31 results about "Methylamine" patented technology

The present application relates to the technical field of urea preparation, and discloses an energy-saving urea production system, a carbon dioxide stripping tower and a high-pressure ammonia ejector are connected with a first high-pressure methylamine condenser, a second high-pressure methylamine condenser is connected between the first high-pressure methylamine condenser and a urea synthesis tower, the second high-pressure methylamine condenser can be connected with a carbon dioxide compressor, and the urea synthesis tower is connected with the upper portion of the carbon dioxide stripping tower to input urea mixture into the carbon dioxide stripping tower. The energy-saving urea production system improves the recovery rate and utilization rate of the synthesis reaction heat through the addition of the second high-pressure methylamine condenser.

The utility model relates to the technical field of multi-stage pumps, in particular to a single-flow-channel type inner shell structure applied to a hydrogenation feeding pump and an ammonium carbamate pump in the petrochemical industry. One end of a long transition flow channel suction chamber is connected with a short transition flow channel at the tail of a pump driving end, and the other end of the long transition flow channel suction chamber is connected with one end of a long transition flow channel; the other end of the long transition runner is connected with the first short transition runner at the non-driving end of the pump; and the first short transition runner at the non-driving end of the pump is connected with the delivery chamber to jointly form an inner shell runner. The short transition flow channels are arranged on the single side of the driving end or the non-driving end of the pump in a staggered mode step by step. According to the technical scheme, the problems that the manufacturing difficulty and cost of a grinding tool are increased due to a double-flow-channel structure in the prior art are solved; the small runner size is easy to generate casting defects, and the yield is low; and the pump efficiency is low.

The invention relates to a preparation method and application of a pyrazole amide compound containing a chloropyridine methoxy aryl structure. The pyrazolic acid derivative is obtained by condensing chloropyridine methoxy aryl methylamine and pyrazolic acid. The pyrazole amide compound containing the chloropyridine methoxy aryl structure has a good insecticidal effect on harmful insects, and can be used for preparing insecticides in the fields of agriculture, horticulture and the like.

This invention relates to the field of polymer materials technology, and discloses a lignin-based adsorbent modified with a methylamine oxime, its preparation method, and its application. The invention uses lignin enzymatically hydrolyzed solid waste from industrial ethanol production as raw material. Utilizing the phenolic hydroxyl activity of lignin, methylamine oxime functional groups are chemically grafted onto the lignin structure to obtain a lignin-based adsorbent modified with a methylamine oxime. This adsorbent has the advantages of strong stability, high adsorption activity, low cost, and recyclability, enabling the high-value utilization of waste enzymatically hydrolyzed lignin. When the above-mentioned lignin-based adsorbent is used in the treatment of highly acidic uranium-containing nuclear wastewater, the uranium adsorption rate can reach up to 99.9%, which is beneficial for the promotion of lignin-based materials in the industrial application of treating highly acidic nuclear wastewater.

The utility model discloses a tail gas absorption tower, which relates to the technical field of tail gas treatment and comprises an absorption tower body, a gas outlet and a gas inlet, the gas outlet and the gas inlet are respectively positioned at the upper end and the lower end of the absorption tower body, and a water washing unit, a methanol washing unit and a dust removal unit are sequentially arranged in the absorption tower body from top to bottom. The dust removal bag is used for separating the filter chamber from the methanol washing unit; and the air inlet is communicated with the filter chamber. According to the utility model, alcohol washing and water washing are integrated in one absorption tower, so that methanol, ammonia, monomethylamine, dimethylamine, trimethylamine and the like generated in the methylamine production process are absorbed, the occupied area of the absorption tower can be reduced, and the tail gas treatment efficiency of the absorption tower is improved.

The invention provides a siloxane primer for bonding rubber and metal for a cable joint as well as a preparation method and application of the siloxane primer. The siloxane primer is prepared from the following components in parts by weight: 10 to 16 parts of trimethoxy silane containing epoxy alkyl, 10 to 16 parts of trimethoxy silane containing aminoalkyl, 3 to 6 parts of a methylamine auxiliary agent, 3 to 8 parts of a phenol auxiliary agent, 3 to 6 parts of a stabilizer and 50 to 65 parts of an organic solvent. Trimethoxysilane containing epoxy alkyl in the primer forms a covalent bond with the metal surface through the epoxy alkyl, and forms a good bonding interface with silicon rubber at the silane group end. Trimethoxy silane containing aminoalkyl is subjected to chemical reaction with hydroxyl or other polar groups on the surface of metal through aminoalkyl, so that the adhesive force of the primer and the metal is enhanced. Therefore, the siloxane primer disclosed by the invention can be used for improving the bonding strength between the silicone rubber and the metal, so that the reliability of a cable joint is improved.

