373 results about "Sodium hypochlorite solution" patented technology

The invention provides a preparation method of an acid-resistant and chlorine-corrosion-resistant porous composite electrode and a device constructed on the basis of the electrode and used for preparing hydrogen and chlorine by electrolyzing a sodium chloride solution, two cavities are provided, an acid or neutral saturated sodium chloride solution is filled in the cavities, the cavities are separated by a proton exchange membrane or a diaphragm, and the proton exchange membrane or the diaphragm is filled in the cavities. And in the electrolysis process, the cathode generates high-purity hydrogen, the anode generates high-purity chlorine, the chlorine is absorbed by sodium hydroxide in the gas collection bottle and generates sodium hypochlorite, or the chlorine is introduced into a sodium bromide / sodium iodide solution to replace bromine / iodine elementary substances, and the chlorine is discharged from the gas collection bottle. The sodium hypochlorite solution and the bromine / iodine water are used for disinfection and sterilization experiments. The corrosion-resistant porous composite electrode for electrolysis of an acidic or neutral saturated sodium chloride solution is prepared, the electrolysis voltage of the corrosion-resistant porous composite electrode is further reduced by loading a cathode / anode catalyst, and an acidic or neutral saturated sodium chloride solution electrolysis device constructed based on the electrode can be used for preparing high-purity hydrogen and chlorine.

The invention belongs to the technical field of drinking water purification equipment, and particularly relates to an intelligent dosing system based on cloud computing, which comprises a monitoring unit, a data control unit and a dosing unit, according to the invention, the content of residual chlorine in the clean water tank and the concentration of sodium hypochlorite in the dosing pipe are detected, and the dosing rate and start-stop time of the dosing unit are controlled according to the detection result, so that dynamic control of the concentration of sodium hypochlorite in tap water is realized; the mode of storing the sodium hypochlorite solution in advance is utilized, the burden of the sodium hypochlorite generator is reduced, meanwhile, the adjustable range of the dosing rate of the dosing unit is expanded, the adjusting rate of the residual chlorine content in tap water is flexible, and tap water chlorine disinfection operation is more convenient.

The invention relates to the technical field of chemical preparations, in particular to a sodium hypochlorite stabilizer, a preparation method and a use method thereof and a stable sodium hypochlorite solution. The sodium hypochlorite stabilizer is prepared from the following components in percentage by mass: 2.5 to 3.5 percent of sodium diethylenetriamine pentaacetate, 2.5 to 3.5 percent of disodium ethylene diamine tetraacetate, 1.0 to 1.25 percent of sodium silicate, 3.5 to 5.0 percent of sodium bicarbonate, 2.5 to 3.0 percent of sodium chloride and the balance of water. The stable sodium hypochlorite solution prepared by adopting the sodium hypochlorite stabilizer disclosed by the invention is higher in stability and longer in validity period.

The invention relates to the field of fine chemical engineering, and discloses a green process for preparing chloramine T by a continuous flow reactor. The method comprises the following steps: respectively pumping p-toluenesulfonamide, a sodium hydroxide solution and a sodium hypochlorite solution into a micro-channel mixer for instantaneous mixing, and carrying out chlorination reaction in a multi-stage temperature control tubular reaction unit; the concentration of free chlorine is detected on line at an outlet, and the flow rate of a chlorine source is dynamically adjusted through a PID algorithm, so that closed-loop control is realized; the reaction liquid is directly crystallized and separated to obtain the product without alkali wash. The system comprises a base solution and chlorine source conveying subsystem, a micro-channel mixer, a multi-stage reaction unit, an online monitoring module, a central controller and a crystallization unit. The side reaction is inhibited from the source, so that the free chlorine is less than or equal to 0.5 mg / L, the alkali washing step is omitted, the COD (Chemical Oxygen Demand) of the wastewater is reduced by more than 80%, the product purity is more than or equal to 99.5%, and the productivity is improved by 3 times.

