Hydrogenation unit
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This post was last edited by shiwang528 on 2011-1-26 21:43. After the catalyst sulfidation is completed in a hydrogenation unit, what should be done with the sulfiding agent tank and the sulfiding agent pipelines that are not used during normal operation? (Do they need to be flushed clean?) If necessary, what should be used for rinsing? What are the specific steps for the rinsing process? What are the steps? ）?
This post was last edited by Da Lianyou on 2010-11-27 at 21:48. Let me tell you the correct answer. . . After the sulfidation is complete, maintain a H2S content in the circulating hydrogen of not less than 0.1% and a cold high-pressure of 7.35 Mpa, in preparation to switch to passivation oil. Close the inlet valve of the vulcanizing agent (DMDS), use deoxygenated water to circulate and flush the injection line, drain all remaining water, purge it with nitrogen, and take precautions against freezing in winter. Make sure the remaining parts are protected from freezing!
Reply to 1# shiwang528: After sulfidation is complete, the temperature at the reactor inlet is reduced at a rate of 15 degrees per hour to around 240 degrees, thereby reducing the amount of DMDS injected. The remaining vulcanizing agent is recovered or slowly injected entirely into the reaction system; the manual valve at the DMDS injection point is closed, the DMDS injection line is flushed with water, and finally any remaining water is drained, after which the blind plate at the DMDS injection point is secured in place.
After dilution with water, purge with nitrogen, under nitrogen protection
Reply to 4# yihuayan: Isn’t 240 degrees a bit high? The vulcanizing agent can decompose into hydrogen sulfide at temperatures over 200 degrees; it’s possible to reduce the temperature to around 180 degrees. Thank you