CN101219840A - Method for recycling ion liquid from filature wastewater - Google Patents
Method for recycling ion liquid from filature wastewater Download PDFInfo
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- CN101219840A CN101219840A CNA2008100521535A CN200810052153A CN101219840A CN 101219840 A CN101219840 A CN 101219840A CN A2008100521535 A CNA2008100521535 A CN A2008100521535A CN 200810052153 A CN200810052153 A CN 200810052153A CN 101219840 A CN101219840 A CN 101219840A
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The invention relates to a method for recycling the ionic liquid in spinning wastewater, which comprises the processes: first, the spinning wastewater is pretreated by precipitating, roughly filtering as well as finely filtering to obtain the pretreatment solution; then, the pretreatment solution is processed by ultrafiltration process to obtain the water solution of the ionic liquid with mass concentration of 0.01-5 percent and the separated cellulose and the cellulose in polyacrylonitrile or the polyacrylonitrile are further processed by ultrafiltration washing and concentration or drying and then the obtained solution is recycled; ultrafiltration membrane of molecular weight cutoff adopted by the ultrafiltration process is 6000-50000 and the operation pressure is 0.01-0.5MPa; the obtained ultrafiltration water solution is further processed by nanofiltration and the reverse osmosis to obtain concentration solution of the ionic liquid with mass concentration of 5-30 percent and removed water after concentration is recycled and reused; the desalinization ratio of the nanofiltration membrane is 50-98 percent and the operation pressure is 0.4-1.0MPa; the desalinization ratio of the reverse osmosis membrane is 98 percent and the operation pressure is 1.0-15MPa; at last, the concentration solution of the ionic solution is decompressed and distilled under 60-110 DEG C to obtain the ionic solution with purity of 95-99 percent.
Description
Technical field
The present invention relates to a kind of separatory membrane utilisation technology, be specially a kind of ion liquid method that adopts in the separatory membrane recycle-water solution, particularly be applicable to and reclaim ion liquid method from Mierocrystalline cellulose or polyacrylonitrile filature wastewater, international Patent classificating number intends being Int.Cl.D01F 13/02 (2006.01).
Background technology
Ionic liquid is made up of negatively charged ion such as alkyl pyridine or di-alkyl-imidazole quaternary ammonium cation and tetrafluoroborate, hexafluoro-phosphate radical, nitrate radical, halogens usually, has strong polarity, non-volatile, not oxidation, solvability is good and to good characteristics such as most stable reagents.Ionic liquid at room temperature is as a kind of novel green solvent, and beginning is studied widely and is applied to has good social effect in the spinning fibre cellulose fiber engineering.But because ion liquid costing an arm and a leg, industrial production is very limited.Therefore the efficient recovery ionic liquid is the key of this novel green solvent of large-scale industrial application from filature wastewater.
About reclaim the existing many reports of ion liquid technology from waste liquid or waste water, for example: Chinese patent CN 1375103A has reported a kind of ion liquid recycle method of using in the nuclear fuel of processing.This method is the heating of reducing pressure under 200-300 ℃ of condition of the useless ionic liquid that will contain nuclear substance, the volatility pyrolysis product of collection of ions liquid allows such product and reaction reagent synthesize ionic liquid, complex steps again then, it is bigger to consume energy, and synthesis cycle is long again, cost is high; Chinese patent CN1531988A discloses a kind of method that adopts method separating ionic liquid from mixture of fractionation by adsorption.This method needs the stationary phase as absorption impurity such as silica gel, resin, ion-exchanger, aluminum oxide, gac, zeolite, the renewal cost of stationary phase is higher, product after the removal of impurities is the ion liquid solution of inferior quality concentration, does not realize pure ion liquid recovery, and efficient is low; What Chinese patent CN101003510A invented is a kind of thick ion liquid method that adopts the molecular distillation purifying to contain Analysis of Volatile Organic Impurity, and same efficient is lower, the industrial application difficulty; Chinese patent CN1944357A has reported a kind of method that reclaims hydrophilic ionic liquids through alkalization (or acidifying) recovery hydrophobic ionic liquid and employing solvent extraction.This method has been introduced plurality of reagents, also needs post-processing steps such as washing, decolouring, dehydration, long flow path, cost height; Chinese patent CN1910124A and Korean Patent KR20050114213 have reported the ion liquid technology of employing distillatory method purifying, U.S. Pat 2007095645 has also been reported a kind of the 60-350 ℃ of ion liquid method of method purifying that adopts normal pressure or underpressure distillation down, but these purification process are not suitable for and resemble in the lower waste water of this ionic liquid content of filature wastewater, because cost is too high; Chinese patent CN 1973943A discloses the ion liquid method of a kind of recovery.This method adds the inorganic salt (mass ratio 1 of the aqueous solution and inorganic salt: 0.4-0.8) in the ion liquid aqueous solution, be cooled to 0 ℃ then--20 ℃, after forming rich ionic liquid phase and rich salt face, again ionic liquid is collected mutually, dewatered, can obtain ionic liquid.This method power consumption is high, and a large amount of high quality concentration brine treatment difficulties, has brought new problem; Chinese patent CN1804161A has announced a kind of recovery method of cellulose spinning waste water intermediate ion liquid, this method adopts the operation of spinning coagulation bath waste water through precipitation-filtration-underpressure distillation-air distillation, makes as cellosolve and is effectively reclaimed by the ionic liquid that wet-spinning enters precipitation bath.But because the ion liquid content in the filature wastewater is lower, so the straight run distillation energy consumption is higher, is unfavorable for energy-saving and emission-reduction.
