225 results about "Sodium sulfites" patented technology

The invention relates to the technical field of water treatment agents, and particularly discloses an anti-corrosion deoxidizing composite agent for geothermal well recharge water and a preparation method of the anti-corrosion deoxidizing composite agent. The invention relates to an anti-corrosion and deoxidizing composite agent for geothermal well recharge water. The anti-corrosion and deoxidizing composite agent comprises the following raw materials: 30-40 parts of double modified sodium sulfite, 10-20 parts of a corrosion inhibitor, 8-15 parts of a scale inhibitor, 5-10 parts of amino trimethylene phosphonic acid, 5-10 parts of etidronic acid, 3-8 parts of polyethylene glycol monomethyl ether acrylate and 40-50 parts of deionized water. The dual-modified sodium sulfite is obtained by sequentially modifying sodium sulfite with a silane coupling agent and acrylic acid. The corrosion-resistant and oxygen-removing composite agent has the advantage of being high in oxygen-removing efficiency stability, the corrosion-resistant and scale-inhibiting functions are synchronously and synergistically improved on the basis that the oxygen-removing efficiency stability is guaranteed, and the complex working condition requirements of geothermal well recharge are completely met.

The application provides a method for synthesizing an eplerenone intermediate N-1 by one-pot method, and belongs to the technical field of organic synthesis. The method is characterized in that: the eplerenone intermediate N-4 is dissolved in dichloromethane, a potassium carbonate aqueous solution and dibromohydantoin are added to perform an opening ring reaction; after the reaction is completed, hydrochloric acid is directly added to perform a rearrangement reaction; then water is separated and methanol is added in the organic layer to perform an ozonation reaction; then sodium sulfite is added to perform a reduction reaction; then hydrochloric acid is added to perform a methyl esterification reaction, so as to obtain the eplerenone intermediate N-1 crude product, and finally the eplerenone intermediate N-1 fine product is obtained through refining. The method realizes the one-pot synthesis of the eplerenone intermediate N-1 from the eplerenone intermediate N-4 through the continuous reactions of opening ring, rearrangement, ozonation, reduction and methyl esterification, and can avoid column chromatography purification, so that the method becomes a green chemical process route with greatly reduced organic solvent consumption and wastewater.

The invention belongs to the technical field of desulfurization environmental protection, and particularly relates to a process method for extracting a sodium sulfite product through sodium desulfurization post-treatment and a dust removal device. Comprising the following steps: absorbing saturated desulfurization mother liquor in a desulfurization device, conveying the saturated desulfurization mother liquor into a desulfurization mother liquor tank by a slurry discharge pump, adding a sodium hydroxide solution with a certain concentration into the desulfurization mother liquor tank, and reacting and crystallizing to separate out a certain amount of sodium sulfite crystals; conveying the slurry in which a certain amount of crystals are separated out into a cyclone separator through a desulfurization mother liquor pump, and carrying out solid-liquid pre-separation in the cyclone separator; according to the invention, industrial waste gas generated after extraction of sodium sulfite can be reused, and pollution is reduced; the filtering membrane adsorbing sodium sulfite can be thoroughly cleaned; the unextracted sodium sulfite mixed in the dried and separated waste gas can be fully extracted and recovered, so that the extraction rate is increased; and stacking and packaging are carried out while the sodium sulfite is recycled, so that the collecting and packaging efficiency is improved.

The invention relates to the technical field of industrial wastewater treatment, in particular to a treatment method for treating high-sulfonic-group wastewater by advanced oxidation, which comprises the following steps: regulating the pH value of the wastewater to 3.0-4.0, then carrying out photo-Fenton oxidation, controlling the molar ratio of H2O2 to Fe < 2 + > to be 300: 1-400: 1, regulating the pH value of the effluent to 5.0-6.0, adding sodium sulfite to quench residual H2O2 and flocculate and precipitate iron mud, and finally, carrying out secondary oxidation on the wastewater to obtain the high-sulfonic-group wastewater. Performing anaerobic-aerobic biochemical treatment on the supernate, adding sodium carbonate and sodium hydroxide into biochemical effluent to soften and descale, concentrating in a mechanical vapor recompression evaporator, washing and recrystallizing crystallized mother liquor, and adsorbing and purifying the crystallized mother liquor with activated carbon to obtain an industrial salt product. The problem of MVR evaporation scaling is effectively solved by accurately controlling the neutralization pH and combining the softening step, finally, wastewater standard treatment and salt high-quality recovery are achieved, the COD removal rate can reach 95% or above, and excellent environmental and economic benefits are achieved.

