36 results about "Sulphite salt" patented technology

The invention discloses a selective gold extraction process by a thiosulfate method, which comprises the following steps of: adding gold ore and anion exchange resin into an aqueous solution of a leaching agent, and stirring and leaching to obtain ore pulp containing gold-loaded resin; the leaching agent comprises thiosulfate, copper salt and ammonia water; separating the gold-loaded resin from the ore pulp, and desorbing the gold-loaded resin by adopting a desorption agent to obtain a gold-rich desorption solution; and adding dithionite into the gold-rich desorption solution for reduction to obtain an elemental gold product. According to the process disclosed by the invention, resin adsorption and recovery are synchronously realized during gold leaching, and coadsorption of copper is avoided, so that gold can be enriched by adopting the gold-loaded resin through one-section desorption, and the gold extraction process flow is greatly simplified. In addition, the process is high in gold leaching rate, short in leaching time, low in agent consumption and low in leaching cost. In addition, the resin can be directly and circularly used for gold leaching without regeneration, the reduction barren solution can be circularly used for desorption of the gold-loaded resin by supplementing a small amount of desorption agent, and the recovery cost is low.

The invention relates to the technical field of organic synthesis, in particular to a hydroxyethyl sulfonic acid alkali metal salt and a preparation method thereof. According to the preparation method provided by the invention, the high-purity hydroxyethyl sulfonic acid alkali metal salt solid can be directly obtained, and the content of the hydroxyethyl sulfonic acid alkali metal salt is not less than 99.6 wt%; the content of sulfate is not higher than 200ppm; the content of sulfite is not higher than 10ppm. The obtained high-purity isethionate alkali metal salt solid can be directly used for preparing surfactants such as coconut oil acyl isethionate alkali metal salt, lauroyl isethionate alkali metal salt and N-methyl taurine alkali metal salt, and the obtained surface active product is high in yield and good in quality.

The invention relates to the field of vanadium batteries, and discloses a method for preparing a vanadium battery electrolyte from an alkaline vanadium liquid in a short process, which comprises the following steps: adding an adsorbent into the alkaline vanadium liquid to remove impurities to obtain an impurity-removed vanadium liquid; wherein the adsorbent comprises sulfhydrylated chitosan microspheres; the impurity-removed vanadium liquid and a transforming agent are mixed and react, V (OH) 4 + in the impurity-removed vanadium liquid is transformed into VO < 2 + >, and transformed vanadium liquid is obtained; wherein the transforming agent comprises ascorbic acid and sulfite; and the converted vanadium liquid is adjusted to be acidic, a stabilizer is added to obtain a to-be-electrolyzed solution, the to-be-electrolyzed solution is electrolyzed, and an electrolyte containing V < 3 + > and VO < 2 + > is obtained. The preparation process of the electrolyte can be effectively shortened, impurity interference is avoided, and the current efficiency is improved.

The invention provides a method for preparing aza-2, 5-cyclohexadienone, and relates to the technical field of organic synthesis. Substituted phenol, an azo compound, inorganic salt and water are mixed, an intermolecular coupling reaction is carried out, aza-2, 5-cyclohexadienone is obtained, and the inorganic salt comprises one or more of carbonate, bicarbonate, phosphate, dihydric phosphate, dihydric phosphate, chlorine salt, sulfate, sulfite and silicate of alkali metal elements. According to the present invention, the cheap and easily available inorganic salt is adopted as the catalyst to catalyze the substituted phenol and azo compound molecule coupling reaction to prepare the aza-2, 5-cyclohexadienone, and the water is adopted as the reaction solvent, such that the preparation conditions are mild, the production cost is low, the produced by-products are less, the product yield is high, the atom economy is high, and the separation and the purification are simple. The method provided by the invention is simple and convenient to operate, has no pollution, meets the requirements of green chemical development and is suitable for industrial production.

