Many people are unaware of the uses of liquid carbon dioxide. Let's delve into a detailed explanation. Now, let's take a look!

Carbon dioxide is a carbon oxide compound. Typically, it can be prepared by calcining limestone at high temperatures or by the reaction of limestone with dilute hydrochloric acid. It is mainly used for refrigeration of perishable foods (solid), as a refrigerant (liquid), in the production of carbonated soft drinks (gas), and as a solvent for homogeneous reactions (supercritical state).

2. High-purity carbon dioxide is primarily used in the electronics industry, medical research, and clinical diagnostics, as calibration gas for carbon dioxide lasers and detection instruments, and in the preparation of other specialized mixed gases. It serves as a regulator in polyethylene polymerization.

3. Solid carbon dioxide is widely used in the refrigerated transportation of dairy products, meats, frozen foods, and other perishable goods. It serves as a refrigerant in many industrial processes, such as粉碎 heat-sensitive materials, rubber polishing, metal cold treatment, shrink fitting of mechanical parts, and vacuum trap cooling.

4. Gaseous carbon dioxide is used for carbonating soft drinks, pH control in water treatment processes, chemical processing, food preservation, inert protection in chemical and food processing, welding gases, plant growth stimulants, for hardening molds and cores in casting, and in pneumatic devices. It is also employed as a gas diluent (i.e., a mixture of ethylene oxide and carbon dioxide used as an agent, insecticide, and fumigant, widely utilized in packaging materials, clothing, furs, and bedding, etc.).

5. Liquid carbon dioxide is used as a refrigerant, for low-temperature testing of aircraft, missiles, and electronic components, to enhance oil recovery, polish rubber, control chemical reactions, and also as an extinguishing agent.

6. Supercritical carbon dioxide can dissolve non-polar, non-ionic, and low-molecular-weight compounds as a solvent, thus finding extensive application in homogeneous reactions.

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