25results about How to "Lower conversion rate" patented technology

The invention discloses a device and a method for direct catalytic cracking of electric heating crude oil. A plurality of nozzles are arranged in the circumferential direction of the side wall of the fluidized bed and are close to the bottom of the fluidized bed; a slag discharge port and a first gas inlet are formed in the bottom of the fluidized bed; a plurality of output ends of the raw material and catalyst mixer are respectively connected to the plurality of corresponding nozzles; the second heating assembly extends into the fluidized bed; the annular heating area is located above the nozzle, and the first air inlet corresponds to the annular heating area; one end of the reaction tube is connected to the top of the fluidized bed, and the other end is connected to the input end of the cyclone separator; the first heating assembly is arranged on the outer wall of the vertical part of the reaction tube; the first output end of the cyclone separator is connected to the fine coke particle storage area, and the second output end of the cyclone separator is connected to the input end of the cooling separator. An electric heating heat supply mode is adopted, a cheap catalyst does not need to be burnt and regenerated, a regenerator-free device is adopted, carbon emission is low, the structure is simple, and operation is convenient.

The invention relates to a synthesis process of low-calcium polyepoxysuccinic acid, and belongs to the field of chemical engineering. The synthesis process comprises the following steps: adding water and caustic soda liquid into a reaction kettle, and adding maleic anhydride; maintaining the reaction temperature to be 70-80 DEG C, dropwise adding hydrogen peroxide, adding an epoxidation reaction catalyst for multiple times during dropwise adding, and maintaining the pH value to be 4.0-6.5 by using liquid caustic soda; after the hydrogen peroxide is dropwise added, the temperature is kept at 70-80 DEG C, the pH value is 4.0-6.5, and the temperature is kept for 3 hours; after heat preservation is finished, liquid caustic soda is added into the reaction kettle, the temperature is increased to 80-90 DEG C, the pH value is increased to 10.0-12.5, calcium salt is added, the temperature is increased to 90-95 DEG C, negative pressure is started for concentration, heat preservation is continued for 2 hours at normal pressure of 90-95 DEG C, and the reaction is finished; and supplementing water into the reaction kettle, and cooling to below 50 DEG C to obtain the low-calcium PESA product. According to the invention, the problem that calcium ions contained in PESA are combined with silicate to generate calcium silicate precipitate is solved, so that PESA can be better used in the water quality condition containing silicate.

A cyclohexyl imine production system comprises a reactor, a filter, a dealcoholization tower, a decanter, and a separation tower, wherein a feed port is provided at the bottom of the reactor for connecting with adiponitrile, ethanol, alkali, and a hydrogen source, a discharge port is provided at the top of the reactor, and the dealcoholization tower is fed through the filter, the bottom liquid outlet of the dealcoholization tower is connected to the decanter, and the light phase outlet of the decanter is connected to the feed port of the separation tower. The present invention has a simple structure and is easy to operate, and can continuously and stably produce cyclohexyl imine and hexamethylenediamine at the same time, meeting the actual needs of chemical enterprises.

This invention relates to the field of water-soluble polymer materials technology, and discloses a comb-shaped ternary polymer and its preparation process. The polyacrylamide is polymerized from a backbone monomer, anionic monomer, comb-shaped macromolecular monomer, and optional functional reinforcing monomers under the action of a redox and azo-based composite initiation system. The preparation process includes solution preparation and neutralization, deoxygenation and temperature control, adiabatic polymerization, and post-treatment steps, employing a control strategy combining low-temperature initiation and adiabatic temperature rise polymerization. This invention effectively overcomes the defects of traditional linear polymers—low viscosity retention and poor shear resistance—in high-temperature and high-salt environments by introducing comb-shaped side chains to create a steric hindrance effect. The resulting product possesses ultra-high molecular weight, low water-insoluble content, and excellent solubility, exhibiting excellent salt-resistant thickening advantages and mechanical stability, meeting the oil displacement requirements of harsh reservoir environments.

The invention relates to a preparation method of a platinum-based catalyst and application of the platinum-based catalyst in catalytic oxidation reaction. A used carrier is a hydroxyapatite and ferric oxide compounded carrier, an active species platinum is loaded on the carrier by adopting an electrostatic adsorption method, and then high-temperature roasting is performed in an oxidizing atmosphere, so that platinum nanoparticles and the carrier have strong metal carrier interaction. The characterization result shows that the platinum nanoparticles dispersed on the surface of the composite carrier are wrapped by the carrier, and the appearance of the wrapping layer provides excellent stability for the catalyst. And a small amount of ferric oxide is added, so that the catalyst can still keep good catalytic performance even after being roasted at the high temperature of 600 DEG C. The prepared catalyst can be used for CO catalytic oxidation, the CO conversion rate does not have an obvious decrease trend after continuous operation for 200 hours under the reaction condition, and the catalyst has excellent stability and sintering resistance and shows good development potential.

