1394 results about "Catalytic hydrogenation" patented technology

The embodiment of the invention relates to a modular integrated photocatalytic hydrogen production system and a photocatalytic hydrogen production method thereof, and belongs to the technical field of new energy photocatalytic hydrogen production. The modularized integrated photocatalytic hydrogen production system comprises an integrated rack, a plurality of photocatalytic hydrogen production reaction devices are arranged in the integrated rack, and the photocatalytic hydrogen production reaction devices are connected with a monitoring control device. The modularized integrated photocatalytic hydrogen production system provided by the embodiment of the invention not only integrates the photocatalytic hydrogen production reactor, efficient utilization of light emitted by the light source and timely recycling of volatile reaction liquid, but also adopts a modularized structure to integrate a plurality of photocatalytic hydrogen production reaction devices, pipelines thereof and a control system; the whole device is simple in structure, convenient to machine, convenient to use and beneficial to equipment management and maintenance, the hydrogen production scale can be conveniently expanded according to needs, and application and popularization of the photocatalytic hydrogen production technology are facilitated.

The invention relates to Omarlliptin, in particular to a novel method for preparing Istradafylline, and relates to a preparation method of Istradafylline, in particular to a preparation method of Istradafylline. The method comprises the following steps: carrying out coupling reaction on a compound Ia and TMS acetylene to obtain an intermediate Ib; carrying out bromination reaction on the intermediate Ic under the action of NBS (N-bromosuccinimide) to obtain an intermediate Id; carrying out substitution reaction on the intermediate Id and tert-butyl carbamate under the action of potassium tert-butoxide to obtain an intermediate Ie; reacting the intermediate Ie with paraformaldehyde to obtain an intermediate If; carrying out cycloaddition reaction on the intermediate If and the intermediate Ib to obtain a key intermediate Ig; carrying out asymmetric catalytic hydrogenation reduction on the intermediate Ig to obtain an intermediate Ih; and removing a protecting group from the intermediate Ih in a hydrochloric acid and ethyl acetate system to obtain a final product. The method is short in route, simple and convenient to operate, mild in condition, high in reaction yield, environment-friendly and easy for industrial production, and dangerous and highly toxic products are prevented from being used and hazardous chemicals are supervised. # imgabs0 #

Disclosed in the present invention are a surface-confined atomically dispersed Pt@SiO2-N catalyst, a preparation method therefor and a use thereof. According to the present invention, on the basis of an atomic layer deposition (ALD) technology, it is reported for the first time that, by using amino-functionalized grafted porous SiO2 flower-like nanospheres as a carrier, a surface-confined atomically dispersed Pt@SiO2-N catalyst is prepared by regulating ALD deposition parameters. The size of Pt metal is precisely regulated from single atoms, clusters to nanoparticles. The single-atom and cluster coexisting catalyst shows excellent catalytic hydrogenation activity and selectivity for p-chloronitrobenzene. According to the catalyst of the present invention, the defect of a traditional SiO2 supported catalyst that is prone to agglomeration is greatly ameliorated, the utilization rate and stability of metal atoms are greatly improved, and this synthesis strategy can be popularized to preparation of other heterogeneous catalysts.

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 discloses a method for joint production of cyclohexylamine and dicyclohexylamine, which comprises the following steps: 1) feeding aniline tail gas of a nitrobenzene catalytic hydrogenation production device into a gas-liquid separator for gas-liquid separation to obtain aniline tail hydrogen and aniline condensate; 2) mixing aniline tail hydrogen and new hydrogen as a raw material A, and mixing defective aniline and fresh aniline in proportion as a raw material B; (3) feeding the vaporized raw material B and the vaporized raw material A into a fixed bed reactor according to a certain hydrogen-oil ratio, and carrying out hydrogenation reaction; a hydrogenation reaction product is subjected to heat exchange condensation and then enters a gas-liquid separator for gas-liquid separation, a gas phase serves as recycle hydrogen to be mixed with the raw material A, and a liquid phase is fed into a distillation device; and 4) carrying out primary distillation and rectification purification in sequence to obtain cyclohexylamine and dicyclohexylamine. According to the method, aniline tail gas resources and defective aniline are fully utilized, the three-waste treatment cost is reduced, product benefits can be improved, pollution to the environment can be reduced, and economic benefits and social benefits are remarkable.

