34results about How to "Easy to react" patented technology

The invention provides a method for preparing dopamine-modified hyaluronic acid micelle and belongs to the technical fields of polymer material and natural polymer. The method comprises the steps of introducing dopamine element on a hyaluronic acid main chain by amidation so as to provide certain amphipathy to the hyaluronic acid, so that micelle with the grain size of 100-700nm is formed in water solution by self-assembling. The hyaluronic acid micelle is excellent in biocompatibility, hydrophilicity and viscoelasticity, and can be applied to the fields such as biological materials and hydrophilic colloid. The adhesiveness of the dopamine provides excellent interface property, and the micelle can be applied to the fields such as emulsion, food, cosmetic and the like as emulsifier.

The present invention relates to a composite titanium dioxide nano-sheet photocatalyst, a preparation method and applications thereof, wherein the composite titanium dioxide nano-sheet photocatalyst comprises, by weight, 0.01-0.02% of carbon quantum dots, 39.44-70.73% of carbon nitride, and 29.25-60.55% of titanium dioxide. According to the present invention, titanium tetraisopropanolate and melamine are respectively adopted as the titanium source and the nitrogen source, and the precursor synthesis method is used to compound the titanium dioxide, the carbon nitride and the carbon quantum dots, wherein the carbon quantum dot mass content is extremely low while the high photocatalytic activity is provided, and the product can be used in organic wastewater treatment and hydrogen production through water photodecomposition.

The invention discloses a synthetic method of nifuratel. The synthetic method comprises the steps of carrying out a substitution reaction between epoxy chloropropane and sodium methyl mercaptide in the presence of a phase transfer catalyst to obtain epoxy propyl dimethyl sulfide, and then performing hydrazinolysis, cyclization and condensation on the obtained epoxy propyl dimethyl sulfide to obtain the nifuratel. The synthetic method is high in nifuratel yield, high in purity and low in impurity content; besides the method has the advantages that a ring-closure reaction is carried out under the alkaline condition of sodium methoxide, the use of metal sodium is avoided, production safety is ensured, and simultaneously, the reaction is easy to arouse, easy to control in process, the used raw materials are easy to get, basically no waste liquid is generated in the reaction of each step, and therefore, industrial pollution is greatly reduced; and as a result, the synthetic method of nifuratel is applicable to industrial production.

The invention discloses a preparation method of a titanium oxide film electrode based on a titanium mesh. The method comprises the following steps: (1) the titanium mesh is cut into 7.5 cm*2.8 cm, sanded by sand paper, washed with distilled water and then ultrasonically cleaned with acetone for 20 min; (2) the titanium mesh is cleaned with ethanol and the distilled water for 20 min respectively and blow-dried; (3) a Ti target is presputtered with Ar in advance; (4) a film is formed on the surface of the titanium mesh with a high-vacuum DC magnetron sputtering method, and the preparation conditions are as follows: pure Ti serves as the target, the titanium mesh serves as a substrate, the temperature of the substrate is 280 DEG C, and the distance between the target and the substrate is 8.0cm; argon serves as working gas, oxygen serves as reaction gas, and the flow ratio is 15:20; the vacuum degree is 5.0*10<-4> Pa, the working air pressure is 1.0 Pa, the sputtering power is 100 W, andthe sputtering time is 60 min; (5) the titanium mesh and the film are annealed at constant temperature for 1 h, and the titanium oxide film electrode is obtained.

Disclosed are a process device and a process method of liquid phase reaction desulfurization of sulfur dioxide and hydrogen sulfide. The process device includes a reactor and a separator. The reactorincludes a tail gas absorption zone, a liquid holding tank zone and a reaction zone. The liquid holding tank zone includes a separating plate, multiple gas lifting cylinders and a liquid down pipe andcommunicates with the tail gas absorption zone and the reaction zone. The lower part of the reaction zone is provided with at least two nozzles which are symmetrically distributed. The nozzles are obliquely fixed to the device wall of the reaction zone, and nozzle heads extends obliquely upward to the inside of the reaction zone. A liquid collection tank is arranged on the upper part of the reaction zone. A liquid phase extraction pipe is arranged at the bottom of the liquid collection tank and communicates the liquid collection tank and the separator. The other end of the separator is connected to the top of the tail gas absorption zone. Reaction gas is injected into the reactor through the nozzles to be violently mixing with a reaction solution in the reactor by using the process deviceof the invention, which greatly increases the dissolution rate and reaction rate of the gas in the reaction solution. The gas ejected from two symmetrical nozzles reacts in the reaction solution to generate sulfur, and the continuously injected gas pushes the reaction solution entrained with the sulfur to flow obliquely upward into the liquid collection tank. The solution in the reactor is alwaysin a flowing state so as to prevent the sulfur from depositing and scaling on the device wall and the bottom of the reactor to ensure safe, stable and long-term operation of the device.

The craniotomy surgical robot comprises a frame body with moving rollers, the frame body is connected with a craniotomy component through a mechanical arm, the craniotomy component comprises a mounting base, a drill bit and a sleeve, a displacement assembly is arranged in the sleeve and connected with the mounting base, and the mounting base is connected with the drill bit. The displacement assembly drives the mounting base to move in the direction away from the drill bit, an emergency stop mechanism is arranged in the drill bit, an emergency stop assembly matched with the emergency stop mechanism is arranged on the mounting base, the drill bit can be suddenly stopped through the arrangement of the emergency stop mechanism, and the pump body control unit is connected with the pump body control unit. And meanwhile, the mounting seat has a certain displacement function through the arrangement of the displacement assembly, so that the mounting seat can be displaced after the skull is drilled through, and a doctor can conveniently respond to the force.

The invention discloses a method for preparing methyl mercaptan through a reaction of methyl chloride and hydrogen sulfide. The method comprises the following steps: inflating quantitative methyl chloride and hydrogen sulfide gas into a reactor in which a catalyst is added, and performing a chemical reaction at a certain temperature and under a certain pressure, cooling after the completion of thereaction, and separating to obtain the methyl mercaptan. By the method, the gas-gas reaction is adopted, the operation is simple, a target product has high selectivity and high purity, no waste wateris produced in the process, the pollution is low and a byproduct is mainly hydrogen chloride which can be sold as a product, so that the method has a relatively great economic significance.

The invention relates to a catalytic cracking method and a system. The catalytic cracking method comprises a combined process of catalytic cracking, hydro-upgrading and aromatic hydrocarbon extraction. According to the process, benzene, methylbenzene and xylene can be co-produced while low-carbon olefin is produced to the maximum extent, and product distribution is optimized.