104 results about "Sulfurous acid" patented technology

The invention discloses a method for preparing erythritol bicyclic ethylene sulfate through efficient catalysis, which comprises the following steps: reprocessing a commercially available titanium silicalite molecular sieve, and reacting intermediate erythritol bicyclic ethylene sulfite (BES) and hydrogen peroxide under the action of a self-made catalyst to obtain the target product erythritol bicyclic ethylene sulfate (BDTD), the yield is 88%; and the obtained product is recrystallized to obtain the product with the purity of more than 99.5%, and the solvent and the catalyst used in the process can be recycled. The raw materials and auxiliary materials are commercially available, low in price and easy to obtain, the reaction yield is high, the product purity is high, the process cost is low, and the method is environmentally friendly, suitable for industrialization and extremely high in social use value and application prospect.

The technology includes a method for removing sulfur dioxide (SO2) from a gas stream, where SO2 gas is contacted by a diluted sulfuric acid (H2SO4) stream and absorption takes place in a quench tower. The dissolved SO2 reacts with the excess of oxygen in the gas stream, where the oxidation results in the formation of sulfurous acid (H2SO3) and dilute H2SO4. For the complete oxidation of the dissolved SO2, an electrolyzer and / or liquid injectants are used. This results in the formation of diluted H2SO4. The diluted H2SO4 is processed in an enrichment unit to produce concentrated H2SO4 and fresh water. A portion of the diluted H2SO4 and / or fresh water is recycled back to the quench tower for the continued acidic absorption of the incoming SO2 in the gas stream, thereby not relying on an external water source.

Provided herein are methods and systems for treating a sulfur dioxide-containing gaseous stream. The method includes combusting a tail gas in an excess of oxygen gas to yield a thermal oxidizer effluent containing sulfur dioxide and oxygen. The thermal oxidizer effluent is introduced to an oxidative catalytic converter to convert sulfur dioxide to sulfur trioxide, thereby forming an oxidized gas stream. The oxidized gas stream is routed to a quench tower and contacted with a dilute aqueous acid quench stream to yield sulfurous acid, hydrated sulfur dioxide, or both. The sulfurous acid or hydrated sulfur dioxide is oxidized with the excess of oxygen from the thermal oxidizer effluent to yield sulfuric acid.

The utility model discloses a countercurrent absorption device for sulfurous acid, which consists of a process water pipe, a tail gas fan, a third-stage absorption tower, a second-stage absorption tower, a shower nozzle, a first-stage absorption tower, a finished product acid pump, a sulfur furnace, a circulating acid pump and a baffle plate. According to the sulfur dioxide absorption tower disclosed by the invention, the problems that sulfur dioxide gas is not thoroughly absorbed and tail gas pollutes the environment in a sulfurous acid preparation process are solved by adopting countercurrent absorption of the flow direction of sulfur dioxide gas and the flow direction of process water and adopting an absorption mode of combining a shower nozzle and baffle plate water distribution; the sulfur dioxide gas absorption efficiency is high, and equipment and power energy are saved.

This invention discloses a process for preparing high-purity vinyl sulfite using a jet-type loop reactor. Based on the jet-type loop reactor, it employs multiple catalytic systems, using ethylene oxide and sulfur dioxide as raw materials, combined with relevant solvents. This invention relates to the field of vinyl sulfite technology. This process for preparing high-purity vinyl sulfite using a jet-type loop reactor enhances gas-liquid mass transfer through an external circulation jet-type loop reactor. Combined with optimized raw material pretreatment, the reaction cycle is shortened to 2.5-3.0 hours, improving efficiency by more than 50% compared to batch processes. The entire process is continuous, with equipment utilization exceeding 85%, suitable for large-scale production of tens of thousands of tons per year. It addresses the shortcomings of existing processes in terms of scalability, achieving high production efficiency and significant scalability advantages. Furthermore, the entire process is a closed loop, preventing sulfur dioxide leakage. Excess sulfur dioxide is recovered, and solvents are recycled, reducing pollutant emissions by more than 80%.

