42results about How to "Precise control of reaction conditions" patented technology

The invention belongs to the technical field of flue gas denitration and relates to a system for denitration by spraying ammonia gas in a large-sized boiler high-temperature flue gas area. A boiler comprises a horizontal flue and a vertical flue. The system comprises an SNCR (selective non-catalytic reduction) system provided with a reducing agent injector, the reducing agent injector is a spray pipe disposed on the transverse section of the horizontal flue, an input end of the spray pipe is connected with a reducing agent conveyer, the other end of the spray pipe is closed, and the wall of the spray pipe opposite to flue gas is provided with a spray hole. The invention also discloses a denitration process for denitration treatment using the system, the denitration treatment with the system gives high denitration rate and low ammonia escape quantity as well as full flue gas purification, this product is applicable to present coal-consuming boilers for thermal power generation, iron and steel, chemicals, cements and the like, and satisfactory NOx emission index of these boilers can be ensured.

The invention provides a method for preparing vinylene carbonate through micro channel reaction. The method comprises the following steps: (1) preparing equipment, including an enhanced mass transfer micro channel reactor, a metering pump I, a metering pump II and a micro filter, wherein the enhanced mass transfer micro channel reactor comprises a preheater I, a preheater II, an ultrasonic device and a micro channel module; (2) uniformly mixing chloroethylene carbonate with an ester solvent so as to obtain a mixed liquid, synchronously inputting the preheated mixed liquid and triethylamine into a micro channel, heating, mixing, performing reaction, discharging a product obtained after the reaction is completed from a discharge valve, filtering so as to obtain a crude product, and rectifying the crude product into a rectifying still, so as to obtain the vinylene carbonate, wherein the mole ratio of the chloroethylene carbonate to the triethylamine is 1:(1.5-2.0). The method is simple, convenient and safe to operate, relatively small in quantity of byproducts, small in single solvent consumption, low in moisture content, relatively high in product purity and yield, small in environment pollution and applicable to industrial large-scale production, and continuous production can be achieved.

The invention relates to a process and equipment for preparing anisotropic rare-earth permanent-magnet powder and a product prepared thereby. The equipment for preparing the magnetic powder comprises three parts, namely a heating and magnetic field orientation system, a flow control system and a vacuum system. The preparation process comprises the following steps of: putting rare earth elements containing Sc and Y and rare earth alloy which takes boron and iron as principal components into the preparation equipment, and performing high-temperature hydrogen treatment at the temperature of between 650 and 900 DEG C under the hydrogen partial pressure of 10 to 90 kPa; and performing multi-step dehydrogenation at the temperature of between 750 and 950 DEG C under a certain magnetic field. Through the method, magnetic powder grains can be refined, and anisotropy and magnetic property are improved.

The invention belongs to the field of biomass energy utilization, and discloses a bio-oil electrochemical upgrading method which comprises the following steps: (a) mixing bio-oil, an organic solvent and a supporting electrolyte to obtain a catholyte; (b) preparing an acid solution as an anolyte; (c) constructing an electrochemical reactor by adopting the catholyte and the anolyte and separating the catholyte from the anolyte through one or two ion exchange membranes, thus forming a current loop; and (d) introducing a protective gas into one side of the catholyte, and introducing current through the working electrode and the anode electrode to carry out electrochemical reaction, thereby realizing the electrochemical upgrading of the bio-oil. Compared with the prior art, the problem that carbon deposition is easily formed when the bio-oil is upgraded by a thermochemical method can be effectively solved, the bio-oil is subjected to electrochemical upgrading under mild conditions, and thecontent of bio-oleic acid, the content of aromatic components and the content of heavy components can be reduced by upgrading, so that the bio-oil is suitable for transportation and storage; and meanwhile, carbon deposition is avoided in the upgrading process.

The present invention provides a new method for preparing o-nitro anisole by using a micro-channel reactor, particularly application of a micro-channel reactor with an enhanced mass transfer unit structure to carry out a continuous flow o-nitro chloro benzene etherification reaction. According to the present invention, the mass transfer and the heat transfer can be completed dependent on the kinetic energy of the fluid without the mechanical stirring process under the reactor operation condition higher than the normal temperature, the space time reaction rate of the micro-channel reactor can be substantially improved, the temperature fluctuation and the concentration fluctuation during the reaction process can be avoided, the phenomena such as temperature runaway and overheating do not exist, and the reaction process is safe.

The invention provides a preparation method of gold nano-octahedrons and belongs to the technical field of nanometer materials. The preparation method is provided for overcoming the defects in the prior art. The preparation method of the gold nano-octahedrons, provided by the invention, comprises the steps of selecting a cationic surfactant PDDA as a protective agent and a morphological control agent; synthesizing the gold nano-octahedrons from chloroauric acid under high temperature through one-time reduction. The preparation method has the characteristics of adopting the cationic surfactantand not introducing any new chemical components and foreign ions into the system. The preparation method is easy and convenient to operate and good in repeatability and controllability. The prepared and synthesized gold nano-octahedrons are good in monodispersity and uniform in particle size distribution. Moreover, various sizes of high-purity gold nano-octahedrons.

