Multi-bed catalytic converter
AssigneeCasale SA
InventorsFrancesco Baratto, Pierdomenico Biasi, Davide Carrara, Sergio Panza
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Abstract
A multi-bed catalytic converter comprising: a plurality of catalytic beds which are traversed in series by a process gas, sequentially from a first catalytic bed to a last catalytic bed of said plurality, and at least one inter-bed heat exchanger (7) positioned between a first catalytic bed and a second catalytic bed of said plurality, wherein at least the last catalytic bed of said plurality is adiabatic and is made of fine catalyst with a particle size not greater than 2 mm.
Claims15
A multi-bed catalytic converter, comprising:
- a plurality of catalytic beds which are traversed in series by a process gas, sequentially from a first catalytic bed to a last catalytic bed of said plurality of catalytic beds;
- and
- at least one inter-bed heat exchanger positioned between the first catalytic bed and a second catalytic bed of said plurality of catalytic beds, and arranged to remove heat from the process gas leaving the first catalytic bed before entering the second catalytic bed;
- wherein at least the last catalytic bed of said plurality of catalytic beds is adiabatic and is made of a fine catalyst with a particle size not greater than 2 mm;
- wherein each of the plurality of catalytic beds includes at least one gas distributor and at least one gas collector arrange to provide that the catalytic bed is traversed by the process gas with a radial flow or axial-radial flow;
- wherein only the last catalytic bed of said plurality of catalytic beds is made of the fine catalyst, one or more other catalytic beds of the plurality of catalytic beds being made of catalyst with greater particle size.
A method for revamping a multi-bed catalytic converter, wherein said converter includes:
- at least three catalytic beds which are traversed in series by a radial flow or an axial-radial flow of a process gas, sequentially from a first catalytic bed to a last catalytic bed of said plurality of catalytic beds;
- and
- at least a first inter-bed heat exchanger or a first quencher with a gas stream arranged between a first catalytic bed and a second catalytic bed to cool the effluent of said first bed before admission into the second bed, and a second inter-bed heat exchanger or a second quencher with a gas stream arranged between the second catalytic bed and a third catalytic bed to cool the effluent of said second bed before admission into the third bed,
- wherein said catalytic beds are made of catalyst with a particle size greater than 2 mm,
- the method comprising:
- replacing the catalyst of only the last catalytic bed with catalyst having a particle size not greater than 2 mm.
Dependencies are inferred from the claim text.