48 results about "Acid oxidation" patented technology

The invention discloses a microbial soil conditioner and a preparation method thereof, and relates to the technical field of soil improvement. The method comprises the following steps: culturing heavy metal-resistant chlorella and aspergillus niger to obtain a mixed bacterial suspension, combining the mixed bacterial suspension with a composite chelating modifier prepared by reacting chitosan quaternary ammonium salt, ethylenediamine tetraacetic acid and epichlorohydrin, carrying out crosslinking by using genipin to obtain a functional microbial agent, and carrying out pyrolysis and acid oxidation on corn straws as a raw material to obtain the heavy metal-resistant chlorella modified functional microbial agent. The preparation method comprises the following steps: preparing a nano zero-valent iron-biochar composite material, reducing and loading ferrous ions through sodium borohydride, preparing the nano zero-valent iron-biochar composite material, mixing the nano zero-valent iron-biochar composite material with zeolite, bentonite and a silane coupling agent, carrying out spray drying to prepare a porous carrier substance, and finally stirring and mixing an organic fertilizer complex microbial inoculant, the functional microbial inoculant and the carrier substance, and aging to prepare the soil conditioner. The prepared conditioner has a good remediation effect on soil heavy metal pollution.

The invention discloses a method for preparing epsilon-caprolactone by a peroxy acid oxidation method, and relates to the field of organic chemical synthesis. The method specifically comprises the following steps: preparation of peroxy acid, Baeyer-Villiger oxidation reaction of peroxy acid and cyclohexanone, and separation and purification of a product. Peroxy acid generated by organic acid and hydrogen peroxide is used as an oxidizing agent, and a metering pump is adopted to accurately control the raw material proportion. The method has the advantages of simplicity and convenience in operation, mild reaction conditions and high yield, and is suitable for industrial production.

The application discloses an automatic control method for oxidation flocculation parameters in mancozeb wastewater treatment, and belongs to the technical field of industrial wastewater treatment and automatic control. In view of the problem that the existing process relies on manual experience and the oxidation and flocculation stages are improperly connected, the multifunctional modified material containing dithiocarbamate salt groups, quinone groups and pre-complexed manganese and zinc ions is prepared first; the material and hydrogen peroxide are synchronously added in the acid oxidation stage, and the control system monitors the redox potential change rate in real time; when the redox potential reaches the preset threshold value and the characteristic change point with the first derivative of zero or the change from positive to negative appears and is maintained for the preset maintenance time, the system is automatically adjusted to be alkaline, the modified material triggers the net capture and chelation crosslinking reaction, and finally solid-liquid separation is carried out; the polymer skeleton is protected from indiscriminate attack of free radicals, the problem of drug antagonism is overcome, and the stable and up-to-standard effluent quality is realized.

The invention discloses application of bismuth vanadium tetraoxide as a photocatalyst in preparation of allantoin. According to the method, a decahedral single crystal micron material bismuth vanadium tetroxide is used as a photocatalyst, uric acid is used as a substrate, a photocatalytic reaction is performed under the irradiation of visible light, and uric acid is oxidized, hydrolyzed, decarboxylated and converted into allantoin; compared with a traditional chemical synthesis method, the method has the advantages that the bismuth vanadium tetraoxide serves as a photocatalyst, uric acid is converted into allantoin through photocatalytic reaction, selective activation of chemical bonds is achieved through directional regulation and control of photo-induced electron-hole pairs, and the method is mild in reaction condition, low in energy consumption and the like.

The invention discloses a method for treating COD (Chemical Oxygen Demand) in acetophenone-containing waste acid, and relates to the technical field of waste acid treatment. The method for treating the COD in the acetophenone-containing waste acid comprises the following steps: S1, pretreating the acetophenone-containing waste acid; s2, carrying out oxidation reaction on the purified acetophenone-containing waste acid, and carrying out gas-liquid separation to obtain acetophenone-containing waste acid for primary reaction; and S3, adding sodium hypochlorite into the acetophenone-containing waste acid after the primary reaction to carry out secondary oxidation, carrying out gas-liquid separation on the waste acid after the secondary oxidation, and condensing and recycling the waste acid. According to the method, COD is controlled to be efficiently oxidized into CO2 and other gases through cooperation of two times of oxidation, the COD removal rate of acetophenone-containing waste acid can reach 94% at most through absorption and recovery of alkali liquor, and the acetophenone-containing waste acid can be recycled in the product production process.

