The straight-run oil used as feedstock for pre-hydrogenation contains too many mechanical impurities
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I have a problem: the straight-run oil used as feed for pre-hydrogenation contains too many mechanical impurities. In just a few days, the pressure difference across the bed of my pre-hydrogenation reactor increased to 1 kg. What should I do? Has anyone encountered such a situation? Please share your suggestions on how to deal with it; I’m urgently seeking help from those who are more experienced! ! ! ! ! ! ! ! ! :call:
Handling suggestions: 1. Require the naphtha produced by upstream units to first be sent to a buffer tank, where it can settle before being sent on； 2. A filter is installed at the inlet of the raw material pump for pre-treatment, and it is switched out for cleaning from time to time.
Replying to 3# Zhongyuanren: It’s exactly as I told you:dizzy:. What should I do?
Reply to #4: Suggestions: 1. Report the current status of the device to the relevant supervisors； 2. Request guidance from the supervisor ； 3. Request production scheduling to coordinate the handling ； 4. Require the upstream equipment to find ways to reduce metal impurities in the product.
The differential pressure in the pre-hydrogenation reactor continues to increase. There aren’t too many mechanical impurities in the feed oil; it might be due to something related to the bottom of the tank. What other factors could be causing the differential pressure in the pre-hydrogenation reactor to keep rising?
I think another reason is the high air velocity; the processing volume in this production run exceeded the designed value. This has accelerated catalyst carbon deposition.
Reply to 7# 4965338: Everything is normal except for the differential pressure. I’m not operating under overload; the load is only at 90% of the maximum level. The claim of carbon buildup seems impossible to me – a little analysis will suffice to confirm this; just check the various indicators. I’m worried about salt formation!
I don’t think it’s salt deposition; salt deposition occurs when the pressure difference behind the reactor increases. Right now, it’s the pressure difference in the reactor that’s increasing
It is generally coking of dienes and the like.
This is usually due to a high content of dienes and polycyclic olefins. Generally, there is a backwash filter in place, which is used to remove mechanical impurities and gums. This issue can also occur in gasoline hydrogenation processes. The solution adopted by the Fushun Institute was to install a filtering screen at the reactor inlet, using a porous metal mesh as the filter