CN103588675B - Method for extracting butanone oxime from solution by utilizing ionic liquid [BMIM]PF6 - Google Patents
Method for extracting butanone oxime from solution by utilizing ionic liquid [BMIM]PF6 Download PDFInfo
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Abstract
A disclosed method for extracting butanone oxime from solution by utilizing ionic liquid [BMIM]PF6 comprises the following steps: (1) mixing ionic liquid [BMIM]PF6 and ammonium sulfate solution containing butanone oxime according to a volume ratio of 1:1-1:5, extracting with a temperature of 30-40 DEG C for 20-40 min, after extracting, standing and layering into an upper layer being water phase and a lower layer being ionic liquid phase, wherein butanone oxime is gathered into the ionic liquid phase; and (2) distilling out butanone oxime from the ionic liquid phase by employing reduced pressure distillation, and performing cycle utilization on the ionic liquid [BMIM]PF6. According to the method, the ionic liquid [BMIM]PF6 which is difficult to evaporate, easy to recover and stable in properties is taken as extraction agent, so that the disadvantages of conventional organic solvent extraction methods are made up, and the method has the advantages of simple operation, rapid extraction and the like.
Description
Technical field
The present invention relates to liquid-liquid extraction field and solvent recuperation field, particularly relate to one and utilize ionic liquid [BMIM] PF
6the method of Diacetylmonoxime in extraction ammoniumsulphate soln.
Technical background
2-butanone oxime, has another name called methyl ethyl ketoxime (hereinafter referred to as Diacetylmonoxime), is widely used in multiple industry, have good market outlook.Its main application has: (1) is due to its low toxicity, low stain and be used in the anti skinning agent of coating, ink, paint; (2) for polyurethane closed agent; (3) for boiler deoxidant, there is the advantages such as low toxicity, efficient, speed is fast and there is passivation protection effect; (4) as the raw material of organic synthesis intermediate as silicon rubber solidifying agent.
Current production Diacetylmonoxime has multiple method, mainly can be divided into: ketoamine method, catalytic ammoxidation method, nitro moiety hydrogenation method, electrochemical reducing, oxime exchange process, hydrazine hydrate method etc., wherein ketoamine method is one of domestic main method for the production of Diacetylmonoxime.The aqueous solution of oxammonium sulfate or oxammonium hydrochloride adds in reactor by this method together with butanone, pass into ammonia after hybrid reaction certain hour or add ammonia neutralization, then in same reactor, standing separation obtains the ammonium sulfate solution of cymogene ketoxime and by-product, and cymogene ketoxime is by obtaining qualified product after rectifying separation.And containing Diacetylmonoxime in the ammonium sulfate solution of by-product, content is approximately 1000-10000ppm, not only reduces product yield, and has certain organic emission in ammonium sulfate crystallization process, cause environmental pollution, be also unfavorable for the recycled of post-crystallization processes waste water.So need to select suitable extraction agent and abstraction technique to extract the Diacetylmonoxime in ammoniumsulphate soln.
At present, in industrial practice, the traditional organic extractant of general employing extracts the Diacetylmonoxime in ammoniumsulphate soln as benzene, chloroform, butanone etc.Although have certain effect of extracting, traditional extraction agent is organic solvent substantially, and volatility large (easily causing the loss of extraction agent), strong toxicity, environmental pollution seriously, add operational risk and production cost.Ammoniumsulphate soln simultaneously after extraction has dissolved partial extraction agent, and the methods such as water vapor stripping need be adopted to recycle, and to reduce extraction agent loss, improve the quality of producing ammonium sulfate byproduct, make processing wastewater energy recycled, this also makes production technique more complicated.Therefore, for the extraction of Diacetylmonoxime in ammonium sulfate solution, Developing Green, safety, the efficiently research of Novel Extractant are significant.
