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Discussion on the classification and physical characteristics of industrial gas Dec 20, 2017

There are many kinds of gas products. In general, we divide it into two categories, industrial gases and special gases.

Industrial gas: Large production and sales, but the requirement for purity is not high.

Special gas: The production and sales volume is small, but according to different uses. There are very strict requirements for the purity or composition of different special gases, the highest allowable content of harmful impurities, the packaging and storage of products, and so on. They belong to high technology and high added value products.

Special gases can be re-assort, but we will not introduce them here one by one. Next, we will mainly introduce industrial gases, and introduce their classification and characteristics.

Industrial gases are usually classified as the second types of compressed gas and liquefied gas. These chemical substances are gases that are compressed, liquefied or dissolved by pressure. When gas is pressurized or lowered, the distance between gas molecules can be greatly reduced and compressed into a steel cylinder. This gas is called compressed gas (also known as permanent gas, such as oxygen, nitrogen, argon, hydrogen, etc.). Compressed gas continues to pressurize, appropriate cooling, compressed gas will become liquid, which is called liquefied gas (such as liquid chlorine, liquid ammonia, liquid carbon dioxide, etc.). In addition, there is an extremely unstable gas pressure, after dissolved in a solvent stored in the cylinder, the gas is called dissolved gases (such as dissolved acetylene etc.). Industrial mixed gas is a new kind in the past twenty years, with a very wide range of uses, but its classification has not yet had a unified standard. Industrial mixed gas consists of two types: natural synthesis and pure product preparation.

The common physical properties of industrial gases can be summed up as follows: compressibility and expansibility. When a certain amount of gas at a constant temperature, the larger the pressure is, the smaller the volume will be. If we continue to pressurize, the gas will be compressed into liquid, which is the compressibility of gas. Industrial gases are usually stored in a steel cylinder in a state of compression or liquefaction. When the gas is heated or illuminated, the temperature increases, and the thermal movement between molecules increases, the volume increases. If the temperature of the heated gas is higher in a container, the greater the pressure formed after expansion is, that is the expansion of gas heating. Compressed gases and liquefied gases are stored in containers. If in the high temperature or basked in the sunshine, gases will easily expand and produce great pressure. When pressure exceeds the pressure strength of containers, they will cause explosion. Therefore, the industrial gas has a great risk of explosion.