19973 results about "Reagent" patented technology

The present disclosure relates to compositions and methods for reversible fixation of biological samples using fixation reagents that form bis-carbamate crosslinks between amine-bearing moieties in biomolecules.

The invention belongs to the field of medical radioactive isotope preparation, and particularly relates to a method for extracting lead-212 and bismuth-212 from a thorium-232 decay chain, a solution containing a thorium-232 decay chain substance passes through an anion exchange resin column, the solution containing the thorium-232 decay chain substance contains halide ions, and the anion exchange resin column is used for extracting the lead-212 and the bismuth-212 from the thorium-232 decay chain substance. The concentration of hydrogen ions in the solution containing the thorium-232 decay chain substance is greater than 0.01 mol / L, the lead-212 and the bismuth-212 are adsorbed by the anion exchange resin column, other nuclides directly penetrate through the anion exchange resin column and are not adsorbed, a leaching reagent is introduced to desorb the lead-212 and the bismuth-212 from the anion exchange resin column, and the lead-212 and the bismuth-212 are separated and extracted; the method can be used for simultaneously extracting lead-212 and bismuth-212, has the advantages of high extraction speed and high purity, and is not easy to cause organic pollution to products.

The invention discloses an ammonia-coal co-combustion burner which comprises a plasma pulverized coal pre-combustion level module, an ammonia two-level combustion module, a pulverized coal main combustion level module and an air classification secondary air module. Plasma is generated by discharging between electrodes in the plasma pulverized coal pre-combustion stage module, pulverized coal carried by primary air is combusted through a plasma fire core area to generate first pulverized coal flame, and the first pulverized coal flame ignites ammonia fuel on the upper stream of the ammonia two-stage combustion module to generate stable ammonia-rich flame. Combustion products and unburnt reactants are mixed with downstream air in the ammonia two-stage combustion module to generate lean-ammonia flame for heating pulverized coal in the pulverized coal main combustion stage module to generate second pulverized coal flame, and the pulverized coal and ammonia gas are promoted to be fully combusted in the air classification secondary air module through secondary air, so that stable combustion of ammonia-coal mixed fuel is realized; the problems that ammonia coal combustion is unstable, NOx emission is too high and ammonia escapes are effectively solved.

Molybdenum-containing films are deposited on semiconductor substrates at relatively low temperatures of between about 100 and about 500° C., such as between about 200 and about 450° C. For example, molybdenum metal can be deposited at this temperature on a substrate having exposed metal and exposed dielectric in a substantially non-selective manner. In one implementation, a substrate having a recessed feature is provided, where the recessed feature has an exposed dielectric on the sidewalls and an exposed metal on the bottom. The substrate is exposed to a molybdenum-containing precursor, a reducing agent, and a silicon-containing reagent, to thereby reduce the molybdenum-containing precursor and form a molybdenum-containing layer that includes metallic molybdenum. The use of the silicon-containing reactant leads to a reduction in on-metal / on-dielectric selectivity of molybdenum deposition.

The invention relates to the technical field of drug analysis, and particularly discloses a real-time monitoring method and system for a drug raw material generation process, and the method comprises the steps: collecting reactant use data, equipment state data and production process data; processing the reactant use data to obtain a reaction process evaluation index, and matching according to the reaction process evaluation index to obtain a current reaction stage; processing the equipment state data to obtain an equipment state abnormity evaluation value, processing to obtain a production process stability evaluation value, and comprehensively analyzing to obtain a drug raw material generation quality evaluation value; and evaluating the drug raw material generation process according to the drug raw material generation quality evaluation value. According to the real-time monitoring method and system for the drug raw material generation process, the quality consistency of the drug raw materials can be ensured, potential quality problems in the raw materials can be found in time, corresponding measures are taken for correction, the quality risk of drug production is reduced, and the curative effect of drugs is improved.

Provided herein are systems and methods for use of carbon dioxide, such as carbon dioxide containing one or more contaminants, e.g., produced in processes where the carbon dioxide comes directly or indirectly from the atmosphere, in one or more systems to perform one or more processes that binds the carbon dioxide or one or more carbon dioxide reaction products with one or more reactants to produce one or more carbon dioxide sequestration products, for example, products that permanently sequester the carbon dioxide.

