325 results about "Sulfurous acid" patented technology

The invention relates to the technical field of food quality management, in particular to a rapid detection method and kit for sulfur dioxide in preserved fruits based on a colloidal gold immunochromatography technology. According to the principle that malachite green MG can be rapidly detected by a malachite green colloidal gold immunochromatography detection card, sulfur dioxide or sulfite can be subjected to addition reaction with MG, and a product cannot be detected by the malachite green colloidal gold immunochromatography detection card, a reverse relationship between the content of sulfur dioxide in a sample and the residual amount of malachite green is obtained; mG is added into a preserved fruit sample extracting solution, after reaction, the malachite green colloidal gold immunochromatography detection card is used for detecting residual MG in a to-be-detected solution, so that sulfur dioxide in a preserved fruit sample is rapidly detected by using an immunochromatography colloidal gold detection method, and the kit disclosed by the invention is obtained based on the immunochromatography colloidal gold detection method. The method solves the technical problems that a colorimetric method is easily influenced by the clarification and transparency degree of sample liquid and background color, the sample treatment speed is low and the like.

The invention discloses a method for preparing a battery-grade vanadyl sulfate electrolyte by using a vanadium leachate, which comprises the following steps: S1, carrying out anion resin adsorption-desorption treatment and reduction treatment by using the vanadium leachate with the vanadium ion concentration of 1.0-20g / L as a stock solution and using a sulfurous acid solution or a saturated SO2 solution as a desorption solution to obtain a vanadyl sulfate solution with the vanadium ion concentration of 20-40g / L; the method comprises the following steps: sequentially performing extraction and back extraction on a vanadyl sulfate solution with the vanadium ion concentration of 20-40g / L to obtain a vanadyl sulfate electrolyte with the vanadium ion concentration of 80-160g / L; and S3, adsorbing the vanadyl sulfate electrolyte with the vanadium ion concentration of 80-160g / L by using an adsorbent, and filtering to obtain the battery-grade vanadyl sulfate electrolyte. According to the method, the removal of impurities in the vanadium leachate and the efficient reduction conversion and enrichment purification of vanadium ions can be simultaneously / synchronously realized, and the technical effects of improving the product quality, shortening the process flow, improving the production efficiency and reducing the production cost are achieved.

The invention relates to a preparation method of a sodium gold sulfite solution. The preparation method comprises the following steps: S1, preparing chloroauric acid; s2, slowly dropwise adding the prepared chloroauric acid into a sodium sulfite solution, when the solution becomes light yellow, temporarily stopping dropwise adding the chloroauric acid, adjusting the pH value, and after the solution becomes colorless and transparent, continuously dropwise adding the chloroauric acid until the chloroauric acid is completely dropwise added to obtain a crude sodium gold sulfite solution; s3, ethanol is added into the crude sodium gold sulfite solution, a crystal product is precipitated through an anti-solvent, after solid-liquid separation, the crystal product is washed multiple times with ethanol, and a sodium gold sulfite crystal is obtained; and S4, dissolving the obtained sodium gold sulfite crystals in a sodium sulfite solution to prepare a sodium gold sulfite solution, thereby obtaining the sodium gold sulfite solution.

The invention discloses a method for passivating soil arsenic by using a ferrous sulfide and sulfite conjugate, and belongs to the technical field of soil pollution remediation. The method is carried out in a heterogeneous system, a ubiquitous sulfur conversion intermediate product sulfite (SO32-) is taken as a research object, and a passivation mechanism of the sulfite to trivalent arsenic (As (III)) after the sulfite is coupled with ferrous sulfide is researched. The kinetic process of oxidizing and passivating As (III) under the coexistence of FeS and sulfite is analyzed, and after As (III) is oxidized into pentavalent arsenic (As (V)) in the process, the pentavalent arsenic (As (V)) is adsorbed and passivated on the surface of FeS, so that the removal of total arsenic in the soil is realized. As (V) mainly exists in a form of forming coprecipitation with Fe ions on the surface of FeS, the passivation long-term effect is relatively good, and the As (V) is not easily activated again. Therefore, a new thought is provided for research and development of farmland soil arsenic pollution control measures, and wide application prospects are shown.

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 invention discloses a method for preparing vinyl sulfate by continuously oxidizing vinyl sulfite. In a fixed bed reactor, vinyl sulfite is used as a raw material and hydrogen peroxide is used as an oxidant. Under the condition of continuous introduction of carrier gas at 5-100°C, a high conversion rate of 98% of the raw material and a product selectivity of 88% are achieved. The catalyst is not deactivated after 300 hours of reaction and has good stability. The invention removes the reaction product in time and reduces product hydrolysis by continuously introducing carrier gas into the fixed bed reactor, thereby improving product selectivity. The fixed bed reactor is adopted to solve the problems of complex operation of intermittent reactors, difficult catalyst separation, discontinuous reaction, etc. The method for continuously preparing vinyl sulfate provided by the invention is simple, efficient, and has low energy consumption. The cheap titanium silicon molecular sieve reduces the reaction cost and is easy to industrialize, providing a new route for the efficient and green conversion of vinyl sulfite to prepare vinyl sulfate.

