67results about How to "Reaction does not affect" patented technology

The invention discloses a method for preparing a nano copper / carbon nano tube composite powder by a liquid phase method, and relates to a preparation method of nano copper / carbon nano tube composite powder. The method solves the problems that the conventional preparation method of the nano copper / carbon nano tube composite powder is complex and high in cost and the nano copper particles are difficultly controlled. The method comprises the following steps of: adding acidified carbon nano tube and polyvinyl pyrrolidone (PVP) into copper sulfate solution, regulating pH, then adding hydrazine hydrate to obtain mixed solution, reacting the mixed solution at the temperature of between 60 and 80 DEG C, cooling to room temperature, performing suction-filtration to obtain powder, and drying the powder in vacuum at the temperature of 50 DEG C to obtain the composite powder. The nano copper in the prepared composite powder is uniformly distributed on the surface of the carbon nano tube, and the nano copper and the carbon nano tube form a chemical bond. Under the alkali condition, the hydrazine hydrate is used as a reducing agent, and a large amount of nitrogen is generated at the same time of reducing copper ions, so that oxidation of the nano copper can be effectively prevented; and the size of the nano copper particles can be controlled in a range of 40 to 50 nanometers by adding the PVP. The preparation method is simple in process and low in cost, and the nano copper particles are easily controlled.

The invention discloses a system and a method for avoiding corrosion of a metal-air fuel cell during shutdown. The system comprises a battery chamber, wherein an air positive electrode and a metal negative electrode arranged in a spacing are arranged in the battery chamber. The battery chamber is provided with a first electrolyte inlet, a first protective solution inlet, a first electrolyte outletand a first protective solution outlet. An electrolyte storage device having a second electrolyte inlet and a second electrolyte outlet, the second electrolyte inlet being connected to the first electrolyte outlet and the second electrolyte outlet being connected to the first electrolyte inlet; A protective liquid storage device having a second protective liquid inlet and a second protective liquid outlet, the second protective liquid inlet being connected to the first protective liquid outlet and the second protective liquid outlet being connected to the first protective liquid inlet. The system avoids the self-corrosion of the metal negative electrode of the metal-air fuel cell in the down state, and can switch the operation and stopping states of the cell freely at the same time. The service life of metal-air fuel cell is significantly prolonged.

The invention discloses a multistage hydrogenation method for heavy hydrocarbon. The method comprises the following technical steps of: mixing a condensed heavy hydrocarbon raw material and a gas phase material flow discharged from a hydrogenation desulfurization reactor and a hydrogenation denitrification reactor, and putting the mixture into a boiling bed hydrogenation demetalization reactor; cooling and purifying the reacted gas phase material flow and taking the cooled and purified reacted gas phase material flow as recycled hydrogen; mixing a liquid phase material flow subjected to the boiling bed demetalization reaction and the hydrogen, and putting the mixture into the hydrogenation desulfurization reactor; mixing the liquid phase material flow subjected to the desulfurization reaction with the hydrogen, and putting the mixture into the hydrogenation denitrification reactor, wherein at least one of the hydrogenation desulfurization reactor and the hydrogenation denitrification reactor is a fixed bed reactor. Compared with the prior art, the method provides a novel flexible, efficient and energy-saving operating mode for treating inferior heavy and residual oil raw materials; the property of the raw materials is organically combined with characteristics of the hydrogenation reactions, so the reaction released heat is fully used, the quality of the product is perfect and the operation process can be flexibly adjusted as required on the premise of guaranteeing the stable operation of a device.

The invention discloses a method for fast and accurate quantitative determination of circulating DNA in blood. The method comprises the following specific steps that processing of plasma or serum is performed: peripheral venous blood is taken and arranged in an EDTA anticoagulant tube for standing at room temperature, or self-clotting whole blood is taken to undergo centrifugation under 1800-2200 g of centrifugal force for 4 to 6 minutes, upper-layer plasma is taken, the same volume of diluted reagent is added, even mixing is performed, stirring is performed at the temperature of 92-97 DEG C for 6 to 10 minutes, then centrifugation is performed again under 15000-17000 g of centrifugal force for 8 to 12 minutes, and supernate is taken as a template for PCR; a quantitative PCR reaction system is configured; quantitative PCR reaction is performed. The quantitative PCR reaction can be performed by directly using the processed plasma or serum, PCR reaction is not influenced, the amplification efficiency is consistent with the amplification efficiency of purified DNA, DNA extraction steps and experimental errors are decreased, a new fluorescent dye SuperGreen which is higher in concentration, high in fluorescent signal value and response sensitivity and capable of accurately detecting plasma free DNA as low as the nanogram level can be adopted, the reagent price is low, the using cost of a DNA extraction kit is reduced, and operation is easy and convenient.