The invention relates to a system and a process for recovering gas phase condensation heat at the top of a desorption tower of a urea device. The system comprises a vacuum stripping preconcentrator, a reflux condenser, a vacuum preconcentrator, a medium-pressure methylamine condenser and a liquid ammonia preheater. A urea solution is subjected to first evaporation and concentration in a vacuum stripping preconcentrator, and a gas phase at the top of a desorption tower enters a reflux condenser to be completely condensed after being incompletely condensed in a shell pass; the concentrated urea solution enters a vacuum pre-concentrator for secondary evaporation and concentration, and the gas phase at the top of the medium-pressure decomposition tower and the methylamine solution at the outlet of the medium-pressure methylamine pump enter a medium-pressure methylamine condenser for further condensation after being incompletely condensed in a shell pass. The heat of the intermediate water is used for preheating liquid ammonia and refrigerating a lithium bromide unit, and the produced low-temperature water is supplied to a second-stage evaporative condenser of a urea granulation device. Through reasonable connection and process design, efficient recovery and utilization of low-grade heat energy are achieved, accurate control over the intermediate water flow is achieved, and it is ensured that all equipment operates under the optimal working condition.

The invention provides a low-energy-consumption urea production process by a CO2 stripping method. A related process device comprises a high-pressure system, a medium-pressure system, a low-pressure system, a micro-positive-pressure system, a vacuum concentration system, an ammonia and carbon dioxide recovery system and the like. Wherein the high-pressure system consists of a urea synthesis tower, a high-pressure washing condensation reactor and a high-pressure COstripping tower; the high-pressure washing and condensing reactor has three functions of condensing high-pressure ammonium carbamate liquid, dehydrating ammonium carbamate to generate urea, and washing ammonia gas and carbon dioxide gas. Decomposition of ammonium carbamate in the urea solution is completed through a heating decomposition process of the medium-pressure decomposition tower and the low-pressure decomposition tower; the moisture of the urea solution is evaporated by adopting processes such as micro-positive pressure flash evaporation, pre-concentration evaporation, concentration evaporation and the like. In the recovery system, processes such as micro-positive pressure flash evaporation condensation absorption, low-pressure washing absorption, low-pressure methylamine condensation absorption, medium-pressure methylamine condensation absorption, medium-pressure washing absorption and high-pressure washing absorption are used for effectively recovering ammonia and carbon dioxide.

The utility model relates to the technical field of variable-frequency regulation and control equipment, and discloses variable-frequency regulation and control equipment for monomethylamine absorption circulation flow velocity, which comprises a monomethylamine removal kettle. According to the variable-frequency regulation and control equipment for the monomethylamine absorption circulation flow velocity, through the arrangement of the detection and adjustment assembly, when the variable-frequency regulation and control equipment is used, a water jet vacuum pump set is additionally arranged on a monomethylamine absorption circulation pipeline, gas is pumped out according to the principle that static pressure energy and dynamic pressure energy are mutually converted when fluid flows, and the vacuum degree in a monomethylamine removal kettle is maintained; a frequency converter is introduced between a circulating pump and a vacuum pump, a vacuum degree sensor is arranged in a monomethylamine removal kettle, the vacuum degree in the kettle is monitored in real time, a signal is fed back to the frequency converter, and a closed-loop control system is formed; according to a feedback signal of the vacuum degree sensor, the frequency converter automatically adjusts the rotating speed of the circulating pump, so that the flow rate and the vacuum degree of the circulating liquid are maintained in the set optimal state, and the absorption effect and the production efficiency are improved.

The present application relates to an environment-friendly water-based industrial anticorrosive coating and a preparation method thereof, and belongs to the technical field of coating. The coating composition comprises chloroether resin emulsion, corrosion inhibition emulsion, barrier agent, slag composite filler, etc. The corrosion inhibition emulsion is prepared by using hexamethylcyclotrisilazane, glycidyl furfuryl ether and 2-furfurylamine in isopropyl alcohol as raw materials and tetramethylammonium hydroxide as catalyst, and then emulsified with deionized water and composite emulsifier after removing isopropyl alcohol. The barrier agent is prepared by modifying the titanium aluminum carbide sheet layer after acid stripping with 3-aminopropyltriethoxysilane. The slag composite filler is prepared by sintering blast furnace slag powder, zeolite powder and potassium dihydrogen phosphate, etching with citric acid, and then modifying with boron nitride and KH-172 silane coupling agent. The coating uses water as the dispersion medium to reduce VOC emissions, and constructs a protective system in multiple dimensions through chemical active corrosion protection, physical layered barrier, dense film formation and interface covalent bonding, and is suitable for harsh corrosion scenes such as industrial heavy-duty corrosion, ships and marine engineering.