The invention discloses a synthesis method of a dipyridamole key intermediate. The synthesis method of the dipyridamole key intermediate comprises the following steps: carrying out condensation on 2-nitroethyl acetate and ethyl oxalate, then carrying out condensation with urea, carrying out nitro reduction, then carrying out condensation with urea, carrying out chlorination, and finally carrying out condensation with piperidine so as to prepare the dipyridamole key intermediate 2, 6,-dichloro-4, 8-dipiperidyl-pyrimido [5, 4-d] pyrimidine. According to the method, traditional nitration and nitric acid oxidation processes are avoided, the whole process is free of danger, reaction conditions are mild, and the product yield is high.

The present application relates to the technical field of electrochemical analysis detection, and particularly relates to a treatment method of a graphite electrode. The present application utilizes plasma to treat the graphite electrode, so as to realize that the oxidation peak potential of uric acid is obviously reduced, the uric acid can be oxidized on the surface of the graphite electrode at a lower potential, the oxidation of other reducing substances in blood is avoided, and the anti-interference ability during the uric acid test is improved.

The invention provides a preparation method of a high-performance formic acid electrooxidation platinum-based catalyst, and belongs to the technical field of electrocatalysis. The micromolecule reducing agent assisted wet chemical method provided by the invention can quickly promote dissolution of a metal precursor and inhibit homogeneous nucleation of noble metal, so that a two-dimensional structure is formed, epitaxial growth of the edge of platinum metal is promoted, and the mixed-phase PtTe2 (at) Pt core-shell nanosheet catalyst is obtained. The two-dimensional structure is beneficial for the catalyst to expose more catalytic active sites, and the oxidation reaction of formic acid is accelerated. The design of the core-shell structure enhances the structural stability of the catalyst under an acidic condition. The catalytic coordination effect of different crystal phases enables the reaction path of formic acid oxidation reaction to be adjusted, so that the catalytic performance is improved. The use of the small molecule reducing agent effectively controls the diffusion and aggregation of platinum metal ions, further adjusts the number of active sites of Pt in the platinum tellurium catalyst, and significantly improves the catalytic performance of formic acid electro-oxidation reaction (FAOR).

The present invention discloses a method for oxidizing 1,1-bis-(3,4-dimethylphenyl)-alkane with nitric acid in a pressure vessel to produce 3,3',4,4'-benzophenonetetracarboxylic acid and simultaneously form nitric oxide, wherein the nitric oxide is sent from the pressure vessel to an absorption vessel, and the nitric oxide in the absorption vessel reacts with molecular oxygen and water to generate an aqueous nitric acid solution, thereby preventing the emission of nitric oxide and avoiding the risk of oxygen inhibiting the oxidation of nitric acid. Furthermore, when the nitric acid from the absorption vessel is used to oxidize the 1,1-bis-(3,4-dimethylphenyl)-alkane, the consumption of nitric acid is reduced.

The invention provides a method for comprehensively recovering selenium, tellurium, mercury, silver and lead from lead smelting acid mud, and belongs to the technical field of hazardous solid waste harmlessness and comprehensive resource recovery, and the method comprises the following steps: mixing the lead smelting acid mud, an activating agent and water, ball-milling and activating to obtain activated acid mud; carrying out low-acid oxidation leaching on the activated acid mud to obtain low-acid leaching liquid and low-acid leaching residues; carrying out high-acid oxidation leaching on the low-acid leaching residues to obtain high-acid leaching liquid; bismuth powder is added into the low-acid leaching liquid for tellurium enrichment reaction, and tellurium concentrate and tellurium enriched liquid are obtained; adding chlorine salt into the tellurium-enriched liquid, and reacting under a certain pH value to obtain bismuth oxychloride and bismuth-removed liquid; carrying out mercury enrichment on the bismuth removal liquid to obtain mercury-rich slag and mercury removal liquid; and adding a reducing agent into the mercury removal liquid to react to obtain crude selenium and reduced liquid. The method for comprehensively recovering selenium, tellurium, mercury, silver and lead from lead smelting acid mud provided by the invention is economical, efficient and environment-friendly, and can solve the problems that the acid mud containing elements such as selenium, tellurium, mercury, silver and lead is stockpiled, all valuable elements cannot be recovered, and the like.