The invention discloses a method for quantitatively determining blood circulation DNA (Deoxyribonucleic Acid). The method comprises the following steps of: obtaining 1ml of peripheral venous blood of the same tumor patient and placing the peripheral venous blood into an EDTA (Ethylene Diamine Tetraacetic Acid) anti-freezing pipe; standing for 4 hours at 10-20 DEG C; centrifuging 2000g of peripheral venous blood for 5 minutes; taking 100-200 microliters of upper-layer blood plasma; adding a buffering solution with the same volume and sufficiently and uniformly mixing; standing at 95 DEG C for 5-10 minutes; centrifuging 16000g of peripheral venous blood for 10 minutes; and taking a liquid supernatant as a template to be directly used for quantitative PCR (Polymerase Chain Reaction) amplification. The method disclosed by the invention has the beneficial effects that 1. blood plasma or blood serum can be directly used for a quantitative PCR reaction through special technical process treatment and the PCR reaction is not influenced; ratios of amplification efficiencies to the purified DNA are consistent, and extraction steps and experimental errors of the DNA are reduced; and 2. an adopted novel fluorescent dye Super Green has slight inhibition effect in a PCR amplification process and high concentration can be used; and a fluorescence signal value is high and the reaction sensitivity is high, and blood plasma free DNA which is at a nanogram level can be accurately detected.

The invention provides a preparation method of a ternary positive electrode material precursor, wherein a reaction kettle, a circulating pump and a dynamic separation device which are sequentially communicated to form a suspension loop are utilized, so that the reaction efficiency and the product uniformity are effectively improved. The method comprises the following steps: preparing a metal salt mixed solution, a precipitant solution and a complexing agent solution, and adding the solutions into a reaction kettle in a parallel flow manner; controlling the reaction temperature in the reaction kettle to be 20-95 DEG C, the pH value to be 10-13 and the ammonia concentration to be 5-12g / L, and reacting; after the reaction kettle reaches a set liquid level, conveying the suspension liquid in the reaction kettle to a dynamic separation device through a circulating pump, carrying out solid-liquid separation, collecting separated mother liquor clear liquid to a mother liquor discharge tank, returning concentrated slurry to the reaction kettle for continuous reaction, and stopping feeding until solid materials in the reaction kettle meet specified physical and chemical characteristics; and unloading the materials to a finished product storage tank to enter a subsequent treatment process.

The invention discloses a flue gas treatment system of a large chimney for industrial waste gas emission. The flue gas treatment system comprises an inner shell, and an outer shell arranged in the inner shell in a sliding manner, wherein first fixing spaces are symmetrically formed in the outer shell around the outer shell; mounting connecting rods are hinged onto the first fixing spaces; and elastic rubber rings that can be clamped with inner walls of the chimney are fixedly arranged on the connecting rods. A slide bar is pulled to slide upwards by a handle by pushing the handle upwards, a pull rod is pulled upwards by the slide bar, the connecting rods are pulled to rotate by the pull rod, so that the elastic rubber rings are clamped with the inner walls of the chimney, namely the innershell and the outer shell can be fixed on the chimney and mounted on the top of the chimney, and flue gas can be respectively subjected to dust fall treatment and water bath washing treatment. Therefore, emission of the flue gas is up to the standard, a filter screen can be automatically cleaned, manual working is reduced, the flue gas can be subjected to accelerated treatment, and the treatment rate is increased.

The invention relates to the field of petrochemical engineering, and particularly relates to a technical method for removing propylene glycol in a hydrogen peroxide direct oxidation method used for preparing propylene oxide. The technical method comprises the following steps: mixing dehydration is carried out on a catalyst with hydrogen peroxide and an organic solvent to obtain a mixed liquid; themixed liquid reacts with liquid propylene in a reaction system after dehydration to obtain a reaction working solution; the final reaction working solution enters a crude separation tower, light components such as propylene, epoxypropane and the like are distilled out from the top of the tower, and heavy components such as propylene glycol, a catalyst and the like are distilled out from the bottom of the tower; and further separation is carried out on the light components at the tower top and the heavy components at the tower bottom. According to the final reaction working solution provided by the invention, the heavy components are separated out first by utilizing the crude separation tower, most parts of heavy components containing the catalyst are directly recycled, and small parts ofthe heavy components containing the catalyst are treated by a filter of a water scrubbing tower for recycling the catalyst, so that loss of the catalyst and investment of the filter are reduced. Smallparts of the heavy components are treated by the water scrubbing tower and a propylene glycol recycling tower for recycling propylene glycol, and propylene glycol remaining in the reaction system does not influence the reaction. In addition, the amount of the heavy components is small, so that investment cost and operation cost of the water scrubbing tower and the propylene glycol recycling towerare reduced.

