Dehydrocyclization and reforming process
AssigneeMobil Oil Corporation
InventorsRalph M. Dessau, Randall D. Partridge, Ernest W. Valyocsik, James C. Vartuli
Life of this patent
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Abstract
An improved, low-pressure dehydrocyclization and/or reforming process based on a non-acidic metal containing crystalline microporous tin catalyst, in which the feed is rich in low octane hydrocarbons, such as paraffins, and in which the product has increased aromatic content and increased octane value over that of the feed.
Claims75
A process for reforming a naphtha feedstock of low octane value comprising contacting the feedstock, under reforming conditions, with a non-acidic catalyst composition consisting essentially of
- a reforming hydrogenation/dehydrogenation metal in combination with
- a non-acidic microporous crystalline material containing tin, and
- recovering a reformate having an octane value greater than that of the feedstock and having an aromatic content greater than that of the feed.
A process for upgrading a naphtha comprising in combination:
- providing a feedstream which is a paraffin rich naphtha;
- contacting the feedstream with a non-acidic catalyst consisting essentially of a hydrogenation/dehydrogenation metal and a tin-containing non-acidic crystalline microporous material, under conditions including a temperature of from 800.degree. F. to 1100.degree. F., a pressure of about 0 to 500 psig, and LHSV of 0.1 to 20;
- and
- cofeeding with said feedstream a mixture of hydrogen and diluent which is inert to aromatization under the conditions of the process wherein the hydrogen:hydrocarbon (feed) ratio (molar) ranges from 0.1 to 20 and wherein the diluent:hydrocarbon (feed) ratio (molar) ranges from 1 to 20;
- and recovering a reformate of octane number and aromatic content greater than that of the feedstream and greater than that of the reformate produced in the absence of said diluent.
A process for reforming naphthas comprising
- providing a feedstream which is a C.sub.6.spsb.+ paraffin rich naphtha;
- contacting the feedstream with a catalyst comprising a reforming hydrogenation/dehydrogenation metal and a tin containing non-acidic crystalline microporous material, in the presence of a diluent, under reforming conditions, and to increase the octane of the reformate produced and its aromatic content.
A method for increasing the aromatic content of a reformate with a research octane in the range of 50 to 90 comprising
- providing said reformate of research octane of 50 to 90 containing C.sub.6.spsb.+ aliphatics and contacting said reformate with a non-acidic catalyst composition, at a temperature of at least about 800.degree. F., at a pressure ranging from about 0 to about 500 psig, and at a liquid hourly space velocity (LHSV) ranging from 0.1 to 20;
- wherein said catalyst composition consisting essentially of a hydrogenation/dehydrogenation component and a tin containing non-acidic crystalline, microporous material;
- producing a product of research octane greater than that of the reformate and of aromatic components content greater than that of the reformate.
A process for manufacturing benzene, toluene, or mixtures thereof, said process comprising providing a feed comprising substantially isomer-free normal hexane, substantially isomer-free normal heptane, or mixtures thereof and contacting said feed under dehydrocyclization conditions of temperature, pressure and space velocity with a non-acidic dehydrogenation catalyst consisting essentially of a platinum group metal supported on a zeolite containing tin or indium, said zeolite having the crystal structure of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-38 or ZSM-48, and recovering said benzene, toluene or mixture thereof.
A process for manufacturing benzene or toluene or mixtures thereof, said process comprising, in combination:
- fractionally distilling a straight-run paraffinic gasoline and recovering a fraction rich in normal hexane or normal heptane or a mixture thereof;
- contacting said recovered fraction with a Type 5A molecular sieve whereby sorbing said normal paraffin or paraffins from said recovered fraction and recovering a substantially isomer-free normal paraffin or paraffins;
- and contacting under dehydrogenation conditions said substantially isomer-free normal paraffin or paraffins with a non-acidic dehydrogenation catalyst consisting essentially of a platinum group metal supported on a tin containing zeolite, said zeolite having the crystal structure of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-38 or ZSM-48.
Dependencies are inferred from the claim text.