US 4,069,135 A · Hydrogen-producing hydrocarbon conversion with gravity-flowing catalyst particles

Abstract

A multiple-stage catalytic conversion system in which a hydrocarbonaceous charge stock is reacted in a plurality of catalytic reaction zones, through all of which the catalyst particles flow downwardly via gravity-flow. The charge stock, in the absence of added, or recycled hydrogen, is reacted in the last reaction zone, from which deactivated catalyst particles are withdrawn for regeneration. The reaction product effluent emanating therefrom is further reacted in an intermediate reaction zone. Additional reaction of the product effluent, from the intermediate zone, is effected in the first reaction zone, through which fresh, or regenerated catalyst particles are introduced into the system. The effluent from the first reaction zone is separated to recover the intended product. The system may comprise three or more reaction zones in side-by-side relationship, with the catalyst particles being transported from the lower end of one zone to the upper end of the next succeeding reaction zone. The reaction zones may assume a stacked configuration, sharing a common vertical axis, with the catalyst particles being movable from one zone to the next zone via gravity-flow.

Claims10

Dependent claims

A process for the catalytic reforming of a naphtha charge stock with a catalyst comprising a Group VIII noble metal or an alumina carrier to produce a gasoline fraction of higher octane number in a multiple-stage system in which (1) catalyst particles flow downwardly, via gravity, through each reaction zone in said system, (2) catalyst particles from one reaction zone are introduced into the next succeeding reaction zone, (3) deactivated catalyst particles are withdrawn from said system through the lower end of the last reaction zone and, (4) fresh, or regenerated catalyst particles are introduced into the upper end of the first reaction zone, which process comprises the sequential steps of:

a. reacting said charge stock, in the absence of added or recycled hydrogen, in said last reaction zone, from which deactivated catalyst particles are withdrawn from said system, at catalytic reforming conditions;
b. further reacting the effluent from said last reaction zone in at least one intermediate reaction zone, at catalytic reforming conditions;
c. further reacting the effluent from said intermediate reaction zone in said first reaction zone, through which fresh or regenerated catalyst particles are introduced into said system, at catalytic reforming conditions;
and,
d. recovering a normally liquid, catalytically-reformed product from the effluent withdrawn from said first reaction zone.

2 more elements

A multiple stage catalytic reforming of a naphtha charge stock with a catalyst comprising a Group VIII noble metal on an alumina carrier to produce a gasoline fraction of higher octane number than said naphtha which comprises the steps of:

a. introducing fresh, or regenerated catalyst particles into the upper end of a first reaction zone, through which said particles are movable via gravity-flow, and transferring catalyst particles from the lower end of said first zone into the upper end of a second reaction zone, through which said catalyst particles are movable via gravity-flow;
b. transferring catalyst particles from the lower end of said second reaction zone, and introducing them into the upper end of a third reaction zone, through which catalyst particles are movable via gravity-flow;
c. transferring catalyst particles from the lower end of said third reaction zone and introducing them into the upper end of a fourth reaction zone, through which catalyst particles are movable via gravity-flow, and withdrawing deactivated catalyst particles from the lower end of said fourth zone;
d. reacting a hydrocarbon charge stock, in the absence of added or recycled hydrogen, in said fourth reaction zone, at catalytic reforming conditions;
e. further reacting the resulting fourth reaction zone effluent in said third reaction zone at catalytic reforming conditions;
f. further reacting the resulting third reaction zone effluent in said second reaction zone at catalytic reforming conditions;
g. further reacting the resulting second reaction zone effluent in said first reaction zone at catalytic reforming conditions;
and,
h. recovering a normally liquid, catalytically-reformed product from the resulting first reaction zone effluent.

6 more elements

Dependencies are inferred from the claim text.

Hydrogen-producing hydrocarbon conversion with gravity-flowing catalyst particles

Life of this patent

Hydrogen-producing hydrocarbon conversion with gravity-flowing catalyst particles

Life of this patent

Abstract

Claims10