119 results about "Hydrogen Sulfate" patented technology

The invention provides a method for preparing high-purity acrylate by removing trace impurity aldehyde, which comprises the following steps: mixing crude acrylate with a polymerization inhibitor to form an organic phase; adding an aqueous solution of a dealdehyding agent into the organic phase to form an oil-water two-phase system; the oil-water two-phase system is forcibly stirred for 0.1-2.0 hours at the temperature of 20-40 DEG C, so that the impurity aldehyde and the dealdehyding agent are subjected to nucleophilic addition reaction, and a generated aldehyde-dealdehyding agent addition product is dissolved in a water phase; standing and layering the reacted material, separating and removing a water phase to obtain an organic phase without impurities; carrying out reduced pressure rectification on the organic phase after impurity removal to obtain a high-purity acrylate product with the total aldehyde content lower than 50ppm; wherein the aldehyde removing agent is sodium hydrogen sulfite, potassium hydrogen sulfite, calcium hydrogen sulfite, ammonium hydrogen sulfite or a mixture of any two or more of the sodium hydrogen sulfite, the potassium hydrogen sulfite, the calcium hydrogen sulfite and the ammonium hydrogen sulfite. The method is efficient, economical, free of solid deposition and easy for industrial continuous operation.

The invention relates to the technical field of niobium-tantalum-iron ore purification, in particular to a method for preparing high-purity tantalum pentoxide and niobium pentoxide from niobium-tantalum-iron ore. The method comprises the following steps: firstly, adding ammonium fluoride and ammonium sulfate to help mineral decomposition and reduce the roasting temperature, then treating the niobium-tantalum iron ore by using a sulfuric acid-hydrofluoric acid mixed solution to fully dissolve niobium-tantalum oxides, then extracting and separating niobium and tantalum by using a specific solvent system, and finally adding ammonia water to precipitate and calcine to obtain the niobium-tantalum iron ore. The high-purity niobium pentoxide and tantalum pentoxide are prepared, the product yield is high, the impurity content is low, and the niobium pentoxide and tantalum pentoxide are suitable for being used as raw materials of capacitor-grade tantalum powder and niobium powder.

The invention discloses a composite browning liquid for a printed circuit board and a preparation method of the composite browning liquid. The composite browning liquid comprises the following components: 60-85 g / L of 98 wt% concentrated sulfuric acid, 12-20 g / L of 30 wt% hydrogen peroxide, 1-2 g / L of a modified corrosion inhibitor, 8-14 g / L of a silane coupling agent, 1.5-3 g / L of 1-butyl-3-methylimidazolium hydrogen sulfate, 4-8 g / L of an impregnating compound, 5-8 g / L of a dispersing agent and the balance of deionized water. The modified corrosion inhibitor prepared by a specific method, the silane coupling agent, the ionic liquid and the compound surfactant are scientifically compounded, so that the copper surface treatment effect is remarkably improved, and the inherent contradiction between binding force improvement and over-etching prevention of a traditional browning liquid is solved; the browning liquid has the advantages of stable treatment effect, long service life, reduction of waste liquid output and the like, and is suitable for industrial production requirements of high-density printed circuit boards.

The invention relates to a method for comprehensively recycling a positive electrode material of a waste lithium iron phosphate battery, which comprises the following steps of: (1) discharging the waste lithium iron phosphate battery: providing a power supply by the waste lithium iron phosphate battery, and electrolyzing a lithium precipitation mother solution by using a three-chamber diaphragm electrolytic bath; (2) crushing and sorting; (3) two-stage leaching: leaching the lithium iron phosphate positive electrode powder with a sulfuric acid solution generated by electrolysis of a lithium precipitation mother solution, and adding an aeration disc at the bottom of a reaction kettle for aeration; adding a dilute sulfuric acid solution generated by electrolysis of lithium precipitation mother liquor into first-section leaching residues for leaching; (4) two-stage impurity removal; and (5) preparing lithium carbonate. According to the method, the lithium precipitation mother liquor for the waste lithium iron phosphate battery is discharged to prepare the sulfuric acid and sodium hydroxide-lithium hydroxide mixed solution for production, so that residual electricity is utilized, a production reagent is saved, and the problems of high energy consumption, large lithium loss and poor sale of a byproduct sodium sulfate in evaporative crystallization of sodium sulfate are solved; and the aim of circularly and comprehensively utilizing the waste lithium iron phosphate battery is fulfilled.