To provide a sample analyzer capable of achieving shortening of a measurement time and improvement of efficiency, in an inspection using a reaction to a plurality of kinds of reaction substances whose measurement ranges are largely different.SOLUTION: A sample analyzer 1 includes: a measurement unit 23 as an imaging device for capturing an image including light reception information based on each reaction between a first reaction substance group comprising a plurality of kinds of reaction substances reacting to a component included in a sample and a second reaction substance which reacts to the component included in the sample and is a different type from a reaction substance included in the first reaction substance group; and a control unit 50 as a control device for analyzing, in the light reception information in the image, the light reception information on the basis of a first determination value corresponding to a first substance group and the light reception information on the basis of a second determination value corresponding to a second substance.SELECTED DRAWING: Figure 10

The disclosure provides systems and methods for droplet processing. For example, a method can include providing a first droplet and a second droplet. In some cases, the first droplet may have a first concentration of a reagent and the second droplet may have a second concentration of the reagent. The second droplet may comprise a bead or a biological particle. The method can also include subjecting the first droplet and the second droplet to conditions sufficient to transfer the reagent from the first droplet to the second droplet, thereby decreasing the first concentration in the first droplet and increasing the second concentration in the second droplet.

The invention discloses a green preparation process of a microwave-assisted synthesized perovskite semiconductor material, which aims at solving the problems of long reaction period, large reagent dosage, heavy pollution and the like of the traditional perovskite preparation process, adopts a novel organic-inorganic hybrid precursor and green solvent system, and accelerates the reaction by microwave radiation. The rapid and environment-friendly synthesis of the material is realized by accurately regulating and controlling microwave parameters and combining multiple processes such as intermittent and collaborative ultrasonic processes. Novel compounds such as nitrogen-containing heterocyclic borate and organic phosphonate are introduced to optimize the performance of the material. The process significantly shortens the preparation period, reduces reagent consumption, improves photoelectric properties, and enhances material stability.

The invention relates to the technical field of processing and utilization of microorganisms and mineral resources, in particular to a rare earth extracting agent and application thereof. The rare earth extracting agent provided by the invention comprises silicon-decomposing microorganisms, acid-producing microorganisms or fermentation products thereof which are screened from rare earth mines and rare earth wastes and have good symbiotic effect, high compatibility and high activity, so that the silicon-decomposing and acid-producing efficiency is further improved, and the rare earth element extracting efficiency is high. The rare earth leaching agent provided by the invention is simple and safe in component, and solves the problems of large chemical reagent dosage, high production cost, serious environmental pollution and the like in the rare earth waste chemical leaching process. The method is suitable for popularization.

A doped or undoped silicon carbide film can be deposited using a remote plasma chemical vapor deposition (CVD) technique. One or more silicon-containing precursors are provided to a reaction chamber. Radical species, such as hydrogen radical species, are provided in a substantially low energy state or ground state and interact with the one or more silicon-containing precursors to deposit the silicon carbide film. A co-reactant may be flowed with the one or more silicon-containing precursors, where the co-reactant is a carbon-containing precursor and each silicon-containing precursor is a silane-based precursor with at least a silicon atom having two or more hydrogen atoms bonded to the silicon atom.

The invention discloses an activated carbon regeneration method based on ultrasonic coupling, and relates to the field of activation and regeneration. The method comprises the following steps: filling activated carbon to be regenerated into a reaction container, adding a target alkaline solution, and placing the reaction container in temperature-controlled ultrasonic equipment for oscillation treatment; adjusting the pH value of the solution in the reaction container, controlling ultrasonic waves to be uniformly distributed, discharging the solution after treatment, and flushing reactants to be neutral; transferring the reactants into an acid corrosion-resistant reactor, adding a preheated acid solution, and placing in double-frequency ultrasonic equipment for oscillation treatment; and cooling the reactor, adjusting the stirring speed, transferring the reactant after monitoring the conductivity to a set value, and carrying out flushing and vacuum drying to obtain regenerated activated carbon. According to the scheme, various pollutants on the activated carbon can be effectively removed, and the adsorption capacity and the specific surface area of the activated carbon are improved.

