363 results about "Polymeric adsorbent" patented technology

The present application relates to wastewater treatment technical field, specifically to a kind of ammonia nitrogen wastewater treatment method, the composite modified zeolite material in the present application has excellent physical adsorption capacity to ammonia nitrogen by virtue of its unique pore structure and surface properties, ammonia nitrogen molecules in wastewater can be quickly captured, then through the synergistic effect of composite photocatalyst under light and ultrasonic, strong oxidizing free radicals are generated, ammonia nitrogen molecules not completely adsorbed by zeolite material are deeply degraded, through the synergistic effect of adsorption and photocatalysis, the removal efficiency of ammonia nitrogen is significantly improved;After adsorption and photocatalytic treatment, the ammonia nitrogen concentration in wastewater has been greatly reduced, and resin adsorption treatment is used as a subsequent step, which can selectively adsorb residual trace amounts of ammonia nitrogen and other impurities, thereby realizing deep purification of wastewater and ensuring that the effluent quality meets or exceeds relevant discharge standards.

The utility model provides a deep defluorination device for aluminum resin, which is characterized by comprising a first-stage defluorination device, a second-stage defluorination device, a third-stage defluorination device and a solution callback device, the primary defluorination device comprises a first dosing tank, a first regulating tank, a first flocculation tank and a first sedimentation tank; the secondary defluorination device comprises a second dosing tank, a second regulating tank, a second flocculation tank and a second sedimentation tank; the three-stage defluorination device comprises a resin adsorption column; and the solution callback device comprises a third regulating tank, a third flocculation tank and a third sedimentation tank. According to the utility model, the fluorine content in the wastewater is stably and deeply removed, the increasingly strict discharge standard is met, the resource utilization efficiency is obviously improved, the overall cost of wastewater treatment is reduced, and an efficient, economical and environment-friendly new scheme is provided for the field of industrial wastewater treatment.

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 present invention relates to the technical field of antibiotic production, and in particular to a dalbavancin intermediate A40926 and a separation and purification method thereof, comprising the following steps: S1, filtering a fermentation broth containing the dalbavancin intermediate A40926 to obtain a collected liquid; S2, adsorbing the collected liquid through a macroporous adsorption resin, eluting with ethanol, and collecting an eluate a having an A40926 unit greater than 100 mg / L; S3, ultrafiltrating and concentrating the eluate a to obtain a concentrated liquid having an A40926 unit of 15,000 to 16,000 mg / L; S4, subjecting the concentrated liquid to a chromatography exchange resin, top-washing with pure water, and gradient eluting with an ammonium acetate-ethanol solution, to collect an eluate b having an A40926 purity greater than 95%; S5, adjusting the pH of the eluate b to 8.0±0.2, adding acetone, adjusting the feed liquid temperature to 2 to 8°C, stirring for 6 to 7 hours, performing crystallization, and filtering and drying to obtain the dalbavancin intermediate A40926.

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 relates to the technical field of non-ferrous metal hydrometallurgy, in particular to a method for separating molybdenum and rhenium from molybdenum smelting waste acid by using resin, which comprises the following steps: adding a phosphorus source into the molybdenum smelting waste acid, and then adjusting the acidity to an acid environment in which the hydrogen ion concentration is greater than or equal to 1mol / L; molybdenum and rhenium in the molybdenum smelting waste acid with the acidity adjusted are separated through weak-base anion exchange resin, and a rhenium product with the lower molybdenum impurity content is obtained. According to the method, the phosphorus source is added into the molybdenum smelting waste acid, so that phosphate ions are hydrolyzed from the phosphorus source, molybdenum can be effectively prevented from being adsorbed by the alkalescent anion exchange resin, the selectivity of the anion exchange resin to rhenium is greatly improved, and the rhenium recovery rate and the molybdenum-rhenium separation effect are improved; the problems that in the prior art, ion exchange resin is difficult to adapt to molybdenum-rhenium separation under the high molybdenum concentration, the rhenium recovery rate is low, the rhenium-molybdenum separation effect is poor, and a high-molybdenum-concentration solution cannot be treated are solved.

The invention discloses a method for extracting ecdysterone from cyanotis arachnoidea by using a deep-eutectic solvent, and belongs to the technical field of ecdysterone extraction. The method comprises the following steps: mixing a deep-eutectic solvent which takes choline chloride and a hydrogen bond donor material as raw materials with water, extracting ecdysterone in roots and stems of Cyanotis arachnoidea to obtain an ecdysterone crude extract, precipitating the ecdysterone crude extract by adding water, filtering, and adsorbing ecdysterone by using macroporous resin. Adding water for elution to obtain a deep-eutectic solvent-water mixed solution, and recovering under reduced pressure to obtain an extraction solvent for cyclic utilization; and eluting by using alcohol with different concentrations to obtain an ecdysterone crude extract, and purifying the crude extract to obtain high-purity ecdysterone. Compared with a conventional extraction method, the process method adopted by the invention has the advantages that the process is simple, efficient, green and environment-friendly, the used eutectic solvent can be recycled, the loss caused by heating volatilization in the extraction process is avoided, the ecdysterone extracted by the method is pure white, the content of ecdysterone can reach 90% or above after simple purification, and the method is suitable for industrial production. After re-purification, the purity of ecdysterone detected by high performance liquid chromatography is up to 98% or above.