The invention relates to a method for synthesizing 2-methyltetrahydrofuran, in particular to a method for synthesizing 2-methyltetrahydrofuran by using a nickel / aluminum oxide catalyst, which comprises the following steps: weighing Ni salt and Al salt, and adding deionized water to prepare a metal salt solution; mixing the salt solution and the alkaline solution, adding the mixture into a beaker containing distilled water in a parallel flow manner, and controlling the pH value to be 6-8; stirring and aging at 40 DEG C for 4 hours; the Ni / Al2O3 catalyst is obtained; the Ni / Al2O3 catalyst is applied to a 2-MF gas phase hydrogenation reaction, H2 / N2 mixed gas is used for reduction, the catalyst after reduction starts to react, the initial H2 / 2-MF ratio is 0.2-1, after feeding reaction is performed for 10-30 hours, then the H2 / 2-MF ratio is increased to 4-10, and gas phase catalytic hydrogenation reaction is performed. The mild gas-phase hydrogenation reaction conditions are adopted, and the catalyst is high in activity, high in selectivity and good in stability. The catalyst is low in cost, resources are saved, and the gas phase hydrogenation process is high in safety, so that better economic benefits are achieved.

The invention relates to an iron-based catalyst for catalyzing CO2 hydrogenation to prepare low-carbon olefin and a preparation method thereof, and the preparation method comprises the following steps: preparing a zirconium oxide carrier, grinding ZrOCl2. 8H2O, calcining in a muffle furnace to obtain ZrO2, and grinding to obtain the zirconium oxide carrier; the preparation method comprises the following steps: respectively dissolving a Fe source, a Co source and a K source in water, adding the zirconia carrier, stirring and evaporating to obtain a suspension, drying the suspension, and calcining to obtain a FeCoK / ZrO2 catalyst; wherein in the FeCoK / ZrO2 catalyst, the loading capacity of Fe-Co is 12.2 wt%, the molar ratio of Co / (Fe + Co) is 0.15 to 2, and the molar ratio of K to Fe is 0.2 to 0.7. The FeCoK / ZrO2 catalyst prepared by the preparation method disclosed by the invention has a very high conversion rate on CO2 and selectivity on low-carbon olefins, optimizes the adsorption activation path on CO2, and has very good catalytic activity.

The invention belongs to the technical field of methane catalytic cracking hydrogen production, and particularly relates to a catalyst continuous cyclic regeneration methane catalytic cracking hydrogen production device and a hydrogen production system. The hydrogen production device comprises a methane catalytic cracking reactor, a steam reforming regeneration reactor and a spiral conveyor, and the bottom of the methane catalytic cracking reactor is communicated with the steam reforming regeneration reactor through the spiral conveyor. A steam distributor is arranged in the steam reforming regeneration reactor, and the top of the steam reforming regeneration reactor is communicated with the top of the methane catalytic cracking reactor. Along with the catalytic cracking reaction, the deactivated catalyst settles to the bottom of the methane catalytic cracking reactor and is conveyed to the steam reforming regeneration reactor by the spiral conveyor, and steam upwards blown by the steam distributor is in contact with the deactivated catalyst, is regenerated and enters the catalytic cracking reactor again; a continuous cycle process of catalysis, inactivation, regeneration and catalysis is completed; the deactivated catalyst is regenerated through water vapor, so that potential safety hazards caused by oxygen entering are avoided.