The present application belongs to the technical field of flue gas purification, and discloses a kind of automatic adjusting device of denitration ammonia injection gate, including wind pressure sensing element, pressure regulating opening device, temperature feedforward regulating device on ammonia injection head, according to mechanical mode automatic adjusting ammonia injection gate opening, realize according to flue gas volume automatic adjusting the ammonia injection amount of each ammonia injection gate;Device realizes the automatic control and adjustment of on-site equipment, both meets the national environmental protection to thermal power plant NO x The emission requirement, also reduces the consumption of ammonia injection of power plant, for sulfur-containing coal, reduces the generation of sulfuric acid hydrogen ammonium, avoids the plugging and hardening problem of air preheater, dust collector and tail flue, does not increase flue resistance, does not increase the specific consumption of induced draft fan, and does not cause the problem of unit load limitation.

The application discloses a preparation and by-product recycling process of acesulfame potassium, and belongs to the technical field of food additive production and processing. Amino sulfonic acid is added into N-butyl pyridine hydrogen sulfate ionic liquid and triethylamine in batches to obtain a homogeneous mixed solution; secondly, the mixed solution and diketene are introduced into a micro-channel reactor to perform a condensation reaction; and the discharge liquid is introduced into a polystyrene sulfonic acid resin loaded SO3 fixed bed reactor to perform a cyclization reaction; subsequently, the cyclization product is subjected to hydrolysis, decolorization, potassium salt crystallization and drying to obtain the acesulfame potassium product; and the crystallization mother liquor is separated through a nanofiltration membrane, and the intercepted liquid is an ionic liquid and triethylamine mixture, which is directly reused. The application inhibits the self-polymerization of diketene through the micro-channel reactor, replaces concentrated sulfuric acid with solid acid to avoid waste acid pollution, and realizes efficient recycling of by-products by combining nanofiltration membrane separation and catalytic depolymerization technology, and has the characteristics of green environmental protection and economic efficiency.

The invention discloses a compound fertilizer for Cinnamomum longepaniculatum planting and a preparation method thereof, and belongs to the technical field of fertilizers. According to the preparation method disclosed by the invention, the cinnamomum longepaniculatum leaf residues, the crop straws, the bean dregs and the bone meal are used as raw materials, manganese ions and zinc ions are used as auxiliary materials, and the surfaces of final fertilizer particles are coated with potassium hydrogen acid, so that the finally obtained compound fertilizer can contain a large amount of nutrient substances which can be effectively absorbed by root systems of cinnamomum longepaniculatum, and the effect of improving the yield is achieved. Therefore, the activity of a key enzyme for synthesizing the cinnamomum longepaniculatum oil in the cinnamomum longepaniculatum is activated, the accumulation of the cinnamomum longepaniculatum oil in the leaves is promoted, and the cinnamomum longepaniculatum oil content in the cinnamomum longepaniculatum leaves The coated potassium hydrogen sulfate can release potassium ions and hydrogen sulfate ions, so that the content of potassium in the fertilizer is increased, most importantly, the soil acidity and alkalinity can be adjusted, and a fertilization area is weakly acidic, so that the absorption of the root system of the cinnamomum longepaniculatum on effective substances can be promoted, and the yield of the cinnamomum longepaniculatum is increased. The utilization rate of the fertilizer is increased; meanwhile, the content of the cinnamomum longepaniculatum oil in the cinnamomum longepaniculatum leaves can be

