101 results about "Conversion reaction" patented technology

A direct air capture (DAC) of CO2 system includes a reaction reactor having a solid, amine-functionalized sorbent configured to sequester CO2 from air; an in-situ dual-function device configured as a CO2 conversion reactor and an exchange fluid regeneration device; and the exchange fluid, recirculating between the reaction reactor and the dual-function device, configured to capture the sequestered CO2 from the solid sorbent in the reaction reactor and release the captured CO2 in the conversion reactor, the exchange fluid including one or more amino acids.

The invention relates to a method for separating heavy metal cations and radionuclides from aqueous solutions. The method according to the invention can be used to separate dissolved and / or suspended naturally occurring ions or radioactive ions produced by radioactive decay, nuclear transformation reactions such as nuclear fission, or, for example, by activation with neutron radiation, from aqueous solutions.

The application discloses a processing method of aromatic raffinate oil. The method comprises the following steps: (1) contacting and reacting aromatic raffinate oil, hydrogen and a hydroconversion catalyst in a hydroconversion reaction zone, wherein the hydroconversion catalyst is a molecular sieve catalyst, and the molecular sieve is selected from any one of mordenite or ZSM-5 molecular sieve; (2) separating the hydroconversion reaction effluent obtained in the step (1) to obtain a hydrogen-rich gas and a liquid phase stream; and (3) separating the liquid phase stream obtained in the step (2) to obtain a liquid phase product and a gas phase product. The method can effectively convert isomeric alkanes in the aromatic raffinate oil into n-alkanes, and improve the ethylene raw material quality.

The application discloses a method for producing ethylene raw material. The method comprises the following steps: mixing hydrocracking light naphtha and hydrogen into a first hydroconversion reaction zone to react, and then the reaction effluent enters a separation system to obtain hydrogen-rich gas and a first hydroconversion product; the first hydroconversion product is separated to obtain ethane, propane, isobutane, isopentane and n-pentane; the isobutane is mixed with hydrogen into a second hydroconversion reaction zone, and the reaction effluent is separated to obtain n-butane; the second hydroconversion reaction zone is filled with a hydroconversion catalyst containing ZSM-35 molecular sieve; and the isopentane is recycled to the inlet of the first hydroconversion reaction zone. The first hydroconversion reaction zone is filled with a hydroconversion catalyst containing mordenite, and at least two catalyst beds are filled; and the active metal content of the hydroconversion catalyst decreases in turn along the flow direction. The method can effectively improve the proportion of normal alkanes in the product and improve the quality of the ethylene raw material.

The application discloses a CO2 capture method and system based on fuel staged conversion coupled with chemical looping combustion, and the method comprises the following steps: flue gas is introduced into a carbonation tower filled with metal oxygen carriers MeO and adsorbents A, the adsorbents A adsorb CO2 in the flue gas, and then the solid in the tower is transported to a calciner; the adsorbents A after adsorption are decomposed into the adsorbents A and CO2 in the calciner, the MeO in the calciner reacts with the substances transported in a fuel pre-conversion reactor to generate a reduced metal oxygen carrier; the regenerated adsorbents A and the reduced metal oxygen carrier in the calciner are transported to an air reactor to generate MeO and regenerated adsorbents A which are returned to the carbonation tower; fuel and reactants are introduced into the fuel pre-conversion reactor, part of the fuel is converted, and the products are sent into the calciner. Through fuel partial conversion and chemical looping combustion, the application realizes grade matching of the fuel conversion and the adsorbent regeneration process, avoids air separation energy consumption of separated pure oxygen, and effectively reduces CO2 capture energy consumption after medium-high temperature adsorption combustion.