The invention discloses an acylhydrazone bond-linked three-component covalent organic framework material and application thereof in photocatalytic full-decomposition of water. The three-component COFs expands the designability of the structure and function of the porous organic material by generating ordered anisotropic tiling and ordered pores with abnormal shapes. In addition, COFs connected through acylhydrazone bonds have good thermal stability and chemical stability, and nitrogen atoms on the acylhydrazone bonds can provide a large number of sites for load metal. According to the invention, two electron-deficient and electron-rich nodes are introduced into a COFs framework to form a donor-pi-acceptor structure motif, and Pt metal nanoparticles are loaded onto a three-component covalent organic framework material by using a NaBH4 reduction method. The material has great potential in the aspect of producing H2 and H2O2 through photocatalytic full decomposition of water by taking water as a reactant while solar energy is utilized and a sacrificial agent is not added.

The invention discloses a device and a method for producing oxamide, and relates to the field of chemical production. The method for producing oxamide specifically comprises the following steps: mixing a methanol solution of liquid ammonia and a methanol solution of dimethyl oxalate, carrying out ammonolysis reaction, carrying out flash evaporation, filtration and drying on first slurry obtained after the reaction is finished to obtain solid oxamide, and refining a liquid phase obtained by solid-liquid separation of the first slurry to obtain a byproduct methanol, ammonia in the tail gas is washed and absorbed by dimethyl oxalate and then returns to a reaction system. In the oxamide production process, dimethyl oxalate reacts with ammonia gas in mixed gas generated in the reaction process, and the obtained product is continuously subjected to subsequent ammonolysis reaction, so that the utilization rate of reaction materials is increased; meanwhile, a condenser is not used for condensing ammonia gas and methanol and then separating alcohol and ammonia, so that condensing equipment and cooling water are saved, the production cost is reduced, and industrial production is facilitated.

The invention belongs to the technical field of electrolysis CO2 reduction, and discloses an electrocatalytic reduction system for preparing ethylene through electrochemical reduction of carbon dioxide and application of the electrocatalytic reduction system. The electrocatalytic reduction system comprises a cathode, an anode and an electrolyte, wherein the cathode is prepared by uniformly mixing and dispersing a copper-based catalyst, liquid micromolecular alcohols and a Nafion solution to obtain slurry and then spraying the obtained slurry onto carbon paper; the electrolyte is KOH electrolyte containing a sucrose additive. The copper catalytic reaction interface is regulated and controlled through sucrose molecules, the enrichment concentration of reactants near the reaction interface and key intermediates generated by catalyzing C2H4 is remarkably improved, generation of C2H4 through subsequent C-C coupling reaction is promoted, the yield of C2H4 is remarkably improved, meanwhile, the raw material cost is low, and wide application prospects are achieved.

The invention relates to the technical field of chemical reactions, and particularly discloses a reaction device and method for preparing high-purity molybdenum trioxide, and the reaction device for preparing high-purity molybdenum trioxide comprises a reaction kettle; the filter bag is arranged in the reaction kettle; the lifting column is arranged in the discharging sleeve in a lifting and sleeving manner; the lifting driving part is arranged at the upper end of the reaction kettle and is used for driving the lifting column to do lifting motion; the spoiler is movably arranged on the lifting column and located in the bag body; the bag body shakes up and down to effectively promote mixing of reaction solutions in the vertical direction and enhance the hierarchical fluidity of the solutions, meanwhile, the spoiler pushes the reaction solution in the center to the periphery and gathers the peripheral solutions to the center to form effective radial mixing, radial flow mixing of the reaction solutions is achieved, and the reaction effect is improved. Any possible local concentration gradient can be broken, uniform distribution of reactants in the whole reaction kettle is ensured, sufficient mixing of a reaction solution is ensured, and the product purity is effectively improved.

