232 results about "Polymeric adsorbent" patented technology

According to the organic wastewater energy-saving treatment system provided by the invention, organic matters in organic wastewater can be greatly reduced through oil separation treatment of the reservoir and filtration and coalescence separation treatment of the filtration coalescence device, so that the purpose of recovering the organic matters is achieved; through multi-effect evaporation of the I-effect falling film evaporator, the II-effect falling film evaporator and the forced circulation evaporator, generated steam is recycled through the MVR compressor, cyclic utilization of secondary steam energy is achieved, and energy consumption is reduced; and the wastewater can be recycled through a multi-effect evaporation and resin adsorption treatment mode, and the recovery rate reaches 96%. The steam consumption for wastewater treatment can be reduced by 0.90 t / m < 3 >.

The invention discloses a method for extracting ginsenoside based on a supercritical extraction method, and relates to the technical field of traditional Chinese medicine extraction. The ginsenoside is extracted through a supercritical extraction method, the extraction process is convenient and efficient, the purity of the ginsenoside is high, organic solvent residues are avoided, the method is green and environmentally friendly, carbon dioxide can be recycled, and the operation cost is low; through degreasing pretreatment, fat-soluble components in ginseng powder are removed, the extraction purity of saponin is increased, the solid loading capacity of supercritical extraction is reduced, the mass transfer resistance is reduced, and the extraction efficiency is improved; the ginsenoside is purified in a post-treatment mode of resin adsorption and elution, polar impurities can be further removed, glutamine is adopted for surface functionalization of the resin, acylamino and carboxyl are introduced to the surface of the resin and can form hydrogen bonds with phenolic hydroxyl groups in the ginsenoside, functional adsorption is achieved, meanwhile, impurities are removed, and the content of the ginsenoside is increased. Reaction conditions are simple and mild, and adsorption efficiency is high.

The invention provides a production process of SEMI-G5-grade high-purity NMP (N-Methyl Pyrrolidone), which is characterized in that metal ions, magnetic foreign / non-magnetic foreign particulate matters and the like of conventional industrial-grade NMP are completely removed by adopting a multi-section rectification, resin adsorption and precise filtration process, so that the SEMI-G5-grade NMP reaches the SEMI-G5 grade in an ultra-clean high-purity reagent; and the use requirements on the ultra-clean high-purity NMP in the fields of semiconductors, integrated circuits and novel display are met.

The invention provides a resin tower regeneration cycle optimization method based on an AI algorithm. The method comprises the following steps: S1, continuously monitoring the calcium and magnesium ion concentration of salt water at an outlet of a resin tower on line; s2, collecting operation parameters associated with the adsorption process of the resin tower, wherein the operation parameters comprise the salt water double-alkali excess alkali amount, turbidity, pH, ORP, flow, temperature and resin tower pressure difference; s3, constructing a resin adsorption capacity dynamic prediction model and a resin tower outlet calcium and magnesium content dynamic prediction model based on the calcium and magnesium ion concentration monitored in the step S1 and the operation parameters collected in the step S2; and S4, constraint conditions are set through a multi-objective optimization algorithm, a regeneration opportunity decision matrix is generated based on the real-time prediction data of the two dynamic prediction models constructed in the step S3, and the constraint conditions are used for judging whether a resin tower regeneration program is triggered or not. Dynamic optimization of the regeneration period of the resin tower can be realized, the quality of saline water is guaranteed, the regeneration frequency and material consumption are reduced, the production cost of an enterprise is reduced, and the operation efficiency of the resin tower is improved.

