995 results about "Conversion reaction" patented technology

The present invention relates to a catalyst for ortho-parahydrogen conversion suitable for a wide range of low-temperature conditions and a preparation method thereof. The catalyst is a fiber magnetic catalyst FeMnOx doped with Fe atoms in an orderly manner; the base material of the catalyst is α-MnO2, the α-MnO2 belongs to the tetragonal system, the unit cell parameter is #imgabs0#, the crystal structure is composed of 2×2 octahedral chains with shared edges, the XRD characteristic diffraction peaks are 2θ=12.8°, 18.1°, 25.7°, 37.5°, 49.8°, 56.3°, and the specific surface area measured by the BET test method is 100-150m 2 / g, and transmission electron microscopy shows that its microstructure is a fibrous structure with a diameter of 2 to 5nm and a length of 100nm to 500nm; when the catalyst is used for the ortho-parahydrogen conversion reaction, the ortho-parahydrogen conversion efficiency is more than 95%, and the catalyst life is more than 1400h; the wide range of low temperature conditions is 23K-77K. The coordination of Fe atoms with lattice oxygen in α-MnO2 can effectively avoid the deactivation of the catalyst caused by the change of the valence state of the metal component, thereby enhancing the stability and life of the catalyst, and is suitable for industrial-scale production.

A process and system for upgrading an organic feedstock including providing an organic feedstock and water mixture, feeding the mixture into a high-rate, hydrothermal reactor, wherein the mixture is rapidly heated, subjected to heat, pressure, and turbulent flow, maintaining the heat and pressure of the mixture for a residence time of less than three minutes to cause the organic components of the mixture to undergo conversion reactions resulting in increased yields of distillate fuels, higher-quality kerosene and diesel fuels, and the formation of high octane naphtha compounds. Hydrocarbon products are cooled at a rate sufficient to inhibit additional reaction and recover of process heat, and depressurizing the hydrocarbon products, and separating the hydrocarbon products for further processing. The process and system can include devices to convert olefinic hydrocarbons into paraffinic hydrocarbons and convert olefinic byproduct gas to additional high-octane naphtha and / or heavier hydrocarbons by one of hydrogenation, alkylation, or oligomerization.

The invention provides a method for precipitating nickel and cobalt in a solution containing nickel and cobalt and a cobalt nickel hydroxide product. The method comprises the following steps: step S100, carrying out a seed crystal pretreatment reaction on a nickel-cobalt-containing solution by adopting first nickel-cobalt precipitation underflow to form pretreated nickel-cobalt ore pulp; step S200, adding an alkaline precipitation inducer into the second nickel-cobalt precipitation underflow or the first nickel-cobalt precipitation overflow to carry out alkali conversion reaction to form alkali conversion crystal mush; s300, the pretreated nickel-cobalt ore pulp and alkali conversion crystal mush are continuously introduced into a reactor for a nickel-cobalt precipitation reaction, and nickel-cobalt precipitated ore pulp is obtained; step S400, continuously performing dense separation treatment on the ore pulp subjected to nickel-cobalt precipitation; s500, the third nickel-cobalt precipitation underflow is filtered and washed in sequence, a nickel-cobalt hydroxide product is obtained, and the problems that in the prior art, when nickel and cobalt are precipitated through a nickel-cobalt-containing solution, MHP is small in particle size and not prone to sedimentation, the water content of a filter cake is high, or the precipitation rate is poor, and the magnesium content is high before technical improvement are solved.

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 belongs to the field of biological pharmacy and biotransformation, and particularly relates to a tagatose-4-epimerase mutant and application thereof. The tagatose-4-epimerase mutant disclosed by the invention is obtained by carrying out single mutation or combined mutation on an amino acid residue at a specific position of an amino acid sequence as shown in SEQ ID NO.1. Compared with wild type tagatose-4-epimerase, the mutant has the advantage that the catalytic activity is improved when the D-tagatose is prepared through conversion. The obtained tagatose-4-epimerase mutant has the advantages of being mild in reaction condition, green, environmentally friendly, single in product and easy to separate and purify, and the production cost is greatly reduced.

