Chemical formula: CO2

CAS registration number: 124-38-9

Appearance: It is a colorless, odorless or colorless, odorless and slightly sour gas under normal temperature and pressure.

Molecular weight: 44.0095

Purity: 99.999%

Packing: 40L

Gas content: 5.5 cubic

The gas indicates
carbon dioxide, a carbon oxide compound with a chemical formula of CO2 and a chemical formula of 44.0095. It is a colorless, odorless or colorless odorless (smelling taste) and slightly sour gas at normal temperature and pressure. It is also a common greenhouse gas and one of the components of air (0.03%-0.04% of the total volume of the atmosphere). In terms of physical properties, carbon dioxide has a melting point of -78.5 ° C, a boiling point of -56.6 ° C, a density greater than air density (under standard conditions), and is soluble in water. In terms of chemical properties, carbon dioxide is chemically inert, has high thermal stability (only 1.8% decomposition at 2000 ° C), can not be burned, usually does not support combustion, is an acidic oxide, has the permeability of acidic oxides, Since carbonic acid is formed by reaction with water, it is an acid anhydride of carbonic acid. 
Carbon dioxide can generally be obtained by calcining limestone at high temperature or by reacting limestone with dilute hydrochloric acid, mainly for refrigerating perishable foods (solid), as a refrigerant (liquid), for making carbonated soft drinks (gaseous) and as a solvent for homogeneous reaction ( Supercritical state) and so on. Regarding its toxicity, studies have shown that low concentrations of carbon dioxide are not toxic, and high concentrations of carbon dioxide can poison animals.

main application 

High-purity carbon dioxide is mainly used in the electronics industry, medical research and clinical diagnosis, carbon dioxide lasers, calibration gas for testing instruments, and other special mixed gas. It is used as a regulator in polyethylene polymerization. 
Solid carbon dioxide is widely used in chilled dairy products, meat, frozen foods and other foods that are perishable in transport. It is used as a refrigerant in many industrial processes, such as pulverizing heat sensitive materials, rubber polishing, metal cold processing, and shrink fitting of mechanical parts. , vacuum traps, etc. 
Gaseous carbon dioxide for carbonized soft drinks, pH control of water treatment processes, chemical processing, food preservation, inert protection of chemical and food processing processes, welding gases, plant growth stimulators, for hardening molds and cores in casting and for Pneumatic device, also used as a diluent for germicidal gas (that is, a mixture of ethylene oxide and carbon dioxide as a sterilization, insecticide, fumigant, widely used in the sterilization of medical equipment, packaging materials, clothing, fur, bedding, etc. , bone powder disinfection, warehouse, factory, cultural relics, fumigation of books). 
Liquid carbon dioxide is used as a refrigerant, low temperature testing of aircraft, missiles and electronic components, improving oil well recovery, rubber polishing and controlling chemical reactions, and can also be used as a fire extinguishing agent. 
Supercritical carbon dioxide can be used as a solvent for dissolving non-polar, non-ionic and low molecular weight compounds, so it is widely used in homogeneous reactions.