70results about How to "Fast catalytic reaction" patented technology

The invention discloses a selective-oxidized chitosan and a heterogeneous preparation method thereof. The method is characterized in that according to preparation of the oxidized chitosan, macromolecular chitosan is dissolved in an ionic liquid, the chitosan is precipitated from the ionic liquid by adding absolute ethyl alcohol, and porous chitosan is obtained after the ionic liquid in a precipitation is fully replaced through absolute ethyl alcohol dipping and ultrasonic oscillation; the porous chitosan is moistened and expanded in the ionic liquid to form a semisolid gel with certain viscosity, and then partial or all hydroxyls at C6 position in pyranose rings of the chitosan are selectively oxidized into carboxyls in an ionic liquid medium to obtain the selective-oxidized chitosan with adoption of a concentrated nitric acid-concentrated phosphoric acid-sodium nitrite system. According to the method, operation is simple and convenient, the oxidation reaction rate is high, the oxidation degree of the chitosan is easily controlled, oxidation products are easy to separate, the yield of the products is high, the prepared carboxyl chitosan has good antibacterial activity and water solubility, and the ionic liquid can be recycled for cyclic utilization, which is environmentally friendly.

The invention discloses a ceramic silk-screen hydrogenation protective agent which is obtained by the following steps: forming powder materials formed by raw materials of 20-30 wt% of pseudo-boehmite, 40-55 wt% of alumina powders, 10-20 wt% of silicon carbide powders, 2-5 wt% of rare earth magnesium alloy powders, 2-5 wt% of zirconia powders and 3-5 wt% of kaolin; adding an auxiliary agent and appropriate amount of water in the powder materials, carrying out ball-milling and mixing and carrying out blending until viscosity is 22-30s according to a T-4 viscosity cup, and then, carrying out filtering to obtain slurry; dipping a sponge base into the slurry above, standing still, and then taking the sponge base out and removing the surplus slurry to obtain a green body; and after carrying out drying and shaping on the green body, putting the green body into a calcinator, carrying out heating until the temperature reaches 1100-1280 DEG C, and then, carrying out heat preservation baking to obtain the product. The ceramic silk-screen hydrogenation protective agent is light in specific gravity, high in porosity and small in stacking density; impurity tolerance capability of the ceramic silk-screen hydrogenation protective agent is improved by 30% and the above compared with that of a honeycomb pore ceramic protective agent, and is improved by 50% and the above compared with that of a conventional porcelain ball (porcelain ring); and since the protective agent has multiple holes, circulation velocity of liquid is accelerated, activity is enhanced, catalytic reaction speed is improved, and the hydrodesulfurization processing effect is improved.

The invention provides an efficient self-adaptation catalytic cracking device suitable for a regenerative cooling detonation combustion chamber. On the basis of the regeneration cooling scheme, the device comprises a bottom-layer heat exchange layer, a middle-layer catalytic cracking layer, a top-layer gas-liquid separation layer and a device fixing structure. By utilization of a radial fuel jetting port and an expansion outlet channel evenly distributed in the circumferential direction of the heat exchange layer in an interphase manner are utilized for achieving uniform heating and flowing speed reduction of fuel, and accordingly, a large amount of micromolecule gas-state fuel is generated in a middle-layer honeycomb-shaped catalytic cracking layer coated with an efficient catalyst, wherein the micromolecule gas-state fuel is excellent in detonation performance and narrow in component kind range. Through an adaptively-adjusted N-shaped baffle plate structure in the gas-liquid separation layer, fuel oil liquid drops unfavorable to detonation and combustion in products can be effectively separated and split. The device can achieve efficient fuel splitting, mixed gas-state fuel withhigh explosion performance is continuously obtained; and in addition, the device can sufficiently utilize physical and chemical heat sink of the fuel, and the cooling efficiency of the detonation combustion chamber is improved.