This invention discloses an acetic acid-modified inorganic composite gel material and its preparation method, belonging to the field of organic material synthesis technology. The acetic acid-modified inorganic composite gel material comprises the following materials in parts by weight: 0.2-0.4 parts of acetic acid-Co3O4, 1.5-2.5 parts of acrylamide, 1-1.5 parts of glycerol, 0.05-0.1 parts of N-N-dimethylformamide, 0.25-0.5 parts of ammonium persulfate, 0.1-0.15 parts of sulfonated-Bi2O3, 0.6-0.9 parts of ethylenediamine, and 0.2-0.4 parts of PVP; the acetic acid-Co3O4 comprises materials in the following mass ratio: acetic acid:cobalt nitrate:thiourea:ammonium fluoride:sodium bicarbonate = 3-7:1.5-2.5:0.8-1.2:0.5-1:6; the sulfonated-Bi2O3 comprises materials in the following mass ratio: Bi2O3:sodium sulfite:H2O2:ammonium bicarbonate = 3-5:0.2-0.6:1-1.5:1. This material achieves efficient and stable catalysis for nitrogen reduction under mild conditions through structural defect regulation, interfacial functional group modification, heterojunction electronic regulation, and synergistic enhancement with organic gel.

The invention discloses a high-yield method for reducing dinitro and retaining sensitive protecting groups, which comprises the following steps: adding water, sodium dithionite and sodium carbonate into a container, stirring and clarifying, and dropwise adding a mixed solution containing raw materials; after the reaction is finished, extracting, separating liquid, concentrating, and purifying by silica gel column chromatography to obtain a product and a byproduct; the raw material is a compound containing a carbon-carbon double bond, a p-methoxybenzyl protecting group, a t-butyloxycarboryl protecting group and dinitro. Adding a byproduct into a phosphoric acid mixed solution for reaction; and after the reaction is finished, adding dichloromethane and water, dropwise adding triethylamine to adjust the pH value, extracting, separating liquid, drying, concentrating, and purifying by silica gel column chromatography to obtain the product. According to the method, a sodium hydrosulfite / sodium carbonate system and phosphoric acid step-by-step treatment strategy is adopted, reduction of dinitro is achieved under mild conditions, meanwhile, PMB protecting groups, Boc protecting groups and C-C double bonds are reserved, and the problem that stability and high yield of the protecting groups cannot be considered at the same time in an existing method is solved.

The application discloses a preparation method of a pesticide lignosulfonate sodium dispersant composition and belongs to the technical field of dispersants. The method comprises the following steps: S1, taking papermaking black liquor as raw material, performing standing precipitation, flocculation precipitation, membrane concentration and acid precipitation treatment to obtain purified lignin; S2, adding the purified lignin into water, adjusting the pH of the system to 10-11, then adding hydrogen peroxide to perform pre-oxidation, then adding formaldehyde and sodium sulfite to perform sulfomethylation reaction, and adding formaldehyde to perform polycondensation reaction; cooling and discharging, and performing spray drying to obtain lignosulfonate sodium; and S3, adding the lignosulfonate sodium and 1-ethyl-3-methyl imidazolium L-lactate into water and stirring and uniformly mixing, adding stevioside to perform ultrasonic treatment, forming a homogeneous system, and performing spray drying to obtain the pesticide lignosulfonate sodium dispersant composition. The lignosulfonate sodium dispersant composition can effectively improve the pesticide dispersion stability and pesticide biological activity, and meets the pesticide use requirement.

