Other

Elf Atochem S.a.

Charlotte Pham

Gerard Hecquet

Michel Simon

Mark William Andersen

Roland Kotwica

Mireille Stojanovic

Jean-Pierre Schirmann

Rashmikant M Contractor

Daniel Campos

Jean B Myers

Rashmikant Maganlal Contracter

An improved method for the selective vapor phase oxidation of propylene to acrolein in a recirculating solids reactor system using a bismuth molybdate multimetal oxide involving specific reactant concentrations (preferably 5 mol % to 30 mol % propylene, 0 to 20 mol % oxygen, and the remainder inert gas), particle size (1 to 300 micrometers), temperature (250 to 450&deg; C.) and gas (1 to 15 seconds) and solids (2 to 60 seconds) residence times. Such a process leads to improved selectivity and propylene conversion.

Vapor phase oxidation of propylene to acrolein

An improved method for the selective vapor phase oxidation of acrolein to acrylic acid in a recirculating solids reactor system using a particulate molybdenum vanadate multimetal oxide as oxidant involving specific reactant concentrations (preferably 5 mol % to 30 mol % propylene, 0 to 20 mol % oxygen, 0 to 70 mol % water, and the remainder inert gas), solids particle size (20 to 300 micrometers), temperature (250 to 450&deg; C.) and gas (1 to 15 seconds) and solids (2 to 60 seconds) residence times. Such a process leads to improved selectivity, conversion and solids conversion ratio.

Vapor phase oxidation of acrolein to acrylic acid

An improved method for manufacturing acrylic acid by vapor phase oxidation of propylene in a single step or reaction stage using as solid phase oxidant a mixture of two particulate solids comprising a bismuth molybdate multimetal oxide (e.g., Mo,Co,Bi,Fe,W,Si,K,O,) and a molybdenum vanadate multimetal oxide (e.g., Mo,V,Sr,W,Cu,O,). Such a process is advantageously carried out in a recirculating solids reactor system wherein the particulate mixture of solids in an oxidized state reacts with a feed gas containing propylene in a vertical riser reactor and after separation from the acrylic acid gaseous product the particulate mixture of solids in a reduced state is regenerated by contact with an oxygen containing gas in a separate regeneration reactor before recirculation to the riser for further reaction.

Vapor phase catalytic oxidation of propylene to acrylic acid

Solid mixed oxides composition of formula (I):

Process for the manufacture of acrylic acid from acrolein by a redox

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Saverne, France

Charlotte Pham