136 results about "Disproportionation" patented technology

The invention discloses a preparation method of a modified zinc-bromine flow battery carbon felt negative electrode and the carbon felt negative electrode prepared by the method, and belongs to the field of zinc-bromine flow batteries. According to the method, after the carbon felt is soaked in a mixed solution of cuprous sulfate, water and acetonitrile, the acetonitrile is gradually evaporated from the solution through heating, the cuprous sulfate is gradually subjected to disproportionation reaction, and the copper elementary substance generated by the disproportionation reaction of the cuprous sulfate is deposited on the surface of the carbon felt, so that the purpose of loading the modified carbon felt with the copper elementary substance is achieved. The copper elementary substance is relatively stable in chemical property and has good zinc affinity, and the copper elementary substance is loaded on the surface of the carbon felt, so that the overpotential of zinc nucleation can be reduced, and reaction active sites on the surface of the carbon felt are increased. Besides, relatively strong acting force exists between copper and zinc, so that uniform deposition / stripping of zinc in the charging and discharging process is facilitated, a more uniform zinc deposition layer is formed on the surface of the carbon felt, formation of zinc dendrites is reduced, and the electrochemical performance of the zinc-bromine flow battery is improved.

The invention relates to the technical field of superfine molybdenum powder preparation, in particular to a preparation device and method for low-oxygen superfine molybdenum powder. The specific preparation device comprises a sublimation bin, a reaction area and a gas-solid separation bin which are sequentially connected, the reaction zone comprises a preheating zone, a reduction zone and a conversion zone; a part of the hydrogen pipeline and a part of the carbon monoxide pipeline are arranged in the preheating area; one end of the hydrogen pipeline extends to the reduction area and is used for providing preheated hydrogen and carrying out gas-phase reduction reaction on the preheated hydrogen and the gas-phase MoO3 subjected to heat preservation; one end of the carbon monoxide pipeline extends to the conversion area and is used for providing preheated carbon monoxide and reacting with water vapor to complete primary water vapor conversion; meanwhile, partial carbon monoxide is subjected to a disproportionation reaction to generate micro carbon powder, and the micro carbon powder and water vapor are subjected to a water gas reaction to complete secondary water vapor conversion. The problem that the oxygen content of existing superfine molybdenum powder prepared through gas-phase molybdenum trioxide reduction is too high is solved.

The system comprises a gradient catalytic reaction rectifying tower and a temperature control system, the rectifying tower is sequentially provided with a rectifying section, a reaction section and a stripping section from top to bottom, the reaction section is filled with an ion exchange resin solid catalyst, and the stripping section is filled with an ion exchange resin solid catalyst. The radiuses of the catalyst bag units are distributed in a gradient mode from small to large along the height of the tower, the catalyst bag units have the functions of catalytic reaction and mass transfer separation, the rectifying section and the stripping section are filled with structured packing or high-separation-capacity metal wire mesh packing, a gas-liquid separator is arranged at an outlet of the stripping section, and a temperature control system achieves segmented monitoring through a multi-point temperature sensor. The surface of the catalyst can be subjected to functional treatment to improve the decomposition resistance; the method comprises the following steps: feeding trichlorosilane generated by cold hydrogenation into the upper part of a reaction section from a feed port, carrying out disproportionation reaction at the gradient temperature of 20-100 DEG C and the pressure of 0.3-0.6 MPa according to the reflux ratio of (15-30): 1 to generate silane, and carrying out rectification and extraction separation to obtain high-purity silane with the purity of 99.999% or above.

A method for reducing a substrate selected from 2-methyl-5-nitropyridine and methyl 4-(2-fluoro-3-nitrobenzyl)piperazine-1-carboxylate is provided catalysed by a nitroreductase and a disproportionation agent.