The invention discloses a method for efficiently extracting and recovering valuable elements from tailings. The method comprises the steps of gradient crushing-morphology separation, rotational flow reselection-flotation coupling, enhanced alkaline leaching, biological oxidation-acid leaching collaboration, membrane electrolysis enrichment, extraction resin deep recovery and tail water zero discharge treatment. According to the method, metal is pre-enriched through gradient crushing-morphology separation; after rotational flow classification, minerals of different size fractions are recycled through gravity separation and flotation; metal with different chemical forms is dissolved through three-stage synergism of alkaline leaching, biological oxidation and acid leaching; selective deposition of valuable metal in the solution is realized through membrane electrolysis; adsorbing and recovering rare earth by using extraction resin; and tail water closed-loop treatment. According to the method, the aim of multi-element collaborative recovery is achieved, meanwhile, the recovery rate of coarse-grain gold is increased, meanwhile, high-temperature roasting is replaced with biological oxidation, energy consumption is reduced, full recycling of waste water can be achieved, and the method is quite suitable for efficient recovery of valuable elements in metal mine tailings.

The application discloses a zinc-containing high-concentration high-salt production wastewater resource utilization method of gliclazide, and relates to the technical field of wastewater, and comprises the following steps: mixing raw water and dilution water according to a proportion and adjusting a pH value, removing zinc ions in the mixed wastewater to obtain treated wastewater; the treated wastewater is introduced into a running branch of a fixed bed resin adsorption device at a preset flow rate, nitrogen heterocyclic organic matter is adsorbed and separated through a resin adsorption column, the COD value of effluent water is monitored, and when the COD value exceeds a set value, the treated wastewater is switched to a standby branch to be evaporated and concentrated to recover sodium chloride; saturated resin is regenerated by countercurrent regeneration with methanol, and methanol washing liquid and water washing liquid obtained through the regeneration are recovered through a rectifying column, and the methanol recovered at the top of the rectifying column is recycled for resin regeneration. The application solves the problems, such as unstable treatment effect, high operation cost and low resource recovery rate, which are commonly present in the prior art when treating the wastewater.

Disclosed are an integrated device for multiphase extraction and tail gas and wastewater treatment and a control method therefor. The integrated device comprises at least one set of small multiphase extraction units connected to an extraction well, a reagent tank storing a solubilizing agent and an oxidizing agent, a resin adsorption tower, an oil-water separator, a photocatalytic reactor, an oil storage tank, a heating system for heating the reagent tank and the oil-water separator and providing high-temperature steam for the resin adsorption tower, and a controller, wherein the reagent tank is separately connected to the extraction well and the photocatalytic reactor. Each multiphase extraction unit comprises a gas-liquid separator, a water ring vacuum pump, and a jet pump, wherein an extracted gas-liquid mixture undergoes gas-liquid separation by means of the gas-liquid separator, a waste gas is conveyed to the resin adsorption tower by means of the water ring vacuum pump, waste liquid and an extracted oil-water mixture are respectively conveyed to the oil-water separator by means of the jet pump, wastewater is conveyed to the photocatalytic reactor, and waste oil is conveyed to the oil storage tank. The present invention effectively ensures the stability and high efficiency of removal while realizing miniaturization.

According to the glufosinate-ammonium mother liquor decolorizing device provided by the invention, the glufosinate-ammonium mother liquor is decolorized by arranging the resin adsorption device, and the resin column in the resin adsorption device is filled with the resin, so that the glufosinate-ammonium mother liquor decolorizing device has the characteristics of large treatment capacity, easiness in regeneration and high cyclic utilization rate during decolorizing; the problems that the amount of generated hazardous waste is large and the hazardous waste is not easy to treat due to the fact that the usage amount is large and regeneration is not easy after adsorption saturation when activated carbon is adopted for decolorizing glufosinate-ammonium mother liquor wastewater in the prior art are solved. A first resin column and a second resin column in the resin adsorption device are connected with the mother liquor storage tank, the decolorizing mother liquor storage tank, the backflushing liquid storage tank and the solvent storage tank through a plurality of valves respectively, and the other resin column can continue to work when the first resin column or the second resin column is subjected to backflushing regeneration through control of the valves; and the continuous decoloring process is effectively ensured.

