Production and storage of dry ice Liquid carbon dioxide will be liquefied at 20℃ and 5.73MPa when stored at normal temperature and high pressure, which will reduce the pressure of liquid carbon dioxide. Some liquid carbon dioxide will evaporate and absorb a lot of heat, and the other part will be cooled into snow-like solid. Compacting snow-like solid carbon dioxide to obtain dry ice. (Or liquid carbon dioxide can be cooled to -2 1. 1℃ and the pressure is 0.4 15MPa, or solid carbon dioxide can be formed. )

The simple method is to put a canvas bag on the mouth of the container containing liquid carbon dioxide, and then open the container to release carbon dioxide, so that some dry ice can be collected in the pocket.

Mass production needs a special dry ice maker.

Dry ice should be stored in high-pressure steel cylinders. If there is no high-pressure steel cylinder, it can be stored in the freezer of the refrigerator for 5 ~ 10 days.