The invention relates to a non-sulfur-tolerant wide-temperature shift regulation and control process based on a coal natural gas methanation process, and belongs to the technical field of coal chemical industry. The process comprises the following specific steps: carrying out non-sulfur-tolerant wide-temperature shift reaction on purified raw materials for methanation reaction, namely carrying out adiabatic and / or isothermal CO shift reaction under the conditions that the temperature is 200-360 DEG C, the pressure is 1-10 MPa, the molar ratio of H2O to CO is 0.7-2 and the air speed is 3000-40000h <-1 >, reducing the CO concentration at the inlet of a methanation reactor by 30-70%, and then carrying out high-temperature reaction on the methanation reaction to obtain the high-sulfur-tolerant methanation reaction. The CO disproportionation reaction in the methanation reactor is avoided while the circulating gas is effectively reduced, the service life of the existing methanation catalyst is prolonged by more than 50%, and the shutdown frequency and the maintenance time are greatly reduced.

The invention discloses a method for regenerating a toluene disproportionation catalyst, which is characterized by comprising the following steps of: contacting the toluene disproportionation catalyst to be regenerated with oxygen-containing gas in a rotary roasting kiln for roasting at the roasting temperature of 400-700 DEG C, preferably 550-600 DEG C; the time is 10 to 60 minutes, preferably 30 to 40 minutes. The catalyst is in rapid contact with oxygen in a rotary roasting kiln, the scorching temperature is high, the contact time is short, the inactivated disproportionation reaction catalyst can be effectively and completely activated, and meanwhile the specific surface area of the catalyst is increased.

This disclosure relates to a method for producing composite particles. The method comprises contacting catalyst particles, an oxidizing agent, and a plurality of monomers. The oxidizing agent is a peroxide, a persulfate, or ozone, and the catalyst particles are or comprise a material having Fenton or Fenton-like catalytic activity. The catalyst particles catalyze the disproportionation of the oxidizing agent to produce oxygen-radical species, which then initiate a polymerization reaction, thereby polymerizing the plurality of monomers, thereby forming a polymer shell around the catalyst particles. The present invention extends to composite particles produced by the method, an apparatus containing the composite particles, and the use thereof.

An integrated catalyst can be used in an olefin disproportionation reaction. The integrated catalyst contains a plurality of different integrated active phases. The relative positions among different active phases remain substantially unchanged during the olefin disproportionation reaction. The effective distance between respective bisecting planes of two adjacent different active phases is 0.5-5 mm, preferably 1-3 mm.

This invention discloses a superhydrophobic unsaturated transition metal chalcogenide compound, its synthesis method, and its applications. The invention involves heating chalcogenide powder to above its melting temperature to form a molten chalcogenide. This molten chalcogenide is then mixed with a reducing agent to undergo a disproportionation reaction. A strongly acidic solution containing transition metal cations is then added for aging, yielding a transition metal chalcogenide compound with a uniform porous structure, numerous surface defect sites, and a superhydrophobic surface. This transition metal chalcogenide compound exhibits good water resistance and high selective adsorption performance for nonpolar atoms and molecules, making it suitable for the removal of heavy metals or oxides from high-humidity flue gas. Furthermore, its unique porous structure and numerous catalytically active sites demonstrate good adsorption, capture, and catalytic conversion activity for oxidizing gases, making it suitable as an electroreduction catalyst.

The application discloses a preparation method of a lightweight oxidation-resistant coating on a carbon-based composite material surface, which comprises the following steps: brushing a slurry containing a carbon source on the surface of the carbon-based composite material, solidifying, forming a carbon source transition layer on the surface of the carbon-based composite material, and then performing a molten salt assisted infiltration treatment on the surface of the carbon source transition layer to obtain the lightweight oxidation-resistant coating. The preparation method of the application provides the carbon source for the subsequent process by pretreating the carbon-based composite material, and adds a suitable reinforcing phase to improve the bonding force between the coating and the substrate. Then, the molten salt disproportionation reaction is used to prepare the coating, the thickness and microstructure of the coating are strictly controlled by controlling the infiltration process, and finally, the smooth, uniform and dense lightweight oxidation-resistant carbide ceramic sealing layer is obtained. In the oxidation process, a glassy film is formed to seal the surface oxygen diffusion channel, the short-term ablation resistance is excellent, and the lightweight high-strength requirement of aerospace vehicles can be met.