The invention provides a Pd-M1-M2-Sn entropy intermetallic compound catalyst as well as a preparation method and application thereof, active metal components M1 and M2 in the catalyst are respectively selected from one of Fe, Co and Cu, and M1 is different from M2; according to the catalyst, a Pd-M1-M2-Sn multi-tooth rhombic active site is jointly formed by four kinds of metal, and a Pd-M1-M2-Sn quadruple site structure formed by M1, M2 and Sn which are deficient in electrons and Pd which is isolated and rich in electrons is formed. When the catalyst is applied to preparation of methanol through catalytic hydrogenation of carbon dioxide, the CO2 conversion rate, the methanol selectivity and the methanol yield can be remarkably improved, and the catalyst keeps good stability in a long-time reaction and has a wide industrial application prospect.

The invention discloses a method for electro-catalytic hydrogenation of lignin by using a Bi-(Et3N) catalyst, and belongs to the technical field of electro-catalytic hydrogenation of lignin. The method comprises the following steps: adding a Bi-(Et3N) catalyst and a lignin model compound into an H-shaped electrolytic cell, and carrying out electro-catalytic hydrogenation on the model compound under a constant current system. In the preparation process of the catalyst, the coordination environment of Bi < 3 + > species is changed by adjusting the use amount of triethylamine, so that controllable transformation between Bi (OH) 3 and Bi-(N-C) coordination structures is realized, a large number of lattice defects are further derived, the generation of the Bi-(N-C) structures induces the appearance of electron-deficient Bi species, and the yield of the catalyst is improved. The electrochemical hydrogenation catalyst shows excellent performance in electrochemical hydrogenation of lignin model compounds.

The invention relates to a preparation method of H12MDA with low trans-trans isomer content and a catalyst used in the preparation method. The catalyst is a supported catalyst and comprises a silicon-aluminum amorphous carrier and an active component, the silicon-aluminum amorphous carrier has a micropore, mesopore and macropore structure and is prepared by carrying out hydrothermal reaction on raw materials comprising an aluminum source and a silicon source in the presence of a template agent, and the template agent is selected from 4, 4-diaminodiphenyl-methane and 2, 4-diaminodiphenyl-methane or 2, 4-diaminodiphenyl-methane or 2, 4-diaminodiphenyl-methane or 2, 4-diaminodiphenyl-methane or 2, 4-diaminodiphenyl-methane or 2, 4-diaminodiphenyl-methane or 2, 4-diaminodiphenyl-methane. The catalyst is one or a combination of two of 1, 4-diaminodiphenylmethane. The catalyst is long in service life and excellent in stability, the yield of an H12MDA target product can be increased, the content of trans-isomers in the product is reduced, and the preparation process is also simple. The invention also provides a method for preparing H12MDA through MDA catalytic hydrogenation, and the method can improve the yield of the H12MDA product and obviously reduce the content of trans-isomers in the product.

The invention provides a plasma coupling thermocatalysis biomass gas phase on-line hydrogenation system and method.The plasma coupling thermocatalysis biomass gas phase on-line hydrogenation system mainly comprises a pyrolysis reaction system, an on-line hydrogenation system and a condensation system.The pyrolysis reaction system comprises a pyrolysis reactor and a pyrolysis gas outlet formed in the pyrolysis reactor; the pyrolysis reactor is used for carrying out pyrolysis reaction on biomass to generate pyrolytic carbon and pyrolysis gas, the pyrolysis gas is discharged through a pyrolysis gas outlet, the online hydrogenation system comprises a hydrogenation reactor, the hydrogenation reactor carries out online catalytic hydrogenation on the pyrolysis gas through hydrogen plasma and a catalyst to generate a hydrogenation product, and the condensation system comprises a condensation tank. And the condensation tank is used for condensing the hydrogenation product to obtain a condensed liquid product and non-condensed gas. According to the process, gas-phase online hydrogenation upgrading can be achieved, the active hydrogen plasma and the gas-phase pyrolysis product are subjected to the catalytic hydrogenation reaction at normal pressure, and compared with a traditional process, the process is small in overall loss and low in energy consumption, and operation is safer and more stable at normal pressure.

