2608 results about "Hydrogenation reaction" patented technology

The invention relates to a preparation method of phenylmethylamine. The technical scheme adopted by the invention for mainly solving the problems of high catalyst loss, low production efficiency and high intermittent operation labor intensity is as follows: the preparation method of the phenylmethylamine comprises the following steps: mixing the raw material of cyanobenzene with a solvent material or at least one of one part of product materials in a mixing unit, introducing the mixture into a fixed bed hydrogenation reactor to be in contact with hydrogen and a catalyst and carry out multi-phase continuous hydrogenation reaction to obtain a product material containing phenylmethylamine, separating the product material to obtain a phenylmethylamine product, wherein the catalyst is a metal loaded catalyst; and the metal is selected from at least one of Pd, Pt, Cu, Ni, Mo and Fe. The preparation method can be used for preparing phenylmethylamine.

The invention relates to a manufacturing method of high-density aviation fuel, in particular to an aviation fuel mixture based on monoterpenoids and a preparation method of the aviation fuel mixture. Comprising monoterpenoids, polyhydric alcohols and a catalyst which serve as raw materials, and the mass ratio of the raw materials to the polyhydric alcohols is 1: 1. The conversion rate is high, the treatment steps are reduced, the thermal stability and combustion gravimetric heat of the product are improved, and the method is suitable for preparing aviation fuel with high density, low viscosity and low-temperature performance; cyclization and hydrogenation are carried out through a one-pot method, a reaction container does not need to be transferred, and the operation is simple; according to the polyol solvent system, cyclization of the monoterpenoids becomes easier due to participation of polyol, and the conversion rate is increased; according to the dual-catalyst system, a combination of an acidic catalyst and a heterogeneous hydrogenation catalyst is used in a reaction container, so that efficient dehydration and hydrogenation reactions are ensured; the aromatic compound content in the fuel can be controlled by adjusting hydrogenation conditions.

The invention relates to the technical field of hydrogen storage and release, and discloses a cyclic hydrogen storage and release system based on aromatic cycloalkane reaction, which comprises a hydrogenation reaction unit, a dehydrogenation reaction unit, a gas-liquid separation and compression unit and an adsorption and purification unit which are sequentially connected through pipelines, the hydrogenation reaction unit, the dehydrogenation reaction unit and the gas-liquid separation and compression unit are respectively connected with the heat exchange unit; the hydrogen storage function and the hydrogen desorption function are integrally designed, the microwave heat supply dehydrogenation reactor is designed for the dehydrogenation reaction link with high energy consumption, and compared with the prior art, the microwave heat supply dehydrogenation reactor has the advantages that the heat transfer resistance is reduced, the reaction efficiency is improved, and the energy loss is reduced. The designed gas-liquid separation and adsorption purification technology is coupled, only one compressor is used in the whole process, the purification process is effectively simplified, the operation is simple and convenient, the equipment cost and the hydrogen purification cost are reduced, and the hydrogen yield and the hydrogen storage carrier cyclic utilization rate are improved. The system has the advantages of high hydrogen storage and release efficiency, small system size, high mobility and the like.

The invention discloses a method for preparing lithium carbonate from positive electrode material waste liquid, and relates to the technical field of lithium carbonate preparation. Comprising the following steps: adding hydrogen peroxide and sulfuric acid into the positive electrode material waste liquid, and carrying out solid-liquid separation to obtain an iron phosphate / carbon black solid mixture and a lithium-containing solution; adding a flocculating agent into the lithium-containing solution to perform primary impurity removal, filtering, performing secondary impurity removal through electric descaling, and performing suction filtration to obtain a lithium-containing purified solution; heating and concentrating the lithium-containing purified solution to obtain a concentrated solution; a sodium carbonate solution is added into the concentrated solution for a lithium precipitation reaction, and crude lithium carbonate and lithium precipitation mother liquor are obtained; uniformly mixing the crude lithium carbonate with water to obtain slurry, introducing CO2, carrying out hydrogenation reaction under a supergravity condition, and filtering after the reaction is finished to obtain a lithium bicarbonate solution; and carrying out thermal decomposition reaction on the lithium bicarbonate solution under a supergravity condition, adding a nucleating agent at the same time, and after crystals are separated out, carrying out suction filtration to obtain a lithium carbonate product and crystallization mother liquor. According to the method, lithium carbonate is prepared under the supergravity condition, coating and inclusion of foreign ions in the nucleation growth process can be avoided to a great extent, and a lithium carbonate product with relatively high purity is prepared.