The invention relates to the field of petrifaction and discloses a Mo-W heteronuclear bimetallic composite carrier catalyst as well as a preparation method and application thereof. The Mo-W heteronuclear bimetallic composite carrier catalyst comprises an Al2O3-SiO2 composite carrier with a three-dimensional ordered macroporous structure, and Mo-W heteronuclear bimetallic which is uniformly dispersed and loaded on the composite carrier in situ, wherein Mo and W are respectively combined with the surface of the composite carrier through Mo-O-Si and W-O-Al to form charge gradient polarization sites, the valence state of Mo is + 4 to + 6, and the valence state of W is + 4 to + 6. The catalyst provided by the invention has a good mass transfer effect, can give consideration to both acidic site density and metal dispersibility, and has high conversion rate, high selectivity and strong carbon deposition resistance when being applied to toluene disproportionation, aromatic hydrocarbon transalkylation, heavy aromatic hydrocarbon lightening and other reactions.

The present application relates to a kind of purification method of nitric oxide gas, comprising the following steps: crude nitric oxide gas is imported into extraction column, and the extraction phase obtained after extraction is imported into resolution column for temperature resolution;Nitric oxide gas resolved is imported into ethanol absorption tower after alkali washing tower and condenser;Again imported into the adsorption tower filled with 13X molecular sieve;After adsorption, the gas is collected into product collection bottle, and the purity of more than 99.99% nitric oxide product is obtained.The present application uses ferrous sulfate solution as extractant, extracts refined nitric oxide, realizes the efficient extraction of nitric oxide by the coordination reaction of ferrous ion and nitric oxide in the purification process, then uses ethanol as absorbent, utilizes the significant difference in solubility of nitric oxide and nitrous oxide in ethanol, can selectively absorb the nitrous oxide impurity difficult to remove, finally uses 13X molecular sieve to further remove nitrous oxide, which is beneficial to reduce disproportionation reaction and improve product purity.

The application discloses a kind of continuous co-production diphenyl dichlorosilane and triphenyl chlorosilane method and system, belong to organic silicon monomer synthesis technical field.The method will silicon powder and chlorobenzene direct method synthesis high-temperature gas phase product, after cyclone separation precision filtration dust removal, in turn through cascade condensation, obtain rich one phenyl trichlorosilane stream;It is directly introduced into disproportionation reaction kettle, and aluminium trichloride catalyst is added to carry out disproportionation and redistribution reaction;After reaction, add tertiary butyl alcohol, make aluminium trichloride into solid tertiary butyl alcohol aluminum, and remove by solid-liquid separation;Filtrate is separated by reduced pressure distillation, ultra vacuum distillation, and high-purity diphenyl dichlorosilane and triphenyl chlorosilane are obtained.The process coupling is closely, and heat energy is reasonably utilized, and catalyst treatment is green and environmental protection, and no strong corrosive gas and chlorine-containing wastewater is generated, the yield and selectivity of high value-added phenyl chlorosilane monomer are significantly improved, and the process is continuous and stable, with high degree of automation, suitable for large-scale industrial production.

This invention provides an activation method for a liquid fatty amine, a preparation process for the liquid fatty amine and silane, wherein the liquid fatty amine has a tertiary amine group; the activation method involves activating the liquid fatty amine with silicon tetrachloride; this method can significantly improve the catalytic effect of the liquid fatty amine, and the activated liquid fatty amine exhibits higher catalytic activity in the process of disproportionation of trichlorosilane to prepare silane, which can effectively reduce the reaction activation energy, increase the reaction rate, and improve the single-pass reaction efficiency and conversion rate.

The invention provides an electric furnace thermal reduction magnesium smelting co-production silicon carbon negative electrode material and a device thereof. MgO, SiO2, coke, biological pyrolytic carbon and methane gas are used as raw materials and are added into a magnesium smelting electric arc furnace for carbon thermal reduction to obtain mixed furnace gas; the mixed furnace gas enters a quenching condenser to be subjected to isentropic expansion and cooling treatment after being subjected to heat compensation through a heat compensation chamber, and solid-phase particles and cooling furnace gas are obtained; the solid-phase particles and the cooling furnace gas are cooled by a first cooling chamber to obtain ternary mixed powder, and the ternary mixed powder is subjected to the operations of metal magnesium vacuum distillation, magnesiothermic reduction and silicon monoxide disproportionation reaction offline; residual gas in the first cooling chamber is secondarily cooled through the second cooling chamber, and a primary material required by the silicon-carbon negative electrode material is co-produced in a gas-phase reaction mode in the magnesium smelting process, so that near-full continuous production of main links of the silicon-carbon negative electrode material and co-production coupling of carbon thermal reduction of magnesium metal are realized.

