公开(公告)号：ID27390A

公开(公告)日：2001-04-05

申请号：ID20010163

申请日：1999-07-21

Applicant: BASF AG

Inventor： ECK BERND ,  HEILEK JORG ,  SCHLEIPHAKE VOLKER ,  PROLL THEO ,  BROLLOS KLAUS ,  THIEL JOACHIM ,  MACHHAMMER OTTO

IPC: C07C51/225 ,  C07C51/43 ,  C07C57/05 ,  C07C57/07

Abstract: A process for the preparation of acrylic acid by:(a) preparation of a gaseous product mixture which essentially has the composition of a reaction mixture of catalytic gas-phase oxidation of C3-alkanes, C3-alkenes, C3-alkanols and/or C3-alkanals and/or intermediates thereof to acrylic acid, which comprises(b) condensation of the gaseous product mixture,(c) crystallization of the acrylic acid from the solution obtained in stage (b), with partial evaporation of the solution under reduced pressure,(d) isolation of the resulting crystals from the mother liquor,(e) recycling of at least a part of the mother liquor from stage (d) to stage (b) and(f) recycling of at least a part of the evaporated solution from stage (c) to stage (b).