The invention provides a precipitation method of a heavy metal solution. Cations in the heavy metal solution comprise nickel ions, cobalt ions, copper ions, zinc ions and manganese ions, and the precipitation method comprises the following steps: step S100, carrying out a manganese conversion reaction on an alkaline substance by adopting a solution containing manganese ions to obtain a converted manganese precipitate; s200, a stabilizing agent is adopted for carrying out a stabilizing reaction on the converted manganese precipitate, and a stable manganese precipitate is obtained; step S300, adding the stable manganese precipitate into a heavy metal solution for precipitation reaction to obtain precipitate slurry; step S400, continuously carrying out solid-liquid separation on the precipitate slurry to obtain a heavy metal precipitate and a manganese-containing solution; and S500, raw materials including the manganese-containing solution, an oxidizing agent and alkali liquor are subjected to an oxidation precipitation reaction, and a post-precipitation solution and a manganese product are obtained. The method solves the problems of poor sedimentation and filtration performance of a precipitation product, high moisture content of the precipitation product and low precipitation efficiency when heavy metals are precipitated in the heavy metal solution.

The invention belongs to the field of biological fermentation synthetic medicines, and particularly relates to tocopherol glucoside and a preparation process thereof. The synthesis method comprises the following steps: (1) preparing an enzyme catalyst; (2) carrying out enzymatic conversion reaction; (3) purifying ion resin; (4) removing impurities; the synthesis process provided by the invention is simple in route and strong in operability, the prepared tocopherol glucoside is high in purity, the total yield of the product is greater than 30%, and the purity is greater than 95.0%.

The invention discloses a method for preparing gamma-aminobutyric acid through whole-cell catalysis, and relates to the technical field of gamma-aminobutyric acid preparation, and the method comprises the following steps: culture medium preparation, microbial culture, thallus preparation, catalytic conversion, reaction liquid pretreatment, vacuum concentration, crystallization purification and drying. Concentration treatment is carried out in a gradient temperature setting mode in the vacuum concentration step, on one hand, low energy consumption is facilitated, on the other hand, the situation that a small amount of impurities in a sample are changed due to the temperature is prevented, the solubility of aminobutyric acid is reduced after cooling, crystals are separated out more easily, and the quality of the product is improved. In addition, through temperature gradient setting in the microbial culture step and temperature reduction after induction, correct folding of protease can be promoted, then the activity of unit protease is increased, the reaction effect is improved, and therefore the purity and the finished product yield of gamma-aminobutyric acid are improved.

The invention discloses a multi-stage carbon dioxide capture and utilization method and device. CO2-containing high-temperature flue gas enters an adsorption reactor and passes through the adsorption reactor filled with a bifunctional catalyst, and CO2 in the flue gas is adsorbed and captured by a catalytic material in a catalyst bed layer; decarburized gas comes out of the adsorption reactor, exchanges heat with process gas from the conversion reactor in a heat exchanger, and enters the next stage of adsorption reactor after heat exchange, when the adsorption reactor reaches the saturated adsorption capacity of an adsorbent, CO2-containing high-temperature flue gas is switched to enter the first stage of conversion reactor, at the moment, reducing gas enters the adsorption reactor, and the CO2-containing high-temperature flue gas enters the second stage of conversion reactor; and the converted synthesis gas is sent out of the device. By means of the technical process, the energy utilization rate can be fully increased, the emission reduction cost can be effectively reduced, high energy consumption caused by trapping cooling / conversion heating can be avoided, and the problems of high cost for purification and transportation after CO2 capture and potential safety hazards caused by burying are solved.

The invention relates to the technical field of photocatalysis, in particular to a defect-state titanium dioxide supported catalyst, a preparation method and application of the defect-state titanium dioxide supported catalyst in a reaction for co-converting methane and carbon dioxide. The defect-state titanium dioxide supported catalyst comprises a carrier and metal Au supported on the surface of the carrier; the carrier is a defect-state titanium dioxide nanosheet with oxygen vacancies. According to the invention, the defect-state titanium dioxide nanosheet is used as a carrier, and after metal particles (Au) are loaded, the metal particles are used as capture centers of photo-induced electrons to promote spatial separation of photo-induced electron-hole pairs. In addition, the formed metal-carrier interface site effectively enhances the adsorption and activation of CH4 and CO2 by the photocatalyst. Moreover, the loaded high-electronegativity metal Au can also be used as a coupling site of methyl, so that high-yield C2H6 is obtained, and meanwhile, a corresponding CO product is obtained.