Summary of the invention
At the deficiencies in the prior art, technical problem to be solved by this invention is that a kind of ion liquid method that reclaims from filature wastewater is provided.This method is specially adapted to the ionic liquid in recycled fiber element or the polyacrylonitrile filature wastewater, and it is simple to have technology, and energy consumption is low, and discharging is few, and ionic liquid rate of recovery height is with low cost, is applicable to characteristics such as industrial applications.
The technical scheme that the present invention solve the technical problem is, designs a kind of ion liquid method that reclaims from filature wastewater, and this method is applicable to from Mierocrystalline cellulose or polyacrylonitrile filature wastewater and reclaims ionic liquid that concrete technology comprises:
1. pre-treatment, successively through precipitation, coarse filtration and smart filter pretreatment process, its interior mechanical impurity of filtering gets pretreatment fluid the filature wastewater that contains Mierocrystalline cellulose or polyacrylonitrile;
2. ultrafiltration technology is handled, and the 1st step gained pretreatment fluid is carried out ultrafiltration technology handle, and obtains containing the ionic liquid aqueous solution that mass concentration is 0.01-5%; The isolated Mierocrystalline cellulose or the polyacrylonitrile aqueous solution return pretreatment fluid, perhaps harmless emission after further ultrafiltration and concentration is handled recycled fiber element or polyacrylonitrile; The molecular weight cut-off of the ultra-filtration membrane that described ultrafiltration technology adopts is 6000-50000, and ultrafiltration pressure is 0.01-0.5MPa;
3. nanofiltration or reverse osmosis concentration are handled, and adopt nanofiltration technique or resulting ionic liquid aqueous solution of the 2nd step of reverse osmosis process concentration, and obtaining mass concentration is the ionic liquid concentrated solution of 5-30%, concentrates the moisture of removing and reclaims or reuse; The ratio of desalinization of the nanofiltration membrane that described nanofiltration technique uses (1000ppmNaCl) is 50-98%, and working pressure is 0.4-1.0MPa; The ratio of desalinization (1000ppmNaCl) of the reverse osmosis membrane that described reverse osmosis process uses is 98%, and working pressure is 1.0-15MPa;
4. underpressure distillation is handled, and under 60-110 ℃, underpressure distillation removes the ionic liquid concentrated solution that the 3rd step of water treatment obtains, and can obtain the ionic liquid that purity is 95-99%.
Compared with prior art, the inventive method has following advantage:
1. energy consumption is low, and the present invention adopts membrane technique to remove polymkeric substance in the spinning solution, and the concentrating ion liquid aqueous solution, and required energy consumption is far below art methods such as straight run distillation;
2. reduce discharging, the product of described each processing step of the inventive method: all recyclable or utilization again of polymkeric substance, water and ionic liquid, and need not to add any additives, can realize not having discharging or few discharging, and emission of substance does not pollute, precious resources is utilized effectively, and is the method for a kind of environmental protection and ecological circulation;
3. technology is simple, and rate of recovery height is with low cost, and the relative processing method of the inventive method is simple, and ionic liquid rate of recovery height is with low cost, is suitable for industrialization promotion and uses.
Description of drawings
Fig. 1 reclaims the process flow diagram of a kind of embodiment of ionic liquid method from filature wastewater for the present invention.