This invention belongs to the field of catalytic reaction technology, specifically disclosing a Fischer-Tropsch synthesis catalyst regeneration and carbon dioxide co-production reactor and its co-production process. The reactor includes a Fischer-Tropsch synthesis fixed-bed reactor, a carbon monoxide conversion reaction unit, and a tail gas discharge unit. The Fischer-Tropsch synthesis fixed-bed reactor is filled with a Fischer-Tropsch synthesis catalyst for the Fischer-Tropsch synthesis reaction and catalyst carbon deposition and char regeneration. The carbon monoxide conversion reaction unit is located downstream of the Fischer-Tropsch synthesis fixed-bed reactor and converts the carbon monoxide generated during char regeneration into carbon dioxide. The tail gas discharge unit outputs carbon dioxide-rich gas and removes residual oxygen from the tail gas. By performing in-situ conversion of carbon monoxide during regeneration, this invention can significantly increase the volume fraction of carbon dioxide in the regenerated tail gas and provide a stable feedstock for the downstream carbon dioxide hydrogenation to methanol reaction, thereby achieving synergy between catalyst regeneration and efficient utilization of carbon resources.

This invention provides a method for producing vitamin B12 using microchannel reaction technology. The method involves acidifying, hydrolyzing, filtering, and analyzing the vitamin B12 fermentation broth, followed by a cyanidation reaction in a microchannel reactor. Further filtration, analysis, and concentration yield vitamin B12. This method produces cyanide-treated vitamin B12 with a thorough conversion reaction and increased yield. It also reduces the amount of cyanide used, thus reducing pollution and costs. The equipment has good airtightness, and the small amount of hydrogen cyanide gas generated is completely recovered and centrally treated, greatly reducing harm to the environment and human health. This method is environmentally friendly and contributes to green production.

This invention discloses a method for preparing a cerium dioxide catalyst for ultra-high temperature catalytic water-gas conversion reaction. The method involves first synthesizing cerium dioxide nanoparticles via a hydrothermal method, and then subjecting the nanoparticles to multi-step heat treatment in a gaseous environment to achieve surface modification, resulting in a cerium dioxide catalyst with a large number of exposed coordination unsaturated sites. The catalyst prepared by this method exhibits excellent catalytic performance for water-gas conversion reaction in the ultra-high temperature range above 600℃. Traditional industrial Fe-based catalysts deactivate above 600℃, while the cerium dioxide catalyst prepared by this invention maintains high performance at temperatures above 600℃ and is not easily deactivated. Furthermore, cerium dioxide catalysts are environmentally friendly materials with advantages such as low cost and minimal environmental pollution, showing broad application prospects in industrial water-gas conversion reaction for hydrogen production.

The present invention relates to a sulfur electrode composition for a lithium-sulfur battery, comprising: a cellulose nanofiber binder; and an active material comprising sulfur. Thereby, the sulfur electrode for a lithium-sulfur battery of the present invention maximizes the utilization rate and conversion reaction rate of sulfur in a lithium-sulfur battery even under minimal electrolyte conditions by introducing cellulose nanofibers as a binder, and the distance between the expanded glucose chains formed due to the one-dimensional structure and electrostatic repulsion of the cellulose nanofibers promotes the interaction between the binder and lithium polysulfide (LiPS), and effectively suppresses the formation of aggregates of lithium polysulfide (LiPS). Therefore, a lithium-sulfur battery including such a sulfur electrode maintains a high active material ratio even under minimal electrolyte conditions while increasing the electrochemical conversion reaction rate, thereby improving battery performance and significantly increasing energy density.

The application discloses a hydroconversion method of sulfur-containing naphtha. The method comprises the following steps: mixing the sulfur-containing naphtha with hydrogen and performing hydroconversion reaction through a hydroconversion reaction zone; the reaction effluent enters a separation system to obtain hydrogen-rich gas and a hydroconversion product through separation; the hydroconversion reaction zone is sequentially filled with a hydroconversion catalyst I and a hydroconversion catalyst II along the flow direction; and the volume ratio of the hydroconversion catalyst I to the hydroconversion catalyst II is 1:3-3:1. The method can effectively convert isomeric alkanes in the naphtha into normal alkanes, improve the ethylene raw material quality, and solve the problem of sulfur injection in the ethylene production device.

The application discloses a whole-genome DNA cytosine hydroxymethylation modification single-base precision library construction method, relates to the technical field of genomics, epigenetics and molecular biology, and contains the following steps: 5hmC labeling reaction, click chemistry reaction, sample DNA fragmentation, purification of the fragmentation product through magnetic beads, 5hmC fragmented DNA capture, washing of the capture product, reduction reaction, APOBEC enzyme deamination reaction, purification of the deamination product, double-strand conversion reaction, end repair and 3' end A addition reaction, linker ligation, purification of the ligation product and double sorting, library amplification and library purification. The library construction method integrates low data volume, single-base precision and conventional double-strand library construction kit in one under the premise of ensuring data authenticity, and has the technical advantages of high universality and highly repeatable data.

