41results about How to "Control spawn rate" patented technology

The invention provides a preparation method and an application for a CdS/BiOI heterojunction photo-catalyst. The method comprises the following steps: firstly, respectively dissolving bismuth salt material and iodine source material in glycol, mixing the two solutions and stirring for 1h; transferring a mixed solution into a reaction kettle and reacting for 8-16h at 120-200 DEG C, thereby acquiring an orange red solid; washing, drying and grinding the orange red solid, thereby acquiring dry BiOI powder; dissolving cadmium salt in deionized water, adding BiOI powder and buffer salt in turn and increasing the temperature of the reaction system from room temperature to 30-90 DEG C; adding complexing agent into the system, dropwise adding 50ml solution containing sulfur source material into the system and stirring for 15min, thereby acquiring yellow sediment; and washing, drying and grinding the yellow sediment, thereby acquiring the yellow powder, namely, the CdS/BiOI heterojunction photo-catalyst. The CdS/BiOI heterojunction photo-catalyst prepared according to the invention is used for degrading the organic pollutants in water. Compared with the photo-catalysts, such as, commercial TiO2 (P25), pure phase CdS and pure phase BiOI, the catalyst has higher visible-light catalytic activity.

The invention discloses a hydrophobic surface dropwise condensation capillary force pickup and vibration control micro-object operation device and method and relates to a micron-order object operation and micro-assembling technology. The problems that in the prior art, according to a capillary force operation mode, liquid drops remaining at the tail end after a probe is used for dipping are used as operation conditions, the size of the operation liquid drops cannot be controlled effectively, liquid drops which are too large or too small can cause operation task failure, dynamic control over the operation liquid drops after pickup cannot be achieved, and due to the leading role of adhesive force, micro objects adhere to the tail end of the probe after liquid drop disappearing and cannot fall off smoothly are solved. The device comprises a displacement control mechanism, a cooling working operation mechanism and four connecting studs. The displacement control mechanism comprises a vibration isolation table, a three-axis precision electric displacement platform, a connecting bottom plate, a manual displacement lifting table, a vibration module connecting plate, a micrometer head, a micrometer clamp, a piezoelectric ceramic vibration module and a probe clamp. The device and method are used for the field of micron-order object operation.

The invention discloses a process for continuously producing nickel hydroxide by using pickle liquor of nickel laterite ore. The process comprises the following steps of: cascade reaction in a 1# reaction kettle and a 2# reaction kettle, ageing in a 1# buffering tank, separation by a hydrocyclone and settlement by a settling groove. The nickel hydroxide crystal with the average particle diameter being more than 22mum and good settling separation and filtering performances is prepared from pickle liquor of the nickel laterite ore and sodium hydroxide solution by a direct precipitation method. The process disclosed by the invention has the advantages that the environmental-friendly effect is achieved, the flow is short, the efficiency is high, the cost is low and the continuous production of the nickel hydroxide can be realized.

The invention provides a preparation method of a lamellar ZSM-5 catalyst. Under the action of double template agents, a lamellar ZSM-5 molecular sieve is controllably synthesized by utilizing a function of each template agent. The two template agents have the respective functions: the template agent A is used for synthesizing a lamellar ultrathin molecular sieve, and the template agent B is used for growing the conventional ZSM-5 molecular sieve on the basis of the lamellar molecular sieve. The molecular sieve is characterized by being capable of adjusting and controlling the layer thickness and the Si/Al molar ratio of the lamella ZSM-5 catalyst through controlling the compositional ratio of various raw materials in a precursor solution; the synthesized molecular catalyst has high aromatic hydrocarbon selectivity and carbon deposition resistance on a B acid site, and has high catalytic stability.

The invention relates to a generation system of PAN (peroxyacetyl nitrate) standard and a method. The system comprises a reaction bin, an NO source, an acetone source and an ultraviolet lamp, wherein the reaction bin is provided with a gas inlet and a gas outlet, the acetone source is accessed in the gas inlet through a first pipeline and is connected with a first quality flow controller, and the acetone source is accessed in the gas inlet through a second pipeline and is connected with a second quality flow controller; the ultraviolet lamp is arranged outside the reaction bin, and the acetone and the NO are pumped in the reaction bin for ultraviolet irradiation. In the method, through the control of the two quality flow controllers, suitable NO and excessive acetone are pumped in the reaction bin; under the irradiation of the ultraviolet lamp, the NO fully participates in a reaction for generating the PAN so as to further calculate the concentration of the generated PAN standard according to the flow of the NO. The invention provides a PAN standard source for a PAN detector to realize online calibration, save experimental cost, lower operation complexity, and provide accurate response factors for the concentration of the PANs (peroxyacetyl nitrate standard) in atmosphere.

