System and process for recovering ethylene glycol from deicing waste liquid

Abstract

The invention discloses a system and a process for recovering ethylene glycol from deicing waste liquid, and relates to the technical field of wastewater treatment.The system for recovering ethylene glycol from deicing waste liquid is characterized in that the liquid outlet end of a raw material liquid pump is sequentially connected with a first preheater, a second preheater and a separation tower; the separation tower is provided with a first reboiler, the gas outlet end of the separation tower is sequentially connected with a first preheater, a first condenser and a first circulating pump, the liquid outlet end of the first circulating pump is connected with the separation tower and a waste discharge flow channel, the liquid outlet end of the separation tower is connected with the purification tower, and the purification tower is provided with a second reboiler. The gas outlet end of the purification tower is sequentially connected with the second preheater and the first gas-liquid separator, the gas outlet end of the first gas-liquid separator is connected with the second condenser, and the liquid outlet end of the first gas-liquid separator is connected with the purification tower through the second circulating pump, so that high-purity ethylene glycol can be obtained, and the energy consumption and cost of ethylene glycol recovery are reduced. The ethylene glycol recovery process is based on the system, and the recovery power consumption and cost can be low.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a system and a process for recovering ethylene glycol from deicing waste liquid. Background technique [0002] Airport de-icing and anti-icing play a very important role in ensuring the safe flight of aircraft in winter. If a large amount of de-icing fluid is directly discharged without treatment, it will bring many environmental problems. The academic community generally believes that the impact of deicing fluid on the environment is mainly manifested in three aspects: the consumption of dissolved oxygen in the receiving water environment, the toxicity to aquatic organisms, and the harm to the human body. Studies at home and abroad have shown that the direct discharge of deicing wastewater from airports will have adverse effects on people's lives. Ethylene glycol in deicing fluids can cause damage to the kidneys, especially if children ingest a large amount for a lo...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problems of high energy consumption and high cost of recovering ethylene glycol from deicing waste liquid in the existing distillation purification system, the present invention provides a system and process for recovering ethylene glycol from deicing waste liquid, Water and ethylene glycol can be preliminarily separated through the separation tower, and then the ethylene glycol can be purified through the purification tower, and the gas output from the separation tower and the purification tower can be preheated to the deicing waste liquid, not only can obtain the ethylene glycol that meets the industrial standard Glycol, and can reduce the energy consumption and cost of recycling ethylene glycol

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