Single-step process to upgrade naphthas to an improved gasoline blending stock
AssigneeTexaco Inc.
InventorsRichard Vance Lawrence, Pei-Shing Eugene Dai
Life of this patent
Estimating the term…
Abstract
Disclosed is a one-step process intended as an alternative to catalytic reforming which upgrades naphthas by simultaneously saturating aromatics, isomerizing paraffins and selectively cracking heavier hydrocarbons which comprises contacting heavy naphtha feedstock in a reforming zone with a catalyst comprising a solid acid, optionally with a binder of Group III and/or IV of the Periodic Table, having a metal from Group VIII of the Periodic Table deposited thereon, wherein the reaction conditions are much milder than those typically used in catalytic reforming.
Claims24
In a process for converting naphtha feedstock to gasoline blending stock, a method of simultaneously
- a) decreasing the concentration of total aromatics in the product by saturation of aromatics,
- b) decreasing the concentration of C.sub.7, C.sub.11 and C.sub.12 normal paraffins in the product, and
- c) increasing the concentration of total C.sub.4 and C.sub.7 isoparaffins by isomerization of normal paraffins to more highly branched isomers by selective hydrocracking, which comprises
- contacting said naphtha feedstock in a contact zone at a temperature of 300.degree.-700.degree. F., a pressure of 50-500 psig, and an LHSV of 1-6 volumes of liquid feed to volume of catalyst per hour and hydrogen to hydrocarbon mole ratio of 0.5 to 10 with a catalyst comprising
- a solid acid support comprising at least one zeolite selected from the group consisting of a Y-zeolite, zeolite beta, silcalite, ZSM-5 and mordenite, having deposited thereon a metal selected from Group VIII of the Periodic Table, optionally bound to an oxide of Group III and/or IV of the Periodic Table;
- and
- producing a product characterized by reduced benzene and aromatics contents.
Dependencies are inferred from the claim text.