44results about How to "Continuous and stable preparation" patented technology

The present invention relates to an electrochemical method for preparing a pure-oxygen gas and an oxygen-poor gas by using an oxygen-containing gas mixture. The method comprises at least two electrolyzed-water units and power supply units corresponding to the electrolyzed-water units. Each of the power supply units comprises at least one hydrogen energy recycling power supply unit and an externally-connected power supply unit. Each of the hydrogen energy recycling power supply unit uses a hydrogen fuel battery. Each of the externally-connected power supply unit uses at least one of the following items: a solar cell, a direct methanol fuel cell, and a power supply of an external alternating-current grid. Each of the power supply units is in circuit connection with the corresponding electrolyzed-water unit separately. Hydrogen generated by all the electrolyzed-water units is output to the hydrogen fuel batteries as a fuel. Oxygen generated by the electrolyzed-water units is the required pure oxygen. A negative electrode and a positive electrode of each of the hydrogen fuel battery of each of the hydrogen energy recycling power supply units input hydrogen and an oxygen-containing gas mixture. The input hydrogen is connected to a negative positive hydrogen chamber of the electrolyzed-water unit through a pipe. Gas-liquid separation is performed on exhaust of a positive electrode side is output as oxygen-poor gas. In the present invention, high-purity oxygen can be stably and continuously prepared in low cost on an indoor site and an outdoor site.

The invention relates to a method for achieving fully-automatic and continuous preparation of a micro-balloon. The method comprises steps of: (1) pouring into samples to allow the sample to be uninterruptedly poured, wherein the samples comprise dispersion phases and continuous phases: a, detecting whether the samples reach an upper limit position in real time, if yes, stopping pouring into the samples and then entering step b, and if not, continuing to pour into the samples and executing the step a; and b, detecting whether the samples reach a lower limit position, in real time, if yes, starting to pour into the samples and returning to the step a, and if not, continuing to execute the step b; and (2) injecting the samples into a micro-flow control chip, carrying out precise control on the samples injected into a micro-channel, thereby achieving generation, transportation and combination of liquid drops, and after the liquid drops are generated, carrying out in-situ solidification to form a micro-balloon. According to the invention, through a CPU controlling injector and a switching valve, automatic extraction and pouring of liquid are achieved; it is ensured that there is liquid in the injector, thereby achieving continuous and stable preparation of the micro-balloon; and the whole process is free of manual interference, and operation parameters in an operation process can be recorded.

A method is provided of producing a liquid crystal polyester, including: preparing a liquid crystal polyester prepolymer containing a repeating unit represented by general formula (1) and a repeating unit represented by general formula (2) by melt polymerization, cooling and solidifying the prepolymer to obtain a solidified prepolymer, pulverizing the solidified prepolymer to obtain a prepolymer powder, and heating the prepolymer powder to conduct solid-phase polymerization. A liquid crystal polyester is thereby prepared having a polymerization degree higher than the prepolymer. Preparing a liquid crystal polyester is performed with a rate of temperature rise within a temperature range of from a temperature 10 DEG C. lower than a final end-point temperature of the solid-phase polymerization to the final end-point temperature of from 0.01 DEG C. / min to 0.03 DEG C. / min.

Provided is a large-scale clean preparation method for graphene, comprising: (i) preparing graphite raw material, water, foaming agent and surfactant into a suspension and stirring the suspension at a rotating speed of 300-500rpm to disperse the graphite raw material uniformly to obtain a dispersed suspension; (ii) feeding the dispersed suspension into a feed inlet (1) of a spraying device, the feed inlet communicating with a conveying chamber (2), the conveying chamber being internally provided with at least one ultrasonic probe (5); the dispersed suspension being subjected to ultrasonic treatment so that the foaming agent enters layers of graphite; the conveying chamber being internally provided with at least one air compressor (4) for pressurizing the dispersed suspension to accelerate the dispersed suspension to flow forward; the conveying chamber communicating with a drying chamber (3), and the dispersed suspension after treatment flowing into the drying chamber; and (iii) arranging a gas heating nozzle and at least one nozzle (7) at the top of the drying chamber; the dispersed suspension flowing through the nozzle and entering the drying chamber to be atomized by heated gas; the foaming agent being decomposed by heat so that interlayer spacing of graphite is increased; and after atomization and foaming, obtaining the graphene stripped off under a high-speed air flow. Preferably, at least one ultrasonic probe (6) is arranged at the nozzle. According to the method, two processes, i.e., mechanical stripping and drying, are integrated into a spray dryer and an ultrasonic device is arranged at the nozzle, thus providing graphite with a higher energy, increase the intercalating probability and improving the intercalating effect of the foaming agent. Hence, product quality is ensured and, environmental protection and no-pollution are achieved.