The invention discloses a zinc oxide coated calcium carbonate nano-material and a preparation method thereof, and belongs to the technical field of novel inorganic non-metallic materials. The preparation of a calcium carbonate@zinc oxide core-shell functional nano-powder material is researched by taking calcium carbonate nano-particles as a core, and a method for preparing CaCO3@ZnO core-shell structure composite nano-particles by combining a hydrothermal method with a heat treatment method is dislcosed. The surface of the CaCO3@ZnO core@shell structure composite nano-particle calcium carbonate prepared by the method is completely covered with zinc oxide, the zinc oxide is in a wire sheet shape, and the coating effect is good. Besides, the preparation method provided by the invention is simple, is suitable for large-scale production, and can effectively reduce the use amount of zinc resources.

The invention discloses a preparation method of pyromellitic dianhydride based on modified vanadium-titanium oxide composite catalysis. The method comprises the steps of firstly, preparing a modifiedvanadium-titanium oxide composite catalyst from sodium metavanadate and tetrabutyl titanate as raw materials by in-situ modification, melting tetramethylbenzene as a raw material by heating, filteringand introducing into a measuring tank, introducing steam to an inner coil to preserve the heat to 100-105 DEG C, filtering with a filter screen and pumping into a vaporization mixer; preheating the air to 190-200 DEG C, and then introducing the air to the vaporization mixer; reacting the preheated air with the tetramethylbenzene under the catalysis of the composite catalyst prepared above, and cooling the gas generated by the reaction through a heat exchange to obtain crude pyromellitic dianhydride; and then recrystallizing the crude pyromellitic dianhydride with acetone to obtain pyromellitic dianhydride. The method is high in reaction speed and product yield.

The invention discloses a microfluidic chip droplet generation device. The microfluidic chip droplet generation device is characterized by comprising a first electrode, a first reaction fluid accumulating bottle, a first pressure valve, an oil storage fluid accumulating bottle, a water storage fluid accumulating bottle, a second reaction fluid accumulating bottle, a second electrode, a second pressure valve, a microfluidic chip, a CCD camera, a detection unit, an impedance meter and a pulse counter. The device utilizes a gas produced in reaction as a driving force, and has the characteristics of small volume, convenience in carrying, low cost, simplicity in operation, and capability of achieving feedback control.

The invention belongs to the technical field of new energy resources, and particularly relates to an ice source heat pump system controllable in ice content. The ice source heat pump system comprisesan ice-water mixture preparation circulating module which is composed of a supercooled water heat exchanger, an ultrasonic supercooling relieving device and an ice-water mixture separation device. When the system operates, the ice content of a generated ice-water mixture is controlled by controlling working parameters of the ultrasonic supercooling relieving device, and controllable icing is achieved. According to the ice source heat pump system, limitation of a traditional water source heat pump to the fed water temperature is broken, the problem that in a traditional unit, an evaporator is iced and cannot work due to the fed water temperature is too low is solved, in addition, the ice content of the system can be controlled, it can be ensured that the system utilizes latent heat of phasechange to the greatest extent, and the situation that a pipeline is frozen and blocked due to the fact that the ice content is too high in the ice slurry conveying process is prevented.

The invention relates to silver-coated copper powder with a core-shell structure and a preparation method thereof, and belongs to the technical field of materials. The silver-coated copper powder is prepared by adopting copper powder surface treatment, a seed growth method, a heterogeneous nucleation method and a chemical plating method. Specifically, firstly, the surface of Cu is roughened by using FeCl3, seed growth is performed by adopting SnCl2 and TiCl3, and cleaning is conducted by using isopropanol; then heterogeneous nucleation is performed by using AgNO3, and a dispersing agent is added into the resulting solution for dispersing; and finally, a reducing agent, a silver nitrate solution and a complexing agent are added for chemical silver plating, and the silver-coated copper powder is obtained by washing and filtering. The method can be used for preparing the silver-coated copper powder more efficiently, and is easy to operate and suitable for industrial production, and the reaction rate is convenient to control.

