23results about How to "Improve reaction stability" patented technology

The utility model discloses a kind of N, N-diisopropyl ethylamine neutralization distillation device, it is related to neutralization distillation technical field, the N, N-diisopropyl ethylamine neutralization distillation device, including neutralization reaction kettle, stirring mechanism and lye distribution mechanism are equipped in neutralization reaction kettle, lye distribution mechanism is installed in the upper portion of neutralization reaction kettle, it is arranged horizontally annularly, the lower end of lye distribution mechanism is fixedly connected with the upper end of stirring mechanism, and lye distribution mechanism is rotated simultaneously when driving stirring mechanism rotation, it is even sprayed into reaction liquid phase area in circumferential direction multiple points to alkali liquor, the efficient dispersion and mixing of alkali liquor are realized.The utility model is rotated by the synergistic effect of multiple point injection lye distribution mechanism and micro rectifier structure, realize the spatial uniform distribution and rapid mixing of alkali liquor in reaction system, effectively avoid local over-alkali, improve the uniformity, stability and product yield of neutralization reaction.

This invention discloses a graphene oxide / carbon nanotube-based coal combustion catalyst, its preparation method, and its applications, belonging to the field of catalytic combustion technology for efficient coal utilization. First, graphene oxide is used as a carrier, and then carbon nanotubes and manganese oxide are grown on its surface in a one-step process using condensation and redox reactions, followed by co-firing with coal. The graphene oxide / carbon nanotube-based combustion catalyst prepared by this invention effectively improves combustion efficiency, reduces the ignition temperature of coal, and lowers the reaction activation energy, resulting in significant economic benefits and broad application prospects.

A continuous solid-liquid reaction device for gas treatment belongs to the technical field of flue gas desulfurization and manganese resource recovery equipment and comprises more than three reaction kettles which are connected in series through gas guide pipelines, each reaction kettle is provided with a gas inlet pipe joint, a feeding pipe joint, a gas outlet pipe joint and a discharging pipe joint, and a gas distribution device communicated with the gas inlet pipe joint is arranged in each reaction kettle. A stirring device is also arranged; the gas distribution device comprises more than two layers of gas distribution pipes which are communicated through a communication pipeline; a plurality of gas distribution holes are formed in the side walls of the gas distribution pipes; the stirring device comprises more than two layers of stirring paddles, and the stirring paddles are arranged above each layer of gas distribution pipe. The core design of'mixing gas with liquid without mixing 'is adopted, the gas distribution device is combined with stirring, so that gas is uniformly released in a small bubble form, the retention time is prolonged, and multi-stage full utilization of the gas is realized in cooperation with the gas series design. And multi-layer graded gas distribution is matched with layered stirring, so that gas-liquid-solid three-phase contact is sufficient, the reaction is stable, and deposition and short circuit are avoided.

The application relates to the field of polyurethane foaming materials, and discloses a low-VOC polyurethane foaming compound and a preparation method thereof; the low-VOC polyurethane foaming compound comprises A component and B component which are mutually packed, the A component comprises low-aldehyde polyether polyol, polyether carbonate polyol, functionalized polyurethane oligomeric polyol, reactive tertiary amine catalyst, foam stabilizer and water, and the B component comprises a low-free-monomer isocyanate component; the functionalized polyurethane oligomeric polyol is prepared by reacting polyether carbonate polyol, diisocyanate and a hydroxyl compound containing a 1,3-dicarbonyl structure and having two or more hydroxyl groups. The preparation method comprises the steps of functionalized polyurethane oligomeric polyol preparation, A component dispensing, B component dispensing and packing. By introducing the reactive oligomeric polyol with the 1,3-dicarbonyl structure into the foaming system, the volatile components brought by raw materials can be reduced, and the continuous control ability of aldehyde components in the foaming process and the post-maturation process can be improved.

The present disclosure relates to a kind of multi-level hole pure silicon molecular sieve and its preparation method and cyclohexanone oxime catalytic reaction method.The multi-level hole pure silicon molecular sieve has the following diffusion coefficient characteristics: with cyclohexane as probe molecule, the diffusion coefficient of the probe molecule in the multi-level hole pure silicon molecular sieve is 0.015-0.02 μm 2 / min, measured by zero-length column method.The present disclosure can effectively improve the molecular diffusion performance of molecular sieve, and when the molecular sieve is used for cyclohexanone oxime gas phase Beckmann rearrangement reaction, the selectivity of caprolactam and the service life of catalyst can be effectively improved.