The application belongs to the field of industrial catalysis, and particularly relates to a method for synthesizing 2-keto acid by alternation magnetic field assisted Fe3N catalytic oxidation of 2-hydroxy acid, wherein 2-hydroxy acid of formula 1 ( ), an oxidizing agent and Fe3N are mixed and catalytic oxidation is carried out under the assistance of an alternation magnetic field to obtain 2-keto acid of formula 2 ( ). The application innovatively finds that the alternation magnetic field assisted Fe3N catalytic oxidation of 2-hydroxy acid can cyclically synthesize 2-keto acid with high selectivity and high stability under mild conditions; thus, the industrial amplification production of 2-keto acid can be facilitated.

The utility model belongs to the technical field of chemical equipment, and particularly relates to an acrylic acid oxidation device. The acrylic acid oxidation device comprises a propylene evaporator, a first oxidation reactor, a second oxidation reactor and a quenching absorption tower, the propylene evaporator is connected with a mixer a, the mixer a is connected with the first oxidation reactor, the first oxidation reactor is connected with a mixer c, and the mixer c is connected with the second oxidation reactor. The second oxidation reactor is connected with a quenching absorption tower, the first oxidation reactor is connected with a heat exchanger a through a fused salt circulating pump, the heat exchanger a is connected with a high-pressure steam buffer tank, the second oxidation reactor is connected with a heat exchanger d through a heat medium oil circulating pump, and the heat exchanger d is connected with the high-pressure steam buffer tank. According to the acrylic acid oxidation device provided by the utility model, the yield and the purity of acrylic acid can be improved, and meanwhile, energy consumption and environmental pollution are reduced.

The invention discloses a method for synthesizing 2-Cl-3-nitrobenzoic acid through nitric acid oxidation, and relates to the technical field of chemical synthesis. The method comprises the following steps: adding 2-Cl-3-nitrotoluene, an oxidant and a catalyst into a pressure-resistant reaction bottle, and reacting at 120-140 DEG C to obtain a 2-Cl-3-nitrobenzoic acid solution; adding water and ethyl acetate into the obtained 2-Cl-3-nitrobenzoic acid mixed solution for extraction and separation, separating out an organic phase, adding an alkaline solution into the organic phase, converting 2-Cl-3-nitrobenzoic acid into 2-Cl-3-sodium nitrobenzoate, and separating out a water phase, adding an acidic solution into the water phase to convert the 2-Cl-3-nitrobenzoic acid into 2-Cl-3-nitrobenzoic acid, adding ethyl acetate to extract and separate out an organic phase, and concentrating the organic phase under reduced pressure to obtain a 2-Cl-3-nitrobenzoic acid solid. The raw materials are cheap and easy to obtain, the reaction process is easy to control, the product purity and yield are high, the amount of generated waste water is small, the waste water is easy to treat, and high economic and environment-friendly benefits are achieved.

The invention relates to a method for synthesizing 5-methylpyrazine-2-formic acid-4-oxide through microchannel continuous flow, and belongs to the technical field of pharmaceutical chemistry and chemical process strengthening. According to the method, 5-methylpyrazine-2-carboxylic acid and hydrogen peroxide are used as raw materials, phosphoric acid, an inorganic salt catalyst and a small amount of hydrogen peroxide stabilizer are used as a catalytic system, water is used as a solvent, a phosphoric acid-inorganic salt catalyst synergistic catalytic system is constructed, and a pH differential feeding method is adopted, so that the reaction rate, selectivity and safety are synchronously improved; the invention relates to a process technology for preparing 5-methylpyrazine-2-formic acid-4-oxide in a continuous flow microchannel reactor. The method has the advantages of mild reaction conditions, short reaction time and high raw material utilization rate, can realize effective control in the reaction process, and provides a new method for safe production of 5-methylpyrazine-2-formic acid-4-oxide.

The application discloses a kind of waste acid oxidation-reduction potential detection guarantee method and device, waste acid from sulfidation reactor is respectively transported to cyclone and desorption tower by waste acid delivery pump through pipeline;Waste acid transported to cyclone enters cyclone along tangent direction, then by the outlet at the top of cyclone spirally rises into ORP flow cell;Low solid content waste acid contacts detection probe, and rotating scouring detection probe slows down solid aggregation on probe coating, then from the third waste acid outlet of side wall flows into desorption tower;Waste acid from cyclone and ORP flow cell converges after waste acid in desorption tower, and is transported to thickener processing by waste acid supply pump.The application process is simple, can effectively improve process operating environment, has good environmental protection benefit, ensures enterprise safety production, solves the detection precision problem of waste acid oxidation-reduction potential detection probe.