This invention belongs to the field of epoxy resin synthesis technology, specifically relating to epoxy resin and an anhydrous epoxy resin synthesis process. The anhydrous epoxy resin synthesis process of this invention includes the following steps: dissolving bisphenol A in an organic solvent, adding sodium dithionite and mixing thoroughly, then adding solid sodium hydroxide, reacting under negative pressure and heating conditions, filtering after the reaction, adding the sodium bisphenol A solution to epichlorohydrin containing solid sodium hydroxide, and heating to carry out the resin synthesis reaction; after the reaction, performing solid-liquid separation, collecting the liquid phase and performing vacuum distillation to remove the solvent and unreacted epichlorohydrin, obtaining the epoxy resin. The anhydrous epoxy resin synthesis process provided by this invention avoids epichlorohydrin hydrolysis and is a novel epoxy resin synthesis process that is low-cost, highly efficient, and ensures excellent product color. The epoxy resin prepared by this invention guarantees product quality, with low color and low epoxy equivalent.

The present disclosure discloses a composition for hair growth comprising Larix europea wood extract, Camellia sinesis leaf extract, Pisum sativum sprout extract, Curcuma longa (Turmeric) callus conditioned media, Hamamelis virginiana (Witch Hazel), Rosmarinus officinalis Leaf Oil, Glycerin, Glycine, Zinc Chloride, Sodium Metabisulfite, Gluconolactone, Sodium Benzoate, Calcium Gluconate, Tetrasodium ethylenediaminetetraacetic acid (EDTA), Saccharide Isomerate, Hyaluronic Acid, Hydrolyzed Hyaluronic Acid, Propanediol, Biotinoyl Tripeptide- 1, Alpha Glucosyl Hesperidin, Caffeine, Hydrolyzed Pea Protein, Polyalkylene Glycol Mono Butyl Ether, Acrylates / C 10-30 Alkyl Acrylate Crosspolymer, Panthenol, Niacinamide, Arginine, PEG-40 Hydrogenated Castor Oil, Ethylhexylglycerin, Phenoxyethanol, and water is added to the composition until the desired volume is achieved. A method for preparing the composition for hair growth is also provided.

The application discloses a feed oil and meat and bone meal co-production preparation process for improving protein retention rate, and relates to the field of animal feed.The preparation process comprises the following steps: S1, after crushing livestock and poultry slaughter by-products, water, lactic acid and sodium sulfite are added, and stirring treatment is conducted to obtain pretreated materials; S2, composite strain seed liquid is inoculated into the pretreated materials, and fermentation is conducted; S3, the fermented materials are heated, enzyme inactivation and sterilization treatment are conducted, and three-phase centrifugal separation is conducted to obtain upper oil, middle layer fermentation protein liquid and lower layer very fine bone residue; S4, the upper oil is subjected to water washing and vacuum dewatering to obtain feed oil; and the middle layer fermentation protein liquid and the lower layer very fine bone residue are combined and then subjected to low-temperature vacuum drying to obtain meat and bone meal.The process can effectively improve protein digestibility and protein retention rate, does not need high-temperature and high-pressure treatment, effectively retains heat-sensitive amino acids, and the product is rich in small-molecule peptides and soluble calcium and has excellent quality.

This invention belongs to the field of soil manganese extraction technology, and discloses a stepwise extraction method and application for manganese species in soil. First, exchangeable manganese is extracted using magnesium chloride; then, manganese carbonate and sulfides are extracted using hydrochloric acid; next, active Mn(III) bound to organic matter is extracted using pyrophosphate solution under alkaline pH; then, manganese oxides are dissolved using hydroxylamine hydrochloride; and finally, manganese bound to crystalline iron and manganese oxides is extracted using sodium dithionite solution. This stepwise extraction scheme accurately quantifies the concentration of active Mn(III) species bound to organic matter in the soil. Experimental results show that the extraction method of this invention can effectively separate different forms of manganese in soil. In particular, PP extraction successfully distinguishes Mn(III) bound to organic matter without introducing interfering substances such as iron minerals that may interfere with dissolution.