The invention relates to an inverse synthesis route planning method and system based on a multi-modal large model, and belongs to the technical field of chemical synthesis and artificial intelligence crossing. The method comprises the following specific steps: firstly, extracting three-dimensional molecular structure characteristics of a target product through a molecular encoder, and aligning the three-dimensional molecular structure characteristics with text modals of molecules; secondly, reasoning a possible reaction mechanism and a reaction type, and reducing an inverse synthesis search space; secondly, splitting a target product into reasonable synthesis subunits through structured marking and vocabulary expansion, data-driven atomic assignment learning and reaction center recognition and activity prediction; finally, SMILES representations and reaction paths of the reactants are generated. According to the method, the accuracy and interpretability of inverse synthesis path planning can be improved, and a new technical means is provided for automation and intellectualization in the fields of new drug development, material design and the like.

Described herein are digital microfluidic (DMF) devices and corresponding methods for managing reagent solution evaporation during a reaction. Reactions on the DMF devices described here are performed in an air or gas matrix. The DMF devices include a means for performing reactions at different temperatures. To address the issue of evaporation of the reaction droplet especially when the reaction is performed at higher temperatures, a means for introducing a replenishing droplet has been incorporated into the DMF device. A replenishing droplet is introduced every time when it has been determined that the reaction droplet has fallen below a threshold volume. Detection and monitoring of the reaction droplet may be through visual, optical, fluorescence, colorimetric, and / or electrical means.

A doped or undoped silicon carbide film can be deposited using a remote plasma chemical vapor deposition (CVD) technique. One or more silicon-containing precursors are provided to a reaction chamber. Radical species, such as hydrogen radical species, are provided in a substantially low energy state or ground state and interact with the one or more silicon-containing precursors to deposit the silicon carbide film. A co-reactant may be flowed with the one or more silicon-containing precursors, where the co-reactant can be a depositing additive or a non-depositing additive to increase step coverage of the silicon carbide film.

The invention discloses preparation of an ionic porous nitrogen-rich molecular cage and application of the ionic porous nitrogen-rich molecular cage in purification of iodine-containing nuclear medical waste, and the preparation method comprises the following steps: taking an ammonia or amine reagent as a bridge, taking an aldehyde or ketone reagent as a reaction monomer, adopting a Schiff base reaction principle, and utilizing a polydentate coordination mode to carry out imine condensation reaction on substances through a one-pot method to obtain the ionic porous nitrogen-rich molecular cage. Generating a porous nitrogen-rich molecular cage; then adding a reducing agent to further reduce the porous nitrogen-rich molecular cage, then combining with alkyl halide and an organic solvent, stirring, and carrying out rotary evaporation to obtain the ionic porous nitrogen-rich molecular cage. The method has the beneficial effects that a porous organic cage material with an ionic nitrogen-rich ligand is selected as an adsorbent, so that the physical and chemical properties are stable; the preparation method is simple in synthesis and high in yield, and the nitrogen-rich ligand is stable in structure, can adsorb iodine in a gas phase and iodine in a water phase, and can be recycled; the ion interference resistance is high, and the method adapts to iodine adsorption under the water phase condition that the pH is 3-11; the method can be applied to treatment of iodine in nuclear medical wastewater.

Vapor deposition processes for forming thin films comprising molybdenum on a substrate are provide. In some embodiments the processes comprise a plurality of deposition cycles in which the substrate is separately contacted with a vapor phase molybdenum precursor comprising a molybdenum halide, a first reactant comprising CO, and a second reactant comprising H2. In some embodiments the thin film comprises MoC, Mo2C, or MoOC. In some embodiments the substrate is additionally contacted with a nitrogen reactant and a thin film comprising molybdenum, carbon and nitrogen is deposited, such as MoCN or MoOCN.

