Impact of frequent raw material switching on catalysts
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For our diesel hydrogenation process, we use RS-2000. Production is carried out by alternating between National III and National IV standards from time to time; it seems that this approach has a significant impact on the catalysts, though I cannot pinpoint exactly how. Please share your thoughts.
This post was last edited by Zhongyuanren on 2016-9-19 at 10:55. What the original poster discussed was not adjusting the raw materials, but rather adjusting the production plan. Gradually adjusting the reaction temperature and pressure has a minor impact on catalyst damage. The adjustment principles are: 1. Operation must not exceed temperature, pressure, or flow rate limits ； 2. Raise the temperature first and then the pressure; lower the temperature first and then the pressure
Frequent changes in temperature can have an impact on the activity of the catalyst; if the temperature rises and then drops again, the catalyst’s activity will not return to its original level
Over-temperature and over-pressure must be controlled, as well as the rate of temperature rise; in systems with pulsating flow, it is necessary to prevent excessively high flow speeds
The proportions of raw materials and the frequent heating and cooling of the reactor are issues; frequent temperature changes have an impact on distillation, and raw material changes can also affect backwashing.
Yes, we change our production plans quite frequently; sometimes the adjustments are made every 2 days. The main thing done is to replace the catalyst-based oil with molecular sieve material or normal third-line materials, and the temperature is increased by about 20 degrees. It seems that this approach has a significant impact on the lifespan of the catalysts