The present application belongs to the field of refinery dry gas utilization, and discloses a system and method for preparing propylene by disproportionation of refinery dry gas. The system comprises a raw material pretreatment unit, a disproportionation reaction unit and a product separation unit. The raw material pretreatment unit comprises, in sequence, an alkali washing package, a dry gas compressor, a dry gas absorption tower, a first desorption tower, a second desorption tower and a circulating carbon four cooler. The disproportionation reaction unit comprises a disproportionation reactor inlet-outlet heat exchanger, a disproportionation reactor and a reaction outlet cooler. The product separation unit comprises a deethanizer, a propylene rectification tower, a reaction separation tail gas absorption tower and a remaining carbon four cooler. The system and method can reduce the consumption of carbon four raw material, improve the recovery rate of ethylene in refinery dry gas and reduce consumption.

This invention belongs to the field of chemical catalyst preparation technology, and discloses a catalyst for the disproportionation of diethylamine to triethylamine. The catalyst includes a support, and MgO, ZnO, and rare earth oxides supported on the support. The content of each component, based on 100% mass, is as follows: support 80-85%, MgO 5-10%, ZnO 5-10%, and rare earth metal oxides 2-5%. When used for the disproportionation of diethylamine to triethylamine, the catalyst exhibits high diethylamine conversion and high selectivity for the triethylamine product. After separation, unreacted diethylamine can be recycled, while monoethylamine is collected separately or recycled back to the diethylamine synthesis unit, significantly reducing overall costs.

The invention relates to the technical field of distillation tower external equipment, and discloses a device for improving disproportionation reaction efficiency, which comprises a reboiler shell, one end of the reboiler shell is fixedly connected with an end cover through a flange, and the upper surface and the lower surface of the end cover are fixedly connected with a steam pipe and a condensate pipe respectively. The upper surface of the middle of the reboiler shell is fixedly connected with a gas phase pipe, and the bottom face of the end, away from the end cover, of the reboiler shell is fixedly connected with a liquid phase pipe. According to the device for improving the disproportionation reaction efficiency, through the matched design of the arc-shaped baffle and the bent pipe in the mixing box, phenol and DMC materials are subjected to hedging mixing in the spraying process, the mixing time is remarkably shortened, and the initial contact uniformity of reactants is improved; the double defoaming nets are matched with the floating pipe to automatically adjust along with the liquid level, so that foams in a gas-liquid mixture can be efficiently broken and removed, and the gas phase loss is reduced.

The invention discloses a functionally partitioned sulfur filler and a preparation method thereof. The functionally partitioned sulfur filler comprises a porous sulfur core and a polydopamine film, the surface of the porous sulfur core is coated with the polydopamine film; sulfur disproportionated bacteria are loaded in pores of the porous sulfur core; denitrifying bacteria are loaded on the surface of the polydopamine membrane, and a dissolved oxygen gradient is formed in the sulfur filler; an inner-layer anaerobic zone is arranged in the porous sulfur core and is used for performing sulfur disproportionation reaction; the surface of the polydopamine membrane is an outer-layer anoxic zone and is used for carrying out denitrification reaction. According to the present invention, the flora partition is constructed in the single filler, the sulfur disproportionation bacteria are separated from the external nitrate and the dissolved oxygen to a certain degree, the symbiosis and the cooperation of the sulfur disproportionation bacteria and the denitrifying bacteria are ensured, the sulfide and the polysulfide are produced through the internal sulfur disproportionation reaction, and the electrons in the sulfide and the polysulfide are supplied to the denitrifying bacteria for use so as to achieve the efficient and stable nitrogen removal.