The application discloses a processing method of sulfur-containing naphtha. The method comprises the following steps: (1) mixing the sulfur-containing naphtha with hydrogen, and passing the mixture through a hydroconversion reaction zone, wherein the hydroconversion reaction zone is filled with at least two hydroconversion catalyst beds, and the mass content of active metals in the downstream catalyst bed is 1-25 percentage points lower than that in the upstream catalyst bed in terms of oxides; (2) carrying out high-pressure separation on the hydroconversion reaction effluent obtained in the step (1), and separating hydrogen-rich gas and liquid phase effluent, wherein the liquid phase effluent enters a separation system, and ethane, propane and n-butane are separated. The method can solve the problem of sulfur injection in an ethylene production device by using hydrogen sulfide-containing hydrogenation products as ethylene raw materials.

The application provides a preparation method of cycloastragenol and relates to the technical field of biology.The preparation method of the cycloastragenol comprises the following steps: preparing a mixed solution of astragaloside, xylosidase and GSM microbial agent, and preparing the cycloastragenol through a conversion reaction.The preparation method can realize 100% conversion of the astragaloside through the synergistic effect of the GSM microbial agent and the xylosidase, and the preparation method is simple and efficient, and the prepared cycloastragenol has high yield and high purity.

This invention discloses a method for producing aromatic hydrocarbons by coupling conversion of carbon dioxide and polyolefin, and belongs to the technical field of conversion and reuse of polyolefin plastics. The catalyst is a dual-function catalyst consisting of a metal, a metal oxide, and a molecular sieve, and the conversion reaction is carried out under the action of the catalyst using carbon dioxide and polyolefin as reaction raw materials. The reaction process not only enables the resource utilization of carbon dioxide, but also enables the recycling of polyolefin plastics, realizing high value-added utilization and producing high value-added aromatic hydrocarbon products. The reaction has very high product yield and product selectivity, with the yield of aromatic hydrocarbons reaching 50-80%, and the proportion of benzene, toluene, and xylene in the aromatic hydrocarbons being 60% or more. Furthermore, the catalyst can be reused after simple regeneration treatment, and it has high applicability as a new technology for the comprehensive utilization of polyolefin waste plastics and the reduction of carbon dioxide emissions.

The application relates to the field of ceramic processing, and particularly discloses a high-entropy carbide composite ceramic and a preparation method thereof. In the application, SiBCN ceramic is used to enter high-entropy ceramic lattice distortion sites under a high-temperature environment, gradually replace B elements and combine with metals, complete a carbonization conversion reaction, and realize a preparation process of high-entropy carbide. The high-entropy carbide prepared through the carbonization conversion has the advantages of low sintering temperature and short production cycle. The method has the characteristics of low synthesis temperature, simple preparation method and short production cycle, and the prepared high-entropy carbide composite ceramic has the characteristics of uniform particle size distribution and low crystallization temperature.

This invention provides Mg4C 60 Applications of Mg4C as a catalyst in lithium-sulfur batteries, and lithium-sulfur batteries containing this catalyst and their assembly methods. 60 When used as a catalyst in lithium-sulfur batteries, it can significantly reduce the activation energy of S-S bond breaking in polysulfides, accelerate the liquid-solid reduction reaction of Li2S4→Li2S, and shorten the residence time of Li2S4 in the electrolyte. On the other hand, it can promote the direct conversion reaction of Li2S6→Li2S, avoid the formation pathway of Li2S4, thereby reducing the accumulation of highly soluble and easily shuttled Li2S4 intermediates in the system, suppressing the shuttle effect, and improving the performance of lithium-sulfur batteries.

