84results about How to "Slow down inactivation" patented technology

The invention belongs to the technical field of vaccines, and particularly relates to a vaccine freezing storage detection device and a using method. The vaccine freezing storage detection device comprises a freezing box, wherein an electric control box is mounted on one side of the freezing box; a heat dissipation hole is formed in one side of the electric control box; a motor is mounted inside the electric control box; a rotating rod is arranged at the output end of the motor; the surface of the rotating rod is connected with a vaccine mounting cylinder through threads; and a long circular hole is formed in one side of the vaccine mounting cylinder in a penetrating mode. A cold air pipe penetrates through the interior of a cold air conveying groove, an air outlet hole is attached to an opening between cold air dredging holes, the cold air dredging holes are matched with cold air outlet holes to uniformly discharge cold air to the surface of a vaccine bottle, and the vaccine mountingcylinder is driven to rotate through a transmission rod, so that on one hand, the cold air can be in uniform contact with the vaccine bottle, and on the other hand, the vaccine bottle can be conveniently taken from a box door. The device is simple in structure and flexible to use, the vaccine bottle can be effectively and uniformly frozen, and the vaccine inactivation speed is reduced.

The invention discloses a method for intensifying a carbon dioxide catalytic hydrogenation reaction. The method for intensifying the carbon dioxide catalytic hydrogenation reaction mainly comprises the following steps that active ingredients having capacity for catalyzing CO2 hydrogenation are loaded on a porous conductive framework to prepare a structural catalyst; the structural catalyst is plugged into a circuit to conduct a current; and the structural catalyst is placed in raw material gas containing CO2 and hydrogen, a power source is turned on to apply the current on the circuit, joule heat generated on the structural catalyst of the current can heat the structural catalyst to a temperature at which CO2 hydrogenation reaction can be carried out, and CO2 and hydrogen react on the structural catalyst. The current is applied on the structural catalyst of the conductive framework to realize electric internal heating, so that the catalyst is heated more uniformly, activity and sulfurpoisoning capacity of the catalyst are improved, and the conversion performance of CO2 is obviously improved.

The invention relates to a grading composition of a hydrogenation catalyst. From top to bottom, a reactor is filled with hydrodemetallization and a hydrodesulfurization catalyst; raw materials flow from top to bottom, and along with the flowing direction of raw materials, the activity of the catalyst gradually increases, the pore size gradually decreases, the grain size gradually decreases and the porosity gradually decreases; the hydrodemetallization catalyst and the hydrodesulfurization catalyst are both formed by one or more demetallization catalysts; concentrations of active metal components and acid auxiliary agents are in nonuniform distribution, and from the surface to the center of catalyst grains, the concentrations of the active metal components and acid auxiliary agents of the hydrodemetallization catalyst are of gradient increase, and the concentrations of the active metal components and acid auxiliary agents of the hydrodesulfurization catalyst are of gradient decrease; and based on weight content, the demetallization catalyst accounts for 15 to 80 percent, and the desulfurization catalyst accounts for 20 to 85 percent. The grading composition of the invention is applied to hydrogenation catalysis of oil and residual oil of heavy ends and has the advantages of possessing better activity and stability of demetallization, residual carbon removal and desulfurization,controlling temperature rise of a catalyst bed and degreasing the deactivation speed of the catalyst.

The invention relates to a catalyst for isobutane dehydrogenation production of isobutylene and a preparation method thereof. The catalyst solves the problem that the dehydrogenation catalyst prepared by the prior art has low activity and poor stability. The catalyst provided by the invention comprises, by weight, a) 0.1 to 5 parts of Pt or an oxide thereof, b) 0.1 to 5 parts of an alkaline metal or an oxide thereof, c) 0.1 to 5 parts of Sn or an oxide thereof, d) 0.1 to 10 parts of AB2O4 having a spinel structure, wherein A represents at least one divalent metal cation and B represents at least one trivalent metal cation, and e) 80 to 99 parts of a carrier Al2O3. The catalyst well solves the problem and can be used for isobutane dehydrogenation industrial production of isobutylene.

The invention provides aluminum oxide as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) reacting an aluminum source, alcohol and an initiator, and separating to obtain aluminum alkoxide; (2) adding the aluminum alkoxide obtained in the step (1) into water for hydrolysis to obtain pseudo-boehmite turbid liquid; and (3) adding an alcohol-water mixed solution and aluminum alkoxide into the pseudo-boehmite turbid liquid obtained in the step (2), keeping the concentration of the pseudo-boehmite turbid liquid unchanged, adding the pseudo-boehmite turbid liquid into an aging kettle for aging, and roasting an obtained aging product to obtain the aluminum oxide. The preparation method is simple in process, low in production cost and easy to operate, and the prepared aluminum oxide is high in crystallinity and purity, good in crystal form and controllable in structure.

The invention belongs to the field of maleic anhydride production, and particularly relates to a process and a device for producing maleic anhydride by n-butane selective oxidation. The n-butane is vaporized, heated, and mixed with an auxiliary sequentially, and then enters an air / n-butane mixer; the air is mixed with humidified steam in a humidification mixer, and heated by an air heater and thenenters the air / n-butane mixer to be mixed with the mixture of the n-butane and the auxiliary; the mixed material enters a reactor to react, and a produced gas is discharged to a next unit; the reactor is internally provided with a plurality of tubes, the tubes are filled with catalysts, and the shell pass outside each tube is divided by clapboards into a plurality of heat taking chambers which are not communicated with each other up and down; the inlet of each heat taking chamber is connected with a heat taking medium inlet tube, and the outlet of each heat taking chamber is connected with aheat taking medium outlet tube; a flow control valve is arranged between each heat taking chamber and the corresponding heat taking medium inlet pipe. The process and device provided by the inventioncan effectively prevent the local overheating of the reactor, improve the activity of the catalysts, and prolong the service life of the catalysts.

The invention relates to a graded composition of heavy oil hydrogenation catalysts. 5 to 55 percent of hydrodemetallization catalyst, 5 to 55 percent of hydrodesulfurization catalyst and 5 to 55 percent of hydrodenitrogenation catalyst are filled into a reactor from the top to the bottom respectively; along the flow direction, the activity of the catalysts is gradually increased, the aperture is gradually reduced, the granularity is gradually reduced and the porosity is gradually reduced; the active metal ingredients and the acid aid concentrations of the demetallization catalyst and the desulfurization catalyst are in non-uniform distribution, the active metal ingredient and the acid aid concentration of the demetallization catalyst are in gradient reduction, and the active metal ingredient and the acid aid concentration of the denitrogenation catalyst are in gradient increment; the active metal ingredient and the acid aid concentration of the desulfurization catalyst are in uniform distribution; the demetallization catalyst, the desulfurization catalyst and the denitrogenation catalyst consist of one or more catalysts respectively; and the demetallization, carbon residue removal, desulfurization and denitrogenation activities and stability of the catalyst graded composition system are high, and the service life is long.