209 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 invention provides a rare earth assisted Fe-MnNi supported desulfurization catalyst, and a preparation method and application thereof, and relates to the technical field of environment-friendly materials and catalysis. The method comprises the steps of foam iron pretreatment, metal salt solution preparation, precipitation loading, additive adding, aging drying, roasting and the like. When the catalyst is used for treating the sulfur-containing wastewater, the catalyst is added into the sulfur-containing wastewater, and oxygen-containing gas is introduced through an aeration device. The catalyst provided by the invention has high activity, high stability and strong anti-poisoning ability, can efficiently remove sulfur ions, sulfite radicals and the like, remarkably improves the desulfurization rate, breaks through the limitation of a traditional treatment method, and is widely applicable to sulfur-containing wastewater treatment in the industries of chemical engineering, electroplating, leather and the like.

A process for stabilizing nutrients in anaerobic digestate involves removing hydrogen sulfide and ammonia from biogas. This process involves circulating the digestate in a column and contacting it with the biogas. Additional ammonium bisulfite, ammonia, and / or sulfur dioxide may be added to the contacting device to remove hydrogen sulfide from the biogas. The reactions will create ammonium bisulfite, ammonium sulfite, and ammonium thiosulfate to prevent ammonia and hydrogen sulfide emissions to allow for land application.

The present invention discloses a large-particle multi-level pore TS-1 molecular sieve for catalytic oxidation reaction in the field of molecular sieve catalytic materials, and its preparation method and use. When preparing the TS-1 molecular sieve, a silicon source, a titanium source, a template, a seed crystal and water are used to form a mixed dispersion, and a one-step hydrothermal crystallization is adopted. After filtering, washing, drying and roasting, a large-particle multi-level pore TS-1 molecular sieve is obtained. The molecular sieve has a cross-shaped long strip, a particle size of 6 to 10 μm, and a specific surface area of ​​≥370 m 2 / g, pore volume ≥0.4ml / g, average pore size 2-3nm. The present invention provides a large-particle multi-level pore TS-1 molecular sieve with excellent catalytic activity and stability, which can be used in the reaction of oxidizing vinyl sulfite to vinyl sulfate using dichloromethane as solvent and hydrogen peroxide as oxidant, has a long service life, is easy to recycle, has good product selectivity and high conversion rate.

The invention discloses a method for high-selectivity synthesis of ethylene sulfate from ethylene sulfite. An organosilane functional group is introduced to the surface of a TS-1 molecular sieve, the hydrophilic and hydrophobic degree of TS-1 is regulated and controlled, water is effectively prevented from being enriched around TS-1, and DTD hydrolysis side reaction is reduced, so that the stability and oxidation performance of the catalyst are improved, and the dispersity of TS-1 in a system is improved. The TS-1 treated by octadecyl trichlorosilane has moderate-strength hydrophobicity, so that the adsorption of substrates ES and H2O2 on the surface of the catalyst can be ensured, the aggregation of H2O molecules on the surface can be reduced, and the hydrolysis of DTD on the surface of the catalyst is inhibited. When the modified TS-1 molecular sieve catalyzes an ES oxidation reaction, DTD selectivity can reach 95% or above, and the modified TS-1 molecular sieve has good stability and reusability. The method is simple to operate, low in cost and suitable for large-scale industrial production.

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 invention relates to a preparation method and application of an ethylene sulfite compound, and the preparation method comprises the step of reacting an epoxy compound with sulfur dioxide under the action of an immobilized organic base catalyst to obtain the ethylene sulfite compound. The immobilized organic base catalyst is formed by connecting organic base and chloromethylated resin through chemical bonds, and has good catalytic activity and chemical stability. According to the preparation method provided by the invention, the raw material cost is low, the product is easy to purify, the yield is relatively high, continuous automatic production is easy to realize, and the prepared ethylene sulfite compound is added into the lithium battery electrolyte as an additive, so that the electrochemical window of an electrolyte system can be widened, and the high-voltage interface stability and the cycle performance of the battery can be improved.

The present application relates to a kind of catalyst for preparing ethylene sulfite, the preparation method of ethylene sulfite, the catalyst includes organic aluminum compound and amine, the molar ratio of the organic aluminum compound and the amine is 1-5:1.The preparation method of ethylene sulfite includes the reaction of contacting ethylene oxide with sulfur dioxide in the presence of the catalyst.The quaternary ammonium salt in the catalyst of the present application and trialkylaluminum are excited by phase transfer and coordination, etc.Effect, monomer ring-opening of ethylene oxide, promote SO2 and ethylene oxide to react to generate ethylene sulfite, and then high-purity ethylene sulfite is prepared with high yield.

The invention relates to the technical field of sulfurous acid preparation, in particular to a sulfurous acid preparation system formed by a workshop process water vacuum absorption unit, which is characterized in that firstly, a water ejector matched with the vacuum absorption unit is changed into vertical installation so as to improve the working efficiency; and the efficiency loss caused by high protein viscosity in the process water is effectively made up. Secondly, a gas-liquid separation part of a circulating storage tank matched with the vacuum absorption unit is added, so that bubbles in liquid are separated out, and the working requirements of a water ejector matched with the vacuum absorption unit and a circulating water pump matched with the vacuum absorption unit are met; comprising a sulfur combustion furnace, a sulfur storage box, a primary absorption tower, a secondary absorption tower, a vacuum absorption unit matched conveying water pump, a vacuum absorption unit matched circulating storage tank, a vacuum absorption unit matched circulating water pump and a vacuum absorption unit matched water ejector.