The invention discloses an acetonitrile hydrogenation catalyst and a preparation method and application thereof. The acetonitrile hydrogenation catalyst is a transition metal modified Pt supported catalyst. A transition metal precursor adopted in the transition metal improvement is an oxide containing transition metal elements; the transition metal element is selected from at least one of titanium, vanadium, manganese, iron, cobalt, nickel and copper; the acetonitrile hydrogenation catalyst also comprises a carrier; the carrier is selected from at least one of gamma-Al2O3, SiO2, an MOR molecular sieve and a ZSM-5 molecular sieve. The catalyst can effectively catalyze acetonitrile hydrogenation to prepare ethylamine under mild reaction conditions. The supported catalyst provided by the invention has excellent reaction performance such as high acetonitrile conversion rate in acetonitrile hydrogenation reaction, the reaction condition is mild, the operation is simple, and the catalyst is easy to prepare and can be recycled.

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 provides a Claus tail gas hydrogenation catalyst as well as a preparation method and application thereof, and belongs to the technical field of sulfur recovery, the Claus tail gas hydrogenation catalyst comprises an aluminum-titanium-silicon-based composite carrier and active components, the aluminum-titanium-silicon-based composite carrier comprises Al2O3, nano TiO2 and SiO2, the aluminum-titanium-silicon-based composite carrier further comprises an antioxidant, and the active components comprise an active component and an antioxidant. Preparing an aluminum-titanium-silicon-based composite carrier by adopting a mixing and kneading mode; wherein the active components comprise oxides of VIII group metals, oxides of VIB group metals and oxides of rare earth metals, the rare earth metals are mixed and kneaded in the form of oxides and added into the composite carrier, and cobalt and molybdenum are loaded on the carrier by a dipping method. The catalyst has the characteristics of high low-temperature activity and strong oxidation resistance, has the function of catalyzing CO conversion, is suitable for being widely applied to hydrogenation reactors of sulfur recovery devices in the industries of petroleum refining, coal chemical industry and the like, and is particularly suitable for treating acid gas with relatively high CO2 content.

The invention discloses a system and a method for producing biological aviation kerosene by using waste oil and belongs to the technical field of biological aviation kerosene preparation. The method comprises the following steps: (1) the waste grease and a magnetic catalyst loaded with ionic liquid are mixed and enter a suspended bed pre-hydrogenation reactor for reaction to obtain a pre-hydrogenation product, a carrier in the magnetic catalyst loaded with the ionic liquid is Fe3O4 magnetic particles coated with a silicon dioxide layer, and the ionic liquid is molybdenum-based ionic liquid; (2) separating the pre-hydrogenation product to obtain a primary hydrogenation product; (3) performing hydrogenation upgrading on the primary hydrogenation product to obtain an upgraded intermediate product; (4) separating the upgrading intermediate product to obtain a secondary hydrogenation upgrading product; and (5) carrying out hydroisomerization reaction on the secondary hydrogenation upgrading product to obtain the biological aviation kerosene. According to the method, the magnetic catalyst loaded with the ionic liquid is adopted to catalyze the waste grease, recycling can be achieved under the action of a magnetic field, the catalytic stability is high, and industrial stable production can be achieved without supplementing the catalyst.

The invention discloses a catalyst for synthesizing low-carbon olefin through CO2 hydrogenation reaction as well as preparation and application of the catalyst. The catalyst comprises an active component A and a core-shell structure B (at) C, wherein the active component A is a metal oxide with catalytic activity for synthesizing low-carbon olefin through a CO2 hydrogenation reaction; in the core-shell structure B (at) C, B is an SAPO molecular sieve, and C is selected from one or more of B2O3, SiO2, Al2O3, TiO2, ZrO2, kaolin and montmorillonite. The catalyst is used for synthesizing low-carbon olefin through CO2 hydrogenation, and can obviously improve the CO2 conversion efficiency and reduce the CO selectivity.