The present invention relates to the technical field of nanofiltration membranes, and particularly relates to a preparation method for a nanofiltration membrane for regulating and controlling membrane surface charges. The preparation method comprises: step 1: (1) sequentially adding piperazine, a fiber additive, an ionic liquid and polyvinyl pyrrolidone into deionized water to obtain a water phase; and (2) adding trimesoyl chloride into normal hexane to serve as an oil phase; step 2, dipping a base membrane in the water phase for 1-3 minutes, and removing the redundant water phase; transferring same into the oil phase and subjecting same to polymerization for 2-3 minutes, and removing the redundant solution; and curing same at 80-85ºC for 5-6 minutes, and dipping same in deionized water for 1-2 days, so as to obtain a composite base membrane; and step 3, firstly placing the composite base membrane in a sodium hypochlorite solution for a primary post-treatment, and cleaning same; and transferring same into a sodium hydrosulfide solution for a secondary post-treatment, washing same until neutral, soaking same in deionized water for 1-3 days, and drying same to obtain a nanofiltration membrane.

The utility model relates to the technical field of sewage treatment, in particular to a production system for preparing sodium hypochlorite through electrolysis, which comprises a soft water preparation module, a salt dissolving module, a generator module, a storage module, a feeding module and a pickling module, and the soft water preparation module is respectively connected with the salt dissolving module and the generator module. The soft water preparation module provides soft water for the salt dissolving module and the generator module, saline water output by the salt dissolving module and the soft water conveyed to the generator module by the soft water preparation module are mixed into diluted saline water, then the diluted saline water is input into the generator module, and the generator module electrolyzes to generate a sodium hypochlorite solution and inputs the sodium hypochlorite solution into the storage module. The generator module is further connected with an acid pickling module, the acid pickling module is used for inputting acid liquor into the generator module to clean the generator module, excessive scaling of the generator module is avoided, the production efficiency of the generator module is guaranteed, and the overall production efficiency of the production system is also guaranteed and improved.

The invention relates to the technical field of orchid seed germination, and discloses a method for promoting orchid seed germination by utilizing crispus fungi, which comprises the following steps of: selecting the root of a wild adult orchid seedling growing in Changbai Mountain, searching a root section with hypha mass by utilizing a bare-handed slicing technology and a CH3COOH black ink dyeing technology, and inoculating the hypha mass into the root section; the method comprises the following steps: washing a root segment containing a fungal filament cluster for 48 hours under a running water condition, clamping the root segment into a 2% sodium hypochlorite solution by tweezers after high-temperature sterilization, soaking for 30 seconds, then putting the root segment into a sterile water flask, cleaning, and absorbing excessive moisture. The method comprises the following steps: searching a root section with a hypha group from the root of an orchid seedling, culturing to grow hyphae under an illumination condition, transferring single-colony hyphae into an FIM culture medium, continuously culturing and continuously purifying to obtain a fragile mushroom fungus strain, inoculating the fragile mushroom fungus strain into an oat culture medium of orchid seeds, and setting a control group by using a sterile agar block. The germination rate and the protocorm formation rate of the orchid seeds are calculated, and the method can be applied to orchid seed breeding.

This invention discloses a method for determining fiber microplastics in aqueous textile solutions based on fluorescence spectrophotometry, belonging to the field of textile pollutant detection technology. The method includes: S1, collecting wastewater and filtering it through a filter membrane; S2, rinsing the filter membrane with sodium hypochlorite solution; S3, rinsing the fiber microplastics on the filter membrane into a separatory funnel; S4, pouring out a portion of the fiber microplastics from the upper end of the separatory funnel and collecting another portion from the lower end; S5, repeating S1-S4, rinsing the filter membrane with hydrochloric acid during this process, and collecting the remaining fiber microplastics; S6, dyeing the three solutions obtained; S7, preparing standard series solutions using polyester, polyamide, and polypropylene standard liner; S8, measuring and plotting a standard curve of fluorescence intensity versus fiber microplastic concentration using a fluorescence spectrophotometer; S9, measuring the fluorescence intensity of the three solutions obtained in S6. This invention is applicable to the field of aqueous textile solutions, enabling quantitative analysis of unknown samples, and can analyze both single and mixed samples with minimal detection bias.

A hypochlorous acid preparation system is provided. The hypochlorous acid preparation system includes: a hypochlorous acid preparation apparatus comprising: a first inlet, wherein sulfuric acid collected from a clean room located in a semiconductor fabrication plant enters the hypochlorous acid preparation apparatus through the first inlet; a second inlet, wherein sodium hypochlorite solution enters the hypochlorous acid preparation apparatus through the second inlet; a third inlet, wherein deionized water enters the hypochlorous acid preparation apparatus through the third inlet; and an outlet, wherein hypochlorous acid is produced in situ by mixing the sulfuric acid, the sodium hypochlorite solution, and the deionized water and exits the hypochlorous acid preparation apparatus through the outlet.

