392 results about "Alkali hydroxide" patented technology

The present application relates to the field of electrochemical negative electrode materials. Disclosed are a hard carbon material and a preparation method therefor, a negative electrode sheet and a sodium-ion battery. The preparation method comprises: pretreatment: taking a bamboo raw material, and heating and distilling same, so as to obtain a pretreated bamboo material from which bamboo vinegar has been removed; reaction: providing a mixed solution comprising an alkali metal hydroxide and a sulfur-containing substance, treating the pretreated bamboo material with the mixed solution, and reacting the pretreated bamboo material with the alkali metal hydroxide and the sulfur-containing substance; and carbonization: subjecting the reacted pretreated bamboo material to acid pickling, and then subjecting same to carbonization, so as to obtain a hard carbon material.

The present invention provides a polyphenylene sulfide resin and a method for preparing the same, the polyphenylene sulfide resin being obtained by measurement based on gel permeation chromatography using polystyrene as a conversion reference, in a differential molecular weight distribution curve using the logarithm value ln (M) of the molecular weight M as the horizontal axis and dw / dln (M) obtained by differentiating the concentration percentage w by the logarithm value ln (M) of the molecular weight as the vertical axis, the ratio of the value obtained by integrating dw / dln (M) at 6.90 < = ln (M) < = 9.21 with respect to the value obtained by integrating dw / dln (M) over the entire range of ln (M) is less than 5%. The preparation method of the polyphenylene sulfide resin is characterized in that a sulfur source, an alkali metal hydroxide and a dihalo aromatic compound are used as raw materials and subjected to a polymerization reaction in an organic polar solvent, and when the conversion rate of the dihalo aromatic compound is larger than 50%, materials passing through an external circulation pipeline are in a turbulent flow state so as to strengthen the mixing effect of a polymerization system; the polyphenylene sulfide resin can be prepared with high yield by inhibiting the generation of oligomer ultrafine powder waste. The method provided by the invention can significantly reduce the generation amount of oligomer ultra-micro powdery waste in the polyphenylene sulfide polymerization process.

The present invention provides a manganese metal-organic framework material with oxidase properties, a preparation method, and an application thereof. The material is prepared by the following method: using 1,3,5-trimethic acid as an organic ligand, manganese acetate tetrahydrate as a manganese source, and a water-ethanol solution as a solvent, to obtain a manganese metal organic framework (MOF) precursor via a solvothermal synthesis technique; the manganese MOF precursor is post-synthetically modified using an oxidant, wherein the oxidant is a mixed solution of an aqueous alkali metal hydroxide solution and H2O2, and the ratio of the manganese MOF precursor to the alkali metal hydroxide is (400-600) mg:(0.5-2) mmol. By using specific types and amounts of manganese MOF precursors and oxidants, the resulting metal-organic framework nanomaterial has specific enzyme-like properties, can exert the function of uricase, and has optimal and high uricase activity under neutral pH conditions.

The invention discloses a combined phenol-primary polyamidoamine phenol-amine resin nonionic demulsifier and a preparation method thereof.The preparation method comprises the steps that phenol M and primary polyamidoamine are mixed, a formaldehyde solution is dropwise added, a reaction product is diluted with methyl alcohol, and phenol M-primary polyamidoamine resin slurry is obtained; the preparation method comprises the following steps: mixing organic phenol N and formaldehyde, reacting under the catalysis of sodium hydroxide, and diluting a product with methanol to obtain phenol N phenolic resin slurry; dropwise adding the phenol N phenolic resin slurry into the phenol M-primary polyamidoamine resin slurry, reacting, refluxing to remove methanol and water to obtain combined phenol-primary polyamidoamine resin, and polymerizing the combined phenol (M-N)-primary polyamidoamine resin with epoxypropane and ethylene oxide in sequence under the catalysis of alkali metal hydroxide to generate R-PO-EO diblock demulsifier polyether. And cross-linking with a cross-linking agent to obtain the finished demulsifier. The demulsifier prepared by the invention has the characteristics of high dehydration speed and high final dehydration rate for thick oil emulsion in the Bohai Sea region, and especially can effectively reduce an emulsion layer of output crude oil for thick oil output liquid in a high-water-content exploitation period.