It is liquid material under the room temperature that ionic liquid is made up of organic cation and inorganic anion, it is as a kind of novel " green solvent " that can be used for alternative volatile organic solvent, there is the advantage that a series of conventional organic solvents is incomparable, as good thermostability and chemical stability, difficult volatilization, extremely low vapour pressure, stronger dissolving power and wider liquid state range, designability with can be recycled, be widely used in the every field such as catalysis, electrochemistry, organic synthesis and extracting and separating.At present, at ionic liquid [BMIM] PF
6correlative study and application is had for extracting and separating aspect, but specific to by ionic liquid [BMIM] PF
6have not been reported for the extraction of Diacetylmonoxime in the ammoniumsulphate soln of by-product in Diacetylmonoxime production process.
Summary of the invention
The object of the invention is to overcome the extraction agent volatile (causing loss of extractant) existing for existing organic solvent extractionprocess, strong toxicity, environmental pollution serious and be partially soluble in aqueous phase and cause the deficiencies such as secondary pollution, provide one to utilize ionic liquid [BMIM] PF
6the method of Diacetylmonoxime in extraction ammoniumsulphate soln.
Utilize ionic liquid [BMIM] PF
6the method of the Diacetylmonoxime in extraction ammoniumsulphate soln comprises the steps:
(1) ionic liquid is extracted with mixing by 1:1-1:5 volume ratio containing the ammoniumsulphate soln of Diacetylmonoxime, extraction temperature is 30-40 DEG C, extraction time is 20-40min, extract rear stratification, upper strata is aqueous phase, lower floor is ionic liquid phase, Diacetylmonoxime be enriched to from aqueous phase ionic liquid mutually in;
(2) by the method for underpressure distillation steam ionic liquid mutually in Diacetylmonoxime, the ionic liquid recycle obtained, ionic liquid is 1-butyl-3-Methylimidazole hexafluorophosphate.
Described is 1000-10000ppm containing the Diacetylmonoxime content in the ammoniumsulphate soln of Diacetylmonoxime, and ammonium sulfate concentrations is 0-40wt%.
Compared with existing conventional organic solvents extracting process, innovative point of the present invention is to utilize and is easier to synthesis, better heat stability, water-soluble less ionic liquid [BMIM] PF
6diacetylmonoxime in extraction ammoniumsulphate soln, have simple to operate, extraction rapidly, high, the ionic liquid of percentage extraction is easy to the advantages such as recycling.
Embodiment
Utilize ionic liquid [BMIM] PF
6the method of the Diacetylmonoxime in extraction ammoniumsulphate soln comprises the steps:
(1) ionic liquid is extracted with mixing by 1:1-1:5 volume ratio containing the ammoniumsulphate soln of Diacetylmonoxime, extraction temperature is 30-40 DEG C, extraction time is 20-40min, extract rear stratification, upper strata is aqueous phase, lower floor is ionic liquid phase, Diacetylmonoxime be enriched to from aqueous phase ionic liquid mutually in;
(2) by the method for underpressure distillation steam ionic liquid mutually in Diacetylmonoxime, the ionic liquid recycle obtained, ionic liquid is 1-butyl-3-Methylimidazole hexafluorophosphate.
Described is 1000-10000ppm containing the Diacetylmonoxime content in the ammoniumsulphate soln of Diacetylmonoxime, and ammonium sulfate concentrations is 0-40wt%.
By ionic liquid [BMIM] PF in operating process of the present invention
6extract with the ammonium sulfate solution mixing containing Diacetylmonoxime, extracted rear stratification, after two-phase interface is clear, got upper water facies analysis Diacetylmonoxime concentration wherein.By Diacetylmonoxime concentration in water by Spectrophotometry, principle is that Diacetylmonoxime is hydrolyzed the azanol of generation and formaldehyde and reacts under the condition adding ammonium persulphate and generate formyl hydroxamic acid in acidic medium, formyl hydroxamic acid can generate red complex with ferric ion, can obtain the concentration of Diacetylmonoxime in water in maximum absorption wavelength 500nm place spectrophotometer measurement absorbancy.And then according to two-phase mixture product value before and after the mass balance of total system Diacetylmonoxime and extraction, the concentration of Diacetylmonoxime in ionic liquid can be calculated.
The present invention's following examples are described further, but are not limited to following examples, and in the scope not departing from the described aim in front and back, change is included in technical scope of the present invention.