The present application relates to the technical field of catalyst regeneration, and discloses a regeneration method of deactivated denitration catalysts. The regeneration method comprises the following steps: (1) performing at least one heat treatment on the deactivated denitration catalyst monomer; (2) placing the deactivated denitration catalyst monomer after heat treatment in an electrolyte solution for electrochemical treatment, and then performing rinsing; (3) placing the deactivated denitration catalyst monomer after rinsing in a mechanical reinforcement solution and an active component supplement solution in sequence for impregnation; and (4) performing oxidation calcination on the deactivated denitration catalyst monomer after impregnation, and then performing reduction. The method can perform overall regeneration on the deactivated denitration catalysts caused by metal elements such as Fe, Pb, Cu and As, organic matters such as COD, and hydrogen sulfate ammonium type miscellaneous salts, the regenerated denitration catalyst obtained can maintain the integrity of the structure, has higher mechanical strength and catalytic activity, and can be directly put into use.

The present invention provides a porous hard carbon negative electrode material and its preparation method and sodium ion battery, relating to the technical field of sodium ion batteries; the preparation method comprises the following steps: a template, a hard carbon precursor, an activator and 1-ethyl-3-methylimidazole hydrogen sulfate are evenly ground to obtain a mixture; the mixture is heated to 700-900°C in an inert gas atmosphere to obtain a carbonized material; the carbonized material is subjected to secondary pore formation to obtain a porous carbonized material; the porous carbonized material is washed and dried, and then immersed in a polyoxometalate sodium salt solution to obtain a soaked material; the soaked material is washed and dried, and the dried material is heated to 1200-1400°C in an inert gas atmosphere to obtain a porous hard carbon negative electrode material. The present invention introduces active sites into the porous carbon material during the carbonization process, and then introduces polyoxometalate sodium salt on the active sites. The polyoxometalate skeleton in the polyoxometalate sodium salt can allow sodium ions to be transmitted in its micropores, thereby improving the gram capacity and coulombic efficiency of the material.

The utility model relates to the technical field of powder packaging, in particular to a powder dredging structure of potassium hydrogen persulfate compound powder filling equipment, which comprises filling pipes arranged at the lower ends of filling barrels and supplementing barrels, and the filling pipes are fixedly connected with the respective filling barrels or supplementing barrels through connecting parts; a scraping plate is slidably connected to the inner wall of the filling pipe, the top of the scraping plate is arranged in the connecting part, and a driving mechanism is further arranged in the connecting part and used for driving the scraping plate to rotate along the inner wall of the filling pipe. And a scraping plate is arranged in the filling pipe and is in sliding connection with the inner wall of the filling pipe. After filling is completed every time, the scraping plate rotates by a circle along the inner wall of the filling pipe, so that the potassium hydrogen sulfate compound powder remaining on the inner wall of the filling pipe can be effectively scraped off, and the potassium hydrogen sulfate compound powder falls into a potassium hydrogen sulfate compound powder packaging box. Not only is waste avoided, but also the problem of residual potassium hydrogen sulfate compound powder in the filling pipe is effectively solved, and meanwhile, the residual potassium hydrogen sulfate compound powder is prevented from drifting everywhere.

Disclosed is an alkali metal ion conductor which behaves as a liquid at a low temperature. The alkali metal ion conductor of the present disclosure is an alkali metal ion conductor comprising a salt, wherein the salt comprises a first cation, a second cation, and a first anion, the first cation is a tetraalkylammonium ion having an alkyl chain length of 5 or more, the second cation is an alkali metal ion, and the first anion is at least one anion selected from the group consisting of a bromine ion, a chlorine ion, and a hydrogen sulfate ion.

The invention relates to the technical field of superconducting material surface treatment, and particularly discloses an electrochemical polishing solution for a superconducting niobium material and application of the electrochemical polishing solution. The polishing solution is formed by mixing 98wt% of concentrated sulfuric acid, 40wt% of hydrofluoric acid and absolute ethyl alcohol according to the volume ratio of 5: 1: 1. Compared with a traditional 9: 1 binary system, absolute ethyl alcohol is introduced to serve as a key third component, the acid-base ratio is optimized, and a ternary synergistic system is constructed. The absolute ethyl alcohol plays multiple functions of inhibiting pitting corrosion, improving the wettability and mass transfer process, controlling reaction kinetics and the like in a system, and has a synergistic effect with the adjusted acid proportion, so that the problems that pitting corrosion is easy to generate, the surface uniformity is poor and a process window is narrow in a traditional formula are effectively solved. The polishing solution is particularly suitable for carrying out 30-second short-time efficient polishing on the superconducting niobium plate under the condition of 15V direct-current voltage, and a pitting-corrosion-free and low-roughness ultra-smooth surface can be stably obtained.