The invention provides a preparation method of fluoromethylamine naphthyl propanol. Specifically, the method comprises the following steps: reacting a compound V with a compound VI in an inert solvent in the presence of alkali to obtain a compound VII; and then optionally carrying out salt forming reaction on the fluoromethylamine naphthyl propanol and acid to obtain the salt of the fluoromethylamine naphthyl propanol. The invention provides a new synthetic route of fluoromethylamine naphthyl propanol, and the method can simplify the operation process, avoid the use of reagents with safety risks, reduce the generation of impurities, reduce the post-treatment difficulty and significantly improve the yield, and is very suitable for industrial production.

The invention discloses a preparation method and application of a high-strength non-isocyanate polyurethane coating film, and belongs to the technical field of high-molecular polyurethane materials.Fluorine-containing monohydric alcohol, perfluoroalkyl methylamine and epoxy resin are introduced into a non-isocyanate polyurethane system in a synergistic mode, and the high-strength non-isocyanate polyurethane coating film is obtained after specific process reaction and curing. The coating film with a multi-stage composite structure is prepared. The obtained coating film has high strength, the pencil hardness reaches 4H-5H, the highest adhesion grade is 0 grade, the impact resistance reaches up to 80cm, the stress strength is between 21.32 MPa and 24.63 MPa, the strain reaches 5.43-6.04 times, the wear resistance is excellent, the mass loss is as low as 3.08-3.56 mg, the mechanical strength, water resistance, heat resistance and salt fog resistance of the coating film are jointly improved, and the coating film has good application prospects. And the harsh requirements of high-strength application scenes such as surface coating of train carriages and containers can be met.

To provide a method for preparing new stable liquid, non-particulate formulations of metal ions which are easy to incorporate into or apply onto materials and can achieve sustained antimicrobial efficacy.SOLUTION: There is provided a preparation method, wherein a solution comprising a) a soluble metal salt, b) a nitrogen-containing base selected from the group consisting of methylamine, monoethanolamine, ammonium hydroxide, and mixtures thereof, and c) water is mixed with a polymer containing a metal ion ligand selected from the group consisting of vinylimidazole and vinylpyridine as polymerized units to form a mixture without precipitation, and wherein the metal is silver.SELECTED DRAWING: None

The invention relates to a method and system for continuously preparing sodium sarcosinate, and the method comprises the following steps: preparing an amine alkali solution; adding a chloroacetic acid aqueous solution and mixing with the prepared amine alkali solution; monitoring the adding proportion of the chloroacetic acid and the amine alkali, collecting a reaction solution of the chloroacetic acid aqueous solution and the amine alkali solution after a certain threshold value is reached, and taking at least part of the collected reaction solution as a circulating solution; wherein the amine-alkali solution is continuously added into the circulating liquid, the mixed circulating liquid is returned, the circulating liquid and the chloroacetic acid aqueous solution are mixed in a spraying mode and react, when discharging is needed, discharging liquid is collected, the alkali metal solution is added into the discharging liquid, methylamine in the discharging liquid is recycled, solid-liquid separation is conducted on the discharging liquid, and the methylamine-alkali mixed circulating liquid is obtained. Sodium chloride salt and a sodium sarcosinate solution are obtained; and in the production process, the circulating liquid is continuously recycled. According to the method, the content of byproducts such as MIDA in the product is effectively reduced, the yield of sodium sarcosinate is improved, and the production cost is reduced.

The application discloses a nitrogen-doped porous carbon loaded monatomic catalyst and a preparation method and application thereof, wherein dimethyl imidazole and zinc nitrate hexahydrate are used as solutes, anhydrous methanol is used as a solvent, and ZIF 8 is formed by stirring at normal temperature; phen (phenanthroline), dopamine (DA), a transition metal source (M) and trimethylolamine are added into the ZIF 8 to form a precursor ZIF8@MPhenPDA; the ZIF-8@M-PhenPDA precursor is subjected to gradient temperature control pyrolysis in a protective gas atmosphere, and the monatomic catalyst is obtained after cooling. The raw material cost is low, the preparation process is simple, the monatomic catalyst can be prepared in a large amount, is suitable for large-scale synthesis of the monatomic catalyst, has universal applicability, and solves the problems of complexity in the prior art and difficulty in large-scale preparation.

