811 results about "Conversion reaction" patented technology

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 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 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 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.

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.

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.

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.

The invention discloses lithium sulfide, a two-step double decomposition preparation method and application of the lithium sulfide in an all-solid-state battery, and belongs to the technical field of solid-state batteries. According to the preparation method, a two-step decomposition synthesis technology is adopted, lithium carbonate and ammonium thiocyanate are used as raw materials, the raw materials are uniformly mixed and then placed in a high-temperature reactor, a step heating sintering procedure is completed in an inert gas atmosphere, and the purpose of fully decomposing and converting the raw materials is achieved by accurately controlling the temperature and the time; after a product is obtained through reaction, the high-purity lithium sulfide material is obtained after the product is cooled to the room temperature. The method for preparing the lithium sulfide is low in raw material cost, simple in reactant formula and free of side reaction in the reaction process, and the finally generated product is few in impurity, high in purity and good in crystallinity.

The invention belongs to the technical field of direct preparation of low-carbon olefin from synthesis gas, and particularly relates to a catalyst and a method for preparing propylene and butylene by direct conversion of synthesis gas. The catalyst comprises a component A and a component B, the component A and the component B are compounded together in a mechanical mixing mode, an active component of the component A is a metal oxide, and the component B is an SAPO-14 molecular sieve or a heteroatom modified SAPO-14 molecular sieve. The synthesis gas is used as a reaction raw material, a conversion reaction is carried out on a fixed bed or a moving bed, the reaction process has very high product yield and selectivity, the selectivity of low-carbon olefin can reach 70%-90%, the selectivity of propylene and butylene can reach 60%-80%, the selectivity of propylene and butylene in low-carbon olefin can reach 75%-95%, and the selectivity of propylene and butylene in low-carbon olefin can reach 70%-90%. The ratio of propylene to butylene is 1.5-3.5, and the byproduct methane selectivity is low (lt; and the method has a good application prospect.

The invention discloses a process for preparing synthesis gas by non-catalytic and catalytic coupling of hydrocarbon-containing raw material gas. The process comprises the following steps: (S1) dividing preheated raw material gas into first raw material gas and second raw material gas; (S2) introducing the first raw material gas, water vapor and preheated oxygen into a non-catalytic reactor, and carrying out a non-catalytic conversion reaction to generate first synthesis gas; (S3) introducing the second raw material gas and supplemented water vapor into a pre-catalytic reactor, and carrying out pre-catalytic conversion reaction to generate second synthesis gas; (S4) introducing the first synthesis gas and the second synthesis gas into a catalytic reactor, and carrying out catalytic conversion reaction to prepare third synthesis gas; and (S5) carrying out heat recovery on the prepared third synthesis gas to obtain the synthesis gas. According to the invention, the non-catalytic conversion reaction and the catalytic conversion reaction are coupled, so that the material consumption is greatly reduced, and meanwhile, heat is provided for the catalytic conversion reaction through the non-catalytic conversion reaction, so that the heat is recovered to a great extent.

The invention provides a method for improving main components in a cobalt nickel hydroxide intermediate product. The lifting method comprises the following steps: step S100, carrying out first activation on cobalt nickel hydroxide intermediate product slurry by adopting an alkaline substance to obtain first activated product slurry; step S200, adjusting the solid content of the first activated product slurry; s300, activating the first activated product slurry for the second time by adopting a reducing agent to obtain second activated product slurry; step S400, adjusting the solid content of the second activated product slurry; and step S500, adding the second activated product slurry into a nickel-cobalt-containing solution for conversion reaction to obtain nickel cobalt hydroxide and a converted solution. According to the method disclosed by the invention, the total content of nickel and cobalt in cobalt nickel hydroxide can be remarkably increased and reaches a level exceeding 50%. The problems that the content of impurities such as magnesium and manganese in the nickel cobalt hydroxide intermediate product is too high, the content of sulfate radicals is too high, and consequently the subsequent refining production cost is increased are solved.