To provide a method and an apparatus for producing a sodium hypochlorite solution on-site at a high efficiency and at the initial cost and suppressing operating cost without any problems about impurities derived from raw material water and raw salt. A method of producing a sodium hypochlorite solution on-site in the vicinity of a physical plant where a sodium hypochlorite solution is used. In production of a sodium hypochlorite solution by feeding secondary salt water, in an electrolyzer comparted into an anode chamber and a cathode chamber with an ion-exchange membrane, to the anode chamber and allowing components in the anode chamber and the cathode chamber after electrolysis to react in a reaction tank, there are included respective steps of treating raw material water A with a cation-exchange resin B to generate purified water 5, dissolving raw salt D in the purified water to generate primary salt water E, performing an examination for confirming the presence or absence of a precipitate or suspended solid in the primary salt water, and directly performing chelating in the case of no precipitate or suspended solid contained in the primary salt water, or performing chelating after addition of an acid component for dissolution of the precipitate or suspended solid in the case of the precipitate or suspended solid contained therein, to generate secondary salt water 4.

The invention discloses a segregation method of bark suppository cells, and belongs to the technical field of plant cell segregation treatment. The isolation method of the bark suppository cells comprises the following steps: (1) cooking bark particles to remove impurities, so as to obtain impurity-removed suppository particles; (2) adding the impurity-removed suberect particles into a segregation reagent, and reacting for 40-60 minutes under the condition of 55-65 DEG C, so as to obtain segregated suberect cells; the segregation reagent is composed of a sodium hypochlorite solution with the mass concentration of 1%-10% and a hydrogen peroxide solution with the mass concentration of 0.5%-20%; (3) sequentially carrying out ultrasonic dispersion and freeze-drying treatment on the isolated suppository cells to obtain a suppository cell aggregate; and dispersing the suberect cell aggregate by using a weak polar reagent to obtain a complete single suberect cell. According to the method, the wooden suppository cells are separated through the synergistic oxidation effect of the sodium hypochlorite and the hydrogen peroxide solution, and efficient and complete separation of the wooden suppository cells in a short time is achieved.

The invention discloses a chenopodium quinoa powder processing method which comprises the following steps: soaking chenopodium quinoa seeds in a sodium hypochlorite solution with the mass percentage concentration of 2% to disinfect for 8 minutes, then germinating for 72 hours in an environment with the temperature of 25 DEG C and the humidity of 85%, and spraying a calcium chloride solution with the mass percentage concentration of 8% every 2 hours during the period, the mass ratio of the calcium chloride solution to the quinoa seeds sprayed for the first time is 3: 10, and the mass ratio of the calcium chloride solution to the quinoa seeds sprayed for the rest times each time is 1: 20, so that the quinoa is germinated to obtain germinated quinoa; germinated quinoa and seaweed dietary fibers are stirred for 15 minutes and uniformly mixed by using stirring equipment at the rotating speed of 500rpm, and then the quinoa powder processing method disclosed by the invention has the advantages that the yield of yeast protein can be remarkably increased, and reducing sugar in the quinoa powder is effectively consumed in the active growth and reproduction period of yeast.

The invention relates to the field of food processing, and discloses a fresh-keeping processing method of green bamboo shoots, which comprises the following steps: S1, cleaning collected green bamboo shoots: firstly, manually cleaning impurities on the surfaces of the bamboo shoots, and then carrying out secondary cleaning by using a sodium hypochlorite solution with the concentration of 0.02-0.05%; s2, grading and classifying the cleaned green bamboo shoots according to the appearance color and the tenderness degree; s3, the bamboo shoots are properly aired, ultraviolet rays are used for disinfecting the operation environment, 75% ethyl alcohol is used for spraying treatment on the operation contact surface, and a disinfected cutter is used for removing pollution wounds of the green bamboo shoots. Through manual cleaning and secondary cleaning of the bamboo shoots with a 0.02-0.05% sodium hypochlorite solution, ultraviolet sterilization and disinfection of operation surfaces and tools with 75% ethanol are combined, microorganisms and impurities are effectively removed, the risk of wound pollution is reduced, the wound is soaked with a fresh-keeping solution and packaged with a double-layer paper bag, the fresh-keeping effect is enhanced, the moisture loss of the bamboo shoots is reduced, and the quality of the bamboo shoots is improved. And a plurality of defects of the traditional method are improved.