The invention belongs to the technical field of petroleum processing, and particularly relates to a catalyst and a preparation method and application thereof. The raw materials of the catalyst comprise a metal active component, a carrier and an auxiliary agent, the metal active component is sulfides of Mo and Ni elements, the carrier is spherical gamma-Al2O3 of 0.5-1 mm, and the auxiliary agent is P; the carrier is modified by using the metal active component and the auxiliary agent to serve as the catalyst. The high-activity catalyst is synthesized by adopting the strategy of changing the roasting temperature, adding the additive for doping modification and changing the molar ratio of metal active components, the additive is combined with surface aluminum atoms, the framework strength is enhanced, pore channel collapse caused by acid / water erosion is reduced, the water resistance and acid resistance of the catalyst are improved, and the catalytic reaction activity is further improved. The catalyst disclosed by the invention is accurate and controllable in structure, can be synthesized in batches, and can be applied to the co-catalytic hydrogenation process of biomass pyrolytic oil and / or a model compound thereof and petroleum distillate oil and / or VR.

The invention relates to the field of chemical engineering, in particular to an n-hexane separation technology, and more particularly relates to a method and a device for preparing electronic-grade n-hexane. The method for preparing the electron n-hexane comprises the following steps: S1, introducing an adsorbent into an n-hexane raw material to remove moisture in the n-hexane, and then carrying out catalytic hydrogenation reaction to obtain crude n-hexane; and S2, carrying out primary filtration on the material subjected to catalytic hydrogenation, then carrying out light component removal and heavy component removal two-stage rectification to obtain high-purity n-hexane, and carrying out secondary filtration on the high-purity n-hexane to obtain the electronic-grade n-hexane. The device for preparing the electronic-grade n-hexane comprises a raw material tank, an adsorption tower, a catalytic hydrogenation reactor, an intermediate tank, a light component removal tower, a heavy component removal tower and a product tank which are connected in sequence. According to the preparation method and device, high-purity electronic-grade n-hexane meeting the strict requirements of the semiconductor industry can be produced, the process steps are simple, industrial production is easy to achieve, the product quality is stable and reliable, and high economic and social benefits are achieved.

The invention discloses a method and a device for preparing CLT acid through pipeline type continuous catalytic hydrogenation reduction. According to the method, catalytic hydrogenation reduction reaction is carried out in the device. According to the method, equipment such as a five-stage static tubular mixer, a gas-liquid separation tank and a reduction liquid temporary storage tank is adopted, so that efficient hydrogenation reduction of the CLT acid nitride is realized. In the reaction process, hydrogen is proportionally introduced by stages through a grading mixer, the hydrogen pressure is controlled to be 0.8-1.0 MPa, and the reaction temperature is controlled to be 70-80 DEG C. The used platinum-carbon catalyst is not recycled and recycled after being filtered and recycled, so that the loss of precious metal platinum is effectively reduced. Through the method, the reduction efficiency of CLT acid is remarkably improved, the generation amount of byproducts and dechlorination products is low, and the nitro conversion rate reaches 99.90% or above. The method has the advantages of small equipment volume, short reaction time, high reaction stability and selectivity, and low catalyst cost.