The invention discloses electronic-grade amine epoxy resin and a preparation method thereof, and belongs to the field of epoxy resin preparation. Aiming at the problems of more by-products and poor performance of the existing epoxy resin preparation, the invention provides the preparation method of the electronic-grade amine epoxy resin, which comprises the following steps: synthesizing a chlorohydrin ether intermediate from p-aminophenol and epichlorohydrin; meanwhile, a catalyst is added in the ring-opening reaction stage; carrying out removal of epoxy chloropropane; alkali metal hydroxide is added for a dehydrochlorination reaction, and a target product is generated in a closed-loop manner; and washing to remove excessive alkali metal hydroxides, and reacting to generate chlorides to obtain the electronic-grade amine epoxy resin. According to the method, the ring opening speed of phenolic hydroxyl is remarkably increased through the catalyst, so that epoxy chloropropane is fully reacted, and residues are reduced; according to the method, excessive epoxy chloropropane is removed, so that side reaction of epoxy chloropropane in a ring closing stage is avoided, generation of by-products is reduced to the greatest extent, operation is simple, and high-quality epoxy resin can be generated.

The invention relates to modified samarium-iron-nitrogen powder and a preparation method and application thereof, and belongs to the technical field of magnetic material preparation, the preparation method comprises the following steps: 1, mixing soluble samarium salt, iron oxide and ammonia water, and reacting to obtain a mixed solution; 2, mixing the mixed solution with an alkali metal hydroxide solution, and reacting to obtain a precursor; 3, the precursor reacts in the ammonia atmosphere, and samarium-iron-nitrogen powder is obtained; 4, a coating layer is arranged on the surface of the samarium-iron-nitrogen powder, and the modified samarium-iron-nitrogen powder is obtained. The preparation method is simple and convenient, and the prepared modified samarium-iron-nitrogen powder is high in purity, moderate in alpha-Fe content and excellent in intrinsic coercive force and can be used for manufacturing high-performance samarium-iron-nitrogen magnetic powder.

The invention discloses polyphenylene sulfide resin and a preparation method thereof. The weight-average molecular weight of the polyphenylene sulfide resin is 20000-50000, the molar ratio of a sulfydryl terminal group to a chlorine terminal group is 1-9, and the content of the chlorine terminal group is 15-60 [mu] mol / g. In the preparation method of the polyphenylene sulfide resin, a sulfur source, an alkali metal hydroxide and a dihalogen aromatic compound are taken as raw materials and subjected to a polymerization reaction in N-methyl pyrrolidone, and self-blocking is performed by accurately controlling the adding time of the dihalogen aromatic compound, so that controllable adjustment of an active end group is realized. The polyphenylene sulfide resin provided by the invention has excellent processability, and has excellent reactivity with silane coupling agents such as gamma-aminopropyltriethoxysilane and the like.

The invention belongs to the technical field of zirconium oxychloride preparation, and relates to a method and device for alkali fusion continuous production in the zirconium industry, and the method comprises the following steps: in a closed space, adding a certain amount of alkali metal hydroxide into an alkali fusion pan, preheating for 10-20 minutes at 350-450 DEG C, then heating for 10-40 minutes at 550-650 DEG C, and then cooling to room temperature to obtain the zirconium oxychloride. The method comprises the following steps of: adding zircon sand into an alkali fusion pot according to the ore-alkali mass ratio of 1: (1.2-1.5), adding the zircon sand for 10-20 minutes, keeping the temperature at 600-650 DEG C for 20-60 minutes, and finally cooling the alkali fusion pot to 50 DEG C within 120-240 minutes. The device comprises a tunnel kiln, and a preheating section, a heating section, a feeding section, a heat preservation section and a cooling section are arranged in the tunnel kiln. According to the invention, the labor intensity of workers can be reduced, the working environment can be improved, and the production efficiency and the zircon sand conversion rate can be improved.

The present disclosure relates to a method for processing of liquefied waste plastics (LWP). The method includes subjecting a liquefied waste plastic-based feedstock to heat treatment (HT processing) in an aqueous solution containing alkali metal hydroxide and / or alkaline earth metal hydroxide to form a heat treated effluent, transferring the heat treated effluent to a separator, subjecting the heat treated effluent to phase separation to isolate at least an oil phase including treated LWP and an aqueous phase including contaminated material, and recycling at least a part of the aqueous phase back to the HT processing.

