136 results about "Raney nickel" patented technology

The invention discloses application of a Ni-based reverse-phase catalyst in catalytic hydrogenation reaction of a nitro compound, nitro in the nitro compound is hydrogenated to reduce amino, the Ni-based reverse-phase catalyst is of an M / Ni reverse-phase structure, metal Ni for dissociating hydrogen serves as a carrier, nano metal M oxide is loaded on the carrier to serve as a loading phase, and reverse-phase interface active sites are constructed; wherein the metal M is one or two of Ce, Zr, Al, Y and Mg, and the mole fraction of the load phase metal M is 5-50% based on the mole fraction of all the metals in the catalyst being 100%. The preparation method of the catalyst is simple and easy to implement, the catalyst has a non-traditional supported reversed-phase structure, the activity of the catalyst is more excellent than that of a traditional supported catalyst when the catalyst is applied to the nitro-compound hydrogenation process, a traditional Raney nickel catalyst can be effectively replaced, a reaction system is clean and safe, repeatability is good, effective recycling can be achieved, and the catalyst is suitable for industrial production. The method is suitable for industrial production and has a good application prospect.

The invention provides a catalyst, a preparation method and application thereof, and a method for preparing primary amine by catalyzing nitrile compound hydrogenation, and particularly relates to the technical field of catalyst synthesis. The catalyst comprises a nickel / cobalt-based catalyst and a metal salt; wherein the nickel / cobalt-based catalyst is selected from any one of a supported nickel / cobalt-based catalyst, a Raney nickel / cobalt catalyst or a nickel / cobalt nanocrystal; the metal salt comprises any one or a combination of at least two of tungsten salt, molybdenum salt, vanadium salt, aluminum salt and cerium salt. The metal salt and the nickel / cobalt main catalyst have a synergistic effect: the surface electron density is adjusted through electron transfer, the hydrogen dissociation and cyano adsorption activation capacities are enhanced, the hydrogenation activity is improved, and the mild condition reaction is assisted; the surface chemical environment is changed or steric hindrance is borrowed, the primary amine selectivity is improved, and byproducts are inhibited; aluminum salt, cerium salt and the like inhibit nickel / cobalt agglomeration, increase active sites, enhance stability, prolong the service life and reduce the dosage.

The invention belongs to the field of electrode materials, and particularly relates to an alkaline hydrogen production electrode and a preparation method thereof.The alkaline hydrogen production electrode comprises an electrode substrate and a catalyst loaded on the electrode substrate; the catalyst comprises the following components: Ni, Fe, Mo, Cr and Mn, the molar percentage of Mo is 5-15%, and the total molar percentage of Fe and Mo is 35%. By alloying, introducing Mo and controlling the content of Fe and Mo, the catalytic activity is enhanced, compared with existing binary Raney nickel, the catalytic activity is higher, the HER reaction overpotential can be effectively reduced, so that the energy consumption of an electrolytic bath is reduced, and the corrosion resistance of an electrode can be enhanced through Cr and Mn.

This invention relates to a method for preparing hexamethylenediamine by hydrogenation of adiponitrile in the presence of a Raney nickel catalyst, wherein a Raney nickel catalyst modified by treatment with carbon monoxide or carbon dioxide in a liquid medium is used.

The invention relates to the technical field of sugar alcohol preparation, and discloses a preparation method of high-purity crystalline maltitol, which comprises the following steps: firstly, by taking corn starch milk as a raw material, preparing ultrahigh-content maltose syrup with the maltose content of more than or equal to 91%, the wheat triose content of less than or equal to 0.4% and the glucose content of less than or equal to 4% through an enzyme conversion method; carrying out hydrogenation reaction on the syrup by adopting a Raney nickel catalyst, and controlling the hydrogenation side reaction to be 2% or below, so as to obtain hydrogenated liquid with maltitol content of more than or equal to 88%; and then, a pigment separation procedure in a traditional process is omitted, and the hydrogenated liquid is directly subjected to decoloration, ion exchange, evaporation concentration, crystallization, centrifugation and drying treatment to finally prepare crystalline maltitol. According to the method, by screening a specific compound enzyme system and finely regulating the pH value and temperature control environment of a saccharification reaction system, the generation of maltose is effectively promoted, and side reactions such as excessive hydrolysis of glucose and reverse synthesis of trisaccharide are inhibited at the same time, so that the high-purity maltose syrup precursor is obtained.

