40results about How to "Guaranteed catalytic efficiency" patented technology

The invention discloses an immobilized enzyme carrier as well as a preparation method and an application thereof. The immobilized enzyme carrier comprises a magnetic nanoparticle, a hydrophilic sol-gel compound and a carbon nano tube, wherein the surface of the magnetic nanoparticle is wrapped by the hydrophilic sol-gel compound to form a hydroxyl-rich shell; one end of the carbon nano tube is wrapped by the hydroxyl-rich shell; and the carbon nano tube is grafted on the surface of the magnetic nanoparticle. The immobilized enzyme carrier and the biological enzyme are combined, so that catalytic efficiency is high; recycling of enzyme is facilitated; and the industrial production cost can be effectively reduced.

The invention provides a method for preparing phenylaniline, which comprises the following steps: mixing cyanophenyl shown in the formula II, first alkaline compounds, nickel catalysts and borophenylic acid shown in the formula III or borophenylic esters shown in the formula VI to carry out suzuki coupling reaction for obtaining cyanobiphenyl shown in the formula IV; mixing the cyanobiphenyl, second alkaline compounds and oxyful, and hydrolyzing the cyanobiphenyl to obtain amido biphenyl shown in the formula V; and mixing the amido biphenyl, third alkaline compounds and sodium hypohalite to generate Hofmann degradation reaction for obtaining phenylaniline shown in the formula I, wherein R1 is chlorine, bromine, iodine, sulphonic acid ester radicals, carbonic ether radicals or alkyl ester radicals; R2 is alkyl, alkoxy, cyano, amido or hydrogen; R3 is chlorine, bromine or iodine; and R4 is alkyl, alkoxy, cyano, amido or hydrogen. The preparing method provided by the invention has the advantages of mild condition, low cost, cleanness and environment protection.

The invention relates to a method for preparing modified polyaniline grafted functionalized graphene composite cadmium sulfide quantum dots. The method comprises the steps of preparing graphene oxide (GO), carrying out ultrasonic dispersion to obtain a uniform solution, putting a certain volume of stronger ammonia water and aniline into the GO solution, carrying out a reaction at a certain temperature so as to obtain functionalized reduced graphene oxide (RGO), uniformly mixing a certain amount of RGO, N-phenylglycine and a cadmium source in an in-situ polymerization system with a weakly acidic atmosphere, adding a certain amount of ammonium persulfate into the mixture as an oxidant, carrying out a reaction so as to prepare a cadmium-containing composite material precursor, and finally, introducing a sulfur source under ice water bath conditions, thereby preparing an N-substituted polyaniline carboxylate grafted graphene cadmium sulfide quantum dot photoelectric material by using a mechanism of nucleation between sulfur and cadmium. According to the composite photoelectric material prepared by the method provided by the invention, the agglomeration of cadmium sulfide and graphene is inhibited through covalent grafting, the light corrosion resistance of cadmium sulfide is improved, the transfer speed of electrons is accelerated, and the efficiency of photoelectric conversion under visible light is increased.

The invention discloses a preparation method of a nanogold-loaded magnetic nanometer catalyst. The preparation method comprises the following steps of adopting a hydrothermal method for synthesizing to obtain a magnetic nanoparticle Fe3O4, and coating the magnetic nanoparticlewith silicon dioxide; modifying the silicon-coated magnetic nanoparticle through a sulfydrylsilane coupling agent: fully dispersing the silicon-coated magnetic nanoparticle into an ethanol solution, adding ammonium hydroxide and stirring, then dropwise adding a silane coupling agent solution with sulfydryl, stirring at the room temperature, magnetically separating a production, and washing; loading nanogold onto the sulfhydrylationmagnetic nanoparticle: after dispersing the sulfhydrylationmagnetic nanoparticle into deionized water, adding a nanogold solution, stirring at the room temperature, magnetically separating a production, and washing to obtain the nanogold-loaded magnetic nanometer catalyst. The preparation method provided by the invention is simple and practicable; experiment conditions are mild and easy to meet; the prepared nanogold-loaded magnetic nanometer catalyst can efficiently and quickly catalyze the reduction reaction of p-nitrophenol, and can be reutilized for not less than 8 times.

