公开(公告)号：CZ9600160A3

公开(公告)日：1996-08-14

申请号：CZ16096

申请日：1996-01-18

Applicant: BASF AG

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

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

CPC classification number: C07C51/44 ,  C07C57/04

公开(公告)号：DE19501326A1

公开(公告)日：1996-07-25

申请号：DE19501326

申请日：1995-01-18

Applicant: BASF AG

Inventor： HERBST HOLGER DR ,  HAMMON ULRICH DR

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：CZ329195A3

公开(公告)日：1996-07-17

申请号：CZ329195

申请日：1995-12-13

Applicant: BASF AG

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

IPC: C07C57/055 ,  C07C51/44 ,  C07C51/46 ,  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：CH686438A5

公开(公告)日：1996-03-29

申请号：CH110594

申请日：1994-04-12

Applicant: BASF AG

Inventor： HERBST HOLGER DR ,  HICKMANN ECKHARD DR ,  HUEBINGER WOLFGANG DR ,  JAEGER ULRICH DR ,  HARTH KLAUS DR ,  KROPP RUDOLF ,  REICH WOLFGANG DR

IPC: B01J19/02 ,  C07B63/04 ,  C07C51/50 ,  C07C57/07 ,  C07C57/075 ,  C07C67/62 ,  C08F2/38 ,  C08F2/40 ,  C23C14/06 ,  C01B31/00 ,  C23C14/12 ,  C23C14/24

公开(公告)号：DK0713854T3

公开(公告)日：1998-10-19

申请号：DK95117892

申请日：1995-11-14

Applicant: BASF AG

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

IPC: C07C57/075 ,  C07C51/44 ,  C07C57/055 ,  C07C57/07 ,  C07C57/04 ,  C07C51/487 ,  C07C51/50

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.

公开(公告)号：DK0722926T3

公开(公告)日：1998-10-12

申请号：DK96100461

申请日：1996-01-13

Applicant: BASF AG

Inventor： HAMMON ULRICH DR ,  HERBST HOLGER DR

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：DE19604253A1

公开(公告)日：1997-08-07

申请号：DE19604253

申请日：1996-02-06

Applicant: BASF AG

Inventor： SCHMIDT WILLI ,  GEISENDOERFER MATTHIAS DR ,  DOCKNER TONI DR ,  HERBST HOLGER DR ,  NESTLER GERHARD DR ,  WECK ALEXANDER DIPL ING

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

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：DE19536191A1

公开(公告)日：1997-04-03

申请号：DE19536191

申请日：1995-09-28

Applicant: BASF AG

Inventor： AICHINGER HEINRICH DR ,  GEISENDOERFER MATTHIAS DR ,  HERBST HOLGER DR ,  NESTLER GERHARD DR

IPC: C07C27/02 ,  C07C67/08 ,  C07C67/327 ,  C07C67/60 ,  C07C69/54 ,  C07C67/48 ,  C07C69/67 ,  C07C69/708

Abstract: In the esterification of (meth)acrylic acid with an alkanol in the presence of an acid esterification catalyst, in which unreacted starting materials and the (meth)acrylic ester are sepd. by distn., a sump prod. (I) contg. oxy esters (II) is formed. The novelty is that (I) is sepd. and heated at 150-250 degrees C in the presence of acid and at a pressure at which prods. formed by cracking (II) vaporise directly.

公开(公告)号：DE19510184A1

公开(公告)日：1996-09-26

申请号：DE19510184

申请日：1995-03-21

Applicant: BASF AG

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

IPC: C07D211/58 ,  C07B63/04 ,  C07D211/94 ,  C07F9/59 ,  C09K15/22 ,  C09K15/30 ,  C07D221/20 ,  C07D401/06 ,  C07D405/06 ,  C07D409/06 ,  C07C15/46 ,  C07C7/05 ,  C07C7/20

Abstract: The invention concerns 4-acylamino piperidin-N-oxyls of the formula: A B wherein A stands for hydrogen or an organic group and B stands for a group of formula (IIa) in which the substituents have the following meanings: R -R are C1-C4 alkyl (R and R and R and R can be bound to a 5- or 6-member ring); R is H or C1-C4 alkyl; and R is H or C1-C18 alkyl. The compounds in question serve to stabilise organic substances against the harmful effects of radicals, especially in the distillation of radically polymerising monomers such as styrene.

公开(公告)号：CZ9503291A3

公开(公告)日：1996-07-17

申请号：CZ329195

申请日：1995-12-13

Applicant: BASF AG

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

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

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