This invention relates to the field of novel energy storage materials, specifically to an ultra-high capacity tellurium-based material with a six-electron conversion mechanism and its manganese ion storage application. The material system of this invention includes a tellurium-based active material as the working electrode and an ion transport medium adapted to it; wherein the tellurium-based active material is a composite material of tellurium and carbon-based materials; the ion transport medium is a hydrated eutectic system, including manganese salt, hydrogen bond donor water, and hydrogen bond acceptor succinate. This invention successfully activates the deep six-electron conversion reaction (Te6000) of the tellurium-based material in an aqueous environment. 2‑ ↔Te 4+ This breakthrough overcomes the capacity bottleneck of traditional four-electron reactions. The material system not only exhibits excellent conductivity but also demonstrates ultra-high specific capacity and excellent cycle stability, providing a novel material solution for constructing high-specific-energy storage devices.

This invention belongs to the field of industrial energy conservation and environmental protection technology, specifically relating to a catalytic utilization system and method for carbon monoxide in dry quenching exhaust gas. The system includes an interconnected catalytic conversion device and a flue gas cooling device. The catalytic conversion device includes a catalytic conversion component for the catalytic conversion reaction, a heat storage component for collecting heat, and a heat exchange component for cooling. The heat storage component enables cascaded recovery of waste heat. This invention employs a heat storage and heating method with staged catalytic catalysis, eliminating the need for mixing and diluting the flue gas. It satisfies the catalytic ignition temperature of CO, avoids catalyst sintering and deactivation, and retains the high concentration of CO2 in the exhaust gas. It simultaneously achieves deep CO purification, efficient waste heat recovery, and carbon resource utilization. The system has a compact layout, low energy consumption, and can reduce the exhaust gas temperature to below 70°C, combining environmental and economic benefits.

The present invention belongs to the technical field of genetic engineering. Provided are an enzyme formulation for the catalytic synthesis of scyllo-inositol, and a method for preparing scyllo-inositol. The enzyme formulation has the enzymatic activity of catalyzing the reaction of myo-inositol to form scyllo-inositol, and comprises inositol dehydrogenase and scyllo-inositol dehydrogenase. After mutation, inositol dehydrogenase has a higher enzymatic activity, and scyllo-inositol dehydrogenase has a broader applicable pH range. Further provided is a method for preparing scyllo-inositol, which method comprises: (1) preparing a crude enzyme solution of inositol dehydrogenase and scyllo-inositol dehydrogenase, preparing a myo-inositol solution, and adding the myo-inositol solution to the crude enzyme solution; (2) adjusting a pH value to 7-10, controlling a temperature to 40-50°C, and performing a conversion reaction to obtain conversion solution A; and (3) subjecting conversion solution A to first cooling crystallization and filtration, and collecting a filtrate and a filter cake; adding water and a myo-inositol solid to the filtrate, and repeating step (2) and step (3) until no crystals precipitate; and subjecting the filter cake collected each time to first ethanol washing, second cooling crystallization, filtration, second ethanol washing and drying in sequence, to obtain scyllo-inositol. The method for preparing scyllo-inositol has good conversion performance, shortens the production cycle of scyllo-inositol, and reduces waste liquid generation and environmental pollution.

The application discloses a method for converting sulfur-containing naphtha. The method comprises the following steps: mixing the sulfur-containing naphtha with hydrogen, and then passing the mixture through a hydroconversion reaction zone; and separating a reaction product to obtain hydrogen-rich gas and a hydroconversion product, wherein the sulfur content in the hydroconversion product is 50-200 mg / kg, and the hydroconversion reaction zone is filled with at least two hydroconversion catalyst beds, and the active metal content in the catalysts decreases in sequence along the flow direction. The hydroconversion product containing a certain amount of hydrogen sulfide is used as ethylene raw material, so that the problem of sulfur injection in an ethylene production device can be solved.

This invention provides a simulation method for the generation of organic iodine based on the Kolbe electrolysis reaction, belonging to the field of spent fuel reprocessing technology. This method introduces iodine into the Kolbe electrolysis reaction and compares the intrinsic ability of different forms of iodine to react with alkyl radicals to generate organic iodine. Compared with traditional simulation experiments under irradiation conditions, the method of this invention can conveniently obtain alkyl radicals through electrochemical reactions, eliminates the interference of water radiolysis products in the irradiation environment, and provides a clear understanding of the organic iodine conversion capabilities of different forms of iodine; moreover, it does not require specific irradiation equipment and shielding measures, facilitating real-time control and sampling analysis of the reaction, and has better simplicity and operability.

