Toxicity of carbon dioxide: low concentration of carbon dioxide is not toxic, high concentration of carbon dioxide will cause animal poisoning.
Carbon dioxide can be produced by calcining limestone at high temperature or by the reaction between limestone and dilute hydrochloric acid, and it is mainly used to refrigerate perishable food (solid), as a refrigerant (liquid), to make carbonated soft drinks (gaseous), and as a solvent for homogeneous reaction (supercritical state), and so on.
Carbon dioxide (carbon dioxide), a carbon-oxygen compound with the chemical formula CO2 and the chemical formula quantity of 44.0095?[1]? At room temperature and pressure, it is a colorless, odorless or colorless, odorless and slightly acidic gas, a common greenhouse gas, or one of the components of the air (about 0.03% of the total volume of the atmosphere).
In terms of physical properties, the melting point of carbon dioxide is -78.5 ℃, the boiling point is -56.6 ℃, the density is greater than the density of air (under standard conditions), slightly soluble in water.
In terms of chemical properties, carbon dioxide is chemically inactive, highly thermally stable (only 1.8% decomposition at 2000°C), cannot be burned, and usually does not support combustion, and belongs to the acidic oxides, with the acidic oxides in general, because of the reaction with water to produce carbonic acid, so it is the anhydride of carbonic acid.
Expanded Information:
Applications of Carbon Dioxide:
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 preparation of other special mixing gas, in polyethylene polymerization reaction is used as a regulator.
Solid carbon dioxide is widely used in the refrigeration of dairy products, meat, frozen food and other foods that are easily corrupted 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 and so on.
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 aircraft, missiles and electronic components, to improve the recovery rate of oil wells, rubber buffing and control of chemical reactions, and can also be used as a fire extinguishing agent.
Supercritical carbon dioxide can be used as a solvent to dissolve non-polar, non-ionic and low molecular weight compounds, so it is widely used in homogeneous reactions.
Baidu Encyclopedia - Carbon Dioxide