The invention discloses a method for preparing maleic acid isopropyl ester. The method comprises the following steps of: (1) preparing sulfonacid ionic liquid onium salt through sultone and nitrogen tertiary amine compounds; (2) dissolving the sulfonacid ionic liquid onium salt into water, slowly dropwise adding acid under ice bath so as to prepare a sulfonacid ionic liquid; and (3) carrying out condensation and reflux reaction on maleic anhydride, isopropanol, the sulfonacid ionic liquid and a water-carrying agent, separating a liquid, circularly catalyzing the sulfonacid ionic liquid at the lower layer, carrying out decompression distillation on an ester layer at the upper layer, then neutralizing with alkali, layering, and carrying out decompression distillation to obtain finished maleic acid isopropyl ester. The sulfonacid ionic liquid catalyst can be recycled and can absorb water, thus being beneficial to forwarding operation of the reaction, and realizing the recovery and recycling of excessive alcohol. The method is simple in procedures, pollution-free and non-corrosion, and has the advantages of being mild in conditions, environment-friendly and economic in benefits.

The application provides a method of hydrogenation recycling of waste mineral oil, which includes the following steps: (a) removing impurities from the waste mineral oil through pressurized settlement, filtration and centrifugal separation; (b) heating the waste mineral oil after the impurity removal and performing oil-water separation to remove water from the waste mineral oil; (c) performing pressure-reduced flash to the dehydrated mineral oil to remove light components and emulsified water; (d) in a multiple-effect tubular falling-film evaporator, performing heat exchange with a heat carrier under a pressure reducing condition, collecting a volatile component from the top to obtain pre-hydrogenated oil; (e) blending the pre-hydrogenated oil with the light components and performing a hydrogenation reaction to obtain a hydrogenation product; (f) feeding the hydrogenation product into a normal pressure distillation column for treatment, and collecting the top products, naphtha and white oil, from the normal pressure distillation column; (g) feeding the bottom product of the normal pressure distillation column into a pressure-reduced distillation column to perform pressure-reduced distillation for producing basic oil. The method has simple processes, is great in raw material adaptability, is not liable to cause coking, and is high in product quality.

The invention provides high-functionality polyether polyol and a preparation method thereof, which are beneficial to reducing or eliminating the influence of a low-functionality initiator on product production based on the preparation method provided by the invention. The invention provides a preparation method of high-functionality polyether polyol, which comprises the following steps: adding a polyether polyol solvent and an initiator into a reaction vessel, adding alkylene oxide into the reaction vessel in the presence of a catalyst, and carrying out ring-opening polymerization reaction onthe alkylene oxide and the initiator in an inert gas atmosphere to generate the high-functionality polyether polyol, the initiators include a high functionality initiator and optionally a low functionality initiator.

The invention discloses a method for improving the water phase reaction circulation capability of a bacterial cellulose-plant fiber composite paper-based catalyst. In the method, a dispersant and a fiber cross-linking agent are added in the process of preparing the paper-based catalyst by compounding bacterial cellulose loaded with metal nanoparticles and plant fibers, so that the water phase reaction recycling capability of the paper-based catalyst is improved. The bacterial cellulose is cellulose secreted and synthesized by bacterial microorganisms. The metals are gold, copper, silver, palladium, chromium, nickel and other metals with catalytic properties. The dispersant is carboxymethyl cellulose, xylan, glucomannan, cationic etherified starch, polyethylene oxide, and the like. The fiber crosslinking agent is polyethyleneimine, polyacrylamide, polyvinyl alcohol, polyamide epichlorohydrin, and the like. The paper-based catalyst prepared by the invention has the advantages of extremely convenient use and recovery, high water phase recycling capability, extremely low metal particle leaching rate, good catalytic efficiency and the like.