The invention discloses a method for preparing 1, 5-pentanediol by catalyzing furfural conversion, and belongs to the technical field of biomass conversion. The method for preparing 1, 5-pentanediol by catalyzing furfural conversion comprises the following steps: furfural is taken as a raw material, ethanol is taken as a solvent, hydrogenation ring-opening reaction is carried out under the action of a hydrogenation catalyst, 1, 5-pentanediol is obtained, the hydrogenation catalyst comprises the following raw materials in percentage by mass: 0-1 wt% of Fe, 1-10 wt% of Cu, 20-40 wt% of Co and 50-80 wt% of La, and the content of Fe is not 0. The metals in the hydrogenation catalyst have a synergistic effect, so that furfural can be efficiently and highly selectively converted into 1, 5-pentanediol. According to the method, trace Fe is added into the hydrogenation catalyst, so that the problem that byproducts such as tetrahydrofurfuryl alcohol are generated from furfural is solved, and the selectivity of 1, 5-pentanediol is greatly improved.

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 discloses a method for preparing a single-benzene-ring liquid chemical through solvent-free hydrogenation degradation of polystyrene waste plastics based on a bifunctional catalyst. According to the method, Nb2O5 is taken as a carrier, 1-3wt% of noble metal ruthenium is loaded to prepare a bifunctional catalyst, and high-molecular-weight polystyrene is efficiently degraded into single-benzene-ring liquid chemicals such as benzene, methylbenzene and ethylbenzene through hydrogenation reaction under a solvent-free condition. Precious metal ruthenium hydrogenates a polystyrene long chain to generate a short-chain hydrocarbon intermediate, then a carrier # imgabs0 # acid site drives beta-cracking and hydrogen transfer reaction, and a single-benzene-ring product is directionally generated through the synergistic effect of the short-chain hydrocarbon intermediate and the carrier # imgabs0 # acid site. The method has the advantages of no solvent, reduced equipment cost, high reaction efficiency, simple reaction operation, mild reaction conditions, simple catalyst preparation process, high activity, selectivity and good stability, and is suitable for industrial production, and no other solvents preempt acidic sites. The method not only can realize cyclic utilization of resources, but also can alleviate the current environmental pollution problem.

The invention relates to the technical field of reactors, and discloses a uniform gas-liquid distribution suspended bed reactor for heavy oil hydrogenation, which comprises a reactor shell, a gas-liquid distribution disc is horizontally arranged at the lower end of an inner cavity of the reactor shell, a Venturi annular gas-liquid diffuser is arranged on the gas-liquid distribution disc, and a pre-distribution chamber is formed at the bottom of the gas-liquid distribution disc; the Venturi annular gas-liquid diffuser comprises an outer gas guide pipe arranged on the gas-liquid distribution disc in a penetrating mode. According to the Venturi annular gas-liquid diffuser, through the synergistic effect of a liquid-phase flow annular nozzle and a gas-phase flow annular nozzle, a liquid phase sprayed out at a high speed is actively sheared and broken relative to a low-speed gas phase, and uniform small bubble groups can be generated, so that the gas-liquid contact area is greatly increased; the dissolution rate and the mass transfer efficiency of the hydrogen into the heavy oil are remarkably improved, so that the hydrogenation reaction depth and the product quality are directly improved, and meanwhile, the catalyst in a catalyst suspended bed reaction zone is effectively protected.

The invention relates to the field of catalysts, and discloses a hydrogenation catalyst, a preparation method and application thereof, and a method for preparing alpha-methylbenzyl alcohol, the hydrogenation catalyst comprises a hydrogenation active component and a SiO2 carrier; the surface of the catalyst is modified by siloxane groups. The hydrogenation catalyst has the characteristics of high low-temperature hydrogenation activity and long service life. The hydrogenation catalyst is used in a liquid phase hydrogenation reaction and has high catalytic activity, so that a low-temperature liquid phase reaction can be better carried out, for example, the hydrogenation catalyst is used in preparation of alpha-methylbenzyl alcohol, the raw material acetophenone can obtain a high conversion rate, the alpha-methylbenzyl alcohol has high selectivity, and meanwhile, the hydrogenation catalyst is long in service life.

