Hydrocracking process startup method

Details Hydrocracking process startup method Hydrocracking process startup method

1997-12-19

1999-03-30

Griffin, Walter D.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Plural serial stages of chemical conversion

208108, 208111, C10G 6510

Patent

active

058883770

ABSTRACT:
The safety, convenience and environmental acceptability of starting a two-stage hydrocracking process unit is increased by employing aqueous ammonia as a selective catalyst poison. The aqueous ammonia is injected into the recycle gas system of the hydrocracking process. The invention eliminates the possibility of forming a large airborne cloud of ammonia gas upon an accidental release of the ammonia stream as is possible with the injection of anhydrous ammonia. The invention also stabilizes the operation of the unit through the use of a maintenance injection rate sufficient to maintain an inlet ammonia content above about 40 ppm.

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