The invention discloses a preparation method of an aerated brick with a high calcium-silicon ratio and the aerated brick with the high calcium-silicon ratio prepared by the preparation method, and relates to the technical field of building materials. The preparation method of the aerated brick with the high calcium-silicon ratio comprises the following steps: S1, pre-crystallization: weighing pre-crystallization raw materials, uniformly mixing the pre-crystallization raw materials, transferring the obtained mixture into a high-pressure reaction kettle, and carrying out crystallizing to obtain a calcium silicate crystallized compound; S2, mixing: weighing aerated brick powder, adding the calcium silicate crystallized compound prepared in the step S1, and carrying out uniform mixing to prepare a mixture; S3, slurrying: adding water into the mixture, performing stirring, adding aluminum powder, and continuing stirring to prepare slurry; S4, foaming and standing: injecting the slurry into a mold, conducting foaming, and performing standing to obtain a blank body; and S5, steam curing: cutting the blank body into aerated blocks, and performing steam curing to obtain the aerated brick. The preparation method of the high-calcium-silicon-ratio aerated brick has the advantage that the compressive strength of a product can be improved. The high-calcium-silicon-ratio aerated brick has the advantage of high compressive strength.

The invention discloses silicon-rich and magnesium-rich nickel slag clinker-free non-shrinking cement. The silicon-rich and magnesium-rich nickel slag clinker-free non-shrinking cement is prepared from the following components: lime, lithium slag and silicon-rich and magnesium-rich nickel slag, wherein the mass percent of the lime, the lithium slag and the silicon-rich and magnesium-rich nickel slag is 10 percent to 20 percent, 20 percent to 40 percent and 40 percent to 70 percent respectively. According to the silicon-rich and magnesium-rich nickel slag clinker-free non-shrinking cement, thelime and the lithium slag are used as an alkali activator; under a certain temperature condition, a cementing property potential of main minerals in the silicon-rich and magnesium-rich nickel slag isrealized extremely, the hydration activity is improved and a cementing material is obtained. By controlling the doping amounts of the lime and the lithium slag and reaction temperature and respectivereaction speeds of mineral components including clino-enstatite, enstatite and ferrohortonolite, so that a generation speed of Mg(OH)2 in a hydration reaction product is controlled; a principle that the volume of the Mg(OH)2 is increased by utilizing MgO in the minerals is utilized and the shrinkage performance of a cement component is controlled, so that a non-shrinking cement component is prepared; a way for greatly and sufficiently utilizing the nickel slag is provided. Moreover, a preparation technology of the clinker-free cement is simple and is easy to operate.

The invention belongs to the technical field of diphenyl carbonate production, and particularly relates to a method for controlling a byproduct anisole in diphenyl carbonate production. The method forcontrolling the byproduct anisole in diphenyl carbonate production comprises the steps: A, controlling generation of anisole: controlling the concentration of a catalyst for diphenyl carbonate production to be 700 ppm-800 ppm, wherein the average residence time of a disproportionation reaction material for diphenyl carbonate production is 5 h; and B, recovering anisole: controlling anisole in a diphenyl carbonate production system to be less than 2%, and discharging part of anisole in the system when the concentration of anisole in the system reaches 2%. According to the method, the generation rate of anisole is obviously reduced, and the generation of anisole can be effectively controlled.

The invention relates to a production method for secondary acid hydrolysis acid of dimethyl ester glyphoate acid. After condensation reacting dimethyl ester glyphoate acid, adding 31% of hydrochloric acid at twice in the condensed liquid, at first adding 45-75% of total hydrochloric acid, second, adding the remaining hydrochloric acid when the temperature reaches 105 DEG C. The invention can effectively solve the problems of insufficient production efficiency of hydrolysis kettle, higher energy consumption and low coefficient of recovery in the process of methanol recovery, enable the utilization capacity of hydrolysis kettle to be increased 25%, shorten hydrolysis time about 1 hour, and also improve 25-30% of yield of glyphoate acid when the production cost of glyphoate acid is lowered 5-10%.

The invention provides a preparation method of a proton exchange membrane fuel cell catalyst. The preparation method comprises the following steps of: mixing a noble metal halide solution and carbon black, adjusting the pH value to 2.5-10.5, and then carrying out ultrasonic wave stirring to obtain precursor liquid, wherein the noble metal halide solution is platinum halide or a mixture of platinum halide and ruthenium halide; adding the precursor liquid to a sodium borohydride solution, and carrying out ultrasonic wave stirring to obtain a mixed liquid; and standing, filtering, washing and drying the mixed liquid to obtain the proton exchange membrane fuel cell catalyst. The proton exchange membrane fuel cell catalyst prepared by the method has uniform particle size and high electrochemical performance.

The invention discloses a method for preparing hydrogen storage materials for fuel cells, which belongs to the field of fuel cells. The method includes uniformly mixing borohydride, hydroxide, water absorption materials and a catalyst. Hydrogen storage materials prepared according to the method provided by the invention have the advantages of stable property, easy storage and portability, which can control hydrogen releasing speed without filtering prepared hydrogen.