31 results about "Combination reaction" patented technology

The present application discloses a method for treating and resourcefully recycling electroplating cyanide copper wastewater, belonging to the technical field of electroplating wastewater treatment. In this application, the cyanide copper wastewater is adjusted with strong base, and a ferrous sulfate solution is added to the cyanide copper wastewater after strong base adjustment for a combination reaction; the cyanide copper wastewater after the combination reaction is adjusted with acid and subjected to a Prussian blue reaction; a coagulant aid is added to the solution after the Prussian blue reaction, and solid-liquid filtration separation is carried out on it to obtain iron cyanide sludge and preliminarily precipitated cyanide-removing wastewater; the preliminarily precipitated cyanide-removing wastewater is adjusted with weak base, hydrogen peroxide is added to the preliminarily precipitated cyanide-removing wastewater after weak base adjustment, and the copper in the preliminarily precipitated cyanide-removing wastewater after weak base adjustment is used as a catalyst for an oxidation reaction to remove the remaining cyanide-containing pollutants; after the oxidation reaction is completed, lime is added for flocculation precipitation to obtain copper sludge, thus realizing a one-step process flow, converting copper cyanide compounds into resources that can be recycled, and improving the resource utilization rate.

The application discloses a heavy metal removal method and system based on shunt adjustment processing, which comprises the following steps: setting a pH critical value, screening a heavy metal sample to be treated based on the pH critical value; setting a pH adjustment value, a precipitation duration and a product shunt ratio; performing primary cycle precipitation treatment on the screened heavy metal sample to be treated based on the pH adjustment value, the precipitation duration and the product shunt ratio to obtain a primary purification product; setting a flow speed threshold value and a space flow speed threshold value, performing secondary filtration treatment on the primary purification product based on the flow speed threshold value and the space flow speed threshold value to obtain a heavy metal removal finished product; the application can process heavy metal samples in multiple stages, flocculation and precipitation are treated through primary processing shunt cycle processing, reciprocal combination reactions are performed on the flocculation and precipitation, the concentration of the final precipitation product is improved, liquid products after solid-liquid separation are subjected to quartz sand filtration and heavy metal adsorption through secondary processing, and the heavy metal content of the products is strictly controlled.

The invention provides a preparation method and application of perfluorosulfonate. The structural formula of perfluoroether sulfonate is CF2 = CFOCF2CF2SO3M, and M = Li, Na, K or Ca; the preparation method comprises the following steps: adding alkoxide and a hydrofluoroether solvent into a cyclic compound as shown in a formula I in # imgabs0 # to obtain a reaction solution, and heating the reaction solution to obtain CF2 = CFOCF2CF2SO3M. According to the preparation method of the perfluorosulfonate, provided by the invention, the selectivity of the alkoxide and cyclic combination reaction is improved, so that the generation of byproducts is reduced, and the reaction yield is improved.

The invention discloses a method for synthesizing dimethyl carbonate from carbon dioxide and dimethyl ether. The method comprises the following steps: under the action of a catalyst, carbon dioxide and dimethyl ether are mixed for a combination reaction, and dimethyl carbonate is obtained; wherein in the catalyst, an active component is one of CuO, ZnO or a ZnO-CuO compound. According to the method, no by-product is generated, the reaction condition is mild, and the activity of the catalyst is remarkably improved.

The invention discloses a preparation method of a special high-quality LaCoO3-delta single crystal with a magnetic transition property. The preparation method comprises the following steps: performing dewatering sintering on La2O3 powder; putting the pretreated La2O3 powder and Co3O4 powder into a mortar according to a combination reaction ratio, and uniformly grinding; the powder is poured into a customized stainless steel mold and pressed into a sheet shape under the pressure of 1.4 T; placing the flaky sample in a crucible boat, and sintering in a high-temperature furnace at a set temperature of 1050 DEG C for 50 hours; preparing a precursor charge bar, namely uniformly grinding the pressed sample powder which is sintered and cooled to room temperature, putting the pressed sample powder into a latex mold, and carrying out compression molding under high pressure of an isostatic press; sintering the prepared precursor charge bar in a high-temperature furnace to form a polycrystalline charge bar; placing the polycrystal bar in a high-precision optical floating zone method single crystal furnace for single crystal growth; and the bright, glossy and high-quality LaCoO3-delta single crystal is successfully grown by adopting an optical floating zone method.