The invention discloses a method for converting niobium minerals in niobium rough concentrate into pyrochlore. The method comprises the following steps: (1) mixing the niobium rough concentrate with a modifier, a fluorine-containing reagent, a reducing agent and a binder, and carrying out compression molding; and (2) roasting the mixed blank for a set time, preserving heat, and quenching to obtain pyrochlore type rough concentrate. The method comprises the following steps: (1) carrying out magnetic separation on pyrochlore type rough concentrate; (2) performing heating and acid leaching on the magnetic separation tailings; and (3) carrying out flotation to obtain niobium concentrate. According to the method, iron components in the rough concentrate are reduced into magnetic iron minerals, niobium minerals are converted into non-magnetic pyrochlore, follow-up niobium-iron separation is facilitated, and the grade of niobium in the niobium concentrate obtained through production can be effectively improved; and the method is high in adaptability to niobium rough concentrate, is also applicable to alkaline or acidic niobium rough concentrate, is relatively small in gangue mineral change and low in conversion reaction temperature, and has the advantages of energy conservation and emission reduction compared with other regulation and control processes.

The invention relates to an aqueous zinc-iodine battery electrolyte containing a phenolic additive, and a preparation method and application thereof, and belongs to the technical field of aqueous zinc-iodine batteries. The invention aims to solve the technical problems of serious multi-iodide shuttling and negative electrode by-products of the existing aqueous zinc-iodine battery. The preparation method of the aqueous zinc-iodine battery electrolyte containing the phenolic additive comprises the following steps: dissolving zinc salt and the phenolic additive in deionized water, and fully stirring and mixing to obtain the aqueous zinc-iodine battery electrolyte containing the phenolic additive. The phenolic additive used in the application can accelerate conversion from I3-to I-, accelerate iodine conversion reaction kinetics and reduce generation of polyiodide, so that shuttling of the polyiodide is effectively inhibited, a phenolic additive monomer is adsorbed on the surface of a zinc negative electrode, contact between Zn < 2 + > and water molecules is reduced, and generation of zinc negative electrode by-products is inhibited; the zinc-iodine battery also has the advantages of being easy to manufacture and low in cost.

The present invention belongs to the field of material preparation, and discloses a preparation method and application of a composite material of Pd, cerium oxide and silicon dioxide with a controllable hierarchical catalytic structure. Cerium oxide rich in oxygen vacancies is used as a carrier, and Pd species are loaded by impregnation, and then dispersed on the surface of acidic silicon dioxide with a high specific surface area. Finally, a Pd / CeO2 / SiO2 material with a controllable hierarchical catalytic structure is prepared by high-temperature calcination and reduction, and is used to catalyze the hydrogenation conversion reaction of furfural. The preparation method of the present invention is simple, green and environmentally friendly, highly active, stable, cheap and easy to obtain, and can efficiently catalyze the hydrogenation conversion of furfural, and has good industrial application prospects.

The invention relates to the field of catalysts, and discloses a Recry-Beta molecular sieve, a catalyst, a preparation method of the Recry-Beta molecular sieve and the catalyst and application of the Recry-Beta molecular sieve and the catalyst in a hydrocarbon conversion reaction, and the preparation method of the molecular sieve comprises the following steps: carrying out acid pickling dealumination treatment on an H-Beta molecular sieve to obtain a Si-Beta molecular sieve; the method comprises the following steps: mixing a Si-Beta molecular sieve, a template agent and water, and crystallizing to obtain a Recry-Beta molecular sieve; the particle size of the H-Beta molecular sieve is less than 90 nm, and the molar weight ratio of the template agent to the Si-Beta molecular sieve based on SiO2 is 0.08-0.25. The molecular sieve prepared by the invention can promote the interaction of Zr and molecular sieve framework elements, is suitable for the reaction of preparing 1, 3-butadiene from ethanol-acetaldehyde, shows excellent catalytic performance, and obviously improves the conversion rate of raw materials, the selectivity of 1, 3-butadiene and the stable operation time.

