摘要:
Disclosed are methods for dehydrogenation of alkanes into alkenes in reactor systems of improved resistance to carburization under dehydrogenation conditions. The reactor walls are provided with a carburization and abrasion resistant protective layer by applying a metal plating, cladding or other coatings, such as painting, of a metal, such as Sb, As, Bi, Cu, Cr, Ga, Ge, In, Pb, Se, Te, Sn, particularly tin as a stannide layer, for forming a carburation resistant protective layer to a thickness of about 0.5 to 15 mils, effective to isolate the steel portion from hydrocarbons during the dehydrogenation process while avoiding any substantial liquid metal embrittlement. The protective layer is formed anchored to the steel portion through an intermediate carbide-rich bonding layer.
摘要:
A method for reforming hydrocarbons comprising coating portions of a reactor system with a material more resistant to carburization, reacting the material with metal sulfides existing in the portions of the reactor system prior to coating, fixating and removing at least a portion of the sulfur in the metal sulfides, and reforming hydrocarbons in the reactor system under conditions of low sulfur.
摘要:
A naphtha feed is contacted in a penultimate aromatic forming stage under catalytic aromatic forming conditions with a first catalyst. The effluent from the penultimate stage is contacted in a final aromatic forming stage under catalytic aromatic forming conditions and at substantially the same pressure as is maintained in the penultimate stage with a second catalyst. The pressure is selected to provide optimal aromatic production per calendar day from the final stage.
摘要:
A catalyst composition, a method for its preparation and a hydrotreating process using same. The catalyst comprises a rigidly interconnected pack of irregularly shaped particles having an average diameter below 0.15 mm. Among the particles and throughout the pack are access channels comprising interconnected macropores having diameters in the 0.1 to 15 micron range which contribute at least 5 percent of the pore volume. The particles comprise materials selected from the group consisting of at least one refractory oxide component and one hydrogenation component. For each 100 parts of the oxide component the composition contains, in parts by weight, an amount of the hydrogenating component, calculated as metal, in the range from 0.1 to 50 parts.
摘要:
The volume ratio of CO.sub.2 /CO in cracking catalyst regenerator flue gas is increased without adverse effect on cracking conversion and selectivity by employing a chromium oxidation catalyst at a high concentration in a small proportion of particles circulating in a cracking system.
摘要:
A method is provided of selecting operating parameters for a reforming process having at least penultimate and final reforming stages, each containing a respective catalyst, for optimum OB/CD production of product reformate having a selected RON and/or over a particular run length. The catalyst lives are determined at constant LHSV for the penultimate and final stage catalysts for a give feed octane to each stage as a function of the change in RON from that of the feed to that of the C.sub.5 + effluent from the respective stage. The penultimate stage C.sub.5 + effluent RON is selected to be such that the lives of the catalysts in each stage are substantially equal. Preferably the yield of C.sub.5 + effluent from each stage and the life of the catalyst used in each stage is determined as a function of the reforming pressure of that stage. The operating pressures of the stages are then selected to be within about 30% of that which gives the highest OB/CD.
摘要:
A process is provided for catalytic reforming or dehydrocyclization of hydrocarbons using a catalyst comprising a noble metal, and an intermediate pore size crystalline silicate having a high silica to alumina ratio and a relatively low alkali content. Preferably, the crystalline silicate is in the form of small crystallite size, such as less than 5 microns. The reforming or dehydrocyclization process is sulfur tolerant so that the reforming can be carried out in the presence of sulfur or with periodic exposure to sulfur.
摘要:
A process for selectively converting adsorbable hydrocarbon feeds containing straight-chain and slightly branched-chain hydrocarbons to olefins by contacting the feeds with crystalline silicates.
摘要:
A process for regenerating a coke contaminated reforming catalyst comprising platinum on a molecular sieve, said process consisting essentially of contacting said catalyst with a halogen-free oxygen-containing gas at a temperature of less than 780.degree. F. for a sufficient period of time such that the aromatization activity is restored to within 20.degree. F. of the activity said catalyst possessed at the start of the previous run cycle.
摘要:
A pretreatment process is disclosed for increasing conversion and reducing the fouling rate of reforming catalysts wherein the catalyst is pretreated at a temperature from 1025.degree. F. to 1275.degree. F. in a reducing atmosphere prior to contacting the catalyst with a hydrocarbon feed in the presence of hydrogen.