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51.
公开(公告)号:MY119647A
公开(公告)日:2005-06-30
申请号:MYPI9803589
申请日:1998-08-06
Applicant: BASF AG
Inventor: NESTLER GERHARD , AICHINGER HEINRICH , HERBST HOLGER
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.
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公开(公告)号:DE59909692D1
公开(公告)日:2004-07-15
申请号:DE59909692
申请日:1999-03-04
Applicant: BASF AG
Inventor: HAMMON ULRICH , HERBST HOLGER , NESTLER GERHARD
IPC: C07C51/44 , C07C51/50 , C07C57/04 , C07C57/055 , C07C57/07 , C07C57/075
Abstract: In a process for rectificative isolation of (meth)acrylic acid from a mixture containing, as main components, (meth)acrylic acid and an organic liquid having a higher boiling point than (meth)acrylic acid, the rectification is carried out with the addition of a surfactant.
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公开(公告)号:MX217992B
公开(公告)日:2003-12-08
申请号:MXPA00002230
申请日:2000-03-03
Applicant: BASF AG
Inventor: AICHINGER HEINRICH , HERBST HOLGER , NESTLER GERHARD , SCHROEDER JUERGEN
Abstract: Plant parts which are used for the production or processing of (meth)acrylic esters are cleaned by(a) emptying the plant parts,(b) flushing the plant parts with aqueous 5 to 50% strength by weight alkali metal hydroxide solution,(c) removing the alkali metal hydroxide solution from the plant parts,(d) if required, washing the plant parts with water and(e) if required, drying the plant parts.
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公开(公告)号:DE59704499D1
公开(公告)日:2001-10-11
申请号:DE59704499
申请日:1997-02-04
Applicant: BASF AG
Inventor: DAMS ALBRECHT , HERBST HOLGER , AICHINGER HEINRICH , NESTLER GERHARD , EXNER HERBERT
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公开(公告)号:SG79930A1
公开(公告)日:2001-04-17
申请号:SG1996011800
申请日:1996-12-18
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).
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公开(公告)号:DE19922722A1
公开(公告)日:2000-11-23
申请号:DE19922722
申请日:1999-05-18
Applicant: BASF AG
Inventor: DAMS ALBRECHT , AICHINGER HEINRICH , HERBST HOLGER , NESTLER GERHARD , SCHROEDER JUERGEN
IPC: C07C67/08 , C07C67/327 , C07C69/54 , C07C67/48
Abstract: The cracking residues of the oxyester-containing sump product which has been obtained after distilling off unreacted materia and the ester in the catalysed esterification of (meth)acrylic acid with an alcohol are combined with the distillation residue a then hydrolysed in the presence of water and acids or bases. Catalysed esterification of (meth)acrylic acid with an alcohol involves distilling off the unreacted materials and the este leave an oxyester-containing sump product which is either: (a) optionally treated with (meth)acrylic acid or oligomeric acid and then cracked using an acid catalyst other than a (meth)acrylic acid or oligomer, with the cracked product removed to leave a cracking residue; or (b) distilled to remove the oxyester and leave a distillation residue, with the oxyester then being optionally treated and cracked as per (a) above. The novel feature is that the cracking residue from (a) or (b) is hydrolysed together with the distillation residue in the presence of water and acids or bases.
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公开(公告)号:DE19935453A1
公开(公告)日:2000-10-19
申请号:DE19935453
申请日:1999-07-28
Applicant: BASF AG
Inventor: DECKERT PETRA , HERBST HOLGER
Abstract: Alkyl (meth)acrylates (I) is produced by reacting (meth)acrylic acid, 4-8 carbon alkanol and a strongly acid esterification catalyst (IV) in a solvent-free phase in a rectification unit; and pre-purification of the mixture containing (I) by extracting most of (IV) with water and reactive extraction with aqueous alkali solution and then with water to remove residual salts and aqueous impurities. Continuous production of alkyl (meth)acrylates (I) by elevated temperature reaction in a solvent-free phase involves: (a) feeding (meth)acrylic acid (II), 4-8 carbon (C) alkanol (III) and a strongly acid esterification catalyst (IV) to a reaction zone, (b) separating the water formed during a residence time in a first rectification unit acting as reaction zone; (c) separating the resultant distillate into an organic phase containing (III) and an aqueous phase, (d) recycling the organic phase to the rectification unit, and (e) discharging the reaction mixture containing (I) from the reaction zone and passing it to pre-purification. Pre-purification involves: (i) separating most of (IV) by extraction with water; and (ii) reactive extraction with aqueous alkali solution to neutralize and extract the strongly acid components. The remaining organic reaction mixture is then passed to a separation zone comprising other rectification units, in which (I) is separated. The novelty is that the organic reaction mixture leaving the second pre-purification stage is extracted with water to remove residual salts and aqueous impurity fractions before it is passed to the separation zone. An Independent claim is also included for the equipment used for pre-purification.
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公开(公告)号:BR9706837A
公开(公告)日:2000-09-26
申请号:BR9706837
申请日:1997-05-27
Applicant: BASF AG
Inventor: GEISENDOERFER MATTHIAS , HERBST HOLGER , WECK ALEXANDER , NESTLER GERHARD , DOCKNER TONI , SCHMIDT WILLI
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公开(公告)号:DK0780359T3
公开(公告)日:2000-08-07
申请号:DK96120074
申请日:1996-12-13
Applicant: BASF AG
Inventor: AICHINGER HEINRICH , NESTLER GERHARD , HERBST HOLGER , MCGLONE NICOLE E , DARLINGTON JERRY W , DONATH CALVIN F , HEIMANN JOHN C
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.
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公开(公告)号:AU1651200A
公开(公告)日:2000-05-29
申请号:AU1651200
申请日:1999-11-05
Applicant: BASF AG
Inventor: AICHINGER HEINRICH , HERBST HOLGER , NESTLER GERHARD , SCHRODER JURGEN , BECKMANN STEFAN
IPC: C07C67/08 , C07C67/327 , C07C67/60 , C07C69/54
Abstract: In a process for esterifying (meth)acrylic acid with an alkanol in the presence of an esterification catalyst, in which unconverted starting compounds and (meth)acrylic ester to be formed are separated off by distillation and an oxyester-containing bottom product is formed, the bottom product is first separated off and then the oxyesters contained in it are cleaved in the presence of a relatively long-chain alkylbenzenesulfonic acid at elevated temperatures.
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