The application relates to a preparation method of esconazole sulfate. The method comprises realizing esconazole salt type conversion through nanofiltration in the presence of sulfate and / or hydrogen sulfate ions, and obtaining esconazole sulfate of formula I. The esconazole salt type conversion method is short in steps, simple in operation, low in cost, high in purity and yield, and easy to realize industrial production.

The present invention belongs to the field of oil production technology, and in particular to a nitrogen foam cement slurry system and its preparation method and application. The preparation method is as follows: 2-aminoethanol hydrogen sulfate, solvent, and 2-bromododecanoic acid are added to the reactor, stirred evenly, heated to reflux, and adjusted and maintained at a pH of 8-9 with sodium hydroxide; vacuum distillation obtains a viscous liquid, which is recrystallized with cyclohexane to obtain a solid, dried, and a foaming agent is obtained; the foaming agent, foam stabilizer, and tap water are stirred evenly in proportion to obtain an aqueous phase; the above-mentioned aqueous phase is added to a foam cement slurry stirring cup, stirred at a low speed in a nitrogen atmosphere, and a strength retainer and G-grade oil well cement are added to obtain a cement slurry; the above-mentioned cement slurry is stirred at a high speed to obtain a nitrogen foam cement slurry system. The nitrogen foam cement slurry system of the present invention has the characteristics of small density difference and high strength.

The invention discloses an S-NPK production system and method.The S-NPK production system comprises an acid mixing tank, a tubular reactor, a neutralizing tank, a granulation drying machine, a classifying screen and a crusher, potassium hydrogen sulfate and phosphoric acid are mixed in the acid mixing tank to prepare mixed acid, the mixed acid reacts with ammonia, then slurry is prepared in the neutralizing tank again, and then the mixed acid reacts with the ammonia to prepare the S-NPK. And spraying the slurry into a granulating and drying machine by using a slurry spray gun for granulating and drying, screening granular materials in the granulating and drying machine, and taking qualified materials after screening as a target product, namely S-NPK. According to the invention, potassium bisulfate with relatively low cost is used for replacing potassium sulfate with high energy consumption, pollution and selling price to produce chlorine-free high-concentration S-NPK, phosphoric acid and slurry do not need to be concentrated, the external return material ratio is low, the nutrient content is complete, the defects of single-nutrient or dual-nutrient fertilizer are overcome, the problem that the fertilizer application requirement of crops is not met is solved, the fertilizer application workload is reduced, the crop yield is increased, and the economic benefit is increased. The fertilizer application effect is improved.

This invention provides a method for recovering lithium from lithium-containing aluminum electrolyte waste, relating to the field of lithium-containing waste resource utilization. The lithium-containing aluminum electrolyte waste is mixed with a calcium-containing substance and roasted. The calcium-containing substance includes a first calcium-containing substance and a second calcium-containing substance. The first calcium-containing substance is at least one selected from calcium sulfate, calcium bisulfate, calcium carbonate, or calcium bicarbonate. The second calcium-containing substance is at least one selected from calcium carbonate, bicarbonate, sulfate, bisulfate, hydroxide, oxide, or chloride. The molar ratio of calcium in the calcium-containing substance to aluminum in the lithium-containing aluminum electrolyte is controlled at 1-4:1. The molar amount of calcium in the carbonate, bicarbonate, sulfate, and bisulfate is 40%-80% of the total molar amount of calcium in the calcium-containing substance. After roasting, the roasted clinker is mixed with an acidic leachate for lithium extraction. This method significantly improves the lithium leaching rate and effectively and selectively recovers high-value lithium from lithium-containing aluminum electrolytes.