The invention discloses a method for synthesizing 2-F-3-nitrobenzoic acid through nitric acid oxidation, and relates to the technical field of chemical synthesis. The method comprises the following steps: dissolving ammonium molybdate, adding ferric nitrate to prepare a catalyst, adjusting the pH to be acidic, and reacting for 3 hours to obtain a purified solid catalyst; then, the 2-F-3-nitrotoluene, an oxidizing agent and a catalyst are subjected to a reaction at the temperature of 130-150 DEG C, and a 2-F-3-nitrobenzoic acid solution is generated. And carrying out ethyl acetate extraction, acid-base conversion, extraction and vacuum concentration to finally obtain a high-purity 2-F-3-nitrobenzoic acid solid. According to the method, raw materials are easy to obtain, reaction is easy to control, product purity and yield are high, less wastewater is generated, treatment is simple, and economic and environment-friendly benefits are achieved.

The invention belongs to the field of electrolytic baths, and particularly relates to a cathode catalyst for constructing an acid reaction microenvironment, a preparation method and application of the cathode catalyst, an electrolytic bath and a method for producing hydrogen by electrolyzing non-pure water. The preparation method of the cathode catalyst comprises the following steps: preparing a # imgabs0 # acid oxide precursor into a solution; dispersing a Pt / C catalyst into the solution; heating and slowly evaporating to obtain a solid, and drying to obtain a precursor (at) Pt / C; and in a tubular furnace, annealing the precursor (at) Pt / C to obtain a cathode catalyst acid oxide (at) Pt / C. The invention provides a microenvironment pH adjusting strategy, # imgabs1 # acid oxide is introduced into Pt / C to prepare a cathode catalyst, an electrolytic bath prepared by adopting the catalyst is applied to water electrolysis hydrogen production, and a strong acid local environment can be constructed, so that the hydrogen production reaction kinetics is improved; the deposition / precipitation of cations at the cathode is inhibited; the chemical degradation of the proton exchange membrane is delayed.

The invention belongs to the technical field of nano powder materials, and particularly relates to zirconium carbide powder and a preparation process thereof. The preparation method comprises the following steps: preparing carbon quantum dots by taking waste activated carbon as a carbon source through the steps of acid oxidation, alkali treatment, high-temperature hydrothermal passivation and the like, preparing zirconium quantum dots by taking sodium borohydride and zirconium oxychloride as raw materials through a water-phase chemical reduction method, mixing the carbon quantum dots and the zirconium quantum dots with nano sizes, and then performing Joule heating high-temperature treatment. Zirconium carbide powder is obtained within an extremely short time, it is guaranteed that the zirconium carbide powder has high purity, the particle size of the powder is reduced, and the specific surface area is increased.

The application belongs to the field of antimicrobial materials, and discloses an antibacterial bioactive coating and a preparation method thereof. The application converts β-cyclodextrin into a dialdehyde derivative through periodic acid oxidation, and copolymerizes the dialdehyde derivative with acrylated chitosan under the initiation of ultraviolet light free radicals to prepare an intelligent copolymer which can be specifically cut by β-cyclodextrinase. Natural plant polyphenols are loaded in the copolymer to realize enzyme-triggered precise release and maintain long-acting antibacterial activity. After coating, the solvent is removed, the micropores are closed, and the molecular-level secondary crosslinking is completed in one step under the treatment of supercritical CO2 environment at 35 MPa and 40 DEG C for 2 hours. Traditional high-temperature drying is not needed, internal stress and crack generation are significantly reduced, and the stability of the pores is improved. The final coating has self-repairing, high adhesion and scrub resistance, and the preparation process is environmentally friendly and efficient, and is suitable for the surface long-acting antibacterial protection of medical devices, food packaging and public facilities.

