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US 4,417,083 AGranted
Process for the dehydrocyclization of paraffins at low pressure
AssigneeElf France
InventorsJean-Rene Bernard, Michele Breysse
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AssigneeElf France
InventorsJean-Rene Bernard, Michele Breysse
Estimating the term…
A process for the production of aromatic hydrocarbons from petroleum fractions containing paraffins which comprises passing said charge in the presence of hydrogen at 400.degree. C.-550.degree. C. over a catalyst containing from 0.1 to 1.5% by weight of at least one metal selected from the group consisting of platinum, rhenium, iridium, tin and germanium and containing sulfur in a sulfur/metals atomic ratio of from 0 to less than 1, supported on a crystalline, aluminum silicate zeolite containing alkaline cations, said zeolite having a pore dimension larger than 6.5 Angstroms, wherein the catalysts are in fixed beds in two reactors or sets of reactors arranged in parallel and operate at a pressure on the order of from 0.5 to 8 absolute bars wherein when a reactor set (DHC.sub.1 ) is producing aromatic hydrocarbons the other reactor set (DHC.sub.2 ) is swept by the hydrogen produced by the first reactor set (DHC.sub.1) at a temperature adequate for reactivating the catalyst, then inverting the roles of the two sets.
A process for the production of aromatic hydrocarbons from petroleum fractions containing paraffins which comprises passing said petroleum fractions, in the presence of hydrogen, at 400.degree. C.-550.degree. C. at a pressure of from about 0.5 to 8 bars absolute, over a catalyst containing from 0.1 to 1.5% by weight of at least one metal selected from the group consisting of platinum, rhenium, iridium, tin and germanium, and containing sulfur in an atomic sulfur/metals ratio of from 0 to less than 1, supported on a crystalline, zeolitic aluminosilicate compensated by alkali metal cations, having a pore dimension larger than 6.5 Angstroms, said catalyst being in a fixed bed in two reactor sets arranged in parallel in a manner such that when a set of reactors (DHC.sub.1) is producing aromatic hydrocarbons, the other set of reactors (DHC.sub.2) is being regenerated by contact with the hydrogen from the first set of reactors (DHC.sub.1) at a temperature sufficient for reactivating the catalyst, and reversing the operation of the reactors.
A process for reactivation of a dehydrocyclization catalyst containing from about 0.1 to 1.5% by weight of at least one metal selected from the group consisting of platinum, rhenium, iridium, tin and germanium, and containing sulfur in an atomic sulfur/metal ratio of from 0 to less than 1, supported on a crystalline, zeolitic aluminosilicate compensated by alkali metal cations, having a pore dimension larger than 6.5 angstroms, said catalyst having been deactivated by the dehydrocyclization of a paraffin containing petroleum fraction in the presence of hydrogen to form aromatic hydrocarbons said process consisting essentially of:
Dependencies are inferred from the claim text.