The invention relates to a process for the manufacturing of biobased 3-methyl-delta-valerolactone (3MdVL) and 3-methyl-1,5-pentanediol (3MPD) via one- pot hydrogenation of anhydromevalonolactone (aMVL) in the presence of a Raney- Nickel catalyst. The hydrogenation occurs without solvent at a temperature from 120ºC-180ºC, preferably at 130ºC-170ºC and a pressure between 15-30 bar, preferably at a pressure between 18 and 22 bar. The hydrogenation time may vary between 3 and 25 hours, preferably between 6 and 24 hours.

The invention relates to a carbobenzoxy deprotection reaction method and application, and belongs to the technical field of catalytic chemistry. The method comprises the following steps: dissolving a raw material Cbz epoxy in ethanol, carrying out high-temperature reflux stirring treatment, transferring the obtained product into a reaction kettle, adding Raney nickel, charging and discharging nitrogen to discharge air in the kettle, charging and discharging hydrogen again, keeping the final pressure of the hydrogen in the reaction kettle at 1-2 MPa, after the room-temperature reaction is finished, filtering the Raney nickel to obtain a reaction liquid, dripping the reaction liquid to crystallize, and carrying out suction filtration and drying to obtain the product. The filtered Raney nickel is recycled and reused for at least 10 times after being treated at a high temperature, and new Raney nickel is replaced, so that the triangular balance of'catalytic performance-economic cost-process stability 'is realized, the production cost is reduced on the premise of not influencing the reaction effect, the used Raney nickel is recycled and reused after being properly treated, and the production cost is reduced. And the production cost is further reduced, and good economic benefits are achieved.

The present invention discloses a method for preparing 5-methyltetrahydrofurfuryl alcohol. The method uses 5-hydroxymethylfurfural (HMF) as a raw material and one or more of palladium on carbon, Raney nickel, and sulfonated silica as a catalyst. HMF, a reaction solvent, and the catalyst are added to a reactor. Amberlyst 15 strong acid resin is added as a second catalyst to provide an acidic environment. The reactor is stirred and reacted in a hydrogen atmosphere to produce 5-methyltetrahydrofurfuryl alcohol. The present invention provides a method for preparing 5-methyltetrahydrofurfuryl alcohol that is simple, easy to separate, high in purity, and high in yield. The addition of Amberlyst 15, a second catalyst, to the reaction provides an acidic environment without affecting the activity of the Raney nickel, thereby facilitating the cleavage of the carbon-oxygen bond to produce the target product, 5-methyltetrahydrofurfuryl alcohol (MTHFM). The synergistic effect of Amberlyst 15 and the Raney nickel catalyst greatly enhances the activity of the catalytic reaction.

The invention relates to the technical field of catalyst treatment, in particular to a Raney nickel catalyst reduction and passivation treatment system and a passivation method.The system comprises a deactivation pool, a hydrogenation reactor and a circulation pipeline which are connected in a closed loop mode; a sodium nitrate solution supply end, a temperature adjusting system and a multi-dimensional sensing assembly (a concentration sensor, a temperature sensor, a pH sensor, a pressure sensor, a flow sensor and the like) are arranged, and the core is a processing unit integrating a control module and a dynamic soft measurement model. The desalted water injection amount, the sodium nitrate solution concentration and the deactivation solution temperature are preset and dynamically optimized through the treatment unit, closed-loop circulation of a reaction system is achieved through a circulation pipeline, and the passivation process is judged based on the pH value change. According to the method, the passivation rate and the completion time are predicted by means of the dynamic soft measurement model, the optimal process parameters are output in a self-adaptive mode, and the problems that a traditional passivation method depends on artificial experience, and is low in safety and insufficient in efficiency are solved by combining a safety interlocking mechanism and a uniform mixing regulation and control strategy.