The invention relates to a method for preparing ethylene sulfate, which comprises the step of performing catalytic oxidation reaction on ethylene sulfite under the action of a nitrogen oxide catalyst in an oxidizing gas atmosphere containing oxygen to obtain an ethylene sulfate product in one step. Wherein the oxidizing gas containing oxygen is first mixed gas of oxygen and nitrogen, and based on the total volume of the first mixed gas, the volume fraction of the oxygen is 20-80%. The method disclosed by the invention is green and environment-friendly, low in cost, high in selectivity, safe to operate and simple in process.

The invention discloses a method and a device for rapidly measuring the concentration of various inorganic anions in water. According to the method, rapid and high-precision colorimetric detection of eight ions such as fluorine ions, chloride ions, nitrite ions, bromide ions, nitrate ions, phosphate radicals, sulfite radicals and sulfate radicals is realized by adopting a reaction strategy of adding a color developing auxiliary agent and a specific color developing agent step by step and combining with step-by-step uniform mixing and optimizing a reagent combination, a concentration ratio and a reaction time sequence aiming at different target ions. The device comprises a sample groove, a multi-cavity color developing agent bin, a color developing auxiliary bin, a reaction tank, a liquid path conveying module, an image acquisition module and a control module which are integrated in a shell. Through deep integration of a chemical system and an automatic process, the problems of cross interference, poor color development stability, complicated operation and the like in multi-index detection of portable equipment are solved, and the method has the advantages of high detection speed, high accuracy, strong anti-interference performance, easiness in carrying and simplicity and convenience in operation.

The present application relates to a high concentration of ammonium bisulfite preservation solution, the preservation solution components include ammonium bisulfite and ethanol, the concentration of ammonium bisulfite is about 13 mol / L to about 15 mol / L, the concentration of ethanol is about 0.3 mol / L to about 1.5 mol / L. The present application also provides a method and kit for preserving high concentration of ammonium bisulfite solution.

Provided are: a gold plating method for achieving soft gold plating; a composition for gold plating; and a plating solution. The gold plating method is performed using a plating solution comprising: a gold sulfite salt; and at least one among thiosulfate ions and trithionic acid ions.

The invention relates to a continuous preparation method of pentaerythritol bisulfite, which comprises the following steps: respectively and continuously introducing pentaerythritol emulsion and thionyl chloride into a continuous flow oscillation stirring reactor for continuous flow reaction, controlling the reaction temperature to be 40-90 DEG C, controlling the temperature to be 40-90 DEG C, and controlling the reaction time to be 1-3 hours; the stirring rotating speed is 200 to 800 r / min, the reaction pressure is 0.3 to 0.8 MPa, and the reaction time is 30 to 120 minutes. By using the continuous flow oscillation stirring reactor and specific reaction conditions, the continuous preparation is realized, and the pentaerythritol conversion rate, the product yield and purity, the reaction efficiency and the post-treatment simplicity are considered at the same time. The method has the remarkable advantages of simple process, low reaction operation difficulty, high reaction efficiency and the like, and can meet the comprehensive requirements of large-scale continuous industrial production on efficiency, cost and product quality.

The application discloses a ferrous sulfate high-temperature crystallization production device and a production method, which comprise a temperature adjusting tank, an energy-saving mechanism is arranged outside the temperature adjusting tank, the energy-saving mechanism comprises a heat pump and a water storage tank, the inside of the heat pump and the inside of the water storage tank are connected through two circulating pipes, water pipes are connected through both sides of the inside of the water storage tank, connecting pipes are connected through both sides of the inside of the heat pump, one end of the connecting pipe is connected with a spiral pipe through a flange, the spiral pipe is arranged on the outer surface of the temperature adjusting tank, and a condenser pipe is fixedly connected through the outer surface of the spiral pipe, and the application relates to the technical field of ferrous sulfate production devices, solves the problem that in the production process of the existing ferrous sulfate high-temperature crystallization production device, steam generated by flash evaporation and heat energy lost by concentrated raw material liquid cooling are directly lost in the external air, heat is wasted, and the energy-saving and environmental protection concept is not met.

Provided herein are methods and systems for treating a sulfur dioxide-containing gaseous stream. The method includes combusting a tail gas in an excess of oxygen gas to yield a thermal oxidizer effluent containing sulfur dioxide and oxygen. The thermal oxidizer effluent is introduced to an oxidative catalytic converter to convert sulfur dioxide to sulfur trioxide, thereby forming an oxidized gas stream. The oxidized gas stream is routed to a quench tower and contacted with a dilute aqueous acid quench stream to yield sulfurous acid, hydrated sulfur dioxide, or both. The sulfurous acid or hydrated sulfur dioxide is oxidized with the excess of oxygen from the thermal oxidizer effluent to yield sulfuric acid.