Embodiment
The present invention will be further described below in conjunction with embodiment and accompanying drawing thereof:
The ion liquid method (hereinafter to be referred as method) that reclaims from filature wastewater of the present invention's design is applicable to the solvent of recovery as Mierocrystalline cellulose or polyacrylonitrile, enter ionic liquid in the precipitation bath by wet-spinning, specifically, the described filature wastewater of the inventive method is meant the filature wastewater that the spinning fibre cellulose fiber is produced, the filature wastewater that perhaps spins polyacrylonitrile fibre and produced, spinning fibre cellulose fiber fiber or spinning polyacrylonitrile fibre all use as its solvent with ionic liquid, for example, described ionic liquid comprises the used 1-allyl group of spinning fibre cellulose fiber-3-Methylimidazole villaumite, 1-butyl-3-Methylimidazole villaumite or 1-(2-hydroxyethyl)-3-Methylimidazole villaumite etc.; 1-butyl-3-methyl imidazolium tetrafluoroborate that the spinning polyacrylonitrile fibre is used etc.Ionic liquid mass concentration in the described filature wastewater is generally 0.01-5%.The spinning processes that is adopted is conventional wet spinning technology.The used precipitation bath of spinning technique is a water.
The concrete technology of the inventive method comprises (referring to Fig. 1):
1. pre-treatment.The filature wastewater that contains Mierocrystalline cellulose or polyacrylonitrile successively through precipitation, coarse filtration and smart filter pretreatment process, filtering mechanical impurity in it, pretreatment fluid (promptly contain Mierocrystalline cellulose or polyacrylonitrile but do not contain the ionic liquid aqueous solution of mechanical impurity).Described precipitation, coarse filtration and smart filtering technology are routine techniques, and not having newly can be old.Described Mierocrystalline cellulose comprises wood pulp cellulose, Microcrystalline Cellulose, poly-suede cotton fibre etc.
2. ultrafiltration technology is handled.The 1st step gained pretreatment fluid is carried out ultrafiltration technology handle, obtaining (not cellulose or polyacrylonitrile), only to contain mass concentration be the ion liquid ultrafiltration aqueous solution of 0.01-5% (being ionic liquid aqueous solution); The ultra-filtration membrane that described ultrafiltration technology adopts can be selected the ultra-filtration membrane of certain molecular weight cut-off according to the molecular weight of Mierocrystalline cellulose or polyacrylonitrile, and the general range of ultra-filtration membrane molecular weight cut-off is 6000-50000, and the ultrafiltration pressure that is adopted is 0.01-0.5MPa.In this road ultrafiltration technology, mainly be separating ionic liquid and Mierocrystalline cellulose or polyacrylonitrile superpolymer, the ionic liquid mass concentration of the gained ultrafiltration aqueous solution and the ionic liquid mass concentration of pretreatment fluid do not have to change substantially.The isolated Mierocrystalline cellulose or the polyacrylonitrile aqueous solution promptly turn back in the pretreatment fluid because of containing the reuse of small amount of ionic liquid body, carry out ultrafiltration technology once more and handle.As required, the isolated Mierocrystalline cellulose or the polyacrylonitrile aqueous solution also can be after further ultrafiltration and concentration be handled, recycled fiber element or polyacrylonitrile, harmless emission then; Certainly, isolated ionic liquid aqueous solution can turn back in the pretreatment fluid in further ultrafiltration and concentration treating processes, carries out ultrafiltration technology once more and handles (not drawing among Fig. 1).Even described isolated Mierocrystalline cellulose of the inventive method or the neither reuse of the polyacrylonitrile aqueous solution when also not doing further processing recycled fiber element or polyacrylonitrile, also can be accomplished low evil or the directly discharging (not drawing among Fig. 1) of few evil.
3. nanofiltration or reverse osmosis concentration are handled.Adopt the nanofiltration technique or the resulting ultrafiltration aqueous solution of the 2nd step of reverse osmosis process concentration, can obtain mass concentration is the ionic liquid concentrated solution of 5-30%.When adopting the nanofiltration technique concentration, the ratio of desalinization of used nanofiltration membrane (1000ppm NaCl) is 50-98%, and working pressure is 0.4-1.0MPa; When adopting the reverse osmosis process concentration, the ratio of desalinization of used reverse osmosis membrane (1000ppm NaCl) is 98%, and working pressure is 1.0-15MPa.Along with the carrying out of concentration process, the ionic liquid mass concentration in the original solution increases, and also can increase through flow velocity decline and through the ion liquid mass concentration in the liquid, therefore according to circumstances is concentrated to 5-30%.This road process using nanofiltration (film) technology still adopts reverse osmosis (film) technology concentration, depends on ion liquid molecular weight and the valence state of adopting.Employing nanofiltration or reverse osmosis process technology can be removed the most of moisture in the ultrafiltration aqueous solution in this road technological process, obtain the ionic liquid aqueous solution (being the ionic liquid concentrated solution) of high quality concentration.Concentrate the recyclable or reuse of moisture of removing.