A method is provided for synthesizing bio-based LPG from renewable sources via a bio-based synthetic gas feedstock, in a dual-stage reaction system comprising an oxygenate synthesis reaction zone and an oxygenate conversion reaction zone that are configured for producing and converting a methanol intermediate for reduced CO2 selectivity. The method includes recovering LPG from either the full reaction zone effluent or from a purge stream separated from the full reaction zone effluent for LPG recovery.

The invention belongs to the technical field of leguminous plants, and particularly discloses a soybean stem protoplast preparation and transformation method, which specifically comprises the steps of soybean aseptic seedling culture, soybean stem protoplast preparation and protoplast transformation. According to the method, the protoplast is prepared from the stem part of the first internode of the soybean, the formula of an enzyme solution is optimized, the protoplast cleaned and collected by W5buffer is utilized for conversion, and PEG instantaneous conversion reaction conditions are utilized, so that the yield and the conversion rate of the soybean protoplast are improved, and the method is more beneficial to identifying the soybean gene function.

Disclosed herein are methods, compositions, and kits related to the identification and / or quantification of target molecules. Furthermore, the disclosure relates to compositions, kits, and methods for detecting and quantifying molecular targets, and especially for detecting and quantifying DNA and RNA The apparatuses and methods. may find use in a variety of applications including prenatal testing detection of pathogens and screening of cancer.

The invention discloses a calcium-based carbon capture-conversion integrated method based on NaAlO2 stable catalysis, and relates to the technical field of carbon dioxide capture and conversion, the specific method comprises the following steps: CaO and NaAlO2 are introduced into a carbonation reactor, CO2-containing flue gas is absorbed to generate CaCO3, NaAlO2 plays a role in inhibiting CaO sintering, so that the carbonation reaction is more stable; then the generated CaCO3 and NaAlO2 are transferred into a conversion reactor, charcoal is added for an in-situ conversion reaction, high-concentration CO gas and CaO are obtained, NaAlO2 serves as a catalyst, and charcoal serves as a reducing agent; and the generated CaO material enters the carbonation reactor again for cyclic utilization. According to the method, CO2 in the flue gas is converted into CO in situ, and emission reduction and utilization of CO2 are promoted.

A method is provided for synthesizing bio-based LPG from renewable sources via a bio-based synthetic gas feedstock, in a dual-stage reaction system comprising an oxygenate synthesis reaction zone and an oxygenate conversion reaction zone that are configured for producing and converting a methanol intermediate for reduced CO2 selectivity. The method includes recovering LPG from either the full reaction zone effluent or from a purge stream separated from the full reaction zone effluent for LPG recovery.

The invention belongs to the technical field of catalytic chemistry, and particularly relates to a method for enhancing photoelectric composite catalytic reaction efficiency through self-adaptive multi-field coupling. Specifically, firstly, a closed columnar reactor composed of an LED array, a reflection / lens system, a copper-nickel alloy cathode, a Ru-doped PbO2 anode, a Ti5O7 / Ti3O4 composite photocatalytic parallel-connection multi-tube plate and the like is built, a distributed silicon photodiode and a quantum dot fluorescent probe sensor are installed, a machine learning algorithm is utilized, and according to the reactant concentration and the by-product generation condition, the quantum dot fluorescent probe sensor and the quantum dot fluorescent probe sensor are analyzed. Light field conditions (wavelength, intensity and distribution) used by photocatalysis, electric field conditions (current, voltage and power line distribution) used by electrocatalysis and flow field conditions (flow velocity, flow rate and distribution) are dynamically adjusted to optimize the chemical reaction rate, and an AI model is combined to predict an optimal multi-field coupling setting scheme, so that the efficiency is improved, the energy consumption is reduced, and the cost is reduced. Meanwhile, the effect of enhancing the catalytic conversion reaction is achieved.

