17 results about "Diffusion resistance" patented technology

The invention relates to the technical field of water treatment intelligent control, and discloses a biochar adsorption capacity dynamics simulation and prediction system, which comprises a data acquisition module, an Arrhenius equation is utilized to introduce a temperature correction coefficient to carry out thermodynamic compensation on an adsorption dynamics constant; the flow state recognition module judges a forward adsorption or reverse desorption working condition based on a Langmuir model; the resistance decoupling module is used for calculating a mass transfer Biot number based on a double-membrane theory so as to distinguish diffusion resistance in a liquid membrane and particles, and distinguishing physical blockage and chemical saturation by utilizing a physical blockage index; the lag compensation module introduces a lag correction factor to correct the desorption equilibrium concentration, and calculates the recovery adsorption capacity during the reverse desorption period; and the life prediction module corrects the theoretical residual capacity by using the dynamic utilization rate coefficient and generates an operation and maintenance instruction. According to the invention, through resistance decoupling and lag compensation mechanisms, physical and chemical attenuation mechanisms are effectively distinguished, and accurate prediction of the adsorption penetration time under the dynamic working condition is realized.

This invention discloses a method for hydrotreating catalytic cracking slurry. A fixed-bed hydrotreating process is employed, comprising: in the presence of hydrogen, the catalytic cracking slurry sequentially contacts a hydrotreating protectant, a hydrotreating transition catalyst, and a hydrodesulfurization catalyst to undergo a hydrotreating reaction, yielding hydrotreated oil. The hydrotreating protectant comprises an alumina support with a most probable pore size of 40–100 nm, molybdenum oxide, and cobalt oxide. The hydrotreating transition catalyst comprises an alumina support containing additives and MoO3 and CoO. The support has a bimodal pore size distribution, with smaller pores concentrated in the 10–40 nm range and larger pores concentrated in the 150–400 nm range. This method eliminates the diffusion resistance during the adsorption and reaction of large molecules on the catalyst surface during the hydrotreating of catalytic cracking slurry, increases the capacity for more deposits such as coke, extends the operating cycle of the unit, and facilitates hydrodesulfurization and other reactions. It also increases the content of tricyclic and tetracyclic aromatics in the hydrotreated oil, making it a high-quality feedstock for needle coke production.

The protective transportation device for the medical radiopharmaceuticals comprises a protective barrel, a protective cover and a plurality of adsorption assemblies arranged in the protective barrel, storage grooves are formed among the adsorption assemblies, the adsorption assemblies are distributed in the circumferential direction of an inner cavity of the protective barrel at equal angles, and the radial sections of the adsorption assemblies are each of a 90-degree fan-shaped structure; each adsorption assembly comprises a plurality of splicing frames, every two adjacent splicing frames are tightly attached, circulating holes are formed in the circumferential outer walls of the splicing frames, the multiple adsorption assemblies distributed in the circumferential direction at equal angles are arranged in the protection barrel, the radial section of each adsorption assembly is of a 90-degree fan-shaped structure, and the multiple adsorption assemblies are formed by stacking the multiple splicing frames; the circulation holes of the adjacent splicing frames are formed in a staggered mode to form a continuous snake-shaped airflow channel, the structure remarkably prolongs the escape path of radioactive gas, the gas is forced to undergo multiple times of steering and diffusion resistance when passing through the multiple adsorption layers, and therefore the leakage risk is effectively reduced.

The application relates to the technical field of intelligent water treatment control, and discloses a system for simulating and predicting the kinetics of the adsorption capacity of biochar, which comprises the following modules: a data acquisition module uses the Arrhenius equation to introduce a temperature correction coefficient to perform thermodynamic compensation on adsorption kinetic constants; a flow state recognition module determines a forward adsorption or reverse desorption working condition based on the Langmuir model; a resistance decoupling module calculates the mass transfer Biot number based on the double membrane theory to distinguish the liquid film and the internal diffusion resistance of the particles, and uses a physical blockage index to distinguish physical blockage and chemical saturation; a hysteresis compensation module introduces a hysteresis correction factor to correct the desorption equilibrium concentration and calculate the recovery adsorption capacity during the reverse desorption; and a service life prediction module uses a dynamic utilization rate coefficient to correct the theoretical residual capacity and generate operation and maintenance instructions. Through the resistance decoupling and hysteresis compensation mechanisms, the physical and chemical attenuation mechanisms are effectively distinguished, and the precise prediction of the adsorption breakthrough time under dynamic working conditions is realized.