The invention relates to a method for high-value utilization of waste lithium iron phosphate battery lithium extraction slag, and belongs to the technical field of waste lithium ion battery resource utilization. The method comprises the following steps: S1, mixing the lithium iron phosphate lithium extraction slag with a low-concentration sulfuric acid solution in proportion, carrying out countercurrent washing, carrying out solid-liquid separation, carrying out acid dissolution on a solid, carrying out gradient recycling on a washing solution, and carrying out resin adsorption and reverse osmosis treatment on a high-impurity washing solution for recycling; s2, reacting the pretreated solid with medium-concentration sulfuric acid, reducing a dissolved solution by using iron powder, then carrying out solid-liquid separation to obtain a first batch of ferrous sulfate heptahydrate, adding concentrated sulfuric acid into mother liquor, carrying out secondary crystallization, then carrying out solid-liquid separation, and recrystallizing the obtained solid by using washing wastewater to obtain a second batch of ferrous sulfate heptahydrate; s3, recovering sulfuric acid by adopting a membrane treatment method, and recovering phosphoric acid from residual mother liquor by adopting an extraction method; or directly treating the lithium iron phosphate waste residue. According to the method, efficient separation and recovery of iron and phosphorus resources and full-component high-value utilization of the lithium iron phosphate lithium extraction slag are realized.

The invention provides a preparation method of clindamycin hydrochloride alcoholate. The preparation method comprises the following steps: firstly, preparing a chlorination reagent from an oily solvent, DMF (Dimethyl Formamide), a chlorination solvent and an antioxidant; carrying out temperature-controlled chlorination reaction with lincomycin hydrochloride to obtain a chlorination reaction solution; adjusting the pH value of the reaction solution to 10-11, controlling the temperature to react, taking an oil phase after the reaction is finished, concentrating under reduced pressure, diluting with water, and adjusting the pH value to 3-5 to obtain a column loading solution; the preparation method comprises the following steps: dissolving clindamycin hydrochloride in water, adsorbing by using resin, eluting impurities by using dilute alkaline water, analyzing by using ethanol and deionized water in sequence, collecting an analysis solution, concentrating under reduced pressure, adding ethanol, heating for dissolving, adjusting the pH value to 1-1.5, cooling for crystallizing, and drying to obtain the clindamycin hydrochloride alcoholate. According to the preparation method disclosed by the invention, the clindamycin alcoholate with high yield and high purity is prepared by pertinently designing processes such as reaction conditions, a specific oily reagent, temperature control conditions, column adsorption, dilute alkaline water impurity elution, ethanol desorption and the like, only one-time crystallization is needed, repeated refining is not needed, the HPLC (High Performance Liquid Chromatography) purity is up to 99.5% or above, and the clindamycin alcoholate is suitable for industrial production. And 0.14% or less of 2, 7-epiclindamycin.

The invention relates to new carbon dioxide (CO2) adsorbents based on modified weak base anion exchange resin (WBAER) sorbents comprising a crosslinked polymeric backbone containing appended primary and / or secondary amines. The WBAER materials are insoluble in water and common organic solvents, have surface areas of 5-50 m2 / g, and can be in either bead or powder form. The WBAER materials are suspended in water and / or polar organic solvents and treated with polyfunctional epoxide compounds to effect the modification. The modified materials exhibit significantly improved oxidative stability compared with the unmodified ion-exchange resins without significantly impacting their CO2 uptake capacity or CO2 uptake kinetics. The modified materials remain insoluble in water and common organic solvents and, therefore, are not susceptible to leaching under steam-based or moisture-based sorbent regeneration conditions.

A polymeric adsorbent including a polymer having reacted units of a tetraethylenepentamine (TEPA), reacted units of a 3,5-diacrylamidobenzoic acid, and reacted units of a methacrylamide. The TEPA, the 3,5-diacrylamidobenzoic acid, and the methacrylamide have a molar ratio of 2 to 4:1 to 3:0.5 to 2. Reacted units of the TEPA and reacted units of the 3,5-diacrylamidobenzoic acid are covalently crosslinked, and reacted units of the TEPA and reacted units of the methacrylamide are covalently crosslinked. The polymeric adsorbent of the present disclosure can be used for water treatment.