To provide a control method of gypsum conversion reaction and a manufacturing method of calcium carbonate having high versatility to be applicable to a variety of materials and capable of corresponding by minor and easy work.SOLUTION: In a gypsum conversion reaction to obtain calcium carbonate by allowing a solution A containing at least one kind of an alkali metal salt A selected from an alkali metal carbonate salt and an alkali metal hydrogen carbonate salt to be contact with a gypsum-containing material, the control method of gypsum conversion reaction and a manufacturing method of calcium carbonate are characterized by that one condition selected from a pH of a reaction liquid of the solution A and the gypsum containing material and at least one concentration selected from a carbonate ion concentration, a hydrogen carbonate ion concentration, and a calcium ion concentration of the reaction liquid are monitored to determine an end point of the reaction.SELECTED DRAWING: None

The invention relates to a method for preparing low-carbon olefin, which comprises the following steps: contacting an olefin-rich raw material with a thermal regeneration catalyst, and carrying out a first catalytic conversion reaction in a dense-phase fluidized bed layer of a first reactor provided with an instant energy supplement system, the reacted material flow is rapidly cooled through a cooling area, close to the upper part, in the first reactor, so that the reacted material flow is cooled to a target temperature of 450-530 DEG C and then is sent out of the first reactor. According to the method, heat is immediately supplemented for the dense-phase fluidized bed layer, so that the olefin-rich raw material is subjected to catalytic cracking reaction within a proper reaction temperature range, the influence caused by overlarge temperature drop in the reaction process is reduced, and the light raw material is promoted to be subjected to single-molecule cracking reaction; and the yield and the selectivity of low-carbon olefins with high added value, such as ethylene, in the obtained product are improved.

A residual oil conversion process method and a reaction system belong to the field of oil refining processing, and the process method comprises the following steps: mixing a heavy inferior residual oil raw material with a dispersed molybdenum-containing catalyst and a partially circulated heavy fraction cracking product; after heat exchange and temperature rise, pretreatment is conducted through a 10-30 KHz ultrasonic device; after preheating, entering a slurry bed hydrogenation reactor, and carrying out a hydro-conversion reaction in a hydrogen atmosphere under the conditions of 380-500 DEG C and 5-18 MPa; after subsequent processes and equipment separation, the heavy liquid hydrocarbon part enters a catalytic cracking device and is subjected to a contact reaction with a residual oil cracking catalyst containing aluminum extraction and silicon supplement Y zeolite under the conditions that the temperature is 500-540 DEG C and the catalyst-oil ratio is 5-15; fractionating the product in a fractionating tower; the reaction system comprises an ultrasonic pretreatment device, a slurry bed reactor, a catalytic cracking device, a product fractionating tower and heat exchange, separation and circulation equipment. According to the method, the conversion efficiency and process stability of the heavy inferior residual oil raw material are improved, the yield of light fraction gasoline is increased, the energy consumption is reduced, and the method has good economical efficiency and practicability.

The invention belongs to the technical field of percarbamide preparation, and particularly relates to a method and a device for synthesizing percarbamide through electrochemical in-situ extraction of urea in urine. Comprising the following steps: by taking a carbon-based catalyst as a working electrode, a metal active material as an anode and concentrated urine as an electrolyte solution, continuously introducing oxygen into the electrolyte solution, carrying out electrochemical in-situ extraction synthesis under constant voltage, and combining urea molecules with an oxidation intermediate adsorbed on the surface of the carbon-based catalyst, so as to obtain a urea compound; the percarbamide is generated through protonation, and urea in the urine is converted into the percarbamide. On the basis of an electrochemical technology, urea in urine is converted into percarbamide in situ, the conversion process is based on ingenious combination of an electrochemical oxygen reduction reaction and a urea conversion reaction, efficient combination of urea and * OOH is achieved, high-purity solid percarbamide is generated, efficient separation and conversion of urea are achieved under the condition of low energy consumption, and the method is suitable for industrial production. The complex operation of the traditional process is avoided.

The invention discloses a method for preparing artificial bear gall powder through double enzymes, the artificial bear gall powder and application of the method, and belongs to the technical field of biology. The method comprises the following steps: respectively immobilizing two enzymes, and filling the two immobilized enzymes into a column or a reactor according to a ratio. The method can reasonably and effectively control the proportion of the amount of two enzymes participating in the reaction, so that the enzymatic reaction is effectively controlled, and the stability and consistency of the batch-to-batch conversion reaction are ensured. And after the enzymatic reaction is finished, the immobilized enzyme can be recycled in manners of centrifugation, filtration, magnetic separation and the like and is fixed according to the enzymatic reaction requirement, so that the immobilized enzyme can be recycled for multiple times, the use amount of the enzyme is saved, and the use efficiency of the enzyme is improved. The method provided by the invention is strong in operability, good in repeatability and easy in linear amplification, the ratio of TUDCA to TCDCA in the obtained product can reach 1.33 or above, and the method is suitable for industrial production of artificial bear gall powder.

