. comprises a mixt. of 70-75 wt.% DPE and 25-30 wt.% biphenyl contg. 0.1-25 wt.% (w.r.t. the mixt.) of dimethyl o-phthalate. Amine (II) is a hydrazine deriv., pref. the hydrazide of a carboxylic acid, esp. pref. adipic acid dihydrazide.

公开(公告)号：SG50646A1

公开(公告)日：1998-07-20

申请号：SG1996007648

申请日：1995-11-14

Applicant: BASF AG

Inventor： NESTLER GERHARD ,  MARTAN HANS ,  HERBST HOLGER ,  DARLINGTON JERRY

IPC: C07C57/075 ,  C07C51/44 ,  C07C57/055 ,  C07C57/07 ,  C07C51/50 ,  C07C51/487

Abstract: In a process for purifying crude (meth)acrylic acid, the crude (meth)acrylic acid is worked up by distillation after addition of an organic carboxylic acid hydrazide and, if desired, an organic sulfonic acid.