Embodiment 1
Get Diacetylmonoxime concentration is 5g/L (5000ppm), ammonium sulfate concentrations is 0wt% the aqueous solution and ionic liquid [BMIM] PF
6both are joined in graduated centrifuge tube with the ratio of 1:1 by each 2ml respectively, then put into constant temperature oscillation in water-bath vibration shaking table, oscillation frequency 200Hz, and temperature controls at about 30 DEG C, opens vibration, two-phase is fully mixed.Stop oscillation after vibration 20min, stratification, upper strata is aqueous phase, lower floor is ionic liquid phase, record two-phase volume.Get 1ml aqueous phase, dilute the concentration with spectrophotometric analysis wherein contained Diacetylmonoxime after 100 times with deionized water.And then according to two-phase mixture product value before and after the mass balance of total system Diacetylmonoxime and extraction, the concentration of Diacetylmonoxime in ionic liquid can be calculated.Can calculate distribution ratio (ionic liquid phase Diacetylmonoxime concentration/aqueous phase Diacetylmonoxime concentration) is thus 1.95, and percentage extraction is 66.11%.
Embodiment 2
Get Diacetylmonoxime concentration is 5g/L (5000ppm), ammonium sulfate concentrations is 20wt% the aqueous solution and ionic liquid [BMIM] PF
6both are joined in graduated centrifuge tube with the ratio of 1:1 by each 2ml respectively, then put into constant temperature oscillation in water-bath vibration shaking table, oscillation frequency 200Hz, and temperature controls at about 30 DEG C, opens vibration, two-phase is fully mixed.Stop oscillation after vibration 20min, stratification, upper strata is aqueous phase, lower floor is ionic liquid phase, record two-phase volume.Get 1ml aqueous phase, dilute the concentration with spectrophotometric analysis wherein contained Diacetylmonoxime after 100 times with deionized water.And then according to two-phase mixture product value before and after the mass balance of total system Diacetylmonoxime and extraction, the concentration of Diacetylmonoxime in ionic liquid can be calculated.Can calculate distribution ratio is thus 3.83, and percentage extraction is 79.29%.
Embodiment 3
Get Diacetylmonoxime concentration is 5g/L (5000ppm), ammonium sulfate concentrations is 40wt% the aqueous solution and ionic liquid [BMIM] PF
6both are joined in graduated centrifuge tube with the ratio of 1:1 by each 2ml respectively, then put into constant temperature oscillation in water-bath vibration shaking table, oscillation frequency 200Hz, and temperature controls at about 30 DEG C, opens vibration, two-phase is fully mixed.Stop oscillation after vibration 20min, stratification, upper strata is aqueous phase, lower floor is ionic liquid phase, record two-phase volume.Get 1ml aqueous phase, dilute the concentration with spectrophotometric analysis wherein contained Diacetylmonoxime after 100 times with deionized water.And then according to two-phase mixture product value before and after the mass balance of total system Diacetylmonoxime and extraction, the concentration of Diacetylmonoxime in ionic liquid can be calculated.Can calculate distribution ratio is thus 6.49, and percentage extraction is 86.66%.
Embodiment 4
Get Diacetylmonoxime concentration is 1g/L (1000ppm), ammonium sulfate concentrations is 40wt% the aqueous solution and ionic liquid [BMIM] PF
6both are joined in graduated centrifuge tube with the ratio of 1:1 by each 2ml respectively, then put into constant temperature oscillation in water-bath vibration shaking table, oscillation frequency 200Hz, and temperature controls at about 30 DEG C, opens vibration, two-phase is fully mixed.Stop oscillation after vibration 20min, stratification, upper strata is aqueous phase, lower floor is ionic liquid phase, record two-phase volume.Get 1ml aqueous phase, dilute the concentration with spectrophotometric analysis wherein contained Diacetylmonoxime after 100 times with deionized water.And then according to two-phase mixture product value before and after the mass balance of total system Diacetylmonoxime and extraction, the concentration of Diacetylmonoxime in ionic liquid can be calculated.Can calculate distribution ratio is thus 1.8, and percentage extraction is 64.28%.
