The invention relates to a method for separating light dydrocarbon
aromatization dry gas, which belongs to the technical field of light dydrocarbon
aromatization. The method is characterized by comprising a reaction liquid separation tank, an
absorption column and an analytical column; reaction gas of the reaction liquid separation tank enters the bottom of the
absorption column to absorb and separate condensable hydrocarbons further; the
material flow at the bottom of the
absorption column returns to the reaction liquid separation tank; gas on the top of the column passes through a primary gas-liquid separation tank, a hydrogenation reactor and a secondary gas-liquid separation tank and then enters a
hydrogen manufacturing device; high-purity
hydrogen is separated out from the top of thehydrogen manufacturing device, and
alkane-rich
dry gas is separated out from the bottom to enter a
pyrolysis device; and a
liquid phase of the reaction liquid separation tank enters the analytical column, and the gas of the top of the analytical column returns to the reaction liquid separation tank. Aiming at the defects in the prior art that the
dry gas is only subjected to simple gas-liquid separation, the quality of the dry gas is poor, and the uncompleted and unreasonable factors exist in the aspect of reasonable utilization of the
aromatization, the invention provides the method for separating the dry gas thoroughly and completely, so that the quality of the dry gas is high, and the components of the dry gas are divided into components containing high-purity
hydrogen and CH4, C2+,C3,C4 and over C4 which do not contain
alkene, and the dry gas is utilized reasonably and effectively and meets the requirement of
peripheral resource environment of enterprises.