Other

Elf Atochem S.a.

Institut Francais Du Pe'trole

Atochem

Gerard Hecquet

Michel Simon

Jean-Pierre Schirmann

Charlotte Pham

Mark William Andersen

Roland Kotwica

Mireille Stojanovic

Rashmikant M Contractor

Daniel Campos

Eric Etienne

Gilles Descat

Jean B Myers

Rashmikant Maganlal Contracter

Stanislas Pietrzyk

Mohammed Dekiouk

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 oxide composition containing molybdenum, cobalt and bismuth, which is suitable for the manufacture of acrolein from propylene by a redox reaction

A mixed oxide solid composition of formula (I):

Process for the manufacture of acrolein from propylene by a redox

Solid mixed oxides composition of formula (I):

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

For the oxidative dehydrogenation of saturated carboxylic acids to form .alpha.,.beta.-unsaturated carboxylic acids, saturated acids are contacted with a gas containing molecular oxygen and, where appropriate, an inert diluent gas, in the vapor phase, at a reaction temperature of 250.degree. to 600.degree. C., in the presence of a catalyst system comprising a non-supported catalyst of the formula FeP.sub.x Me.sub.y O.sub.z, wherein: Me is at least one of the following elements: Li, Na, K,, Rb, Cs, Mg, Ca, Sr and Ba; x has a value from 0.2 to 3.0; y has a value from 0.01 to 0.2; and z is the quantity of oxygen bonded to the other elements and corresponding to their oxidation state, in an entrained-bed reactor and, where appropriate, in the presence of steam in a molar ratio to the saturated acid not exceeding 0.5. The catalyst is beneficially associated with at least one zeolite, preferably in a concentration sufficient to improve the attrition resistance of the catalyst, e.g., in an amount by weight of about 1-10% of the catalyst.

Attrition-resistant catalyst system and its application to the oxidative

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Bethune, France

Gerard Hecquet