Do hydrogenation corrosion inhibitors react with MDEA?
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Has there been any precedent for adding corrosion inhibitors to the circulating hydrogen system? What were the results? Let’s discuss it together.
At the high-pressure area, should that area be added?
We have corrosion inhibitors with a reaction component, which are added at the inlet of the high-pressure water injection pump; they enter the reaction system along with the water being injected, that is, during continuous water injection prior to high-pressure air cooling. Intermittent water injection is carried out in front of a high-pressure heat exchanger before high-pressure air cooling. Hydrocracking unit
We are also considering this option; it has not been implemented yet and requires further justification.
Are you worried that after the injection, circulating hydrogen will carry liquid into the desulfurization tower, causing the corrosion inhibitor to react with the lean liquid?
It depends on the results of your acidic water sampling and analysis; if the iron ion level is high, then it may be necessary to add something. After all, the water used for flushing before air cooling can also dissolve ammonia salts, which in turn leads to the formation of hydrogen sulfide and corrosion. I think it’s still necessary to add it.
As for your concern about a reaction with ammonia solution, I don’t think there’s much of a problem. The injection concentration of our corrosion inhibitor is less than 20 ppm, primarily to form a protective film.
We installed a corrosion inhibitor on the water injection line before high-pressure air cooling, and the effect was good after its addition – the iron ions in the acidic water decreased significantly.