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 discloses a process method and a process device for deep treatment of organic waste sulfuric acid, and aims to solve the problems of corrosion, high salt content, poor concentration effect and the like in a high-concentration waste sulfuric acid (the concentration of sulfuric acid is 30-60%) treatment system, a high-concentration ozone oxidation-ceramic ultrafiltration membrane-resin bed adsorption process is adopted to realize efficient degradation and separation of organic matters in waste acid, and the treatment efficiency is improved. The resource recovery of the waste sulfuric acid is realized; aiming at the problems that solid waste in the sulfuric acid industry has complex salt components (such as sodium salt and ferric salt), the generation amount is large, the absorption treatment is difficult, the economic benefit is poor and the like, an ultrafiltration + nanofiltration + resin adsorption + reverse osmosis pre-concentration-evaporation / waste heat recycling cascade concentration technology is developed, acid wastewater treatment is carried out, and electricity, heat and water integrated energy efficient utilization of the system is realized.

The invention discloses a method for efficiently separating manganese, iron and aluminum in manganese oxide leachate step by step and efficiently recovering manganese, iron and aluminum, which comprises the following steps: by taking manganese dioxide and manganese slag leachate as a raw material, adjusting the acidity pH of the solution to be 1-2, adsorbing and removing iron ions by using resin, then adjusting the pH of the solution to be 2-4, and adsorbing and removing aluminum by using resin. And finally, extracting and separating to obtain a manganese-containing solution. Iron and aluminum on the chelate resin can be desorbed by hydrochloric acid, and the resin can be recycled. According to the method, manganese, iron and aluminum in the manganese oxide residue leaching solution are effectively separated and recycled through combination of ion exchange and an extraction method, manganese ions are selectively separated from the solution, separation of manganese from impurity elements such as aluminum and iron is achieved, the content of the impurity elements such as iron and aluminum in the manganese solution is reduced, damage of a traditional precipitation method to manganese is avoided, and the method is suitable for industrial production. The purity of manganese is integrally improved, and technical support is provided for preparation of high-purity manganese. Meanwhile, iron and aluminum elements in the solution can be effectively recycled.

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 belongs to the technical field of traditional Chinese medicine extraction, and particularly relates to a coptis chinensis extraction process which comprises the following specific steps: coptis chinensis pretreatment: selecting dried coptis chinensis rhizomes, removing impurities and mildewed parts, washing the treated coptis chinensis twice with deionized water, removing surface dust, drying in a drying oven at 50-60 DEG C until the water content is less than 5%, and taking out the coptis chinensis; the dried coptis chinensis is smashed through a smashing device, the smashed coptis chinensis is sieved through a 80-100-mesh sieve, and uniform fine powder is obtained.In the coptis chinensis extraction technology, interference of fat-soluble impurities is reduced through degreasing pretreatment, the subsequent resin adsorption efficiency is improved, pigment and polar impurities can be selectively adsorbed through decoloration of resin, effective ingredients such as alkaloid can be reserved, and the extraction efficiency of coptis chinensis is improved; small molecular impurities can be accurately removed through a membrane separation technology, traditional activated carbon adsorption is replaced, loss of effective components is reduced, finally, efficient separation and purification are conducted through an acid-base precipitation method, and water-soluble impurities are synchronously removed.

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 invention discloses preparation of phenolic chelating resin and application of the phenolic chelating resin in deep defluorination, belongs to the field of water treatment adsorption materials, and particularly relates to a resin adsorbent with a phenolic polycondensation framework, an amino phosphonic acid chelating functional group and a metal coordination center. The structural unit of the resin adsorbent is shown in the figure. The phenolic chelate resin is suitable for a deep fluorine removal process with complex wastewater components, and specific adsorption of F <-> is achieved by loading metal cations (M) such as aluminum, iron, zirconium, lanthanum and cerium. The phenolic chelate resin provided by the invention has a highly hydrophilic skeleton and a uniform mesoporous structure (2-50nm), has good dynamic performance, low affinity to organic matters, strong anti-pollution ability, high adsorption capacity and F-selectivity, and can effectively improve the process operation efficiency and reduce the resin regeneration cost.