To provide a simple and highly productive method for producing 5-hydroxy-2-adamantanone.SOLUTION: A method for producing 5-hydroxy-2-adamantanone includes oxidizing 2-adamantanone using mixed acid containing sulfuric and nitric acids, wherein the water concentration in the mixed acid is 4.0 mass% or less.SELECTED DRAWING: None

The application discloses a kind of molybdenum bis (dibutyl dithiocarbamate) oxide and preparation method thereof, comprising the following steps: molybdenum trioxide, phase transfer catalyst and water are uniformly mixed, are sent into first-stage mixing reactor, sodium hydrosulfide, sodium thiosulfate and water are uniformly mixed, also are sent into first-stage mixing reactor, and first reaction solution is obtained by reaction;Di-n-butylamine and water are uniformly mixed, are sent into second-stage mixing reactor, carbon disulfide is simultaneously sent, and second reaction solution is obtained by reaction;First reaction solution, second reaction solution are respectively sent into third-stage mixing reactor and are reacted, obtain molybdenum bis (dibutyl dithiocarbamate) oxide solution, solid-liquid separation, drying, obtained immediately.The yield of product obtained by the application is high, the purity is high, the quality is stable, the whole reaction process is continuously carried out in airtight container, there is no gas volatilization, which is conducive to environmental protection, reaction solvent is water, resource consumption is less, can be recycled, clean and environmentally friendly.

This invention discloses a continuous production method for preparing high-purity fulvic acid from coal gangue, comprising the following steps: coal gangue pretreatment, weak acid oxidation reaction, continuous screw conveying reaction, pre-membrane chelation, ultrafiltration purification, and concentration and collection. The method utilizes crushing, magnetic separation, and flotation to pre-remove impurities from the raw materials. A weak acid oxidation system with a molar ratio of HClO and CA of 1:0.2-0.5 is employed for mild pyrolysis and heavy metal pre-chelation. Continuous conveying and mixing are achieved using a co-rotating twin-screw extruder with an aspect ratio of 40-50. The final product is obtained through vacuum concentration after pre-membrane chelation with 0.05-0.5 wt% EDTA and purification via 800 Da ultrafiltration. High-purity fulvic acid is then obtained. This invention achieves continuous production throughout the entire process; heavy metal removal rate ≥99.7%; zero chlorinated byproduct generation; 89% reduction in hazardous waste generation; and closed-loop utilization of water resources. It solves the problems of low efficiency, poor product quality, and high environmental pressure associated with existing intermittent production technologies, enabling high-value utilization of coal gangue solid waste and is suitable for large-scale production.

The invention discloses a long-chain platinoid nano-bead material and application thereof. According to the preparation method, Pt salt and Cu salt are taken as metal precursors, CTAC (cetyltrimethylammonium chloride) is taken as a surfactant, 1-naphthyl acetamide is taken as a morphology guiding agent, HCHO (formaldehyde) is taken as a reducing agent, PVP (polyvinylpyrrolidone) is taken as a dispersing agent, and the long-chain PtCu nano-beads composed of superfine nano-particles are obtained through one-step hydrothermal treatment. The preparation method is simple and easy to implement, low in cost and simple to operate, and large-scale production can be realized. The long-chain PtCu nano-beads have the advantages of rich active sites, relatively high mass and charge transfer and the like, and have excellent electrocatalytic activity and stability on formic acid oxidation and acidic hydrogen evolution.

The utility model relates to the technical field of gas sampling of acrylic acid oxidation reactors, in particular to a gas sampling device of an acrylic acid oxidation reactor. The gas sampling device of the acrylic acid oxidation reactor comprises a buffer impurity removal tank and an ice water cooler, a first-stage bubbling type gas collection bottle, a second-stage bubbling type gas collection bottle and a third-stage bubbling type gas collection bottle are arranged in the ice water cooler, the buffer impurity removal tank is connected with the first-stage bubbling type gas collection bottle through a gas mass flow controller, and the second-stage bubbling type gas collection bottle is connected with the third-stage bubbling type gas collection bottle through a gas mass flow controller. The first-stage bubbling type gas collecting bottle is connected with the third-stage bubbling type gas collecting bottle through the second-stage bubbling type gas collecting bottle, and the third-stage bubbling type gas collecting bottle is connected with the first-stage gas sampling bag through the gas flowmeter. And the gas flow meter is provided with a temperature display. The device has the characteristics of simple structure, convenience in operation, low cost, accurate analysis data, small influence of external environment and the like.

Disclosed herein is a method of extracting metal from a metal sulfide containing material comprising the steps of: a) providing an aqueous acidic oxidant mixture comprising water, an acid, an oxidising means, and a halide ion source, wherein the aqueous acidic oxidant mixture has a pH of less than 7; wherein the oxidising means comprises hydrogen peroxide, ozone, oxygen, chlorine, bromine, iodine, hypochlorous acid, hypobromous acid, hypoiodous acid, a hypochlorite salt, a hypobromite salt, a hypoiodite salt, a percarbonate salt, a persulfate salt, a permanganate salt, an anode connected to a power source, or combinations thereof; b) contacting the aqueous acidic oxidant mixture with the metal sulfide containing material to extract the metal from the metal sulfide containing material and form a metal halide solution; wherein the metal comprises copper, nickel, lead, zinc, or combinations thereof.