The invention belongs to the field of special alloy smelting, and relates to an alloy smelting process for applying light elements in a distributed manner, which comprises the following steps of: filling light beneficial elements into a feeding tank made of W / Mo heavy metal elements (which has the characteristics that the overall density is 20% higher than the density of a target alloy, the thickness of a tank cover is 50-80% of the thickness of a tank body and the like); by utilizing the characteristic that the feeding tank can sink to the bottom in the molten steel, light beneficial elements in the feeding tank are conveyed to the bottom of the molten steel; after the tank cover is firstly melted, beneficial elements are slowly released, floated and distributed to be applied, and are subjected to combination reaction with harmful elements in the whole-area molten steel so as to remove the harmful elements; and meanwhile, the uniformity is guaranteed through continuous stirring. The problems that in the prior art, beneficial elements are prone to oxidation burning loss, difficult to settle to all areas and low in utilization rate are solved, the removal rate of harmful elements is larger than or equal to 80%, chemical components are uniform, and good metallurgical quality can be obtained. And the method can adapt to existing smelting equipment and is suitable for smelting of special alloy containing W / Mo.

The application discloses a preparation method and application of a niobium tri-aluminum superconducting wire doped with zinc iodide, and relates to the technical field of superconducting materials.In the preparation process, zinc iodide is doped into Nb powder and aluminum powder, a tubular furnace is heated, the zinc iodide is decomposed into Zn and I at about 1150 DEG C, a chemical reaction occurs between I and Nb at about 1150 DEG C, and the decomposition reaction occurs to form Nb while the chemical reaction occurs, the purpose of refining Nb is achieved through the decomposition reaction, the particle size of Nb reacting with Al is reduced, and then the reaction between Nb and Al is more sufficient, in the subsequent RHQ treatment process, a more pure Nb3Al superconducting phase in a stoichiometric ratio of 76:24 is generated, and the smaller Zn particle size can be used as a nano magnetic flux pinning center, so that the superconducting performance of the prepared niobium tri-aluminum superconducting wire is improved, and the niobium tri-aluminum superconducting wire doped with zinc iodide with excellent superconducting performance is obtained.

The present disclosure provides a method of manufacturing a semiconductor structure and a semiconductor structure. The method of manufacturing the semiconductor structure includes: providing an initial structure, where the initial structure includes a laminated structure and a plurality of capacitor holes formed in the laminated structure, and a bottom electrode is formed in each of the capacitor holes; forming a hard mask layer, where the hard mask layer covers a top surface of the initial structure; and partially etching the hard mask layer through an etching gas, to form a plurality of first opening, where the etching gas includes a first gas, and the first gas includes a nitrogen atomic-containing and / or hydrogen atomic-containing gas, to avoid a combination reaction between the first gas and a material of the bottom electrode.

The invention discloses diamond reinforced alumina slurry suitable for DLP printing and a preparation method thereof.The slurry is grafted with modified diamond particles through a coupling agent and a polymer, polar groups such as hydroxyl groups and epoxy groups are introduced to the surfaces of the diamond particles through hydrolysis and combination reactions, and the interface bonding force with alumina particles is enhanced; the problem of interfacial compatibility of diamond particles and aluminum oxide is solved, uniform dispersion of the particles and resin is ensured by adopting a three-step composite dispersion process, namely a ball milling-vacuum stirring composite dispersion process, the overall uniformity of the diamond-enhanced aluminum oxide slurry is ensured by adopting a vacuum homogenizer, and the obtained slurry is moderate in viscosity, high in light curing speed and high in strength. The printed and formed ceramic part has excellent mechanical property and wear resistance after being sintered, and is suitable for rapid manufacturing of high-precision complex ceramic parts.

The application provides a carbon-supported platinum-nickel catalyst, a preparation method and application thereof. The preparation method comprises the following steps: obtaining a nickel source through a double decomposition reaction of a first ammonium salt and a smelting nickel sulfate salt; obtaining activated carbon black through plasma treatment of carbon powder; obtaining a precursor product through mixing and contacting of the nickel source, the activated carbon black, a platinum source, a second ammonium salt, a complexing agent and a first reducing agent and through a combination reaction; and obtaining the carbon-supported platinum-nickel catalyst through calcination treatment of the precursor product and a second reducing agent. The application adopts a double decomposition reaction of a smelting nickel sulfate salt and an ammonium salt to prepare a high-purity nickel source, and adopts plasma to modify a carbon carrier, so that the controllable optimization of oxygen / nitrogen-containing functional groups and pore structures on the surface of the carbon carrier is realized, the interaction between the carrier and the active component is enhanced, and the obtained carbon-supported platinum-nickel catalyst has superior pore size structure and good catalytic activity.