This application relates to the technical field of material conveying equipment, and provides a jetting device for pyrite, including a feeding tank. A distribution cone and multiple discharge ports are provided at the bottom of the feeding tank, and the discharge ports are evenly arranged around the distribution cone. A flow-turbulence device is provided between adjacent discharge ports. The flow-turbulence device includes a flow-turbulence component and a first gas supply pipe. The flow-turbulence component includes a flow-turbulence element, and the pulsed airflow injected from the first gas supply pipe causes the flow-turbulence element to reciprocate. By providing multiple discharge ports, this application can supply a large quantity and evenly of pyrite ore to the downstream reaction tank through multiple feeding pipes, enabling a continuous and stable reaction within the reaction tank. The flow-turbulence device between adjacent discharge ports effectively solves the problems of uneven fluidization, material accumulation, and bridging of the pyrite ore during its reciprocating motion.

The invention provides a method for blowing a micro-fine particle grade titanium-rich material in a fluidizing chlorination furnace, which comprises the following steps: step S1, drying and screening the micro-fine particle grade titanium-rich material to obtain titanium-rich material fine powder; s2, conveying the titanium-rich material fine powder to a chlorine pipeline of a boiling chlorination furnace; s3, the titanium-rich material fine powder is fully mixed with chlorine while being conveyed in a chlorine pipeline; and S4, a mixture of the titanium-rich material fine powder and chlorine is blown into a boiling chlorination furnace reaction zone. According to the method for blowing the micro-fine particle-grade titanium-rich material by the fluidizing chlorination furnace, the problem of resource waste caused by the fact that the micro-fine particle-grade titanium-rich material cannot be directly used for production of the fluidizing chlorination furnace is solved, efficient utilization of the micro-fine particle-grade titanium-rich material is realized through the blowing technology, the production cost is reduced, the energy consumption is reduced, and the yield and the quality of titanium tetrachloride are improved.

This invention belongs to the field of smart city information technology, specifically relating to an automated steady-state control method for industrial robots in the continuous production of recycled ABS plastics. It covers the entire continuous operation of recycled ABS from material conveying and reaction plasticization to finished product output. Employing core algorithms such as dynamic coordination of material conveying and reaction demand, steady-state control of multi-parameter coupling in the reaction process, and full-process quality data chain traceability, it overcomes the technical bottlenecks of traditional continuous recycled ABS production, including "disconnected conveying, process fluctuations, and lack of traceability." This achieves precise coordination of continuous material conveying, stable and controllable reaction processes, and traceable quality control of finished products, significantly improving the stability, production efficiency, and quality reliability of continuous recycled ABS production, and adapting to the automated production needs of large-scale continuous recycled ABS products.

The application discloses a method for preparing L-serine by enzyme catalysis, and in-situ preparation of low-cost and high-activity THF is achieved by using a biological method or a chemical method; THF and enzyme inactivation are avoided by precisely controlling the flow addition of formaldehyde; the reaction system is optimized to promote the in-vivo circulation regeneration of THF, so that higher conversion efficiency is achieved with less THF feeding amount, and the use amount and cost of the expensive coenzyme THF are significantly reduced. The method is based on the optimization of the existing enzyme process, does not need complex equipment modification, and is easy to realize industrialized scale production.

The application discloses the technical field of high polymer synthesis and functional material modification, and relates to a preparation method of low-molecular-weight polyacrylamide. The method comprises the following steps: firstly, preparing a double-metal doped multi-level pore carbon nanotube-covalent organic framework composite modification material, and the preparation process comprises the following steps: surface functionalization of multi-walled carbon nanotubes, growth of a covalent organic framework layer, doping of double-metal ions, and subsequent reduction and calcination treatment; then, adding deionized water, acrylamide and the modification material into a three-necked flask, stirring under nitrogen to dissolve the acrylamide, preparing an oxidation-reduction initiator solution, and dropping the initiator solution into the system under the protection of nitrogen, and polymerization reaction is carried out in a constant-temperature water bath at 19-21 DEG C. After the polymerization is completed, the product system is washed, filtered, and finally, low-molecular-weight polyacrylamide is obtained by using a vacuum freeze-drying method. The polyacrylamide prepared by the method has low and controllable molecular weight, and has good solubility and salt resistance.