The invention provides a method for preparing nickel hydroxide from laterite-nickel ore, which comprises the following steps: after the laterite-nickel ore is pulped, carrying out iron and aluminum removal treatment to obtain iron and aluminum removed liquid; carrying out resin adsorption treatment on the iron and aluminum removed liquid to obtain nickel adsorbed resin; desorbing the nickel-adsorbed resin to obtain a nickel-rich solution, and sequentially carrying out copper and zinc removal, calcium and magnesium removal, fluorine removal treatment and silicon removal treatment to obtain a nickel salt solution; the nickel salt solution, the liquid caustic soda and the dispersing agent solution are injected into the base solution in a parallel flow mode, nickel hydroxide slurry is obtained through a co-precipitation reaction, and nickel hydroxide is obtained through post-treatment. According to the method, after the laterite-nickel ore is pulped to remove iron and aluminum, nickel is extracted through high selectivity of resin, nickel, manganese and cobalt can be separated and analyzed to obtain nickel-rich solutions, a purified nickel salt solution is obtained through series impurity removal, the purified nickel salt solution reacts with liquid caustic soda, and a high-purity nickel hydroxide product is prepared. And the nickel does not need to be recovered through a complex extraction process.

The invention provides a purification method of an industrial-grade organic carboxylic acid compound and a product. The purification method comprises the following steps: mixing and dissolving an industrial-grade organic carboxylic acid compound, organic alkali, an acidic chelating agent and water, and filtering to remove insoluble substances to obtain a first solution; enabling the first solution to pass through an adsorption resin column bed at a first flow rate until resin adsorption is saturated; eluting the column bed by using an electronic-grade organic alkali aqueous solution, an electronic-grade organic acid aqueous solution and ultrapure water in sequence; eluting with an electronic-grade eluent, and collecting the eluent; and carrying out rotary evaporation, recrystallization, filtration and drying on the eluent to obtain a purified organic carboxylic acid compound solid. According to the method, metal ion impurities in the organic carboxylic acid compound can be removed, the purification efficiency is high, universality is achieved, the process is simple, and large-scale production is easy to achieve.

A process for improving the thermal stability of an aqueous lactic acid composition is disclosed, which includes a heat treatment step and further comprises contacting the aqueous lactic acid composition with at least one adsorbent selected from the group consisting of activated carbon, polymeric adsorbents, ion exchange resins, and bleaching clay.

The invention relates to the field of embryo extract extraction, in particular to a corn embryo extract extraction method for optimizing collection efficiency, which comprises the following steps: adjusting the water content of corn, and crushing by using a fluted disc crusher; the crushing qualification is judged according to the crushing comprehensive efficiency index; determining an unqualified reason according to the corn crushing rate under the condition of unqualified crushing; separating germs from the qualified crushed corn by adopting a cyclone separator; judging the qualification of germ separation according to the germ purity characteristic value; under the condition of unqualified separation, determining the reason of unqualified separation according to the proportion of the abnormal germs; cleaning and drying the qualified separated germs, and adding a compound enzyme for enzymolysis; performing ultrasonic treatment on the mixture subjected to enzymolysis, and performing centrifugal separation to obtain supernatant liquid; adsorbing the supernatant liquid through macroporous adsorption resin, and carrying out gradient elution by adopting ethanol; and carrying out vacuum concentration on the eluent, and freeze-drying to obtain the corn embryo extract. According to the invention, the collection efficiency of the corn embryo extract is improved.

