278 results about "Alkali hydroxide" patented technology

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 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 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.

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 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.

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 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.

The invention provides a method for preparing trifluoromethyl sulfonate, which comprises the following steps: dissolving methylsulfonyl halide in an inert solvent, cooling, introducing fluorine-nitrogen mixed gas, stirring for reaction, and introducing nitrogen to purge residual fluorine gas; carrying out reduced pressure distillation on the reaction liquid, collecting a fraction at a certain temperature, namely trifluoromethylsulfonyl fluoride, drying by using a molecular sieve, and sealing and storing under the protection of nitrogen; the preparation method comprises the following steps: mixing and stirring alkali metal hydroxide and a proper amount of deionized water until the alkali metal hydroxide and the deionized water are completely dissolved, cooling in an ice-water bath, dropwise adding trifluoromethylsulfonyl fluoride, maintaining the temperature to be less than or equal to 30 DEG C, and stirring and reacting at room temperature after dropwise adding; and after the reaction is finished, filtering, collecting filtrate, carrying out reduced pressure distillation on the filtrate, and carrying out vacuum drying. The main content of the trifluoromethanesulfonate prepared by the method reaches 99.9% or above, the trifluoromethanesulfonate can completely meet the requirements of the trifluoromethanesulfonate in the fields of lithium battery electrolyte or sodium ion battery electrolyte, organic synthesis catalysts and the like, and the trifluoromethanesulfonate has a wide application prospect.

The invention belongs to the field of polymer adhesive materials, and particularly relates to a naringenin modified lignin phenolic resin adhesive and a preparation method thereof. The naringenin modified lignin phenolic resin adhesive is prepared from the following raw materials in parts by mass: 60 to 70 parts of formaldehyde solution, 65 to 85 parts of phenol, 6 to 14 parts of naringenin, 10 to 20 parts of lignin, 12 to 18 parts of alkali metal hydroxide and 25 to 30 parts of water. The mass concentration of the formaldehyde solution is 35%-40%. The phenolic resin adhesive is prepared by taking the biological phenol naringenin and the lignin as raw materials to replace part of phenol, so that the aim of environmental protection is fulfilled by replacing non-renewable resources with renewable resources, the bonding strength and the thermal performance of phenolic resin are improved, and the application field of the biological phenolic resin adhesive is widened.

The application discloses a Mo-Ni bimetallic denitration catalyst and a preparation method thereof, and relates to the technical field of denitration agents, and the preparation method comprises the following steps: firstly, a nickel source, a molybdenum source and an aluminum source are smelted and crushed to obtain a Ni-Mo-Al ternary alloy powder; then, the Ni-Mo-Al ternary alloy powder is added into a mixed alkaline leaching solution containing alkali metal hydroxide, a surfactant and hydrophobic conductive micro powder to perform a dealuminization reaction; hydrogen bubbles generated in-situ by the reaction are used as soft templates, and the hydrophobic conductive micro powder is adsorbed on the bubble interface and assembled in the skeleton through Pickering effect; finally, the catalyst is obtained through washing and drying; the catalyst prepared by the application has a large pore structure with conductive micro powder distributed on the inner wall; the unique structure not only reduces the mass transfer resistance, constructs an electron transmission channel, but also promotes the discharge of product nitrogen through a local hydrophobic environment, and significantly improves the catalytic activity and nitrogen selectivity when treating nitrate-containing wastewater.

The application relates to the field of photocatalytic materials, and discloses a preparation method and application of a Ge-doped ZnSn(OH)6 photocatalyst. The Ge-doped ZnSn(OH)6 photocatalyst is prepared by using SnCl4.5H2O, Zn(Ac)2.2H2O, alkali metal hydroxide, methyl cellulose and GeO2 as raw materials through a hydrothermal synthesis method. The crystalline powder can be obtained without high-temperature sintering, the catalyst can generate a large amount of electrons and hydroxyl radicals, has excellent degradation effect on volatile organic compounds such as methylbenzene, can realize 100% removal effect on 50ppm concentration methylbenzene within 10 minutes, has excellent deep mineralization capacity, and has great potential for pollution prevention and treatment of atmospheric environment.

The invention relates to the field of soil nitrogen fixation, in particular to nitrogen fixation biochar particles and a preparation method and application thereof. The preparation method of the nitrogen-fixing biochar particles provided by the invention comprises the following steps: pyrolyzing a biomass raw material to obtain pyrolytic carbon; mixing the pyrolytic carbon with a strong alkali solution, and reacting to obtain nitrogen-fixing biochar particles; the strong base in the strong base solution is alkali metal hydroxide. The number of oxygen-containing functional groups on the surfaces of the nitrogen-fixing biochar particles is increased by adopting strong base modification, and meanwhile, the specific surface area and the porosity of the nitrogen-fixing biochar particles are increased; the method reduces migration of dissolved nitrogen, facilitates fixation of nitrogen in the soil, effectively relieves nitrogen runoff and leaching loss caused by application of nitrogen fertilizer in the soil, improves the utilization rate of the nitrogen fertilizer, and relieves the pollution problem of lake water around a farmland.

The invention discloses a preparation method of hexa-naphthyloxy cyclotriphosphazene, which comprises the following steps: adding alkali metal hydroxide into a reaction solvent in which naphthol is dissolved, and reacting at 40-60 DEG C for 20-40 minutes to prevent oxygenolysis so as to prepare an alkali metal naphthol salt solution; the solution is stirred and dropwise added into a reaction solvent containing hexachlorocyclotriphosphazene, the ratio of hexachlorocyclotriphosphazene to the solvent is 1: 20-1: 30, the ratio of naphthol to hexachlorocyclotriphosphazene is larger than or equal to 6: 1, substitution is carried out step by step, after dropwise adding is completed, a reaction is carried out for 12-24 h at the temperature of 80-120 DEG C, and six chlorine atoms are completely substituted by naphthyloxy; filtering reaction liquid, and washing a filter cake with a solvent; and carrying out reduced pressure distillation on the filtrate to recover the solvent, washing the crude product with ethanol to remove an intermediate and an oligomer, washing with water to remove water-soluble impurities, filtering, and drying to finally obtain the high-purity hexa-naphthyloxy cyclotriphosphazene with the melting point of 169 DEG C. According to the method, the high-purity hexa-naphthyloxy cyclotriphosphazene crystal is ensured to be obtained by accurately controlling substitution reaction conditions and a multi-stage purification process.

A method for oxidation of substrates uses peracid salt compositions prepared from acyl donor, hydrogen peroxide and alkali metal hydroxide under controlled conditions to provide nonequilibrium compositions at high product yield from input feedstocks, and which are surprisingly stable prior to use. Substrates to be oxidized are contacted with a nonequilibrium treatment composition comprising such a nonequilibrium composition or a nonequilibrium adjusted composition prepared by adding one or more additives to the nonequilibrium composition prior to contacting the substrate, wherein the substrates are associated with food processing.

The invention discloses a zinc dicarboxylate catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalyst synthesis. The zinc dicarboxylate catalyst provided by the invention is prepared according to the following method: further reacting an intermediate obtained by reacting dicarboxylic acid with alkali metal hydroxide with zinc salt at constant temperature and low temperature, mixing the obtained mixture with ethanol, filtering, and washing a filter cake to obtain the high-activity zinc dicarboxylate catalyst. The zinc dicarboxylate catalyst with a more regular crystal form is obtained by accurately controlling the temperature and the pH value of a reaction mixture, the catalyst is a large-crystal-cluster rectangular flaky crystal, and the crystal cluster length of the catalyst is obviously larger than that of an existing zinc dicarboxylate catalyst. Meanwhile, the crystal thickness is obviously lower than that of the existing dicarboxylic acid catalyst. The zinc dicarboxylate catalyst disclosed by the invention shows very high catalytic activity in the process of catalyzing a CO2-epoxide copolymerization reaction.

To provide a method for producing a geopolymer cured body capable of satisfying both compressive strength and bending strength without making a curing environment high temperature and high humidity and without being influenced by an outside air temperature.SOLUTION: A method for producing the geopolymer cured body according to the present invention includes: a step (P1) of preparing a plurality of materials including fly ash, slag, water glass, alkali metal hydroxide and water to form a geopolymer paste; and a step (P3) of curing the geopolymer paste filled into a formwork for a predetermined period of time in a curing chamber in which the room temperature is adjusted to be 30°C or higher and 50°C or lower.SELECTED DRAWING: Figure 1

The present invention belongs to the field of phase change energy storage technology, and discloses a chitin-based phase change composite aerogel, its preparation method, and application. The preparation method is as follows: chitin powder is dispersed in an alkali metal hydroxide aqueous solution, refluxed, and then washed and dispersed with water to obtain a chitin dispersion; the pH of the chitin dispersion is adjusted to 2-4 and then mechanically ground to obtain a chitin nanofiber suspension; a portion of the chitin nanofiber suspension is mixed with solid paraffin and heated to melt the solid paraffin, followed by ultrasonic treatment to obtain a chitin-based paraffin emulsion; another portion of the chitin nanofiber suspension is mixed with the chitin-based paraffin emulsion to obtain a mixed solution; the mixed solution is pre-cooled and then freeze-dried to obtain a chitin phase change composite aerogel. The preparation method of the present invention can effectively retain the porous structure of the polymer aerogel, so that the prepared chitin-based phase change composite aerogel can simultaneously ensure the coexistence of thermal insulation and heat storage properties.

The invention discloses a preparation method of phloroglucinol triglycidyl ether, which comprises the following steps: (1) under the action of a catalyst and at the temperature of 100-130 DEG C, performing ring-opening reaction on phloroglucinol and epoxy chloropropane to generate tris (3-chloro-2-hydroxy propyl) phenyl ether; (2) adding water accounting for 1% of the total amount of reactants at 30-80 DEG C, adding alkali metal hydroxides in batches, and carrying out dehydrochlorination reaction; (3) dissolving the crude product obtained in the step (2) in a water-insoluble solvent, and washing with a low-concentration alkali metal hydroxide aqueous solution at 30-100 DEG C; and (4) washing with a low-concentration sodium dihydrogen phosphate solution, and carrying out reduced pressure distillation on a solvent layer to remove the solvent, thereby obtaining the phloroglucinol triglycidyl ether. By adopting the mode, the phenol type glycidyl ether with close to three functionality degrees can be synthesized.

The invention provides a method for separating calcium and sulfur in industrial byproduct gypsum. The method comprises the following steps: mixing and stirring industrial byproduct gypsum and a cosolvent solution to react, and filtering after reacting for a period of time to obtain a first filtrate and a first filter residue; adding alkali metal hydroxide into the first filtrate to form calcium hydroxide slurry, and introducing carbon dioxide to precipitate calcium ions in the first filtrate to obtain a product calcium carbonate and second filtrate; adding calcium chloride into the second filtrate, reacting sulfate ions in the second filtrate with the added calcium chloride at a certain temperature, and filtering to obtain calcium sulfate and a third filtrate mainly containing potassium chloride; alkali metal chlorine salt is used as a cosolvent, the solubility of calcium sulfate in a liquid phase is improved, and then separation of calcium sulfate and impurities in the byproduct gypsum is achieved through solid-liquid separation; compared with an organic solvent as a phase transfer solution, solid-liquid separation with alkali metal chlorine salt as a cosolvent is more convenient and quicker, and the cost is low.

This carbon dioxide gas treatment system comprises: a first reaction furnace (20) which accommodates an alkali metal hydroxide, has an exhaust gas inlet for supplying a carbon dioxide gas-containing exhaust gas containing a carbon dioxide gas, and generates an alkali metal carbonate by reacting the alkali metal hydroxide with the carbon dioxide gas in the carbon dioxide gas-containing exhaust gas; an alkali metal carbonate decomposition device (70) which decomposes the alkali metal carbonate generated in the first reaction furnace to generate the alkali metal hydroxide and the carbon dioxide gas; and a combustible gas generation device (100) which generates a combustible gas using the carbon dioxide gas generated in the alkali metal carbonate decomposition device. The alkali metal hydroxide generated in the alkali metal carbonate decomposition device (70) is circulated to the first reaction furnace (20).

The invention discloses a Mo-Ni bimetallic denitration catalyst and a preparation method thereof, and relates to the technical field of denitration agents, the preparation method comprises the following steps: firstly, smelting and crushing a nickel source, a molybdenum source and an aluminum source to obtain Ni-Mo-Al ternary alloy powder; then adding into a mixed alkaline leaching solution containing alkali metal hydroxide, a surfactant and hydrophobic conductive micro powder to carry out dealumination reaction; hydrogen bubbles generated in situ in a reaction are used as a soft template, and hydrophobic conductive micro powder is adsorbed on a bubble interface and assembled in a skeleton through a Pickering effect; and finally washing and drying to obtain the catalyst. The prepared catalyst has a macroporous structure with conductive micro powder distributed on the inner wall, the unique structure not only reduces mass transfer resistance and constructs an electron transport channel, but also promotes discharge of a product nitrogen through a local hydrophobic environment, and the catalytic activity and nitrogen selectivity during treatment of nitrate-containing wastewater are remarkably improved.

To provide a method for producing low-substituted hydroxypropyl cellulose having favorable disintegratability while maintaining sufficient compactibility.SOLUTION: A method for producing low-substituted hydroxypropyl cellulose having a hydroxypropoxy group content of 5 to 16 mass%, at least includes the steps of: bringing pulp into contact with and alkali metal hydroxide solution to obtain alkali cellulose; reacting the alkali cellulose with propylene oxide to obtain a reaction product; dispersing the reaction product into water containing at least acid to partially solubilize the reaction product, and then neutralizing the reaction product with an additional amount of acid to precipitate crude low-substituted hydroxypropyl cellulose; using a screw press to remove liquid from the crude low-substituted hydroxypropyl cellulose to obtain purified low-substituted hydroxypropyl cellulose having a water content of 50 to 60 mass%; and drying and pulverizing the purified low-substituted hydroxypropyl cellulose.SELECTED DRAWING: None

This invention relates to the field of selective hydrogenation technology, specifically to a selective hydrogenation catalyst for alkynes and dienes, its preparation method, and its application. The catalyst provided by this invention uses a modified composite oxide as a support, on which active components are loaded; wherein the modified composite oxide uses a composite oxide as a support, on which alkali metal hydroxides are loaded; the composite oxide includes alumina and zirconium oxide; the active components include nickel, iron, lead, and selenium. The catalyst provided by this invention not only possesses high reactivity and high selectivity, but also avoids excessive hydrogenation to form alkanes, while inhibiting or preventing olefin isomerization to form other isomers. Furthermore, it exhibits high stability, a long single-pass life, and does not require frequent regeneration.

To provide a liquid cleaning agent composition for hard surfaces that provides superior rapid-acting cleaning performance against denatured oily stains and also provides superior cleaning performance for film oily stains.SOLUTION: A liquid cleaning agent composition for hard surfaces contains (a) 1 mass% or more and 10 mass% or less of a nonionic surfactant having one chain hydrocarbon group with a carbon number of 5 or more and 22 or less, (b) 8 mass% or more and 15 mass% or less of one or more water-soluble organic solvents having an alkyl group with a carbon number of 1 or more and 4 or less, a hydroxyalkyl group with a carbon number of 1 or more and 4 or less, a phenyl group, a benzyl group, or an alkyleneoxy group with a carbon number of 2 or more and 4 or less, provided that those corresponding to the component (a) are excluded, (c) 1 mass% or more and 10 mass% or less of monoethanolamine, and (d) an alkali metal hydroxide and water, wherein a proportion of the component (a) in all surfactants contained in the composition is 60 mass% or more and 100 mass% or less, and a pH at 25°C is 12.0 or more.SELECTED DRAWING: None

The application discloses a preparation method of aluminum dialkyl hypophosphite with different alkyl groups, and comprises the following steps: (1) dispersing aluminum hypophosphite solid in a low concentration in a solvent system containing alkali metal hydroxide and water, the mass ratio of the aluminum hypophosphite solid to water being 1:20-1000; under the initiation of a free radical initiator, making olefin 1 and the aluminum hypophosphite solid to have an addition reaction at 100-150 DEG C and 0.1-0.3 MPa, and controlling the consumption of the olefin 1 to be sufficient for the reaction of the aluminum hypophosphite solid, so as to prepare an aluminum monoalkyl hypophosphite solution, filtering the precipitate, and collecting the filtrate; (2) continuously feeding olefin 2 different from the olefin 1 into the filtrate, and making the aluminum monoalkyl hypophosphite and the olefin 2 to have an addition reaction under the initiation of the free radical initiator at 100-150 DEG C and 0.1-0.3 MPa, so as to obtain aluminum dialkyl hypophosphite with different alkyl groups. The purity of the aluminum dialkyl hypophosphite with different alkyl groups prepared by the application is above 99.5%.