The Main Uses of CO2 (1）

The main uses of CO2 (1）

Carbon dioxide is an oxide of carbon, with the chemical formula CO2. It is a colorless, odorless or colorless gas, and aqueous solutions have a slight sour taste at room temperature and pressure. It is very common. High purity carbon dioxide is mainly used in the electronics industry and as a regulator for polyethylene polymerization.

Solid carbon dioxide is commonly used to cool dairy products, meat, frozen foods, and other perishable foods during transportation. Gaseous carbon dioxide is used for carbonation of soft drinks, chemical processing, food preservation processes, chemical and food processing inert protection, welding gases, and plant growth stimulants.

Liquid carbon dioxide is used as a refrigerant, for example in low-temperature testing of aircraft, missiles, and electronic components, as well as as as as a fire extinguishing agent. Supercritical carbon dioxide can be used as a solvent for dissolving non-polar, non-ionic, and low molecular compounds.

Used as a chemical solvent. At low temperatures, carbon dioxide easily forms solid dry ice. When the pressure increases to about 10 atmospheres, dry ice will liquefy. Even at room temperature, when the pressure reaches 80 atmospheres, it remains liquid and can be used as a solvent and chemical cleaning agent for gasoline, carbon tetrachloride, ether, etc. It is an excellent solvent for environmental protection and safety.

As a special cleaning agent. The extremely low dry ice temperature can cause special changes in the solidification and contraction of many substances. For example, separating the oil and grease on the surface of dirt and fibers through condensation and contraction, achieving the goal of secondary pollution-free cleaning. It is a new and efficient cleaning method with special application value in many industries such as aerospace, nuclear energy, ships, automobiles, printing, electricity, molds, etc;

Used to create smoke effects on stage. In the past, when smoke effect was needed, it was generated through the evaporation of contaminated aerosols that could easily cause allergies and respiratory infections. Using dry ice to condense water in the air into smoke is completely harmless;

Beauty and medical applications. Solid dry ice can also be used as a material for cryotherapy. Cryotherapy can alleviate inflammation. Mix frozen anti acne materials with ground dry ice and ethyl ketone, sometimes with a little sulfur added. This cryotherapy can reduce acne scars, but it cannot be used to remove scars;

Used as an expansion agent. In some production processes, such as the manufacturing of foamed plastics, the material needs to expand and evaporate under a certain temperature and pressure to form a uniform hollow honeycomb structure. Another function of expansion agents is similar to the "ironing" effect of water vapor, which can be used in the tobacco manufacturing process under low-temperature and anhydrous conditions. According to the gas expansion process, it can be "smoothed". Tobacco. At low temperature and atmospheric pressure, carbon dioxide can be a solid powder. It can be used as an expanding agent within a certain temperature range, and will vaporize and expand with increasing temperature. Compared with other foaming agents, it has advantages such as flame retardancy, environmental protection, and low cost.

Used as welding shielding gas. The welding process is usually a high-temperature process, and many high-temperature metals will react with oxygen in the air to produce metal oxides, seriously affecting the quality of the weld and even not welding. Carbon dioxide, nitrogen, argon, and other gases are used to protect the surface of the weld and isolate oxygen. The inertness of these gases makes them less likely to react with metals, which can prevent the formation of oxides. CO2 is used in some metal welding processes, with good protective performance, low cost, and environmental safety.

Used in the chemical industry. Carbon dioxide is also commonly used in organic and inorganic chemicals, such as sugars, fertilizers, and plastics. With further research on its application in the chemical industry, more applications will be discovered.

The process of underground mineral extraction involves recharging the medium. For example, in oil production, water and carbon dioxide can be injected into oil wells to maximize oil resource production and extend production life. Carbon dioxide injection is more effective than water injection, but it is relatively expensive, especially in low oil prices. Its application is not widespread, but it is also a relatively safe and high-capacity storage method.