公开(公告)号：DE10138630A1

公开(公告)日：2003-02-27

申请号：DE10138630

申请日：2001-08-13

Applicant: BASF AG

Inventor： NESTLER GERHARD ,  SCHROEDER JUERGEN

IPC: C07C51/43 ,  C08F220/12 ,  C07C57/07 ,  C07C67/08 ,  C07C67/48 ,  C07C69/54 ,  C08G63/21 ,  C09D5/02

Abstract: Pure (meth)acrylic acid and lower (meth)acrylates are prepared from crude (meth)acrylic acid by a process in which I) crude (meth)acrylic acid is separated by crystallization in at least one crystal batch A and at least one mother liquor B and II) at least a part of the crystal batch A is removed as pure (meth)acrylic acid and at least a part of the mother liquor B is used for the preparation of lower (meth)acrylates by esterifying (meth)acrylic acid with the corresponding alcohols in the presence of an acidic catalyst.

公开(公告)号：DE10064641A1

公开(公告)日：2002-06-27

申请号：DE10064641

申请日：2000-12-22

Applicant: BASF AG

Inventor： HAMMON ULRICH ,  NESTLER GERHARD ,  SCHROEDER JUERGEN

IPC: C07C51/25 ,  C07C51/43 ,  C07C51/44 ,  C07C51/50 ,  C07C57/07 ,  C07C57/075 ,  C07C43/23 ,  C07C51/21 ,  C07C57/04 ,  C07D279/16 ,  C09K15/06

Abstract: Production of acrylic acid by heterogeneous catalytic, gas-phase partial oxidation of 3C precursor(s) with molecular oxygen followed by cooling and fractional condensation or rectification, in which phenothiazine and phenolic compound(s) are introduced at or near the head of the rectification or condensation column.

公开(公告)号：DE10063176A1

公开(公告)日：2002-06-20

申请号：DE10063176

申请日：2000-12-18

Applicant: BASF AG

Inventor： MARTIN FRIEDRICH-GEORG ,  NESTLER GERHARD ,  SCHROEDER JUERGEN

IPC: C07C67/08 ,  C07C67/62 ,  C07C69/54 ,  C07C67/54

Abstract: The invention relates to a method for producing (meth)acrylic acid esters by transesterification of the (meth)acrylic acid with an alkanol in the presence of an acid catalyst, a polymerization inhibitor and an organic solvent that forms an azeotropic mixture with water. The reaction mixture is heated to the boiling point of the mixture in a reactor that comprises a distillation unit with a column and a condenser. The azeotropic mixture is distilled off, the organic solvent is returned to the column as reflux and at least a part of the column reflux is contacted with copper or a copper-containing material. The inventive method is advantageous in that substantially no polymerizate is produced in the distillation column.

公开(公告)号：DE10115277A1

公开(公告)日：2002-06-13

申请号：DE10115277

申请日：2001-03-28

Applicant: BASF AG

Inventor： MACHHAMMER OTTO ,  ADAMI CHRISTOPH ,  HECHLER CLAUS ,  SCHROEDER JUERGEN ,  SCHLIEPHAKE VOLKER ,  THIEL JOACHIM ,  DIEHL VOLKER

IPC: C07C51/44 ,  C07C51/48 ,  C07C57/05 ,  C07C57/07

Abstract: The continuous recovery of (meth)acrylic acid (I) from a reaction gas (II), obtained by catalytic gas phase oxidation, includes quenching (II) by vapor cooling with a high-boiling solvent (III), separating (I) by absorption in (III), and separating the (I)-containing (III) by rectification into a first partial stream (PS1) containing mainly (I) and a second partial stream (PS2) containing mainly (III). The continuous recovery of (meth)acrylic acid (I) from a reaction gas (II), obtained by catalytic gas phase oxidation, comprises: (i) quenching (II) by vapor cooling with a high-boiling solvent (III), (ii) separating (I) by absorption in (III), (iii) separating the (I)-containing (III) into a first partial stream (PS1) containing mainly (I) and a second partial stream (PS2) containing mainly (III), (iv) recycling PS2 to step (ii) and (v) recovering (I) from PS1 by distillation and recycling liquid residual streams to step (i), Step (iii) is carried out by rectification.