4. underpressure distillation is handled.Under 60-110 ℃, underpressure distillation removes resulting ionic liquid concentrated solution of the 2nd step of water treatment, can obtain the ionic liquid that purity is 95-99%.Itself is same as prior art reduced pressure distillation process.
With the matching used equipment of the inventive method, as ultra-filtration equipment and nanofiltration device or reverse osmosis unit this as prior art, perhaps only need to require to do the adaptability repacking according to the inventive method and get final product, those of ordinary skills can finish easily without creative work.
The inventive method both can be used as the supporting use of chemical fibre (spinning) factory, also can be used as the special use of independently wastewater treatment enterprise.The simple process flow of a kind of embodiment when the inventive method is used as chemical fibre (spinning) factory is supporting as shown in Figure 1.When the inventive method was used for chemical fibre (spinning) factory, concentrating the moisture remove in described nanofiltration or ro treatment technology can direct reuse, promptly turns back to again in the precipitation bath, recycles.
The present invention does not address part and is applicable to prior art.
Provide the specific embodiment of the inventive method below, but the inventive method claim is not subjected to the restriction of specific embodiment:
Embodiment 1
Handling with ionic liquid 1-allyl group-3-Methylimidazole villaumite with the inventive method is that solvent prepares the filature wastewater that the wood pulp cellulose cellulose fiber obtains, and its ion liquid mass concentration is 0.01%:
1. pre-treatment.Successively through precipitation, coarse filtration and smart filter pretreatment process, its interior mechanical impurity of filtering gets pretreatment fluid the filature wastewater that contains the wood pulp cellulose cellulose fiber.
2. ultrafiltration technology is handled.Adopting molecular weight cut-off is that ultra-filtration membrane ultra-filtration and separation under 0.01MPa of 6000 is handled resulting pretreatment fluid of the 1st step, and the mass concentration that is not contained wood pulp cellulose still is about 0.01% ionic liquid aqueous solution; The isolated wood pulp cellulose aqueous solution directly turns back in the pretreatment fluid.
3. nanofiltration concentration.Resulting ionic liquid aqueous solution of the 2nd step is carried out the nanofiltration concentration as the spissated former water of nanofiltration, and the ratio of desalinization of used nanofiltration membrane (1000ppm NaCl) is 50%, and the nanofiltration working pressure is 0.4MPa; The mass concentration of the ionic liquid aqueous solution after the concentration is 5%; The pure water that nanofiltration sees through is again as solidifying the bath water reuse.
4. underpressure distillation is handled.Under 60 ℃, the 3rd ionic liquid concentrated solution underpressure distillation that goes on foot gained is dewatered, promptly obtaining purity is 95% ionic liquid.
Embodiment 2
Handling with ionic liquid 1-butyl-3-methyl imidazolium tetrafluoroborate with the inventive method is that solvent prepares the filature wastewater that polyacrylonitrile fibre obtains, and its ion liquid mass concentration is 0.5%:
1. with embodiment 1;
2. ultrafiltration technology is handled.Adopting molecular weight cut-off is that ultra-filtration membrane ultra-filtration and separation under 0.1MPa of 10000 is handled resulting pretreatment fluid of the 1st step, and the mass concentration that is not contained polyacrylonitrile still is about 0.5% ionic liquid aqueous solution; The isolated polyacrylonitrile aqueous solution directly turns back in the pretreatment fluid.
3. nanofiltration concentration.Resulting ionic liquid aqueous solution of the 2nd step is carried out the nanofiltration concentration as the spissated former water of nanofiltration, and the ratio of desalinization of used nanofiltration membrane (1000ppm NaCl) is 50%, and the nanofiltration working pressure is 0.4MPa; The mass concentration of the ionic liquid aqueous solution after the concentration is 5%; The pure water that nanofiltration sees through is again as solidifying the bath water reuse.
4. underpressure distillation is handled.Under 60 ℃, the 3rd ionic liquid concentrated solution underpressure distillation that goes on foot gained is dewatered, promptly obtaining purity is 95% ionic liquid.