The invention discloses a preparation method of a covalent organic framework compound and open-cage fullerene composite material. The method comprises the following steps of: performing chemical cage opening on fullerene, mixing the fullerene with a covalent organic framework, and performing ultrasonic treatment, stirring, washing, soaking and drying to obtain the covalent organic framework compound and open-cage fullerene composite material. The invention further provides application of the composite material, wherein the composite material can be used as an electrocatalyst for efficient hydrogen evolution, can solve the problem that the cost is too high due to the fact that a traditional electrocatalyst depends on precious metal, improves the catalytic activity of the electrocatalyst, can also be applied to adsorption of carbon dioxide, and has higher nitrogen doping rate and larger specific surface area and pore volume compared with traditional adsorbents, so that the material has better adsorbability, selectivity and repeatability. The method is suitable for preparing the covalent organic framework compound and open-cage fullerene composite material, and the prepared composite material can be further applied to carbon dioxide adsorption and can also be used as an electrocatalyst for efficient hydrogen evolution.

The invention relates to a boroxol cyclopentadienyl zirconium metal catalyst, a preparation method and an application. The preparation method comprises adding zirconium dichloride ethylene glycol dimethyl ether solution containing bis (cyclopentadienyl), bis (lindenyl) or relative derivative groups, whose density is 0.02mol/L, mixing and slowly adding boric acid dibasic ester compound and the ethylene glycol dimethyl ether solution of pyridine in 20min, while the pyridine density is 0.02mol/L and the density of boric acid dibasic ester is 0.02mol/L, wherein the mol ratio of boric acid dibasic ester compound, pyridine and the irconium dichloride containing bis (cyclopentadienyl), bis (lindenyl) or relative derivative groups is 1:1:1-1:1:1.05, reacting for 8h, and after the reaction, and evaporating the ethylene glycol dimethyl ether solution to obtain boroxol cyclopentadienyl zirconium metal catalyst. The synthesis materials are cheap, the process is simple, the yield is high, the catalystic polymerization activity is high, the product can be used for the homopolymerization or copolymerization of ethylene and alpha olefin and the synthesized copolymer has adjustable structure.

The invention discloses a method for recycling waste liquid from a butanol device. The method comprises the following steps: a, pretreating the waste liquid from the butanol device through ion exchange resin filled in a fixed bed; b, pressurizing the pretreated waste liquid, fully mixing the pretreated waste liquid with high-pressure hydrogen in a static mixer, and feeding the mixture into a fixed bed reactor for a hydrogenation reaction, wherein the fixed bed reactor is filled with a hydrogenation catalyst; c, after the reaction is finished, removing hydrogen and other light components dissolved in reaction liquid through a high-pressure degassing tank; and d, feeding the degassed reaction liquid to a product refining tower, and carrying out rectifying and separating to obtain butanol. The invention provides the resource recycling method aiming at the specific composition of the waste liquid from the butanol device, and has the advantages of high ester conversion rate, high product selectivity and long catalyst service life.

The invention discloses an efficient carbon fiber supported catalyst and a preparation method thereof. The preparation method comprises the following steps: step 1, dissolving manganese nitrate, copper nitrate and nickel nitrate in deionized water and alcohol, and forming a precursor alcohol solution of nitrate; heating and stirring the precursor alcohol solution until viscous thick gel is formed; and drying and calcining to obtain catalyst powder, wherein the catalyst mainly comprises a mixture of manganese oxide, copper oxide and nickel oxide; step 2, carrying out ball milling on the catalyst powder, and then mixing and stirring the catalyst powder with a prepolymer, a photoinitiator and silica sol for 10-60 minutes to form a mixed dipping solution; and step 3, completely immersing carbon fibers in the mixed dipping solution, carrying out ultrasonic treatment for 0.5-2 h, and then standing for 0.5-2 h; taking out the wet carbon fibers and placing the wet carbon fibers under a high-pressure mercury lamp or a xenon lamp for irradiation until drying; and dipping and loading the carbon fibers once or for multiple times. The catalyst has the advantages of high catalyst loading rate, difficult falling of the catalyst and the like.

