US 7,321,058 B2
Method for producing acrolein and/or acrylic acid
Otto Machhammer, Mannheim (Germany); Christoph Adami, Weinheim (Germany); Claus Hechler, Ludwigshafen (Germany); and Peter Zehner, Ludwigshafen (Germany)
Assigned to BASF Aktiengesellschaft, Ludwigshafen (Germany)
Appl. No. 10/297,579
PCT Filed Jun. 13, 2001, PCT No. PCT/EP01/06708
§ 371(c)(1), (2), (4) Date Dec. 12, 2002,
PCT Pub. No. WO01/96271, PCT Pub. Date Dec. 20, 2001.
Claims priority of application No. 10028582 (DE), filed on Jun. 14, 2000.
Prior Publication US 2003/0187299 A1, Oct. 02, 2003
Int. Cl. C07C 51/16 (2006.01); C07C 51/42 (2006.01)
U.S. Cl. 562—545  [562/549] 38 Claims
OG exemplary drawing
 
1. A process for the preparation of at least one of acrolein and acrylic acid from at least one of propane and propene, the process comprising the following steps:
(a) separating at least one of propane and propene from a gas mixture A containing at least one of propane and propene by absorption in an absorbent,
(b) separating at least one of propane and propene from the absorbent to give a gas B containing at least one of propane and propene and
(c) oxidizing the gas B obtained in stage (b) to form at least one of acrolein and acrylic acid,
wherein no heterogeneously catalyzed dehydrogenation of propane without a supply of oxygen is carried out between steps (b) and (c), and
wherein the separating in step (b) is carried out by stripping with at least one of a pressure change and a temperature change, using at least one of steam, air and an oxygen/nitrogen mixture, and
wherein during the separating (a) the gas mixture A is brought into contact with the absorbent at a pressure of from 1 to 50 bar, and
wherein the stripping (b) is carried out at a pressure of from 0.1 to 10 bar.