The present invention relates to a method for recycling waste lithium iron phosphate positive electrode powder for preparing a high-performance water electrolysis anode catalyst and extracting lithium elements, comprising the following steps: disassembling waste lithium iron phosphate batteries, peeling the positive electrode sheet from the current collector and grinding it; and coating the surface of the obtained lithium iron phosphate powder with a modified nickel compound. The obtained material is immersed in an oxidizing solution to leach the remaining lithium in the material, and the delithiated composite catalyst powder is collected. The lithium ion-containing soaking solution is further recrystallized to precipitate into lithium salts, thereby achieving lithium extraction. Compared with the prior art, the present invention achieves efficient lithium iron phosphate recovery and reuse, and the obtained composite structure catalyst has a significantly improved effect on the oxygen evolution reaction in water electrolysis than waste lithium iron phosphate powder, and its performance is superior to that of commercial Raney nickel electrocatalysts. In addition, compared with directly extracting lithium from waste lithium iron phosphate powder and then coating it with nickel compound, the composite structure catalyst of the present invention has better catalytic performance for the oxygen evolution reaction.

This invention provides a method for manufacturing electrode materials that have excellent water electrolysis performance in water electrolysis devices. [Solution] A method for manufacturing an electrode material used in the electrodes of a water electrolysis device includes a step of obtaining Raney nickel contained in the electrode material, and the step of obtaining Raney nickel includes an alkali treatment step of dissolving aluminum from the NiAl alloy with an alkaline substance. The component composition of the NiAl alloy, excluding unavoidable impurities, is the composition formula Al3Ni (2-x) Co x (x is 0

The application provides a high-porosity Raney nickel electrode and a preparation method thereof, and relates to the technical field of Raney nickel electrodes and preparation thereof. The preparation method of the high-porosity Raney nickel electrode effectively controls the dealuminization rate and the pore uniformity through a preparation process of'sintering treatment + special electrochemical dealloying treatment', and stably prepares the high-porosity Raney nickel electrode. A new process for preparing the high-porosity Raney nickel electrode in an environmentally friendly manner is provided, which replaces the traditional corrosion pore-forming process of a strong alkaline chemical solution and reduces pollution. The prepared high-porosity Raney nickel electrode has a high porosity of up to 52%, and the pore structure is stable, so that the catalytic activity and mechanical stability of the electrode are effectively improved.

This application discloses a method for preparing sodium dihydrobis(2-methoxyethoxy)aluminate, belonging to the field of organic synthesis technology. The method uses aluminum powder, ethylene glycol monomethyl ether, and metallic sodium as main raw materials, and carries out a hydrogenation reaction under the action of a Raney nickel catalyst to generate the target product, sodium dihydrobis(2-methoxyethoxy)aluminate. The sodium dihydrobis(2-methoxyethoxy)aluminate prepared by this process uses inexpensive and readily available raw materials, is simple to operate, and has a yield of over 98.5%. It boasts high yield, low cost, and a short process route, reducing production costs compared to existing technologies and making it suitable for industrial production.

This invention provides a method for manufacturing electrode materials that have excellent water electrolysis performance in water electrolysis devices. [Solution] A method for manufacturing an electrode material used in the electrodes of a water electrolysis device includes a step of obtaining Raney nickel contained in the electrode material, and the step of obtaining Raney nickel includes an alkali treatment step of dissolving aluminum from the NiAl alloy with an alkaline substance. The component composition of the NiAl alloy, excluding unavoidable impurities, is the composition formula Al3Ni (2-x) Cu x (x is 0)

