The function of reaction corrosion inhibitors
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Hello everyone, I have a question for you: What is the corrosion inhibitor used in hydrogenation units? What is its mechanism of action? I would be very grateful if you could share your insights. Thank you so much! ! !
Corrosion inhibitors adsorb on the metal surface to form a protective layer, reducing hydrogen sulfide corrosion
Corrosion inhibitors are primarily used at the top of the distillation tower to form a protective film, thereby reducing the corrosion caused by hydrogen sulfide on the overhead distillation lines and air coolers. To form a film, the initial dosage is doubled.
The reaction corrosion inhibitor is added to the high-pressure air cooler during water injection, where it forms a protective film to prevent corrosion caused by hydrogen sulfide and ammonium salts
Is it necessary to keep adding the slow-release agent before air cooling, or is it sufficient to do so intermittently? Is a heat exchanger before air cooling also needed?
Our paraffin oil hydrogenation reaction corrosion inhibitor is added at the outlet of the water injection tank and at the inlet of the water injection pump, and it is injected into the high-pressure air cooler for continuous water injection
Inject into the top of the fractionation tower or use air cooling to prevent corrosion caused by hydrogen sulfide or ammonium salt crystallization~~~~
The reaction corrosion inhibitor is added during water injection into the high-pressure air cooler, where it forms a protective layer to prevent corrosion caused by hydrogen sulfide and ammonium salts. I agree with the person above; the water injection system for air cooling in our facility has not been in use since the plant started operating.
The neutralizing corrosion inhibitor is mainly composed of organic amides and water-soluble imidazolines, with neutralizing organic amines, dispersants, cosolvents, and synergists added in combination. The lone pair of electrons on the nitrogen atom of organic amides can form Fe-N coordination bonds with the iron metal on the surface of the equipment, thereby creating a tight and strong protective layer. This layer effectively reduces corrosion caused by H2O, H2S, CO2, and HCl in the condensation area at the top of the tower as well as in the oil and gas pipelines, preventing these corrosive substances from coming into contact with the metal and thus suppressing corrosion.
A protective film is formed to protect the inner walls, the low-pressure inlet, and the top of the stripping tower. The amount of injection depends on the iron ions in the water sample