The present invention relates to the technical field of catalyst preparation, and specifically to a preparation method and application of an ultra-low temperature denitration catalyst. The preparation method of the ultra-low temperature denitration catalyst comprises the following steps: (1) adding a molybdenum salt and a complexing agent to pure water, heating and stirring, dissolving the molybdenum salt completely, obtaining a molybdenum complex solution, and then roasting to obtain modified molybdenum oxide; (2) adding a vanadium salt and a complexing agent to pure water, heating and stirring, dissolving the vanadium salt completely, cooling, and obtaining a vanadium complex solution; (3) adding titanium dioxide and modified molybdenum oxide to the vanadium complex solution, stirring evenly, drying, and roasting to obtain an ultra-low temperature denitration catalyst. The present invention improves the denitration performance of the denitration catalyst at ultra-low temperatures, while reducing SO 2 / SO 3 Conversion rate.

The present invention relates to the field of catalyst technology, specifically to a method for preparing a dual-activity catalyst based on an alumina skeleton and its application. The dual-activity catalyst is prepared by loading a metal on mesoporous alumina by a pH adjustment method, and is used in the catalytic reaction of exhaust gas. The present invention controls the amount of template agent, the drying and calcination temperatures, and the pore size of the obtained mesoporous alumina is uniform; the present invention changes the type of template agent and adjusts the reduction temperature to obtain a dual-activity catalyst with a high specific surface area; the present invention controls the mass ratio of copper and nickel and the metal loading to improve the catalytic denitrification efficiency of the dual-activity catalyst; the present invention controls the mass ratio of copper and nickel and the catalytic reaction temperature to increase the conversion rate of the catalytic CO2 methanation reaction of the dual-activity catalyst; the present invention controls the reaction temperature and the catalytic reaction space velocity conditions to improve the COS hydrolysis conversion rate of the dual-activity catalyst.

The invention provides a method for preparing synthesis gas by electrochemical conversion of carbon dioxide, which comprises the following steps: feeding raw material gas containing carbon dioxide into a first absorption unit, absorbing by electrolyte to obtain a gas-liquid mixture, and sequentially separating by an electrochemical reactor and a separator to obtain gas-phase products of an anode and a cathode and electrolyte; the cathode gas-phase product is mixed with feed gas and then returns to the first absorption unit to obtain synthesis gas, and the anode gas-phase product enters the second absorption unit to obtain oxygen; and the obtained electrolyte is recycled in the reaction. The invention further provides a method for preparing synthesis gas through electrochemical conversion of carbon dioxide, raw material gas containing carbon dioxide is fed into the second absorption unit, the gas-liquid mixture reaction process is the same as that of the method, and the obtained anode gas-phase product is mixed with the raw material gas and returns to the second absorption unit to obtain oxygen. And the cathode gas-phase product enters a first absorption unit to obtain the synthesis gas. The method disclosed by the invention can effectively improve the purity of the product gas and the comprehensive conversion rate of carbon dioxide.

The utility model relates to the technical field of chemical catalytic reaction equipment provides a kind of for solid particle catalysis suspended state fixed bed reaction device, including reactor, solid particle catalyst layer, Reynolds number control unit and filter screen structure;Solid particle catalyst layer is filled in reactor, and its filling volume occupies 1 / 3~1 / 2 of reactor reaction zone effective volume;Reynolds number control unit is connected with reactor, and filter screen structure is arranged at the top and bottom of the reactor reaction zone.This scheme not only solves the problem of swelling blockage in the application of solid particle catalyst, prolongs the cycle of operation, and the suspended state promotes catalyst and fluid to be in full contact, prevents material short circuit, improves conversion rate, and further inhibits mechanical loss, reduces production cost.

This invention relates to the field of carbon monoxide catalyst technology, specifically to a carbon monoxide catalyst and its preparation method. The carbon monoxide catalyst is prepared by this method. The preparation method includes steps S1: mixing tetrabutyl titanate with an alcohol reagent to obtain solution a; adding an auxiliary agent to a platinum nitrate aqueous solution and mixing to obtain solution b; step S2: adding solution b dropwise to solution a and continuously stirring until a gel-like substance is formed; step S3: subjecting the gel-like substance to a first drying treatment and a first calcination treatment sequentially to obtain a powdered catalyst; step S4: grinding the powdered catalyst to a D90 < 5 μm and dispersing it in water, adding a binder to form a slurry; step S5: coating the slurry onto a porous support, and subjecting it to a second drying treatment and a second calcination treatment sequentially to obtain the carbon monoxide catalyst. The carbon monoxide catalyst prepared by this invention has good stability and can be used in complex environments.