The invention discloses a preparation method of 2-pyrrolidone, and belongs to the technical field of fine chemical engineering and catalysis. According to the method, maleimide is taken as a raw material, and 2-pyrrolidone is prepared by hydrogenation reaction under mild conditions in a 1, 4-dioxane solvent by utilizing the synergistic effect of a main catalyst Raney nickel and a cocatalyst rare earth Lewis compound; the mass ratio of 1, 4-dioxane to maleimide is (10: 1)-(2: 1), the mass ratio of maleimide to a Raney nickel catalyst is (1000: 1)-(100: 1), the molar ratio of maleimide to a rare earth Lewis compound is 1: 1, the hydrogen pressure is 2-4MPa, the reaction temperature is 140-180 DEG C, reacting for 16-24 hours, filtering and recovering Raney nickel after the reaction, and carrying out reduced pressure distillation to separate a solvent and a product, and the rare earth compound is recycled after being purified. According to the method, selective hydrogenation is achieved through the synergistic effect of the composite catalyst, the product yield reaches 95.3%-99.5%, the purity is larger than or equal to 99.2%, compared with a traditional method, the condition is mild, use of precious metal catalysts is avoided, the catalyst and the solvent can be recycled, and the production cost and pollution are reduced.

The invention belongs to the field of fluorine-containing pesticide synthesis, and particularly relates to synthesis of fluopyram. The fluopyram is innovatively synthesized by adopting a one-pot catalytic system, and the reaction process is as shown in the formula 1: 2-acetonitrile-3-chloro-5-trifluoromethylpyridine (1) and o-trifluoromethyl benzoyl chloride (2) are used as initial raw materials, a catalyst with a specific structure and an alkali-binding acid agent are added into an ionic liquid, and a reaction is performed at the temperature of 60-80 DEG C for 1-2 hours to obtain the fluopyram. And preparing the target product fluopyram (3) by a high-efficiency one-pot method under the catalytic action of a supported metal catalyst in a hydrogen atmosphere. According to the one-pot synthesis process of fluopyram, the reaction is clean and pollution-free, the operation is simple and convenient, the utilization rate of raw materials is high, and the application frequency of Raney nickel can be increased under the condition that the yield is not influenced through a reaction system formed by combining water and an organic solvent. The o-trifluoromethyl benzoic acid recovered from the water phase can be further converted into o-trifluoromethyl benzoyl chloride, so that the utilization rate of the raw materials is improved. The synthesis process route is effectively shortened, and meanwhile, the use of expensive protection groups for protection in the hydrogenation reduction process is avoided, so that the process is more simplified.

The utility model relates to the technical field of Raney nickel catalyst separating and charging, in particular to a Raney nickel catalyst separating and charging device which comprises a crane, an electric hoist, a separating device, a frame platform and a BDO reactor, the separating device and the electric hoist are fixedly installed on the top of the frame platform, and the electric hoist is arranged on the right side of the separating device. The crane is arranged on the ground on the right side of the frame platform, an outlet in the left end of the separating device is fixedly communicated with a discharging pipeline which is inclined in a right-high left-low shape, and an outlet of the discharging pipeline is formed above an inlet in the top of the BDO reactor. The device is reasonable and compact in structure and convenient to use, can improve the separation and charging efficiency of the Raney nickel catalyst, further improves the production efficiency of a BDO reactor, reduces the working intensity of workers, and has the characteristics of safety, labor saving, simplicity, convenience and high efficiency.

The application discloses a method for synthesizing benoxacor, and belongs to the technical field of chemical organic synthesis. The method comprises the following steps: taking DMF as a solvent, fully reacting ortho-nitrophenol with monochloroacetone and alkali at a certain temperature, centrifuging after the reaction is completed, obtaining a first filter cake and a DMF solution of 2-nitro-2-phenoxypropanone, removing part of the DMF through vacuum distillation, detecting the content of chloroacetone in the gas chromatograph, and adjusting the mass concentration of the 2-nitro-2-phenoxypropanone DMF solution to 10-20% after the content of chloroacetone is detected to be lower than 0.02% by using the area normalization method; then, adding Raney nickel into the 2-nitro-2-phenoxypropanone DMF solution, and performing hydrogenation reaction by passing hydrogen; after the reaction is completed, the upper clear liquid is extracted, and 3,4-dihydro-3-methyl-2H-1,4-benzoxazine DMF solution is obtained through filtration; then, an acid-binding agent alkali is added, and acylation reaction is performed by dropwise adding dichloroacetyl chloride, so as to synthesize benoxacor. The method can greatly simplify the operation process of frequently changing solvents in the process of synthesizing benoxacor, and can avoid the generation of a large amount of waste brine.

