High purity hydrogen

　　High purity hydrogen:

　　Product Name: high purity hydrogen high, purity, hydrogen

　　Molecular formula: H2

　　Product purity: 99.999%

　　Properties: colorless and odorless flammable gas. The flammable limit in air is 4% to 75% (V). The autoignition temperature is 571.2 degrees centigrade. The relative density is DS (0 DEG C, air =1) 0.06960. P g 0.08342kg/m3 (at 21.1 101.3kPa); liquid density of 70.96kg/m3 (-252.8 C, 101.3kPa). Boiling point -252.8 DEG C. Melting point -259.2 DEG C. The hydrogen molecule is composed of two isomers, and the positive hydrogen ratio is 75:25 at normal temperature. With the decrease of temperature, the ratio of secondary hydrogen increases, accompanied by the release of heat of transformation. When 20.4K, the equilibrium composition is 0.2:99.8. Hydrogen is non-toxic, but it can not sustain life. Hydrogen purification methods are mainly low temperature adsorption method, low temperature liquefaction method, metal hydride hydrogen purification method. In addition, there are palladium membrane diffusion method, hollow fiber membrane diffusion method and pressure swing adsorption method, etc.. Hydrogen is the main industrial raw material, and it is also one of the two major energy sources in the future. Gao Chunqing is mainly used in the manufacture of large-scale integrated circuits, providing a restore atmosphere, as a mixture of SiH4/H2, PH3/H2, B2H6/H2 and other gas mixture. In the production of electric vacuum materials and devices, the purity of hydrogen is also very high. The anode, cathode, gate and other metal devices of an electron tube need to be specially treated with hydrogen. Hydrogen is also used as a chromatographic carrier gas. Hydrogen has a wide range of applications in petrochemical and coal chemical industry. Liquid hydrogen as rocket fuel and spacecraft propellant, is also used for material testing and performance of low temperature superconductivity research.