1, high-purity carbon dioxide is mainly used in the electronics industry, carbon dioxide lasers, testing instruments, and preparation of other special calibration gas mixing table gas, in the polyethylene polymerization reaction is used as a regulator.

2, solid carbon dioxide is widely used in cold storage of dairy products, meat, frozen food and other transit in the easily corruptible food, in many industrial processes as a refrigerant, such as crushing of heat-sensitive materials, rubber polishing, cold treatment of metals, shrinkage of mechanical parts assembly, vacuum cold traps and so on.

3. Gaseous carbon dioxide is used for carbonation of soft drinks, pH control in water treatment processes, chemical processing, food preservation, inert protection in chemical and food processing, welding gas, plant growth stimulant, in casting for hardening molds and cores and for pneumatic devices.

It is also used as a diluent for sterilizing gas (i.e., the mixed table gas of ethylene oxide and carbon dioxide is used as a sterilizing, pesticide, and fumigant, and is widely used in the fumigation of medical appliances, packaging materials, clothing, furs, factories, cultural relics, and books).

4, liquid carbon dioxide used as a refrigerant, aircraft, missiles and electronic components of the low temperature test, improve oil recovery, rubber polishing and control of chemical reactions, can also be used as a fire extinguishing agent.?

5, supercritical state of carbon dioxide can be used as a solvent to dissolve non-polar, non-ionic and low molecular weight compounds, so there is a wide range of applications in the homogeneous reaction.

Expanded Information

Carbon dioxide gas, a part of the composition of the atmosphere (accounting for 0.03%-0.04% of the total volume of the atmosphere), is abundant in nature, and there are several ways to produce it:

1) Organic matter (including plants and animals) in the process of decomposition, fermentation, putrefaction, and deterioration can be Carbon dioxide is released in the process of decomposition, fermentation, decay and deterioration.

②Petroleum, paraffin, coal, natural gas combustion process, but also to release carbon dioxide.

③Petroleum and coal also release carbon dioxide during the production of chemical products.

④ All manure, humic acid in the process of fermentation, ripening can also release carbon dioxide.

⑤ All animals take in oxygen and exhale carbon dioxide during respiration.?

Baidu Encyclopedia-Carbon Dioxide