The invention discloses a preparation method and application of lignin, and relates to the technical field of preparation of natural organic compounds. The preparation method comprises the following steps: mixing a plant raw material containing lignin with a solution containing sulfurous acid and / or sulfite, reacting at the temperature of 100-180 DEG C under the pressure of 0.4-0.8 MPa, and performing solid-liquid separation to obtain lignin filtrate. The lignin and cellulose obtained through the preparation method are easy to separate, the lignin content in the lignin filtrate is high, the lignin filtrate is applied to zinc smelting oxygen pressure leaching, commercially available lignin can be completely replaced, the proportion of flotation tailings cannot be increased, sulfur recovery is more facilitated, and the TOC content and the chloride ion content of the oxygen pressure leaching liquid can be reduced.

The present invention provides a gold plating method, a gold plating composition, and a plating solution that realize soft gold plating. The gold plating method is carried out using a plating solution that contains gold sulfite and at least one of thiosulfate ions and trithionate ions.

The invention provides a wet desulphurization oxidation air adjusting system and method with dual-mode verification feedback. A slurry storage tank is connected with a reactor through a sampling unit; the liquid storage bottle is filled with an iodine standard solution and a sodium thiosulfate standard solution, and is connected to the reactor through a hose and a precise injection pump; an oxidation-reduction electrode is inserted into the reactor; and the upper computer measures the oxidation-reduction potential of the solution in the reactor through the oxidation-reduction electrode so as to judge the titration end point and the consumption of the consumed titration standard solution, and inverts the concentration of sulfite ions in the desulfurization slurry. The upper computer is also connected with a dissolved oxygen analyzer to detect the concentration of dissolved oxygen in the slurry in the slurry storage tank; and mutual verification with the concentration of sulfite ions is carried out to realize dual-mode feedback regulation and control of the oxidation system. According to the invention, the complex nonlinear relationship and time dependence of each measurement parameter can be effectively captured, the accuracy of continuous and automatic measurement of sulfite ions in the desulfurization slurry is realized, and the precision is ensured.

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 invention discloses a graphene composite adsorbent and a preparation method thereof, and the graphene composite adsorbent comprises a graphene raw material, a waste catalyst, an acid aqueous solution, polyether sulfone, N, N-dimethylacetamide, polyallylamine hydrochloride and a modified glucose mixed solution. The waste catalyst comprises one or more of a waste Z-5 molecular sieve catalyst, a waste MTO catalyst, a waste molecular sieve adsorbent, fly ash, a waste FCC catalyst and a waste VOC adsorbent, the acid aqueous solution comprises a sulfurous acid solution and / or a phosphoric acid aqueous solution, the molar concentration of the acid aqueous solution is 1.5-2.5 mol / L, the graphene mixed powder is calcined, washed and dried to obtain pretreated powder, and the pretreated powder is dispersed in water; the preparation method comprises the following steps: adding polyether sulfone into N, N-dimethylacetamide, and fully dissolving to obtain a solution A; the graphene composite gel adsorbent obtained by the invention has very strong stability, can be repeatedly used, cannot reduce the adsorption effect due to repeated use, and can be used under various environmental conditions.

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 utility model provides a sodium hydrosulfide solution decolorizing device, and belongs to the technical field of sodium hydrosulfide solution processing. Comprising a reaction kettle, a stirring shaft is rotatably connected in the reaction kettle, and two round pipes fixedly penetrate through a kettle cover of the reaction kettle. Through the arrangement of the annular box, the inner dispersion boxes and the outer dispersion boxes, a potassium hydrogen sulfite solution flows into the annular box after passing through the round pipe, flows to the positions of the inner dispersion boxes and the outer dispersion boxes, is primarily dispersed by the inner dispersion boxes and the outer dispersion boxes, and is discharged from the bottoms of the inner dispersion boxes and the outer dispersion boxes; the discharged potassium bisulfite solution flows to a splitter plate of the shunting assembly and is shunted again by the splitter plate, and the splitter plate slowly rotates along with the stirring shaft in the shunting process, so that the dispersing area of the potassium bisulfite solution is increased, the potassium bisulfite solution is dispersed and then mixed with the sodium hydrosulfide solution, the stirring time for mixing the potassium bisulfite solution and the sodium hydrosulfide solution is shortened, and the stirring efficiency is improved. The reaction rate of the two is increased, so that the decolorization efficiency of the sodium hydrosulfide solution is improved.

The invention provides a hemicyanin probe compound, and establishes a method for detecting sulfite ions and sulfur ions in a solution by probe molecules under ultraviolet visible and fluorescent conditions. Common anions are respectively added into a C2H5OH-Hepes buffer solution, only sulfite and sulfide ions are changed, the sulfite ions can fade the solution, the fluorescence intensity of the solution is weakened and the anti-interference performance is good, and the sulfide ions can deepen the color of the solution, enhance the fluorescence intensity of the solution and have good anti-interference performance. Meanwhile, the residual quantity of sulfur dioxide in the stoving traditional Chinese medicinal materials is taken as a detection target, the stoving traditional Chinese medicinal materials are treated under an alkaline condition, and ultra-sensitive and rapid detection of the stoving traditional Chinese medicinal materials is realized through a standard curve method. The semi-cyanin probe compound has the advantages of high analysis speed, stable fluorescence performance, real-time detection and the like when being used for determining the content of sulfur dioxide residues in traditional Chinese medicinal materials, and has popularization and application values in sulfur dioxide residue detection in the fields of traditional Chinese medicines, foods and the like.

The invention discloses a method for oxidizing sulfite in desulfurized gypsum in the technical field of sulfite oxidation, which effectively solves the problem of oxidation of calcium sulfite in the desulfurized gypsum by adding carbonate and performing oxidation treatment, realizes recycling of resources and has remarkable environmental benefits and economic benefits.