The application discloses a multi-sulfur-based heavy metal removal agent for steel plant ash washing wastewater, a preparation method thereof and a method for treating ash washing wastewater by using the same, and high-purity potassium chloride is produced by using high-salt solid waste ash generated by a steel enterprise. Meanwhile, based on the characteristics of the high-salt solid waste ash, such as high thallium, ammonia nitrogen and sulfate radical concentration in the water washing wastewater, a deep thallium removal idea based on weak reduction and complexation breaking, same ion effect precipitation and chelation thallium removal is first proposed, the multi-sulfur-based heavy metal removal agent is used to realize deep removal of thallium in the high-salt wastewater, and combined with the characteristics of the sintering flue gas purification and acid wastewater containing a large amount of sulfite ions and low acidity, the multi-sulfur-based heavy metal removal agent is used for removing sulfur, removing ammonia nitrogen and removing thallium in the ash washing wastewater, and the countercurrent evaporation and potassium and sodium separation are used for the synergistic effect, so that the collaborative treatment and resource utilization of the high-salt solid waste ash and the acid wastewater of the steel plant are realized, and the quality of the recovered potassium salt is greatly improved. Meanwhile, the technical scheme provided by the application also has the advantages of simple process conditions, low energy consumption, no wastewater discharge and the like.

A sulfuric acid system for burning sulfur, comprising a sulfur temporary storage tank, a gasification igniter, a sulfur combustion chamber, a Venturi injector, a reactor, an acid making tower, an alkali washing tower, the sulfur temporary storage tank is connected with the gasification igniter through a sulfur metering pump, the gasification igniter is connected with the sulfur combustion chamber, the sulfur combustion chamber is connected with the gas chamber of the Venturi injector through a pipeline I, the bottom end of the Venturi injector is connected with the inlet of the reactor through a reaction tube, the gas outlet of the reactor is connected with the gas inlet of the acid making tower through a pipeline III, the liquid outlet of the acid making tower is connected with the liquid chamber of the Venturi injector through a pipeline IV, the liquid outlet of the reactor is connected with a sulfurous acid storage tank through a pipeline V, the upper gas outlet of the acid making tower is connected with the gas inlet of the alkali washing tower through a pipeline VI, the two liquid inlets of the alkali washing tower are connected with alkali liquor and water through control valves respectively, and a circulating pipeline and an alkali washing tower circulating pump are connected between the lower liquid outlet of the alkali washing tower and the upper liquid inlet of the alkali washing tower. The utility model can improve the raw material utilization rate, reduce the acid making cost and reduce pollution.

The invention discloses a system and a method for preparing methanol by coupling mixed sulfur circulating hydrogen production with carbon capture. The system comprises a flue, a booster fan, a sulfur dioxide absorption device and the like, the method comprises the following steps: introducing sulfur-containing flue gas subjected to boiler denitration and dust removal into a sulfur dioxide absorption device; atomizing and spraying water to the top of the absorption device, fully contacting sulfur dioxide in the flue gas and return liquid of the electrolyte collection device, and reacting to generate a mixed solution of sulfurous acid and sulfuric acid; indissolvable nitrogen and carbon dioxide in the flue gas enter a flue gas discharging device; hydrogen separated out from the cathode of the electrolysis device enters a hydrogen collection tank, and a sulfuric acid solution generated from the anode enters an electrolyte collection device; part of solution in the electrolyte collection device returns to the absorption device for cyclic utilization, and part of high-concentration sulfuric acid is collected; gas in the flue gas discharging device enters the deoxidizing device; the deoxygenated gas and residual hydrogen enter a methanol preparation device, and methanol is generated under the action of a catalyst. Waste gas resource utilization is achieved, and hydrogen production energy consumption is reduced.