The present invention performs: a step in which an anion-exchange resin before being packed into an ion-exchange device is brought into contact with an aqueous mineral-acid solution; and a step in which the anion-exchange resin that has been in contact with the aqueous mineral-acid solution is brought into contact with an alkali metal hydroxide solution having a metal concentration not higher than a given threshold.

To provide means for producing silver nanoparticles having a narrow particle size distribution and a fine particle size in a high yield.SOLUTION: A method for producing silver nanoparticles comprises: a raw material preparation step for preparing an aqueous solution of a silver salt and an aqueous solution of a reducing agent including an alkali metal hydroxide or an alkaline earth metal hydroxide; a temperature-raising step for mixing the aqueous solution of the silver salt and the aqueous solution of the reducing agent and raising the temperature of the mixture to a reaction temperature of 100°C or higher within 30 seconds from the start of mixing; and a reaction step for maintaining the mixture obtained in the temperature-raising step at the reaction temperature.SELECTED DRAWING: Figure 1

The invention discloses a separation and purification method of vanadium-containing tungstate. The method comprises the following steps: providing a vanadium-containing tungstate aqueous solution; providing an extraction liquid, wherein the extraction liquid comprises a sulfuric acid type quaternary ammonium salt extraction agent, a modifier and an organic solvent; mixing the vanadium-containing tungstate aqueous solution with the extraction liquid, and performing first extraction to obtain a first extraction phase and a first raffinate phase; providing strip liquor, wherein the strip liquor comprises alkali metal sulfate and alkali metal hydroxide; mixing the first extraction phase with the strip liquor, and carrying out first reverse extraction to obtain an alkali metal vanadate solution; and carrying out the same extraction and reverse extraction method on the first raffinate phase to obtain an alkali metal tungstate radical solution, thereby realizing respective separation and purification of vanadate radicals and tungstate radicals.

The invention relates to a wet catalytic oxidation catalyst and a preparation method thereof. The preparation method comprises the following steps: mixing a composite activator solution containing alkali metal hydroxide and a hydrated sodium silicate solution with a dry mixture containing water-quenched blast furnace slag and metallurgical copper slag to form precursor slurry, wherein the weight ratio of the dry mixture to the composite activator solution is 3: 2-2: 1; dispersing a solid copper-based active component in the precursor slurry to form catalyst slurry, wherein the weight ratio of the copper-based active component to the precursor slurry is 2: 100 to 25: 100; the catalyst slurry is subjected to curing forming, acid pickling and drying, and the wet catalytic oxidation catalyst is obtained. The catalyst prepared by the invention not only effectively improves the catalytic degradation efficiency of a wet catalytic oxidation system on organic matters, but also can be conveniently recycled and reused, and the cost of wastewater treatment is remarkably reduced.

The application discloses an improved electrolytic synthesis method of 3,6-dichloropicolinic acid, which comprises the following steps: adopting a diaphragm electrolytic cell, taking an aqueous solution containing 3,4,5,6-tetrachloropicolinic acid and a certain flow of CO2 gas as a cathode liquid, taking an aqueous solution of alkali metal hydroxide as an anode liquid, taking silver as a cathode, and taking a nickel-based material as an anode to carry out an electrolytic reaction, and obtaining 3,6-dichloropicolinic acid after the electrolytic reaction is completed. In the electrolytic process, the anode is separated from the cathode, so that corrosion is avoided; meanwhile, the CO2 gas is introduced to effectively control the occurrence of a hydroxylation side reaction, the molar yield of a hydroxyl byproduct is reduced from 20% to 35% to 2% to 8%, the molar yield of 3,6-dichloropicolinic acid is increased from 45% to 50% to above 80%, and the highest can reach 92.2%.

The invention provides spherical cobaltosic oxide as well as a preparation method and application thereof, the preparation method comprises the following steps: (1) injecting a cobalt salt-containing solution and a carbonate solution into a base solution in a parallel flow manner for a coprecipitation reaction to obtain a mixed-phase precursor; and (2) calcining the mixed phase precursor to obtain the spherical cobaltosic oxide, wherein the solute of the base solution in the step (1) is alkali metal hydroxide. According to the method disclosed by the invention, the precursor of the hydroxyl cobalt oxide and cobalt carbonate mixed phase can be prepared without separating kettles, the content of foreign ions in the precursor is low, and small-particle and high-purity cobaltosic oxide can be prepared by directly sintering.