The invention relates to the technical field of rice seed germination accelerating systems and methods. Seed selection is conducted, specifically, rice seeds which are full and free of damage are screened, and impurities are removed; the rice seeds are soaked in a plant growth regulator mixed solution to be subjected to oscillation treatment, the mixed solution is composed of gibberellin with the concentration being 20-50 mg / L, pimacol with the concentration being 5-15 mg / L and polyoxyethylene lauryl ether with the concentration being 0.01-0.03%, the liquid temperature is kept at 30 + / -2 DEG C, and the treatment time is 2-4 hours; gradient disinfection: primary disinfection: putting the pretreated seeds into a 0.3-0.5% hydrogen peroxide solution at the temperature of 40-50 DEG C, and stirring for 15-20 minutes; secondary disinfection: transferring to a 0.8-1.2% sodium hypochlorite solution at the temperature of 25-30 DEG C, adding a 0.05-0.1 mol / L phosphate buffer solution to adjust the pH value to 6.8-7.2, and standing for 40-60 minutes; the disinfected seeds are put into magnetized water containing 0.1%-0.3% of chitosan derivatives and 0.05%-0.15% of sodium alginate, the magnetic field intensity ranges from 300 gauss to 500 gauss, and ultrasonic waves of 30 kHz to 50 kHz are adopted for assisting permeation for 1 h to 2 h; the rice seed germination accelerating system and method are high in germination accelerating efficiency.

The invention relates to the field of hydrazine hydrate, in particular to an efficient and green hydrazine hydrate synthesis method. The efficient and green hydrazine hydrate synthesis method comprises the following steps: mixing chlorine, sodium hydroxide and water, and reacting to obtain a sodium hypochlorite solution; the method comprises the following steps: mixing a sodium hypochlorite solution, urea and a catalyst, and reacting to obtain hydrazine hydrate, tail gas and a byproduct; and tail gas and by-products are recovered. Through mechanism-driven process design, high efficiency, greenization and economy of hydrazine hydrate synthesis are realized, and a sustainable solution is provided for industrial application.

The utility model provides a continuous production device of sodium hypochlorite. The continuous production device comprises a first reaction tower, a second reaction tower, a tail gas absorption tower, a sodium hypochlorite finished product tank, a sodium hypochlorite circulating tank and an alkali liquor storage tank which are communicated, the first reaction tower is communicated with a chlorine pipeline, the first reaction tower, the second reaction tower and the tail gas absorption tower are communicated with a sodium hypochlorite circulating tank through a heat exchanger, and liquid outlet pipelines of the first reaction tower, the second reaction tower and the tail gas absorption tower are respectively provided with a first ORP detector, a second ORP detector and a third ORP detector; a sodium hypochlorite finished product valve is arranged on a liquid inlet pipeline of the sodium hypochlorite finished product tank, a sodium hypochlorite circulating valve is arranged on a liquid inlet pipeline of the sodium hypochlorite circulating tank, and the first ORP detector, the second ORP detector and the third ORP detector are respectively linked with the sodium hypochlorite finished product valve and the sodium hypochlorite circulating valve. The device can monitor the temperature and the ORP value of the circulating liquid in real time, the quality and the production efficiency of the sodium hypochlorite solution are greatly improved, and labor is saved.

The invention discloses a method for determining fiber micro-plastics in a textile aqueous solution based on fluorophotometry, and relates to the technical field of textile pollutant detection, and the method comprises the following steps: S1, collecting wastewater, and filtering with a filter membrane; s2, washing the filter membrane with a sodium hypochlorite solution; s3, flushing the fiber micro-plastic on the filter membrane into a separating funnel; s4, part of the fiber micro-plastic is poured out from the upper end opening of the separating funnel, and the other part of the fiber micro-plastic is collected from the lower end opening of the separating funnel; s5, repeating the steps S1 to S4, and washing the filter membrane with hydrochloric acid during the period to leave and collect the residual fiber micro-plastic; s6, dyeing the obtained three solutions; s7, taking polyester, polyamide and polypropylene standard linings to respectively prepare standard series solutions; s8, measuring and drawing a standard curve of the fluorescence intensity and the fiber micro-plastic concentration by using a fluorospectro photometer; and S9, determining the fluorescence intensity of the three solutions obtained in the step S6. The method is applied to the field of textile water solutions, unknown samples can be quantitatively analyzed, single samples and mixed samples can be analyzed, and the detection deviation is small.