This invention relates to a method for modeling the curing kinetics of polymer resins, specifically providing a method for fitting the curing kinetics of polymer resins based on a segmented model. The method employs a three-stage segmented kinetic model. In the first stage, an external catalytic model is introduced to quantify the inductive acceleration effect of the co-catalyst in the early stages of the reaction. In the second stage, the Kamal-Sourour model is used to ensure the fitting accuracy of the chemical control region. In the third stage, a diffusion correction term based on thermodynamic evolution is introduced to quantify the diffusion resistance caused by entering the glassy state in the later stages, significantly improving the fitting accuracy at the end of curing. More importantly, this invention creatively proposes a method based on the activation energy minimum point. α tr and dynamic glass transition point α vit The segmentation points effectively couple the external catalytic model, the Kamal-Sourour model, and the dynamic diffusion model, effectively solving the problem of inaccurate fitting of the full-cycle kinetics, improving the fitting accuracy, and providing data support for the fine-tuning of the curing process.

The invention discloses a method for preparing durene by utilizing unsym-trimethylbenzene and methanol, which comprises the following steps: mixing unsym-trimethylbenzene, methanol and hydrogen, heating and gasifying, feeding into a fixed bed reactor, and carrying out alkylation reaction through a molecular sieve catalyst with hierarchical pore distribution to prepare durene, after a reaction product flowing out of the alkylation reactor is subjected to gas-liquid separation and oil-water separation, liquid-phase hydrocarbon components enter a rectification separation system, and light hydrocarbon with the carbon number of C6 or below, methylbenzene, xylene, trimethylbenzene, tetramethylbenzene and aromatic hydrocarbon fractions with the carbon number of C11 or above are separated out. The mesoporous channel of the catalyst increases the contact probability of the raw material and the active site of the molecular sieve, promotes the playing of the activity of the catalyst in a fixed bed, reduces the diffusion resistance of the raw material and the product, promotes the rapid diffusion of the product, and reduces the occurrence of side reactions, so that the conversion rate of unsym-trimethylbenzene and the selectivity of durene are improved; therefore, high durene yield can be obtained.

The invention discloses a catalyst for improving an octane number in light naphtha isomerization and a preparation method of the catalyst. The catalyst comprises 40-70wt% of a carrier, 5-15wt% of a dispersing agent, 15-25wt% of a pore forming agent and 8-20wt% of transition metal, wherein the transition metal is based on the oxide thereof. The two active centers of the ZSM-5-5at-ZrO2 composite molecular sieve catalyst cooperate to catalyze cracking and alkylation, and due to the mesopores of the shell, the diffusion resistance is reduced, and the diffusion of reactants and products is accelerated, so that the ZSM-5-5at-ZrO2 composite molecular sieve catalyst has the characteristics of good accessibility of the catalytic active centers, high catalytic activity, good stability and the like.

Gas sensor for detecting the concentration of a specific gas in a gas of a measuring object, wherein the gas sensor comprises: a sensor element that an element body comprising an oxygen ion-conducting solid electrolyte layer, wherein a sample gas flow section is arranged in the element body, which allows the sample gas to be introduced into and flow through it, a measuring electrode that is arranged in the gas flow section of the object being measured, a device-gas-side electrode that is arranged inside or outside the element body in such a way that it comes into contact with the device gas, a reference electrode located inside the element body, and comprising a reference gas introduction section which allows a reference gas to be introduced into it and to flow through it to the reference electrode, the reference gas being used as a reference for detecting the concentration of a specific gas in the gas of the object being measured; a detection device which detects the concentration of a specific gas in the gas of the object being measured based on a voltage between the reference electrode and the measuring electrode; and a reference gas regulating device which allows an oxygen pumping current to flow between the reference electrode and the device gas-side electrode for pumping oxygen into the environment of the reference electrode from the environment of the device gas-side electrode, wherein a ratio R1 / R2 of a reaction resistance R1 of the reference electrode to a diffusion resistance R2 of the reference gas introduction section is greater than or equal to 0.1 and less than or equal to 2.0, wherein the reaction resistance R1 of the reference electrode correlates with the amount of oxygen to be pumped from the environment of the device gas-side electrode into the environment of the reference electrode, and the diffusion resistance R2 of the reference gas introduction section correlates with the probability that the oxygen in the environment of the reference electrode will be released to the outside.

