Reforming and dehydrocyclization
AssigneeMobil Oil Corporation
InventorsNai Y. Chen, Ralph M. Dessau, Randall D. Partride, Ernest W. Valyocsik
Life of this patent
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Abstract
Improved, dehydrocyclization and low-pressure reforming processes based on a non-acidic metal containing crystalline microporous indium catalyst, in which the feed is rich in C.sub.6 -C.sub.7 low octane hydrocarbons, such as paraffins, and in which the reformate has increased aromatic content and increased octane value over that of the feed are disclosed.
Claims66
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 an indium containing zeolite, 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-acidc dehydrogenation catalyst consisting essentially of a platinum group metal supported on an indium containing zeolite, said zeolite having the crystal strucutre of ZSm-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-38 or ZSM-48.
A process for reforming a naphtha feedstock of low octane value comprising contacting the feedstock, under reforming conditions, with a catalyst composition consisting of
- a reforming hydrogenation/dehydrogenation metal in combination with
- a non-acidic microporous crystalline material containing indium which exhibits the X-ray diffraction of ZSM-5, ZSM-11, ZSM-12, ZSM-20, ZSM-23, ZSM-48, ZSM 50, 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 catalyst consisting of a hydrogenation/dehydrogenation metal and an indium-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.sup.+ paraffin rich naphtha;
- contacting the feedstream with a catalyst comprising a reforming hydrogenation/dehydrogenation metal and an indium containing non-acidic crystalline microporous material, 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.sup.+ aliphatics and contacting said reformate with a 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 comprises a hydrogenation/dehydrogenation component and an indium 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.
Dependencies are inferred from the claim text.