Start-up procedure for reforming with platinum-iridium catalysts

Details Start-up procedure for reforming with platinum-iridium catalysts Start-up procedure for reforming with platinum-iridium catalysts

1977-12-23

1979-07-03

Davis, C.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Reforming

208140, 252415, C10G 3508

Patent

active

041599381

ABSTRACT:
A process wherein a bed of catalyst comprised of platinum and iridium is contacted and pretreated at elevated temperature in a zone, prior to the introduction and contact of the catalyst with feed, with hydrogen, water, halogen, suitably chlorine or hydrogen chloride, or both, and hydrogen sulfide. The bed of catalyst is treated up to, but not significantly beyond the point of breakthrough of hydrogen sulfide from the bed. In its preferred aspects, a bed of fresh or regenerated, reactivated catalyst is wetted with water and an admixture of hydrogen and halogen, preferably hydrogen chloride, saturated or near-saturated with water, is passed through the catalyst bed until the time that the bed has adsorbed, absorbed or has otherwise taken up these components, and they begin to appear in the exit gas. On breakthrough of the hydrogen chloride, the introduction of the hydrogen sulfide gas is continued to breakthrough from the exit side of the bed. Thereafter, feed is introduced at reforming conditions to initiate the reforming operation.

REFERENCES:
patent: 3897328 (1975-07-01), Mitchell
patent: 3936369 (1976-02-01), Hayes
patent: 3941682 (1976-03-01), Kmack
patent: 3956107 (1976-05-01), Mitchell
patent: 3998755 (1976-12-01), Hayes
patent: 4018670 (1977-04-01), Sinfelt et al.
patent: 4046673 (1977-09-01), Paynter et al.

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