The invention discloses a sewage treatment membrane and a preparation method thereof, and relates to the field of sewage treatment. When the sewage treatment membrane is prepared, porous nano titanium dioxide, 3, 5-diaminopyrazole and benzo [1, 2-B: 3, 4-B ': 5, 6-B'] trithiophene-2, 5, 8-trialdehyde are uniformly mixed to prepare modified nano titanium dioxide; the preparation method comprises the following steps: reacting 1, 3, 5, 7-tetramethylcyclotetrasiloxane, 1, 3-bis (3-aminopropyl) tetramethyldisiloxane, 2-vinyl imidazole and 1-allylhydantoin to prepare functionalized amino siloxane; and uniformly mixing p-phenylenediamine, functionalized amino siloxane, pyromellitic dianhydride, modified nano titanium dioxide and zinc nitrate hexahydrate, and treating with a sodium hypochlorite solution to obtain the sewage treatment membrane. The sewage treatment membrane prepared by the invention has excellent heavy metal ion complexing property, antibacterial property and photocatalytic degradability.

The invention provides a synthesis method of 5-bromine-2-methyl benzoic acid, o-toluic acid and a bromination reagent are subjected to bromination reaction in an oxidizing solvent, the bromination reagent is HBr, and the oxidizing solvent is a sodium hypochlorite solution. The synthesis method provided by the invention is simple and convenient in process, strong in operability, easy to control and capable of remarkably improving the production efficiency and reducing the production cost, thereby having a good large-scale industrial application prospect.

The invention relates to the technical field of chemical synthesis, and discloses a method for preparing 2, 5-furandicarboxylic acid, which comprises the following steps: dispersing cobalt nitrate and nickel sulfate into an aqueous solution of polyvinylpyrrolidone at room temperature; adding a sodium borohydride solution to obtain nano colloid; preparing an aqueous suspension of cerium oxide, and adding the aqueous suspension into the nano colloid; centrifugally filtering, and recovering a solid product; washing the solid product; centrifuging, putting solid powder obtained after centrifuging into a drying oven, and drying; and calcining and grinding the solid powder to finally prepare the Co-Ni / CeO2 catalyst. And dissolving 5-hydroxymethylfurfural in water at normal temperature, adding the prepared Co-Ni / CeO2 catalyst and a sodium hypochlorite solution, reacting, and filtering to remove the catalyst, thereby obtaining the 2, 5-furandicarboxylic acid. The method disclosed by the invention has the advantages of no use of strong base, low reaction temperature, short reaction time, few byproducts, greenness and sustainability.

The utility model discloses a sodium hypochlorite waste liquid treatment device for a chlorination process titanium dioxide oxidation process, which relates to the technical field of titanium dioxide production waste liquid recovery and treatment and comprises a sodium hypochlorite storage tank, a thick slurry tank, filtering equipment and a clear liquid tank. An outlet of the filtering device is connected with an inlet of the clear liquid tank, the filtering device is a filter press, an outlet is formed in the bottom of the thick slurry tank and connected with an inlet of the filter press, and the clear liquid tank is used for storing qualified filtrate filtered out by the filter press. When the device is used, a natural settling process does not need to be waited, sodium hypochlorite waste liquid collected in the sodium hypochlorite storage tank can be directly fed into the thick slurry tank through the bottom outlet, and solid-liquid separation operation is performed by using the filter press, so that complete recovery treatment of waste alkali liquid in a titanium dioxide tail gas oxidation process is realized; the clarified sodium hypochlorite solution and the titanium dioxide filter cake after filter pressing can be sold as products.

Provided are a preparation process for a modified hydroxyapatite and the use thereof. The preparation process comprises the following steps: S1. removing impurities from coral by using a sodium hypochlorite solution, followed by crushing to obtain coral particles; S2. subjecting the coral particles and a phosphate solution to a hydrothermal reaction at a pH value of 9-11 to obtain coralline hydroxyapatite; S3. mixing and reacting the coralline hydroxyapatite and an ion source to obtain an ion source-doped coralline hydroxyapatite; and S4. heating the ion source-doped coralline hydroxyapatite, and sintering and cooling same to obtain an ion source-doped coralline β-tricalcium phosphate, wherein the ion source comprises a strontium source. The modified hydroxyapatite prepared by the preparation process has a better degradation performance and mechanical adaptability, which improves the biological activity and osteoinductivity of coral artificial bones, and facilitates bone tissue ingrowth.

