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Process for separating and recovering minim organic solvent from waste water using ion liquid

A technology of ionic liquids and organic solvents, applied in the field of trace organic solvents, can solve problems such as secondary pollution, time-consuming, and unsatisfactory separation and recovery effects, and achieve reduced loss, good adaptability and operability, and increased compatibility Effect

Inactive Publication Date: 2005-03-16
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the defects of the prior art, such as energy consumption, time consumption, unsatisfactory separation and recovery effect, and easy to cause secondary pollution, etc., and utilize the characteristics of super-solubility, non-volatile and stable chemical properties of the ionic liquid itself, which can The liquid-liquid extraction method is used to separate the organic solvent from the aqueous solution, so that the whole process is fast, efficient, and pollution-free, thereby providing a simple, energy-saving, and good separation and recovery effect. Using ionic liquids to separate and recover trace organic solvents in wastewater. Method

Method used

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  • Process for separating and recovering minim organic solvent from waste water using ion liquid
  • Process for separating and recovering minim organic solvent from waste water using ion liquid
  • Process for separating and recovering minim organic solvent from waste water using ion liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1, hydrophobic ionic liquid [bmim] PF 6 Synthesis

[0034] According to the literature (J.G.Huddlestion, H.D.Willauer, et al.[J].Chem.Commun., 1998, 1765), the ionic liquid was synthesized in two steps by the hydrothermal method, and the bromobutane imidazole compound was first synthesized. Re-distill methylimidazole and bromobutane respectively before the reaction, then mix them in a three-necked flask at a molar ratio of 1:1, heat and reflux in a water bath at a temperature of 70°C for 32 hours, wash with ethyl acetate after cooling 3 to 5 times to remove unreacted methylimidazole and bromobutane, and 70°C rotary evaporation to obtain bromobutane imidazole with a yield of >99.5%. Will KPF 6 After mixing with newly synthesized bromobutylimidazole in a molar ratio of 1.1:1, ion exchange occurs at a water bath temperature of 70°C, and washed with an equal volume of deionized water for 3 to 5 times until the pH is near neutral. The target product was obtaine...

Embodiment 2

[0036] Embodiment 2, the solubility characteristic of pure organic solvent in ionic liquid

[0037] Select five commonly used organic solvents, butyl acetate, acetic acid, ethanol, butanol, and dimethylformamide (DMF), and mix them with hydrophobic ionic liquid [bmim]PF at a volume ratio of 1:1 6 、[omim]PF 6 , [C 12 mim]PF 6 After fully mixing, it was found that no emulsification occurred. Experimental results such as figure 2 as shown, figure 2 It is the state of two-phase delamination after mixing equal volumes of organic solvents and ionic liquids (the mixing effect of the same series of ionic liquids is similar). From this result, it can be seen that butyl acetate, acetic acid and dimethylformamide (DMF) are miscible with ionic liquids , no stratification occurred; only about 30% of ethanol and butanol were dissolved in the ionic liquid. In conclusion, the above organic solvents can be enriched in ionic liquids.

Embodiment 3

[0038] Embodiment 3, use the ionic liquid prepared in embodiment 1 to extract butyl acetate in the aqueous solution

[0039] Under room temperature conditions, preparation concentration (wt%) is the butyl acetate aqueous solution of 0.6,0.4,0.3,0.2, the hydrophobic ionic liquid prepared with embodiment 1 is extractant, with (ionic liquid / butyl acetate aqueous solution ) in a ratio of 1 / 10, fully stirred, and left to stand, the water phase and the ionic liquid phase can be separated rapidly without emulsification.

[0040] The aqueous raffinate was extracted with n-hexane, analyzed by gas chromatography, and the residual organic solvent content of the aqueous raffinate was detected. The extraction rate of the ionic liquid was calculated according to formula (1). The results are listed in Table 1.

[0041]

[0042] Extraction rate (%)

[0043] It can be seen from Table 1 that under the condition of comparing 1:10, the primary extraction efficiency of the ionic liqui...

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Abstract

The invention discloses a process for separating and recovering minim organic solvent from waste water using ion liquid consisting of, mixing hydrophobic ionic liquid with aqueous solution of organic solvent whose concentration is lower than 0.1-10 wt% by the volume ration of 1 : 1-10, fully stirring and depositing for stratification, gathering the organic solvent in the aqueous phase into ionic liquid phase, separating the ionic liquid phase, evaporating the organic solvent in the ionic liquid through decompression, thus achieving the goal of reclaiming organic solvent.

Description

technical field [0001] The invention relates to a method for separating and recovering trace organic solvents in waste water by using ionic liquids. technical background [0002] Organic solvents such as butyl acetate, ethanol, butanol, N,N'-dimethylformamide and acetic acid are widely used in food, pharmaceutical and chemical industry, electronics industry, military production and other fields. Most of the wastewater generated in these industries contains one or more of the above organic solvents. Although the concentration of these organic solvents in wastewater is only a few percent or even a few percent, the amount of industrial wastewater discharged every day is very large. If it is discharged directly without treatment, it will definitely pollute the environmental water body. Bring a large amount of COD (chemical oxygen demand), causing serious environmental pollution. [0003] In order to separate and recover organic solvents from industrial wastewater, the most com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/26
Inventor 李昊余江胡雪生高任龙刘会洲张玉祥王分良姚铮
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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