17 results about "Combination reaction" patented technology

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 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 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 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 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 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 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 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 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.

The present application belongs to the field of harmful algal bloom prevention and control, and particularly relates to a preparation method of an environmentally-friendly and efficient alga-removing organic quaternary ammonium salt modified clay. The preparation method comprises the following steps: performing hydroxyl activation treatment on the surface of a raw clay mineral, adding an organic quaternary ammonium salt modifier (Si-QAC) containing a silane group after the treatment, controlling the valence bond combination reaction between the silane group contained in the modifier molecules and the active sites on the surface of the clay, and then obtaining the organic quaternary ammonium salt modified clay. The present application has the advantages that the valence bond action between the silane group in the organic silicon quaternary ammonium salt molecules and the active sites on the surface of the clay is utilized to realize the precise control and strong bonding of the organic quaternary ammonium salt molecules in the grafting modification on the surface of the clay, and an efficient and stable alga-removing composite material is obtained, thereby providing a new method for precisely synthesizing the organic quaternary ammonium salt modified clay with good ecological safety.