Hydrocracking catalyst passivation problem
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Inject anhydrous liquid ammonia for passivation. Stop ammonia injection from switching to 75% vgo. How long will it take to fully reach the maximum activity of the catalyst?
70% of the feed is switched and the ammonia injection is gradually stopped within 2 hours. Pay close attention to the changes in the reactor bed temperature. After confirming that the reaction temperature can be completely controlled, stop ammonia injection and close the ammonia injection point stop valve; when processing low-sulfur and high-nitrogen feed oil, decide whether to stop the injection of vulcanizing agent based on the concentration of hydrogen sulfide in the circulating hydrogen. After stopping the injection of vulcanizing agent, close the ammonia injection point stop valve.