Embodiment 3
Handling with ionic liquid 1-butyl-3-Methylimidazole villaumite with the inventive method is that solvent prepares the filature wastewater that Mierocrystalline cellulose (Microcrystalline Cellulose) fiber obtains, and its ion liquid mass concentration is 3%:
1. with embodiment 1;
2. ultrafiltration technology is handled.Adopting molecular weight cut-off is that ultra-filtration membrane ultra-filtration and separation under 0.01MPa of 6000 is handled resulting pretreatment fluid of the 1st step, and the mass concentration that is not contained Microcrystalline Cellulose still is about 1% ionic liquid aqueous solution; Isolated cellulose aqueous solution directly turns back in the pretreatment fluid.
3. nanofiltration concentration.Resulting ionic liquid aqueous solution of the 2nd step is carried out the nanofiltration concentration as the spissated former water of nanofiltration, and the ratio of desalinization of used nanofiltration membrane (1000ppm NaCl) is 98%, and the nanofiltration working pressure is 1.0MPa; The mass concentration of the ionic liquid aqueous solution after the concentration is 1%; The pure water that nanofiltration sees through is again as solidifying the bath water reuse.
4. underpressure distillation is handled.Under 80 ℃, the 3rd ionic liquid concentrated solution underpressure distillation that goes on foot gained is dewatered, promptly obtaining purity is 99% ionic liquid.
Embodiment 4
Handling with ionic liquid 1-(2-hydroxyethyl)-3-Methylimidazole villaumite with the inventive method is the filature wastewater that the poly-linters of solvent preparation obtains, and its ion liquid mass concentration is 5%:
1. with embodiment 1.
2. ultrafiltration technology is handled.Adopting molecular weight cut-off is that ultra-filtration membrane ultra-filtration and separation under 0.5MPa of 50000 is handled resulting pretreatment fluid of the 1st step, and the mass concentration that is not contained poly-linters still is about 5% ionic liquid aqueous solution; Isolated cellulose aqueous solution directly turns back in the pretreatment fluid.
3. reverse osmosis concentration is handled.The former water of resulting ionic liquid aqueous solution of the 2nd step being made reverse osmosis concentration carries out reverse-osmosis treated, and the ratio of desalinization of used reverse osmosis membrane (1000ppm NaCl) is 98%, and the reverse osmosis working pressure is 15MPa; The mass concentration that obtains ionic liquid aqueous solution after the concentration is 30%; The pure water that reverse-osmosis treated sees through is again as solidifying the bath water reuse.
4. underpressure distillation is handled.Under 110 ℃, the 3rd ionic liquid concentrated solution underpressure distillation that goes on foot gained is dewatered, promptly obtaining purity is 99% ionic liquid.
Claims (2)
1. one kind is reclaimed ion liquid method from filature wastewater, and this method is applicable to from Mierocrystalline cellulose or polyacrylonitrile filature wastewater and reclaims ionic liquid that concrete technology comprises:
(1). pre-treatment, successively through precipitation, coarse filtration and smart filter pretreatment process, its interior mechanical impurity of filtering gets pretreatment fluid the filature wastewater that contains Mierocrystalline cellulose or polyacrylonitrile;
(2). ultrafiltration technology is handled, and the 1st step gained pretreatment fluid is carried out ultrafiltration technology handle, and obtains containing the ionic liquid aqueous solution that mass concentration is 0.01-5%; The isolated Mierocrystalline cellulose or the polyacrylonitrile aqueous solution return pretreatment fluid, perhaps harmless emission after further ultrafiltration and concentration is handled recycled fiber element or polyacrylonitrile; The molecular weight cut-off of the ultra-filtration membrane that described ultrafiltration technology adopts is 6000-50000, and ultrafiltration pressure is 0.01-0.5MPa;
(3). nanofiltration or reverse osmosis concentration are handled, and adopt nanofiltration technique or resulting ionic liquid aqueous solution of the 2nd step of reverse osmosis process concentration, and obtaining mass concentration is the ionic liquid concentrated solution of 5-30%, concentrates the moisture of removing and reclaims or reuse; The ratio of desalinization of the nanofiltration membrane that described nanofiltration technique uses (1000ppmNaCl) is 50-98%, and working pressure is 0.4-1.0MPa; The ratio of desalinization (1000ppmNaCl) of the reverse osmosis membrane that described reverse osmosis process uses is 98%, and working pressure is 1.0-15MPa;
(4). underpressure distillation is handled, and under 60-110 ℃, underpressure distillation removes the ionic liquid concentrated solution that the 3rd step of water treatment obtains, and can obtain the ionic liquid that purity is 95-99%.