The invention provides a redox imidazole covalent organic framework material as well as a preparation method and application thereof, belongs to the technical field of material preparation and photocatalytic preparation of hydrogen peroxide, and aims to solve the technical problem of low activity of a current covalent organic framework in preparation of hydrogen peroxide. The preparation method of the imidazole-connected redox type imidazole covalent organic framework material comprises the following steps: respectively reacting a reactant 2, 7-di-tert-butylpyrene-4, 5, 9, 10-tetraketone monomer with 4, 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ' The preparation method comprises the following steps: mixing 4, 4 '-(pyridine-2, 4, 6-triyl) tribenzaldehyde and a tri (4-formylphenyl) amine monomer, adding a solvent and a catalyst, uniformly stirring, and reacting to obtain the redox type imidazole covalent organic framework material after the reaction is finished. The application comprises the following steps: adding the covalent organic framework, oxygen and the sacrificial agent into water, and reacting under the irradiation of visible light. The preparation method is green, environment-friendly, simple and easy to implement, the prepared material has good thermal stability, and efficient visible light photocatalysis preparation of hydrogen peroxide can be achieved; meanwhile, the catalyst can be recycled and has good photocatalytic stability.

The invention relates to the technical field of hydrogen preparation, and provides a hydrogen storage device based on a solid hydrogen storage material and a hydrogen production method thereof.The device comprises a fuel tank internally provided with a reaction cavity used for containing an aluminum hydride material and mixed powder; the heater is arranged on the outer side of the fuel tank; the first end of the water recycling assembly is communicated with the reaction cavity, and the second end of the water recycling assembly is communicated with the fuel cell system so as to recycle water generated by the fuel cell system to the reaction cavity; the first end of the hydrogen discharging assembly is communicated with the reaction cavity, and the second end is communicated with a fuel cell system. According to the hydrogen storage device provided by the invention, through the application of the high-specific-energy solid hydrogen storage material aluminum hydride which can be stored at normal pressure and release hydrogen at a relatively low temperature, the thermal decomposition process of the metal hydride in the fuel tank and the coupling reaction process of the metal hydride and water are optimized, and the hydrogen is produced by utilizing the hydrolysis reaction of the aluminum hydride thermal decomposition reactant simple substance aluminum and the water; meanwhile, thermal decomposition of aluminum hydride is promoted through heat released by hydrolysis reaction, hydrogen release is coupled, and effective utilization of heat is achieved.

The invention provides a low-concentration chemical-physical coupling intelligent continuous porous carbon production method and system. The method comprises the following steps: pretreatment: crushing a carbon source to obtain a carbon precursor; carbonizing: heating and carbonizing the carbon precursor in a fluidized bed reactor to obtain a carbonized product; chemical activation: dipping the carbonized product in a chemical activator solution to obtain a chemical activated product, and drying the chemical activated product; physical activation: mixing a reaction gas and an inert gas as an activation gas, placing the chemical activation product in the activation gas, and performing gas activation at a preset temperature to obtain a physical activation product; and post-processing. By coupling chemical activation with physical activation, the concentration of a chemical activation reagent can be reduced, and the wastewater amount and the pollutant concentration after reaction are reduced by reducing the dosage of the reagent, so that the wastewater treatment process is simplified, the treatment agent and energy consumption is reduced, and the treatment cost is reduced.

The invention discloses a fingerprint-resistant coating of a chromium-plated part and a preparation method of the fingerprint-resistant coating, and belongs to the technical field of metal material plating surface treatment. Comprising the following steps: carrying out hydrolysis reaction on an organic siloxane coupling agent to obtain silane coupling agent hydrolysate; mixing and reacting the silane coupling agent hydrolysate, levodopa, an EDC hydrochloride reagent and a DMAP reagent to obtain modified levodopa; soaking the pretreated chromium-plated part in modified levodopa, taking out the pretreated chromium-plated part, soaking the pretreated chromium-plated part in a methacrylate solution, and polymerizing to obtain a polymethacrylate-poly-levodopa-chromium-plated part; and the polymethacrylate-poly-levodopa-chromium-plated part is soaked in a silver salt solution, and the fingerprint-resistant coating of the chromium-plated part is obtained. According to the method, the poly-levodopa adhesion layer is constructed on the surface of the chromium-plated part according to the molecular bionics principle, then the poly-levodopa is further polymerized to generate the polymethacrylate protection layer, and finally the fingerprint resistance of the chromium-plated part is improved through further coordination crosslinking of the silver salt solution.