The application discloses a method for detecting the concentration of dissolved CO in fermentation liquor. The method comprises the following steps: (1) preparing CO saturated aqueous solution, oxygen-free aqueous solution, sodium hydrosulfite solution as a reference solution and deoxygenated myoglobin solution; (2) preparing an absorbance-CO saturation standard curve; (3) sampling and detection: taking a sample from the fermentation liquor as a sample to be detected by a sampling device, injecting the sample to be detected into a cuvette, adding 2.5 mL of deoxygenated myoglobin solution in the cuvette in advance and sealing the cuvette, adjusting zero with the reference solution, detecting the absorbance of the cuvette containing the sample to be detected at a wavelength of 415-425 nm by a spectrophotometer, substituting the obtained absorbance into the absorbance-CO saturation standard curve obtained in step (2) to obtain the corresponding CO saturation, and then converting the CO saturation into the concentration of dissolved CO according to the known CO solubility. The detection method has the characteristics of taking and measuring immediately, rapidness and simplicity.

The invention relates to a synthesis method of sulfopropionic anhydride. The synthesis method comprises the following steps: (1) mixing 3-bromopropionic acid and sodium sulfite in water, and carrying out sulfonation reaction to obtain a mixture; (2) mixing the mixture with an acidifying agent, and carrying out acidification reaction to obtain 3-sulfonyl propionic acid; and (3) mixing the 3-sulfonyl propionic acid with a dehydrating agent and an organic solvent, and carrying out a dehydration reaction to obtain the sulfopropionic anhydride. According to the invention, compounds such as 3-bromopropionic acid and sodium sulfite are used as reaction raw materials to prepare sulfopropionic anhydride. The method has the advantages of cheap and easily available raw materials, simple operation and high yield, and is suitable for large-scale production.

The application relates to an ultrasonic treatment method of high-impurity copper anode slime. The ultrasonic treatment method is realized through hierarchical ultrasonic strengthening and synergistic leaching. In the first-stage leaching, hydrogen peroxide-oxygen-rich air composite oxidants are combined with ultrasonic cavitation effects to realize efficient oxidation leaching of arsenic, antimony and bismuth; in the second-stage leaching, sulfuric acid-sodium sulfite mixed leaching agents are used to remove harmful impurities such as arsenic, antimony and bismuth under ultrasonic strengthening, and to efficiently enrich valuable metals such as gold, silver, selenium and tellurium, so that the treatment period is shortened, energy consumption and reagent consumption are reduced, resource comprehensive utilization is improved, and the method is suitable for efficient separation and resource recovery of high-impurity copper anode slime containing refractory impurities such as arsenic, antimony and bismuth and valuable metals such as gold, silver, selenium and tellurium.

The invention relates to the technical field of vanadium batteries, and provides a vanadium battery electrolyte and a preparation method thereof.The preparation method comprises the steps that vanadium pentoxide, concentrated sulfuric acid and water are mixed and then heated, then acid ester is added, then boiling, cooling and filtering are conducted in sequence, and the vanadium battery electrolyte is obtained; the mass ratio of vanadium pentoxide to concentrated sulfuric acid is 1: (1.3-1.5); the mass ratio of the vanadium pentoxide to the acid ester is 1: (1.1-1.3); the acid ester comprises the following components in percentage by mass: 50-51% of oxalic acid, 4-5% of sodium sulfite and 45-46% of ethyl acetate. Compared with the traditional vanadium battery electrolyte, the use amount of the concentrated sulfuric acid and oxalic acid is greatly reduced, the obtained electrolyte is weakly acidic, the corrosivity and danger are greatly reduced, and the electrolyte is not easy to separate out and not easy to block a film in the charging and discharging process. In conclusion, compared with the traditional electrolyte, the vanadium battery electrolyte provided by the invention is safer, more environment-friendly and more efficient.

The present application relates to the field of natural gas decarburization, and discloses a decarburization solvent, a decarburization method and system of carbon-containing natural gas, the decarburization solvent comprising a main agent, an activator and an auxiliary agent; wherein the main agent is N-methyldiethanolamine, the activator comprises a primary amine and a secondary amine, and the auxiliary agent is selected from at least one of potassium sorbate, sodium sorbate and sodium sulfite.The decarburization solvent and the decarburization method provided by the present application can not only make the absorption and regeneration equipment flexible to follow the change of the CO2 content of the raw gas in the natural gas development process and expand, but also avoid the corrosion and foaming of the tower equipment in the conventional process; meanwhile, the absorption and regeneration performance of the decarburization solution can be improved under the condition of meeting the purification index, and the regeneration heat consumption and the power consumption for pressurization of the amine liquid circulation can be greatly reduced.