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 discloses a cyanuric acid wastewater resource utilization treatment method, and relates to the technical field of organic wastewater treatment.The cyanuric acid wastewater resource utilization treatment method is characterized by comprising the steps that the pH value and salt concentration of cyanuric acid-containing wastewater are adjusted, a precipitation reaction is performed at normal temperature till solid-liquid separation is performed, clear liquid and sodium cyanurate filter residues are obtained, and the sodium cyanurate filter residues are recycled; and carrying out suction filtration treatment on the clear liquid by using special resin to obtain suction filtration produced water, and treating the special resin subjected to suction filtration treatment by using regenerated liquid flow to obtain regenerated waste liquid and recycling the regenerated waste liquid. The method has the effects that sodium cyanurate is efficiently recycled, and a high-salt matrix is synchronously constructed to directly meet the requirements of ionic membrane raw materials; the special resin is high in adsorption capacity and regeneration efficiency, and regenerated waste liquid is recycled; the total nitrogen removal rate and the TOC removal rate are high after deep treatment of the electro-catalysis process, and the energy consumption is remarkably reduced compared with that of a traditional process; the resource utilization treatment method is free of secondary pollution, and the treatment cost is remarkably reduced compared with that of a traditional process.

The invention discloses an energy-saving and efficient electroplating nickel-copper-containing wastewater treatment device, relates to the technical field of wastewater treatment, and aims to solve the problem that the adsorption efficiency is influenced by local loss caused by non-uniform particle size distribution of resin in a resin adsorption process. On one hand, automatic compaction of resin particles under the pressure difference is realized by the compaction moving assemblies which are arranged in the adsorption tank body and the exchange column in parallel, and the purpose of adsorbing and purifying the electroplating nickel-copper-containing wastewater and forming tight contact between the resin particles and achieving uniform particle size distribution is achieved; the resin particles can complete adsorption replacement from the whole to local concentration in the adsorption treatment process, and continuous collection and supplement of the invalid resin particles are realized; and under the combination of the two, the resin particles are automatically replaced and supplemented under the non-stop state, so that the sealing operation reliability in the electroplating nickel-copper-containing wastewater treatment process is achieved, and the adsorption efficiency is improved.

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.

The invention discloses a high-purity tea polyphenol extraction method, which comprises: S1, mixing a tea leaf raw material with deionized water, and carrying out shearing dispersion to obtain a solid-liquid homogeneous mixture; s2, performing water extraction on the solid-liquid homogenized mixture to obtain a water extract, and filtering the water extract to obtain filter residues and filtrate; s3, the filtrate is subjected to activated carbon adsorption, precision filtration and concentration, and tea polyphenol concentrated extract liquor is obtained; s4, mixing the tea polyphenol concentrated extract with an organic solvent for extraction to obtain an organic solvent phase and a water phase in which the tea polyphenol is located; and S5, adsorbing the water phase through a resin adsorption column, and drying to obtain the tea polyphenol. The invention further provides extraction equipment for the extraction method of the high-purity tea polyphenol. The tea polyphenols extracted by the extraction method and the extraction equipment of the high-purity tea polyphenols have the advantages of being continuous, efficient, small in organic solvent dosage, low in harmful trace substance content, low in production cost and the like.

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 relates to the technical field of purification of beta-alanine, and discloses a method for separating and purifying beta-alanine from fermentation liquor. The invention provides a method for separating and purifying beta-alanine from fermentation liquor by combining flocculation and resin to overcome the defects that an existing process for separating and purifying beta-alanine from fermentation liquor is tedious in route, high in cost and technology, large in energy consumption and the like. Impurity substances can be effectively removed through the steps of flocculation impurity removal, protein removal, resin adsorption decoloration, resin adsorption elution refining and crystallization extraction of beta-alanine, and the obtained product is high in purity. Meanwhile, the method is simple to operate, mild in process condition and low in cost.

The invention provides a method for treating production wastewater of 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and belongs to the field of DOPO (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) wastewater treatment. The method for treating the production wastewater of the 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide comprises the following steps: resin adsorption, triple-effect advection evaporation, oxidative degradation and flocculent precipitation. According to the 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide production wastewater treatment method, HPPA and structural analogues thereof in DOPO production wastewater can be recycled in a targeted manner, adverse effects of HPPA and structural analogues thereof in the production wastewater on the treatment effect of the production wastewater are effectively avoided, and treatment of 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide production wastewater is realized. The method can be used for efficiently and stably treating the production wastewater of the 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide.

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 present invention belongs to the field of food testing technology and provides a method for evaluating the debittering effect of citrus juice by resin adsorption. The method comprises the following steps: adding a sucrose ester emulsifier solution to a naringin solution, measuring the initial and final interfacial tension values, and obtaining the interfacial tension difference; adding the sucrose ester emulsifier solution during the citrus juice preparation process, and then debittering the citrus juice by resin adsorption to obtain the debittered citrus juice; and using the interfacial tension difference of the naringin solution containing the sucrose ester emulsifier as an indicator to determine the debittering effect of the citrus juice by resin adsorption. The present invention evaluates the debittering effect of citrus juice by resin adsorption by measuring the interfacial tension difference of the naringin solution containing the sucrose ester emulsifier. This evaluation method has the advantages of strong anti-interference ability, avoids interference from components such as pectin and pigments, excellent data reproducibility, and low reagent consumption.