The invention relates to the field of biomass energy and chemical industry, in particular to an efficient methanol preparation method based on biomass graded catalytic conversion and cycle coupling. The method comprises the following steps: in a graded catalytic oxidation reaction system, mixing a biomass raw material with a composite vanadium-based catalyst, water, oxygen and circulating methanol for reaction to generate a gas-liquid mixture containing methyl formate; recycling methyl formate by using a gradient variable-pressure rectification separation system; carrying out an interface hydrogenation reaction under the action of a copper-zinc-LTA hierarchical pore catalyst to generate methanol; finally, part of methanol is purified and recycled through membrane separation. The method realizes efficient conversion from biomass to methanol, has the advantages of mild reaction conditions, low energy consumption, high yield and good catalyst stability, and opens up a new path for industrialization of preparation of methanol from biomass.

The invention relates to bio-based 1, 4-butanediol and a preparation method thereof, and belongs to the technical field of chemical raw material synthesis. The preparation method of the bio-based 1, 4-butanediol comprises the following steps: preparing a bio-based 1, 4-succinic acid solution; continuously feeding the obtained bio-based 1, 4-succinic acid solution and hydrogen into a fixed bed containing a first-stage nickel-copper catalyst, and carrying out hydrogenation reaction to obtain a first-stage product; continuously feeding the obtained first-stage product and hydrogen into a fixed bed containing a second-stage nickel-copper catalyst, and carrying out hydrogenation reaction to obtain a second-stage product; and feeding the obtained second-stage product into a separation tower for separation and purification to obtain the bio-based 1, 4-butanediol. According to the method, the polymer-grade bio-based 1, 4-butanediol is prepared through continuous liquid phase hydrogenation of the bio-based 1, 4-succinic acid, the purity of the obtained polymer-grade bio-based 1, 4-butanediol is larger than or equal to 99.90%, and the product does not contain methyl-1, 4-butanediol and does not contain 2-(4-hydroxybutoxy)-tetrahydrofuran.

The invention discloses a method for preparing polyol ester by carrying out hydrogen esterification reaction on long-chain olefin and polyol, which comprises the following steps of: by taking the long-chain olefin and the polyol as reactants, introducing carbon monoxide to control the pressure to be 1.0-8.0 Mpa and the reaction temperature to be 60-150 DEG C under the action of a composite catalyst consisting of a palladium compound, a phosphine ligand and organic acid and an organic solvent; and preparing to obtain the polyol ester for lubrication. Compared with the existing polyol ester synthesis method, the method has the advantages of mild reaction conditions, wide raw material applicability, high reaction activity and the like.

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 provides a preparation method of cyclohexylamine and dicyclohexylamine and a control method of dicyclohexylamine yield in cyclohexylamine and dicyclohexylamine co-production reaction, the method comprises the following steps: aniline and hydrogen are subjected to hydrogenation reaction in the presence of a catalyst to prepare cyclohexylamine and dicyclohexylamine, the raw materials also contain water, the water content is 0.1 wt%-3.0 wt% of the mass of aniline, and the water content is 0.1 wt%-3.0 wt% of the mass of hydrogen. The yield of cyclohexylamine and dicyclohexylamine is adjusted by adjusting the water content, and the flexibility and market competitiveness of a production device are improved.

The utility model provides a hydrogenation reaction system for producing sulfur by reducing acid gas regenerated by activated carbon, which comprises an acid gas pretreatment system, a first-stage hydrogenation system, a second-stage hydrogenation system, a tail gas treatment system and a liquid sulfur tank, the acid gas generated by regeneration of desulfurized activated carbon is pretreated and then is subjected to hydrogenation reduction to produce sulfur, the hydrogenation is divided into two stages, wherein the primary hydrogenation is divided into a plurality of sections according to different SO2 contents, a sectional hydrogenation method is adopted, gas subjected to the primary hydrogenation enters the secondary hydrogenation, air is introduced into the gas subjected to the secondary hydrogenation, and after side reaction products generated by hydrogenation are oxidized into sulfur and SO2, residual tail gas is sent back to an inlet of the activated carbon desulfurization device. Through first-stage hydrogenation and second-stage hydrogenation, the temperature rise of the hydrogenation reaction is reduced, side reactions are reduced, and the SO2 conversion rate is improved; oxidation-method tail gas treatment is adopted to directly return to activated carbon for desulfurization, and no waste gas is discharged on the whole.

