Method for recovering ethylene glycol in waste liquid

The invention discloses a method for recovering ethylene glycol in waste liquid. The method comprises the following steps: first evaporation recovery: preheating, primary evaporation and ethylene glycol evaporation; and secondary evaporation and recovery: caching, and scraping a film for evaporation...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	CAO QINLING, FU XINYI, TANG QIWEN, WANG ZHENGLUO, ZHOU WEIJIANG, CHEN QIZHANG
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS METALLURGY ORGANIC CHEMISTRY PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:	The invention discloses a method for recovering ethylene glycol in waste liquid. The method comprises the following steps: first evaporation recovery: preheating, primary evaporation and ethylene glycol evaporation; and secondary evaporation and recovery: caching, and scraping a film for evaporation. According to the method, the waste liquid is treated in two stages, in the first stage, liquid with the boiling point lower than 195 DEG C is rapidly removed, including water, glycolaldehyde, glyoxal and glycolaldehyde, and in the second stage, ethylene glycol is further separated and purified; after the ethylene glycol is completely recovered, remaining solids are salts containing noble metal particles; the separation method is high in efficiency, the purity of the recycled ethylene glycol is high, and meanwhile green recycling of precious metal can be achieved; according to the method, low-pressure evaporation is adopted, high-temperature oxidation of ethylene glycol is prevented, the stock solution can be rapi