One minute to learn about Supercritical carbon dioxide
Supercritical carbon dioxide refers to the state in which carbon dioxide is in a gas-liquid phase transition at a critical temperature (31.1°C) and critical pressure (7.38MPa). In this state, carbon dioxide has a density similar to that of a liquid state, while having gaseous compressibility. Therefore, supercritical carbon dioxide can be used as a solvent under high temperature and pressure conditions. Compared with traditional organic solvents, supercritical CO<> solutes have a faster diffusion and transfer rate, are easier to remove, and are more environmentally friendly. Therefore, supercritical carbon dioxide is widely used in chemical reactions, material processing, energy conversion and other fields.
In chemical reactions, it can be used as a controllable solvent to improve the selectivity and yield of the reaction. At the same time, supercritical carbon dioxide is also used as an oxidizing agent, reducing agent or transfer hydrogen source, playing a catalytic role in the reaction. In addition, the high diffusion rate and mass transfer efficiency of supercritical carbon dioxide can also facilitate the chemical reaction. In material processing, it can be used as a medium for forming nanoparticles, and nanomaterials with excellent properties can be prepared by microemulsification, emulsification and other methods. At the same time, it can also be used in the preparation of inorganic membranes to control the formation of membranes by taking advantage of changes in solubility.
In the field of energy, it can be used as a mass transfer medium for transferring waste heat and recovering heat, and can also be used for chemical absorption heat pumps, chemical energy storage and other aspects. Supercritical carbon dioxide can be used in food processing to remove additives such as pigments, as well as to extract ingredients such as fish oil and vegetable oil. Because it is effective and environmentally friendly, it does not affect the taste and quality of food, so it is widely used in the food processing industry. In drug preparation, it can be used to prepare particles, solid dispersants, and extract pharmaceutical components. Due to its high solubility and mild reaction conditions, it is a promising drug preparation process and separation process. In short, it is a media with potential and has a wide range of application prospects in many fields. Through continuous research and development, it is expected to play its unique role in more fields.
Supercritical carbon dioxide refers to the state in which the physical properties of carbon dioxide change in high-pressure and high-temperature environments, and the state that occurs is the supercritical state. Supercritical carbon dioxide has a wide range of applications in industry, medical and other fields, but in the process of use, the following matters need to be noted. It has high solubility at high pressure and high temperature, but if the temperature and pressure are not well controlled, it will lead to the explosion of carbon dioxide, resulting in serious safety accidents. Supercritical carbon dioxide has a certain toxicity to the human body, so it is necessary to ensure good ventilation when using it, and carbon dioxide cannot accumulate indoors, otherwise it will pose a threat to human health.
The pressure of supercritical carbon dioxide is very high, so it is necessary to ensure that the equipment has high pressure resistance performance when using, or use qualified supercritical carbon dioxide equipment to ensure operational safety. The use of supercritical CO2 requires unified management and monitoring to avoid equipment failures, operating errors, etc., causing unnecessary injuries and economic losses. Personnel using supercritical CO2 need professional training and safety education to improve operational skills and safety awareness and reduce accidents. In short, the use of supercritical carbon dioxide requires great care, and for users, it is necessary to master its physical characteristics and safe operation methods to ensure its safe use.
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