The application provides a molecular marker related to feed conversion rate of sheep, a detection method and application thereof. Through PCR amplification and sequence analysis of a sheep GFRA2 gene, it is found that there is an A / G polymorphic site at the 196th site of the amplified fragment, further detection of the polymorphic site of 1004 Hu sheep is carried out by using KASPar primers, a least square model is established, genotype and feed conversion rate are associated, and finally it is determined that the amplified GFRA2 gene fragment can be used as a molecular marker related to feed conversion rate of sheep. The molecular marker can be used for selecting and reserving GG homozygous sheep into a core group, so as to improve the feed conversion rate of sheep and help to increase economic benefits.

The invention discloses a device and a method for synthesizing trichlorosilane from a waste contact body. A waste contact body is arranged in a transparent glass tube reaction tube, and a fixed sieve plate is arranged at the middle lower part of the reaction tube. The reaction tube is fixed in a reaction resistance furnace and is filled with organic silicon waste contact bodies, reaction gas enters from the lower end of the reaction tube after being decompressed and preheated by a steel cylinder and is subjected to a synthetic reaction with the waste contact bodies, obtained reaction products and other gas enter a cooler after being filtered by quartz wool, and condensation products are collected into a liquid collection bottle; and the non-condensable acid gas enters a tail gas absorption device. The invention provides a small-scale test device and method for synthesizing trichlorosilane from organic silicon waste contact bodies, the operation is simple, and test data has important guiding significance for engineering device construction.

The invention discloses an inner wall surface loaded honeycomb SCR denitration catalyst, and relates to the technical field of catalysts. The inner wall surface loaded honeycomb SCR denitration catalyst comprises a honeycomb carrier, the honeycomb carrier is provided with a plurality of honeycomb pore channels, and any honeycomb pore channel comprises a pore channel wall and a hollow channel; a surface layer and an inner layer are arranged on the wall of any pore channel; active components of the catalyst are loaded on the surface layer; or the active component of the catalyst is simultaneously loaded on the surface layer and the inner layer, and the concentration of the active component loaded on the surface layer is greater than that of the active component loaded on the inner layer. According to the present invention, the overall use amount of the active component can be effectively reduced, the SO2 oxidation side reaction can be reduced, the secondary pollution, the equipment blockage and other conditions can be avoided, the production cost can be easily saved, the production efficiency can be easily improved, and the product performance quality can be easily improved.

The utility model belongs to solar power supply technical field especially relates to integral type solar energy aviation obstacle light circuit system, its characterized in that, MCU microprocessor connects power module, ADC light control module, isolation module, 485 communication module and GPS communication module respectively, power module connects battery anti -overcharge module, ADC light control module, isolation module, 485 communication module, GPS communication module and boost LED drive module respectively, isolation module connects boost LED drive module, boost LED drive module connects LED lamp, MPPT charging module and battery anti -overcharge module are connected with battery group respectively, and MPPT charging module still connects photovoltaic cell. The utility model has the beneficial effects that: adopt integral type solar power supply structure, reduce the problem of installation link, can be applicable to multiple use environment, can be compatible with multiple types photovoltaic cell panel, battery power supply, realize the protection of battery, also can control multiple types, quantity's LED lamps and lanterns.

The invention discloses a preparation method of an inner wall surface loaded honeycomb SCR denitration catalyst, and relates to the technical field of catalysts. The preparation method of the inner wall surface loaded honeycomb SCR denitration catalyst comprises the following steps: preparing the carrier, loading, drying and calcining. The carrier part of the catalyst product does not contain or contains a small amount of active substances, the production efficiency is high, and the product qualification rate is high; an additional calcining process is not needed; according to the present invention, the active component is loaded on the inner wall surface of the honeycomb pore channel of the honeycomb carrier in the permeation manner, such that the overall consumption of the active component can be effectively reduced, the SO2 oxidation side reaction can be reduced, the secondary pollution, the equipment blocking and other conditions can be avoided, and the production cost can be easily saved, the production efficiency can be easily improved, and the product performance quality can be easily improved.