The invention relates to the technical field of acid gas removal, and discloses a method and a system for amine liquid purification and waste liquid coupling treatment. The method comprises the following steps: (1) introducing amine liquid to be purified into an impurity removal unit, and sequentially carrying out ionic substance separation treatment and vacuum steam stripping to obtain purified amine liquid I and amine-containing waste liquid; (2) introducing the amine-containing waste liquid into an amine adsorption unit for resin adsorption treatment to obtain deaminated waste liquid; (3) introducing the deaminated waste liquid into a solution crystallization unit for solution crystallization to obtain a condensate and a solid salt; and (4) circulating the condensate back to the amine adsorption unit, and obtaining purified amine liquid I from an outlet of the amine adsorption unit. According to the technical scheme provided by the invention, deep purification of the amine liquid and zero discharge of waste liquid are realized, different types of thermally stable salts and molecular state pollutants can be efficiently removed, the removal rate is improved, and the problem of insufficient purification depth of the amine liquid in the prior art is solved.

The invention provides a pulullan refining method, which belongs to the technical field of biology, and specifically comprises the following steps: fermenting a microbial strain for producing pulullan to obtain fermentation liquor, and sterilizing and decoloring the fermentation liquor to obtain a crude pure extracting solution; carrying out a membrane process and a resin process on the obtained crude pure extracting solution to obtain a refined pure solution; the pore diameter of the membrane material is 500-1000Da; according to the method disclosed by the invention, it is found for the first time that the pullulan is extracted and purified by using a small-aperture nanofiltration membrane and is matched with resin adsorption, so that the purification effect can be achieved, the purity of the product is improved, and the yield of the product is also obviously improved.

The invention relates to a preparation method and application of modified resin for adsorbing gallium in an acid system, belongs to the technical field of separation and extraction of rare metals, and solves one of the problems of small resin adsorption capacity, poor selectivity and the like in the existing gallium extraction process of a resin adsorption method. Comprising the following steps: cleaning substrate resin which is macroporous resin with weakly alkaline active sites; mixing the cleaned substrate resin and the modifier aqueous solution to obtain a mixed solution, introducing inert gas into a reaction container, adding an initiator into the mixed solution, stirring to carry out a grafting reaction, continuously introducing the inert gas during the reaction, and carrying out solid-liquid separation after the reaction is ended to obtain wet modified resin; and carrying out washing, suction filtration and vacuum drying on the wet modified resin to obtain the finished product modified resin. The total exchange capacity of the resin and the selective adsorption capacity of gallium ions are improved. The modified resin prepared by the method has large adsorption capacity on gallium in an acid system.

The invention belongs to the technical field of hydrochloric acid recovery, and discloses a benzene chlorination process byproduct hydrochloric acid impurity removal refining system and method.The method comprises the steps that sodium sulfite is added into hydrochloric acid to remove free chlorine, organic matter in hydrochloric acid is adsorbed through polystyrene-based macroporous resin, iron ions are adsorbed through amino-containing ion exchange resin, and the hydrochloric acid is recycled; hydrochloric acid is fed into a desorption tower for heating desorption, obtained pure hydrogen chloride gas is fed into an absorption tower for secondary absorption, and absorbed water is ultrapure water. According to the method, a combined process of resin adsorption and hydrogen chloride desorption and reabsorption is adopted, volatile impurities are firstly removed, then non-volatile inorganic impurities are deeply adsorbed, the labor division is clear, the efficiency is high, the final product is clear and transparent, the quality is stable, the economic benefit is remarkable, low-value and difficult-to-treat waste acid is converted into high-value commodity hydrochloric acid, waste is turned into wealth, and the method is suitable for industrial production. And remarkable economic benefits are created, and the environmental protection pressure is reduced.

This invention discloses a method for separating bismuth from waste bismuth telluride thermoelectric materials, belonging to the field of separation and purification technology. The method utilizes a macroporous, weakly basic styrene-based anion exchange resin containing tertiary amines to adsorb bismuth, followed by stepwise elution of the adsorbed resin with an eluent to separate bismuth from the bismuth telluride leachate, yielding a high-concentration bismuth-containing solution. The method disclosed in this invention features high selectivity, mild reaction conditions, simple operation, good recycling performance, and minimal environmental pollution. It can solve the environmental hazards caused by the accumulation of waste bismuth telluride thermoelectric materials and also realize the recycling of scarce metal resources such as bismuth, antimony, tellurium, and selenium, alleviating resource scarcity.