This rotigotine-containing adhesive patch comprises a support layer and an adhesive layer, wherein the adhesive layer contains: at least one selected from the group consisting of rotigotine and pharmaceutically acceptable salts of rotigotine; a rubber-based adhesive base; and an antioxidant. The antioxidant includes propyl gallate, ascorbyl palmitate, and sodium pyrosulfite.

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

The invention discloses a method for improving the synthesis yield of vitamin K3, which comprises the following steps: S1, adding beta-menadione and sodium pyrosulfite into a container, adding ethanol as a solvent, stirring to react for 1-2 hours at the reaction temperature of 30-50 DEG C, heating to 40-70 DEG C, keeping the temperature for 10-60 minutes, and filtering while hot after the reaction is completed to obtain filtrate; and S2, adding sodium pyrosulfite into the filtrate, and then freezing, crystallizing, filtering, washing and drying to obtain a vitamin K3 finished product. When the vitamin K3 is prepared through cooling crystallization, the sodium pyrosulfite is added into the filtrate to be crystallized, so that the crystallization yield of the vitamin K3 can be effectively improved.

The application provides a method for preparing bismuth trioxide-cuprous oxide nanocomposite based on a synergistic reaction, which comprises the following steps: dispersing sodium bismuthate, sodium sulfite and cuprous chloride in deionized water to obtain a solid-liquid mixture; and placing the solid-liquid mixture under a hydrothermal condition, so as to in-situ prepare the Bi2O3-Cu2O nanocomposite through the synergistic effect of the redox reaction between sodium bismuthate and sodium sulfite in the system and the anion exchange reaction between cuprous chloride and hydroxyl ions generated in-situ. The application is based on the synergistic effect of the redox reaction and the anion exchange reaction under the same hydrothermal condition, and high-purity Bi2O3-Cu2O nanocomposite can be prepared in-situ in one step without adding an alkali source and a template agent. The prepared composite can effectively form a p-n heterojunction, significantly inhibit the recombination of photo-generated carriers, improve the photocatalytic activity and redox capacity of the material, and the preparation process is simple, green and economical, and easy for industrialized production.

The invention relates to a production process of a purple pigment with high color fidelity and dyeing uniformity. Comprising the following steps: 1) adding a copper sulfate solution into a dissolving solution containing basic purple 5BN and basic fuchsin, uniformly stirring, and heating to 78-85 DEG C to obtain a material A; (2) adding the sodium ferrocyanide solution into the material A in 70-90 minutes, maintaining the temperature, and uniformly stirring to obtain a material B; 3) adding the sodium sulfite solution into the material B, continuously stirring uniformly, adding the sodium ferrocyanide solution again, and stirring uniformly to obtain a material C; the preparation method comprises the following steps of 1, adding a material C into a reaction kettle, 2, adding ammonia water into the material C, adjusting the pH value to 7.5-8, and stirring for 25-35 min to obtain a material D, 5, maintaining the temperature of the material D, and carrying out emulsification dispersion treatment to obtain a material E, and 6, cooling the material E to a temperature below 60 DEG C to obtain a material F, and carrying out post-treatment on the material F to obtain the pink purple pigment. The pigment obtained through the above scheme has high purple color fidelity and dyeing uniformity.

The invention provides a method for synchronously preparing adsorption materials with different functions by modifying waste straws, and belongs to the technical field of material science. The method comprises the following steps: mixing straw, an alkali solution 1 and a formaldehyde solution to obtain a first mixture, and then heating to carry out a reaction 1; after the reaction 1 is finished, adding a sodium sulfite solution into the reaction system to obtain a second mixture, and then heating to carry out a reaction 2; after the reaction 2 is finished, carrying out solid-liquid separation to respectively obtain a first solid and a first liquid; mixing the first solid with an alkali solution 2 to obtain a third mixture, and then heating for reaction 3; after the reaction 3 is finished, adding a first reaction solution into the reaction system, and heating for reaction 4 to obtain resin; and adding a second reaction solution into the first liquid, and heating for reaction 5 to obtain the hydrosol. According to the method, the waste liquid is subjected to solution polymerization by utilizing the solvent characteristic of straw pretreatment, so that all-component utilization of the straw and modification of the waste liquid are realized.