The invention relates to the technical field of organic synthesis, and provides a method for efficiently preparing 1, 3-cyclohexanedione through selective hydrogenation, which comprises the following steps: preparing hexagonal mesoporous silicon oxide by taking tetraethoxysilane as a silicon source and dodecylamine as a structure-directing agent, compounding the hexagonal mesoporous silicon oxide with titanium oxide to obtain a carrier, and taking palladium as a catalytic active component to prepare a catalyst I; preparing a copper-based coordination polymer by taking copper chloride dihydrate and phenylacetylene as raw materials; preparing a catalyst II by taking nickel as a catalytic active component; the method comprises the following steps: reacting resorcinol with hydrogen under the combined action of alkali, water, a catalyst I and a catalyst II, and then acidizing and recrystallizing to obtain the target product 1, 3-cyclohexanedione. According to the method, resorcinol is taken as a raw material, the self-made catalyst I and the self-made catalyst II are adopted for concerted catalytic hydrogenation, 1, 3-cyclohexanone with relatively high purity is prepared, and the catalysts are high in catalytic activity, easy to separate and still have very good catalytic performance after being recycled for multiple times.

The invention discloses a Cu-metal phthalocyanine heterojunction catalyst, a preparation method thereof and application of the Cu-metal phthalocyanine heterojunction catalyst in preparation of 2, 5-furandimethanol through electro-catalytic hydrogenation of 5-hydroxymethylfurfural. A CuO nanowire is used as a carrier, metal phthalocyanine nanoparticles are effectively loaded through the coordination effect of 3, 4-dihydroxybenzonitrile by utilizing solvothermal reaction, and then the Cu and metal phthalocyanine heterojunction catalyst is prepared through electroreduction. The preparation method is simple, the raw materials are low in price, no precious metal is used, the production cost is effectively reduced, and the industrial application prospect is good; the catalyst has excellent electro-catalytic hydrogenation performance: at room temperature and normal pressure, the selectivity of 2, 5-furandimethanol can reach 100%, the conversion rate of 5-hydroxymethylfurfural reaches 95%, and the Faraday efficiency reaches 89%.

The present invention relates to a catalytically active material, the preparation thereof, and the use of the catalytically active material, e.g. in the catalytic oxidation of CO to CO2 or in the catalytic hydrogenation of alkyne. The catalytically active material comprises a support5 comprising a metal oxide, and atomically dispersed noble metal on the surface of the support, wherein the metal oxide is selected from TiO2, CeO2, ZnO, SnO2, Ga2O3, In2O3, ZrO2, and Fe2O3, the noble metal is selected from Pt, Pd, Rh, and Au, and the catalytically active material is obtainable by a method comprising a step of non-thermal plasma treatment in the presence of O2.

A method for continuously producing m-xylylenediamine belongs to the technical field of organic synthesis and comprises the following steps: (1) mixing isophthalonitrile, toluene and liquid ammonia according to a mass ratio of 1: (3-5): (13-17) in a nitrogen atmosphere to form a reaction mixture; (2) heating the interior of a reaction bed containing a catalyst to 90-95 DEG C, continuously introducing hydrogen into the reaction bed, introducing the reaction mixture after the pressure intensity of the reaction bed is stable, and carrying out a catalytic hydrogenation reaction to generate a reaction product; and (3) carrying out gas-liquid separation on the reaction product, removing liquid ammonia from the liquid-phase product through an ammonia distillation process, and separating toluene and m-xylylenediamine through a rectification process to obtain m-xylylenediamine. According to the method, isophthalonitrile and hydrogen are used as raw materials, liquid ammonia and methylbenzene are used as reaction solvents, the raw materials and the reaction solvents are heated to 90-95 DEG C under the catalytic action of a catalyst for an exothermic reaction, m-xylylenediamine is generated through the reaction, and the reaction yield is larger than 99%.

The invention provides a catalyst for preparing phenol through catalytic hydrogenation of guaiacol as well as a preparation method and application of the catalyst. The preparation method of the catalyst comprises the following steps: fully dissolving magnesium nitrate, P123 and urea in deionized water, carrying out hydrothermal reaction, filtering, washing, drying and roasting to obtain an MgO carrier; immersing the MgO carrier in an alkali metal nitrate aqueous solution, drying and roasting to obtain an alkali metal element loaded MgO carrier; the alkali metal is selected from one of Li, Na, K or Cs; and immersing the alkali metal element loaded MgO carrier in a methanol solution of chloroplatinic acid, removing methanol, drying, and then carrying out reduction treatment to obtain the catalyst. The catalyst disclosed by the invention is applied to catalytic hydrodeoxygenation of guaiacol and shows excellent catalytic performance, the hydrodeoxygenation reaction conditions are mild, and the target product phenol can be obtained with high selectivity and high yield.