The invention discloses a green preparation process of capryloyl hydroxamic acid, and relates to the technical field of fine chemical synthesis. The environment-friendly preparation process of the capryloyl hydroxamic acid at least comprises the following preparation steps: mixing and stirring hydroxylamine sulfate, sodium hydroxide and ethanol, dropwise adding ethyl caprylate, and carrying out oximation reaction to obtain a reaction mixed system; reducing the temperature of the reaction mixed system, dropwise adding concentrated sulfuric acid to adjust the pH value to 6-7, and performing solid-liquid separation to obtain sodium sulfate and capryloyl hydroximic acid mother liquor; and carrying out rotary evaporation on the capryloyl hydroxamic acid mother liquor to recover the ethanol, and carrying out fractional crystallization to obtain the capryloyl hydroxamic acid. The green preparation process of capryloyl hydroxamic acid provided by the invention has the advantages of high raw material utilization rate, strong solvent recycling reusability, high product molar yield, high purity, good chroma, light smell, good corrosion resistance, continuous production, no three wastes in the process, low temperature and normal pressure, safety, green and energy saving, and accords with the green chemical engineering concept of carbon neutralization.

The invention discloses a preparation method of 2-bromo-1-(3, 5-diisopropyl-[1, 1 '-biphenyl]-4-yl)-1H-benzo [d] imidazole, and belongs to the technical field of organic synthesis. The preparation method comprises the following steps: by taking 1, 3-diisopropyl-2-methoxybenzene as a raw material, carrying out bromination reaction on NBS (N-bromosuccinimide) and triphenylphosphine to generate 5-bromo-1, 3-diisopropyl-2-methoxybenzene; then carrying out Suzuki coupling reaction on the 3, 5-diisopropyl-1-methoxy-1, 1 '-biphenyl and phenylboronic acid under the action of a palladium catalyst and alkali to generate 3, 5-diisopropyl-1-methoxy-1, 1'-biphenyl; the preparation method comprises the following steps: reacting 3, 5-diisopropyl-[1, 1 '-biphenyl]-4-yl)-1H-benzo [d] imidazole with 2-bromo-1H-benzo [d] imidazole under the action of a phosphorus-containing organic base catalyst and lithium tert-butoxide to obtain 2-bromo-1-(3, 5-diisopropyl-[1, 1'-biphenyl]-4-yl)-1H-benzo [d] imidazole. According to the preparation method of the 2-bromo-1-(3, 5-diisopropyl-[1, 1 '-biphenyl]-4-yl)-1H-benzo [d] imidazole, disclosed by the invention, a new effective path is provided for the preparation of the 2-bromo-1-(3, 5-diisopropyl-[1, 1'-biphenyl]-4-yl)-1H-benzo [d] imidazole through direct substitution reaction of benzimidazole amido and benzyloxy.

The application provides a bacillus megaterium and application of the bacillus megaterium in preparation of nano selenium organic fertilizer for increasing selenium content of tea, and belongs to the technical field of microorganisms, wherein the bacillus megaterium NT2 is preserved in China Center for Type Culture Collection, and the preservation number is CCTCC NO:M 20251806; the bacillus megaterium NT2 has strong tolerance and reduction capacity to selenium elements, can survive in high-concentration inorganic selenium, and reduce the inorganic selenium into nano selenium, and has weak capacity to enrich arsenic, cadmium and lead; can be mixed with high-temperature calcination activated high-selenium rock powder to carry out mixed fermentation, to prepare a selenium source of nano selenium organic fertilizer, to increase the selenium content of tea while ensuring that the heavy metal content does not exceed the national standard. The bacillus megaterium provided by the application can reduce the toxicity of inorganic selenium in high-selenium rock and convert it into nano selenium, and can stably, safely and standardly produce selenium-rich tea, so that the heavy metal content of tea does not exceed the standard, and the application has a broad market prospect.

The invention provides a Cu monatomic anchoring oxygen-enriched defect TiO2 photocatalyst based on selective oxidation of light-regulated 5-hydroxymethylfurfural as well as a preparation method and application of the Cu monatomic anchoring oxygen-enriched defect TiO2 photocatalyst, and belongs to the technical field of biomass catalytic conversion. The preparation method provided by the invention comprises the following steps: dissolving terephthalic acid and a Ti precursor in a solvent I, and preparing a Ti-based metal organic framework through solvothermal reaction; the Ti-based metal organic framework is soaked in an aqueous solution of copper salt, then centrifugation and drying are conducted, and the Cu-loaded MIL-125 catalytic material is obtained; and calcining the Cu-loaded MIL-125 catalytic material to obtain the photocatalyst. The method has the advantages of mild reaction conditions, controllable product and simple process, the obtained photocatalyst can efficiently utilize light energy to realize controllable oxidation of HMF into DFF or FDCA, and the method has good application prospects and economic benefits.

