Liquefaction of gaseous ammonia
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What is the principle behind pressurizing gaseous ammonia with a compressor and cooling it to turn it into liquid ammonia?
Liquefaction refers to the process in which a substance changes from a gaseous state to a liquid state, releasing heat to the surroundings. There are two ways to achieve liquefaction: one is by lowering the temperature, and the other is by compressing the volume. Isn’t it that principle?
You mean that lowering the temperature causes ammonia to condense into a liquid state, but the pressure also decreases and the boiling point changes as well
Pressurized liquefaction. It releases heat, so cooling is required.
So when does phase transformation occur in the liquefaction of gaseous ammonia, before cooling or after cooling?
Pressurized liquefaction, throttling expansion, cooling and separation.
Under pressure, it becomes a high-pressure gas at a relatively high temperature; upon cooling, it turns into a high-pressure liquid at room temperature, with phase change and liquefaction occurring during the cooling process. In a closed system, the concept of boiling point does not apply. By examining the saturated vapor pressure curve, if the temperature and pressure of the substance are above the line, it is in gaseous state; if they are below the line, it is in liquid state
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