公开(公告)号：DE19746689A1

公开(公告)日：1999-04-29

申请号：DE19746689

申请日：1997-10-22

Applicant: BASF AG

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

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

Abstract: Recovery of (meth)acrylic acid from a mixture containing a higher boiling solvent involves distillation in a column with an inlet for the mixture between the evaporator and distillation and enhancer parts and a side discharge for (meth)acrylic acid. A polymerization inhibitor is introduced into the column near the top and, in a larger amount, near the side discharge.

公开(公告)号：DE59600719D1

公开(公告)日：1998-12-03

申请号：DE59600719

申请日：1996-01-04

Applicant: BASF AG

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

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

Abstract: In the sepn. of (meth)acrylic acid (I) from mixts. by rectification, in which (I) is discharged from the column at a point higher than the inlet for the mixt., the refluxing liq. is removed in at least one position of the column, the oligomerised and/or polymerised (I) is sepd. and the liq. is recycled to the column.

公开(公告)号：DE19648743A1

公开(公告)日：1998-05-28

申请号：DE19648743

申请日：1996-11-25

Applicant: BASF AG

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

IPC: C07C67/08 ,  C07C67/54 ,  C07C67/60 ,  C07C69/54 ,  B01J38/48 ,  C07C67/48

Abstract: The invention relates to a method for producing (meth)acrylic acid esters by making (meth)acrylic acid react with C4-C6 alkanols in the presence of a strong inorganic acid or of C4-C6 monoalkyl ester of a polyvalent strong acid as catalyzer. Said method is characterized in that the non-reacted alkanol is removed through distillation from the reaction mixture obtained and subsequently the catalyzer is eliminated from the mixture obtained.

公开(公告)号：ID18425A

公开(公告)日：1998-04-09

申请号：ID972394

申请日：1997-07-10

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：CZ270196A3

公开(公告)日：1997-06-11

申请号：CZ270196

申请日：1996-09-16

Applicant: BASF AG

Inventor： AICHINGER HEINRICH DR ,  GEISENDORFER MATHIAS DR ,  HERBST HOLGER DR ,  NESTLER GERHARD DR

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

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：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：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：DE4217383A1

公开(公告)日：1993-12-02

申请号：DE4217383

申请日：1992-05-26

Applicant: BASF AG

Inventor： HENN ROLF DR ,  BESECKE SIEGMUND DR ,  DECKERS ANDREAS DR ,  GUENTHERBERG NORBERT DR ,  BRUDERMUELLER MARTIN DR ,  NESTLER GERHARD DR

IPC: C08J9/12 ,  C08F2/18 ,  C08F2/44 ,  C08F257/02 ,  C08J9/16 ,  C08L25/00 ,  C08L33/00 ,  C08L33/24 ,  C08F212/08 ,  C08L25/08 ,  C08J9/20 ,  C08J9/08 ,  C08J9/14

Abstract: Expandable styrene polymers containing a) 0 to 90 % wt. of a styrene polymer different from b) or a styrene copolymer with at least 50 % wt. monopolymerised styrene, b) 10 to 100 % wt. of a styrene/methacrylamide copolymer consisting to the extent of 0.5 to 50 % wt. of at least one monopolymerised N-substituted methacrylamide of general formula (I) in which R and R are the same or different and are hydrogen, C1 to C15 alkyl, C6 to C16 cycloalkyl or C6 to C20 aryl, and in the case of constitutents R and R with at least 2 carbon atoms, at least 2 carbon atoms may be cross-linked via hetero atoms, and c) 1 to 15 % wt., related to the sum of a) and b), or an aliphatic C3 to C9 hydrocarbon and/or carbon dioxide as the foaming agent.

公开(公告)号：DE58904789D1

公开(公告)日：1993-07-29

申请号：DE58904789

申请日：1989-10-21

Applicant: BASF AG

Inventor： REHMER GERD DR ,  BOETTCHER ANDREAS DR ,  PFOEHLER PETER DR ,  AYDIN ORAL DR ,  NESTLER GERHARD DR

IPC: C08J5/18 ,  C08F220/18 ,  C08L23/00 ,  C08L33/04 ,  C08L33/06 ,  C09J133/06

Abstract: Compositions which can be crosslinked under an atmospheric oxygen atmosphere by means of ultraviolet irradiation and are based on (meth)acrylate copolymers having a K value of from 10 to 100, obtained by free-radical polymerisation in solid phase or solution of a) 5 to 97.4% by weight of i-amyl acrylate and/or i-amyl methacrylate and b) 0 to 89.9% by weight of (meth)acrylates whose hompolymers have a glass transition temperature of below -30 DEG C, c) 2.5 to 30% by weight of alpha , beta -monoolefinically unsaturated compounds whose homopolymers have a glass transition temperature of above - 30 DEG C, d) 0 to 10% by weight of monoolefinically unsaturated acids and/or anhydrides thereof, e) 0 to 20% by weight of further olefinically unsaturated monomers containing at least one of the following functional groups: hydroxyl, amide, epoxide, ether, ester, urethane, urea, primary, secondary or tertiary amine and ether, and f) 0.1 to 5% by weight of a copolymerisable benzophenone or acetophenone derivative, the sum of the percentages by weight x = a + b + c + d + f in each case being 100.

公开(公告)号：DE3265263D1

公开(公告)日：1985-09-12

申请号：DE3265263

申请日：1982-10-20

Applicant: BASF AG

Inventor： MERGER FRANZ DR ,  NESTLER GERHARD DR ,  PLATZ ROLF DR ,  TOWAE FRIEDRICH DR ,  HELLBACH HANS

IPC: C07C263/04 ,  C07C265/04 ,  C07C118/00

Abstract: Organic isocyanates, preferably alkyl, mono-, di- and/or polyisocyanates or aryl-mono-, di- and/or polyisocyanates, are prepared by thermally cleaving the corresponding urethanes at temperatures of 175 DEG C. to 600 DEG C. in the presence of carbon, preferably in an agitated carbon bed or in a fluidized bed containing carbon.