The utility model discloses a device for absorbing sulfur dioxide in waste gas of a tube bundle dryer. The device mainly comprises an absorption tower, a gas inlet pipe, a gas outlet pipe, a liquid inlet pipe, a liquid outlet pipe, a distributor, a water collector, an induced draft fan, a baffle plate, a sulfurous acid concentration detector, a centrifugal pump, a water replenishing valve, a discharge outlet and a liquid level meter. According to the absorption principle, the problem that the content of sulfur dioxide in discharged waste gas is high is solved through a countercurrent flow heat exchange absorption method, the environment is protected, meanwhile, the purposes of reducing consumption and improving efficiency are achieved, and sulfur consumption is reduced.

The application provides a battery monomer and a power device, the battery monomer comprising a positive pole sheet, a negative pole sheet and an electrolyte, the electrolyte comprising a first additive and a second additive, the first additive comprising a sulfonic anhydride compound, and the second additive comprising one or more of a sulfuric ester compound, a sulfurous acid ester compound and a sulfonic acid ester compound, wherein the difference between the reduction potential of the first additive relative to Li + and the reduction potential of the second additive relative to Li + is 0.2V-1.5V.

The present invention relates to: [1] a method for manufacturing silica microcapsules, the silica microcapsules having a shell containing silica as a constituent component and a core containing one or more organic compounds, the manufacturing method comprising the following steps: in the presence of one or more sulfur-containing ions selected from sulfate ions, sulfite ions and sulfonic acid ions, an emulsion is supplied to a sol-gel reaction to form silica microcapsules, wherein the emulsion is obtained by emulsifying an aqueous phase component containing a cationic surfactant and an oil phase component containing one or more organic compounds and a silica source; [2] an aqueous dispersion containing silica microcapsules, the silica microcapsules having a shell containing silica as a constituent component and a core containing one or more organic compounds, the total content of sulfate ions, sulfite ions and sulfonic acid ions in the aqueous dispersion being 10 to 500 ppm.

The technology includes a method for removing sulfur dioxide (SO2) from a gas stream, where SO2 gas is contacted by a diluted sulfuric acid (H2SO4) stream and absorption takes place in a quench tower. The dissolved SO2 reacts with the excess of oxygen in the gas stream, where the oxidation results in the formation of sulfurous acid (H2SO3) and dilute H2SO4. For the complete oxidation of the dissolved SO2, an electrolyzer and / or liquid injectants are used. This results in the formation of diluted H2SO4. The diluted H2SO4 is processed in an enrichment unit to produce concentrated H2SO4 and fresh water. A portion of the diluted H2SO4 and / or fresh water is recycled back to the quench tower for the continued acidic absorption of the incoming SO2 in the gas stream, thereby not relying on an external water source.

The invention relates to the technical field of surface treatment, in particular to a plating solution and process for cyanide-free gold electroplating, and the plating solution for cyanide-free gold electroplating comprises sodium gold sulfite, sodium sulfite, sodium thiosulfate, triammonium citrate, thiourea and organic amine compounds. The plating solution adopts a cyanide-free plating solution system, so that the environmental protection property is improved. Importantly, an organic amine compound serving as a welding binding agent is added into the plating solution, amino containing lone pair electrons is contained in the molecular structure of the organic amine compound and has a strong polarity adsorption effect, and the amino and active sites on the surface of a gold plating layer are subjected to a coordination reaction in the subsequent gold plating process, so that the bonding effect is improved. And monomolecular layer adsorption films which are arranged in order are formed on the surface of the plating layer by means of intermolecular Van der Waals force, so that non-uniformity of surface energy is corrected, and unstable high surface energy is converted into stable, uniform and controllable surface energy. And meanwhile, the surface is cleaned, impurities are removed, the interface reaction is regulated and controlled, the wettability of the welding flux on the surface of the plating layer is enhanced, and the welding flux can be rapidly spread in the welding process to form a continuous and uniform welding flux layer.

