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| Study on extraction recovery of DMF in wastewater using high-boiling point solvent |
| WANG Yaqi1,2,3,ZHOU Zhimao1 |
| 1. Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China; 2. University of Chinese Academy of Sciences, Beijing 100049,China; 3. NCPC Hebei Huamin Pharmaceutical Corporation Ltd., Shijiazhuang 052165,China |
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Abstract The extraction recovery technology of low consistency N-N dimethyl formamide (DMF) in wastewater using low- boiling point solvent had some problems, such as high solvent losses, serious VOC pollution, ect.. A novel extraction method of DMF in wastewater with high-boiling point solvent (octanol, iosoctanol, heptanol, 2-octanediol) was explored. The effects of temperature, ratio of phase and inorganic salts on partition coefficient and extraction coefficiency were investigated. A good extraction performance was achieved with octyl alcohol-water-DMF as extraction agent.The results show that the extraction efficiency can reach 64% by singlestage extraction at 60 ℃, 2 of O/W, 20% (wt%) of CaCl2 amount. Further more, the content of DMF in raffinate phase reaches 0.05% by three-steps extraction, that can meet the requirement of wastewater discharge.
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