This invention discloses a toluene shape-selective disproportionation catalyst, its preparation method, and its application. The toluene shape-selective disproportionation catalyst contains a modified ZSM-5 molecular sieve supported on alkaline earth metals and macroporous alumina. Its total acidity is 0.15–0.25 mmol / g, the acidity outside the micropores is no higher than 5.0 μmol / g, preferably 0.5–3.0 μmol / g, and the pore volume is 0.18–0.30 cm³. 3 / g, wherein the micropore volume is 0.05~0.12cm³. 3 Based on the weight of the toluene shape-selective disproportionation catalyst, the modified ZSM-5 molecular sieve has a mass content of 40-95% and the alkaline earth metal content is 0.5-1.5%. The catalyst preparation method includes the preparation of modified ZSM-5 molecular sieves supported on alkaline earth metals and the preparation process of catalysts containing modified ZSM-5 molecular sieves supported on alkaline earth metals. The catalyst preparation process is simple, reducing the acidity of the catalyst surface without affecting the pore flow of the catalyst, improving xylene selectivity while significantly reducing side reactions such as aromatic condensation, reducing carbon deposition, and increasing catalyst lifespan.

The utility model provides a preparation device of electronic-grade silane. According to the preparation device, a first disproportionation reaction is carried out on the basis of the first reactor, dichlorosilane is rectified and separated to serve as a raw material for a second disproportionation reaction, silane can be obtained on the basis of cheap trichlorosilane and a catalytic reagent, and electronic-grade silane can be obtained on the basis of traditional purification after rectification; based on heat exchange between tower top materials of the rectifying tower I and a tower kettle reboiler of the rectifying tower II, differential pressure thermal coupling integration is realized, condensing equipment and operation steps can be omitted, energy consumption is reduced, and the defects of high preparation cost and high energy consumption of a silane preparation device in the prior art are overcome.

The present invention provides a refrigeration cycle device capable of improving system performance while suppressing disproportionation reaction by injecting a working medium containing an ethylene-based fluoroolefin without coming into contact with a motor part of a compressor. This refrigeration cycle device uses a working medium containing an ethylene-based fluoroolefin, and is provided with a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a medium-pressure accumulator, and also with an injection pipe that feeds the working medium from the medium-pressure accumulator to a compression unit in the compressor. The working medium injected from the injection pipe to the compressor is compressed by the compressor and then is directly discharged to the outside of the compressor.

The invention relates to the technical field of biology, in particular to a method for improving the glucosyl coupling efficiency of hesperidin. The method comprises the step of contacting an isolated enzyme having cyclodextrin glucosyltransferase activity with hesperidin and a glucosyl group donor substrate in a reaction system to catalyze a coupling reaction of hesperidin with a glucosyl group to produce glucosylated hesperidin. The cyclodextrin glucosyltransferase is modified and an application process is optimized, so that the catalytic efficiency in a coupling reaction and a disproportionation reaction is improved, and particularly, the glucosyl transfer efficiency in the coupling reaction taking hesperidin as an acceptor substrate is remarkably improved; therefore, the hesperidin can be efficiently converted into the alpha-monoglucosyl hesperidin with better water solubility.

The invention provides a method for preparing methyl chlorosilane by using methyl chlorosilane high-boiling cracking residual liquid. The method comprises the following steps: by taking methyl chlorosilane high-boiling residue cracking raffinate, methyl trichlorosilane and trimethyl chlorosilane as main raw materials and Al2O3-V2O5-WO3 as a catalyst, carrying out cracking disproportionation in a high-pressure reaction kettle under the conditions of heating and pressurizing, and rectifying and separating a reaction product to obtain the dimethyl dichlorosilane. According to the method, the high-value dimethyldichlorosilane can be prepared from the hazardous waste methyl chlorosilane high-boiling cracking residual liquid through the disproportionation reaction, so that cyclic utilization of the high-boiling residue cracking residual liquid is realized, and the problems that the high-boiling residue cracking residual liquid is large in discharge amount, difficult to treat and the like are solved; and through catalysis of Al2O3-V2O5-WO3, the selectivity of dimethyldichlorosilane can be improved, toxic aniline substances carried in high-boiling residue cracking raffinate can be adsorbed, and the problems of environmental pollution and the like are solved.