This invention discloses a method and system for recovering high-purity potassium bicarbonate and potassium sulfate from dust collected during blast furnace ferromanganese smelting. It proposes for the first time a technical route for recovering potassium bicarbonate and potassium sulfate by washing blast furnace ferromanganese smelting dust. Addressing the characteristics of the ash washing wastewater, pre-oxidation coupled with reduction impurity removal achieves efficient removal of sulfite and high-valence iron and manganese ions without introducing new impurities, significantly improving the purity of the recovered potassium salts. Secondly, considering the difficulty and cumbersome operation of separating carbonate, sulfate, and chloride ions, and taking into account the carbon dioxide consumption required for potassium bicarbonate preparation, the invention employs acid hydrolysis of carbonates to recover carbon dioxide, recycling carbon, and controlling the liquid-phase anion composition to co-produce high-purity potassium bicarbonate and potassium sulfate, reducing the cost of bicarbonate recovery and the difficulty of salt separation. Simultaneously, it achieves zero emissions of wastewater and waste gas.

The invention discloses a method for removing iron from crude nickel sulfate, and belongs to the technical field of byproduct treatment in the copper electrolysis process. The method for removing iron from the crude nickel sulfate comprises the following steps: carrying out reduction reaction on the crude nickel sulfate and a composite reducing agent in an aqueous solution to reduce ferric iron into ferrous iron; the composite reducing agent comprises sulfurous acid and ascorbic acid; adding Ni3 (PO4) 2 to coat the FeOOH seed crystal, and then heating to oxidize and precipitate iron; and filtering to obtain an iron-removed nickel sulfate solution. According to the method, deep iron removal and low nickel loss of the crude nickel sulfate solution are synergistically realized through a synergistic reduction mechanism of a sulfurous acid and ascorbic acid composite reducing agent and by coating the FeOOH seed crystal with Ni3 (PO4) 2, the nickel content in the precipitated iron slag can be reduced to 0.1 wt% or below, and the Fe content in the refined nickel sulfate can be reduced to 0.0004 wt% or below.

The invention discloses a method for efficiently reducing elemental selenium from selenium-containing leachate based on ferrous sulfate, which comprises the following steps: taking the selenium-containing leachate obtained by oxidation and acid leaching, and adjusting the acidity of the leachate to 0.5-1.1 mol / L; ferrous sulfate is added into the acid-adjusted selenium-containing leachate according to the liquid-solid ratio of 2 mL: (1.0-1.4) g for a reduction reaction, the reduction reaction temperature ranges from 70 DEG C to 90 DEG C, the reduction reaction time ranges from 40 min to 80 min, and a reaction product I is obtained; and separating the precipitate of the reaction product I, washing and drying to obtain the elemental selenium. According to the method disclosed by the invention, the elemental selenium is extracted by reducing the selenium-containing leachate by adopting ferrous sulfate, and the reduction rate of selenium can reach 91% or above under limited conditions; under optimized conditions, the selenium reduction rate can reach 95.87%, which is significantly superior to that of existing processes such as a microbiological method.

The objective is to provide an aqueous solution of gold(I) compounds that can be used as a gold source for gold plating solutions without causing precipitation over a wide pH range and with long-term oxidation stability. [Solution] An aqueous solution of a gold(I) compound having a structure represented by the following general formula (1), wherein the cyanide concentration is 500 mg / L or less, the sulfite ion concentration is 1000 ppm by mass or less, and the halogen ion concentration is 1000 mg / L or less. RS - -Au-S-(CH2) n -SO3 - ...(1) (In formula (1), R is an organic group having at least one group selected from the group consisting of a sulfonic acid group, a carboxyl group, and an amino group at its terminal or side chain, and n is an integer from 3 to 10.)

The invention discloses a device and a method for efficiently and continuously preparing ethylene sulfite and byproduct hydrogen chloride gas in an energy-saving manner. The device comprises at least two reaction raw material adding tanks, a reactive distillation low-pressure tower T2, a compressor C1 and a reactive distillation high-pressure tower T3, wherein the inlet of the reactive distillation low-pressure tower T2 is connected with reaction raw material adding tanks, and the at least two reaction raw material adding tanks at least respectively provide anhydrous ethylene glycol and thionyl chloride; an outlet in the top of the reactive distillation low-pressure tower T2 is sequentially connected with a compressor C1 and a reactive distillation high-pressure tower T3; collecting ethylene sulfite at an outlet in the bottom of the reactive distillation low-pressure tower T2; and hydrogen chloride gas is collected at the top of the reactive distillation high-pressure tower T3. The device further reduces the energy consumption, saves the investment cost, has the characteristics of simple process flow, less equipment, low cost, simplicity in operation, high yield, low energy consumption, green process and the like, and the product purity is high and can reach 99.99% or above.

