How is carbon dioxide dried?

Dry ice, or solid carbon dioxide, is a dense, snow-like substance that converts directly to vapor without melting at -78.5 ° C (-109.3 ° F), used as a refrigerant, especially when transporting perishable goods such as meat or ice cream.

Dry ice production takes advantage of the rapid cooling that occurs when compressed, liquefied carbon dioxide at -57 ° C (-71 ° F) or below is suddenly brought to atmospheric pressure: the liquid freezes to a fine solid that compresses to 20 kg (45 lbs).