Hello kadiaa,
I'm assuming that the catalyst is some liquid phase and not a slurry? I would hazard to guess that your ethylene is polymerizing at the point where its mixing with the catalyst. Slurry can plug on its own. Check your operating conditions at the injection point. These types of...
He EdStainless and ironic metallurgist,
Thanks again for your help on this topic. From what I gather, our choices are to refuse chlorides all together, make significant metallurgy upgrades to our unit or take on significant risk of SCC. I don't think we can accept the additional risk, so that...
Hey EdStainless,
But the rate of SCC would have to be based on relatively severity? If every time you have a minor upset in the unit you have a significant failures due to SCC then you would be forced to cascade metallurgy upgrades to significant parts of the whole unit. Even a loss of cooling...
Hey shvet,
I have a strong background in process engineering and licensing, specializing in heavy oil processes. In my experience with engineers and metallurgists, I think most would agree with my assessment. Selecting appropriate metallurgy can be very challenging even in a well defined...
Hello shvet,
Thank you for your feedback. I think the scale and purpose is important here, the pilot unit feed rates are on the order of 200cc/hr. Our lines are generally ~1/2" tubing, vessels are constructed from piping elements. We pilot a large range of feedstocks with highly variable...
Thank you for your input EdStainless and ironic metallurgist!
I've been reading up on the issue extensively and I'm coming up with the same very "complicated" answer. I was hoping to get an idea of how fast these issues propagate once they start. I can deal with corrosion and SCC as long as I'm...
Hey EdStainless,
We have some experience operating at about 10 wtppm chlorides on a oil feed basis for about a month. That works out to about 50 mg/l in the sour water. At that level, we saw minimal corrosion or cracking issues in the unit. I'm trying to get some historical pH values from the...
I'm trying to determine the maximum chloride content we can accept in one of our hydroprocessing pilot units before pitting/crevice corrosion and CSCC becomes a significant issue. By significant I mean that we could see issues develop in the span of a few months of operation or expect to replace...
