The production of dry ice (solid carbon dioxide) is mainly based on the physical principle of "pressurized liquefaction, depressurized evaporation, endothermic solidification". There are three main methods for producing dry ice:
1. Industrial production method
Industrial dry ice production method: Liquid carbon dioxide (LCO2) is supplied from a low-temperature CO2 storage tank to the ice making chamber of an industrial dry ice maker machine. Most of the liquid CO2 evaporates and absorbs heat to become gas, while the remaining liquid CO2 solidifies into snowflake shaped dry ice. Subsequently, the hydraulic system of the dry ice making machine compresses the dry ice snow into dry ice pellets or dry ice blocks.
2. Commercial production method
Commercial dry ice production method: Using a commercial small dry ice maker machine, connected to a carbon dioxide cylinder, can achieve the production of a small amount of dry ice. It is suitable for bars, hotels, and laboratories with low demand for dry ice.
3. Simple homemade method
Carbon dioxide fire extinguisher production method: Use a liquid carbon dioxide fire extinguisher and a sturdy cloth bag, tightly wrap the cloth bag around the nozzle of the fire extinguisher and fix it, pull out the safety pin, and press the pressure handle to release the gas. When gas is sprayed, white dry ice powder will form near the nozzle, which can be collected in a cloth bag. This method produces very small quantities, and attention should be paid to antifreeze and ventilation.
Safety reminder: Dry ice temperature is extremely low (-78.5 ℃), direct contact with the skin can cause serious frostbite, and thick antifreeze gloves must be worn during operation; Dry ice sublimation produces a large amount of carbon dioxide gas, which can cause oxygen deficiency in enclosed spaces. Ventilation must be maintained during operation and storage.
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