The invention provides a method for asymmetrically synthesizing an ubugepam chiral intermediate, which comprises the following steps: by taking N-Boc protected ketone ester as a raw material, forming an intermediate II through enamination of ketone and molecular lactam cyclization, obtaining an intermediate III through trifluoroethylation, removing Boc under an acidic condition to obtain an intermediate IV, and carrying out asymmetric synthesis on the intermediate IV under crystallization induction of 5-nitrosalicylaldehyde and chiral acid to obtain the ubugepam chiral intermediate. According to the present invention, the target of dynamic kinetic chiral resolution is achieved through the imine intermediate state, the selective construction of C-3 chirality is achieved, and the chirality of C-5 and C-6 sites is selectively controlled during double-bond cis-catalytic hydrogenation through the chirality of the C-3 site of the substrate so as to obtain the fragment A; the method is efficient, mild and suitable for large-scale production, high performance liquid chromatography chiral resolution is avoided, an expensive metal catalytic coupling step is avoided, application of enzyme catalytic reaction conditions with high technical barriers is avoided, and the amplification performance and the industrial production efficiency of the process are greatly improved.

The invention discloses a method for preparing olefin by catalyzing hydrogenation of carbon dioxide, which comprises the following steps: adopting a fixed bed reactor, reducing a prepared Fe3O4 catalyst by using hydrogen before reaction, and then introducing carbon dioxide and hydrogen for reaction. According to the catalyst, the strategy that an alkali metal accelerant is added to an iron oxide precursor, a transition metal structure additive is introduced or multi-element ferrite is synthesized in the past is changed, by changing the preparation method of the catalyst, CO2 hydrogenation for olefin preparation is efficiently catalyzed under the condition that no functional additive is added, the CO2 conversion rate is 40.3% under the reaction conditions that the temperature is 320 DEG C, the pressure is 1 MPa, the pressure is 8100 mL / (gcat.h) and the ratio of H2 to CO2 is 3, and the conversion rate of CO2 is 40.3%. When the product comprises CO, the selectivity of C2 + olefin reaches 74.2%, and the selectivity of by-products CO and CH4 is respectively as low as 10.8% and 3.8%. The catalyst is low in preparation cost, the method is simple and convenient, meanwhile, the catalyst has excellent reaction performance and good stability of olefin preparation through CO2 catalytic hydrogenation, and the catalyst has good industrial application prospects.

The invention provides a preparation method and application of low-cost 1, 4-naphthalene diphenol and a polyaryletherketone homopolymer of the low-cost 1, 4-naphthalene diphenol. The method comprises the following steps: mixing 1, 4-naphthoquinone, a polar solvent and a catalyst to form a mixture; feeding the mixture into a micro-channel tubular reactor, and introducing hydrogen to carry out continuous catalytic hydrogenation reduction reaction; separating the catalyst to obtain a reaction solution containing 1, 4-naphthalene diphenol; adding a non-polar solvent into the reaction liquid for crystallization; and separating to obtain a 1, 4-naphthalene diphenol product. The product obtained by adopting the preparation method and the preparation system provided by the invention is high in purity, good in color, strong in stability and suitable for industrial production, a high-quality raw material is provided for subsequent synthesis of the 1, 4-naphthalene structure polyaryletherketone homopolymer, and smooth proceeding of a polymerization reaction and stability of product quality are ensured.

