公开(公告)号：ES2145372T3

公开(公告)日：2000-07-01

申请号：ES96120076

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

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：ES2145371T3

公开(公告)日：2000-07-01

申请号：ES96120074

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

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：ID23871A

公开(公告)日：2000-05-25

申请号：ID20000704

申请日：1998-10-21

Applicant: BASF AG

Inventor： AICHINGER HEINRICH ,  HERBST HOLGER ,  NESTLER GERHARD ,  SCHRODER JURGEN

IPC: B08B3/08 ,  C07C67/03 ,  C07C67/04 ,  C07C67/08 ,  C07C67/48 ,  C07C69/54 ,  C11D7/06 ,  C11D11/00

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.

公开(公告)号：DE19851983A1

公开(公告)日：2000-05-18

申请号：DE19851983

申请日：1998-11-11

Applicant: BASF AG

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

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

Abstract: A method for continuous production of (meth)acrylic alkyl esters by reacting (meth)acrylic acid with alkanols containing 1-8 C-atoms, whereby raw (meth)acrylic acid containing acetic acid is used as a starting compound and the alkyl acetate that is formed as a by-product is evacuated in an appropriate area.

公开(公告)号：DE59507043D1

公开(公告)日：1999-11-18

申请号：DE59507043

申请日：1995-12-01

Applicant: BASF AG

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

IPC: C07C57/055 ,  C07C51/44 ,  C07C51/46 ,  C07C57/07 ,  C07C57/075 ,  C07C57/04

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：AU1230899A

公开(公告)日：1999-05-10

申请号：AU1230899

申请日：1998-10-21

Applicant: BASF AG

Inventor： AICHINGER HEINRICH ,  HERBST HOLGER ,  NESTLER GERHARD ,  SCHRODER JURGEN

IPC: B08B3/08 ,  C07C67/03 ,  C07C67/04 ,  C07C67/08 ,  C07C67/48 ,  C07C69/54 ,  C11D7/06 ,  C11D11/00

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.

公开(公告)号：BR9703407A

公开(公告)日：1999-01-05

申请号：BR9703407

申请日：1997-05-27

Applicant: BASF AG

Inventor： AICHINGER HEINRICH ,  HERBST HOLGER ,  DAMS ALBRECHT ,  WECK ALEXANDER ,  NESTLER GERHARD ,  IFFLAND GABRIELE ,  EXNER HERBERT

IPC: B01J27/02 ,  B01J31/02 ,  C07B41/12 ,  C07B61/00 ,  C07C67/08 ,  C07C67/54 ,  C07C69/54

公开(公告)号：SG54107A1

公开(公告)日：1998-11-16

申请号：SG1996000294

申请日：1996-01-18

Applicant: BASF AG

Inventor： HERBST HOLGER ,  HAMMON ULRICH ,  GERSTENKORN BERNHARD

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

Abstract: In the sepn. of (meth)acrylic acid (I) from mixts. contg. (I) as main prod. and lower aldehydes as by-prods. by rectification in a column with a distn. zone and a concn. zone, the mixt. is not supplied to the column directly. Instead, it is passed to a heated dwell vessel connected to the concn. zone, in which the mixt. is kept boiling, and the sump liquid from this vessel is fed to the column.

公开(公告)号：AU6207798A

公开(公告)日：1998-08-07

申请号：AU6207798

申请日：1998-01-08

Applicant: BASF AG

Inventor： AICHINGER HEINRICH ,  FRIED 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：MX9706337A

公开(公告)日：1998-07-31

申请号：MX9706337

申请日：1997-08-20

Applicant: BASF AG

Inventor： KOCH ANDREAS ,  AUMULLER ALEXANDER ,  MITULLA KONRAD ,  TREMMEL GREGOR ,  HERBST HOLGER

IPC: C07D211/58 ,  C07B63/04 ,  C07D211/94 ,  C07F9/59 ,  C09K15/22 ,  C09K15/30

Abstract: La presente invencion se refiere a los N-oxidos de 4-acilaminopiperidina la A+B (Ia) en donde A1 es hidrogeno o un radical orgánico y B1 es un radical IIa. (Ver Formula) en donde R1-R4 son cada uno alquilo de C1-C4, y, R1 y R2, por una parte, y R3 y R4, por otra parte, pueden además estar unidos para formar un anillo de 5 a 6 miembros, R5 es H o alquilo de C1-C4 y R6 es H o alquilo de C1-C18 se utilizan para estabilizar materiales orgánicos contra el efecto danino de los radicales libres, particularmente durante la destilacion de monomeros que sufre de polimerizacion por radicales libres, especialmente el estireno.