The utility model discloses a device for preparing furfuryl alcohol through furfural hydrogenation, which relates to the technical field of furfuryl alcohol production and comprises a reaction kettle and a discharge port, a drainage tube is arranged at the top of the reaction kettle, the other end of the drainage tube is connected with a collecting tank, a buffer tank is arranged on the outer side of the collecting tank, and the collecting tank is connected with the buffer tank through a connecting tube. A circulating air pipe is arranged at the top of the buffer tank, a system circulating pump is arranged on the outer side of the circulating air pipe, one end, penetrating through the system circulating pump, of the circulating air pipe is located in the discharging port, and a one-way valve is further arranged on the circulating air pipe. According to the device for preparing furfuryl alcohol through furfural hydrogenation, after the pressure in the reaction kettle reaches a certain value, the system circulating pump is started, hydrogen in the collecting tank collected through the connecting pipe in the buffer tank is pumped out through the circulating gas pipe and then fed into the reaction kettle for internal circulation, and hydrogen needed in hydrogenation reaction is recycled in the device, so that the production cost is reduced, and the production efficiency is improved. Therefore, the hydrogenation reaction is stably operated, and resources are saved.

The application provides a method for preparing 6N selenium from 2N selenium, and belongs to the field of high-purity metal preparation.The method comprises the following steps: oxidizing and roasting 2N selenium to obtain selenium dioxide vapor; mixing the selenium dioxide vapor with water to perform a combination reaction to obtain a selenite solution; mixing the selenite solution with a reducing agent to perform a reduction reaction to obtain 3N and / or 4N selenium; melting the 3N and / or 4N selenium, and then immersing a crystallizer into the obtained melt to perform rotary crystallization to obtain 6N selenium.The application roasts selenium with oxygen to generate selenium dioxide to remove high-boiling impurities; the selenium is enriched by using the property that selenium dioxide is easily soluble in water, the impurities (such as selenium dioxide) that are difficult to dissolve in water are removed to realize the purification of selenium; the 3N and / or 4N selenium is further purified by rotary crystallization to realize the further purification of selenium.

The application discloses a genetic element for enhancing lactic acid metabolic flux of actinomycetes, and belongs to the field of synthetic biology and microbial metabolic engineering. sucC The application successfully constructs a single expression element and a co-expression element by cloning genes from Streptomyces coelicolor sucD , and verifies that the SucC protein and the SucD protein both have lactic acid coenzyme A synthetase activity through in-vitro protein purification and enzyme activity determination, and the enzyme activity of a protein complex (SucC-SucD, SucCD) expressed by the co-expression element is significantly higher than that of the single protein, indicating that the two proteins have a synergistic effect; the genetic element can efficiently catalyze the combination reaction of lactic acid and coenzyme A in vitro, accelerates the lactic acid metabolic speed, provides a core genetic element for the modification of the lactic acid metabolic pathway of actinomycetes, enriches a synthetic biology tool library, and has important industrial application prospects and academic value.

The invention provides a root canal temperature-sensitive EDTA (Ethylene Diamine Tetraacetic Acid) lubricating gel and a preparation method thereof, and belongs to the technical field of gel. Comprising the following raw materials in parts by weight: 10-15 parts of modified chitosan, 8-12 parts of poloxamer 407, 5-8 parts of propylene glycol, 3-7 parts of ethanol, 2-5 parts of EDTA (Ethylene Diamine Tetraacetic Acid) disodium, 3-5 parts of a Tris-HCl solution and 100-120 parts of deionized water. The prepared temperature-sensitive EDTA lubricating gel for the root canal can lubricate the root canal and protect instruments, is easy to operate and beneficial to expanding the canal, can prevent steps from forming or laterally penetrating, softens the wall of the root canal through decalcification under the chelation effect on calcium ions, enables calcified obstructions to be easily removed, is good in antibacterial activity, removes ionized substances through a combination reaction, and has a good antibacterial effect on the wall of the root canal. And a root canal wall stain layer is efficiently removed.