The invention relates to a low-cost composite metal catalyst which is a CuO / ZnO / Al2O3 composite metal catalyst, and the molar ratio of CuO to ZnO to Al2O3 is (6-4): (3-4): (0.5-1). The composite catalyst is prepared by the following steps: adding carbonate into a mixed salt aqueous solution of copper salt, zinc salt and aluminum salt for co-precipitation, grinding a filter cake, and roasting at high temperature. According to the catalyst, 1, 12-dodecanedioic acid dimethyl ester which is low in price and easy to obtain can serve as a raw material, 1, 12-dodecanediol is prepared through catalytic hydrogenation under the milder condition compared with the prior art, high yield and low cost are achieved on the premise that the process condition control difficulty is greatly reduced and the process safety is improved, and the problems that in the prior art, 1, 12-dodecanedioic acid dimethyl ester is synthesized, and the cost is low are solved. The technical problems of high energy consumption, expensive catalyst, harsh reaction conditions and difficult realization of industrial production in the reaction process of 1, 12-dodecanediol in the prior art are solved.

The invention discloses a resource regeneration method of waste lubricating oil, relates to the technical field of petrochemical engineering, and belongs to the patent classification number C10M175 / 06. The preparation method comprises the following steps: adding a composite flocculant into the waste lubricating oil, heating and stirring, and then carrying out magnetic separation to obtain pretreated waste lubricating oil; uniformly mixing the pretreated waste lubricating oil, glycerol and a Ni / Al2O3 catalyst, then heating and reacting under pressure, and cooling to room temperature to obtain a catalytic hydrogenation product; and carrying out reduced pressure distillation on the catalytic hydrogenation product, recovering the lubricant base oil fraction, adding methanol and concentrated sulfuric acid into the distillation residual liquid, heating for esterification reaction, and separating the liquid to obtain the biodiesel. In the pretreatment process, the composite flocculant is used for removing acid and particle impurities in the lubricating oil, a traditional alkali adding neutralization precipitation process is replaced, the method is environmentally friendly, and the recovery cost of enterprises is reduced.

The invention relates to the technical field of chemical engineering, and particularly discloses a palladium-carbon catalytic hydrogenation reaction material treatment system, which comprises a three-dimensional workshop structure, an air-operated hoist, an air supply system, an air supply system and an air supply system, wherein the top of the three-dimensional workshop structure is provided with an elevator and a hoisting ton bag; the palladium-carbon circulating unit comprises a palladium-carbon preparation kettle, a hydrogenation reaction kettle, a decarbonization filter, a filter pressing cylinder, a sample splitter and a glove box which are connected in sequence, and the sample splitter is connected back to the palladium-carbon preparation kettle through a closed pipeline; the solid feeding unit comprises a ton bag feeder, a pneumatic valve and a spiral conveying pipe, and the tail end of the solid feeding unit is connected with a top feeding hole of the hydrogenation reaction kettle; the gas supply system comprises a hydrogen cylinder group and is connected to a gas distributor at the bottom of the hydrogenation reaction kettle through a pressure reducing valve and a flow regulating valve; through the multi-stage separation design and the safety interlocking mechanism of the palladium-carbon circulating unit, the recovery rate of the catalyst is increased, meanwhile, the pressure, temperature and stirring state are monitored in real time to trigger nitrogen purging or pressure relief, and the risks of hydrogen leakage and reaction out-of-control are reduced in combination with inert gas protection of the glove box.

The invention discloses a bimetallic MOFs mediated morphology-controllable catalyst, a preparation method and application thereof, and the preparation method comprises the following steps: respectively adding an iron salt, a cobalt salt and an organic ligand into an organic solvent, and then adding an alkaline regulator and a surfactant; transferring the stirred solution into a reaction kettle to carry out solvothermal reaction, and centrifuging, washing and drying the suspension after the reaction to obtain a bimetal organic framework (MOFs) precursor; and carrying out heat treatment in a gas atmosphere to obtain the catalyst. The bimetallic MOFs are obtained through a one-step solvothermal method, the size and morphology of the product are regulated through the alkaline regulator, agglomeration of catalyst nanoparticles can be reduced by adding the surfactant, the preparation method is simple, the specific surface area of the product is high, and when the catalyst is used for preparing high-carbon hydrocarbon through catalytic hydrogenation of carbon dioxide, the yield of the product is high. The conversion rate of carbon dioxide reaches up to 47.82%, the selectivity of high-carbon hydrocarbon reaches 59.68%, the selectivity of by-products carbon monoxide and methane is low, and the catalytic activity is good.