Ligand-coated, doped lithium iron phosphate, wherein the general formula of the ligand-coated, doped lithium iron phosphate is LiFePO4@Mn-TC / N, where T is zinc and / or nickel and / or copper and / or iron and / or cobalt and / or zirconium and / or aluminum and / or gallium and / or chromium, and wherein the ligand-coated, doped lithium iron phosphate is produced by a manufacturing process comprising the following steps: Mixing a phosphate fertilizer, an iron source and a regulator, heating the resulting mixture for a reaction, performing a solid-liquid separation and removing a solid phase for initial calcination to obtain iron phosphate; Mixing the iron phosphate with a lithium source, a carbon source, and a carbon microsphere conductor, stirring the resulting mixture, and subjecting the mixture to a second calcination to obtain carbon microsphere conductor-doped lithium iron phosphate; and Mixing the lithium iron phosphate doped with the carbon microsphere conductor with a sulfite and a liquid-phase ligand, stirring a resulting mixture and subjecting the mixture to aging, crosslinking and third calcination to obtain the ligand-coated lithium iron phosphate, wherein the carbon microsphere conductor comprises carbon nanospheres, 1,6-bis(dimethylamino)hexane, a manganese source, a T source, methacrylamide and a dispersant, and wherein the T source comprises at least one of the following: soluble chloride salts, nitrates or sulfates of zinc, nickel, copper, iron, cobalt, zirconium, aluminium, gallium or chromium.

The application discloses a storage-stable methylglycine-N,N-diacetic acid trialkali salt composition and a preparation method and application thereof, which comprises methylglycine-N,N-diacetic acid trialkali salt, N,N-dimethylglycine metal salt, sulfite and water. The composition can be used for storing and / or stabilizing transportation of methylglycine-N,N-diacetic acid trialkali salt, improving the stability of the metal ion chelating ability of the composition product, especially the stability of the chelating ability of calcium ions and magnesium ions, and the composition product can be stably applied to the fields of daily washing, water softening and sewage treatment.

The invention discloses an iron / graphene oxide composite membrane for stable and complete dehalogenation, a preparation method of the iron / graphene oxide composite membrane and application of the iron / graphene oxide composite membrane in a self-circulation reduction system, and belongs to the field of catalytic membrane technologies and water treatment materials. According to the composite membrane, superfine zero-valent iron nanoparticles are uniformly loaded on a graphene oxide sheet layer through an in-situ growth method, and a ferrous iron-ferric iron-reduced graphene oxide cyclic catalytic system is constructed by utilizing a nano confinement effect in the membrane. The ferrous iron activates the sulfite to generate sulfite free radicals and ferric iron, and meanwhile, the ferric iron is reduced and regenerated into the ferrous iron by electrons provided by the reduced graphene oxide, so that a self-sustaining self-circulation catalytic system is formed. The system can realize efficient, rapid and stable degradation and complete dehalogenation of halogenated organic pollutants in a water body. The preparation process is simple, the material stability is high, the catalytic efficiency is remarkable, and the good practical application prospect is achieved.

The invention relates to a multi-ply containerboard for corrugated board, said multi-ply containerboard comprising a first outer ply, a second outer ply, and at least one intermediate ply sandwiched between the first and second outer ply, wherein the first and second outer ply comprise at least 70 wt-%, based on dry weight, of neutral sulphite semi-chemical (NSSC) pulp, and wherein the intermediate ply comprises at least 30 wt-%, based on dry weight, of unbleached kraft pulp and at least one cellulose-based strength enhancer, and wherein the intermediate ply comprises less than 30 wt-%, based on dry weight, of NSSC pulp.

The invention relates to a surface modified lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The surface modified lithium-rich manganese-based positive electrode material comprises a lithium-rich manganese-based positive electrode material core layer and a metal sulfate / metal sulfite modified layer which is constructed on the surface of the core layer in situ in an amorphous form, preferably, the metal sulfurous acid is located on the inner layer of the modification layer, and the metal sulfate is located on the outer layer of the modification layer.