The invention provides a manganese metal organic framework material with oxidase characteristics as well as a preparation method and application thereof, and the material is prepared by the following method: taking 1, 3, 5-trimesic acid as an organic ligand, manganese acetate tetrahydrate as a manganese source and a water-ethanol solution as a solvent, and obtaining a manganese MOFs precursor through a solvothermal method synthesis technology; the manganese MOFs precursor is subjected to post-synthesis modification with an oxidizing agent, the oxidizing agent is a mixed solution of an alkali metal hydroxide aqueous solution and H2O2, and the dosage ratio of the manganese MOFs precursor to the alkali metal hydroxide is (400-600) mg: (0.5-2) mmol. The manganese MOFs precursor and the oxidizing agent with specific types and using amounts are adopted, so that the obtained metal organic framework nano material has specific enzyme-like characteristics, can play a role of urate oxidase, has optimal urate oxidase activity under a neutral pH condition, and is relatively high in activity.

To transform anodic reaction from oxygen evolution reaction to iodate ion formation reaction in a method for manufacturing hydrogen by electrolyzing alkali water, and to highly efficiently implement an alkaline water electrolysis method with low power consumption.SOLUTION: There are provided a membrane-free alkaline water electrolysis method which electrolyzes an alkali metal hydroxide aqueous solution which contains iodide ions and whose concentration is higher than or equal to 1 mol / L, generates a hydrogen gas in a cathode, and generates iodate ions in an anode, and a membrane-free alkaline water electrolysis device.SELECTED DRAWING: Figure 9

The invention discloses a composite flame retardant, a flame-retardant ABS (Acrylonitrile Butadiene Styrene) composition as well as a preparation method and application thereof. The composite flame retardant is prepared from the following raw materials in parts by weight: 30-60 parts of an organic phosphorus chelating agent, 10-25 parts of soluble rare earth inorganic salt and 150-200 parts of zeolite. The preparation method of the composite flame retardant comprises the following steps: A) dispersing zeolite and alkali metal hydroxide in water to form a dispersion liquid I; b) dispersing soluble rare earth inorganic salt in the dispersion liquid I to form dispersion liquid II; and C) adding an organophosphorus chelating agent into the dispersion liquid II, and carrying out a heating reaction at 80-95 DEG C to prepare the composite flame retardant. The composite flame retardant provided by the invention can significantly improve the flame retardance, smoke suppression and mechanical properties of ABS resin.

The invention discloses a catalytic system for preparing amine compounds through nitro reduction and application of the catalytic system. The catalytic system comprises an alkaline aqueous solution, a reducing agent and a catalyst, the alkaline aqueous solution is an alkali metal hydroxide aqueous solution; the reducing agent is alkali metal hydroboron and / or alkaline earth metal hydroboron; the catalyst is copper salt lewis acid and / or other lewis acid; the other Lewis acid is selected from one or a combination of more of cobalt salt, ferric salt, zinc salt, manganese salt and palladium salt. When the catalytic system is used for reducing the aromatic nitro-compound, the using amount of a reducing agent is small, meanwhile, the using amount of an organic solvent is reduced, the reaction yield is high, the reaction is milder, and amplified production of the process is facilitated.

The invention relates to a preparation method of fluoro-ether, which comprises the following steps: providing a first reaction system which comprises paratoluensulfonyl chloride, fluorine-containing alcohol, an alkali metal hydroxide aqueous solution, a phase transfer catalyst and an organic solvent which is insoluble in water; performing a first reaction on the first reaction system to generate p-toluenesulfonate, then standing for layering, and taking an organic phase; providing a second reaction system, wherein the second reaction system comprises the organic phase, fluorine-containing alcohol and an alkali metal hydroxide aqueous solution; and carrying out a second reaction on the second reaction system to generate fluoroether. The preparation method is simple in operation steps, does not need or reduces the steps of extraction, separation and the like, and has the advantage of saving reagent cost.

