Hydrogen is the main industrial raw material, but also an important industrial gas and special gas, in the petrochemical industry, electronics industry, metallurgy industry, food processing, float glass, fine organic synthesis, aerospace and other fields have a wide range of applications. The company adopts pressure swing adsorption (PSA) method to purify hydrogen from the exhaust gas of PDH unit, which meets the technical requirements stipulated in GB/T 3634.1-2006 "Hydrogen Part 1: Industrial Hydrogen", and the purity reaches 99.999%.