The utility model relates to potassium hydrogen sulfate composite powder processing technical field, concretely relates to a kind of potassium hydrogen sulfate composite powder premixing mechanism, including support seat, the potassium hydrogen sulfate composite powder premixing mechanism further includes: cradle is rotationally arranged on the support seat, mixing tank is rotationally arranged in the cradle, the drive part for driving mixing tank autorotation, several helical blades are fixed in the mixing tank inside circumferentially uniformly, and the mixing area is formed by surrounding between adjacent two helical blades.The utility model can autorotate mixing tank under the driving of drive part after raw material is filled and tightened can cover, and cradle is reciprocatingly deflected along mixing tank axial under the driving of reciprocating driving element, so that raw material flows, rolls mixing in mixing tank, greatly weaken the collision, vibration degree in mixing process of raw material, improve mixing effect.

The present disclosure relates to an improved method to produce hydrofluoric acid from an aqueous sulfuric acid–hydrofluoric acid solution. Aspects of the disclosure are directed to a method where forced circulation under pressure is used to generate a hot liquid stream that is vaporized to produce a hydrofluoric acid vapor–water vapor stream comprising essentially only water and HF. Additionally, there may be a liquid recycle.

This application provides a method for recycling lithium-aluminum-silicon glass waste, relating to the field of solid waste resource utilization. The method includes: mixing lithium-aluminum-silicon glass waste powder with additives, calcining to obtain a calcined material, wherein the additives include sodium and calcium salts, the sodium salt including at least one of sodium sulfate and sodium bisulfate, and the calcium salt including at least one of calcium sulfate and calcium bisulfate. The molar amount of calcium in the additives is more than 0.4 times the molar amount of aluminum in the lithium-aluminum-silicon glass waste, and the molar amount of sodium is more than 0.9 times the molar amount of aluminum in the lithium-aluminum-silicon glass waste. The calcined material is then mixed with a leaching agent for leaching. The lithium-containing leaching solution of this application contains few types and amounts of impurities, and high-purity lithium compounds can be prepared after simple impurity removal treatment. This enables efficient recovery and reuse of valuable elements in low-value lithium-aluminum-silicon glass waste, solving the environmental pollution problem caused by glass waste stockpiling and reducing space occupation.

The invention provides a high-potential potassium hydrogen persulfate substrate modified sheet and a preparation method thereof, and relates to the field of substrate modified sheets. Comprising the following components in parts by weight: 10-30 parts of potassium hydrogen persulfate composite salt, 2-3 parts of potassium hydrogen sulfate, 2-5 parts of potassium sulfate, 1-3 parts of sodium chloride, 1-3 parts of polyethylene glycol 60001, 1-3 parts of polyvinylpyrrolidone, 1-3 parts of magnesium sulfate, 3-5 parts of lauryl sodium sulfate, 4-10 parts of sodium metaphosphate and 30-60 parts of sodium sulfate. The invention also provides a method for preparing the high-potential potassium hydrogen persulfate substrate modified sheet. According to the invention, slow dissolution of drugs in a water body is realized through an inclusion technology, active peroxy ions are continuously released, long-acting oxygenolysis of sediment organic matters is ensured, and the continuous demand of an aquaculture environment on sediment improvement is met.

The invention relates to a molecular resist composition and a pattern forming method. The present invention addresses the problem of providing: a molecular resist composition having excellent sensitivity, resolution, and LWR in optical lithography using high-energy rays; and a pattern forming method using the molecular resist composition. The present invention is a molecular resist composition characterized by containing a sulfonium salt represented by the following formula (1) or (2), a salt containing a cation represented by the following formula (1-1) and a halide ion, a nitrate ion, a hydrogen sulfate ion, a bicarbonate ion, a tetraphenylborate ion or an anion represented by any one of the following formulae (1-2)-(1-8), and an organic solvent, and no base polymer is contained.