The invention provides a preparation method of a triazine halamine antibacterial agent and a precursor thereof, and also provides a preparation method of a liquid ammonia mercerized antibacterial fabric. The preparation method of the liquid ammonia mercerizing antibacterial fabric comprises the following steps: soaking a fabric in anhydrous liquid ammonia under a tension-free condition, drying and cleaning; dissolving a halamine antibacterial precursor and a metal salt catalyst in water to prepare an antibacterial finishing solution, and dipping the liquid ammonia mercerized fabric in the antibacterial finishing solution; adding a solid alkali agent into the antibacterial finishing liquid, continuously dipping the liquid ammonia mercerized fabric, washing with water, and drying; soaking the fabric in a sodium hypochlorite solution for reaction, taking out and drying to obtain the liquid ammonia mercerizing antibacterial fabric. The liquid ammonia is adopted for pretreatment of the fabric, the excellent mercerizing effect is given to the fabric, meanwhile, the grafting rate of the halamine antibacterial agent is remarkably increased, the antibacterial agent can be more firmly finished on the fabric at the low temperature, the reaction process is simple, the production speed is high, efficiency is high, no toxicity and no pollution are achieved, and the processing requirements of ecological textiles are met.

The invention discloses a novel preparation method of basic magnesium hypochlorite and application of the basic magnesium hypochlorite in magnesium-based flame-retardant antibacterial filler. The novel preparation method comprises the following steps: under the assistance of pulsed ultrasound, adding a buffer solution into a sodium hypochlorite solution to adjust the pH value to 9.0-10.5; then adding a magnesium chloride solution for reaction to prepare basic magnesium hypochlorite; intermittent pulses are adopted in the pulse ultrasound, the frequency is 20-40 kHz, and the power density is 100-500 W / L; the pulse ultrasonic technology is introduced, the reaction process can be optimized through the cavitation effect and the micro-mixing effect, the pH distribution of a reaction system is optimized through pulse ultrasound, local overhigh alkalinity is avoided, generation of magnesium hydroxide is inhibited, the particle size of a product can be effectively reduced, and the yield of the product is improved. High-purity basic magnesium hypochlorite (Mg (OH) 2 is less than 1wt%), high available chlorine (greater than or equal to 41%) and narrow particle size distribution (D50lt; and when the flame-retardant antibacterial filler is used as the flame-retardant antibacterial filler, the performance is more excellent.

The invention provides a treatment method of household garbage leachate. The treatment method comprises the following steps: measuring index data of to-be-treated garbage leachate; carrying out preliminary filtration on the leachate; the sodium carbonate and sodium hydroxide solution and calcium and magnesium ions are added to achieve the hardness removal effect; adjusting the pH value of the filtrate to 4-6, adding a sodium hypochlorite solution, adjusting the pH value of the solution obtained after bentonite decoloration and sand-water separation to 7-8, and adding polyaluminum ferric chloride and cation PAM; carrying out electrolytic treatment; and adding granular active carbon. In the physicochemical treatment stage, the conductivity of the leachate is remarkably reduced, the water quality is softened, the chromaticity of the leachate and part of water quality indexes are reduced, after physicochemical treatment, a large number of chlorine-containing free radicals, hypochlorous acid and other strong oxidizing substances are generated on the surface of the anode by means of electrochemical oxidation, and the indexes such as COD, ammonia nitrogen and total nitrogen are further controlled; and finally adsorbing by using granular active carbon. The technological process is clear, easy to operate, economical and efficient.

The invention provides a method for harmlessly discharging high-salt flowback liquid wastewater and producing a byproduct sodium hypochlorite, and relates to the field of wastewater recycling. The method comprises the following steps: mixing high-salt flowback fluid wastewater with a liquid gel breaker, and carrying out micro-nano bubble aeration treatment to obtain gel-broken viscosity-reduced wastewater; the method comprises the following steps: mixing gel-breaking viscosity-reducing wastewater with a sodium-containing impurity removal agent A, and reacting to obtain primary hardness and impurity removal clear liquid; mixing the primary hardness and impurity removal clear liquid with alkali liquor, and performing ozone nano-bubble treatment to obtain organic matter removal clear liquid; mixing the organic matter removal clear liquid with a sodium-containing impurity removal agent B, and reacting to obtain secondary hardness and impurity removal clear liquid; and filtering the secondary hardness and impurity removal clear liquid through activated carbon, evaporating and concentrating to obtain a sodium chloride solution, and electrolyzing the sodium chloride solution to obtain a sodium hypochlorite solution. According to the method, chloride ions are converted into the sodium hypochlorite solution, and resource utilization is achieved; the treatment pressure of the high-salt flowback fluid can be effectively relieved, and an effective way is found for resource utilization of the high-salt calcium wastewater.

