公开(公告)号：ZA201302644B

公开(公告)日：2014-05-25

申请号：ZA201302644

申请日：2013-04-12

Applicant: BASF SE

Inventor： HERZOG STEFANIE ,  ALTWASSER STEFAN ,  OTTENBACHER MARKUS ,  HUTTEN FRANK ,  WENTINK ANNEBART ENGBERT ,  SCHAFER ALEXANDER

IPC: C07C20060101

Abstract: A process for preparing acrylic acid from ethanol and formaldehyde, in which, in a reaction zone A, the ethanol is partially oxidized to acetic acid in a heterogeneously catalyzed gas phase reaction, the product gas mixture A obtained and a formaldehyde source are used to obtain a reaction gas input mixture B which comprises acetic acid and formaldehyde and has the acetic acid in excess over the formaldehyde, and the formaldehyde present in reaction gas input mixture B is aldol-condensed with acetic acid present in reaction gas input mixture B to acrylic acid under heterogeneous catalysis in a reaction zone B, and unconverted acetic acid still present along-side the acrylic acid target product in the product gas mixture B obtained is removed therefrom, and the acetic acid removed is recycled into the production of reaction gas input mixture B.