43results about How to "Continuous and stable preparation" patented technology

This invention provides a method for preparing iminodiacetonitrile. The method comprises: reacting hydroxyacetonitrile and 95-100 wt. % liquid ammonia to obtain iminodiacetonitrile. The method has such advantages as high yield, high product quality, and continuous and stable process.

The invention relates to a method for continuous and rapid preparation of nano nickel by the microfluidics technology and belongs to the technical field of synthesis of nanomaterial by microfluidics and microreactor technology. The method includes: dissolving NiS04.6H21 into distilled water, regulating PH (power of Hydrogen) of a solution, adding a surfactant, and mixing well for configuration to obtain a nickel salt mixed solution; dissolving a reducing agent into the distilled water for configuration to obtain a reducing solution; pumping the nickel salt mixed solution and the reducing solution obtained in the above steps into a Y-shaped microreactor channel for micro-mixing reaction, and subjecting the mixed solution to cleaning, separating and vacuum low-temperature drying treatment to obtain black nickel nanoparticles. The method has the advantages of being high in mixed mass transfer rate, even in reaction, continuously stable and the like by combining the microfluidics technology; featuring in wet reduction, the nano nickel is subjected to micro-mixing in the Y-shaped microreactor channel, so that the continuous and rapid preparation of the nano nickel is realized.

The invention provides a method for preparing graphene in a screw extruder through crystal form inducing. The method comprises the steps that shearing slicing is performed on a carbon source through the screw extruder, a crystal form inducing agent is utilized, the crystal form inducing agent generates a variant along with gradual increasing of the temperature to induce the carbon source to form crystals and enable the crystals to grow along layers, the layer structure of graphite is more obvious, the layer size of the graphite exceeds 1 mm, and finally the graphene is obtained through shearing stripping of the screw extruder. Accordingly, the defect of high-temperature long-time sintering of a catalyst used in the process of graphene preparation through the carbon source is overcome, therefore, the layer structure of the graphite is complete, and then the large-size graphene with the two-dimensional area is obtained. The method has the advantages that the technology is simple, the cheap and rich raw materials are used, a chemical reaction or high synthesizing temperature is effectively prevented from being adopted, and industrial production is achieved.

A disclosed foam gel preparing apparatus for mine fire preventing and extinguishing comprises a shell (9), a liquid inlet (1) and a foam gel outlet (8) respectively arranged at the two ends of the shell, a foaming device arranged in the shell, and an air inlet pipe (4) arranged on the outer wall of the shell and communicated with the foaming device. The foam gel preparing apparatus also comprises a gelatinizing agent charging pipe (6) and a gelatinizing agent adding device (12); the gelatinizing agent adding device (12) mainly consists of a peripheral-direction charging groove (24), a discharging hole (25) and a positioning barrel (26); the positioning barrel is fixedly disposed on the inner wall of the shell and at the rear of the foaming device; the inner circle of the positioning barrel forms the peripheral-direction charging groove which is communicated with the gelatinizing agent charging pipe; and the discharging hole is arranged on the peripheral-direction charging groove. The apparatus enables a large amount of liquid on a foam wall to form gel in the premise of no damage to foam structure, and by taking foams as a carrier, the diffusion scope of the gel in the fire preventing and extinguishing area is substantially improved, and also a large amount of water is concreted in gel and does not run off.

The invention discloses a preparation method and device of nitrogen oxide. The preparation method includes following steps: preheating and mixing a nitric acid solution and a nitrite solution for reaction to generate nitrogen oxide gas, wherein nitrogen oxide is NOx, and x is greater than 1 and smaller than 2. The preparation method is easy-to-get in raw material, simple in process, easy in reaction, conducive to continuity of production operation and capable of ensuring continuous and stable supply and use of nitrogen oxide serving as an oxidant in a nuclear fuel aftertreatment plant.

The invention relates to the preparation technology of a perovskite solar cell, and specifically relates to a method for preparing the perovskite solar cell based on a one-step spraying process. The method comprises the steps of preparing a perovskite layer, wherein the preparation method of the perovskite layer comprises the steps of preparing a precursor solution; spraying a substrate with the obtained precursor solution to form a wet film; performing continuous heat treatment on the obtained wet film to obtain the perovskite layer, wherein the precursor solution comprises a precursor material and a perovskite solvent; and the perovskite solvent comprises a mixed solution of dimethyl sulfoxide and <gamma>-butyrolactone at volume ratio of 3:7 to 7:3, and isopropanol which accounts for 2.5-5% of the total volume of the solvent. The method is simple in process, high in operability and continuous and stable in preparation process; the area and thickness of the prepared battery device can be flexibly controlled, and the solar cell is high in conversion efficiency and stable; and therefore, the method provides an effective technological means for industrial production of the perovskite solar cell.

