18 results about "Sulphite salt" patented technology

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 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.

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 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.

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 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.

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.

A shelf-stable aqueous reducing agent solution comprises a) a sulfinate of formula (Ia), b) a sulfonate of formula (Ib), and c) optionally, a sulfite of formula (Ic) M2SO3, wherein M is an equivalent of an alkali metal; wherein the total concentration of a), b) and c) is more than 10% by weight. The shelf stability of the reducing agent solution is significantly improved. The shelf-stable aqueous reducing agent solution is useful as a shippable form of a sulfinate of formula (Ia), in a method to inhibit decomposition of a sulfinate of formula (Ia) solution during storage and / or shipment, and in a method of performing a reducing step.

The application relates to the field of vanadium batteries and discloses a method for preparing an electrolyte of a vanadium battery by a short process of an alkaline vanadium solution, which comprises the following steps: adding an adsorbent to the alkaline vanadium solution to remove impurities, so as to obtain vanadium solution after impurities are removed; wherein the adsorbent comprises mercapto chitosan microspheres; mixing and reacting the vanadium solution after impurities are removed and a conversion agent, so that V(OH)4 + in the vanadium solution after impurities are removed is converted into VO 2+ , and vanadium solution after conversion is obtained; wherein the conversion agent comprises ascorbic acid and sulfite; the vanadium solution after conversion is adjusted to be acidic and a stabilizer is added, so as to obtain an electrolyte to be electrolyzed, and the electrolyte to be electrolyzed is electrolyzed, so that an electrolyte containing V 3+ and VO 2+ is obtained. The application can effectively shorten the preparation process of the electrolyte, avoid the interference of impurities and improve the current efficiency.

A shelf-stable aqueous reducing agent solution comprises a) a sulfinate of formula (Ia), b) a sulfonate of formula (Ib), and c) optionally, a sulfite of formula (Ic) M2SO3, wherein M is an equivalent of an alkali metal; wherein the total concentration of a), b) and c) is more than 10% by weight. The shelf stability of the reducing agent solution is significantly improved. The shelf-stable aqueous reducing agent solution is useful as a shippable form of a sulfinate of formula (Ia), in a method to inhibit decomposition of a sulfinate of formula (Ia) solution during storage and / or shipment, and in a method of performing a reducing step.

A process for producing protective-colloid-stabilized polymers based on ethylenically unsaturated monomers in the form of water-redispersible powders,by producing aqueous dispersions of protective-colloid-stabilized polymers based on ethylenically unsaturated monomers by polymerization of one or more ethylenically unsaturated monomers in an aqueous medium and drying said dispersions in the presence of one or more drying aids. The drying aids include a) one or more inorganic salts selected from the group of alkali metal sulfates and alkali metal sulfites and b) optionally one or more water-soluble organic polymers. The inorganic salts a) are present in the aqueous dispersions of the protective-colloid-stabilized polymers based on ethylenically unsaturated monomers in dissolved form after all drying aids have been added. The inorganic salts a) are employed as drying aids to an extent of ≥25% by weight based on the total weight of the drying aids.