The invention relates to a water environment simulation reactor based on a water-soil interface. The invention belongs to the technical field of water environment research. When a simulator hydraulic retention time of the device is the same with that of a natural water body, precise controls over different hydraulic conditions and environmental factors (temperature, DO or ORP, etc.) of the simulator are realized. Water passes through a water inlet port, a water inlet area A, a control zone, a water outlet area B, and a water outlet, and contacts soil or sediments in the device, such that natural water body environment can be simulated. Compared with prior arts, the reactor provided by the invention has the advantages of simple structure, easy operation, and low running cost. The reactor can be used in laboratory researches of water-soil contaminant migration, degradation mechanism, eutrophication process, heavy metal migration, and the like, and has wide application prospect.

The invention discloses a preparation method of a pyrazole compound which is shown as a formula III. The preparation method disclosed by the invention comprises the following step of introducing a compound which is shown as a formula I and a compound which is shown as a formula II into a micro-channel reactor through different pipelines to react to obtain the pyrazole compound, wherein reaction temperature is 10 to 60 DEG C, R1 is C1-C4 alkyl, R2 and R3 are halogen independently, and R4 is methyl or phenyl. The preparation method disclosed by the invention is performed through the micro-channel reactor, has extremely-short reaction time, accurate reaction condition control and high safety, is suitable for quickly preparing products, achieves continuous production and has low cost; furthermore, the micro-channel reactor is utilized to prepare the pyrazole compound, so that reaction region selectivity is high, target compound purity is good, and the preparation method is more suitable for large-scale industrial production.

The invention provides a method for preparing 2-ethylhexyl chloroformate through continuous flow of a micro-channel reactor. According to the method, isooctanol and phosgene react by adopting the micro-channel reactor. The reaction conditions can be accurately controlled, the phosgene utilization rate is high, the reaction time is short, the yield and selectivity of 2-ethylhexyl chloroformate arehigh, and the industrial application value is relatively high.

The invention provides a method for preparing a retegravir intermediate (3R, 4R, 5R) 2 (4aminopyrrole [2, 1f] [1, 2, 4] triaza7yl) 3, 4dibenzyl 5benzyl methyl) tetrahydrofuran diol (I) by using a continuous flow reactor. The method comprises the following steps: taking a prepared negative ion solution of an intermediate pyrrole [2,1-f] [1, 2, 4] triaza4amine (III) as a material 1, taking a mixed solution of (3R, 4R, 5R) 3, 4-dibenzyl-5-(benzyl methyl) dihydrofuran-2(3H)-ketone (II), a catalyst and a solvent as a material 2, and reacting through a continuous flow reactor to synthesize a compound (I) at -20 to 0 DEG C for 50-150 seconds. the negative ion solution of the intermediate pyrrole [2,1-f] [1, 2, 4] triaza-4amine (III) is prepared by taking 7halogenated pyrrole [2,1-f] [1, 2, 4] triaza-4-amine or pyrrole [2,1-f] [1, 2, 4] triaza-4amine (IV) as a raw material and enabling the raw material, a metal reagent and the like to pass through a kettle type or continuous flow reactor. Compared with an existing conventional tank reactor, the process is short in reaction time and small in liquid holding volume, the temperature of a low-temperature reaction is increased, energy consumption is reduced, the safety of the reaction is also improved, and continuous automatic control is facilitated.

Provided are a two-source controllable SiO production system and a production method. The technical problem of low production efficiency of a traditional SiO production system can be solved. The two-source controllable SiO production system comprises a double-crucible sending heating part and a static collecting device, wherein the double-crucible sending heating part is arranged in a stainless steel vacuum cavity and comprises double crucibles and two sensing heating coils, and the two sensing heating coils are arranged outside the double crucibles respectively. The static collecting device comprises a collecting pipe and a collecting rod, wherein the inside of the collecting pipe is a static metal collecting cavity, the collecting rod is arranged in the collecting pipe, and the collecting pipe is arranged above the stainless steel vacuum cavity and communicated with the inside of the stainless steel vacuum cavity. The two-source controllable SiO production system further comprises an electric control cabinet, wherein the electric control cabinet is connected with the sensing heating coils. The two-source controllable SiO production system adopts two-source control and can accurately control reaction conditions, a silicon monoxide production period can be shortened, energy consumption can be reduced, large-scale silicon monoxide production can be achieved, and the exploratory research requirements of the scientific research institutions can be also met.

The invention provides a phosphorus-doped ternary lithium ion positive electrode material, a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: S1, dissolving a nickel source, a cobalt source, a manganese source and a phosphorus source into a solvent to obtain a mixed solution; S2, in an inert environment, enabling the mixed solution to be subjected to a staged reaction under different pH values to obtain a precursor; and S3, mixing the precursor with a lithium source, and performing sintering to obtain the phosphorus-doped ternary lithium ion positive electrode material. The phosphorus-doped ternary lithium ion positive electrode material prepared by the method is uniform in form, and no aggregation phenomenon exists among particles, so that the first charge-discharge efficiency of the lithium ion battery and the cycle performance of the battery are improved.