The application belongs to the technical field of pharmaceutical analysis, and particularly relates to a detection method of ammonia in methamphetamine, which is a convenient, efficient and accurate detection method for solving the problem of ammonia detection in methamphetamine. The method uses gas chromatography to detect the content of ammonia in methamphetamine, has low detection cost, and is convenient for quality control of methamphetamine. The method is convenient, efficient and accurate, and fully meets the guiding principles of method verification of Chinese Pharmacopoeia in terms of system applicability, repeatability, specificity and accuracy, and can be used for quality control of methamphetamine.

The invention belongs to the technical field of environmental microorganisms, and particularly relates to a metolachlor anaerobic degradation strain SRB-9 and application thereof. According to the present invention, a strain SRB-9 capable of efficiently and anaerobically degrading metolachlor (MET) is separated from anaerobic sediments, and the morphological and molecular biological identification results show that the strain belongs to nitrate desulfurization vibrio, is named as Nitatidesulfurvibrio sp. SRB-9, is preserved in the China Center for Type Culture Collection (CCTCC), and has a preservation number of CCTCC M 20251781. The invention further provides a preparation method of the metolachlor-metolachlor anaerobic degradation strain SRB-9, and the metolachlor-metolachlor anaerobic degradation strain SRB-9 can be used for efficiently and anaerobically degrading metolachlor-metolachlor anaerobic degradation strain SRB-9, the bacterial strain can rapidly degrade MET under anaerobic conditions, and the degradation half-life period of the bacterial strain to MET with the concentration of 100 [mu] M is 9.6 d. And the strain can also be used for rapidly and anaerobically degrading five kinds of chloroacetamide herbicides such as alachlor, acetochlor, propisochlor, pretilachlor and butachlor. The strain disclosed by the invention is beneficial to repairing wastewater or soil polluted by various chloroacetamide herbicides, enriches a resource library of pesticide degrading bacteria, and has a good application prospect.

The invention provides a composite adsorbent and a preparation method and application thereof.The composite adsorbent comprises an activated carbon carrier, a metal organic framework layer and ionic liquid, the metal organic framework layer is loaded on the surface and in pore channels of the activated carbon carrier, and at least part of the ionic liquid is loaded in pore channels of the metal organic framework layer; the ionic liquid comprises basic ionic liquid and neutral ionic liquid. The composite adsorbent can efficiently adsorb methylamine gas, and the desorption regeneration energy consumption of the composite adsorbent is low.

The invention provides a herbicide alachlor specific artificial antigen and a preparation method and application thereof, and belongs to the technical field of pesticide residue detection. The preparation method comprises the following steps: (1) dissolving alachlor and an alkali reagent in an organic solvent, adding 3-mercaptopropionic acid as a derivative agent, and reacting to obtain alachlor hapten; and (2) dissolving the alachlor hapten in a polar solvent, adding an activator for activation, and then dropwise adding the activated hapten solution into a carrier protein solution for coupling to obtain the alachlor specific artificial antigen. The hapten is synthesized by adopting a one-step method, the steps are simplified, the post-treatment is simple, the yield can reach more than 80%, and the hapten retains characteristic functional groups of alachlor and has strong immunogenicity after being coupled with carrier protein. The alachlor monoclonal antibody prepared from the artificial antigen is good in specificity and low in cross reaction rate, the IC50 value is 5 ng / mL, and alachlor residues in food and environmental water samples can be rapidly detected.

The invention discloses a perovskite material for improving water stability based on bidentate ligand covalent passivation and a preparation method and application thereof. The preparation method comprises the following steps: introducing a bidentate ligand of mercaptocarboxylic acid (2-11 carbons, such as mercaptoacetic acid (TGA), mercaptopropionic acid (MPA), mercaptobutyric acid (MBA), mercaptovaleric acid (MAA), mercaptohexanoic acid (MHA) and the like) into a lead iodide methyl ammonium (MAPbI3) perovskite crystal lattice, and forming a stable Pb-S covalent bond by utilizing mercapto (-SH) and Pb < 2 + >; meanwhile, carboxyl (-COOH) and methylamine ions (MA < + >) in mercaptocarboxylic acid are catalyzed through 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS) to form amido bonds, synchronous double-site covalent passivation of perovskite crystal lattices is achieved, and the water-stable mercaptocarboxylic acid-MAPbI3 perovskite material is formed. According to the method, decomposition of MAPbI3 in a water environment is effectively inhibited, and the water stability and the photoelectric property of the material are remarkably improved. The bidentate ligand synchronous covalent bond passivation method provided by the invention provides a new thought for improving the water stability and the photoelectric property of the perovskite material, and the prepared material has a wide application prospect in photoelectric devices such as solar cells, optical detectors and photoelectrochemical sensors, and is particularly suitable for long-term stable work in a high-humidity environment.