The invention provides a method for synthesizing methionine hydroxy analogue by continuous and rapid hydrolysis of 2-hydroxy-4-methylthio butyronitrile. The method comprises the following steps: feeding acid and 2-hydroxy-4-methylthio butyronitrile into a microchannel reactor loading a solid catalyst for reaction, controlling the reaction temperature to be 80 to 130 DEG C and the pressure to be 0.1 to 0.5MPa, ensuring that the residence time of a reactant in a micro channel is 1 to 10min, adding water into the mixed liquid flowing out from the microchannel reactor, continuously hydrolyzing for20 to 60min, and ensuring that the reaction temperature to be 100 to 140DEG C and the reaction pressure to be 0.1 to 0.6MPa to obtain the methionine hydroxy analogue and a small amount of a byproduct, namely ammonium sulfate. By adopting the method, continuous and rapid preparation of the methionine hydroxy analogue is reazlied, the traditional intermittent tower device is avoided, the use of inorganic acid of 50 percent is reduced, no ammonium hydroxide is needed for neutralization, no organic solvent is used, and cleaness, environmental protection and sustainability are achieved; the acidolysis time of 2-hydroxy-4-methylthio butyronitrile is greatly reduced, pyrolysis polymerization of raw materials and production of by-products are reduced, and the product quality and yield are improved.

The invention relates to a fuzzy neural network-based oxygenator pressure control method. The method comprises the following steps of: 1, constructing a fuzzy neural network controller, wherein the fuzzy neural network controller comprises an antecedent network and a seccedent network, the antecedent network comprises four layers such as an antecedent network input layer, a fuzzification layer, afuzzy rule matching layer and a normalization layer, and the seccedent network comprises three layers such as a seccedent network input layer, a rule seccedent calculation layer and a controller output layer. The fuzzy neural network-based oxygenator pressure control method combines the advantages of fuzzy control and neural network control, is used for dynamically controlling system pressure of oxygenators in real time, is capable of solving deficiencies of oxygenators working in a manner of controlling switching via time or fixing pressure limit values, and is beneficial for stably and continuously preparing high-concentration oxygen.

Belonging to the technical field of ternary battery preparation, the invention in particular relates to a method for continuous and stable preparation of a lithium battery high nickel ternary precursor. The method for continuous and stable preparation of a lithium battery high nickel ternary precursor provided by the invention carries out stepwise sinking in a high-speed rotating settling chamber,controls the composition of a synthetic precursor by continuous measurement, and sets different rotation rates in each layer of settling chamber so as to ensure the uniformity of settling particle size at each layer, utilizes high-speed rotation to realize spheroidization and controllable particle size of the high nickel ternary material, further realizes coating of low nickel with high nickel continuously, solves the defect of difficult control of the coating process at present, realizes continuous, stable and controllable preparation of high nickel precursor. The finally obtained ternary precursor has the characteristics of uniform particle size distribution, compact particles and high tap density, finally can be sintered and then applied to lithium ion batteries, and under the condition of 0.1C discharge rate, the discharge capacity is up to 296 mAh/g, and the capacity still remains at about 256 mAh/g after 200 cycles.

The invention provides a method for continuously preparing a block/star-shaped polymer on the basis of a tubular reaction device and belongs to the field of a polymer compounding method. According tothe method, a first static reactor and a second static reactor in the tubular reaction device are utilized to react; the sectional variable angle crossing blades in the first static reactor and the second static reactor and the size and connecting mode of the reactors are designed according to the characteristics of anionic polymerization reaction; a micro-channel reactor is combined with the reactors, so that the reaction speed and yield in the reaction process can be promoted; compared with intermittent kettle reaction, the reaction has the advantage that the reaction rate is increased by about 30 times; the device is capable of achieving 200 tons/year output and finally realizing the preparation for narrow distributed block/star-shaped polymer; the method is capable of realizing continuous stable production on the basis of the characteristics of the tubular reaction and promoting the product batch stability.

The invention discloses a hot sealing machine for freeze drying tablet production equipment. The hot sealing machine is characterized by comprising a control system and a stand; the stand is provided with a feed guide rail, a feed traction mechanism and an output belt with a servo traction mechanism; a coating material loading shaft for fixing a freeze drying tablet film coating material, an uncoiling mechanism and a waste coiling mechanism are arranged above the stand; and the stand is provided with a hot sealing film coating mechanism, a tear line pressing mechanism, a steel seal printing mechanism and a cutting mechanism in a product conveying direction in sequence. A transmission action of the coating material is actuated through the feed traction mechanism and the servo traction mechanism; an action of the hot sealing film coating mechanism is synchronized with a traction action; a main traction mechanism performs an interval traction motion; an auxiliary traction mechanism performs a continuous motion, and the traction speed is slightly quicker than the maximum instant speed of the main traction mechanism, but the traction force is slightly lower than the locking clamping force of the main traction mechanism; and the main traction and the auxiliary traction are used for effectively preventing the deviation of the coating material and the cutting error caused by thermal expansion and cold shrinkage of the coating material.

The invention provides a method of fast preparing graphene through microwave assisted stirring. Graphite powder is adopted as a raw material, graphite powder and a foamer are mixed, graphite is infiltrated by the foamer and then put into a high mixing machine, high speed stirring is utilized to make graphite in a complete suspension state and a high speed motion state, meanwhile, microwave stripping is adopted to aid so that the foamer among graphite layers can fast react to generate support force, and continuous, fast, environment-friendly and clean preparation of a graphene material can be achieved. According to the method of fast preparing graphene through microwave assisted stirring, the technical effect of continuous, clean and environment-friendly production of graphene is achieved, and industrialized production of graphene dry powder is promoted; further, cutting and stripping are completed through one step in the high mixing machine, graphene is scattered evenly, not only is the layer structure of graphene maintained to the greatest extent, but also the graphene material can be prepared continuously and stably, surface integrity and topological symmetry of graphene are not destroyed, and the quality of graphene finished products is ensured further.