The invention relates to a low-total-chlorine epoxy resin synthesis method, and belongs to the technical field of epoxy resin preparation. The invention provides a low-total-chlorine epoxy resin synthesis method. The low-total-chlorine epoxy resin synthesis method comprises the following steps: carrying out ring-opening reaction on a dihydric phenol compound and epoxy chloropropane in a mixed organic solvent under the action of alkali metal hydroxide; the mixed organic solvent is composed of a ketone solvent and an ether solvent, the ketone solvent is diisobutyl ketone, and the ether solvent is butyl ether and / or a branched ether compound; then carrying out mixed reaction on the system after the ring-opening reaction and an alkali metal hydroxide solution so as to carry out ring-closing reaction on a ring-opening reaction product; and finally, carrying out impurity removal and purification on the system after the ring-closure reaction to obtain the low-total-chlorine epoxy resin.

A flowback produced water stream is received from a hydraulically fractured well formed in a subterranean formation. The flowback produced water stream includes water, dissolved solids comprising divalent cations, and carbon dioxide. The flowback produced water is flowed to a membrane. The membrane separates at least a portion of the dissolved solids from a remaining portion of the flowback produced water to produce a waste stream and a filtered produced water stream. The filtered produced water stream is reacted with an alkali hydroxide to precipitate carbonates from the carbon dioxide molecules and the divalent cations, thereby mineralizing the carbon from the filtered produced water stream into carbonate precipitates. The carbonate precipitates are separated from a remainder of the filtered produced water stream.

The invention relates to the technical field of cellulose ether, and provides a method for reducing gel water insoluble substances in carboxymethyl cellulose. The method comprises the following steps: mixing alkali metal hydroxide, an organic solvent-water mixed solvent, a cellulose raw material and an additive, and carrying out alkalization reaction to obtain alkalization reaction liquid; the additive comprises a polyhydric alcohol; and mixing the alkalization reaction solution with an etherifying agent for etherification reaction to obtain the carboxymethyl cellulose. According to the method, the additive is added in the process of preparing the carboxymethyl cellulose by the slurry method, and a stable interface is formed among the cellulose, the alkali and the etherifying agent by utilizing the additive, so that the reaction uniformity is improved, and the content of gel water insoluble substances in the carboxymethyl cellulose is effectively reduced. The result of the embodiment shows that the content of gel particles in the product can be reduced from 49 to 23 by 53% when the carboxymethyl cellulose is prepared by adopting the method disclosed by the invention.

The present invention relates to a resource recovery method for sulfide all-solid-state batteries, which belongs to the field of solid-state battery technology. The main process is: retired sulfide all-solid-state battery cells undergo sulfur-heat reaction to obtain pyrolysis slag and current collectors, the pyrolysis slag undergoes water immersion treatment, and is separated to obtain water leaching liquid and water leaching slag, the water leaching liquid is concentrated and lithium precipitation is treated to separate lithium carbonate and alkali metal hydroxide solution, the water leaching slag undergoes acid leaching treatment to separate acid leaching slag and acid leaching liquid, the acid leaching liquid undergoes phosphorus precipitation treatment to separate hydroxyphosphate and phosphorus removal liquid, the phosphorus removal liquid undergoes nickel-cobalt-manganese precipitation treatment to separate nickel-cobalt-manganese coprecipitate and neutral alkali metal halide solution, the acid leaching slag undergoes dissolution treatment to separate graphite and sulfur, and the non-polar organic solvent is recycled. This method can effectively achieve high-value-added recovery of energy metals in retired sulfide all-solid-state batteries, synergistically achieve the recovery of graphite and sulfur, with low energy consumption and emissions and high raw material utilization.

The invention belongs to the field of chemical synthesis, and particularly relates to a preparation method of aromatic diether dicarboxylic acid, which comprises the following steps: (1) under the protection of inert gas, adding aromatic diphenol, p-fluorobenzonitrile, basic carbonate and a solvent 1 into a reactor, and reacting at 120-150 DEG C for 10-20 hours to obtain aromatic diether dinitrile; and (2) adding aromatic diether dinitrile, alkali metal hydroxide and a solvent 2 into the reactor, reacting at 100-150 DEG C for 10-20 hours, neutralizing with inorganic acid until the pH value is 1-2, filtering, washing with water until the pH value is neutral, and drying to obtain the product. By selecting specific reaction raw materials and process conditions, higher yield is successfully realized at lower temperature, and the method is very suitable for industrial production of aromatic diether dicarboxylic acid.