The invention discloses an anti-static spinning yarn and a preparation method thereof, and relates to the technical field of textile materials. When the anti-static spinning yarn is prepared, firstly, itaconic anhydride and tetrahydrofuran are subjected to ring opening alternate polymerization, then bromination and N, N-dimethylthiophene-2-methylamine quaternization modification are sequentially carried out, and quaternized polyester is prepared; carrying out melt spinning on quaternized polyester to form fibers, and carrying out wet stretching to obtain matrix fibers; then 3, 4-ethylenedioxythiophene is polymerized on the surface of the fiber to generate a polymer conducting layer, the polymer conducting layer is twisted into yarn, ion binding is conducted through anion phytic acid solution treatment, and finally the anti-static spinning yarn is obtained through sodium bicarbonate solution neutralization and water washing. The anti-static spinning yarn prepared by the method has excellent anti-static property, antibacterial property and flame retardant property.

The present application relates to a kind of high concentration DMF waste water biological treatment method, belong to wastewater treatment technical field;Including: mixed strain screening, activation and scale-up culture are carried out;And join DMF waste water;In fermentation treatment, the growth of microorganism and the change situation of COD are monitored regularly, when microorganism growth is in logarithmic phase, extract microbial genomic DNA, high-throughput sequencing is carried out to microorganism in fermentation waste water, determine the proportion of final fermentation waste water and dominant genus;When mixed strain processing efficiency reduces in fermentation process, add certain genus according to genus proportion to make its proportion consistent, and add carbon source and growth factor;Compared with single bacteria degradation DMF, the mixed strain selected by the present application converts DMF in waste water into dimethylamine and methylamine by the process of mixed strain biological fermentation, and is finally converted into ammonia and carbon dioxide, and the biochemical property can be increased by 2-5 times, to reduce the load of subsequent conventional sludge system.

The utility model relates to a urea production system. The system comprises a urea synthesis tower, a gas phase outlet of the urea synthesis tower is connected with the lower part of a stripping tower, a gas-liquid mixture outlet of the urea synthesis tower is connected with the upper part of the stripping tower, and a liquid phase outlet of the stripping tower is connected with a middle-high pressure decomposition unit capable of exchanging heat for first-section evaporated urea melt liquid through a pressure reducing valve; the middle-high pressure decomposition unit is respectively connected with the middle-high pressure decomposition unit and the middle-high pressure methylamine recovery unit; the system has the characteristics of reducing operation difficulty, reducing ammonia loss and realizing full utilization of heat energy on the basis of realizing stable operation of the system.

The application discloses a narrow-band photodetector based on a bromine lead cesium / methylamine lead bromide single crystal heterojunction and a preparation method thereof, and realizes light detection through a heterojunction formed by a CsPbBr3 single crystal and a MAPbBr3 single crystal. The photodetector has the advantages of narrow detection waveband range and high selectivity.

The utility model discloses a high-pressure ammonium carbamate centrifugal pump which comprises a base, a driving motor is fixedly installed at the top of one end of the base, a pump body is fixedly installed at the other end of the base, a pump shaft is installed in the middle of the pump body, and the output end of the driving motor is connected with the end of the pump shaft through a coupler. The pump shaft is driven to rotate through operation of the gear driving assembly so as to achieve operation of the pump body, or the pump shaft is driven to rotate through operation of the belt driving assembly so as to achieve operation of the pump body, operation of the pump body can be achieved by selectively using the gear driving assembly or the belt driving assembly, the pump body can be continuously operated, and meanwhile the pump body can be continuously operated. The pump body is controlled through operation of the gear driving assembly or the belt driving assembly, the reliability of controlling operation of the pump body is ensured, vibration and noise generated when the second motor or the first motor operates on the mounting plate are reduced through the noise reduction rubber pad at the bottom of the mounting plate, and noise pollution is reduced.