The application discloses a chemical cycle hydrogen production system and method, which is a circulation system in which an oxygen carrier sequentially and independently participates in reactions in a conversion unit, a hydrogen production unit and an oxidation unit. The conversion unit comprises a conversion reactor which uses methane as bed fluidization air to fluidize the oxygen carrier in the bed and perform a lattice oxygen partial oxidation reaction in a non-complete combustion state to obtain CO and H2 synthesis gas products. The conversion reactor extends downward to a riser section at the bottom. A deep reduction reactor receives the oxygen carrier transported from the riser section of the conversion reactor in a dense phase and performs primary gas stripping using the CO and H2 synthesis gas as fluidization air. H2 produced by the hydrogen production unit is introduced into the bottom of the riser section of the deep reduction reactor as fluidization air to perform secondary gas stripping on the oxygen carrier in the deep reduction reactor. The oxygen carrier is deeply reduced in the process of the two gas strippings and the synthesis gas products in the conversion reactor are prevented from entering the hydrogen production unit.

This invention discloses a method, system, and application of ironmaking that couples carbon capture and in-situ conversion. The method employs a dual-functional composite material for adsorption and catalysis, comprising an adsorbent component and a catalytic component. The adsorbent component is a regenerable CO2 adsorbent, and the catalytic component is a catalyst capable of catalyzing in-situ hydrogenation conversion. The method includes the following steps: capturing carbon from coal gas using a CO2 adsorbent to obtain decarbonized coal gas; regenerating the CO2 adsorbent to release CO2, and simultaneously, under the action of the catalyst, performing in-situ hydrogenation conversion on the released CO2 to obtain CO2 converted gas; mixing the decarbonized coal gas and the CO2 converted gas to form a mixed gas, which is then injected into a metallurgical reactor for smelting. This invention effectively solves the problem of large-scale CO2 consumption by coupling CO2 capture and conversion utilization with the ironmaking system, realizing carbon recycling and hydrocarbon coupling reduction in the ironmaking system, and effectively reducing carbon emissions from the ironmaking system.

The present application relates to coal chemical technology field, disclose a kind of method for preparing synthesis gas by multi-stage self-heating catalytic deoxidation conversion of oxygen-containing coal seam gas, comprising the following steps: step (1), after preheating oxygen-containing coal seam gas is divided into multiple streams;Step (2), first oxygen-containing coal seam gas is mixed with steam first, into the first self-heating catalytic deoxidation conversion reactor and carries out self-heating catalytic deoxidation and methane steam reforming reaction;Step (3), the outlet gas of first self-heating catalytic deoxidation conversion reactor is mixed with second oxygen-containing coal seam gas after entering second self-heating catalytic deoxidation conversion reactor and carries out self-heating catalytic deoxidation and methane steam reforming reaction, in turn;Step (4), the outlet gas of last self-heating catalytic deoxidation conversion reactor is re-entered into pure oxygen conversion reactor or air conversion reactor and carries out conversion reaction.The method of the present application is controllable in reaction temperature, only needs to supplement steam once, steam addition amount is less, heat utilization efficiency is high, energy and investment are saved.

The application belongs to the technical field of analytical testing and substance component detection, and specifically discloses a novel compound identification method based on atlas analysis of a combined instrument, which comprises the following steps: synchronously aligning the chromatographic retention time, ion drift time, mass-to-charge ratio and ion abundance of a sample to be detected to extract a four-dimensional characteristic peak group; based on an addition rule, gathering ion clusters to confirm a single isotopic mass; calculating a mass offset and matching a conversion reaction dictionary to anchor a candidate metabolite; comparing secondary mass spectrum fragments and mapping to a parent fragmentation path to generate a two-dimensional plane structure; based on this, enumerating isomers, constructing a three-dimensional rigid body molecular model and deducing a theoretical collision cross section area; finally, comparing the actually measured and theoretical collision cross section areas, combining the polarity difference of the retention time mapping to perform orthogonal constraint verification, and outputting the target three-dimensional structure of the metabolite. The application realizes the reliability of compound confirmation in a complex sample.