公开(公告)号：DE10055645A1

公开(公告)日：2001-12-20

申请号：DE10055645

申请日：2000-11-10

Applicant: BASF AG

Inventor： JAWOREK THOMAS ,  KELLER HARALD ,  SCHLIEPHAKE VOLKER ,  SCHROEDER JUERGEN ,  SUTORIS HEINZ FRIEDRICH ,  WAGENBLAST GERHARD

IPC: C08F2/00 ,  C09D4/02 ,  C09D183/12 ,  B05D7/16

Abstract: Use of a liquid composition (A), based on organosilanols (I), for inhibiting polymerization reactions of ethylenically unsaturated monomers (II) on surfaces with which (II) come into contact during processing.

公开(公告)号：DE10036879A1

公开(公告)日：2001-09-20

申请号：DE10036879

申请日：2000-07-28

Applicant: BASF AG

Inventor： NESTLER GERHARD ,  SCHROEDER JUERGEN

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

Abstract: A process for the production of esters of (meth)acrylic acid comprises reaction of (meth)acrylic acid and 6-10C alkanols in a reaction zone, distillation of the mixture in a column and separation of the organic phase, which is at least partially recycled to the reaction zone. A process for the production of esters of (meth)acrylic acid comprises reaction of (meth)acrylic acid and 6-10C alkanols in a reaction zone comprising at least one reaction region in the presence of an acid esterification catalyst whereby the resulting byproduct water containing mixture is distilled over a column and the distillate is separated into an aqueous and organic phase and the organic phase is at least partially recycled to the reaction zone. The aqueous phase is essentially fully discharged and the organic phase is recycled in the reaction zone by the separating region of the column.

公开(公告)号：BR9915230A

公开(公告)日：2001-07-31

申请号：BR9915230

申请日：1999-11-05

Applicant: BASF AG

Inventor： AICHINGER HEINRICH ,  HERBST HOLGER ,  NESTLER GERHAR ,  SCHROEDER JUERGEN ,  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.

公开(公告)号：DE19956509A1

公开(公告)日：2001-01-18

申请号：DE19956509

申请日：1999-11-24

Applicant: BASF AG

Inventor： SUTORIS HEINZ FRIEDRICH ,  WAGENBLAST GERHARD ,  SCHLIEPHAKE VOLKER ,  SCHROEDER JUERGEN ,  KELLER HARALD

IPC: C07B63/04 ,  C07C51/50 ,  C07C57/075 ,  C07B63/00 ,  C07D211/94

Abstract: Inhibitor composition comprises a nitroxyl radical(s) (derivative) and a phenothiazine(s) and/or phenothiazine derivative(s). Inhibitor composition comprises a nitroxyl radical(s) (derivative) (N) and a phenothiazine(s) and/or phenothiazine derivative(s) (P) in a N/P weight ratio of at least 1. An Independent claim is included for a mixture comprising the above inhibitor composition and an ethylenically unsaturated compound(s).

公开(公告)号：DE19924532A1

公开(公告)日：2000-11-30

申请号：DE19924532

申请日：1999-05-28

Applicant: BASF AG

Inventor： THIEL JOACHIM ,  SCHROEDER JUERGEN ,  NESTLER GERHARD

IPC: B01D3/14 ,  B01D3/32 ,  C07C51/43 ,  C07C51/44 ,  C07C51/50 ,  C07C57/05 ,  C07C57/07 ,  B01D3/00

Abstract: A separating or rectifying column has both dual-flow- and hydraulically-sealed crossflow-plates. An Independent claim is also included for a process using such a column in fractionally condensing an acrylic acid-containing gas mixture obtained by heterogeneously-catalyzed, gas phase partial oxidation of C3 precursors of acrylic acid with molecular oxygen (see also WO200053560).

公开(公告)号：DE19915165A1

公开(公告)日：2000-06-29

申请号：DE19915165

申请日：1999-04-01

Applicant: BASF AG

Inventor： KELLER HARALD ,  JAWOREK THOMAS ,  SCHLIEPHAKE VOLKER ,  SCHROEDER JUERGEN ,  SUTORIS HEINZ FRIEDRICH ,  WAGENBLAST GERHARD ,  HUFF JUERGEN

IPC: C07B63/04 ,  C07D233/54 ,  C07D233/58 ,  C07D279/20 ,  C07B63/00 ,  C07D279/14

Abstract: An inhibitor composition (I) contains: (A) a polyvinylimidazole; and (B) a phenothiazine. An Independent claim is also included for a stabilized mixture (II) containing a radically polymerizable compound and a polyvinylimidazole (A).