Separation of liquid air is an industrial method of oxy […]
Separation of liquid air is an industrial method of oxygen production. The boiling point of nitrogen in the air is lower than that of oxygen e799bee5baa6e997aee7ad94e78988e69d8331333431363035. First, the air is pressurized and cooled to a liquid state, and then heated. Since the boiling point of liquid nitrogen (-196 degrees Celsius) is lower than that of oxygen (-183 degrees Celsius), nitrogen It first evaporates from the liquid air, and what remains is liquid oxygen.
The method of separating liquid air is a physical change, the melting boiling point of a substance is a physical property, and the method of separating liquid air is based on the difference of the boiling points of gases.Wholesale Liquid air fresh 1 refill home
Air is a mixed gas composed of multiple components, of which 78.09 is nitrogen; 20.95 is oxygen. It is possible to use isenthalpic expansion or isentropic expansion to continuously remove heat from the air to cool it.
When it drops below the condensation temperature, it takes away the heat to cool it down. When it drops below the condensation temperature, it starts to liquefy, but the condensation temperature of the oxygen component is 90.2K; the condensation temperature of the nitrogen component is 77.3K.
Therefore, when the mixed gas drops to 81.5K, liquid air begins to appear. At this time, the proportion of oxygen in the liquid is high. When the heat is further removed, the nitrogen component in the liquid gradually increases, and the temperature of the liquid gradually decreases. When liquefying, the boiling point of liquid air will be 78.6K.