The invention discloses a catalyst and method for preparing 3-methyl-2-aminobenzoic acid through continuous catalytic hydrogenation, and the method comprises the following steps: pretreating an activated carbon carrier by using pretreatment reagents such as nitric acid and hydrogen peroxide to remove impurities in the carrier; modifying the carrier by using an auxiliary component 1 such as sodium carbonate, stannic chloride, potassium carbonate and lanthanum nitrate, and then roasting and reaming; and finally, active components such as platinum chloride and palladium chloride are mixed and impregnated with an auxiliary component 2 such as oxalic acid, polyethylene glycol-400, sodium metavanadate and polyvinylpyrrolidone, the auxiliary component 2 promotes dispersion of the active metal, and the auxiliary component 2 and the auxiliary component 1 have a synergistic effect, so that the active metal is loaded more uniformly and firmly, and the obtained catalyst has higher activity and selectivity and longer service life. The catalyst is applied to preparation of 3-methyl-2-aminobenzoic acid through catalytic hydrogenation in a fixed bed reactor, the reaction can be continuously and automatically controlled, the three wastes in the reaction process are few, the yield of a target product is high, the service life of the catalyst is long, and the catalyst is suitable for industrial production.

The invention relates to the technical field of power cables, and provides a marine power cable which comprises a conductor, an insulating layer, an armor layer and a sheath layer are sequentially arranged on the outer side of the conductor, and the sheath layer is prepared from, by weight, 40-50 parts of polyethylene, 35-45 parts of methyl vinyl silicone rubber, 30-40 parts of nitrile rubber, 8-10 parts of plasticizer, 40-60 parts of filler, 1-2 parts of antioxidant and 1-3 parts of vulcanizing agent; the nitrile rubber is composed of nitrile rubber A, nitrile rubber B and nitrile rubber C, and the nitrile rubber A, nitrile rubber B and nitrile rubber C have different molecular structures; the nitrile rubber A is obtained by polymerizing butadiene and acrylonitrile; the nitrile rubber B is obtained by catalytic hydrogenation of nitrile rubber; and the nitrile rubber C is obtained by ternary polymerization of butadiene, acrylonitrile and organic acid. According to the technical scheme, the problem of poor corrosion resistance of the marine power cable in the prior art is solved.

The invention discloses a preparation method of a cobalt-molybdenum catalyst and application of the cobalt-molybdenum catalyst in preparation of methyl mercaptan through CO2 / H2S hydrogenation. According to the method, a titanium source is used as a modification additive, ethanol is used as a structure-directing agent, a hydrotalcite-like precursor with a sheet-like characteristic is synthesized by a simple hydrothermal method, and an active component is further loaded on the basis, so that the cobalt-molybdenum catalyst with high dispersion and rich vacancies is finally obtained. The titanium source is added, so that the density of electron cloud around the active component is increased, transferred electrons promote the strength of Mo-S bonds and Co-S bonds to be reduced, the Mo-S bonds and the Co-S bonds are easier to break to form sulfur defects, and adsorption and activation of CO2 and H2S are promoted. Meanwhile, due to injection of extra charges, MoS2 is induced to generate phase change from a 2H phase to a 1T phase, and the catalytic hydrogenation capacity of MoS2 in the reaction process is improved. Finally, the cobalt-molybdenum catalyst shows considerable catalytic activity in a reaction system for preparing methyl mercaptan through CO2 / H2S hydrogenation.