Before air is fractionally distilled,dirt and other solid matter have to be removed.Carbon dioxide and water vapour are then removed.
a) Suggest how dirt and other solid matter are removed.
b) Suggest how
i) Cardon dioxide is removed
ii) water vapour is removed?
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Dirt and solids can be removed by passing the air through a HEPA filter. Carbon dioxide is commonly removed from an air sample one of two ways. You can pass the air across a scrubber in the form of a bed of activated charcoal, or you can bubble the air through a strong base such as potassium hydroxide, sodium hydroxide, or lithium hydroxide. Either of these methods will effectively remove the carbon dioxide. The international space station uses a lithium hydroxide system for this purpose.
Water vapor can be removed by passing the air stream across a dessicant, a material which has a high affinity for water (for example silica), or it can be removed by chilling the air stream and causing the water to condense and freeze onto a chilled surface. The latter method is more common in industrial applications.
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