Method for recovering ethylene glycol in polyester production process

The invention belongs to the technical field of ethylene glycol recovery, and particularly relates to a method for recovering ethylene glycol in a polyester production process, which comprises the following steps: (1) esterified steam is conveyed to a steam generator set, the steam generator set builds and keeps a vacuum degree through a water ring vacuum pump, and part of esterified steam enters the water ring vacuum pump to obtain secondary esterified water; secondary esterified water and gas enter the gas-liquid separation tank, one part of the secondary esterified water in the gas-liquid separation tank returns to the water ring vacuum pump through the circulating pipe and replenishes water to the water ring vacuum pump through the circulating pipe, and the other part of the secondary esterified water in the gas-liquid separation tank is heated and then enters the stripping tower for stripping; steam containing 2-MD and offline esterified water are obtained; and (2) condensing the steam containing 2-MD, f