The utility model relates to a slurry bed hydrogenation reactor for producing hydrogen peroxide by an anthraquinone process. The slurry bed hydrogenation reactor comprises a hydrogenation reactor, a recycle gas condenser and a degassing tank, wherein the bottom of the hydrogenation reactor is provided with a working solution feeding distributor and a hydrogen feeding distributor, the middle of the hydrogenation reactor is provided with a gas raising cylinder, the gas raising cylinder and a straight cylinder at the lower part of the reactor have the same diameter and are provided with a gap, and an overflow area is arranged above the gas raising cylinder; an annular space between the gas raising cylinder and the upper expanded section of the reactor is a discharging standing area, a discharging baffle is arranged at a discharging port of the standing area, a discharging pipe is connected with a degassing tank, and a gas phase balance pipe and a gas-liquid balance pipe are sequentially arranged at the top of the degassing tank from top to bottom; the top of the hydrogenation reactor is connected with the recycle gas condenser. By adopting internal and external circulation two-stage degassing and solid separation, the conditions that the discharged material of the hydrogen reactor carries hydrogen and the concentration of a catalyst is too high are avoided, and the consumption of raw materials is reduced.

The invention relates to a catalyst for preparing 1, 4-cyclohexanedimethanol through hydrogenation of dimethyl 1, 4-cyclohexanedicarboxylate as well as a preparation method and application of the catalyst. The surface of the carrier CeO2 is modified by Zn-Zr alloy, so that the carrier has richer oxygen vacancies, the dispersity of active metal on the surface of the carrier can be improved, and the active metal shows higher performance. The prepared catalyst is applied to a 1, 4-dimethyl cyclohexanedicarboxylate hydrogenation reaction, and 1, 4-cyclohexanedimethanol with higher conversion rate, higher selectivity and higher trans-cis ratio can be obtained.

The invention discloses a novel lactitol production process which comprises the following steps: dissolving lactose, carrying out hydrogenation reaction on a dissolved solution, filtering a hydrogenated solution by a ceramic membrane, decolorizing filtrate particles by a carbon column, concentrating a feed liquid after ion exchange of a decolorized solution, carrying out chromatographic separation on a concentrated solution, adding a seed crystal into a chromatographic extracting solution, concentrating, melting and granulating a concentrated material, and drying a granulated product. And grinding the dried product, and screening the ground product to obtain a finished product. According to the method, the generation of fine crystals and pseudo crystals in the crystallization process of lactitol can be avoided, the constraint of a traditional crystallization process is avoided, and the environment is not influenced while the cost is saved.

The invention relates to the field of medicine synthesis and preparation, in particular to a synthesis method of toxyanib phosphate. The use amount of acetic acid is greatly reduced in the preparation process, so that excessive acid does not need to be neutralized in the post-treatment process, and a large amount of wastewater is not generated; in addition, the use amount of sodium nitrite is reduced, and the environment and health are facilitated; the enamine reduction reaction does not use acetic acid as a solvent and a hydrogenation reaction catalyzed by heavy metal palladium, so that the safety of the reaction is improved, and the purity of the product is also improved; a decarboxylation reaction and a Vilsmeier-Haack reaction are carried out by a one-pot method, so that the reaction steps are reduced, and the product purity is improved; when aldol reaction is carried out in side chain splicing, side reaction and generation of isomer impurities are reduced. The method is short in route, mild in reaction condition, low in equipment requirement and convenient to operate, industrial production is easy to achieve, and a complex purification method is not needed.

The invention belongs to the technical field of medicine synthesis, and particularly relates to a preparation method of metaraminol bitartrate. The preparation method comprises the following steps: reacting benzyloxycarbonyl-L-alanine serving as a raw material with dimethylhydroxylamine hydrochloride, then reacting with 3-benzyloxybromobenzene, then carrying out one-step hydrogenation reaction to obtain m-hydroxylamine, and finally salifying to obtain the metaraminol bitartrate. The method adopts a one-step hydrogenation method to simultaneously realize dual effects of reduction and deprotection, reduces operation steps and material consumption, saves material cost, and reduces generation of reaction wastes; in the preparation process, reaction conditions are mild, safety and reliability are achieved, operation is easy, and the obtained target product is high in yield, good in selectivity and suitable for large-scale production.