The patent application relates to a paper-based packaging material with a carrier paper and a first coating arranged indirectly on at least one side of the carrier paper, wherein the first coating is a barrier layer and has an increased diffusion resistance to at least one substance selected from a group comprising fluid, gas, air, oxygen, carbon dioxide, nitrogen, inert gas, odorant, aromatic substance, water vapor, liquid, water, water-fat emulsion, fat, oil, mineral oil, and edible oil, odorant, flavorant, water vapor, liquid, water, water-fat emulsion, grease, oil, mineral oil, and edible oil individually or in combination, wherein the first coating is disposed between the carrier paper and a visually perceptible surface coating and directly contacts the surface coating. Furthermore, the invention relates to a package made of such a paper-based packaging material and a method of manufacturing the same.

The utility model provides a grinding device for preparing a diffusion resistance test sample. The grinding device for preparing the diffusion resistance test sample comprises a grinding disc and a pressure adjusting mechanism, the middle area of the grinding disc is a sample grinding area. The pressure adjusting mechanism is arranged above the grinding disc, the projection of the pressure adjusting mechanism on the grinding disc is located in a sample grinding area of the grinding disc, the pressure adjusting mechanism comprises a plurality of pressure applying heads with different weights, a grinding rod and a grinding head, and the grinding rod is arranged over the sample grinding area of the grinding disc. The grinding head is arranged at the end, close to the grinding disc, of the grinding rod, and the pressing head is detachably installed at the end, away from the grinding disc, of the grinding rod. The problem that the grinding pressure of the grinding device is not accurately adjusted can be effectively solved, and the uniformity and high quality of the surface of a sample are ensured.

The application provides an etching-induced defect FeSe-sepiolite composite material and a preparation method and application thereof, and belongs to the technical field of industrial flue gas purification. A selenium source, a reducing agent, an iron source and a surfactant are mixed, etched FeSe is prepared through a hydrothermal reaction-acid etching treatment, and then is mechanically ball milled with sepiolite to obtain the etching-induced defect FeSe-sepiolite composite material. In the composite material, FeSe serves as an active substance, can inhibit the organicization and re-release of mercury from the root due to the antagonism between Hg and Se, and reduces the risk of secondary pollution; sepiolite has a natural fibrous structure, can provide an efficient mass transfer channel, reduces the diffusion resistance of Hg 0 , and simultaneously strengthens the interface bonding between FeSe and sepiolite by means of the shear force generated by mechanical ball milling, so that the structural stability of the adsorbent and the resistance to flue gas scouring are improved.

This application discloses a two-dimensional polymer thin film based on reactive diffusion theory, its preparation method, and its applications. The film exhibits a typical bilayer structure: the lower layer is a continuous and dense covalent organic framework substrate film with good crystallinity; the upper layer is a cyclic / honeycomb Turing structure formed by the orderly assembly of nanoparticles, exhibiting strong periodicity and high uniformity. The preparation method employs gas-liquid interface reactive diffusion: the monomer is dissolved in a mixed solvent of DMF and chlorobenzene, and acetic acid is used as a catalyst, which is then dropped onto the surface of deionized water. By controlling the monomer concentration (5 mg / mL), molar ratio (2:3), drop volume (15 μL), and diffusion resistance, the Turing structure can be precisely controlled. This invention features a mild process, can be used for large-area preparation, and produces thin films with regular structures and excellent stability. It can be directly applied to flexible electronics, membrane separation, sensing, and catalysis, effectively solving the technical bottlenecks of uncontrollable morphology, low crystallinity, and difficulty in large-scale production of traditional two-dimensional polymer thin films.

The application discloses nitrogen-doped high-entropy alloy powder and a preparation method thereof. In order to solve the problems of low gap nitrogen solid solubility, easy precipitation of brittle metal nitride and uneven composition in the existing physical nitriding technology, the application adopts anhydrous metal halide, alkali metal amide and alkali metal azide as a reaction precursor. In the process of closed heating reaction, the amide is melted to provide a continuous liquid phase mass transfer medium; the azide is decomposed to release alkali metal and local high-pressure nitrogen gas; the alkali metal drives the metal halide to co-reduction; in the initial stage of nucleation and growth, the multi-component metal atoms are combined with the amino free radicals and high-pressure nitrogen gas in the system to directly embed nitrogen atoms into the lattice gap position, and high-concentration in-situ solid solution doping is completed. The application avoids the diffusion resistance of gas molecules in the traditional gas-solid nitriding, and realizes the preparation of alloy powder with high purity, uniform phase and no precipitation of brittle metal nitride.