The invention provides a method and system for measuring sulfite in desulfurization slurry based on multi-parameter integrated measurement, and the method comprises the steps: carrying out the analysis and research of the anti-corrosion and anti-interference performance and measurement precision of electrodes in an extreme environment of desulfurization slurry, and carrying out the type selection of various electrodes; a plurality of online measurable time sequence parameters are measured, corresponding sulfite concentration test values are synchronously obtained, and a multi-parameter associated data set is generated; based on the multi-parameter association data set, modeling and hyper-parameter tuning are carried out on a nonlinear sequential relationship among multiple variables, and a sulfite concentration prediction model is constructed; and optimizing the anti-interference performance of the prediction model through cross-unit transfer learning, dynamic disturbance test and sensitivity analysis, and outputting the sulfite concentration in the desulfurization slurry to be measured through the optimized prediction model. According to the method, sulfite and original monitoring parameters are subjected to multi-parameter integrated measurement, and the concentration of calcium sulfite in the slurry can be stably and accurately measured in real time.

This application discloses a visual tank-top buffer that facilitates the aging of wine. A buffer with a liquid level scale is installed in the manhole. During fermentation, any overflowing wine due to temperature changes can flow into the buffer, providing a buffer for the overflowing wine. Simultaneously, a sulfur sealer is installed on top of the buffer. A small amount of 6% food-grade sulfurous acid solution can be placed in the sulfur sealer's tank. Because the high concentration of sulfurous acid solution evaporates into a gaseous state, it can be replenished into the upper layer of the wine in the buffer under the action of wind, dispersing or combining with oxygen, thus protecting the wine from contact with oxygen. At the same time, gaseous sulfur dioxide does not easily enter the wine, forming an inert space, thus fully ensuring that the wine does not combine with oxygen, while also coping with the influence of temperature on the wine level.

The application discloses a method for recovering high-quality lead from waste lead storage battery lead paste by wet electrolysis, and belongs to the technical field of lead paste recovery. The method is used for solving the technical problems that the existing technology has a complex process, high energy consumption and the purity of recovered lead needs to be further improved in the process of recovering lead from lead paste. The method comprises the following steps: lead paste and sulfuric acid are added into a beaker, and then are immersed at room temperature for 18-20 hours; then the beaker is transferred to an iron stand with mechanical stirring; sulfurous acid is added into the beaker, and then is reacted at room temperature for 4-6 hours; and pretreated lead paste is obtained through post-treatment; and the pretreated lead paste and an ammonium acetate aqueous solution are added into a nitrogen-protected three-neck flask and are stirred. The method not only effectively simplifies the process flow of extracting lead from lead paste, reduces industrial energy consumption, but also reduces the impurity content in recovered lead while improving the lead recovery rate, and improves the quality of recovered lead.

The invention relates to a sulfite compound and a preparation method and application thereof, a composition and a method for preventing and controlling pest mites, the compound has a structure as shown in a formula (I), and based on the total amount of substance of isomers of (1S, 2S) configuration and (1R, 2R) configuration in the compound with the structure as shown in the formula (I), the content of stereoisomers of the (1S, 2S) configuration is more than 60 mol%. Compared with ethynylite, the sulfite compound shown in the formula (I) can achieve a better acaricidal effect at a lower use concentration.

The invention discloses a method for deeply processing corn, and belongs to the technical field of corn deep processing. According to the method, the corn soaking speed can be increased by adopting a pressurized soaking process, the production efficiency is improved, efficient separation of protein and starch is realized by replacing a traditional sulfurous acid method with a multi-time grinding-screening method, and meanwhile, water generated in the production process is completely recycled, so that the production cost is reduced. The purpose of producing corn deep-processing products without wastewater discharge and chemicals is achieved; the method for deeply processing corn has the characteristics of high product yield, environment-friendly production process, no chemical residue in the product, high production efficiency, low operation cost and good production environment, and in addition, the salt-free condensate water generated after the soluble extracting solution is evaporated and concentrated is reused in the step of washing starch, so that the production cost is greatly reduced. The corn starch with lower ash content can be obtained; therefore, the method for deeply processing the corn has a relatively good application prospect.