The invention discloses an electro-catalysis method of Pickering emulsion for nitro compound hydrogenation, and relates to the technical field of catalytic hydrogenation, the Pickering emulsion is composed of an oil phase, a water phase and a platinum-loaded hydrophilic carbon nanotube catalyst; wherein based on the weight of the carbon nanotubes in the catalyst, the platinum accounts for 5.0 wt%-10.0 wt%; in the emulsion system, the particle concentration of the platinum-loaded hydrophilic carbon nanotube catalyst is 0.05 wt%-10 wt%; in the emulsion system, the hydrophilic carbon nanotubes have certain hydrophilicity and can be well dispersed in a water phase. According to the Pickering emulsion electro-catalysis method for nitro-compound hydrogenation, in a platinum-loaded hydrophilic carbon nanotube catalyst, the hydrogenation reaction of the nitro-compound can be effectively catalyzed when platinum is in a specific proportion range of 5.0 wt%-10.0 wt%.

The invention discloses a hydrofining method for optimizing the chromatic value of a bio-based terephthalic acid product, and belongs to the technical field of terephthalic acid hydrofining. The special refining process suitable for the bio-based CTA is formed by optimizing the whole process of pretreatment, hydrogenation reaction and post-treatment. The process not only solves the problem that the bio-based raw material has many impurities, but also realizes the balance of environmental protection and economy through the green solvent (water), the efficient catalyst (Pd / C) and controllable parameter design, provides a feasible path for the industrial production of bio-based PTA, and promotes the transformation of the polyester industry to sustainable development. The method provided by the invention is high in impurity removal rate, can efficiently purify the bio-based CTA to obtain a product meeting the PTA standard, is mild in reaction condition, realizes low-energy-consumption and high-stability operation under efficient catalysis, is small in process pollution, and reduces the environmental load.

According to the preparation method and the preparation system of the efficient circulating hydrogen-donating solvent for direct coal liquefaction, the circulating solvent prepared by the method has relatively high hydrogen-donating performance, the coal conversion rate and the oil yield in the direct coal liquefaction process can be remarkably improved, and the hydrogen consumption and the gas yield are reduced. The preparation method comprises the following steps: (1) fractionating the direct coal liquefaction oil in a first fractionating tower; (2) carrying out a first hydrogenation reaction on a mixed material obtained by mixing the heavy distillate oil and an initial solvent in a first hydrogenation reactor, and feeding the obtained product into a first separation unit for separation to obtain first-stage light distillate oil, first-stage medium distillate oil and first-stage heavy distillate oil; (3) performing a second hydrogenation reaction on a mixed material obtained by mixing the first-stage heavy distillate oil and the medium distillate oil in a second hydrogenation reactor, and feeding an obtained product into a second separation unit for separation to obtain second-stage heavy oil; and (4) mixing the second-stage heavy oil with the first-stage medium distillate oil to obtain the circulating hydrogen-donating solvent.

The invention belongs to a preparation method of a chemical intermediate, and particularly relates to a preparation method of dimethyl 1, 4-cyclohexanedicarboxylate, which comprises the following steps: carrying out hydrogenation reaction on dimethyl p-toluene in a solvent in a hydrogen atmosphere under the catalysis of a cerium dioxide loaded ruthenium monometal catalyst to obtain the dimethyl 1, 4-cyclohexanedicarboxylate, the invention discloses a method for preparing dimethyl 1, 4-cyclohexanedicarboxylate from dimethyl terephthalate through hydrogenation, which comprises the following steps: under the catalysis of a ruthenium-containing catalyst taking cerium dioxide as a carrier, carrying out hydrogenation reaction on dimethyl terephthalate in a solvent in a hydrogen atmosphere to obtain dimethyl 1, 4-cyclohexanedicarboxylate, and separating the dimethyl 1, 4-cyclohexanedicarboxylate from dimethyl terephthalate to obtain dimethyl 1, 4-cyclohexanedicarboxylate. And after the reaction is completed, the high-purity dimethyl 1, 4-cyclohexanedicarboxylate can be obtained only by filtering out the catalyst and concentrating to remove the solvent, and the operation is simple and convenient.