The invention provides a method capable of producing a monocyclic aromatic hydrocarbon such as benzene or xylene effective as a base raw material, with a naphtha raw material containing renewable naphtha. The method for producing at least one monocyclic aromatic hydrocarbon of benzene or xylene with a naphtha raw material containing renewable naphtha includes step (A-1) of pyrolyzing the naphtha raw material in the presence of water vapor, to produce and separate toluene, and step (A-2) of subjecting toluene to disproportionation reaction or transalkylation reaction, to produce and separate at least one monocyclic aromatic hydrocarbon of benzene or xylene.

This invention discloses a single-atom catalyst for the disproportionation of SiHCl3 to SiH4 and its preparation method. The catalyst uses a transition metal as the active center, with single atoms dispersed on a high-temperature resistant support. High metal loading (0.5~5 wt%) and stable dispersion are achieved through coordination anchoring or high-temperature pyrolysis. This catalyst possesses single-atom active sites and strong interactions between the metal and the support, improving reactivity and SiH4 selectivity. The preparation method employs scalable technology, ensuring uniform distribution and stability of single atoms by optimizing the precursor ratio and heat treatment conditions. This catalyst achieves high SiHCl3 conversion and high SiH4 selectivity at relatively low temperatures (150~300℃), and has a long lifespan, making it suitable for continuous industrial production. It offers advantages such as high efficiency, low energy consumption, and long-term operation.

The invention discloses a device and a method for preparing a thiosulfate solution at normal temperature based on elemental sulfur, the device and the method are characterized in that two sections of sulfur packed beds are arranged, an alkali source and water are pumped into the two sections of sulfur packed beds, the first section of sulfur packed bed maintains anaerobic conditions, and the smooth proceeding of a sulfur biological disproportionation reaction is ensured; then, the second-section sulfur packed bed is aerated, so that generation of thiosulfate is promoted, and the high-concentration thiosulfate solution can be efficiently prepared through the process.

This utility model discloses a system for removing impurities from carbon-containing chlorosilanes and recovering chlorosilanes, comprising: a first distillation column for receiving and concentrating carbon-containing chlorosilanes; a first adsorption and reaction device connected to the first distillation column, the first adsorption and reaction device being filled with a metal adsorbent material and equipped with a silicon tetrachloride feed pipeline; a second adsorption and reaction device connected to the first adsorption and reaction device, the second adsorption and reaction device being filled with a methyldichlorosilane adsorbent material; a second distillation column connected to the second adsorption and reaction device; and a third distillation column connected to the second distillation column. This utility model can adsorb and concentrate metal impurities in carbon-containing chlorosilanes as a catalyst for the carbon removal reaction, effectively avoiding deactivation and failure caused by metal impurities encapsulating the resin catalyst, improving the conversion rate of methyldichlorosilane, and effectively avoiding the disproportionation reaction of silicon trichloride in the presence of the resin catalyst, thereby improving the carbon removal efficiency and chlorosilane recovery efficiency.

A toluene disproportionation process utilizing treated UZM-39 zeolite is described. The process produces an effluent stream containing para-xylene and benzene. The molar ratio of benzene to xylene (Bz / X) in the effluent stream can range from 1.00 to 1.14, the molar ratio of para-xylene to xylene (pX / X) in the effluent stream can range from 0.80 to 1.0, and the toluene conversion can be 20% to 40%.

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a preparation method and application of a supported silicon-based manganese lithium ion sieve. The preparation method comprises the following steps: fully stirring a lithium salt, a manganese salt and urea to form a complex, slowly dropwise adding a silica sol solution into the complex, carrying out a hydrothermal reaction, drying, calcining and annealing to obtain a precursor, and carrying out acid leaching and lithium removal on the precursor to obtain the supported silicon-based manganese lithium ion sieve. The method is simple in process and low in cost, the manganese disproportionation reaction is inhibited through the confinement effect of the silicon-based molecular sieve, the mass transfer efficiency is improved by combining the graded porous structure, the problem of extracting lithium from the salt lake brine with the high magnesium-lithium ratio is solved, and a new way is provided for efficient development of salt lake lithium resources.