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：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：SG50765A1

公开(公告)日：1998-07-20

申请号：SG1996010696

申请日：1996-09-27

Applicant: BASF AG

Inventor： HAMMON ULRICH ,  SCHLIEPHAKE VOLKER ,  PIES WOLFGANG ,  RAUH ULRICH

IPC: C07B63/00 ,  C07C51/44 ,  C07C57/04 ,  C07C57/07

Abstract: A process for the rectification and sepn. of unsatd. carboxylic acids (I) from the solvents in which (I) are absorbed after the synthesis reaction. The process involves interrupting the rectification and flushing out the rectification column with basic soln.

公开(公告)号：CA2259162A1

公开(公告)日：1997-12-24

申请号：CA2259162

申请日：1997-06-19

Applicant: BASF AG

Inventor： RAUH ULRICH ,  PIES WOLFGANG ,  HAMMON ULRICH ,  SCHLIEPHAKE VOLKER

IPC: F23G7/06 ,  C07C51/42 ,  C07C57/04 ,  C07C57/07 ,  F23D17/00 ,  F23G5/00 ,  F23G7/04

Abstract: In a method for removing low, medium and high-boiling by-products obtained when producing acrylic acids or methacrylic acids, the gaseous low-boiling byproducts are burned, whereby low and medium-boiling by-products hat have been dissolved in water, if desired together with high-boiling by-products that have been treated with the dissolvent, are taken to the burning stage.