To provide a wire electric discharge machine that can extend a service life of a filter 32, even when subjecting an aluminum-based material to electric discharge machining.SOLUTION: A wire electric discharge machine (10) according to an embodiment in the disclosure subjects an aluminum-based material to electric discharge machining. A processing liquid used for electric discharge machining in the wire electric discharge machine includes one or more cations selected from potassium ions, calcium ions, sodium ions, and magnesium ions, and one or more anions selected from sulfate ions, sulfite ions, disulfite ions, hydrogen sulfite ions, hydroxide ions, nitrate ions, and nitrite ions.SELECTED DRAWING: Figure 1

The invention provides a preparation method of high-purity bis (3-ethyl-5-methyl-4-maleimidophenyl) methane, and belongs to the technical field of polymer synthesis, and the preparation method comprises the following steps: reacting diamine with maleic anhydride in an organic solvent to obtain bismaleamic acid, and carrying out dehydration by taking inorganic acid or inorganic acid salt as a dehydration catalyst to obtain the high-purity bis (3-ethyl-5-methyl-4-maleimidophenyl) methane. The preparation method comprises the following steps: carrying out dehydration ring-closure reaction on bismaleamic acid to prepare bis (3-ethyl-5-methyl-4-maleimidophenyl) methane; the inorganic acid is phosphoric acid, nitric acid or sulfuric acid, and the inorganic acid salt is sodium hydrogen sulfate or sodium dihydrogen phosphate; the dosage of the organic solvent is not more than 6 times of the equivalent weight of diamine. The high-purity bis (3-ethyl-5-methyl-4-maleimidophenyl) methane is prepared by adopting an inorganic acid catalysis system and a low-temperature dehydration process, so that the problems of organic catalyst residue, excessive solvent, bottleneck of product purity, overhigh process temperature, chromatic aberration of the product, limited application field and the like are solved, and the yield and purity of the product are improved.

The invention belongs to the technical field of ion detection, and particularly relates to a preparation method of a long-wavelength emission fluorescent probe for rapidly detecting bisulfite, which comprises the following steps: dissolving isophorone and malononitrile in ethanol to obtain a product 1; 3-bromoquinoline and 5-formyl-2-thiopheneboronic acid are dissolved in a mixed solvent of dry methanol and dry toluene, and a product 2 is obtained; dissolving the product 2 in dichloromethane, and adding methyl trifluoromethanesulfonate to obtain a product 3; and dissolving the product 1 and the product 3 in ethanol, and adding piperidine to obtain the required fluorescent probe LSQ. Dissolving the obtained fluorescent probe LSQ in DMSO to prepare mother liquor A; a target product is obtained. The fluorescent probe provided by the invention has the advantages of high-selectivity rapid response to bisulfite, long-wavelength emission, no organic solvent detection, simple synthesis route and simple and convenient detection equipment and method, and can be used for qualitative and quantitative detection of bisulfite in food and biological systems.

This invention proposes a method for recycling waste lithium titanate anode materials, comprising the following steps: S1: The recycled lithium titanate anode material is calcined once, and the resulting calcined material is mixed with a mixture containing an acidic salt and an additive under pressure. After the reaction, solid-liquid separation is performed to obtain a lithium extraction solution and a leaching residue; wherein, the acidic salt is at least one of a hydrogen sulfate or an ammonium salt; the additive is at least one of barium chloride or calcium chloride; the reaction pressure is 0.3~0.6 MPa. After pressurized selective leaching of the lithium titanate anode material, the lithium extraction solution can be purified to obtain battery-grade lithium carbonate products, and the leaching residue can be used to prepare high-value-added titanium-based adsorbent precursors.

The invention discloses a micromolecular oil-based gel breaker as well as a preparation method and application thereof, and belongs to the technical field of product oil pipeline maintenance. The micromolecular oil-based gel breaker is selected from one or two of the following effective components in parts by weight: 1-10 parts of triethanolamine, 1-10 parts of sodium persulfate, 1-10 parts of sodium hydrogen sulfate and 1-10 parts of sodium sulfite, and 80-100 parts of water is used as a solvent. Compared with the existing gel breaker, the small molecule oil-based gel breaker has the advantages that the gel breaking time is shortened by 30-50%, and the shortest time can reach 15 minutes; by using weak acid and weak base, the corrosion to the carbon steel pipeline is low; meanwhile, the gel breaker mainly aims at phosphate aluminum salt gel and alkyl phosphate gel left in the pipeline, depends on the acid-base effect and the oxidation-reduction effect to act respectively or achieve the chemical synergistic effect, the formula of the gel breaker can be selected according to actual requirements, and the pertinence is high; the gel breaker provided by the invention also has the advantages of excellent environmental friendliness and controllable cost.

