High-purity carbon dioxide is mainly used in the electronics industry, medical research and clinical diagnostics, carbon dioxide lasers, calibration gases for testing instruments and the preparation of other special mixing gases, and as a moderator in polyethylene polymerization reactions.
Solid carbon dioxide is widely used in the refrigeration of dairy products, meat, frozen food and other food products that are susceptible to spoilage in transit, and as a refrigerant in many industrial processes, such as crushing of heat-sensitive materials, rubber buffing, cold treatment of metals, shrinkage assembly of mechanical parts, vacuum cold traps, etc.
Solid carbon dioxide is widely used in the refrigeration of dairy products, meat, frozen food and other food products that are susceptible to spoilage in transit.
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 processes, 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, insecticidal and fumigant agent, which is widely used for sterilizing medical instruments, packaging materials, clothing, furs, and bedding, sterilizing bone meal, and fumigating warehouses, factories, cultural relics, and books).
Liquid carbon dioxide is used as a cooling agent, low-temperature test for airplanes, missiles and electronic components, to improve the recovery rate of oil wells, to polish rubber and to control chemical reactions, and as a fire extinguishing agent.
Expanded Information:
Methods of carbon dioxide production:
1, fermentation gas recovery method
Production of carbon dioxide gas produced in the fermentation process of ethanol, water washing, decontamination, compression, carbon dioxide gas is produced.
2, by-product gas recovery method
Ammonia, hydrogen, ammonia production process is often decarbonization (i.e., remove carbon dioxide in the gas mixture) process, so that the carbon dioxide in the mixture of gases by the pressurized absorption, decompression and heating desorption of carbon dioxide gas with high purity can be obtained.
3, adsorption expansion method
Generally by-product carbon dioxide as raw material gas, with adsorption expansion method from the adsorption phase to extract high-purity carbon dioxide, with low-temperature pumps to collect the product; can also be used in adsorption distillation method, adsorption distillation method using silica gel, 3A molecular sieve and activated carbon as an adsorbent, to remove some of the impurities, the distillation can be produced after high-purity carbon dioxide products.
4, charcoal kiln method
Carbon dioxide is obtained by refining the gas obtained from the kiln gas of charcoal kiln and methanol cracking.
Baidu Encyclopedia-Carbon Dioxide