The present application specifically relates to the technical field of solid waste treatment. Disclosed is a method for preparing baking soda by using desulfurized fly ash. The method comprises: dissolution, coagulation-defluorination coupled precipitation defluorination, oxidative acidification, cooling crystallization, preparation of baking soda from sodium sulfate, reverse precipitation and preparation of baking soda from sodium chloride. In the present application, the industrial desulfurized fly ash is prepared into baking soda having a high added value by using an effective process, and the baking soda is reused in a desulfurization process, thereby achieving resource recycling of the industrial desulfurized fly ash. In addition, impurity ion COD, sulfite, carbonate, bicarbonate and fluorine ions, etc., in the desulfurized fly ash are comprehensively removed; and compared with a traditional process, the recycled baking soda has a higher purity and a higher recovery rate by means of process innovation.

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 relates to the technical field of agricultural chemistry, in particular to a method for inhibiting water evaporation and application of an anti-evaporation agent. By applying the sulfite compound, the water evaporation rate is remarkably reduced, and the application modes such as foliage spraying and drip irrigation can be adapted. The method has the advantages of being easy and convenient to operate, environmentally friendly and controllable in cost, and is suitable for agricultural water saving and precise pesticide application in arid regions.

The application discloses a cyanide-free electroplating solution capable of electroplating soft gold and hard gold, which comprises a gold sulfite, a complexing agent, a stabilizer, a hardness regulator, a conductive salt and a pH buffer. The cyanide-free electroplating solution provided by the application can be used to electroplate hard gold or soft gold plating layer by adjusting the content of the hardness regulator in the solution, and the cyanide-free electroplating solution is neutral and slightly acidic, does not contain toxic elements such as Tl, Pb and As, is environmentally friendly, and is suitable for wide application. In addition, the cyanide-free electroplating solution has a current efficiency greater than 98%, less side reactions in the electroplating process, and a dense gold plating layer.

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.

A method can include performing a series of reactions in a closed cycle, the series of reactions consisting of a hydrolysis reaction where a redox reagent is oxidized to a corresponding oxidized redox reagent with water contemporaneously with the production of hydrogen; and a reduction reaction where the oxidized redox reagent is reduced to the redox reagent using a sulfurous reactant contemporaneously with production of sulfur dioxide.

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.

The invention relates to the technical field of synthesis of ethylene sulfate, provides a method for directly oxidizing ethylene sulfite by using oxygen, and overcomes the defects that an ethylene sulfate synthesis method in the prior art is not environment-friendly, and a used catalyst is difficult to recover and high in price. According to the method, O2 is reduced into peroxide radicals (OOH-) through a catalyst firstly, the peroxide radicals (OOH-) are adsorbed to the surface of a carrier to form an active intermediate (Ti-OOH), and then S = O in ethylene sulfite is oxidized into O = S = O through the Ti-OOH. The method specifically comprises the following steps: 1) preparation of a catalyst and 2) synthesis of ethylene sulfate.

One embodiment of the present invention is a method for producing an aqueous manganese sulfate solution using a sulfur dioxide reduction leaching method, comprising: a raw material preparation step of preparing a manganese-containing by-product containing manganese and impurities; a pulverization step and a washing step of pulverizing and washing the manganese-containing by-product; a reduction leaching step of leaching the manganese-containing by-product pulverized by the pulverization step and the washing step; a neutralization step of neutralizing the post-leaching solution generated by the reduction leaching step; a first purification step of purifying the post-neutralization solution generated by the neutralization step; and a second purification step of additionally purifying the solution after the first purification generated by the first purification step, wherein the reduction leaching step is carried out using an inorganic acid and sulfur dioxide gas, and discloses a method for producing an aqueous manganese sulfate solution using a sulfur dioxide reduction leaching method.

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.

To overcome the problem of insufficient high-temperature cycle and high-temperature storage performance of existing batteries, the present invention provides a non-aqueous electrolyte, which includes a solvent, an electrolyte salt, and a first additive. The first additive is selected from at least one of the compounds represented by Structural Formula 1: A-D-B-E-C Structural Formula 1 wherein A, B, and C are each independently selected from groups containing a cyclic carbonate group, a cyclic sulfate group, a cyclic sulfite group, a cyclic sulfonate group, a cyclic sulfone group, a cyclic sulfoxide group, a cyclic carboxylate group, or a cyclic anhydride group; D and E are each independently selected from a single bond, or a group containing an alkylene group, an ether bond, a sulfur-oxygen double bond, or a carbon-oxygen double bond; the methanol content in the non-aqueous electrolyte is 200 ppm or less. At the same time, the present invention also discloses a battery including the above non-aqueous electrolyte. The non-aqueous electrolyte provided by the present invention can effectively improve the high-temperature performance of the battery while ensuring the stability of its performance.

The present invention relates to the technical field of electroless gold plating, and provides an electroless thick gold plating solution and a method for electroless thick gold plating on LTCC copper-based materials. The components of the electroless thick gold plating solution provided by the present invention include gold sulfite, alkali metal sulfite, sodium thiosulfate, benzotriazole, potassium polyvinyl sulfate, a pH adjuster, and water. The electroless thick gold plating solution provided by the present invention has the ability of autocatalytic reduction, does not need to form a gold layer by nickel displacement, and the pH value of the plating solution is alkaline, so it will not corrode the material during plating, greatly improving the wire bonding ability and welding performance of the coating. The electroless thick gold plating method provided by the present invention comprises the following steps: degreasing the LTCC copper-based material, and then successively performing glass etching, deoxidation, palladium activation, electroless nickel plating, pre-gold plating, and electroless thick gold plating. The present invention performs pre-gold plating before electroless thick gold plating, which can increase the adhesion between the gold layer and the nickel layer and improve the continuity and integrity of the deposition of the thick gold layer.