The present invention relates to the technical field of boiler equipment, and specifically discloses a boiler hot air preheating device, comprising a rotary air preheater arranged on the flue at the rear of the boiler, and a control device connected to the rotary air preheater; wherein the control device is used to control and adjust the rotation speed of the rotary air preheater according to the primary hot air temperature, secondary hot air temperature and flue gas temperature of the boiler collected in real time, so that the outlet flue gas temperature of the rotary air preheater is greater than the melting point temperature of ammonium bisulfate. In this application, based on the temperature requirements of the boiler for the primary hot air and secondary hot air, and the actual flue gas temperature discharged from the flue of the boiler, the rotation speed of the rotary air preheater is controlled so that the temperature of the flue gas is maintained at a temperature greater than the melting point temperature of ammonium bisulfate, thereby avoiding the problem of ammonium bisulfate precipitating and scaling inside the rotary air preheater, which is beneficial to improving the service life and performance of the rotary air preheater.

A method for producing ammonium nitrate includes a nitrogen dioxide recovery step of bringing nitrogen dioxide in a cement exhaust gas into contact with water to obtain an NOx-containing solution, a reduction reaction step of producing ammonia by bringing a reducing catalyst into contact with the NOx-containing solution, an ammonia recovery step of vaporizing the ammonia with a waste heat gas, a solid-liquid separation step of separating a residue after the ammonia recovery into iron hydroxide and an unused residue of NOx, a neutralization step of bringing the separated nitrate / nitrite nitrogen-containing solution and the NOx-containing solution into contact with the ammonia vaporized and recovered to prepare ammonium nitrate, and a catalyst production step in which magnetite used in the reduction reaction step is obtained by reacting iron sulfate with a sodium hydroxide aqueous solution and separating the mixture into solid and liquid, the sodium sulfate aqueous solution in the solid-liquid separation is separated into sodium hydroxide and sulfuric acid by electrodialysis, and the sodium hydroxide is used in a circulatory manner for preparing the magnetite, where the nitrogen dioxide in the cement exhaust gas is treated simply and efficiently while reducing environmental burden.

Disclosed is a synthetic method of sulfamerazine, relating to the technical field of drug preparation. Acetone and methyl formate are used as initial raw materials, and subjected to condensation reaction to obtain a compound 2; the compound 2 is subjected to addition reaction in a medium of methyl hydrogen sulfate to obtain a compound 3; the compound 3 is subjected to cyclization reaction in a medium of sulfaguanidine to obtain a compound 4; and the compound 4 is subjected to acidification in an acidic medium to obtain the sulfamerazine.

The present application relates to a kind of lignocellulose efficient pretreatment method, lignocellulose is loaded into stirred tank, after adding calcium bisulfite stirring uniformly, it is sent to reactor by feeder.Low-pressure steam is introduced to carry out steam explosion, and material is separated by cyclone separator and is sent to hydrolysis kettle for hydrolysis.After steam is sprayed, it is recycled by steam return air duct, and is used for the heating of pipeline and hydrolysis kettle.The present application can significantly improve the pretreatment effect of lignocellulose using calcium bisulfite as accelerator: reaction temperature is low, energy is saved, and the generation of enzymatic hydrolysis and fermentation inhibitor is reduced;The solid content of pretreatment liquid is high, more conducive to large-scale production;And calcium bisulfite is converted into calcium sulfate precipitate after pretreatment, and additional detoxification treatment is not needed.Lignocellulose raw material pretreated using the method is used for simultaneous saccharification and fermentation to produce lactic acid, and the lactic acid concentration in fermentation broth can reach 98 g / L, and the lactic acid yield can reach 42.4 g / 100g lignocellulose.