The present invention relates to an additive concentrate useful for scavenging hydrogen sulphide and organic compounds, comprising monoethanolamine triazine and / or monomethylamine triazine and at least one salt chosen from alkali metal bisulfites, alkali metal metabisulfites and hydroxylamine sulfate. The invention also relates to a composition comprising said concentrate additive and a liquid vehicle, as well as the use of the additive concentrate or of the composition of the invention for scavenging hydrogen sulphide and / or organic compounds comprising at least one sulfhydryl group in a liquid or gaseous stream.

The invention belongs to the field of new materials, and discloses a preparation method of 1-propylene-1, 3-sultone, which comprises the following steps: step 1, addition reaction: using propargyl alcohol and alkali metal sulfite and / or alkali metal hydrosulfite as raw materials, and carrying out addition reaction in the presence of a catalyst and a free radical initiator to obtain an addition product; step 2, acidification reaction: adjusting the pH value of the addition product to 4 or below 4, and separating to obtain an acidified product; step 3, cyclization reaction: carrying out cyclization reaction on the acidified product to obtain 1-propylene-1, 3-sultone; the catalyst is soluble metal salt which is soluble in water. According to the method, the catalyst and the free radical initiator which are low in price are compounded, so that a product with relatively good conversion rate and selectivity is obtained.

The application discloses a two-photon fluorescent dye containing pyridine dicarboxylic acid units, and a preparation method thereof. The dye has the following preparation method: 6-hydroxy-2-naphthaldehyde reacts with a sulfonic acid lactone under the action of an alkaline substance, or reacts with a dihalogenated hydrocarbon to obtain a monohalogenated hydroxyl aryl ether, and then the monohalogenated hydroxyl aryl ether reacts with a sulfite to prepare S1; 4-(4-methylphenyl) pyridine-2,6-dicarboxylic acid diethyl ester reacts with N-bromosuccinimide to obtain a bromide, and then the bromide reacts with triphenylphosphine to prepare S2; intermediates S1 and S2 react under the action of a strong base, and then hydrolysis is carried out to prepare a target product. The dye has good cell membrane permeability, preferentially targets a cell nucleus, is well dispersed in the cell nucleus, has water solubility, has very low toxicity, has a high two-photon absorption interface, and can be applied to two-photon fluorescence confocal microscopic imaging.

A class of cathode materials and secondary ion batteries containing these materials are provided. These cathode materials at least include a cathode active substance comprising a first active substance and a carrier. The first active substance is selected from alkali metal halide or alkali metal sulfite, alkaline earth metal halide or alkaline earth metal sulfite, aluminum halide, zinc halide and zinc sulfite. The carrier has a low-dimensional structure and is selected from a template and / or a second active substance. The first active substance of the cathode material has a relatively low molecular weight and a relatively high redox potential, and thus the secondary ion batteries have a relatively high specific capacity and voltage.

The present invention relates to a method for scavenging hydrogen sulphide and / or organic compounds comprising at least one sulfhydryl group in a liquid or gaseous stream, comprising contacting said stream a composition comprising: - monoethanolamine triazine and / or monomethylamine triazine, and - at least one salt chosen from alkali metal bisulfites, alkali metal metabisulfites and hydroxylamine sulfate, wherein the weight ratio between the total amount of monoethanolamine triazine and / or monomethylamine triazine and the total amount of said salt(s) lies within the range from 1:1 to 100:1. The present invention also concerns an additive composition useful for scavenging hydrogen sulphide and organic compounds.