The invention belongs to the field of organic synthesis, and particularly relates to a synthesis method of diaryl compounds containing silicon atoms. Toluene as shown in a formula 1a, iodobenzene as shown in a formula 2a and vinyl silane as shown in a formula 3 are mixed to react in the presence of a catalytic amount of PdCl2 (dppf), phosphorus ligand 4, 6-di (diphenylphosphine) phenazine and alkali metals LiN (SiMe3) 2 and CsF, and the diaryl compound containing silicon atoms as shown in a formula 4 is synthesized through the reaction. According to the invention, the combination reaction of toluene, iodobenzene and vinyl silane is realized by adopting a catalytic amount of PdCl2 (dppf), and the palladium catalyst shows obvious catalytic performance.

The invention provides isocyanate modified low-molecular-weight polyphenyl ether as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. According to the invention, unsaturated isocyanate is used for carrying out an end-capping reaction on low-molecular-weight polyphenyl ether to obtain functionalized low-molecular-weight polyphenyl ether, the reaction is a combination reaction, and compared with a traditional modification strategy of low-molecular-weight polyphenyl ether, the reaction system is simpler, small-molecular products are not generated, and the conversion degree is higher. According to the invention, high-purity modified low-molecular-weight polyphenyl ether can be obtained and has excellent reactivity, dissolvability, electrical insulativity and heat resistance.

The invention provides a carbon-supported platinum-nickel catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: performing double decomposition reaction on first ammonium salt and smelting nickel sulfate salt to obtain a nickel source; performing plasma treatment on the carbon powder to obtain activated carbon black; a nickel source, the activated carbon black, a platinum source, a second ammonium salt, a complexing agent and a first reducing agent are mixed, contacted and subjected to a combination reaction, and a precursor product is obtained; and roasting the precursor product and a second reducing agent to obtain the carbon-supported platinum-nickel catalyst. The high-purity nickel source is prepared by double decomposition reaction of smelting-grade nickel sulfate salt and ammonium salt, and the surface of the carbon carrier is modified by plasma, so that controllable optimization of oxygen-containing / nitrogen-containing functional groups and pore structures on the surface of the carbon carrier is realized, interaction between the carrier and active components is enhanced, and the catalytic activity of the carrier is improved. The obtained carbon-supported platinum-nickel catalyst has an excellent pore structure and good catalytic activity.

The invention discloses an electrolytic manganese combination reaction rate optimization method based on intelligent control, and relates to the technical field of electrolytic manganese production process optimization. Multiple types of sensors are arranged on the reaction kettle and associated equipment, temperature, pressure, liquid level and other parameters are collected in real time, and data reliability is ensured through filtering and complementing of industrial control software; a reaction rate optimization model is constructed, parameters are optimized by using a BP neural network in combination with historical data, and the prediction error is low; the rotating speed of multiple layers of blades is adjusted according to model output, and a gas distributor is matched to enhance mixing; a heating or cooling device and a pressure regulating valve are driven, and the optimal working condition is maintained; injecting a high-efficiency catalyst in sections; rate comparison and parameter optimization are carried out regularly; and when the monitoring parameters exceed the standard, triggering early warning and executing an emergency instruction. The device improves the material mixing uniformity and the temperature and pressure control precision, accelerates the reaction rate, improves the utilization rate of the raw materials and the catalyst, reduces the energy consumption and pollutant discharge, guarantees the stable production, and has both economic benefits and environmental benefits.

The invention discloses a preparation method of combined bile acid for feed, and the method comprises the following steps: S1, providing a catalyst which is whole cells of clostridium perfringens or bile salt hydrolase extracted from the whole cells of clostridium perfringens; s2, constructing a reaction system, and adding a bile acid substrate, an amino acid substrate and the catalyst into a buffer system with the pH value of 5.0-5.6; s3, under an anaerobic or micro-aerobic condition, carrying out a catalytic reaction at 35-40 DEG C to obtain a reaction solution containing the bound bile acid; and S4, carrying out post-treatment on the reaction liquid to obtain the combined bile acid product for the feed. Whole cells of clostridium perfringens or bile salt hydrolase (BSH / T) extracted from the clostridium perfringens are adopted as a catalyst, the catalyst has high catalytic activity and specificity in an acidic buffer system with the pH value of 5.0-5.6, the binding reaction of bile acid and various non-glycine / taurine amino acids can be efficiently catalyzed, the reaction conditions are mild, strong acid, strong base or high temperature and high pressure are not needed, and the method is suitable for industrial production. The method is suitable for large-scale production.

