Patent ID: 8778061

Claim:
A hydrogen gas recovery system comprising: a condensation separation unit, which condenses and separates chlorosilanes from a hydrogen-comprising reaction exhaust gas discharged from a polycrystalline silicon production apparatus; a compression unit, which compresses hydrogen-comprising reaction exhaust gas discharged from the condensation separation unit; an absorption unit, which absorbs and separates hydrogen chloride by contacting the hydrogen-comprising reaction exhaust gas discharged from the compression unit with an absorption liquid; and an adsorption unit comprising a plurality of activated carbon-packed columns, which adsorptively remove methane, hydrogen chloride, and chlorosilanes from the hydrogen-comprising reaction exhaust gas discharged from the absorption unit; wherein each of the activated carbon-packed columns has a first line used as a discharge line, which discharges a hydrogen gas as a carrier that regenerates activated carbon in an activated carbon-packed column outside the system and a second line that circulates the hydrogen gas once discharged from the adsorption unit into the adsorption unit; and each column is configured such that the hydrogen gas can selectively be sent to any of the first and second lines, and the second line has a condensation separation part for chlorosilanes, a gas compression part and an absorption separation part for hydrogen chloride in this order.