The invention relates to the technical field of urea production, in particular to an efficient differential pressure thermal cycle urea production device and method.The efficient differential pressure thermal cycle urea production device comprises a compressor, a synthesis tower, a sub-high-pressure decomposer, a front reaction unit and a medium-pressure pretreatment unit, and a first material conveying pipeline is communicated between an outlet of the synthesis tower and an inlet in the bottom of the sub-high-pressure decomposer; a second material conveying pipeline is communicated between an outlet of the sub-high-pressure decomposer and an inlet of the medium-pressure pretreatment unit, a third material conveying pipeline is communicated between the outlet of the sub-high-pressure decomposer and an inlet of the front reaction unit, and a first outlet and a second outlet of the front reaction unit are fixedly communicated with the bottom of the medium-pressure pretreatment unit and the bottom of the synthesis tower respectively; in the latter, a urea mixed solution at an outlet of a synthesis tower is decomposed in advance, the steam usage amount of urea medium and low pressure decomposition systems and the usage amount of circulating water of medium and low pressure absorption systems are reduced, a first gas-phase mixture reacts with tail liquid from a melamine device, a medium-pressure methylamine solution and CO2 in advance, and the load of a compressor is reduced.

The application provides a synthesis method of tolfenpyrad, and belongs to the technical field of medicine synthesis. Methylamine aqueous solution is used for synthesizing methylaminoformic acid ethyl ester with diethyl carbonate. N-[3-methyl-4-(4-trifluoromethylsulfanyl-phenoxy)-phenyl]-urea (arylurea) is used as a starting material to react with the obtained methylaminoformic acid ethyl ester under the action of a catalyst to synthesize biuret. The biuret is subjected to ring closing with diethyl carbonate to generate tolfenpyrad. The synthesis method does not need to use phosgene, is simple to operate, raw materials are easy to obtain, cost is low, and the yield is high.

The invention discloses a heat recovery device and cleaning equipment thereof, and relates to the technical field of energy conservation and environmental protection, the heat recovery device comprises a base frame, a storage barrel is fixed to the upper end face of the base frame, a first water inlet pipe is communicated with the upper end of the storage barrel and close to the edge, and a first water drainage pipe is communicated with the lower end of the storage barrel and close to the edge; the first drainage pipe penetrates through the base frame, a first drainage valve is arranged on the first drainage pipe, a middle thick pipe is arranged in the storage barrel, the two ends of the middle thick pipe are fixedly connected with the inner top and the inner bottom of the storage barrel respectively, and a second water inlet pipe communicated with the middle thick pipe is fixedly arranged on the upper end face of the storage barrel. A second drainage pipe communicated with the middle thick pipe is fixedly arranged on the lower end face of the storage cylinder, penetrates through the base frame and is provided with a second drainage valve. When the device is used, part of heat in wastewater generated in methylamine rectification production can be recycled, and waste of resources is reduced.

The application discloses a horizontal high-pressure methylamine full-condensation reactor and a CO2 gas stripping method urea production system. The application adopts a special horizontal high-pressure methylamine condensation reactor and a unique urea high-pressure ring process flow, realizes that the two-step reactions of urea are carried out under the best conditions, and solves the problems of low conversion rate, low by-product steam pressure, high energy consumption and high civil framework of the traditional CO2 gas stripping method urea process. The application has the advantages of simple process, high conversion rate, low energy consumption and low framework.

The invention discloses a preparation method of bio-based 1, 2-pentamethylene diamine, and belongs to the technical field of fine chemical engineering. According to the method, a biological furfural derivative 2-furanmethylamine is taken as a raw material, and the 1, 2-pentanediamine is obtained through a reaction under the conditions that an ammonia source and a supported metal catalyst exist and the hydrogen pressure is 0.5-8 MPa and the temperature is 120-200 DEG C. The supported metal catalyst is prepared from one or more active metals selected from Rh, Co, Pt, Ni, Ru and the like and carriers such as TiO2, gamma-Al2O3, ZrO2, attapulgite and the like through an impregnation method, and the total loading amount of the active metals is 2-30 wt%. According to the method, the high-added-value 1, 2-pentanediamine is prepared from the biomass-based raw material, the reaction conditions are mild, the conversion rate of the 2-furanmethylamine can reach 100%, and the highest yield of the 1, 2-pentanediamine is 55.6%; the preparation method of the catalyst is simple, the catalyst can be repeatedly used, and an efficient new path is provided for large-scale preparation of 1, 2-pentanediamine.