The application discloses a method for recovering multiple metals from waste lithium batteries, comprising the following steps: S1. mixing waste lithium battery black powder with a magnesium-containing chlorinating agent, and performing roasting treatment to obtain a roasting product; S2. mixing the roasting product with a weak alkaline leaching agent, and performing leaching treatment, and after filtration, a lithium-containing solution and a filter residue are obtained; S3. adding an ammonia-carbonate-sulfite composite leaching agent to the filter residue to perform ammonia leaching treatment, and after filtration, a nickel-cobalt-rich ammonia complex leaching solution and a manganese-rich solid residue are obtained; S4. sequentially performing heating and extraction treatment on the nickel-cobalt-rich ammonia complex leaching solution, and nickel sulfate and cobalt sulfate are obtained; performing dissolution and precipitation treatment on the manganese-rich solid residue, and a manganese salt is obtained; through the synergistic coupling of magnesium chloride roasting and composite ammonia leaching, lithium is preferentially extracted, and the pre-activation of transition metal phases is realized, so that the inherent contradiction that lithium efficient extraction and nickel-cobalt efficient leaching cannot be achieved simultaneously in the existing process is successfully resolved.

The present invention provides a method for synthesizing S-(p-tolyl) 4-methylbenzenesulfite, comprising the following steps: a) mixing p-methylthiophenol, benzaldehyde, an electrolyte and a solvent to obtain a mixed solution; b) performing an electrolytic reaction using the mixed solution as an electrolyte to obtain a reaction mixed solution; c) subjecting the reaction mixed solution to extraction, concentration and separation and purification to obtain S-(p-tolyl) 4-methylbenzenesulfite. The synthesis method provided by the present invention can avoid using transition metals and excessive oxidants that are toxic to the human body, is green and environmentally friendly, and can ensure the yield at the same time.

The invention belongs to the technical field of resource recycling, and particularly relates to a method for comprehensively recovering tellurium, copper, selenium and arsenic from copper tellurium slag. The method comprises the following steps: oxidizing and roasting the copper tellurium slag at 700-800 DEG C to obtain a copper tellurium composite oxide, carrying out a vacuum carbon thermal reduction reaction to respectively obtain elemental copper and elemental tellurium gas, mixing the mixed gas generated by oxidizing and roasting with a mixed solution containing sulfide and alkali metal hydroxide, and carrying out an oxidation reduction reaction to respectively obtain arsenic sulfide slag and a selenium-containing solution; and reducing the selenium-containing solution by using a sulfite reducing agent to obtain elemental selenium. According to the method, tellurium, copper, selenium and arsenic in the copper tellurium slag can be effectively recovered, the recovery rate is high, the purity of the recovered product is high, and the method is simple in technological process, low in cost, stable in product quality, easy to industrialize and environmentally friendly.

The invention relates to a lignin phenolic resin adhesive which is prepared by the following steps: pretreating biorefinery residues, mixing with water and alkali, separating, repeating, concentrating to obtain lignin concentrated alkali liquor, adding phenol, water and sulfite, pre-reacting, adding formaldehyde and alkali for reacting, finally adding urea, and discharging to obtain the adhesive. According to the method, mild treatment conditions are adopted in lignin extraction, ether bonds can be reserved as many as possible, the activity of lignin can be reserved in subsequent application, the strength of a phenolic resin adhesive is improved, and in the hot pressing process of preparing plywood through the adhesive, lignin can further release active groups and continue to react with residual formaldehyde; sulfite is added for pre-reaction, lignin is further degraded, and a degradation product can directly participate in the reaction in situ in the subsequent process; the synergistic treatment of the two modes is also beneficial to keeping the activity of a small amount of lignin, the lignin reacts with residual formaldehyde in the subsequent hot pressing process, and the formaldehyde emission of a finished product is reduced.

This invention belongs to the field of magnetic nanomaterials technology, specifically relating to a nano-zero-valent iron-iron tetroxide composite material, its preparation method, and its application in treating electroplating wastewater. This invention utilizes carbon materials as a carrier and employs a rheological phase method, using an environmentally compatible low-sulfite solution as a reducing agent, to create nanoparticles with a zero-valent iron substrate. This process completes the generation of the nano-zero-valent iron substrate, the modification of its surface with sulfur, and the loading of biochar, resulting in a layered nano-zero-valent iron-iron tetroxide composite material. This composite material exhibits strong adsorption capacity and selectivity for heavy metal ions. The preparation method offers advantages such as low cost, low investment, and high yield, achieving more efficient and lower-cost heavy metal removal and wastewater purification.