2. according to claim 1ly from filature wastewater, reclaim ion liquid method, it is characterized in that when the inventive method is used for the chemical fibre factory the concentrated moisture of removing directly turns back in the precipitation bath and recycles in described nanofiltration or ro treatment technology.
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Cited By (11)
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| CN102120656A (en) * | 2011-01-29 | 2011-07-13 | 无锡恩奈迪环保设备有限公司 | Process for recycling isomerized mother liquor of phthalic anhydride wastewater |
| CN102167465A (en) * | 2011-03-17 | 2011-08-31 | 天津工业大学 | Recovery method of spinning waste liquor by means of concentrating |
| CN102371078A (en) * | 2010-08-10 | 2012-03-14 | 中国科学院过程工程研究所 | Recovery method for ionic liquid solvent generated from homogeneous acylation reaction of cellulose |
| CN101787398B (en) * | 2010-01-22 | 2012-07-25 | 中国科学院过程工程研究所 | Method for purifying, reclaiming and condensing sugar in lignocellulose prehydrolysis liquid |
| CN103451711A (en) * | 2013-08-13 | 2013-12-18 | 河南辉龙铝业股份有限公司 | Zero discharge treatment method of aluminum profile anodizing wastewater |
| CN105203372A (en) * | 2014-05-26 | 2015-12-30 | 中国科学院大连化学物理研究所 | Method for removing ionic liquid in sample solution |
| CN107287700A (en) * | 2016-03-31 | 2017-10-24 | 东莞新科技术研究开发有限公司 | The recovery method of ionic liquid |
| CN107670507A (en) * | 2017-10-12 | 2018-02-09 | 北京化工大学 | A kind of method separated using pervaporation method with concentrating ion liquid |
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| CN102371078A (en) * | 2010-08-10 | 2012-03-14 | 中国科学院过程工程研究所 | Recovery method for ionic liquid solvent generated from homogeneous acylation reaction of cellulose |
| CN102371078B (en) * | 2010-08-10 | 2013-10-16 | 中国科学院过程工程研究所 | Recovery method for ionic liquid solvent generated from homogeneous acylation reaction of cellulose |
| CN102120656A (en) * | 2011-01-29 | 2011-07-13 | 无锡恩奈迪环保设备有限公司 | Process for recycling isomerized mother liquor of phthalic anhydride wastewater |
| CN102120656B (en) * | 2011-01-29 | 2012-06-20 | 无锡恩奈迪环保设备有限公司 | Process for recycling isomerized mother liquor of phthalic anhydride wastewater |
| CN102167465A (en) * | 2011-03-17 | 2011-08-31 | 天津工业大学 | Recovery method of spinning waste liquor by means of concentrating |
| CN103451711A (en) * | 2013-08-13 | 2013-12-18 | 河南辉龙铝业股份有限公司 | Zero discharge treatment method of aluminum profile anodizing wastewater |
| CN105203372A (en) * | 2014-05-26 | 2015-12-30 | 中国科学院大连化学物理研究所 | Method for removing ionic liquid in sample solution |
| CN107287700A (en) * | 2016-03-31 | 2017-10-24 | 东莞新科技术研究开发有限公司 | The recovery method of ionic liquid |
| CN107670507A (en) * | 2017-10-12 | 2018-02-09 | 北京化工大学 | A kind of method separated using pervaporation method with concentrating ion liquid |
| CN107670507B (en) * | 2017-10-12 | 2020-09-22 | 北京化工大学 | Method for separating and concentrating ionic liquid by pervaporation method |
| CN108295660A (en) * | 2018-04-23 | 2018-07-20 | 上海飞态环保科技有限公司 | A kind of heat-sensitive substance concentration systems and its method |
| WO2021215442A1 (en) * | 2020-04-24 | 2021-10-28 | ニプロ株式会社 | Pretreatment method and pretreatment system for drainage |
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| CN114591181A (en) * | 2022-03-24 | 2022-06-07 | 宁波原力新材料有限公司 | Method for preparing high-purity ionic liquid |
| CN114591181B (en) * | 2022-03-24 | 2024-04-19 | 原力新材料(合肥)有限公司 | Method for preparing high-purity ionic liquid |
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