Process for recovering benzene in tail gas desorption water in chlorobenzene production

The invention discloses a process for recovering benzene in chlorobenzene production tail gas desorbed water, and relates to the technical field of benzene recovery, and the process comprises the following steps: adding benzene, chlorine and iron powder into a reaction kettle according to parts by weight, and condensing the generated tail gas I for multiple times, so that part of benzene in the tail gas I is liquefied and recovered to form tail gas II; the second tail gas is introduced into a horizontally-placed annular resin channel to circularly flow, then resin in the resin channel is taken out and soaked in constant-temperature distilled water for standing, meanwhile, generated gas is discharged into condensing equipment to be condensed, and a desorption solution is obtained; the desorption solution is introduced into a separation tank for preliminary separation, three layers of separation solutions are obtained, the uppermost layer is benzene-containing suspension, the middle layer is desorption water, a