公开(公告)号：CZ2000898A3

公开(公告)日：2000-06-14

申请号：CZ2000898

申请日：1998-09-10

Applicant: BASF AG

Inventor： ECK BERND ,  MACHHAMMER OTTO ,  PROLL THEO ,  SCHLIEPHAKE VOLKER ,  THIEL JOACHIM ,  BROELLOS KLAUS

IPC: B01D5/00 ,  C07C51/44 ,  C07C57/07

Abstract: A process for the fractional condensation of a gas mixture which, in addition to acrylic acid or methacrylic acid, also contains at least one further condensable component and additionally a high proportion of one or more noncondensable components, wherein the gas mixture is passed through a column having separatory internals and the condensable components are condensed by cooling.

公开(公告)号：DE19754014A1

公开(公告)日：1999-06-10

申请号：DE19754014

申请日：1997-12-05

Applicant: BASF AG

Inventor： ECK BERND ,  MARTIN FRIEDRICH-GEORG DR ,  MECKL STEFAN DR ,  SCHRAUT ARMIN DR ,  ULBRICH MICHAEL-DIETER DR

IPC: C07C51/43 ,  C07C57/07

公开(公告)号：CZ7399A3

公开(公告)日：1999-05-12

申请号：CZ7399

申请日：1997-07-09

Applicant: BASF AG

Inventor： ECK BERND ,  MACHHAMMER OTTO ,  PROLL THEO ,  SCHLIEPHAKE VOLKER

IPC: C07C57/04 ,  C07C51/21 ,  C07C51/43 ,  C07C57/05 ,  C07C57/07

Abstract: A process for preparing acrylic acid or methacrylic acid comprises(a) preparing a gaseous product mixture having essentially the composition of a reaction mixture of the catalytic gas phase oxidation of C3-/C4-alkanes, -alkenes, -alkanols and/or -alkanals and/or precursors thereof to form acrylic acid or methacrylic acid, characterized by(b) condensing said product mixture,(c) crystallizing acrylic acid or methacrylic acid from the solution obtained in step (b), and(d) removing the resulting crystals from the mother liquor.

公开(公告)号：CZ5099A3

公开(公告)日：1999-05-12

申请号：CZ5099

申请日：1997-06-24

Applicant: BASF AG

Inventor： LEHNERT KLAUS ,  MULLER-ENGEL KLAUS JOACHIM ,  NESTLER GERHARD ,  ECK BERND

IPC: C07C57/04 ,  C07C51/43 ,  C07C57/07 ,  C07C57/075

Abstract: PCT No. PCT/EP97/03304 Sec. 371 Date Dec. 30, 1998 Sec. 102(e) Date Dec. 30, 1998 PCT Filed Jun. 24, 1997 PCT Pub. No. WO98/01414 PCT Pub. Date Jan. 15, 19981,4-Dibenzothiazine-comprising crude acrylic acid is purified by crystallization by raising its diacrylic acid content to at least 1% by weight prior to the crystallization step.

公开(公告)号：AU9624998A

公开(公告)日：1999-04-05

申请号：AU9624998

申请日：1998-09-10

Applicant: BASF AG

Inventor： ECK BERND ,  MACHHAMMER OTTO ,  PROLL THEO ,  SCHLIEPHAKE VOLKER ,  THIEL JOACHIM ,  BROLLOS KLAUS

IPC: B01D5/00 ,  C07C51/44 ,  C07C57/07

Abstract: A process for the fractional condensation of a gas mixture which, in addition to acrylic acid or methacrylic acid, also contains at least one further condensable component and additionally a high proportion of one or more noncondensable components, wherein the gas mixture is passed through a column having separatory internals and the condensable components are condensed by cooling.

公开(公告)号：CA2303445A1

公开(公告)日：1999-03-25

申请号：CA2303445

申请日：1998-09-09

Applicant: BASF AG

Inventor： BROLLOS KLAUS ,  THIEL JOACHIM ,  SCHLIEPHAKE VOLKER ,  MACHHAMMER OTTO ,  PROLL THEO ,  ECK BERND

IPC: C07C51/43 ,  C07C51/44 ,  C07C57/07

Abstract: The invention relates to a method for producing acrylic acid and methacrylic acid by producing a gaseous product mixture which essentially has the composition of a reaction mixture of the catalytic gas phase oxidation of C3/C4- alkanes, -alkenes, -alkanols or -alkanals or precursors thereof to form acrylic acid or methacrylic acid. The product is separated from the gaseous product mixture according to a method comprising the following steps: a) condensing the gaseous product mixture; b) crystallising the acrylic acid or methacrylic acid from the solution obtained in (a); c) separating the resulting crystals from the mother liquor and d) returning at least a part of the mother liquor from stage (c) to stage (a).

公开(公告)号：ES2126358T3

公开(公告)日：1999-03-16

申请号：ES96115817

申请日：1996-10-02

Applicant: BASF AG

Inventor： ECK BERND ,  MALTRY BERNHARD

IPC: B01D9/02 ,  B01D9/00 ,  C07B63/00 ,  C07C7/14 ,  C07C51/43 ,  C07C57/07

公开(公告)号：BR9703321A

公开(公告)日：1999-01-05

申请号：BR9703321

申请日：1997-05-27

Applicant: BASF AG

Inventor： ECK BERND ,  PROLL THEO ,  DAMS ALBRECHT ,  MACHHAMMER OTTO

IPC: C07C57/07

公开(公告)号：CZ9700436A3

公开(公告)日：1997-09-17

申请号：CZ43697

申请日：1997-02-12

Applicant: BASF AG

Inventor： MACHHAMMER OTTO ,  DAMS ALBRECHT ,  ECK BERND ,  PROLL THEO

IPC: C07C57/04 ,  C07C51/43 ,  C07C57/05 ,  C07C57/07

CPC classification number: C07C51/43 ,  C07C57/04

公开(公告)号：CZ43697A3

公开(公告)日：1997-09-17

申请号：CZ43697

申请日：1997-02-12

Applicant: BASF AG

Inventor： MACHHAMMER OTTO ,  DAMS ALBRECHT ,  ECK BERND ,  PROLL THEO

IPC: C07C57/04 ,  C07C51/43 ,  C07C57/05 ,  C07C57/07

Abstract: A process for purifying (meth)acrylic acid by phase separation techniques comprises the following steps: (a) a mixture containing (meth)acrylic acid is separated into distinct phases in the presence of an organic solvent, with the composition of the (meth)acrylic acid-rich phase remaining essentially unchanged, and this acid-rich phase is separated; (b) the remaining phase from step (a) is separated into indistinct phases; and (c) one of the phases from step (b) is returned to step (a). Also claimed is preparation of (meth)acrylic acid. Preferably in step (c) the acid-rich phase is returned to step (a). 1-100 (100) wt.% of the phase remaining from step (a) is used in step (b). Pure end product is added to steps (a) and (b). Step (a) involves crystallisation, freezing or sublimation, preferably static and/or dynamic crystallisation, and most preferably a combined static and dynamic crystallisation in which the residue from the dynamic crystallisation is added to the static crystallisation step and the crystallised product from the static crystallisation is returned to the dynamic crystallisation.