Yellow acid appears whenever the synthesis furnace is shut down and then restarted
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Whenever the synthesis furnace is shut down and restarted, yellow acid appears, and the levels of calcium and magnesium exceed the normal limits by more than 200 times; this happens almost every time. It takes several days for the conditions to return to normal – I don’t understand what’s causing this Experts, please help analyze it! Thank you
Temperature? Acid temperature? It shouldn’t!
It is related to temperature, humidity, and whether there is nitrogen protection.
It wasn’t dried properly before driving; the moisture level was too high
After the furnace was shut down, the process gas was not completely removed, and there was no nitrogen protection after the gas supply was stopped.
After shutting down the furnace, purging the synthesis furnace with nitrogen and then evacuating it can prevent the problem of hydrochloric acid turning yellow when the furnace is restarted