Hydrogen injection water temperature
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I would like to ask: in a diesel hydrogenation unit, the reaction distillate needs to be watered before it reaches the cold high-pressure separator after passing through the heat exchanger. The reason is that large temperature changes can cause ammonium salts to crystallize and block the pipelines. What I want to know is what extent of temperature change is necessary for ammonium salts to crystallize – what is approximately this temperature?
The crystallization temperature must be calculated based on the nitrogen content in the feed.
NH4CL. 176~232. (NH4)2S. 120
I’m rather foolish; could you, sir, explain it to me?
It generally occurs between 140–222°C; methods such as water injection can be used to wash away ammonium salts and prevent under-scale corrosion
It’s the temperature at which the ammonium salts crystallize; there are more than one type of ammonium salt
This issue is quite complex; it is recommended to read more relevant papers, as no one has yet provided a particularly authoritative statement regarding this temperature point.
The specific salt formation temperature is unknown, but the design requirement is that the temperature must not be lower than 220 degrees before water injection
You can simply understand it as follows: the crystallization temperature for chlorides is 176–232, while that for sulfides is 120
The amine salt is mainly ammonium chloride; generally, the temperature of the crude oil before injection is controlled between 173 and 237℃