The present invention provides a Raney nickel and a passivation treatment method and application thereof. The passivation treatment method comprises: transferring the sealed Raney nickel to a drying oven equipped with an air pump for drying treatment, and controlling the air flow rate in the drying oven to 100 mL / min to 5000 mL / min to purge the Raney nickel during the drying treatment; and continuously drying until the Raney nickel is converted into powder to obtain a passivated Raney nickel catalyst. The membrane electrode prepared from the Raney nickel obtained by the passivation treatment of the present invention has high activity in the electrohydrolysis reaction. The passivation treatment method of the present invention increases the specific surface area of ​​the Raney nickel catalyst by controlling the drying temperature in the passivation treatment and the air flow rate in the purge process, thereby overcoming the problems of spontaneous combustion of traditional Raney nickel when it comes into contact with air during transportation and production.

The invention discloses vanillin alcohol ether and a preparation method thereof, and the preparation method comprises the following steps: (1) by taking vanillin or ethyl vanillin and hydrogen as reactants and alcohol or ethyl acetate (EA) as a solvent, preparing a reactant solution, adding a Raney nickel catalyst as a catalyst, and reacting at the temperature of 40-70 DEG C under the reaction hydrogen pressure of 2-3 MPa for 8-10 hours; and (2) by taking vanillin alcohol or ethyl vanillin alcohol and second alcohol as reactants and lewis acid (such as magnesium chloride, aluminum chloride, calcium chloride, ferric chloride, copper sulfate and other lewis acids) as a catalyst, reacting at 80-100 DEG C to obtain vanillin alcohol ethers, the preparation method disclosed by the invention is mild in reaction condition, few in by-products, green and environment-friendly, high in product yield and suitable for industrial production.

The utility model discloses a solid catalyst feeding device which comprises a reaction kettle, a jet orifice of the jet pump is connected with an inlet of the reaction kettle through a pipeline; the catalyst feeding bin and the liquid raw material bin are respectively connected with an inlet of the injection pump through a pipeline and a valve pipeline; the first nitrogen supply equipment is connected with the catalyst feeding bin through a pipeline; and the first industrial water supply equipment is connected with the catalyst feeding bin through a pipeline. The stirring paddle is arranged in the Raney nickel feeding bin, so that unsmooth feeding caused by long-time Raney nickel deposition is prevented. By arranging the nitrogen seal, after feeding is finished, replacement is conducted through nitrogen, and the accident risk caused by air residues in the system is avoided.

The invention provides a synthetic preparation method of 3, 3 '-diaminodipropylamine (DPTA), which is efficient, safe, low in cost and easy to industrially amplify. The method is realized through two-step reaction: firstly, preparing 18-22% ammonia water in a water phase system under the conditions that the temperature is controlled to be 40-50 DEG C and the pressure is less than or equal to 0.3 MPa, then dropwise adding acrylonitrile into the ammonia water for reaction under the conditions that the temperature is 60-65 DEG C and the pressure is less than or equal to 0.5 MPa to generate a high-purity DPTAm intermediate, and carrying out rectification dehydration to obtain a dehydrated synthetic liquid containing more than or equal to 95 wt% of DPTAm; then in a hydrogenation reaction, isopropanol is used as a solvent, Raney nickel is used as a catalyst, KOH or NaOH is used as an auxiliary agent, under the guarantee of nitrogen and hydrogen replacement, the DPTAm dehydrated substance is dropwise added at a constant speed for catalytic hydrogenation under the conditions of 80-85 DEG C and 2.2-2.6 MPa, and after the reaction is completed, desolvation, light component removal and rectification purification are performed to obtain the target product DPTA. According to the method, high-selectivity synthesis of DPTAm is achieved, generation of by-products is remarkably reduced, ammonia gas consumption and recovery cost are reduced, meanwhile, the hydrogenation process is optimized, the conversion rate and yield are improved, the DPTA content is larger than or equal to 96%, and the total yield is larger than or equal to 95%. The Raney nickel catalyst can be repeatedly used for more than 50 batches, has stable activity, greatly reduces the production cost, and is suitable for large-scale industrial application.