The invention belongs to the field of organic silicon materials, and discloses a preparation method of a siloxane quaternary ammonium salt. The preparation method comprises the following steps of making allyl polyether carry out a hydrosilylation reaction with hydrogen-containing silicon oil under the action of a catalyst, so as to obtain polyether modified siloxane, afterwards, making the polyether modified siloxane carry out a reaction with chloracetyl chloride at 50 to 70 DEG C, after the reaction is completed, adding alkoxide of alkali metal and alcohol which serve as a neutralization reagent and a thinner respectively into a reaction system until the pH (potential of Hydrogen) value of the system is 8.8 to 9.5, filtering an obtained first mixture to remove a generated slat, so as to obtain acylated polyether modified siloxane, and then adding a quaternization reagent into the acylated polyether modified siloxane to carry out a quaternization reaction, removing a low-boiling-point substance, and filtering an obtained second mixture, so as to obtain the siloxane quaternary ammonium salt. According to the preparation method, the chloracetyl chloride is adopted as an acylation reagent; the alkoxide of the alkali metal is used as a neutralizer; the reaction activity is high; the condition is mild; water is not generated; side reactions are few; the yield is high; the product quality is favorable. The siloxane quaternary ammonium salt can be used as a self-emulsifying fabric softener.

The invention belongs to the field of organic silicon materials, and discloses a preparation method of a siloxane quaternary ammonium salt. The preparation method comprises the following steps of making allyl polyether carry out a hydrosilylation reaction with hydrogen-containing silicon oil under the action of a catalyst, so as to obtain polyether modified siloxane, afterwards, making the polyether modified siloxane carry out a reaction with chloracetyl chloride at 50 to 70 DEG C, after the reaction is completed, adding alkoxide of alkali metal and alcohol which serve as a neutralization reagent and a thinner respectively into a reaction system until the pH (potential of Hydrogen) value of the system is 8.8 to 9.5, filtering an obtained first mixture to remove a generated slat, so as to obtain acylated polyether modified siloxane, and then adding a quaternization reagent into the acylated polyether modified siloxane to carry out a quaternization reaction, removing a low-boiling-point substance, and filtering an obtained second mixture, so as to obtain the siloxane quaternary ammonium salt. According to the preparation method, the chloracetyl chloride is adopted as an acylation reagent; the alkoxide of the alkali metal is used as a neutralizer; the reaction activity is high; the condition is mild; water is not generated; side reactions are few; the yield is high; the product quality is favorable. The siloxane quaternary ammonium salt can be used as a self-emulsifying fabric softener.

The invention relates to a preparation method of a polyurethane energy-absorbing material. Hydroxyl silicone oil is adopted as a good solvent for boriding organosilicon polymer to prepare shear thickening fluid, thereby overcoming the problems of splitting phase, difficultly controlling the volatilization amount of isopropanol, producing side reaction with MDI and the like in the prior art. Compared with the prior art, the preparation method of the polyurethane energy-absorbing material is simple in preparation technique, short in preparation cycle, strong in operation controllability, and capable of improving the stability of products and benefiting the realization of large-scale production.

The invention discloses a chemical reaction kettle dirt clearing device, and belongs to the technical field of chemical reaction kettle maintenance equipment. The device comprises a reaction kettle, wherein the reaction kettle comprises a kettle body and a kettle cover, a motor is arranged on the kettle cover, a rotating shaft of the motor is arranged on the inner side of the kettle cover, the rotating shaft of the motor is connected with a dirt clearing mechanism through a coupler, and a spraying mechanism is arranged on the inner side of the kettle cover; the dirt clearing mechanism comprises a vertical rod and a U-shaped rod connected with the lower end of the vertical rod, wherein bristles are arranged on the outer side of the U-shaped rod, the spraying mechanism comprises a disk, a through hole for allowing the vertical rod to penetrate through is formed in the center of the disk, a spraying pipe is arranged on the bottom surface of the disk, a spraying pipe connector is arrangedon the kettle cover, the spraying pipe and the spraying pipe connector are communicated, and the other side of the spraying pipe connector is communicated with a water pump through a high pressure hose. By means of the chemical reaction kettle dirt clearing device, the reaction kettle is cleared comprehensively and thoroughly, and the cleaning efficiency is high.