The invention provides a preparation method of high-molecular-weight poly(butylene succinate).Butanedioic acid and butanediol are adopted as raw materials, the product poly(butylene succinate) is formed through an oligomer forming stage, a polymer forming stage and an extrusion chain extension reaction stage in sequence, the oligomer forming stage is completed under the condition of negative pressure being 3 Kpa, the number-average molecular weight of poly(butylene succinate) finally generated after the reaction is larger than or equal to 1.0*105, and the distribution range of the molecular weight is 1.2-1.6.The preparation method is high in esterification rate, the molecular weight of the generated product is high, the distribution range of the molecular weight is narrow, no gel is generated in the reaction process, and the preparation process is easy to control.

The present invention provides a method for preventing the adhesion of deposits, which is a fluid treatment method, a thin film produced between at least two processing surfaces that are arranged opposite, can be approached and separated, and at least one of them rotates relative to the other. The fluid to be treated is mixed with the fluid to obtain a treated material, and the treated material is prevented from adhering to the above-mentioned processing surface constituting the flow path of the treated fluid. Using at least two types of fluids to be treated, including a raw material fluid containing at least one raw material and a fluid used to process the above-mentioned raw material, are arranged in opposite directions, can be approached and separated, and at least one of them is relatively opposite to the other. The fluid to be treated is mixed with the thin film fluid generated between the rotating at least two processing surfaces (1, 2) to obtain a processed raw material. At this time, by introducing the raw material fluid from the center of the processing surfaces (1, 2), the raw materials processed between the processing surfaces (1, 2) are prevented from adhering to the processing surfaces (1, 2).

The invention provides a preparation method of a vanadium containing solution. The preparation method comprises the following steps that vanadium containing lixivium is subjected to silicon removal and dealumination to obtain the vanadium containing solution and silicon removal waste residues; the silicon removal waste residues are leached through concentrated sulfuric acid to obtain an acid leaching solution; after the acid leaching solution is precisely filtered, silicon residues and an aluminum sulfate solution are obtained; and the aluminum sulfate solution and an ammonium sulfate solutionare mixed, recooling crystallization is carried out after reacting, aluminum ammonium sulfate crystals and crystallization mother liquor are obtained through second solid-liquid separation, and the crystallization mother liquor is used for replacing part or all of aluminum salt to be mixed with a silicon-chrome-silicon containing solution for silicon removal. According to the method, the siliconremoval waste residues can be subjected to resource utilization, and an aluminum ammonium sulfate product high in additional value can be obtained; meanwhile, the consumption of the aluminum salt canbe reduced, high-purity ammonium metavanadate can be prepared continuously and stably, and therefore a high-purity vanadium pentoxide product with the purity not smaller than 99.9% is prepared, and the vanadium recovery rate is increased; and the process is simple, the cost is low, and energy consumption is low.

The invention discloses a foam gel preparation device for fire prevention and extinguishing in mines, which comprises a shell (9), a liquid inlet (1) and a foam gel outlet (8) arranged at both ends of the shell, which are arranged in the shell The foaming device is arranged on the outer wall of the shell and communicated with the air inlet pipe (4) of the foaming device; it also includes a gelling agent feed pipe (6) and a gelling agent adder (12); the gelling agent adder ( 12) It is mainly composed of a circumferential feed trough (24), a discharge hole (25) and a positioning cylinder (26). The positioning cylinder is fixed on the inner wall of the housing behind the foaming device. The inner ring of the positioning cylinder forms a circumferential feed trough and gelling The agent feeding pipe is connected, and a discharge hole is arranged on the circumferential feeding groove. On the premise of not destroying the foam structure, the device makes a large amount of liquid on the foam wall form a gel, and uses the foam as a carrier to greatly increase its diffusion range in the fire prevention area. At the same time, a large amount of water will be consolidated in the gel. In the body, it will not be lost.