The invention relates to a multi-grain-boundary cerium-based catalyst as well as a preparation method and application thereof. The multi-grain-boundary cerium-based catalyst comprises a multi-grain-boundary cerium dioxide carrier and an active component loaded on the carrier, the active component comprises any one or a combination of at least two of copper oxide, manganese oxide or cobalt oxide. According to the multi-grain-boundary cerium-based catalyst, multi-grain-boundary CeO2 is adopted as a carrier, and compared with a traditional single-crystal Ce-based catalyst, the multi-grain-boundary Ce-based catalyst has rich grain boundary defects, so that generation of an oxygen vacancy active structure is promoted, and higher photochemical reaction activity is achieved. The structural advantages are beneficial to adsorption and activation of reactants and generation of active oxygen species, so that the deep oxidation performance of the catalyst on VOCs is remarkably improved. Compared with the traditional thermocatalysis, the application of the photothermal catalysis technology reduces the energy consumption of external heating. The multi-grain-boundary cerium-based catalyst has excellent low-temperature degradation capability and reaction stability, so that the multi-grain-boundary cerium-based catalyst has a good application prospect in purification of VOCs (Volatile Organic Compounds) in industrial flue gas.

The present application relates to mixed reaction device, more particularly to fixed reactor technical field, and disclose a kind of viscous material mixing reaction device containing pitch and its process, including horizontal reactor and with one body kettle body, the kettle body is provided with driving portion, the driving portion is connected with positioning portion and swing portion, the positioning portion and swing portion are connected with reaction portion, the reaction portion is connected with material shaking portion, the horizontal reactor is provided with feeding port, the feeding port is equipped with feeding portion, the driving portion includes driving motor, the driving motor is installed on the shell of horizontal reactor, by the cooperation of helical blade and stirring rod, the rotation of stirring rod is realized in the process of revolution by viscous material flow, cooperate with the swing action of hinged ring one as axis, realize multidimensional strong disturbance mixing, different from traditional single stirring form, significantly improve material dispersion uniformity and reaction consistency, guarantee the overall stability of finished product.

This invention belongs to the field of catalytic ammonia oxidation technology, and specifically relates to a Ru / AMn2O4 catalyst for the gas-solid phase synthesis of methacrylonitrile, its preparation method, and its application. The catalyst preparation includes the preparation of an AMn2O4 spinel support, AMn2O4 spinel support pretreatment, and Ru / AMn2O4 catalyst preparation. The catalyst of this invention, prepared by the above method, possesses advantages such as high activity at low temperature, high stability, high conversion rate of methacrolein, high yield of methacrylonitrile, and low yield of the byproduct hydrogen cyanide. It is particularly suitable for use as a catalyst in the gas-solid phase ammonia oxidation of methacrolein to methacrylonitrile.

The invention discloses a near-distance nickel oxide cluster and nickel monatomic synergistic two-electron oxygen reduction electrocatalyst growing on a carbon substrate and a preparation method thereof, the preparation method comprises the following steps: carrying out oxidation treatment on the carbon substrate to obtain the carbon substrate with the surface rich in oxygen functional groups; dispersing the carbon substrate in a solvent to form a carbon-containing solution, and introducing a nickel salt metal precursor into the carbon-containing solution; under the action of a reducing agent, enabling the nickel precursor to form a nickel oxide cluster and nickel monatomic coexisting structure on the surface of the carbon substrate; and separating and drying to obtain the electrocatalyst. The electrocatalyst comprises a carbon substrate as well as nickel oxide clusters and nickel monoatoms which are distributed on the surface of the carbon substrate. The electrocatalyst can be applied to electrocatalytic preparation of hydrogen peroxide in a two-electron oxygen reduction reaction.