The invention relates to preparation of a ZnCu-MOF dissimilar metal photocatalyst and application of the ZnCu-MOF dissimilar metal photocatalyst in the field of photocatalytic organic conversion. The technical field includes but is not limited to the fields of catalytic chemistry, material science, environmental engineering, green chemistry and the like. According to the invention, a carboxylic acid derivative and an adenine derivative are used as ligands, a zinc salt and a copper salt are used as dissimilar metal sources, and ZnCu-MOF is obtained by a one-pot method. Under the irradiation of blue light, the photocatalyst is applied to conversion of benzimidazole and derivatives thereof as a photocatalyst, the universality range of a substrate is wide, and the photocatalytic conversion yield of the photocatalyst reaches up to 90%. And the prepared ZnCu-MOF material shows an excellent photocatalytic conversion capability. Through the technology provided by the invention, the efficiency and selectivity of photocatalytic organic conversion reaction can be improved, and the development of sustainable chemical reaction is promoted.

The invention belongs to the technical field of sulfur recovery, and particularly relates to a sulfur recovery process of acid gas, equipment of a sulfur production unit comprises a combustion furnace, a waste heat boiler, a first-stage condenser, a gas flow mixer, a first-stage conversion reactor, a second-stage condenser, a first reheater, a second-stage conversion reactor and a third-stage condenser along a process gas flow direction; the temperature of the process airflow at the outlet of the first-stage condenser is controlled to be 150-170 DEG C; a low-temperature oxidation reactor filled with a low-temperature oxidation catalyst is arranged between the airflow mixer and the first-stage conversion reactor, or a low-temperature oxidation catalyst layer is arranged at an airflow inlet reaction section of a catalyst bed layer of the first-stage conversion reactor; the process airflow discharged by the first-stage condenser is uniformly mixed with air or oxygen-enriched air in an airflow mixer, the mixture is treated by a low-temperature oxidation reactor or a low-temperature oxidation catalyst layer, and the temperature of the airflow is increased to 210-260 DEG C; in the process, the control of the combustion furnace and the first-stage conversion reactor is simplified, and the operation condition and the operation effect of the sulfur production unit are easier to guarantee.

The invention discloses a preparation method and application of a sulfur-doped metal monatomic loaded porous carbon material. Metal ions and sulfonic acid groups are utilized to form stable coordination bonds, the stable coordination bonds are confined in a zeolite imidazole-8 three-dimensional network porous structure, and the sulfur-doped metal monatomic loaded porous carbon material is obtained through pyrolysis. The material is in a dodecahedron shape, the particle size is 100-1000 nm, and the mass percent of metal monatomic is 0.1%-10%. In addition, the electronic structure of the active site of the catalyst is adjusted through sulfur doping, the monatomic adsorption and catalysis capability is improved, polysulfide shuttling is relieved, the electrode conversion reaction kinetics is improved, and the high-performance lithium-sulfur battery is achieved.

Electrochemical systems and methods for removing and recovering phosphorus in the form of phosphate from aqueous solutions are provided. Phosphate radical removal is performed in an electrochemical cell having an electrode containing bismuth (Bi), zinc (Zn), copper (Cu), iron (Fe), or an oxide thereof. During the removal of phosphate radicals from an aqueous solution, the metal (Bi, Zn, Cu or Fe) and / or metal oxide of the electrode is converted into its corresponding metal phosphate within the electrode by a reversible conversion reaction. The phosphate stored in the electrode during the removal step is subsequently released into the recovery solution by electrochemical reduction of the metal phosphate to a metal.

A novel synthetic crystalline molecular sieve material called boron SSZ-121 is provided. Boron SSZ-121 can be synthesized using 1,3-bis(1-adamantyl)imidazolium cation as a structure directing agent. Boron SSZ-121 can be used in organic compound conversion reactions and / or sorption processes.