The invention belongs to the technical field of silicon carbide material production, and discloses a silicon carbide smelting process based on spent material charging in a closed negative-pressure jump-down smelting furnace, which comprises the following steps: step 1, after smelting waste spent materials are crushed by a jaw crusher, screening is carried out by a vibrating screen with the aperture of 5mm to obtain spent material particles with the particle size of not more than 5mm; step 2, doping a sawdust swelling agent into the spent material particles, wherein the doping amount is 3-5% of the total weight of the spent material; and 3, supplementing anthracite and quartz sand into the mixture, and adjusting the content of fixed carbon to 15-20% and the content of silicon dioxide to 60-65%. By forming the high-activity regenerated mixture, the porosity and air permeability of the material are reconstructed through the design, residual carbon and silicon elements efficiently participate in a combination reaction in a core reaction area, negative pressure fluctuation caused by gas retardation is synchronously eliminated, the resource recycling rate is fundamentally increased, and new material consumption and solid waste emission are remarkably reduced.

A production system for producing initiating explosive, comprising a batching device, a chemical reaction washing device, a drying and packaging device, and a waste liquid treatment device. The technical scheme provided by the present application uses a pneumatic diaphragm pump, a peristaltic metering pump, and a vacuum siphon to realize the conveying, injection, and recovery of all reaction solutions and auxiliary solutions. The conveying and circulation of the medicament are carried out in an explosion-proof chamber, and the medicament is prevented from being rubbed, collided, and extruded in the conveying link, so that the safety hidden danger of the production of the initiating explosive is avoided. The production process of each stage can be remotely controlled, the unmanned production can be realized on the initiating explosive production line, the intrinsic safety level can be greatly improved, and the safety risk can be maximally reduced.

The invention provides a method for determining the oxygen content in high-purity selenium for infrared optical glass, which comprises the following steps: introducing 5N high-purity aluminum particles as a transforming agent, combining with two-stage constant-temperature heating, carrying out chemical combination reaction on selenium and aluminum at low temperature to transform the selenium and the aluminum into aluminum selenide, and carrying out detection analysis at relatively high power; the step of baking the furnace is interspersed in the detection of each sample, so that the result is prevented from being interfered by oxidation of selenium adhered to the surface of an electrode on a pulse electrode furnace, the difficulty in detection and analysis of the oxygen content in the high-purity selenium for the infrared optical glass is solved, and a support is provided for quality control of the infrared optical glass and the high-purity selenium.

The invention belongs to the technical field of wheat processing, and particularly relates to a processing production method of selenium-enriched wheat flour. Comprising the following steps: S1, performing cleaning, impurity removal, conditioning, grinding and screening on a wheat raw material to obtain basic wheat flour, and synchronously collecting a protein-rich intermediate material generated in a wheat starch production process; s2, preparing the protein-rich intermediate material into a protein-rich solution with the protein dry basis mass concentration of 10-20%; s3, taking the protein-rich solution as a matrix, carrying out binding reaction on the protein-rich solution and an organic selenium source, and carrying out cross-linking curing, drying and micronization treatment to prepare selenium-rich powder; and S4, mixing the selenium-rich powder with basic wheat flour to obtain the selenium-rich wheat flour. According to the invention, the organic selenium source is crosslinked and solidified in the wheat protein, and the wheat protein is used for embedding and protecting the organic selenium source, so that the water solubility resistance of the organic selenium source is improved, and the retention rate of the organic selenium source in the boiling process is up to 94% or above.

The invention provides a chemical synthesis literature information extraction method. The chemical synthesis literature information extraction method comprises the steps of obtaining a chemical combination reaction schematic diagram and a chemical combination reaction text in chemical literatures; detecting a target entity of the combination reaction schematic diagram through a target detection model; identifying reaction equation information in the chemical combination reaction schematic diagram by utilizing a reaction equation detection model; fusing and filtering composition entities of the target entities and the reaction equation information to obtain reaction data and residual target entities after filtering; determining a compound name corresponding to the molecular structure based on the reaction data of the molecular structure type; performing character string matching on the compound name and the chemical combination reaction text, and fusing the successfully matched compound name and corresponding reaction information into a cue word of a large language model; and performing reaction parameter extraction on the combination reaction text by utilizing a large language model, and combining an extraction result with the reaction data and the filtered residual target entities to determine complete combination reaction parameters.