The invention discloses a magnetic enhanced denitration catalyst and a preparation method and application thereof. CeO2 is used as a main active component, sodium citrate is used as a morphology regulating agent, TiO2atFe3O4 is used as a carrier, and MnFe2O4 is used as an anchoring agent and auxiliary active component. The preparation of the TiO2atFe3O4 nanosphere carrier, the synthesis of the CeO2-MnFe2O4 active component and the efficient assembly of the active component and the nanosphere carrier are realized through multiple hydrothermal and strong acid regulation and control hydrothermal methods. The catalyst is in a nanosphere shape, has high specific surface area and high catalytic activity, can efficiently remove NO in industrial flue gas, has excellent sulfur poisoning resistance, has the advantages of less loss of active components, long service life and the like, and has good economic value and wide market application prospect.

The invention provides a sulfur-resistant methane dry reforming catalyst as well as a preparation method and application thereof, the structural formula of the catalyst is Ni-coated Ni3P / NiAl-LDO, the active center of the catalyst is Ni-coated Ni3P composite nanoparticles uniformly dispersed on a NiAl-LDO carrier, and the particle size of the catalyst is 5-30nm. According to the present invention, the specific raw materials, the specific ratio and the specific preparation method are adopted to achieve the existence of the special core-shell structure in the catalyst, and the structure unexpectedly achieves the resistance to the poisoning of SO2 to Ni particles, such that the stability of the catalyst can be improved, the efficiency of converting CH4 and CO2 into the synthesis gas in the presence of SO2 is substantially improved, and the catalyst can be used for the industrial production. In addition, NiAl-LDO has very strong metal-carrier interaction, sintering of Ni in the reaction process can be inhibited, and the catalyst is more suitable for a DRM reaction needing high temperature, so that the catalyst has a great industrialization prospect; within the reaction time of 12 hours, the initial conversion rate of CH4 is less than or equal to 94, and the initial conversion rate of CO2 is less than or equal to 94.

The invention provides an advertisement flow putting method and device and a storage medium, and relates to the field of advertisement flow putting, and the method comprises the following steps: S100, data collection: obtaining a historical price, a click rate, an exposure rate and a conversion rate of a corresponding advertisement position from an advertisement server according to the type of an advertisement needing to be put; according to the method, the multiple linear regression model is adopted, various factors such as the historical price, the click rate, the exposure rate and the conversion rate of the advertisement space and the user equipment performance are comprehensively considered, a more accurate traffic prediction model is constructed, the labor intensity and risks of manual calculation of people are reduced, traffic can be predicted, and the traffic prediction efficiency is improved. In addition, the advertisement putting strategy can be adjusted through the traffic expected value, the traffic expected value is predicted by knowing the equipment performance information of the user, the possibility that the user loses and the conversion rate is reduced due to the fact that the user loads slow or lagged advertisements due to the equipment problem is reduced, the advertisement putting strategy is optimized, and the user experience is improved. And the user experience and the conversion rate are improved.

Provided herein are poultry diets comprising a phytase polypeptide or fragment thereof, wherein the diet is free or substantially free of inorganic phosphate.

The present invention relates to an air pump motor for an air mattress that is easy to dock, and belongs to the technical field of air pump motors. The air pump motor for an air mattress that is easy to dock comprises a housing, a stator and a rotor, a battery is fixedly installed inside the housing, an interface is fixedly installed on one side of the housing, and an energy-saving air replenishment mechanism comprises a first support plate, a stabilizing component, a connecting component and an air replenishment component; when rapid air replenishment is performed, the power and heat of the battery and the stator are increased synchronously, at this time, the rotor rotates, and the external airflow is synchronously input into the stator and the battery surface, and the airflow is increased to cool the stator and the battery synchronously, so as to reduce the increase in the output resistance of the battery due to the temperature increase, and the stator is reduced in conversion rate due to high temperature, so that the air pump motor is more efficient and energy-saving when in use.

The application discloses a kind of catalyst and the method for directly converting synthesis gas to prepare aromatic hydrocarbon rich in benzene (B), toluene (T), dimethyl benzene (X), belongs to synthesis gas directly preparing aromatic hydrocarbon, with synthesis gas as reaction raw material, conversion reaction is carried out on fixed bed, the catalyst is composite catalyst I+II+III, three components are mechanically mixed, and the active component of component I is metal oxide I, component II is molecular sieve, and component III is molecular sieve.Reaction process has very high BTX product yield and selectivity, and aromatic hydrocarbon selectivity can reach 50-80%, and the proportion of benzene, toluene, dimethyl benzene in aromatic hydrocarbon can reach 30-80%, while by-product methane selectivity is less than 10%, with good application prospect.