H2 Mainly used in large scale integrated circuit manufacturing. As SiH4 / H2, prepared PH3 / H2, such as B2H6 / H2 mixture sty

H2

Colorless odurless flammable gas. The air of flammable limit 75.0% 4.0% ~ (V). 571.2 spontaneous combustion temperature °C. The relative density ds (0 °C, air = 1) 0.06960. ρ g 0.08342 kg/m3 (212 101.3 °C, kPa); Liquid density 70.96 kg/m3 (252.8 °C, kPa 101.3 -). Boiling point - 252.8 °C. Melting point - 259.2 °C. Hydrogen molecule consists of two isomers composition, with points under normal temperature is still hydrogen proportion is 75:25. As the temperature decreases, rise, along with hydrogen proportion lasalle released into heat. 20.4 K composed 0.2: when 99.8 balance. Hydrogen non-toxic, but cannot sustain life. Hydrogen purification methods mainly has low temperature adsorption, low temperature liquefaction method, metal hydride hydrogen purification method; Besides the diffusion method palladium membrane, hollow fiber membrane diffusion method and variable pressure adsorption method, etc. Hydrogen is the main industrial raw material, is also one of the major future secondary energy. High purity hydrogen is mainly used in large scale integrated circuit manufacturing, provide reducing atmosphere, as SiH4 / H2, prepared PH3 / H2, such as B2H6 / H2 mixture style. In electric vacuum devices and materials for hydrogen production process, demands high purity. The anode and cathode tube metal components, and the grid are required to pass through special burning hydrogen processing. Hydrogen is used for carrier gas chromatography. In petrochemical and coal chemical industry, hydrogen is widely used. Liquid-hydrogen used for rocket fuel and spacecraft propellant, also used in low temperature material performance test and superconducting study.

Hydrogen H2 h2