The invention discloses a synthesis method of vitamin C ethyl ether, and belongs to the technical field of vitamin derivative synthesis. The synthesis method comprises the following steps: adding vitamin C, benzaldehyde and a catalyst into a first organic solvent, carrying out an aldolization reaction, adding an organic alkali after the aldolization reaction is finished, carrying out a neutralization reaction, adding an alkylation reagent, carrying out an alkylation reaction, and removing the first organic solvent after the alkylation reaction is finished, so as to obtain the vitamin C benzaldehyde. The preparation method comprises the following steps: adding a first organic solvent into a first organic solvent, pulping, filtering, collecting filter residues, washing and drying to obtain 5, 6-O-benzyl-3-O-ethyl-L-ascorbic acid, carrying out hydrogenation deprotection on the 5, 6-O-benzyl-3-O-ethyl-L-ascorbic acid, filtering after hydrogenation deprotection, collecting filtrate, crystallizing, collecting precipitate, washing and drying to obtain the 5, 6-O-benzyl-3-O-ethyl-L-ascorbic acid. The vitamin C ethyl ether is obtained. The synthesis method provided by the invention is simple to operate and high in production efficiency, and the obtained vitamin C ethyl ether is high in yield and purity.

The invention relates to a method for coating the inner surface of a glass container, which comprises a frosting step and a silicification treatment step, and is characterized in that before silicification treatment, the frosted glass container is inverted, the inverted angle of the glass container is adjusted to be 75-85 degrees, and meanwhile, the rotating speed is adjusted to be 30-90 r / min. The preparation method has the advantages that the preparation method is simple, the condition is mild, the environmental protection requirement is met, the mechanical wear resistance of the film layer is improved, the prepared film layer has small thickness deviation, excellent uniformity and stable quality, and the preparation method is suitable for deep processing of glass storage bottles, especially storage bottles for high-purity chemical reagents.

The invention relates to the technical field of food, in particular to diglyceride for reducing triglyceride, cholesterol and uric acid as well as a biological enzyme preparation method and application of the diglyceride. The preparation method comprises the following steps: (1) adding water and glycerol into vegetable oil, and then adding immobilized lipase to react to obtain a reactant; (2) centrifuging reactants, collecting a light-phase product, carrying out molecular distillation, and collecting a heavy-phase product to obtain diglyceride; the immobilized lipase comprises lipase and a carrier, the carrier comprises loofah sponge, soybean meal and bentonite, and the mass ratio of the loofah sponge to the soybean meal to the bentonite is 1: (2-4): (3-6). The method has the advantages that the effects of reducing triglyceride, total cholesterol and uric acid are relatively good, and the yield and the purity are relatively high.

Herein is provided a novel process for the preparation of methyl 6-(2,4-dichlorophenyl)-5-[4-[(3S)-1-(3-fluoropropyl)pyrrolidin-3-yl]oxyphenyl]-8,9-dihydro-7H-benzo[7]annulene-2-carboxylate by a Suzuki coupling of compound (3), wherein LG represents a leaving group, with an organoboron reagent:Compound (3) is obtained by activation of compound (4) with a leaving group LG, and compound (4) is obtained by alpha-arylation of methyl 5-oxo-6,7,8,9-tetrahydro-5H-benzo[7]annulene-2-carboxylate with 1-LG′-2,4-dichlorobenzene, wherein LG′ represents a leaving group:

The invention discloses a preparation method of 3, 4-difluoro-2-methoxyphenylacetic acid, and belongs to the technical field of organic synthesis. The preparation method comprises the following steps: reacting 2, 3-difluorophenol with 3, 4-dihydropyran under the action of sulfonic acid resin to generate an intermediate 2-(2, 3-difluorophenoxy) pyran; then lithiating, reacting with tert-butyl 2-bromoacetate, and performing acidolysis to obtain a 3, 4-difluoro-2-hydroxyphenylacetic acid intermediate; and finally reacting with a methylation reagent in the presence of alkali to generate the target compound 3, 4-difluoro-2-methoxyphenylacetic acid. The preparation method has the advantages that the route is overall reasonable, the preparation method comprises three steps, and a simple and effective new route is provided for the preparation of the 3, 4-difluoro-2-methoxyphenylacetic acid.