The invention provides a catalyst, a preparation method and application thereof, and a method for preparing primary amine by catalyzing nitrile compound hydrogenation, and particularly relates to the technical field of catalyst synthesis. The catalyst comprises a nickel / cobalt-based catalyst and nickel / cobalt carbide coated on the surface of the nickel / cobalt-based catalyst, wherein the nickel-based / cobalt-based catalyst is selected from any one of a supported nickel / cobalt-based catalyst, a Raney nickel / cobalt catalyst or a nickel / cobalt nanocrystal; a carbon source used in the nickel / cobalt carbide is any one or a combination of at least two of a gaseous carbon source, a liquid carbon source and a solid carbon source. The catalyst not only has high activity and good selectivity, but also can inhibit agglomeration and sintering of nickel / cobalt and prolong the service life of the catalyst, so that the efficiency and selectivity of hydrogenation reaction are improved, side reactions are reduced, the production cost is reduced, and powerful support is provided for industrial application of hydrogenation.

The invention provides a rare earth doped Raney nickel electrode, a preparation method and application. The preparation method comprises the following steps: roughening a conductive substrate; spraying and depositing the composite powder on the conductive base material by adopting a spraying process to obtain a coating conductive base material; the coating conductive base material is placed in an alkaline solution for activating treatment, and the rare earth doped Raney nickel electrode is obtained; wherein the composite powder comprises powder of nickel powder, aluminum powder and rare earth components. By introducing the rare earth component, the electronic structure of nickel can be improved, the conductivity and catalytic activity of the electrode are improved, and the hydrogen evolution overpotential is reduced. And the powder with different particle sizes forms a dense and uniform coating layer by layer through the spraying process, so that the corrosion resistance and the mechanical strength are enhanced. Complex equipment and high cost are not needed, the adding amount of rare earth elements is small, and the method is suitable for large-scale industrial production.

The invention belongs to the technical field of medicine synthesis, and discloses a preparation method of cinacalcet hydrochloride impurities. According to the preparation method, the safety of the operation process is high, risks caused by raney nickel use and high-pressure hydrogenation in the prior art route are effectively avoided, meanwhile, the yield and purity of the product both reach the high level, and the dual requirements for process safety and product quality are met.

The utility model belongs to the technical field of spraying, and particularly relates to a Raney nickel uniform spraying device which comprises a box body, first limiting sliding grooves are formed in the inner wall of the top and the inner wall of the bottom of the box body, first sliding blocks are arranged in the two first limiting sliding grooves, a first hollow pipe is connected between the two first sliding blocks, and a second hollow pipe is connected between the two first sliding blocks. A plurality of spray heads are connected to the first hollow pipe, each spray head is provided with a first one-way valve, fixing blocks are installed on one sides of ports of the upper first limiting sliding groove and the lower first limiting sliding groove, threaded rods are rotatably installed on the fixing blocks and the side wall of the box body in a matched mode, and the threaded rods penetrate through the first sliding blocks; one end of each of the two threaded rods is sleeved with a belt pulley; when the ceramic spraying device is used, the distance between the spraying head and the ceramic can be adjusted according to the ceramic of different sizes through the arrangement of the spraying head adjusting mechanism, so that the optimal spraying distance is achieved, the coating uniformity can be ensured through accurately adjusting the position of the spraying head, and the spraying quality is ensured.