The invention relates to the field of organic synthesis and molecular medicine, in particular to a preparation method of a phenazine derivative electron mediator 1-methoxy-5-methylphenazine methyl sulfate salt (1-methoxyl PMS) and application of the phenazine derivative electron mediator 1-methoxy-5-methylphenazine methyl sulfate salt in the electron mediator and a sensor. According to the synthesis method, o-vanillin is taken as a starting raw material, 1-methoxyphenazine is synthesized through m-chloroperoxybenzoic acid oxidation (a solvent-free system), sodium periodate water-phase oxidation and alkaline aqueous solution coupling in sequence, and then methylation reaction is performed in a tetrahydrofuran solvent to prepare a target product. According to the method, a water / THF dual-phase system is innovatively adopted, a'one-pot method 'oxidative coupling simplified process is adopted, acidification pulping replaces traditional column chromatography purification, and a noble metal catalyst is not needed in the whole process. The total yield reaches 60%, the heavy metal residue of the product is less than 1ppm, the solvent toxicity is reduced by 90%, the reaction condition is mild (room temperature / normal pressure), and a new green manufacturing scheme is provided for localization of the CCK-8 kit.

The invention discloses a method for precipitating iron from wet-process zinc smelting leachate and application of the method, and relates to the technical field of wet-process metallurgy. The invention specifically discloses a method comprising the following steps: carrying out a semi-acid oxidation neutralization iron precipitation reaction on a leaching solution containing zinc sulfate and ferrous sulfate produced by wet-process zinc smelting, an oxidizing agent and a first neutralizer in a reactor; the mass ratio of zinc in the first neutralizer to iron in the hematite slag obtained by iron precipitation is (0.4-0.6): 1; the iron precipitation reaction contains at least five stages of sub-reactions; the dosage of the neutralizer in the first-stage sub-reaction, the dosage of the neutralizer in the second-stage sub-reaction, the third-stage sub-reaction, the fourth-stage sub-reaction and the fifth-stage sub-reaction is 20wt%-35wt%, 55wt%-70wt% and 5wt%-10wt% of the dosage of all the neutralizers respectively. By means of the method, reduction control over sulfur in the iron slag produced in the iron precipitation process can be effectively achieved.

The utility model provides a double-seal structure for a large flange of nitric acid oxidation furnace equipment, which comprises an upper cylinder and a lower cylinder, an upper flange is arranged at one end of the upper cylinder facing the lower cylinder, and a lower flange matched with the upper flange is arranged on the lower cylinder; the end, facing the lower flange, of the upper flange is provided with an upper bushing ring, the lower flange is provided with a lower bushing ring matched with the upper bushing ring, the upper bushing ring is provided with a first protruding part and a second protruding part at intervals, the first protruding part and the second protruding part are each of an annular structure, and the first protruding part and the second protruding part are coaxial with the upper bushing ring; an isolation gap exists between the two; sealing grooves are formed in the positions, corresponding to the first protruding part and the second protruding part, of the lower lining ring, and sealing gaskets matched with the first protruding part and the second protruding part are arranged in the sealing grooves. The double-sealing structure for the large flange of the nitric acid oxidation furnace equipment has the advantages of being good in sealing effect, easy to assemble and use and high in safety and reliability.

The present application relates to the technical field of water treatment, in particular to a DSD acid oxidation wastewater treatment method, comprising wastewater extraction, macroporous resin adsorption, iron-carbon microelectrolysis, MVR evaporation concentration; DNS in water is extracted by extractant to prepare DSD acid in DNS reduction section, improve product yield; the remaining DNS is enriched by macroporous resin adsorption, and after elution, DNS can be directly used for reduction to prepare DSD acid, the comprehensive removal rate of CODCr in the first two steps is 90-95%; iron-carbon microelectrolysis is used for advanced treatment, the color of effluent is colorless and transparent, and CODCr is below 100 mg / L; high-quality salt is obtained by MVR concentration, and the evaporated water is used for S2 resin desorption or DSD preparation process; the problem of DSD acid oxidation wastewater treatment is effectively solved.