11results about How to "Reduce inactivation" patented technology

The invention relates to an electronic-grade acetic ether production method and device based on reactive distillation-dividing wall tower distillation reinforcement. The device is composed of a reactive distillation system, an alcohol ester recovery tower system, an acetic ether concentration system and an acetic ether refining dividing wall tower system. An esterification reactor of the reactive distillation system adopts strong acid ion exchange resin as a catalyst; the contents of acetic acid and ethanol in the acetic ether reaction liquid are controlled by feeding fresh ethanol and acetic acid in a reactive distillation system; and crude ethyl acetate from which water and ethanol are removed by the ethyl acetate concentration tower is subjected to light component removal and heavy component removal by an ethyl acetate refining dividing wall tower to obtain an electronic-grade ethyl acetate product. The product purity is extremely high and stable, the whole set of process is designed for obtaining electronic-grade products, the final product purity stably reaches 99.99% or above, and the requirements of the high-end electronic chemical market are met. A dividing wall tower technology is adopted, light component removal and heavy component removal processes are integrated in a single tower, the number of devices and the occupied area are reduced, and energy is saved by 20%-30% compared with a traditional process.

The invention relates to a cluster and monatomic double-active-site hydrogenation catalyst as well as a preparation method and application thereof. The hydrogenation catalyst comprises a carrier and active components loaded on the carrier, the carrier is a defective carbon carrier; the active component comprises palladium or ruthenium; the active components are uniformly dispersed on the carrier in the form of clusters and single atoms. The hydrogenation catalyst carrier prepared by the invention is high in specific surface area, contains rich nitrogen active sites, defect sites and alkaline sites, and can form coordination with active components, so that the active components form atomic-scale dispersion and high-dispersion clusters on the surface of the carrier, and efficient utilization of the active components is realized; moreover, the reaction can be performed at relatively mild temperature and pressure, so that high conversion rate of nitro-aromatic hydrogenation and high selectivity of corresponding alicyclic amine are realized, an alkaline auxiliary agent is not introduced, and the stability of the catalyst is improved.

The invention belongs to the technical field of veterinary instruments, and particularly relates to a clinical vaccination auxiliary device and method for veterinarians, the clinical vaccination auxiliary device comprises a vaccination gun and a needle tube mounted at the end of the vaccination gun, the vaccination gun is provided with a bottle seat for placing a vaccine bottle, and the bottle seat is provided with a puncture needle for puncturing the vaccine bottle; the adjusting mechanism comprises a sleeve disc which is fixedly arranged on the vaccination gun in a sleeving manner, and a connecting frame with a sliding plate is fixedly mounted on the sleeve disc; through the design of a connecting frame, a sliding plate, an adjusting plate and an adjusting groove, the length of the needle tube entering the poultry body is controllable, and the length of the needle tube penetrating into the poultry body is rapidly adjusted according to the actual requirements of different poultry. Therefore, the device adapts to the body types, day ages, fat and thin degrees and injection site differences of different poultry, and avoids the situations that vaccines cannot be effectively absorbed and immune fails due to too shallow needle insertion, or internal organs, blood vessels and nerves are damaged due to too deep needle insertion, and stress and tissue damage of the poultry is aggravated.

The invention belongs to the technical field of seawater fuel cell power generation, and particularly relates to a water circulation fuel cell power system based on seawater hydrogen production and a ship. Comprising a seawater pretreatment unit used for receiving seawater and removing impurities in the seawater; the fuel supply and mixing unit is connected with the seawater pretreatment unit and is used for mixing NaBH4 and seawater to form hydrogen fuel; the hydrogen fuel cell unit is connected with the fuel supplying and mixing unit and is used for generating hydrogen through hydrolysis reaction, converting the hydrogen into direct current and generating circulating water; the circulating unit is respectively connected with the hydrogen fuel cell unit and the fuel supplying and mixing unit and is used for feeding circulating water into the fuel supplying and mixing unit; and the power unit is connected with the hydrogen fuel cell unit and used for providing power for the ship. The seawater directly participates in the hydrolysis reaction of the sodium borohydride to start the system, and the water generated by the fuel cell is recycled, so that a'water-hydrogen-electricity 'closed loop is realized, and the energy density and the space utilization rate of the ship are improved.

This invention discloses a piezoelectric self-renewing gradient ceramic catalytic membrane and its preparation method, belonging to the field of porous ceramic technology. The method includes the preparation of a porous piezoelectric ceramic substrate, LDH transition layer modification, and catalyst electrophoretic deposition. The catalyst electrophoretic deposition method involves dispersing the catalyst in a solvent, adjusting the suspension to make the catalyst particle surface positively charged, obtaining a catalyst suspension; using a ceramic substrate modified with a positively charged transition layer as the cathode and a graphite rod as the anode, immersing both electrodes in the catalyst suspension, controlling the distance between the two electrodes to 1.4-1.6 cm, connecting a constant voltage DC power supply of 20-40V, and depositing for 5-15 minutes. After deposition, the sample is removed and subjected to post-processing and polarization treatment to obtain the catalytic ceramic membrane product. This invention utilizes fluid pressure fluctuations to excite the piezoelectric effect, achieving in-situ mechanical exfoliation and self-renewal of catalytically activated and surface-deactivated catalysts, significantly improving catalytic efficiency and long-term stability.