The invention discloses a method for depolymerizing polyester. The method comprises forming a polyester comprising the following components (a), (b) and (c): (a) a polyester, (b) one or more basic compounds selected from the group consisting of alkali metal hydroxides, alkali metal carbonates, alkali metal bicarbonate salts, alkaline earth metal hydroxides, alkaline earth metal carbonates and alkaline earth metal bicarbonate salts, and (c) and a step of depolymerizing the polyester in the mixture of a solvent containing at least one of an alcohol-based solvent and a ketone-based solvent. The temperature of the mixture at the time when the mixture containing the total amount of the polyester, the basic compound, and the solvent is formed is 75 DEG C or less. The ratio of the amount of the polyester to the amount of the solvent is 0.2-20 by mass.

In some embodiments the application pertains to processes comprising reacting a component comprising an alkaline earth weak acid with a component comprising an acid to form a component comprising an alkaline earth acid anion and a component comprising a weak acid derivative. At least a portion of the component comprising the alkaline earth acid anion is reacted with a component comprising an alkali sulfate to form a component comprising alkaline earth sulfate and a component comprising an alkali acid anion. At least a portion of the component comprising alkaline earth sulfate is decomposed to form a component comprising alkaline earth oxide, or alkaline earth hydroxide, or alkaline earth carbonate, or alkaline earth sulfide, or a derivative thereof, or any combination thereof, and a component comprising sulfur dioxide, or oxygen, or sulfur trioxide, or a derivative thereof, or any combination thereof.

The invention discloses an improved electrolytic synthesis method of 3, 6-dichloropicolinic acid, which comprises the following steps: adopting a diaphragm electrolytic cell, taking an aqueous solution containing 3, 4, 5, 6-tetrachloropicolinic acid and into which a certain flow of CO2 gas is introduced as a catholyte, taking an aqueous solution of alkali metal hydroxide as an anolyte, taking silver as a cathode and taking a nickel-based material as an anode to carry out an electrolytic reaction, and after the electrolytic reaction is completed, separating and purifying to obtain 3, 6-dichloropicolinic acid. And the 3, 6-dichloropicolinic acid is obtained. In the electrolysis process, the anode is separated from the cathode, so that corrosion is avoided; meanwhile, the introduced CO2 gas effectively controls the occurrence of hydroxylation side reaction, the molar yield of hydroxyl side products is reduced from 20%-35% to 2%-8%, and the molar yield of 3, 6-dichloropicolinic acid is increased from 45%-50% to 80% or above and can reach 92.2% to the maximum.

A process for the recovery of carbon dioxide (CO2) from a carbon dioxide-containing gas, in particular air and / or exhaust gas, comprises the steps: a) contacting the carbon dioxide-containing gas with an absorbent in the form of a solution of aqueous alkali metal hydroxide solution, in particular sodium hydroxide solution and / or potassium hydroxide solution, so that carbon dioxide is absorbed from the carbon dioxide-containing gas and alkali metal carbonate, in particular sodium carbonate (Na2CO3) and / or potassium carbonate (K2CO3), is formed in the absorbent; b) carrying out an ion exchange step, wherein the alkali carbonate formed in step a) is subjected in dissolved form to a cation exchange process so that the alkali ions of the alkali carbonate are bound to a cation exchanger; c) eluting the alkali ions bound to the cation exchanger in step b) with a solution containing ammonia and / or at least one amine, whereby alkali metal hydroxide solution is recovered, which is preferably used for the renewed absorption of carbon dioxide in step a)

To provide a 10-membered ring zeolite catalyst with which aromatic compounds such as benzene, toluene, xylene, and the like can be produced from a raw material alcohol having 1 to 4 carbon atoms with high selectivity.SOLUTION: A 10-membered ring zeolite catalyst is obtained by a hydrothermal reaction of a raw material mixture containing water, a silicon source, an aluminum source, a hydroxide and a branched alcohol, in which the hydroxide is one or more selected from a group consisting of an alkali metal hydroxide and an alkaline earth metal hydroxide, and the branched alcohol has 5 or more carbon atoms and further has a quaternary carbon. The 10-membered ring zeolite catalyst is used for production of an aromatic compound from a raw material alcohol having 1 to 4 carbon atoms.SELECTED DRAWING: None