What are the different types of industrial gases? Industrial control gases are usually classified as Class 2 compressed gases and liquefied gases in the classification and labeling of some dangerous chemicals commonly used in national safety standards. This class of information chemicals refers to gases that can be dissolved by compression, liquefaction or pressure.

First, the types of industrial gases

1, compressed gas After the gas is compressed or reduced in temperature, the distance between gas molecules can be greatly reduced and compressed into the cylinder. This gas is called compressed gas, such as oxygen, nitrogen, argon, hydrogen, etc.

2, if the compressed gas is kept pressurized by the liquefied gas and properly cooled, the compressed gas will become a liquid, which is called liquefied gas, such as liquid chlorine, liquid ammonia and liquid carbon dioxide.

3, high pressure dissolved gas In addition, there is an unstable gas, should be dissolved in a solvent, pressurized after storage in the cylinder. This gas is called high pressure soluble gas, such as dissolved acetylene, etc.

Second, the use of different types of industrial gases

1, general enterprise industrial gas, generally through industrial gas as the main content including oxygen, nitrogen, argon and other air separation gases and acetylene, carbon dioxide and other synthesis of a gas, but generally the purity of the gas can be required level is not high, the main technology is used in China metallurgy, petrochemical, coal chemical industry, steel, shipbuilding, heavy industry and other fields. The general development of industry and gas refers to oxygen, nitrogen, argon, neon, helium, krypton, xenon, hydrogen, carbon dioxide, acetylene, natural gas and so on.

2, special gas refers to pure gas, high purity gas, high purity or high purity or high purity gas multiple mixture. Special gases are widely used in electronics, power, petrochemical, mining, steel, non-ferrous metal smelting, thermal engineering, biochemistry, environmental monitoring, medical research and diagnosis, food preservation and other fields. There are more special gases, mainly including high-purity gases and mixed gases, which can usually be divided into electronic gases, standard gases, environmental protection gases, welding gases, sterilization gases, etc.

3, standard gas Standard gas is the standard material. Reference material is a highly uniform, stable and accurate measurement standard, which has the basic role of copying, preserving and transmitting value.

4, welding environmental protection work gas, gas protection welding because the enterprise has the advantages of good quality of Chinese welding technology, high efficiency, easy to achieve system automation and so on, and can be more rapid economic development. Welding can protect and the gas can be a unit gas, there are also binary, ternary mixture. Ternary mixtures include helium, argon and carbon dioxide. Depending on the welding material in the application, students choose their own welding mixture with different proportions.

5, etching gas etching is the silicon oxide film, metal film and other processing surfaces etched away. On the substrate that is not masked by the photoresist, the area covered by the photoresist is retained to obtain the desired imaging pattern on the substrate surface.

6. Fumigation gas The gas with bactericidal effect is called fumigation gas. The principle of sterilization is to use alanine inert to maintain the indispensable life in microbial tissue. Commonly used is a mixture of epoxide ethane and carbon dioxide prepared in different proportions, according to the content of ethylene oxide can be 10%, 20%, 20%, 30% and so on.

7, non-liquefied gas compression process gas as based on a certain social pressure and temperature in the cylinder of the physical learning state and boiling point of different ranges we can be divided into the following two categories, namely liquefied gas and non-liquefied gas.

8, liquefied gas Liquefied gas is a medium with a critical temperature above -50 ° C gas. It is also a general term for high pressure and low pressure liquefied gas. The gas whose critical temperature is higher than -50℃ and lower than or equal to 65℃ is a high-pressure liquefied gas, and the gas whose critical temperature is higher than 65℃ is a low-pressure liquefied gas.

Third, industrial gas applications

As an important basic raw material of modern industry, industrial gas has a wide range of uses. Widely used in metallurgy, steel, petroleum, chemical industry, machinery, electronics, glass, ceramics, building materials, construction, food processing, medical and other sectors.

1, metal welding: metal welding cutting and various combustion devices of the combustion gas environment and for some production process design process oxidation gas.

2, machinery industry: metal welding and cutting can greatly improve work efficiency.

3, chemical industry: manufacturing drugs, dyes and explosives and other chemical products, in addition to increase production (such as blowing oxygen to produce yellow phosphorus and oxygen to produce degraded coal).

4, electronics industry: in addition to being used as a combustion gas, it is also used as an oxidation gas for manufacturing semiconductor integrated circuits. High purity oxygen is also an important source of air for the manufacture of optical fibers.

5. Defense has many uses: Rockets are widely used.