The utility model discloses an efficient waste gas treatment vertical tank device based on resin particles, which comprises a stainless steel vertical tank, an exhaust pipe is fixedly mounted at the top of the stainless steel vertical tank, a waste gas pipe is fixedly mounted on the left side of the stainless steel vertical tank, and three mounting rings are fixedly mounted in the stainless steel vertical tank. The three installation rings are located between an exhaust pipe and a waste gas pipe, annular flow guide grid plates are fixedly installed on the three installation rings through bolts, recovery hoppers are inserted into the two annular flow guide grid plates at the bottom in a penetrating mode, a condensation recovery pipe is fixedly installed at the bottom of the stainless steel vertical tank, and a high-temperature steam pipe is arranged on the right side of the stainless steel vertical tank. According to the utility model, harmful substances are adsorbed by the resin adsorption layer, and after multi-layer adsorption treatment, waste gas reaches the standard and is exhausted through the exhaust pipe, so that a resin adsorption filtration and regeneration system is formed, peculiar smell, harmful substances and organic matters in the waste gas can be efficiently adsorbed and removed, and the treatment effect of the waste gas is ensured.

The application provides an electrolytic refining device for high-purity copper and a preparation method of high-purity copper and relates to the technical field of non-ferrous metal metallurgy. The electrolytic refining device comprises an electrolytic refining tank, an electrolyte circulating pump and a deep impurity removal and purification unit; the deep impurity removal and purification unit is arranged on an electrolyte circulating loop of the electrolytic refining tank; and the deep impurity removal and purification unit comprises a chlorination silver removal system, an activated carbon adsorption system and a resin adsorption system which are connected in series along the flow direction of the electrolyte. The device couples the electrolytic tank with the chlorination silver removal system, the activated carbon adsorption system and the resin adsorption system which are connected in series through closed loop circulation, realizes online continuous purification of the electrolyte in the full time domain, overcomes the concentration fluctuation caused by traditional offline intermittent purification, removes the co-deposited metal ions, floating substances and colloidal impurities in stages, completely eliminates the risk of cathode nodulation and can efficiently electrolyze the compact high-purity copper material in one step.

The application provides a 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide production wastewater treatment method and belongs to the field of DOPO wastewater treatment.The 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide production wastewater treatment method is composed of the following steps: resin adsorption, three-effect advection evaporation, oxidative degradation and flocculation precipitation.The 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide production wastewater treatment method can recover HPPA and its structural analogues in the DOPO production wastewater, effectively avoid the adverse effects of HPPA and its structural analogues in the production wastewater on the production wastewater treatment effect, and realize efficient and stable treatment of the 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide production wastewater.

The invention relates to the technical field of biological pharmacy, in particular to a teicoplanin crystallization method. The method comprises the following steps: S1, adsorbing and desorbing a teicoplanin fermentation filtrate through macroporous adsorption resin, and then concentrating and removing ethanol to obtain a desorbed concentrated solution; s2, adding ethanol into the desorbed concentrated solution to obtain a mixed solution; and adjusting the pH value of the mixed solution to 4.0-6.0 by using diluted hydrochloric acid, and cooling and crystallizing to obtain crystal powder. According to the method, crystal powder is formed through proper compression volume in S1 and specific ethanol degree, pH and cooling temperature in a mixed solution in S2. The method has a good decolorization effect without using activated carbon, reduces the use of acetone, and has the advantages of high yield, good impurity removal effect and good decolorization effect.

The application discloses a kind of wastewater comprehensive treatment equipment based on resin and membrane treatment, including processing jar, processing jar is hollow column, processing jar is provided with closed top cover, closed top cover is connected with inlet pipe, it is characterized in that, processing jar is processing cavity, the bottom of processing jar is provided with outlet pipe;Matrix arrangement is used to process jar to process batch water, and the water after pretreatment is treated by resin and membrane structure, and harmful ions are effectively filtered out, resin adsorption structure and membrane treatment structure of coaxial structure are built-in processing jar, and the osmotic pressure on one side of membrane structure treatment is increased by centrifugal force, on the one hand, the processing efficiency and effect are improved, on the other hand, through integrated structure, the effect of facilitating disassembly and assembly is achieved, and synchronous maintenance cycle is realized.

