US 4,069,136 AGranted

Countercurrent hydrocarbon conversion with gravity-flowing catalyst particles

AssigneeUop LLC

InventorsRoger L. Peer, Irvin S. Fisch

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Abstract

A multiple-stage catalytic conversion system in which a hydrocarbon charge stock is countercurrently reacted in a plurality of catalytic reaction zones, in all of which the catalyst particles are downwardly movable via gravity-flow. The charge stock, in the absence of added, or recycled hydrogen, is reacted serially in the reaction zones in the order of increasing catalyst loading, the product ultimately being recovered from the effluent emanating from that reaction zone (1) into which fresh, or regenerated catalyst particles are introduced and, (2) which contains the greatest quantity of catalyst particles. Catalyst particles are transferred from one reaction zone to another in the order of decreasing catalyst loading, ultimately being withdrawn from the system through the reaction zone containing the least amount of catalyst particles.

Claims10

Dependent claims

A process for the catalytic reforming of a naphtha charge stock with a catalyst comprising a Group VIII noble metal on an alumina carrier to produce a gasoline of higher octane number in a multiple-stage reactor 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from one reaction zone are introduced into the next succeeding reaction zone, (3) deactivated catalyst particles are withdrawn from said system through the lower end of the last reaction zone and, (4) fresh, or regenerated catalyst particles are introduced into the upper end of the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 in said system, 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in the absence of added or recycled hydrogen, in said last reaction zone, from which deactivated catalyst particles are withdrawn from said system, at catalytic reforming conditions;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d. recovering a normally liquid, catalytically-reformed product from the effluent withdrawn from said first reaction zone;
said process being further characterized in that said first reaction zone contains the greater amount of catalyst particles and said last reaction zone contains the least amount of catalyst particles.

3 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 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 particles are movable via gravity-flow, said second zone containing a lesser quantity of catalyst particles than said first reaction zone;
b. transferring catalyst particles from the lower end of said second reaction zone into the upper end of a third reaction zone, through which said particles are movable via gravity-flow, said third zone containing a lesser quantity of catalyst particles than said second reaction zone;
c. transferring catalyst particles from the lower end of said third reaction zone into the upper end of a fourth reaction zone, through which said particles are movable via gravity-flow, said fourth zone containing a lesser quantity of catalyst particles than said third reaction zone, and withdrawing deactivated catalyst particles from the lower end of said fourth reaction 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.