EP 1611078 A2 20060104 - METHOD FOR THE HETEROGENEOUSLY CATALYZED PARTIAL GAS PHASE OXIDATION OF PROPENE INTO ACRYLIC ACID
Title (en)
METHOD FOR THE HETEROGENEOUSLY CATALYZED PARTIAL GAS PHASE OXIDATION OF PROPENE INTO ACRYLIC ACID
Title (de)
VERFAHREN DER HETEROGEN KATALYSIERTEN PARTIELLEN GASPHASENOXIDATION VON PROPEN ZU ACRYLSÄURE
Title (fr)
PROCEDE D'OXYDATION EN PHASE GAZEUSE PARTIELLE, HETEROGENE ET CATALYSE DU PROPENE EN ACIDE ACRYLIQUE
Publication
Application
Priority
- EP 2004002931 W 20040320
- DE 10313209 A 20030325
Abstract (en)
[origin: DE10313209A1] A process for the heterogeneously catalyzed partial gas phase oxidation of propene to acrylic acid by passage of a gas phase mixture comprising 6-15 vol.% propene, 4-20 vol. % water and no greater than 10 vol. % of other components as well as molecular oxygen such that the molar ratio of oxygen to propene is 1.5-2.5 and the residual amount to 100 vol.% comprises molecular nitrogen though a first reaction stage. A process for the heterogeneously catalyzed partial gas phase oxidation of propene to acrylic acid by passage of a gas phase mixture (I) comprising propene, molecular oxygen and at least one inert gas having a molar ratio of oxygen to propene of at least 1. The process involves a first reaction stage at elevated temperature having a fixed catalyst bed of ring shaped catalyst having a multimetal oxide active material of formula (1). The catalyst has a volume specific activity in the flow direction of the mixture (I) which is either constant or at least increases once and the active mass composition does not change over the bed packing such that the conversion of propene is at last 90 mol.% in a single pass with a selectivity to acrolein and acrylic acid of at least 90 mol.% with direct or indirect cooling of the product mixture leaving the first reaction stage. Optional addition of molecular oxygen and/or inert gas and the product mixture comprising acrolein, molecular oxygen and at least one inert gas having a molar ratio of oxygen to acrolein of at least 0.5 is passed through a second reaction stage comprising a second fixed bed catalyst packing comprising ring shaped packing whose active mass comprises a multimetal oxide of formula (2). Multimetal oxide (2) whose volume specific activity in the direction of flow at least increases once and whose composition does not alter over the second reaction stage such that the single-pass conversion of acrolein is at least 90 mol.% and the selectivity of both reaction stages to the formation of acrylic acid (with respect to reacted propene) is at least 80 mol.% is characterized in that the reaction mixture (I) comprises 6-15 vol.% propene, 4-20 vol.% water and no greater than 10 vol. % of other components that are not propene, water, oxygen or nitrogen, as well as molecular oxygen such that the molar ratio of oxygen to propene is 1.5-2.5 and the residual amount to 100 vol.% comprises molecular nitrogen. Mo12X1aX2bX3cX4dX5eOn (1) Mo12VfX6gX7hOm (2) X1 = Bi, Co or Ni; X2 = W or Nb; X3 = Fe or Cr; X4 = K, Cs or Sr; X5 = Si, Al or Zr; X6 = W or Nb; X7 = Sb, Cu, Ni or Fe; a = 5-10; b = 0-4; c = 2-5; d = 0.02-0.15; e = 0.5-4; f = 1-5; g = 1-2; h = 1-4; m, n = number of O atoms dependent upon the valency and number of elements.
IPC 1-7
IPC 8 full level
C07C 51/25 (2006.01)
CPC (source: BR EP KR US)
C07C 51/252 (2013.01 - BR EP KR US); C07C 51/42 (2013.01 - KR); C07C 57/04 (2013.01 - KR); C07C 57/04 (2013.01 - BR)
Citation (search report)
See references of WO 2004085368A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
DE 10313209 A1 20040304; BR PI0406992 A 20060110; BR PI0406992 B1 20150303; CN 100347144 C 20071107; CN 1764628 A 20060426; EP 1611078 A2 20060104; KR 101011065 B1 20110125; KR 20050115308 A 20051207; MY 140688 A 20100115; US 2004191953 A1 20040930; US 2006135813 A1 20060622; US 7019168 B2 20060328; WO 2004085368 A2 20041007; WO 2004085368 A3 20041104
DOCDB simple family (application)
DE 10313209 A 20030325; BR PI0406992 A 20040320; CN 200480007866 A 20040320; EP 04722163 A 20040320; EP 2004002931 W 20040320; KR 20057017970 A 20040320; MY PI20040837 A 20040311; US 46565303 A 20030620; US 54306005 A 20050721