The invention discloses an organic inhibitor for galena and application of the organic inhibitor. The inhibitor is 3-mercapto-1 sodium propane sulfonate (MPS). Aiming at the characteristics of close copper and lead symbiosis, high iron and zinc content and fine disseminated particle size of raw ore, the method adopts the technological process of'copper and lead partial bulk flotation tailing discarding-bulk concentrate regrinding-copper and lead separation flotation ', and comprises the following steps: firstly, in a bulk flotation section, utilizing a zinc sulfate and sodium sulfite combined reagent to efficiently inhibit sphalerite and pyrite under a weakly alkaline condition; a large number of gangue and zinc-sulfur minerals are thrown away in advance; the method comprises the following steps of: carrying out superfine regrinding dissociation on obtained bulk concentrate, then carrying out separation operation, and in a copper-lead separation section, replacing traditional dichromate with 3-mercapto-1 sodium propane sulfonate (MPS), carrying out a closed-loop process of one-roughing, three-refining and three-sweeping, and supplementing an inhibitor in fine selection operation, so that efficient inhibition of galena and preferable flotation of chalcopyrite are realized. The technological process is rigorous in design, the reagent system is green and environmentally friendly, and the resource recovery rate of the low-grade complex ore is remarkably increased.

The invention discloses an instant tea point food and a preparation method thereof. The preparation method of the instant tea point food comprises the following steps: blanching and cooling the tea point raw materials, and putting the cooled tea point raw materials in a sugar water solution for sugar boiling to prepare the original-taste instant tea point; removing moisture on the surface of the original-taste instant tea cake, and performing nitrogen-filled packaging and sterilization on the original-taste instant tea cake to prepare the instant tea cake food. According to the preparation method provided by the invention, the instant tea point food is prepared by combining high permeability with moisture control, sterilization and high-barrier packaging, preservatives and various food additives such as citric acid, sodium pyrosulfite and the like do not need to be used, hydrogen peroxide is not used for treatment, and a relatively long shelf life can be obtained. The invention provides a preparation scheme for preventing browning after high-temperature sterilization, and the instant tea point food keeps the original color of the product, is natural and attractive, is complete in tea point, is not easy to generate disintegrating slag, and has normal fragrance.

The invention relates to the technical field of medical analysis, in particular to a method for detecting the content of an antioxidant in bromfenac sodium eye drops through liquid chromatography, and particularly relates to a method for detecting the content of the antioxidant anhydrous sodium sulfite of the bromfenac sodium eye drops through high performance liquid chromatography. Wherein the mobile phase A is a methanol-buffer salt solution; a mobile phase B is methanol; eluting by using a gradient mobile phase, wherein the volume ratio of the mobile phase is 100%; preparing a reference solution and a test solution by taking the mobile phase A as a diluent, then respectively injecting the reference solution and the test solution into a liquid chromatograph, and recording chromatograms; calculating the content of anhydrous sodium sulfite by adopting an external standard method; the method comprises the following specific steps: (1) preparation of a reference substance solution: taking an anhydrous sodium sulfite reference substance, and adding a diluent for dissolving to obtain the reference substance solution; and (2) preparation of a test solution: taking the bromfenac sodium eye drops, and adding a diluent to dilute the bromfenac sodium eye drops to obtain the bromfenac sodium eye drops. The method disclosed by the invention is strong in specificity, high in stability, high in precision and high in accuracy, and has practical significance on quality control of the bromfenac sodium eye drops.

The invention belongs to the technical field of sludge treatment, and provides a method for strengthening anaerobic fermentation of sludge by activated sodium pyrosulfite, which comprises the following steps: pretreating sludge to obtain a sludge system; adding ferric salt and sodium pyrosulfite into the sludge system to obtain an activation system; and performing anaerobic fermentation on the active system to finish the treatment. By constructing a Fe < 3 + > / sodium pyrosulfite free radical system, the dissolution of organic matters in the sludge is improved, so that the generation of short-chain fatty acid (SCFAs) in the anaerobic fermentation process is promoted. Sodium pyrosulfite is dissolved in water to form sulfite species, under the action of ferric ions, the sulfite species can generate various active free radicals through electron transfer, and the free radicals have high oxidation capacity and can destroy sludge floc structures and extracellular polymeric substances, so that cell lysis is promoted, intracellular organic substances are released, and the sludge can be degraded. The concentration of a substrate available for anaerobic fermentation is improved, and the yield of short-chain acid is substantially improved.