The invention discloses a thallium removal process for wastewater generated in lithium carbonate production from lepidolite, and belongs to the technical field of heavy metal wastewater treatment. The process comprises the following steps: filtering the thallium-containing wastewater, removing impurities, adjusting the pH value, adding a hydrogen peroxide solution and a catalyst to oxidize monovalent thallium into trivalent thallium, adjusting the pH value after the oxidation is finished, carrying out a precipitation reaction, finally filtering, and adding resin for adsorption to obtain the thallium-removed wastewater. According to the method, the defects of a traditional process are overcome, the thallium-containing wastewater from various different source processes can be deeply removed, the thallium content in the treated wastewater does not exceed 1 microgram / L, the total removal rate of thallium reaches 99.99%, the higher-standard discharge requirement is met, and the stability is excellent.

The invention discloses a method for green preparation of high-purity ammonium paratungstate from tungsten ore, and relates to the technical field of tungsten smelting, and the method comprises the working procedures of tungsten ore pretreatment, green ammoniacal decomposition, deep purification of ionic liquid, ultrasonic-assisted cooling crystallization, mother liquor recycling and ammonium paratungstate drying. Reacting with an ammonium carbonate-ammonia water mixed leaching agent, and breaking tungsten ore crystal lattices through a weakly alkaline system to dissolve out the tungsten element; the method comprises the following steps: extracting and purifying a crude ammonium tungstate solution by using a functionalized phosphate-based ionic liquid, and selectively removing impurities; cooling and crystallizing the purified solution under the regulation and control of an ultrasonic field, and inducing growth by combining with a nanocrystalline seed; the crystallization mother liquor is subjected to reduced pressure ammonia distillation, carbonization reaction and resin adsorption to realize recycling of ammonia, ammonium carbonate and residual tungsten; and finally, carrying out segmented drying to obtain a high-purity ammonium paratungstate product.

The invention discloses a method for preparing low-acidity ethyl acetoacetate based on continuous separation, and belongs to the field of chemical engineering. According to the method, a part of low-boiling-point acetic acid is removed by controlling the return material ratio and the discharging amount of the ethyl acetoacetate crude product in the rectification process, and then the ethyl acetoacetate finished product is prepared according to the proper return material ratio and the proper discharging amount; and carrying out deacidification treatment on the ethyl acetoacetate finished product through the resin transformed by the alkali liquor to obtain the low-acidity ethyl acetoacetate. The acidity of the low-acidity ethyl acetoacetate prepared by the method is controlled below 0.01%, and the adopted resin is high in adsorption capacity and can be recycled.

The invention discloses a method for efficiently leaching platinum group metal in a waste automobile catalyst, and belongs to the field of rare and precious metal smelting. The method comprises the following steps: a leaching process: mixing the hulled waste automobile catalyst with a leaching agent, carrying out acid leaching in an acidic solution for a period of time, adding a complexing agent to complex platinum group metals, leaching for a period of time, and filtering to obtain a pregnant solution rich in the platinum group metals and carrier residues; wherein the leaching agent is a cerium-containing compound; a resin adsorption process: adsorbing the pregnant solution through an adsorption column filled with adsorption resin to obtain an adsorbed solution; and an elution process: washing the adsorbed adsorption resin with water and eluting the platinum group metal step by step, and regenerating the eluted adsorption resin for cyclic utilization. The method aims at avoiding generation of toxic and harmful substances (chlorine and NOx) and use of highly toxic cyanide in an existing wet process, environmental pollution and potential safety hazards are fundamentally eliminated, and meanwhile the leaching efficiency of the platinum group metal is remarkably improved.