A device for preparing a sulfite includes: a mother liquid tank and alkaline bin connected to a concentrated alkaline tank, connected to a tower reactor first reactor, one first reactor bottom output end is connected to a first gas-and-liquid mixer and another to a bubbling reaction kettle upper end, a bubbling reaction kettle gas output end is connected to the first mixer being connected to a first reactor upper portion; first reactor upper portion gas and second reactor bottom output ends are connected to a second mixer being connected to the second reactor top; and the bubbling reaction kettle is connected to a centrifugal machine or the alkaline tank, the machine being connected to a wet material bin and the liquid tank. A method includes preparing main and auxiliary absorption liquids, generating a middle slurry, reabsorbing residual gas SO2, generating a target product, separating the target product, drying and packaging.

A nonaqueous electrolyte solution for an energy storage device, the solution comprises i) an aprotic organic solvent system; ii) an alkali metal salt; and iii) at least one brominated sulfite-based flame-retardant additive compound. The halogenated sulfite flame retardant increases the flame retardancy and / or thermal runaway inhibitory capacity of the nonaqueous electrolyte solution without appreciably impacting the electrochemical performance of the nonaqueous electrolyte solution. Methods and processes for making such nonaqueous electrolyte solutions and energy storage devices containing the same are provided. Electrical energy storage devices with these enhanced properties, including enhanced flame retardancy and thermal runaway inhibitory capacity, are also provided.

The present application relates to the technical fields of organic compound synthesis method, and particularly relates to a trifluoromethyl-containing sultone derivative and a preparation method and application thereof.The preparation method of the trifluoromethyl-containing sultone derivative of the present application comprises the following steps: (1) sulfonation reaction: addition reaction of propargyl alcohol and alkali metal sulfite or alkali metal bisulfite to obtain an intermediate 3-hydroxy propenyl sulfonate; (2) cyclization reaction: acidification treatment of the intermediate 3-hydroxy propenyl sulfonate to obtain 3-hydroxy propenyl sulfonic acid, and then ring closure reaction to obtain 1-propen-1, 3-sultone; (3) fluorination reaction: reaction of 1-propen-1, 3-sultone with a suitable fluorination reagent to obtain the trifluoromethyl-containing sultone derivative.The preparation method of the compound is simple and easy to operate, the raw materials are cheap and easy to obtain, the reaction conditions are mild, and the compound is a functional material with wide application prospect and can be applied as an electrolyte additive.

The application provides a water-based secondary ion battery. The water-based secondary ion battery comprises a positive electrode material; the positive electrode material at least comprises a positive electrode active material, the positive electrode active material comprises a first active material and a carrier, the first active material is selected from an alkali metal halide or an alkali metal sulfite, an alkaline earth metal halide or an alkaline earth metal sulfite, an aluminum halide or an aluminum sulfite, or a zinc halide or a zinc sulfite; the carrier has a low-dimensional structure; and the carrier is selected from a template and / or a second active material. The first active material of the positive electrode material has a lower molecular weight and a higher redox potential, so that the water-based secondary ion battery has a higher specific capacity and voltage. Meanwhile, the secondary ion battery adopts a water-based electrolyte, has high safety, and has a wide application prospect.

A nonaqueous electrolyte solution for an energy storage device, the solution comprises i) an aprotic organic solvent system; ii) an alkali metal salt; and iii) at least one brominated sulfite-based flame-retardant additive compound. The halogenated sulfite flame retardant increases the flame retardancy and / or thermal runaway inhibitory capacity of the nonaqueous electrolyte solution without appreciably impacting the electrochemical performance of the nonaqueous electrolyte solution. Methods and processes for making such nonaqueous electrolyte solutions and energy storage devices containing the same are provided. Electrical energy storage devices with these enhanced properties, including enhanced flame retardancy and thermal runaway inhibitory capacity, are also provided.