The invention discloses a process for catalytically synthesizing dimethyl carbonate, which comprises the following steps: (1) carrying out complex breaking treatment on chemical nickel-plating wastewater, then adding a precipitator, separating out precipitate, and crushing into hydroxide powder; (2) uniformly mixing the hydroxide powder, silicon dioxide powder, calcium oxide powder and a binder, granulating, and calcining the obtained particles in an air atmosphere to obtain a catalyst precursor; and (3) soaking the catalyst precursor in clear water, cleaning, repeatedly executing the step until the pH value of the cleaning solution is constant, taking out a solid product, and drying to obtain the porous catalyst. And (4) taking the porous catalyst as a catalyst, preparing dimethyl carbonate by adopting a methanol-carbon dioxide direct method, inserting an ultrasonic vibration rod into the liquid level of methanol during preparation, and separating out dimethyl carbonate after completion. According to the process disclosed by the invention, the industrial waste liquid is used as a raw material and is modified to prepare the catalyst, so that the cost of the catalyst is reduced, and the conversion rate of methanol is effectively improved.

The invention discloses a welding tool for packaging a marine catalyst module, which comprises two oppositely arranged positioning mechanisms, wherein the catalyst module is positioned by the two positioning mechanisms; and each positioning mechanism comprises a fixed base and a positioning frame fixedly arranged on the fixed base, each positioning frame comprises two supporting inclined plates which are obliquely fixed on the fixed base, a supporting area with an included angle of 90 degrees is defined by the two supporting inclined plates, the catalyst module is placed in the supporting area, and the supporting areas of the two positioning mechanisms are oppositely arranged to realize positioning of the catalyst module. According to the welding tool for packaging the marine catalyst module, a shell of the catalyst module is fixed and welded, so that the integrity of a catalyst is ensured, arrangement and placement of the catalyst in a reaction chamber are facilitated, and meanwhile, a catalyst carrier is prevented from being broken and the like.

The invention discloses a novel external suspension photocatalysis membrane water purifier. The novel external suspension photocatalysis membrane water purifier comprises a water inlet tank, a water pump, a first filter, an active carbon filter, a photocatalysis reactor, a membrane separation system, an activation mineralization device, a reflux pump, a suction pump, solenoid valves 1-6, and an air compressor; the water inlet tank is connected with the water pump, the first filter, and the active carbon filter successively; the active carbon filter is connected with the photocatalysis reactor;the photocatalysis reactor is connected with the 6th solenoid valve, and then is connected with the membrane separation system; a first water outlet is connected with a three-way valve, and the suction pump; a water suction pump is connected with the 5th solenoid valve, and is connected with the activation mineralization device; a second water outlet is connected with the 3th solenoid valve, andis connected with the photocatalysis reactor; an aeration pipe is arranged in the photocatalysis reactor; a micropore aeration mechanism is arranged in the membrane separation system, and is connectedwith the air compressor through a pipeline. The novel external suspension photocatalysis membrane water purifier is capable of enhancing catalytic efficiency and membrane anti-pollution capacity, reducing operation energy consumption, is large in water processing amount, and possesses water activation and mineralization functions.

The invention discloses a poison-resistant layered granular catalyst and a preparation method thereof, and relates to the technical field of catalysts. The catalytic efficiency of the poison-resistant layered granular catalyst is ensured by forming a coating layer containing pores on the outer layer of a catalyst core containing catalytic active components. Poisoning substances such as SO2, H2O and alkali metal can be prevented from being in direct contact with active substances. The catalyst has good SO2, H2O and alkali metal poisoning resistance.

The invention discloses a rapid water temperature balance adjusting device which comprises a tank body, heat exchangers, water pumps and electromagnetic valves, wherein a heat exchanger I and a water pump II are respectively connected to two sides of the top of the tank body by virtue of a bent tube I and a bent tube II; a water pump I and a heat exchanger II are connected to two sides of the bottom of the tank body by virtue of a connecting tube I and a connecting tube II; the heat exchanger I and the water pump I are connected by virtue of a middle tube I; the heat exchanger II and the water pump II are respectively connected with a backflow tube by virtue of a middle tube II; the heat exchanger I is further connected with a water inlet tube; the water pump I is connected with a water outlet tube; one electromagnetic valve is arranged on each tube; the connecting part of the middle tube II and the water pump II and the connecting part of the connecting tube I and the tank body are respectively provided with one temperature sensor. As two groups of heat exchangers are adopted to heat simultaneously, the speed in heating water inside the tank body is increased, the temperature of output hot water is kept in a constant state, and the catalysis efficiency of enzyme in corn starch is well ensured.