This invention relates to the field of CO2 resource utilization and hydrogenation catalysis technology, and discloses a highly zinc-loaded mesoporous alumina-based CO2 hydrogenation catalyst, its solvent-free preparation method, and its applications. The preparation method includes: mixing and stirring a structure-directing agent composed of a polyhydroxy organic compound and an organic acid, an inorganic acid, and an aluminum source in a sealed container to form a clear system; then slowly adding a zinc source solution and a copper source solution to obtain a homogeneous precursor; and finally drying and calcining to obtain the catalyst. The highly zinc-loaded mesoporous alumina-based CO2 hydrogenation catalyst (Cu-Zn@Al2O3) prepared by this invention has a specific surface area of ​​100–400 m² / g. 2 / g, with a pore size distribution of 2–50nm, which facilitates mass transfer and diffusion of CO2, H2, and products; the preparation method is solvent-free and uses a one-pot synthesis with few steps, suitable for the hydrogenation reaction of CO2 and H2 under fixed-bed conditions, and can be used to prepare methanol, methane, carbon monoxide and / or C1–C4 low-carbon hydrocarbons and reduce the CO2 content in the feed gas. When methanol is the main product, the methanol selectivity can reach ≥90%.

This invention discloses a nitrogen-carbon modified ethanol-to-butadiene catalyst, its preparation method, and its application, belonging to the field of ethanol-to-butadiene technology. The catalyst of this invention is loaded with two active components, M1 and M2. M1 is one or more of Cu, Zn, Ag, Cr, and Co, and M2 is one or more of oxidized Zr, Hf, Ta, Y, Sn, and Nb. The total loading of the active metals M1 and M2 in the catalyst is ≥0.1 wt%. The loadings of nitrogen and carbon in the catalyst are both ≥0.1 wt%. The support is a silicon-based support. The catalyst is obtained by co-impregnating a solution containing soluble salts of active components M1 and M2 and a soluble nitrogen-carbon source in the silicon-based support, drying, and calcining in an inert gas atmosphere. The catalyst of this invention exhibits extremely high activity and butadiene selectivity in the one-step ethanol-to-butadiene reaction, with an ethanol conversion rate of over 90% and a butadiene selectivity of over 70%. It can operate stably for over 200 hours and has excellent application prospects.

The invention relates to the technical field of electro-catalysis, and discloses a water electrolysis hydrogen evolution method which comprises the following steps: under a water electrolysis condition, taking a water electrolysis hydrogen evolution catalytic electrode as a working electrode to carry out water electrolysis reaction; wherein the water electrolysis hydrogen evolution catalytic electrode comprises a conductive substrate and a catalytic material compounded on the surface of the conductive substrate, and the catalytic material comprises a carbon-coated platinum-based alloy nano material and conductive carbon black; wherein the carbon-coated platinum-based alloy nano material contains a platinum-metal M alloy particle inner core and a graphitized carbon layer coated on the surface of the platinum-metal M alloy particle inner core, and the metal M is selected from at least one of Ni, Co and Zn. The water electrolysis hydrogen evolution method provided by the invention has relatively low reaction overpotential and relatively high reaction activity and stability.

The invention discloses a cobalt-based catalyst and a preparation method and application thereof, the cobalt-based catalyst is obtained by at least taking a cobalt-based precursor and an organic nitrogen source as raw materials through in-situ carbonization treatment; wherein the raw materials of the cobalt-based precursor at least comprise a cobalt salt, a zinc salt and an imidazole organic ligand. The preparation method comprises the following steps: dissolving cobalt salt and zinc salt in water to obtain a metal salt aqueous solution; the preparation method comprises the following steps: dissolving an imidazole organic ligand in water to obtain an imidazole organic ligand aqueous solution; the preparation method comprises the following steps: mixing a metal salt aqueous solution and an imidazole organic ligand aqueous solution, heating, aging, collecting a solid product, washing and drying to obtain a catalyst precursor; and mixing the catalyst precursor with an organic nitrogen source, and carrying out in-situ carbonization treatment to obtain the catalyst. The cobalt-based catalyst shows excellent catalytic activity and selectivity in the methanol oxidative carbonylation reaction, has good reaction stability, can still keep high methanol conversion rate and DMC selectivity after being recycled for five times, and has good industrial application potential.

