Regeneration of a dehydrogenation catalyst

Details Regeneration of a dehydrogenation catalyst Regeneration of a dehydrogenation catalyst

2005-07-12

2005-07-12

Silverman, Stanley S. (Department: 1754)

Catalyst, solid sorbent, or support therefor: product or process

Regenerating or rehabilitating catalyst or sorbent

Gas or vapor treating

C502S050000, C502S052000, C502S053000

Reexamination Certificate

active

06916756

ABSTRACT:
A process for regenerating a dehydrogenation catalyst comprises the steps (a)-(f):(a) flushing with inert gas at a pressure of from 0.5 to 2.0 bar and a gas hourly velocity of from 1000 to 50 000 h−1;(b) passing an oxygen-containing gas mixture comprising an inert gas through the catalyst at a pressure of from 2 to 20 bar and a gas hourly velocity of from 1000 to 50 000 h−1for from 0.25 to 24 hours while increasing the oxygen concentration stepwise or continuously from an initial value of from 0.01 to 1% by volume of O2to a final value of from 10 to 25% by volume of O2;(c) optionally passing an oxygen-containing gas mixture comprising an inert gas through the catalyst at a pressure of from 0.5 to 20 bar and a gas hourly velocity of from 10 to 500 h−1for from 0.25 to 100 h, with the oxygen concentration being from 10 to 25% by volume of O2;(d) optionally changing the pressure repeatedly, rapidly and in opposite directions by a factor of from 2 to 20 within the range from 0.5 to 20 bar;(e) flushing with an inert gas;(f) activating the catalyst by means of hydrogen;where at least one of the steps (c) or (d) is carried out and the entire regeneration process is carried out at from 300 to 800° C.

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