The application discloses a method for preparing L-serine by enzyme catalysis, and in-situ preparation of low-cost and high-activity THF is achieved by using a biological method or a chemical method; THF and enzyme inactivation are avoided by precisely controlling the flow addition of formaldehyde; the reaction system is optimized to promote the in-vivo circulation regeneration of THF, so that higher conversion efficiency is achieved with less THF feeding amount, and the use amount and cost of the expensive coenzyme THF are significantly reduced. The method is based on the optimization of the existing enzyme process, does not need complex equipment modification, and is easy to realize industrialized scale production.

This invention provides an integrated reactor for one-step ammonia production from water and nitrogen, comprising an odd number of reaction units stacked sequentially to form an integrated structure. Each reaction unit includes a sequentially stacked oxygen separation layer, a reaction layer, and an ammonia separation layer. The reaction layer comprises a Ti3AlC2MAX phase ceramic matrix and an Au-MoC / perovskite photothermal composite catalyst. An ammonia purification membrane is also provided at the ammonia collection pipe junction. This invention proposes an Au-MoC / perovskite photothermal composite catalyst for the aforementioned integrated reactor. A one-step ammonia production method from water and nitrogen is also proposed, including raw material pretreatment, a four-field resonant coupled catalytic reaction, and gas separation. This invention achieves a breakthrough improvement in reaction kinetics through four-field resonant coupling of light, electricity, heat, and flow. Compared to the traditional two / three-field superposition system, the electron-hole recombination rate is reduced to below 8%, the N≡N bond activation energy is reduced to 0.79 eV, and the ammonia equilibrium conversion rate is increased to over 95% when nitrogen is used as the nitrogen source, far exceeding existing technologies.

The application discloses a preparation method of a silicone defoaming composition, and a product and application thereof, and belongs to the technical field of defoaming agents. The method comprises the following steps: firstly, a hydroxyl MQ silicone resin and hydrophilic silicon dioxide are pretreated by being reacted under the catalysis of a catalyst tetramethylammonium hydroxide by using polydimethylsiloxane as a solvent; then, after the tetramethylammonium hydroxide is removed by being heated, a hydrogen-containing MQ silicone resin and a vinyl polyorganosiloxane are added and uniformly mixed; finally, the mixture is crosslinked under the action of a platinum catalyst to prepare the defoaming composition. The silicone defoaming composition prepared by the method has the advantages of excellent defoaming performance and easy emulsification, and is particularly suitable for defoaming treatment of pulp black liquor.

The invention discloses a core-shell structure catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The core-shell structure catalyst is successfully synthesized by regulating and controlling the core-shell chemical composition and crystallization conditions. In the preparation method, the utilization of the seed crystal inhibits the influence of the core skeleton characteristics on the shell layer, and the subsequent secondary growth induces to form a shell structure which grows mutually. The catalyst prepared by the invention takes the ZSM-5 zeolite with an acidic core site as a main component and the MCM-22 zeolite with a supercage structure as a structural basis, the ZSM-5 zeolite and the MCM-22 zeolite have a synergistic effect and respectively show excellent performance in dehydrogenation, oligomerization, cyclization reaction and carbon deposition resistance of methane, and compared with a traditional catalyst, the catalyst has the advantages that the catalyst has higher catalytic activity by constructing a heterogeneous molecular sieve core-shell structure and loading the metal Mo, and the catalyst has better application prospect. According to the catalyst, the benzene yield is obviously improved, the service life is prolonged, and the carbon deposition resistance is relatively high. The prepared core-shell structure catalyst not only serves MDA, but also can be expanded to other high-temperature acid catalytic reactions, and industrialization and process integration are promoted.

The invention discloses a freeze-drying protective agent of an infectious laryngotracheitis recombinant fowlpox virus genetic engineering vaccine as well as a preparation method and application of the freeze-drying protective agent, and belongs to the technical field of veterinary biological products. In order to reduce the virus loss of the avian infectious laryngotracheitis recombinant fowlpox virus genetic engineering vaccine in the freeze-drying process and improve the virus titer, different freeze-drying protective agent formulas and freeze-drying curves are screened, and a freeze-drying protective agent capable of reducing the virus loss of the vaccine and a matched freeze-drying process of the freeze-drying protective agent are successfully developed. The screened freeze-drying protective agent and freeze-drying curve can reduce the virus loss of the avian infectious laryngotracheitis recombinant fowlpox virus genetic engineering vaccine in the freeze-drying process, greatly improve the feather quantity contained in each bottle of vaccine, and ensure the stability of the vaccine during the vaccine storage period; the production cost can be reduced while the vaccine quality is improved, and actual production requirements are met.

The present application relates to the technical field of ganoderma lucidum spore powder processing, and particularly to a method for extracting effective components of ganoderma lucidum spore powder. The method comprises the steps of pretreatment, wall breaking treatment, degreasing treatment, concentration treatment and purification treatment. The method for extracting effective components of ganoderma lucidum spore powder has low technical difficulty, is easy to be industrialized, has simple preparation process, high wall breaking rate, and high extraction rate (above 85%) of polysaccharide, which is an effective component of ganoderma lucidum spore powder and is more easily absorbed by human body. The method effectively promotes the positive effect of the effective components of ganoderma lucidum spore powder on human body and improves the utilization rate of ganoderma lucidum spore powder.