When the temperature reaches minus 20 degrees Celsius and the pressure is 1255.73MPA, carbon dioxide will directly become liquid. When the temperature reaches MINUS 45 degrees and the pressure reaches 3586.88MPA, liquid carbon dioxide will be partially evaporated, and after absorbing a lot of heat, the remaining carbon dioxide will be cooled into snow-like dry ice.

The specific production method is as follows: firstly, the gaseous carbon dioxide is liquefied; Liquid carbon dioxide is led out from a liquid carbon dioxide tank and sprayed into a dry ice compression ice chamber; A large number of gaseous carbon dioxide and snowflake dry ice solids are produced by nozzle throttling.

When the dry ice accumulates to a certain amount, the hydraulic system starts, and the piston presses the snow-like dry ice into dry ice and squeezes it out of the mold. By starting the rotary blade at the end of dry ice, long dry icicles can be cut into dry ice particles.

Dry ice use

Dry ice has been widely used in the preservation of aviation food.

Dry ice is added when making ice cream, so the ice cream doesn't melt easily. Dry ice is especially suitable for cold storage of takeaway ice cream.

Seafood dishes made by star-rated hotels and restaurants, with dry ice, can produce white smoke landscape and improve the banquet level, such as making lobster sashimi.

Lobster, crab, shark's fin and other seafood are frozen and refrigerated. Dry ice will not change water, and it is cleaner than water-cooled storage. Widely used in Europe, America, Japan and other countries.

In the biological laboratory, it is easier, safer and more convenient to transport living cell specimens with dry ice than with liquid nitrogen tanks. It has been adopted by quite a few universities (mainly life sciences) and research institutes in the world.

In the preparation of nano-powder, dry ice is added with ethane to prepare a low-temperature cooling liquid below -70℃, which provides the necessary low-temperature environment for the production of nano-materials.

Dry ice is often used as a cold source in the cold assembly process of mechanical parts. But also more operable than using liquid nitrogen as cold source.

When planting flowers and vegetables in greenhouses, carbon dioxide fertilizer can be applied, and dry ice can be applied regularly and quantitatively.

Dry ice is used to create the cloud effect of stage and film, and is widely used in literary and art circles.

Reference to the above content: Baidu Encyclopedia-Dry Ice