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...
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| creator | CAO QINLING FU XINYI TANG QIWEN WANG ZHENGLUO ZHOU WEIJIANG CHEN QIZHANG |
| description | 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 |
| format | Patent |
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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</description><language>chi ; eng</language><subject>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</subject><creationdate>2022</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20220729&DB=EPODOC&CC=CN&NR=114804254A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,309,781,886,25569,76552</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20220729&DB=EPODOC&CC=CN&NR=114804254A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>CAO QINLING</creatorcontrib><creatorcontrib>FU XINYI</creatorcontrib><creatorcontrib>TANG QIWEN</creatorcontrib><creatorcontrib>WANG ZHENGLUO</creatorcontrib><creatorcontrib>ZHOU WEIJIANG</creatorcontrib><creatorcontrib>CHEN QIZHANG</creatorcontrib><title>Method for recovering ethylene glycol in waste liquid</title><description>The invention discloses a method for recovering ethylene glycol in waste liquid. 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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</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | 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 |
| title | Method for recovering ethylene glycol in waste liquid |
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