The present disclosure relates to a process and device for preparing a powdery upgraded fuel by means of thermal conversion of organic solid waste. The thermal conversion comprises two modes, i.e., roasting and pyrolysis. The process for preparing a powdery upgraded fuel by means of thermal conversion of organic solid waste comprises a thermal conversion crushing step, a vibrating thermal conversion screening step, a fluidifying thermal conversion sorting step, and a screw lifting ball-milling thermal conversion step. In the present disclosure, thermal conversion, crushing and separation treatment can be performed on an organic solid waste material at the same time, the thermal conversion process and the crushing and separation process are coupled, coordinated and mutually reinforced, and therefore the thermal conversion reaction rate and conversion efficiency of organic solid waste can be significantly improved, and a powdery thermally-converted upgraded fuel is obtained; when the organic solid waste contains a relatively large amount of metal or non-metal inorganic substances, a variety of sorted products including the metal or non-metal inorganic substances can be recovered at the same time; and particularly, the obtained upgraded fuel is in a powdery state, is suitable for being used as a gasification raw material for a powder boiler and / or an entrained-flow bed, and has good value in terms of resource utilization and high-value utilization.

The invention relates to the technical field of catalytic materials, in particular to a catalyst and a preparation method and application thereof. The invention provides a catalyst. The catalyst comprises organosilane modified mesoporous silica and nickel-molybdenum bimetallic loaded in the organosilane modified mesoporous silica. Nickel in the catalyst can promote hydrogen activation and hydrogenation, and molybdenum plays a role in catalytic cracking reaction. On the catalyst, the synergistic effect generated by combination of bimetal and acidic sites is more beneficial to efficient HDO reaction (catalytic hydrodeoxygenation reaction). The result of the embodiment shows that when the conversion rate of the model compound guaiacol is 100%, the highest selectivity of the obtained product naphthenic alcohol can reach 50.1%; when the catalyst is applied to the hydrodeoxygenation conversion reaction process of biomass alcoholysis derivative oil, the yield of naphthenic alcohol is greatly increased, and the relative content is increased from 3.5% to 49.8%.

The invention discloses a production process for preparing potassium sulfate from glauberite by an asymmetric balance method, which is characterized in that two asymmetries are designed, one is that an evaporation system adopts a mode of feeding more cold clear liquid and discharging more salt mother liquid, evaporation is carried out according to a fixed proportion, enough evaporation condensate water can be evaporated in unit time, and the evaporation efficiency is improved; the excessive part is used for digesting water from an external supplementing system; secondly, the secondary conversion reaction is a reaction of a potassium chloride solution and glauberite in an equal proportion, the glauberite containing the glauberite is matched with anhydrous sodium sulphate to produce potassium sulfate, and the core is that the potassium index of a primary conversion reaction system is controlled by using the proportion of the glauberite containing the glauberite, so that the production quantity of the glauberite is adjusted; the potassium sulfate is matched with the evaporation and condensation water amount consumed due to equal-proportion dissolution, so that the overall balance is maintained for production, and meanwhile, the quality of the prepared potassium sulfate meets the quality requirements of agricultural potassium sulfate national standard GB / T 20406-2017 powder crystalline superior products (K2O is greater than or equal to 52%) and first-grade products (K2O is greater than or equal to 50%).

A liquid fuel production system including: a gas-adsorbing / desorbing portion; a heating medium-supplying portion configured to supply, to the gas-adsorbing / desorbing portion, a heating medium for heating the gas-adsorbing / desorbing portion; a liquid fuel-synthesizing portion including a first gas flow path storing a catalyst that advances a conversion reaction from a raw material gas to a liquid fuel, and a second gas flow path through which a temperature-controlling gas that controls a temperature of the first gas flow path is flowed, the liquid fuel-synthesizing portion being configured to flow a first outflow gas out of the first gas flow path, and to flow a second outflow gas out of the second gas flow path; and a heat exchanger configured to perform heat exchange between the first outflow gas and the heating medium to heat the heating medium. The first outflow gas contains a condensable gas.

A method for preparing theasinensin A (TSA) by means of a low-temperature enzyme process. The method comprises using a plant polyphenol oxidase enzyme extract or polyphenol oxidase enzyme formulation as an enzyme source, using epigallocatechin gallate (EGCG) as a substrate, using as a reaction system a buffer solution having a certain pH value, and performing an enzymatic reaction at a low temperature and subsequent steps such as column chromatography, distillation and concentration, liquid phase preparation, and freeze drying, thereby synthesizing TSA in a directional enzymatic manner. The method achieves EGCG enzymatic oxidation at a low temperature and obtains dimeric TSA by means of a conversion reaction, laying a theoretical and practical basis for green, safe, efficient and large-scale industrial production and utilization of TSA.