The application provides a double-layer Raney nickel electrode, a preparation method and application. 3+ The preparation method of the double-layer Raney nickel electrode comprises the following steps: providing a conductive base material; immersing the conductive base material in a solution containing Fe ions to perform a surface uniform etching reaction, so as to obtain an iron modified conductive base material; loading a Raney nickel type alloy powder on the iron modified conductive base material, so as to obtain a composite conductive base material; immersing the composite conductive base material in an alkaline solution to perform an activation reaction, so as to obtain the double-layer Raney nickel electrode. The double-layer Raney nickel electrode prepared by the application has high stability and high catalytic activity, has a good effect in electrolysis of water to generate hydrogen, and has high generation efficiency. Moreover, the preparation method of the application is simple, convenient to operate, and suitable for industrial production.

The embodiment of the present application discloses a preparation method of nor-tropine alcohol. The method comprises the following steps: performing demethylation reaction on tropinone and chloroethyl chloroformate in the presence of a solvent, performing vacuum concentration and evaporation, and obtaining demethyltropinone; performing reduction reaction on the demethyltropinone and lithium tri-t-butoxyaluminum hydride in the presence of a solvent, and obtaining the nor-tropine alcohol. The present application adopts a new type of reducing agent lithium tri-t-butoxyaluminum hydride, which is safe, not sensitive to air and water, and simple in post-treatment, thus avoiding safety hazards from the source. The present application avoids the use of dangerous Raney nickel and does not need to use an autoclave, so that the production capacity is greatly improved. The present application performs the reaction under low-temperature conditions, is low in energy consumption, can effectively reduce production cost, and is moderate in reaction conditions, safe and simple in operation, and is conducive to large-scale industrial production.

The application provides a Raney nickel electrode and a preparation method and application thereof, and relates to the field of hydrogen production by electrolysis of water. An electrode substrate with a Raney nickel catalytic layer on the surface is subjected to heat treatment to obtain a heat-treated electrode; an alkali solution, an additive and the heat-treated electrode are mixed, activated, washed and dried to obtain the Raney nickel electrode; the volume concentration of oxygen in the heat treatment is gradually reduced until a low-oxygen atmosphere or an oxygen-free atmosphere, and the temperature is gradually increased. By introducing a controllable gradient heat treatment process before alkali activation, sufficient diffusion between Ni and Al is promoted to form a specific content stable Ni3Al phase, the Ni-Al synergistic structure in the Ni3Al phase can regulate the surface electronic structure to a certain extent, improve the distribution of active sites on the electrode surface, and improve the hydrogen evolution and oxygen evolution performance. In addition, while ensuring the integrity of the porous electrode skeleton structure, the alloying degree is improved.

The application discloses a method for preparing trimethylolamine by a continuous flow method, and comprises the following steps: mixing polyformaldehyde and alkali to obtain a mixed solution 1; mixing a nitromethane solution and the mixed solution 1 to form a reaction solution, and then introducing the reaction solution into a micro-channel continuous flow reactor to obtain a mixed solution 2 after reaction; adjusting the flow rates of the mixed solution 2 and hydrogen, and then mixing the gas-liquid mixture into a gas-liquid mixer at the inlet of a micro-packed bed continuous flow reactor, passing through a catalyst bed layer of the micro-packed bed continuous flow reactor to react, and then adjusting the temperature through a reactor heat exchange cavity of the micro-packed bed continuous flow reactor to obtain a crude product after reaction, and then performing post-treatment and purification to obtain a trimethylolamine product; and the catalyst comprises a supported Pd catalyst, a supported Ni catalyst or a Raney nickel catalyst. The preparation method of the application enables the solid catalyst to fully contact with the mixed solution 2 and hydrogen, compared with a conventional intermittent hydrogenation preparation method, the reaction time is shortened, the product purity is high, the safety is high, and the method is beneficial to industrialized scale production.