This invention belongs to the field of phosphate binders, specifically relating to a linear saturated aliphatic dicarboxylic acid-iron(III) complex, its preparation method, and its applications, particularly its use in preparing drugs for the treatment or prevention of hyperphosphatemia. In the dicarboxylic acid-iron(III) complex, the molar ratio of iron to dicarboxylic acid is 1:0.8~1.2, and the dicarboxylic acid is a linear saturated aliphatic dicarboxylic acid. The complex is prepared by reacting a ferric salt and a dicarboxylic acid salt in a solvent. In vitro phosphate binding experiments demonstrate that the dicarboxylic acid-iron(III) complex of this invention exhibits high phosphate binding capacity per unit mass of iron within the pH range of 3-7, and maintains a high phosphate binding capacity per unit mass of iron in vivo, significantly superior to commercially available sucrose ferric hydroxide chewable tablets. As an oral phosphate binder, the complex of this invention exhibits stronger phosphate binding capacity per unit mass of iron in vivo, higher iron utilization, lower total iron intake, and fewer adverse reactions.

The invention specifically discloses a zwitterion-doped nickel-iron layered double hydroxide nano material as well as a preparation method and application thereof, and belongs to the field of electrolysis seawater oxygen evolution catalysis. According to a core part of the catalytic nano material, cation-doped nickel-iron layered double hydroxide is constructed on a foamed nickel substrate in situ from bottom to top, and a vanadium-doped nickel-iron layered double hydroxide nano sheet material grows on the foamed nickel substrate in situ by utilizing a hydrothermal method; the doping of vanadium can effectively adjust the electronic structure of the catalyst, and then a phosphate radical protection layer is constructed on the surface of the catalyst through low-temperature phosphorization, so that the active components of the catalytic material are protected, and the corrosion of harmful chloride ions in seawater to the catalyst is relieved. As a catalyst for seawater electrolysis oxidation, the composite material shows very excellent reaction activity and stability, and has important potential application value in preparation of a transition metal oxygen evolution electro-catalytic material for seawater oxygen evolution reaction.

The present application relates to a kind of continuous discharge reaction kettle unit of pseudo-boehmite, belong to inorganic material synthesis equipment technical field;Including stepped main reactor, the stepped main reactor is in vertical direction and presents stepped variable-diameter structure, at least including first stage reaction section and second stage reaction section from top to bottom, the top of the stepped main reactor is equipped with the feed inlet being connected with the discharge port of the premixing unit, the stepped main reactor is equipped with boost system, the stepped variable-diameter structure cooperates boost system and is synergistically regulated slurry flow rate and residence time;By variable-diameter structure, material flow cross section is changed, gradient flow rate and uniform turbulent flow field are formed, cooperate boost system active flow guide and push, accurately regulate slurry flow rate and each stage residence time, completely solve the problem of traditional equipment flow field disorder, short circuit flow, dead zone, inhibit solid slurry settlement and plugging failure from root, substantially improve the stability of equipment continuous operation.

The application discloses a kind of multi-level hole EUO molecular sieve and its preparation method and application, the morphology of the multi-level hole EUO molecular sieve is fusiform;With micropore and mesopore;The pore volume of micropore is 0.12~0.15cm 3 / g;The pore volume of mesopore is 0.14~0.25cm 3 / g.The synthesis route is prepared by the optimization of silicon-aluminum source and synthesis system ratio and the addition of seed crystal, and the high crystallinity multi-level hole EUO molecular sieve is prepared by one-step hydrothermal crystallization method.The EUO molecular sieve described in the application has excellent diffusion performance due to its larger mesopore pore volume, and has excellent reaction stability in meta-xylene isomerization reaction.

The preparation method adopts a two-step method for preparation, and comprises the following steps: S1, taking a sodium hydrosulfide aqueous solution as a base material, synchronously dropwise adding a cyanuric chloride alcohol solution and a hydroxide aqueous solution, and controlling the temperature and the pH value to generate a dimercaptotriazine derivative intermediate; s2, synchronously dropwise adding functional monomers (such as isopropylamine and diisobutyl dithiophosphoric acid) and a hydroxide aqueous solution into the intermediate, and controlling the temperature to prepare a target derivative; according to the preparation method, the reaction yield reaches up to 95.84%-97.13%, the product content is 15.6%-17.01%, selectivity is high, side reactions are few, the structure can be regulated and controlled by replacing functional monomers, and the dimercaptotriazine derivative can serve as a core intermediate of a sulfide ore flotation collecting agent and has industrialization potential.