High purity hydrogen

Chemical terminology

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High Purity Gases is a gas industry term, which usually refers to a certain level of purity that can be achieved by modern purification technology.

Chinese name: High purity hydrogen
Foreign name: high purity hydrogen

Molecular formula: H2
Purity: 99.999%

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physical property

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high purity hydrogen

Molecular formula: H2

For different types of gas, the purity index is different, for example, for nitrogen ， hydrogen ， argon ， helium In general, it refers to the high-purity gas whose purity is equal to or higher than 99.999%; For oxygen The purity of 99.999% can be called high purity oxygen; about hydrocarbon The purity of 99.999% can be regarded as high purity gas.

High purity hydrogen is colorless, odorless and combustible Gas 。 In air Flammability limit 4.0%～75.0%(V)。 Autoignition temperature 571.2℃。 relative density Ds (0 ℃, air=1) 0.06960. ρg 0.08342kg/m3(21.1℃，101.3kPa)； Liquid density 70.96kg/m3(-252.8℃，101.3kPa)。 boiling point -252.8℃。 melting point -259.2℃。 hydrogen There are two kinds of molecules Isomer Composition, normal temperature hydrogen The ratio is 75:25. As the temperature decreases, Secondary hydrogen The proportion increases, accompanied by release Heat of transformation 。 The balance composition at 20.4K is 0.2:99.8. hydrogen Non toxic, but not life sustaining.

Purification method

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hydrogen purification The main methods are Low temperature adsorption method ， Low temperature liquefaction method ， Metal hydride hydrogen purification method ； Besides Palladium membrane diffusion method ， Hollow fiber membrane diffusion method and PSA Etc. Hydrogen is the main Industrial raw materials , which is also the main future Secondary energy one of.

application

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hydrogen It is the main industrial raw material, and also the most important industrial gas and special gas. It is widely used in petrochemical industry, electronic industry, metallurgical industry, food processing, float glass, fine organic synthesis, aerospace and other fields. At the same time, hydrogen is also an ideal secondary energy (secondary energy refers to the energy that must be produced from a primary energy such as solar energy, coal, etc.). In general, hydrogen is easily combined with oxygen. This characteristic makes it a natural reducing agent used in production to prevent oxidation. In the high temperature processing of glass manufacturing and the manufacturing of electronic microchips, hydrogen is added into nitrogen shielding gas to remove residual oxygen. In the petrochemical industry, crude oil needs to be refined by hydrodesulfurization and hydrocracking. Another important use of hydrogen is the hydrogenation of fats in margarine, edible oil, shampoo, lubricant, household cleaner and other products. Due to the high fuel property of hydrogen, the aerospace industry uses liquid hydrogen as fuel.^[1]

purpose

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Nuclear research, bombardment particles of deuteron accelerator, tracers can be used as raw materials for gas chromatography hydrogen flame analysis.

Application industry

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Petroleum refining Float glass Electronics, food, chemical production, aerospace, automobile industry.

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