What is the crystallization temperature of the gas phase in the CO2 stripping synthesis tower?
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Or where can this data be found? Thank you...
Based on the vapor phase material balance at the outlet of the synthesis tower, and by referring to the ternary phase diagram for the relevant components
Actual component data is hard to find; gas-liquid equilibrium calculations can be carried out using the \"Nitrogen Fertilizer Process Design Manual\". Given the temperature, the ammonia-to-carbon ratio in the liquid phase, and the water-to-carbon ratio, it is possible to calculate the ammonia-to-carbon ratio in the gas phase. The water content in the gas phase can be ignored. The crystallization temperature can be determined by referring to phase diagrams. It’s just my personal opinion; feel free to correct me.
For this material, the moisture content is very low, so its melting point can be considered to be that of pure methylammonium.
With a gas-phase ammonia-to-carbon ratio of 3.5, and ignoring the water content and inert gases, the ammonia content is 57.5% and that of CO2 is 42.5%; if it were to condense completely, its crystallization temperature would be around 120°C.
This is meaningless; if the crystals are washed with high-pressure water, that will suffice. It’s impossible to determine the exact concentration, as sampling for analysis isn’t possible.