The utility model discloses a waste liquid purification device for acrylic coating, which belongs to the technical field of waste liquid purification equipment and comprises a disinfection tank, a flocculation tank mounted on one side of the disinfection tank, a sedimentation tank mounted on one side of the flocculation tank, a discharge tank mounted on one side of the sedimentation tank, and a water injection pipe fixedly connected to the other side of the disinfection tank. A filter plate positioned below the water injection pipe is mounted on the inner side of the disinfection tank. Waste liquid enters the disinfection tank, solid impurities in the waste liquid are filtered out, a sodium hypochlorite solution is introduced into the disinfection mechanism so that the waste liquid can be disinfected and deodorized, the waste liquid enters the flocculation tank through a first through hole through the arrangement of the flocculation tank and the sedimentation tank, and a polyaluminum chloride solution is introduced into the flocculation tank through the flocculation mechanism so that the waste liquid can be purified. A motor drives a stirrer to uniformly stir and then enters a sedimentation tank through a second through hole, flocculated colloid sinks to the bottom of the tank, and when the colloid is accumulated to a certain amount, a blow-off pipe is opened, a first electric telescopic rod is started to push a push plate, and colloid impurities are discharged.

The invention relates to a method for detecting the iron content in sodium hypochlorite, and belongs to the technical field of analytical chemistry detection. The method comprises the following steps: adjusting the pH value of a sodium hypochlorite solution sample, sequentially adding a reducing agent and a buffer solution, and pre-treating the sodium hypochlorite sample to neutralize the strong oxidizing property of the sodium hypochlorite sample and adjust the pH value of the system; then adding a color developing agent to enable the iron ions to form a stable colored complex, finally determining the absorbance by adopting a spectrophotometer under a specific wavelength, and calculating the iron content through a standard curve. The method is simple and convenient to operate and high in adaptability, interference of oxidability and impurity metal ions can be effectively eliminated, the detection sensitivity, accuracy and repeatability are remarkably improved, and the method is suitable for quality control and conventional analysis of a high-purity sodium hypochlorite product.

The invention discloses nano cerium dioxide as well as a preparation method and application thereof. The preparation method of the nano cerium dioxide comprises the following steps: (1) mixing a cerium salt mother solution and a sodium hypochlorite solution for reaction to obtain a first mixed solution; adding an alkali solution into the first mixed solution for reaction, adjusting the pH value of the reaction system to 6-6.5, continuing stirring for reaction at 80-90 DEG C for 1.5-3 hours, adding a sodium hypochlorite solution for reaction, adjusting the pH value of the reaction system to 6-6.5, and continuing stirring for reaction at 80-90 DEG C for 7-17 hours to obtain a second mixed solution; and (2) acidifying the second mixed solution, centrifuging to obtain a cerium dioxide precipitate, and drying the cerium dioxide precipitate to obtain the nano cerium dioxide. According to the method, the superfine nano spherical cerium dioxide particles with good dispersity, uniform particle size and high purity can be prepared at low temperature without adding any organic reagent. The method is short in production period and suitable for large-scale production.

This invention relates to the field of automatic control technology, specifically to a method for stabilizing and controlling the effective chlorine content of sodium hypochlorite solution. During the cooling stage of the sodium hypochlorite solution, an online electrochemical sensor acquires the concentration signal of free trace metal ions in the solution. When the signal reaches a preset threshold of the controller, the controller instructs a peristaltic pump to add a compound stabilizer to the solution. The compound stabilizer is prepared by mixing a specific short peptide containing cysteine ​​and histidine with a silicate buffer solution. After adding the compound stabilizer, the solution undergoes short-term ultrasonic cavitation treatment. This method uses a specific short peptide instead of traditional aminopolycarboxylate salts, avoiding the breaking and failure of carbon-nitrogen bonds under strong oxidizing conditions, preventing secondary release of metal ions that could trigger catalytic decomposition, extending the effective chlorine half-life, and reducing the amount of chlorate byproducts generated.