Embodiment 5
Get Diacetylmonoxime concentration is 10g/L (10000ppm), ammonium sulfate concentrations is 40wt% the aqueous solution and ionic liquid [BMIM] PF
6both are joined in graduated centrifuge tube with the ratio of 1:1 by each 2ml respectively, then put into constant temperature oscillation in water-bath vibration shaking table, oscillation frequency 200Hz, and temperature controls at about 30 DEG C, opens vibration, two-phase is fully mixed.Stop oscillation after vibration 40min, stratification, upper strata is aqueous phase, lower floor is ionic liquid phase, record two-phase volume.Get 1ml aqueous phase, dilute the concentration with spectrophotometric analysis wherein contained Diacetylmonoxime after 100 times with deionized water.And then according to two-phase mixture product value before and after the mass balance of total system Diacetylmonoxime and extraction, the concentration of Diacetylmonoxime in ionic liquid can be calculated.Can calculate distribution ratio is thus 11.76, and percentage extraction is 92.17%.
Embodiment 6
Get 1ml ionic liquid [BMIM] PF
6with 5ml Diacetylmonoxime concentration be 5g/L (5000ppm), ammonium sulfate concentrations is the aqueous solution of 40wt%, both are joined in graduated centrifuge tube respectively with the ratio of 1:5, put into constant temperature oscillation in water-bath vibration shaking table again, oscillation frequency 200Hz, temperature controls at about 30 DEG C, open vibration, two-phase is fully mixed.Stop oscillation after vibration 40min, stratification, upper strata is aqueous phase, lower floor is ionic liquid phase, record two-phase volume.Get 1ml aqueous phase, dilute the concentration with spectrophotometric analysis wherein contained Diacetylmonoxime after 100 times with deionized water.And then according to two-phase mixture product value before and after the mass balance of total system Diacetylmonoxime and extraction, the concentration of Diacetylmonoxime in ionic liquid can be calculated.Can calculate distribution ratio is thus 8.38, and percentage extraction is 62.62%.
Embodiment 7
Get Diacetylmonoxime concentration is 5g/L (5000ppm), ammonium sulfate concentrations is 40wt% the aqueous solution and ionic liquid [BMIM] PF
6both are joined in graduated centrifuge tube with the ratio of 1:1 by each 2ml respectively, then put into constant temperature oscillation in water-bath vibration shaking table, oscillation frequency 200Hz, and temperature controls at about 40 DEG C, opens vibration, two-phase is fully mixed.Stop oscillation after vibration 40min, stratification, upper strata is aqueous phase, lower floor is ionic liquid phase, record two-phase volume.Get 1ml aqueous phase, dilute the concentration with spectrophotometric analysis wherein contained Diacetylmonoxime after 100 times with deionized water.And then according to two-phase mixture product value before and after the mass balance of total system Diacetylmonoxime and extraction, the concentration of Diacetylmonoxime in ionic liquid can be calculated.Can calculate distribution ratio is thus 13, and percentage extraction is 92.86%.
Claims (1)
1. utilize ionic liquid [BMIM] PF
6the method of the Diacetylmonoxime in extraction ammoniumsulphate soln, is characterized in that comprising the steps:
(1) ionic liquid is extracted with mixing by 1:1-1:5 volume ratio containing the ammoniumsulphate soln of Diacetylmonoxime, extraction temperature is 30-40 DEG C, extraction time is 20-40min, extract rear stratification, upper strata is aqueous phase, lower floor is ionic liquid phase, Diacetylmonoxime be enriched to from aqueous phase ionic liquid mutually in;
(2) by the method for underpressure distillation steam ionic liquid mutually in Diacetylmonoxime, the ionic liquid recycle obtained, ionic liquid is 1-butyl-3-Methylimidazole hexafluorophosphate;
Described is 1000-10000 mg/L containing the Diacetylmonoxime content in the ammoniumsulphate soln of Diacetylmonoxime, and ammonium sulfate concentrations is not more than 40wt%.
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Address after: 210046 Yaojia Road, Qixia District, Nanjing, Jiangsu Province Co-patentee after: Zhejiang University Patentee after: China Construction Installation Group Co., Ltd. Address before: 210046 Yaojia Road, Qixia District, Nanjing, Jiangsu Province Co-patentee before: Zhejiang University Patentee before: China Construction Industrial Equipment Installation Co., Ltd. |
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