The invention discloses a preparation method for a catalyst based on waste steel slag, wherein the preparation method comprises the following steps: 1) raw material grinding and crushing; 2) raw material mixing; 3) blank molding; 4) blank drying: drying the blank prepared in the step 3) at the temperature of 200-220 DEG C to make the water weight percentage content be less than 0.8%; and 5) blank sintering: sintering the blank dried in the step 4) at the temperature of 900-1150 DEG C, to obtain the catalyst based on the waste steel slag. The catalyst has the advantages of fast catalytic reaction speed on ozone, high COD degradation rate, less ozone consumption rate, no secondary pollution when in use, and high specific surface area.

The invention discloses a method for synthesizing and purifying high-purity fatty acyl monoglyceride. The method comprises the following steps: mixing fat, glycerol and solid base catalyst, vacuumizing, stirring and heating to obtain a fat mixture; under vacuum conditions, connecting a condensation return pipe to carry out ester exchange reaction; filtering the reaction product, and standing or carrying out centrifugal stratification, wherein the supernatant is a glyceride layer, and the understratum is a glycerol layer; carrying out primary molecular distillation on the glyceride layer to remove free fatty acid and glycerol; and carrying out secondary molecular distillation on the glyceride layer without the free fatty acid and glycerol to obtain a distillate and distillation residues, wherein the distillate is the high-purity fatty acyl monoglyceride, and the distillation residues are diglyceride and triglyceride. The invention shortens the procedure, and saves the equipment investment; compared with the solid acid catalysis technology, the invention uses fat as the raw material, and does not need fatty acid; and the invention does not need to dropwisely add glycerol, control the temperature of cooling water or the like, and thus, has the advantages of simpler reaction operation, higher solid base catalysis reaction speed and higher production efficiency.

The invention discloses water-soluble oxidized chitosan and a finishing method of the water-soluble oxidized chitosan on a fabric. The water-soluble oxidized chitosan is prepared by the following steps: dissolving chitosan in a 1-carboxymethyl-3-methylimidazolium hydrogen sulfate aqueous solution, oxidizing C2 and C3 sites of the chitosan by sodium periodate under microwave radiation to generate aldehyde groups, and then oxidizing primary hydroxyl at C6 site of the dialdehyde chitosan in an ionic liquid by concentrated nitric acid-concentrated phosphoric acid to generate carboxyl. The water-soluble oxidized chitosan can be used for modifying fabrics. Compared with a traditional chemical cross-linking agent modified fabric, the method has the advantages that the grafting efficiency of the oxidized chitosan is high, the enzyme treatment condition is mild, the reaction process is simple, the fabric is crease-resistant, antibacterial, efficient and lasting, the fabric is comfortable to wear, and the requirements of people on lasting functional ecological textiles are met.

The invention discloses a method for preparing a chitosan modified carboxylation cotton fabric in an ionic liquid medium. The method is characterized by comprising the following steps: firstly, dissolving low-crystallization chitosan into an ionic liquid, carrying out selective oxidation on a cotton fabric after desizing and boiling in isopropanol in a concentrated nitric acid / strong phosphoric acid-sodium nitrite system, further stirring a carboxylation cotton fabric and chitosan in the ionic liquid medium at 30-40 DEG C to implement an amide chemical reaction, removing the ionic liquid, carrying out vacuum drying and water washing, thereby obtaining the chitosan modified carboxylation cotton fabric. The method disclosed by the invention is simple and feasible, rapid in amide reaction, high in grafting rate, possible in ionic liquid recycling and green and environmentally friendly, the prepared chitosan amide modified cotton fabric has a long-lasting and efficient antibacterial capability, is affiliative to human bodies, is safe and sanitary and good in wearing comfort, overcomes adverse influence caused by chemical cross-linking agents and acid solutions upon excellent propertiesof cotton fabrics and human health in conventional chitosan modification, and has wide practical application prospects.