This invention relates to the field of waste sludge treatment technology, specifically to an in-situ resource utilization method for a microbial-algae system and its application. The in-situ resource utilization method for the microbial-algae system includes: placing waste sludge, microalgae, and sodium sulfite in an anaerobic fermentation reactor, then adjusting the pH of the mixture and fermenting under anaerobic conditions; wherein the microalgae include at least one of the phyla of green algae, cyanobacteria, and diatoms; and no anaerobic sludge is added to the anaerobic fermentation reactor. This method can effectively utilize the microbial-algae system to increase the yield of volatile fatty acids during anaerobic fermentation in situ, and can also reduce the yield of waste sludge in situ, thereby lowering the subsequent disposal costs of sludge and microalgae in the secondary sedimentation tank.

The application provides a copper-lead sulfide ore flotation separation inhibitor and a preparation method and application thereof, and belongs to the technical field of ore-dressing reagents. The main components of the inhibitor are maleic acid acrylic acid copolymer, trisodium nitrilotriacetate and sodium sulfite. In the preparation, the maleic acid acrylic acid copolymer, the trisodium nitrilotriacetate and the sodium sulfite are mixed at normal temperature, and then are added into a high-shear emulsifying machine to be emulsified and dispersed, so that a uniform viscous suspension inhibitor is obtained. In the application, after the raw ore is treated, preselected ore slurry is obtained; copper-lead mixed flotation is performed first to obtain copper-lead mixed concentrate and copper-lead tailings; active carbon and sodium sulfide are added into the copper-lead mixed concentrate first, and reagents are added to perform copper-lead separation flotation to obtain copper and lead concentrates. The inhibitor has the advantages of being cheap, easy to obtain and store and environment-friendly. The inhibition effect on galena is good, the copper-lead sulfide ore separation effect is good, and the ore-dressing indexes are effectively improved.

The application discloses a treatment method for efficiently removing selenium from waste acid, and specifically comprises the following steps: preheating waste acid to be treated for removing selenium, adding sulfuric acid to adjust the H + concentration of 4-6 mol / L, then adding a reducing agent sodium sulfite Na2SO3, and fully stirring and mixing; controlling the temperature to be 55-70 DEG C to perform a first-stage reaction, then adding a composite catalyst prepared by mixing sodium thiosulfate Na2S2O3 and iodine I2, stirring and mixing, continuing to perform a deep reaction, and performing solid-liquid separation after filtration when the reaction is completed. The application uses sodium sulfite reduction, iodine and sodium thiosulfate catalysis as a substitute for the traditional SO2 reduction mode, solves the problem that the traditional SO2 reduction method is limited by pH liquid, accelerates the reaction rate through iodine and sodium thiosulfate catalysis, simultaneously solves the problem that the traditional sulfite cannot reduce selenium-containing substances other than selenite, and improves the reduction effect of selenium.

This invention relates to the field of biomaterial synthesis technology, specifically disclosing a method for preparing a class of catechol derivatives and their applications, administration, and preparation apparatus. The methods include: preparing dopa or carbidopa derivatives using a sodium sulfite-boric acid-argon protective system in an organic-aqueous mixture; or using dopa as a raw material, performing a methyl esterification reaction with SOCl2 and anhydrous methanol, followed by an exchange reaction with methyl trifluoroacetate to achieve a one-pot synthesis of Tfa-DOPA-OMe; or preparing acetal-protected tanshinone derivatives based on dopa derivatives or tanshinone and its derivatives; or using acetal-protected tanshinone and its esters to prepare natural catechol compounds such as Shimobashiric acid C, and preparing non-natural catechol compounds through coupling reactions with organic acids, amino acids and their derivatives, oligopeptides and polypeptides, alcohols, or sugars. Highly selective deprotection conditions achieve the goal of completely and thoroughly removing the acetal protection of catechols without destroying the ester bonds within the molecular structure.