The invention relates to the technical field of protective coatings, in particular to a high-temperature corrosion and erosion resistant composite coating on the surface of a gamma-TiAl-based alloy and a preparation method of the high-temperature corrosion and erosion resistant composite coating. The high-temperature corrosion and erosion resistant composite coating is prepared on the surface of a gamma-TiAl-based alloy matrix by adopting a vacuum physical vapor deposition method, and consists of a TiAlSiN or TiSiN bottom layer and a CrAlSiN surface layer. The composite coating has the dual functions of high-temperature corrosion resistance and diffusion resistance, in the high-temperature thermal exposure process, the surface CrAlSiN coating forms an Al2O3 and (or) Cr2O3 film with good oxidation resistance through the surface, and high-temperature corrosion protection is provided for gamma-TiAl-based alloy. And meanwhile, a Tix (Al) N + Ti5Si3 diffusion barrier layer is generated in situ on the interface of the TiAlSiN or TiSiN coating and the gamma-TiAl-based alloy at a high temperature, so that the mutual diffusion between the coating and the alloy is very slight. The composite coating provided by the invention is a hard coating, has excellent high-temperature oxidation resistance and hot corrosion resistance, and also has relatively high hardness, so that the erosion resistance and wear resistance are also relatively good.

The grinding device for preparing the diffusion resistance test sample comprises a grinding disc, a follow-up connecting structure, a liquid storage tank, a liquid distributor and a pipeline. The middle area of the grinding disc is a sample grinding area, and the follow-up connecting structure is fixedly arranged on the edge of the grinding disc on the periphery of the sample grinding area. The liquid distributor is located above the grinding disc and comprises a first end and a second end, and the first end is rotatably connected with the follow-up connecting structure; a plurality of nozzles are arranged at the second end and face the sample grinding area. The liquid storage tank is used for storing grinding liquid. One end of the pipeline is communicated with the liquid storage tank, and the other end is positioned in the liquid distributor and communicated with the nozzles. The grinding fluid can be uniformly distributed, and the problem of insufficient coverage or liquid splashing of the grinding fluid is avoided.

The invention discloses a multi-component alloy high-temperature anti-corrosion nanocrystalline coating for a nano motor and a preparation method and application of the multi-component alloy high-temperature anti-corrosion nanocrystalline coating, and relates to the technical field of nano motor protection and surface engineering. The coating is composed of, by weight, 50%-70% of Ni, 10%-25% of Cr, 5%-15% of Al, 1%-8% of Mo, 0.5%-2% of Ti, 0.5%-2% of Si, 0.1%-1% of Y, 0.05%-0.5% of Ce and the balance impurities. The nanocrystalline structure of the coating is uniform, and the oxidation diffusion resistance is excellent; the grain boundary purity is improved by rare earth elements Y and Ce; ti and Si elements improve hardness and phase stability.

The invention relates to a high-elasticity chemical cross-linked polyethylene foam material and a preparation process thereof, belonging to the technical field of preparation of polymer cross-linked foam materials. The problems of low crosslinking degree control precision, lack of multi-parameter cooperative control and contradiction between crosslinking density increase and gas diffusion resistance increase are solved. A 4 * 4 matrix temperature sensor, a near-infrared spectrometer crosslinking degree detection device and a gas concentration sensor are adopted to form a multi-point monitoring system; establishing a cross-linked foaming digital twinborn model containing coupling solution of a radial heat conduction equation, a reaction kinetic equation and a modified diffusion resistance equation; executing a predictive control algorithm based on sequential quadratic programming; a space-time decoupling regulation and control technology is implemented, a surface layer cross-linking strengthening area and an inner layer foaming optimization area are divided according to the boundary distance of 30 + / -5 mm, a radial concentration gradient is established through layered synchronous feeding, and when the cross-linking degree reaches 0.70 + / -0.05, a cross-linking reaction dominant period is switched to a foaming reaction dominant period. The cross-linking degree control precision is + / -5%, and the product percent of pass is increased to 92% or above.