This invention discloses an electrolyte and a lithium battery to address the technical problems of existing lithium batteries where increasing the charging rate leads to increased charging temperature, increased system side reactions, increased risk of lithium plating at the negative electrode, and deterioration of cycle performance. The electrolyte of this invention includes a lithium salt, a solvent, and additives. The solvent includes a fluorocarboxylic acid ester, and the additive includes additive A. In the above design, by adding additive A to the electrolyte, the oxygen atom in the substance gains an electron during formation, breaking the five-membered ring and further reacting to obtain a sulfite product. This effectively reduces interfacial film-forming resistance, lowers temperature rise, and reduces the risk of lithium plating. Simultaneously, the fluorocarboxylic acid ester in the solvent balances kinetic and thermal stability, thus achieving a balance between the fast-charging performance, high-temperature cycling, and storage performance of the lithium battery. Furthermore, it also improves the safety performance of the lithium battery.

The invention relates to a two-part dual cure dental composition with improved stability toward discoloration and premature polymerization. The dental composition comprises a Base Part and a Catalyst Part, the Base Part comprising polymerizable component(s) without an acidic moiety, optionally polymerizable component(s) with an acidic moiety, filler(s), transition metal component(s), peroxide component(s), stabilizer component(s) comprising a free-radical moiety, the Catalyst Part comprising polymerizable component(s) without an acidic moiety, filler(s), ascorbic acid component, photo-initiator system, stabilizer component(s) comprising a phosphite or sulfite moiety. The dental composition is in particular useful as bulk fill dental composite, dental resin cement, core build-up dental material or self- and dual cure dental adhesive. The invention further relates to an initiator system and the use of a stabilizer comprising a free-radical moiety.

The invention relates to the technical field of organic synthesis, in particular to a hydroxyethyl sulfonic acid alkali metal salt solution and a preparation method thereof. According to the preparation method provided by the invention, 50-65wt% of an isethionic acid alkali metal salt solution can be directly obtained, and the content of sulfate is not higher than 0.2 wt%; the content of sulfite is not higher than 0.015 wt%; the ethylene glycol content is not higher than 0.25 wt%. The solution can be directly used for preparing surfactants such as N-methyl taurine alkali metal salt and coconut oil acyl isethionate alkali metal salt, and the obtained product is high in yield and good in quality.

The invention belongs to the field of silver recovery, and particularly relates to a method for recovering silver. The invention provides a method for recovering silver, which comprises the following steps of: dissolving a silver-containing battery piece in nitric acid, and filtering to obtain a silver nitrate-containing solution; (2) the solution containing silver nitrate and chlorate are mixed to form a mixed solution, the mixed solution is filtered, silver chloride sediment and filtrate are obtained, and the molar ratio of the chlorine element to the silver element in the mixed solution is not larger than 1; (3) washing the silver chloride precipitate, mixing the washed silver chloride precipitate with a first solution, carrying out ultrasonic treatment to dissolve the silver chloride precipitate in the first solution to form a mixed solution, and electrolyzing the mixed solution to obtain recovered silver; the first solution comprises thiosulfate and pyrosulfite. According to the silver recycling method, silver dissolving and electrolytic recycling are integrated, the process is portable and rapid, and the method is suitable for industrial popularization; and recycling can be performed at normal temperature, and the process requirement is low.

The present invention discloses a flotation separation method for a copper-molybdenum mixed concentrate and a combined depressant used therein. The combined depressant comprises dithionite and thiobarbituric acid. The method involves adding dithionite to the copper-molybdenum mixed concentrate slurry for drug removal, then adding thiobarbituric acid to depress chalcopyrite, and then adding a molybdenite collector and a frother for flotation, thereby obtaining molybdenum and copper concentrates. The combined depressant is non-toxic and environmentally friendly, and the synergistic effect of the two depressants achieves excellent chalcopyrite inhibition at relatively low dosages, significantly improving molybdenum recovery and molybdenum-copper separation efficiency.