The application discloses a non-carbon hydrogen fuel with inorganic solid waste coupling high-temperature trigger chain type polymerization reaction continuous energy release, the fuel is composed of inorganic industrial solid waste, through multilevel, chain type, cross solid phase combination reaction between raw material components, the reaction continuously releases heat, and no carbon dioxide is generated in the reaction process, the solid phase combination reaction constitutes a high-temperature trigger chain type polymerization energy release reaction system, and the application relates to the technical field of solid waste resource utilization, the fuel uses inorganic industrial solid waste as all raw materials, through optimization of the proportion of calcium, aluminum, silicon, iron, magnesium and sulfur elements, a multilevel solid phase heat release system which can be excited at high temperature and continuously carried out is formed, the application realizes bulk consumption and high-value energy utilization of intractable inorganic solid waste, provides a brand-new zero-carbon clean heat source, and can be widely applied to industrial kiln heating, solid waste collaborative treatment and other fields.

The invention relates to the technical field of chemical raw material preparation, and discloses an amino-terminated biquaternary ammonium salt compound as well as a preparation method and application thereof. The compound has a structure as shown in a formula I; wherein R < 1 >, R < 2 > and R < 3 > are respectively and independently alkylidene of C1-C3; n1 and n2 are each independently an integer from 0 to 3; r < 4 >, R < 5 >, R < 6 >, R < 7 >, R < 8 > and R < 9 > are respectively and independently H, C1-C4 alkyl or phenyl; x is F, Cl or Br. The amino-terminated biquaternary ammonium salt compound simultaneously comprises an amino-terminated group, a hydroxyl group and a quaternary ammonium salt structure, so that active sites capable of participating in a combination reaction in the compound are remarkably increased, and the amino-terminated biquaternary ammonium salt compound can be used as a modifier to perform positive charge modification on other materials.

The invention provides a single-crystal positive electrode material with a core-shell structure and a preparation method of the single-crystal positive electrode material, and belongs to the technical field of energy storage materials. The preparation method comprises the following steps: weighing a nickel-manganese precursor, a lithium source, rare earth nitrate and molten salt according to a stoichiometric ratio, carrying out ball-milling mixing, and sintering the obtained mixture to obtain a gradient doping material; sequentially washing, drying and annealing the gradient doped material to obtain a doped single crystal positive electrode material; and dispersing nitrate in water, then adding the doped single-crystal positive electrode material to carry out solvation reaction, and sequentially carrying out suction filtration, drying and annealing treatment on a reaction product to obtain the single-crystal positive electrode material with the core-shell structure. The coating layer synthesized by the technical method provided by the invention is uniform and thin, a chemical combination reaction is performed on an atomic layer to form a compound coating, the thickness of the coating is controllable, the electrochemical performance of the electrode is improved while the electrode is protected, and a thought is provided for modification preparation of a core-shell structure positive electrode material.

The present application relates to a method for improving stability of anthocyanin by covalently combining with dialdehyde polysaccharide, and a dialdehyde polysaccharide-anthocyanin covalent conjugate synthesized by covalent combination reaction of dialdehyde polysaccharide and anthocyanin. The obtained dialdehyde polysaccharide-anthocyanin covalent conjugate has the same color as natural anthocyanin, and the synthesis process does not change the color of natural anthocyanin; the obtained dialdehyde polysaccharide-anthocyanin covalent conjugate has the same pH sensitivity (i.e. color developing characteristics under different pH conditions) as natural anthocyanin, and has good application potential in the field of intelligent food packaging; compared with polysaccharide, the obtained dialdehyde polysaccharide-anthocyanin covalent conjugate has higher antioxidant activity, and has application potential in the field of functional food; compared with natural anthocyanin, the obtained dialdehyde polysaccharide-anthocyanin covalent conjugate has higher storage stability under neutral pH and high temperature conditions; and the method has the advantages of simple synthesis process and low cost.

A multi-phase combination reaction system has at least one fixed bed hydrogenation reactor. The fixed bed hydrogenation reactor has, arranged from top to bottom, a first hydrogenation reaction area, a gas-liquid separation area, a second hydrogenation reaction area and a third hydrogenation reaction area. The gas-liquid separation area is provided with a raw oil inlet. A hydrogen inlet is provided between the second hydrogenation reaction area and the third hydrogenation reaction area. The system is capable of simultaneously obtaining two fractions in one hydrogenation reactor.