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alirsalehi
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Join Date: Dec 2008
Posts: 2

Hydrotreating Reactor Corrosion

12/22/2008 6:45 AM

What is the most important corrosion threat in the refinery hydrotreating reactor? specially in case of 321 shell cladding.
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PWSlack
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#1

Re: Hydrotreating Reactor Corrosion

12/23/2008 11:32 AM

It probably isn't caustic embrittlement.

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ChemE119
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Join Date: Nov 2006
Location: michigan
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#2

Re: Hydrotreating Reactor Corrosion

12/23/2008 9:15 PM

What is 321 shell cladding?

Hydrotreating produces acid gas (H2S) which is very corrosive.

Downstream of the reactor in a stabilizer tower to remove the light ends, you may see salt deposition in overhead systems due to ammonium chlorides and other salts concentrating in the water phase and condensing out. Usually a wash water is necessary to dissolve the salts and remove them via reflux drum water boot.
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alirsalehi
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Join Date: Dec 2008
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#3
In reply to #2

Re: Hydrotreating Reactor Corrosion

12/24/2008 12:21 AM

Thanks for your help.

321 is a type of stainless steel overlayed on the inner surface of the reactor to increase its corrosion resistance. If you know any kind of aggresive corrosion on the inner surface of hydrotreating reactor?

Which one may be more aggresive? Sulfidation, Polythionic Acid Cracking, High temperature hydrogen attack, High temperature H2/H2S corrosion or etc?
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