Global Patent Index - EP 1098867 A1

EP 1098867 A1 2001-05-16 - METHOD FOR PRODUCING ACRYLIC ACID

Title (en)

METHOD FOR PRODUCING ACRYLIC ACID

Title (de)

VERFAHREN ZUR HERSTELLUNG VON ACRYLSÄURE

Title (fr)

PROCEDE DE PRODUCTION D'ACIDE ACRYLIQUE

Publication

EP 1098867 A1 (DE)

Application

EP 99939391 A

Priority

  • DE 19833049 A
  • EP 9905204 W

Abstract (en)

[origin: DE19833049A1] In a process for production of acrylic acid by catalytic gas-phase oxidation of a 3C feedstock, the gaseous product is worked up by condensation followed by crystallization of acrylic acid by evaporation under vacuum, both the mother liquor from crystallization and the evaporated solution being at least partly recycled to the condensation stage. The production of acrylic acid comprises: (a) catalytic gas-phase oxidation of 3C alkanes, alkenes, alkanols and/or alkanals and/or precursors thereof to acrylic acid, (b) condensation of the gaseous product mixture, (c) crystallization of acrylic acid by partial evaporation of the solution obtained under vacuum, (d) separation of the crystals from the mother liquor, (e) recycling at least part of the mother liquor from (d) to stage (b) and (f) recycling at least part of the evaporated solution from (c) to stage (b).

IPC 1-7 (main, further and additional classification)

C07C 51/43; C07C 57/07

IPC 8 full level (invention and additional information)

C07C 51/225 (2006.01); C07C 51/43 (2006.01); C07C 57/05 (2006.01); C07C 57/07 (2006.01)

CPC (invention and additional information)

C07C 51/43 (2013.01)

Combination set (CPC)

C07C 51/43 + C07C 57/04

Citation (search report)

See references of WO 0005188A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

DE 19833049 A1 20000127; BR 9912344 A 20010417; CN 1311766 A 20010905; EP 1098867 A1 20010516; ID 27390 A 20010405; JP 2002521353 A 20020716; JP 4520637 B2 20100811; US 6433222 B1 20020813; WO 0005188 A1 20000203

INPADOC legal status


2002-08-21 [18W] WITHDRAWN

- Date of withdrawal: 20020619

2001-05-16 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20010131

2001-05-16 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE