51results about How to "Improve the efficiency of the reduction reaction" patented technology

The invention discloses a making method of concentrate iron ore, which comprises the following steps: (1) adding 5-25% ferric powder or ferric mud into disposed powder evenly; (2) placing material into reducing sintering furnace to sinter for 2-8 min through microwave; reducing weak magnetic ferric ore into magnetic ferric ore; (3) proceeding magnetic cobbing to obtain the product.

The invention provides a cobaltous selenide promoter Co0.85Se as well as a preparation method and application thereof and belongs to the field of photocatalysis. The promoter provided by the invention is a nano laminated material synthesized by using a solvothermal method. The material integrates advantages of electron transmission of transition metallic ions, large specific surface areas of two-dimensional materials, high activity exposure ratios, and the like, and performance of photocatalysis CO2 reduction reactions can be effectively improved. The cobaltous selenide promoter is simple and feasible in preparation method, gentle in reaction system condition and wide in application prospect in fields such as CO2 immobilization, conversion and the like with solar energy.

The invention provides an iron-making method by utilizing a flash iron-making furnace. The iron-making method comprises the following steps: spraying dry iron ore concentrate, a solvent and a fuel comprising coke, pulverized coal and oxygen in a cavity of a reduction tower of the flash iron-making furnace, and forming a high-temperature reducing atmosphere in the cavity of the reduction tower; carrying out an oxidation-reduction reaction inside the cavity of the reduction tower on the dry iron core concentrate and reducing gas to obtain molten iron, slag and smoke gas, and forming a coke layer, a slag layer and a molten iron layer from top to bottom inside a molten pool, wherein the oxidation-reduction reaction is carried out at 600-1200 DEG C, and 5-80% of carbon monoxide in volume is contained in the reducing atmosphere. The iron-making method by adopting the embodiment of the invention is simple in technology and low in cost, and the reduction reaction efficiency can be obviously improved.

The invention provides a recycling method of tail gas from pyrolusite reduction in a fluidized bed furnace, belonging to the technical field of ore product processing. In order to improve the conversion of manganese peroxide to manganese monoxide in the fluidized bed furnace, the reduction reaction is necessarily carried out under a low-oxygen condition, and the mixed gas formed by air and tail gas of the fluidized bed furnace is blown from the lower segment of the fluidized bed furnace so as to guarantee that the oxygen content in the mixed gas is very low. The technique is simple and easy in operation, has high manganese peroxide conversion rate, recycles the tail gas, and reduces the environmental pollution.

The invention provides a method for controlling residual sludge reduction in an activated sludge-sewage treatment system. The method sets three zones, namely an anaerobic zone, a circulating zone and a limited oxygen zone which are connected in turn from a sludge inlet to a sludge outlet in a sludge reduction reactor; the sludge enters the anaerobic zone from the sludge inlet at the upper part, is evenly mixed by stirring, and then downwards flows to the circulating zone; and the sludge circularly flows in the circulating zone under the action of an underwater mixer, then upwards enters the limited oxygen zone, and finally is discharged from the sludge outlet at the upper part of the limited oxygen zone. The invention further provides a reactor for realizing the method for anaerobic / limited oxygen hemicyclic sludge reduction with an arc guide plate. The residence time of the whole reactor is 6 hours, the dissolved oxygen concentration of the limited oxygen zone is 0.5 to 1.1 milligrams per liter, and the ratio of the practical anaerobic / limited oxygen residence time in the reactor is 1.10-1.25:1.0. The radius R1 of the circulating zone of the reactor is 0.5 L1, and the effective height H of the reactor is 4R1. The method has the advantages of good activated sludge reduction effect, low energy consumption, occupied place economy and the like, and can effectively separate inorganic granules in the activated sludge, ensure the effluent effect of the sewage treatment system, well improve the settling performance of the activated sludge, and the like.

The invention relates to a gas producer and a gas preparation method. The gas producer comprises a hearth, a reducing zone and a gas guide zone which are sequentially arranged in a producer wall from top to bottom, wherein a pulverized coal inlet is formed on the wall face of the hearth; a second gas inlet is formed on the wall face of the reducing zone, and a fine pulverized coal inlet is also formed on the wall face of the reducing zone or a wall face at the intersection of the reducing zone and the hearth. The method comprises the following steps of: introducing pulverized coal particles and a gasification agent into the gas producer for burning; and introducing fine pulverized coal particles into the gas producer to ensure that the materials in the gas producer are reacted to form carbon monoxide and hydrogen gas. In the invention, the technical means of forming the fine pulverized coal inlet on the gas producer for leading the fine pulverized coal particles in a carbon monoxide preparing reaction through reduction is adopted, so that the concentration of materials in the reducing zone is improved; the reduction reaction efficiency in the reducing zone can be promoted; and then the preparation efficiency of gas can be improved.

The invention relates to a preparation method of TiB2 ceramic powder. The preparation method comprises the steps: preparing materials according to the mass ratio of a reductant to a titanium source toa boron source to an alkali metal compound-containing molten salt of 1.0:(0.7-1.2):(0.7-4.0):(0.2-20.0), mixing evenly, carrying out heat treatment for 0.5-8 h under conditions of a protective atmosphere and the temperature of 600-1300 DEG C, dissolving in water or an alkali solution under a condition of room temperature-250 DEG C, washing, and drying, to prepare the TiB2 ceramic powder. The reductant is one or more of silicon powder and aluminum powder; the titanium source is one or more of Ti powder and TiO2 powder; the boron source is one or more of boron oxide, boric acid, sodium tetraborate, potassium tetraborate and lithium tetraborate; the alkali metal compound-containing molten salt is one or more of sodium hydroxide, sodium silicate, sodium carbonate, potassium hydroxide, potassium silicate, potassium carbonate, lithium hydroxide, lithium silicate, lithium carbonate and sodium aluminate. The preparation method has the advantages of low production cost, environmental friendliness and easy industrialized production, and the prepared product has small particle size and narrow particle size distribution.

The invention discloses a nitric acid reduction device, which comprises a shell, wherein a liquid inlet, a liquid outlet, an air inlet and an air outlet are formed in the shell; N packing layers are sequentially arranged in the shell up and down; a drop-leaching device is arranged in an inner cavity between two adjacent packing layers in the shell; the drop-leaching devices are connected with a circulating pump arranged outside the shell through pipes respectively; the air inlet is located in the lower part of the bottom packing layer; the air inlet is communicated with an NO gas inlet pipe; the air outlet is located in the top of the shell and is communicated with an exhaust pipe; a gas heat exchanger capable of cooling gas which passes through the packing layers is arranged in the inner cavity between the upper parts of the packaging layers and the air outlet; the liquid inlet is located in the shell between the gas heat exchanger and the packing layers; the liquid inlet is communicated with an inlet pipe capable of introducing mixed liquid of methanol and a nitric acid; the liquid outlet is located in the bottom of the shell and is communicated with the circulating pump through a pipe; and N is a natural number greater than 2. The nitric acid reduction device has the advantages of small occupied space and high nitric acid reduction efficiency, the reduced nitric acid can be utilized in cycle and a catalyst is not used.

The invention discloses a device and method for improving the production efficiency of titanium sponge and reducing energy consumption. A device containing a fusibility column is arranged in the axis part of an existing reduction distillation furnace reactor and comprises two parts including the fusibility column and a reactor upper cover leading-out sleeve. The fusibility column (a metal magnesium ingot) located in the center part of liquid magnesium metal absorbs reaction heat and is gradually fused in the magnesium heat reduction process, and meanwhile a hole is formed in the axis of a titanium sponge mixing body. The device and method solve the problem that a large amount of heat gathered in the center area of the magnesium heat reduction reactor is dissipated, and meanwhile the heat released through the magnesium heat reduction reaction is utilized for fusing the reduction agent magnesium metal ingot. The hole can be formed in the axis position of the titanium sponge mixing body, the diffusion path of magnesium metal left in the mixing body and magnesium metal is shortened, the distillation speed is increased, and the distillation period is shortened. By means of the device and method, preconditions are provided for the large scale of titanium sponge reduction distillation furnaces.

The invention discloses a garbage disposal device capable of utilizing self-circulation pyrolysis gas for preheating air. The device comprises a feeding opening, a garbage pyrolysis furnace wall, a first horizontal heat conduction plate, a vertical heat conduction plate, a first smoke circular pipeline, a top smoke circular pipeline connection opening, a tail gas pipeline connection opening, a second horizontal heat conduction plate, a second smoke circular pipeline, a first induced draft fan, an air preheating cavity connection opening, a first air inlet, a garbage pyrolysis furnace, an air preheating cavity, an exhaust opening, a horizontal air distribution pipeline, a tail gas treatment pipeline, a bottom smoke circular pipeline connection opening, a second induced draft fan, an observation window, a vertical air distribution pipeline, a settling pond, a tail gas purification device, an air distribution system, a smoke circular system and other structures. According to the disposal device, the reduction reaction efficiency is improved, the garbage heat treatment efficiency is ensured; and meanwhile, the self-circulation pyrolysis gas can be used for preheating the air, it can be ensured that low-heat-value components such as aromatic alcohol and heavy oil can be sufficiently decomposed in the reaction, and pollutant emissions in the tail gas can be reduced.

The invention relates to a preparation method of amorphous boron powder. The preparation method comprises the following steps: uniformly mixing a reducing agent, a boron-containing compound and an alkali metal compound-containing molten salt according to a mass ratio of 1.0:(1.2-3.6):(0.2-16.0), carrying out heat treatment in a protective atmosphere at 600-1300 DEG C for 0.5-8 h, dissolving the obtained product in water or an alkali solution at a temperature of room temperature to 250 DEG C, and performing filtering, washing and drying to obtain the amorphous boron powder. The preparation method has the characteristics of low production cost, environmental protection, easiness in industrial production, recycling of reaction byproducts and high boron recovery rate, and the prepared amorphous boron powder has the advantages of small particle size, narrow particle size distribution and high purity.

In an NOx purification system and a method for control of the NOx purification system, two oxidation catalysts 4, 5 are provided upstream of an ammonia solution supply unit 6, and the in-cylinder fuelinjection is so controlled that hydrocarbon in exhaust gas is mainly oxidized by the upstream oxidation catalyst 4 and nitric oxide in the exhaust gas is mainly oxidized by the downstream oxidation catalyst 5. In the purification of NOx in the exhaust gas by feeding an ammonia solution for NOx reduction to a selective reduction NOx catalyst 6, this technique enables the system to adjust the concentrations of HC, NO and NO 2 in the exhaust gas flowing into the selective reduction NOx catalyst 6 to proper values so as to purify the NOx efficiently by the selective reduction NOx catalyst 6. TheNOx purification performance in a lower temperature range can be thus improved.

The invention discloses a method for manufacturing polycrystalline silicon by reducing silicon chloride with an active metal. The invention aims to overcome the defects of the prior art and provides a method for manufacturing the polycrystalline silicon by reducing the silicon chloride with the active metal, wherein the method has less energy consumption, simple process and low cost. The method comprises the following steps of: reducing the silicon chloride with the active metal, separating and washing reactants to obtain silicon powder, distilling and purifying the obtained silicon powder in vacuum, and separating silicon from the active metal and other impurities in the silicon through vacuum distillation to enable the purity of the silicon to reach the silicon purity requirement of a solar battery or an electronic industry. The method is used for manufacturing a polycrystalline silicon raw material for the solar battery or the electronic industry.

The invention discloses a car tail gas purifying device, and belongs to the field of automotive exhaust emission reduction. The car tail gas purifying device comprises a purifying ejector, a purifying room and a purifying tank for providing purifying matter for the purifying room. The purifying tank communicates with an adsorption cavity of the purifying ejector. The input end of the purifying ejector is connected with an engine exhaust pipe. The output end of the purifying ejector is connected with a gas inlet channel of the purifying room. The interior of the purifying room is divided into a plurality of purifying chambers through separation plates. The purifying chambers communicate through inner cavity channels. Tail gas enters the purifying room through the gas inlet channel, and the tail gas is exhausted out of a gas outlet channel after circularly flowing in all the purifying chambers to be purified. The car tail gas purifying device has the beneficial effects that zero emission of harmful mater of tail gas is achieved, engine power is further improved, combustion efficiency and fuel economy are improved, and cost is low.

The invention discloses a method for removing acidic high-concentration mercury-containing waste water. The method includes the following steps that firstly, waste water containing divalent mercury is collected to a reaction vessel which is resistant to acid and alkali and good in ultraviolet permeability, sodium chloride is added into the waste water, a complexation reaction is performed under the stirring condition, fulvic acid is added after the complexation reaction ends, then the vessel is placed in a photo-chemical reaction device, a photo-chemical reduction reaction is performed under the stirring condition, the divalent mercury in the waste water is reduced into mercury protochloride to be recycled, and supernatant obtained after solid and liquid separation is treated effluent. The method solves the problem that the acidic high-concentration mercury-containing waste water pollutes the environment and has the advantages that the technology is simple, implementation is easy and the technology take effect fast, mercury in waste water can be economically and efficiently removed under the acidic condition, mercury in waste water can also be recycled, it is also possible that acid is recycled in the treated effluent, and economic benefits and environmental protection benefits are good.

The invention relates to an ammonia reducing agent storage device in an NH3-SCR system of a diesel powered car, belonging to the technical field of controlling the pollutant emission of diesel engine tail gas. The device is composed of an inner barrel and an outer barrel, a stainless steel mass transfer tube is arranged at the axle center of the inner barrel, an annular space between the stainless steel mass transfer tube and the inner barrel functions as an adsorbent bed for placing CaCl2 adsorption working medium and NH3 is adsorbed on CaCl2. After being hermetically connected with an inner barrel cover, the inner barrel is placed in an outer barrel. An annular space between the inner barrel and the outer barrel serves as the place where exhaust gas of the diesel engine heats the inner barrel, the exhaust gas enters the barrel from an air inlet at the bottom of the outer barrel to heat the inner barrel and then is discharged from an air outlet at the upper part of the outer barrel, and after adsorption stripping, NH3 is discharged from an air duct through the stainless steel mass transfer tube. The ammonia reducing agent storage device can directly provide NH3 reducing agent for the SCR system and solves the problem of low utilization rate of ammonia reducing agent; the storage device is simple in structure, safe and reliable; by adopting the exhaust gas of the diesel powered car as a heating source, energy can be saved; as the inner and outer barrels are convenient to dismantle, the service condition monitoring and replacement of adsorbents can be realized.

The invention relates to a desulfurization waste liquid treatment and reuse system. The desulfurization waste liquid treatment and reuse system includes a desulfurizing tower, a filter pressing device, a reduction tower, a desulfurization waste liquid distributing device, an aeration device, a heating device, a flocculant charging device, a sedimentation basin, a desulfurization waste liquid waterpump and a reduction liquid water pump, wherein the desulfurizing tower is provided with a flue gas inlet, a desulfurizing agent inlet, a desulfurization waste liquid outlet and an exhaust port, a tower body of the reduction tower is provided with a flocculant inlet, the desulfurization waste liquid distributing device is arranged in the tower body, the aeration device is provided with an aeration nozzle group located on the lower side of the desulfurization waste liquid distributing device, the sedimentation basin is provided with a reduction liquid cleaning water pump, an inlet of the desulfurization waste liquid water pump communicates with the desulfurization waste liquid outlet, and an inlet of the reduction liquid water pump communicates with an inner cavity of the reduction tower;and a waste residue outlet of the sedimentation basin communicates with the filter pressing device, an outlet of the desulfurization waste liquid water pump communicates with the desulfurization wasteliquid distributing device, an outlet of the reduction liquid water pump communicates with a reduction liquid inlet of the sedimentation basin, and an outlet of the reduction liquid cleaning water pump communicates with the desulfurizing agent inlet. According to the desulfurization waste liquid treatment and reuse system, treatment and reuse of desulfurization waste liquid are convenient, the amount of a desulfurizing agent is small, and the desulfurization effect is good.

The invention relates to the technical field of metal smelting, in particular to production equipment and process of zirconium sponge. The production equipment of zirconium sponge comprises a channelfor connecting a sublimation furnace with a first reduction furnace, wherein molten liquid magnesium is placed in a furnace pipe, a furnace cover is provided with a magnesium feeding port, a liquid magnesium outlet, a temperature and pressure measuring device, inert gas supply equipment and a gas inlet pipe connected in a sealed mode, the gas inlet pipe is provided with a gas pump and a second one-way valve, a gas explosion pipe is arranged on the lower side of the gas inlet pipe, a gas pipe branch is arranged between the gas inlet pipe and the second one-way valve, a third one-way valve and astorage box for providing an explosion body are arranged on the gas pipe branch, and the explosion body is ejected out from the bottom of the gas explosion pipe by pressure of inert gas and explodesin magnesium liquid in the furnace pipe to accelerate reduction reaction. The production efficiency and quality of the zirconium sponge are improved, and good economic benefits and social benefits areachieved.

The invention discloses a motor vehicle exhaust purifying device, and belongs to the field of motor vehicle exhaust emission reduction. The motor vehicle exhaust purifying device comprises a purifying ejector, a purifying chamber and a purifying tank (27) for providing purifying matter for the purifying chamber. The purifying tank (27) is communicated with an adsorption cavity (2) of the purifying ejector, the input end of the purifying ejector is connected with an engine exhaust pipe, the output end of the purifying ejector is connected with a gas inlet channel (10) of the purifying chamber, the interior of the purifying chamber is divided by partition plates into a plurality of purifying cavities, the purifying cavities are communicated through inner cavity channels, and exhaust enters the purifying chamber through the gas inlet channel (10) and circularly flows in the purifying cavities to be purified to be emitted out through a gas outlet channel (11). The motor vehicle exhaust purifying device has the advantages that zero emission of exhaust harmful substance is achieved, the power of an engine is further improved, the combustion efficiency and the fuel economy are improved, and cost is low.

An embodiment of the invention relates to a metallofullerene nitroxide free radical derivative as well as a preparation method and an application thereof. The metallofullerene nitroxide free radical derivative in the embodiment can efficiently produce electron transfer under irradiation of visible light, so that a NO free radical turns into NO+ with certain catalytic oxidation activity, and efficient and high-selectivity catalytic conversion of alcohol compounds into aldehyde compounds is realized under the mild condition. Meanwhile, the metallofullerene nitroxide free radical derivative catalyst can replace functions of multiple reported catalysts in a catalyst system taking the nitroxide free radical as one of catalysts; besides, the dose of the metallofullerene nitroxide free radical derivative catalyst is basically 1 / 10 of that of NO free radical catalysts in the prior art, but similar or better effects can be realized.

The invention relates to a device and method for smelting metal through a thermal reduction method, and belongs to the technical field of metal smelting. The device and method for smelting the metal through the thermal reduction method are provided, and the device comprises a smelting furnace 1, a heating device 2, a mineral powder injection device 3, a reducing agent injection device 4, a slag former injection device 5, a metal discharging device 6 and a tail gas guiding device 7. The device can directly spray mineral powder and a reducing agent into a smelting furnace, heating is quickly conducted in the furnace to the reduction temperature, the reducing agent and the mineral powder are sufficiently contacted to produce reduction reaction, and reducing metal and slag fall into the bottom of the furnace to be layered and are discharged out of the furnace at regular time. When the device is used for smelting the metal by the thermal reduction method, the process energy consumption can be reduced, the contact area of the reducing agent and the mineral powder can be increased, the dynamic conditions of reduction reaction are greatly improved, the metal is quickly reduced, and the efficiency of the reduction reaction is improved.

The invention discloses a device and a method for preparing high-purity nano ZnO through hydrogen circulation reduction. The device comprises a reduction furnace, a solid-liquid separation and vaporization furnace, a waste heat recoverer and an oxidation bin, wherein a bottom plate of the reduction furnace is a first porous plate; a heater is arranged on the outer side of the solid-liquid separation and vaporization furnace; the reduction furnace is connected with a feeding bin; a hydrogen bin is arranged at the lower part of the first perforated plate; the solid-liquid separation and vaporization furnace comprises an internal rotary drum which is connected with the reduction furnace, and the side wall of the internal rotary drum is a second perforated plate; an interlayer is formed between the inner wall of the solid-liquid separation and vaporization furnace and the second perforated plate; a waste heat recovery bin connected with the internal rotary drum is arranged in the waste heat recoverer; the oxidation bin is respectively connected with the interlayer, the nano zinc oxide condensation collector and the water vapor condenser; the water vapor condenser is connected with a condensed water reheating pipeline connected with the waste heat recoverer, a hydrogen recovery pipeline connected with the hydrogen bin and a hydrogen water vapor conveying pipeline connected with the reduction furnace; and the waste heat recoverer is connected with a water vapor regeneration and recovery pipeline. The method is short in process and low in energy consumption, and the prepared nano ZnO is high in purity.

The invention discloses an electrode catalyst and a preparation process thereof. The composite electrode uses foamed metal or alloy materials such as foamed titanium, foamed nickel and foamed stainless steel sheets as the electrode substrate, and after processing, an air diffusion layer is prepared on one side of the substrate and the other is One side is conductive, and on the surface of the conductive side, the flame smoke particles generated by the combustion of fuel such as paraffin, gasoline, diesel or kerosene mixed with organometallic chemicals are smoked, and the catalytic layer is prepared on the conductive side of the electrode substrate. The surface of the layer is impregnated with fuel and burned and calcined to obtain a composite electrode with the catalytic layer firmly attached. The composite electrode prepared by the invention has the advantages of simple preparation process, uniform loading of the electrode catalyst, no need to use any binder and current collector, higher mechanical strength and electrical conductivity, and better practical application.

The invention discloses a laterite gas base reduction apparatus which comprises a pelletizing device, a reduction device and a coke furnace raw gas generator, wherein the pelletizing device is used for pelletizing laterite-nickel ore, binding agent, reduction coal and regulator; the reduction device is connected with the pelletizing device, and a reduction reaction chamber is defined in the reduction device so as to receive pellets from the pelletizing device; and the coke furnace raw gas generator is connected with the reduction device, and used for introducing coke furnace raw gas into the reduction reaction chamber. The laterite-nickel ore smelting apparatus disclosed by the embodiment of the invention can effectively smelt laterite-nickel ore to obtain ferronickel alloy by utilizing the coke furnace raw gas.

The present invention discloses an electrode catalyst and a preparation process of the electrode catalyst. A composite electrode takes a foamed metal or alloy material, such as foamed titanium, foamed nickel and a foamed stainless steel sheet, etc., as an electrode substrate, an air diffusion layer is prepared at one side of the substrate after treatment, and the other side of the substrate is conductive. Flame smoke particles generated by the combustion of the fuels, such as paraffin, gasoline, diesel oil or kerosene mixed with organic metal chemicals, etc., are mixed on the conductive side surface by roasting, the catalytic layer is prepared at the conductive side of the electrode substrate, and the composite electrode with the catalytic layer firmly attached is prepared through the procedures of fuel dipping combustion and calcination on the surface of the catalytic layer. The prepared composite electrode has the advantages that the preparation process is simple, the electrode catalyst is uniformly loaded, no binder or current collector is needed, and the composite electrode has higher mechanical strength and conductivity and can be better applied in practice.

The invention discloses a method for treating hexavalent chromium pollution in water. The method includes following steps: homogenizing and acidifying wastewater containing hexavalent chromium, and adding a reducing agent composed of ferrous sulfate, polyphosphorus ferric chloride and urea for redox reaction; adding alkali to redox reaction liquid for flocculation precipitation reaction, and allowing supernate after flocculation precipitation to enter a biological reaction tank for biological reaction under action of medical stone powder, lignin powder and activated sludge in the biological reaction tank to obtain wastewater after being treated. By the method, various physiochemical indexes of the wastewater after being treated can reach discharging standards, COD, BOD, SS and hexavalent chromium ion content is lowered effectively. The method is simple in treatment process, low in agent consumption, good in treatment effect, stable in performance and good in outgoing water quality andhas great application prospect.

The invention relates to the technical field of metal smelting, in particular to a production equipment and process of zirconium sponge. The production equipment of a kind of sponge zirconium provided by the present invention comprises the channel that connects the sublimation furnace and the first reduction furnace; The temperature and pressure device, the equipment for supplying inert gas, and the airtightly connected air inlet pipe. The air pump and the second one-way valve are arranged on the air inlet pipe, and the gas explosion pipe is arranged on the lower side of the air inlet pipe. Between the air inlet pipe and the second one-way valve There is a trachea branch, the trachea branch is equipped with a third one-way valve and a storage box for providing explosives, and the explosives are ejected from the bottom of the gas explosion tube by the pressure of inert gas and explode in the magnesium liquid in the furnace speed up the reduction reaction. The invention improves the production efficiency and quality of the zirconium sponge, and achieves good economic and social benefits.

The invention relates to the technical field of diether type organic compounds, in particular to a preparation method of an alkyl-substituted diether type electron donor. The method comprises the following specific reaction steps: under the catalytic action of organic alkali, adding a compound b into a compound a, and carrying out an alkylation reaction of carbonyl alpha-carbon to obtain a compound c; carrying out ester reduction reaction on the compound c to obtain a compound d; and carrying out etherification reaction on the compound d and a compound e under the action of inorganic alkali to obtain a diether compound f. According to the invention, the alkyl diethyl malonate is adopted as a raw material and can be used for various alkyl-substituted diether electron donors, the intermediate treatment process is simple, other noble metal catalysts are not used, the product yield is high, the reaction route is short, and the preparation cost is low.