Relating to the field of air purification, the invention discloses an air purification device based on ultrasonic technology. The device includes an ultrasonic atomization dust removal module, a ceramic heating module, a filtering module, an ultrasonic vibration gas purification module, a water tank, a water circulation module, a fan, an external shell and a drive circuit module. During work, airenters from a side of the bottom and moves upward to firstly pass through the atomization dust removal module with water fed by the water tank; then the air passes through the ceramic heating area forheating drying; then the treated air passes through the filtering module and the ultrasonic vibration purification module in order; and finally the treated air is discharged by the top fan. Specifically, the settled and condensed water containing particulate matters in the ultrasonic atomization dust removal module flows into a sink below, passes through a filter layer, and then flows back into the water tank through a water pump from an upstream water pipe. The air purification device based on ultrasonic technology provided by the invention can be used for indoor and outdoor air purification, has comprehensive functions, also can purify gas pollutants according to needs, has compact unit modular structure, can be combined with street lamps, isolation guardrails and the like, and fills inthe blank of purification system in the field of municipal facilities.

A method of treating refractory pollutants utilizes the pyrite cinder as catalyst which forms a heterogeneous Fenton system with H2O2 to catalyze H2O2 to generate hydroxyl radical (.OH) with strong oxidability and degrade the organic pollutants efficiently and quickly. The method comprises the following steps: (1) after the waste water is added in a reactor, a given amount of pyrite cinder original sample or activated and pretreated cinder is added in the waste water; (2) H2O2 solution is added in a mixed liquid of the waste water and the pyrite cinder so as to form an analogous Fenton reagent with the pyrite cinder; (3) stirring is carried out so as to lead the pyrite cinder, the H2O2 solution and the waste water to be mixed for reaction, and the stirring is stopped at the set reaction time; and (4) standing is carried out, the pyrite cinder is quickly precipitated and the supernate is discharged, so that the pyrite cinder can be reused. The invention discovers a novel analogous Fenton oxidation catalyst, extends the resource utilization ways of the pyrite cinder, achieves the purpose of controlling waste by waste and realizes the comprehensive utilization of the waste.

The invention provides a method for preparing tofacitinib citrate. The method for preparing tofacitinib citratecomprises the following steps that1, N-methyl-N-((3R,4R)-4-methylpiperidine-3-yl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine and ethyl cyanoacetate are added into methyl alcohol for condensation reaction to prepare and obtain 3-((3R,4R)-4-methyl-3-(methyl(7H-pyrrolo[2,3-d]pyrimidin-4-yl)amino)piperidin-1-yl)-3-oxopropanenitrile;and 2,3-((3R,4R)-4-methyl-3-(methyl(7H-pyrrolo[2,3-d]pyrimidin-4-yl)amino)piperidin-1-yl)-3-oxopropanenitrileis added to a mixed solvent and subjected to 80+ / -5 DEG reflux, additionally, citric acid is dissolved in the mixed solvent and then added slowly to a reflux system forsalt forming reaction, cooling, filtration, washing, and drying to obtain 3-((3R,4R)-4-methyl-3-(methyl(7H-pyrrolo[2,3-d]pyrimidin-4-yl)amino)piperidin-1-yl)-3-oxopropanenitrile citrate. According to the method for preparing tofacitinib citrate, operation isconvenient, time consumption isless, the yield rate is high, product impurity is low,and purity is good.

The invention relates to a preparation method and application of a lithium affinity-cobalt and manganese composite metal based organic frame catalyst of a lithium-oxide battery cathode. Cobalt acetate, manganese acetate and terephthalic acid are added to N,N-dimethyl formamide, and then transferred to a hydrothermal reactor for hydrothermal reaction; the mixture is washed by enthanol and then undergoes centrifugation, a supernatant solution is removed, and a centrifugation product is reserved; and the centrifugation product is dried, ground and sieved to obtain the cobalt and manganese composite metal based organic frame catalysis material. The preparation method is simple and easy to operate, the specific surface area is larger, more active sites are included, and the electron conductivity is high; and the material applied to a lithium affinity ZnO / CNT as a leveling layer of the cathode can attract lithium ions, catalytic reaction can be carried out in a better and rapider way, and the circulation life of the lithium-oxide battery is prolonged.