How to determine the ammonia injection amount at the top of the atmospheric distillation column for condensate oil?
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How to determine the ammonia injection amount at the top of the atmospheric distillation column for condensate oil? Currently, the search results for answers show rather vague control outcomes with a pH value of 6.5 to 8 ； But is it being controlled using the current crude oil evaluation data? That’s what true design is all about; after all, in terms of the manufacturing process, what needs to be determined now is how much ammonia should be used Related to acidity, related to...? How to determine the ammonia injection amount.
Adjusted according to acidity; no fixed amount!
It is recommended to add corrosion inhibitors and neutralizers to the top of the atmospheric pressure tower; adding ammonia alone will not resolve dew point corrosion
First of all, thank you for your reply. Actually, I haven’t been working in atmospheric and vacuum distillation for long. The data shows that ammonia injection is a relatively low-effective method. Three bets, still all of them. It’s that what’s written in the books are only the results and appearances, without any explanations of the principles behind them. The current issue is how to add the neutralizing agent; so, here’s an analysis of the raw materials – how can we predict the amount of neutralizing agent that needs to be added?
This is usually done by the neutralizing agent manufacturer, who takes your water sample back to conduct tests on it, and then carries out the procedures on-site in accordance with standards; the key parameters to monitor are the pH value and iron ion concentration after the treatment
Thank you so much! Experiments are the basis for operations. But it still isn’t good enough for design; how can we take its upper limit into account?
Generally, the sequence of adding substances to the top of a atmospheric pressure tower is to first add a neutralizing agent, then a corrosion inhibitor, and finally water. Nowadays, it is rare to add ammonia alone, as this can pose a risk of ammonium salt crystallization downstream; currently, organic amines or combined neutralizing and corrosion-inhibiting agents are usually used. The adjustment of the injection volume can be determined by referring to the acid value of the crude oil after dehydration, and then adjusted based on the iron ions in the wastewater from the tower top reflux tank. Maintain PH at around 7.5-8.5.