38results about How to "Enables continuous synthesis" patented technology

The invention discloses a continuous synthesis method of a graphene / ferrite nanocomposite. According to the synthesis method, the graphene / ferrite nanocomposite is prepared by taking graphene, sodium hydroxide aqueous solution and ferric salt solution or ferric salt solution doped with nickel salt and zinc salt and adopting a reverse co-precipitation method. By adopting the synthesis method, continuous synthesis of the nanocomposite is realized by continuous material injection and continuous magnetic separation and output of products, obtained ferrite and graphene are mixed evenly and are combined firmly, and an excellent absorbing property is achieved. Therefore the synthesis method has the advantages of continuous synthesis capability, low synthesis temperature, low energy consumption, low cost and quantity production capability, and has better application prospect.

The invention discloses a continuous synthesis method of low-carbon-chain perfluoroalkyl iodide, which comprises the following steps: (a) adding a heating medium and a catalyst in a mass ratio of 1:(0.005-0.1) into a filler tower; (b) leading the heating agent-catalyst mixture out of the bottom of the filler tower, heating by a heater through a circulating pump, returning to a circulating liquid inlet of the filler tower so that the heating agent containing the catalyst circularly flows from top to bottom in the filler tower, and meanwhile, continuously introducing pentafluoroethyliodide and tetrafluoroethylene in a volume ratio of (5-20):1 into the filler tower through the bottom to react at 200-370 DEG C; and (c) continuously leading the reaction product out of the top of the filler tower, and cooling by a condenser to obtain the low-carbon-chain perfluoroalkyl iodide. The method has the advantages of simple technique, high efficiency and favorable product composition distribution, and is safe and controllable; and the catalyst does not need to be separated and can be recycled.

The invention discloses a method for synthesizing a dihydrofuran compound containing a 1, 3-indandione spiro skeleton as shown in a formula III by using a micro-channel reaction device, which comprises the following steps: by using a 2-benzylidene-1, 3-indandione compound I and a benzoyl ethyl acetate compound II as reaction raw materials, carrying out continuous reaction by using the micro-channel reaction device to prepare the dihydrofuran compound containing a 1, 3-indandione spiro skeleton. The micro-channel reaction device comprises a feeding pump, a micro-mixer and a micro-reactor whichare sequentially connected through a pipeline. Compared with the prior art, the new dihydrofuran containing the 1, 3-indandione spiro skeleton is prepared by taking the 2benzylidene 1, 3-indandione compound as the substrate for the first time, and the method avoids multi-component reaction, uses a non-metal catalyst and a low-toxicity solvent, and is a quick, efficient, green and environment-friendly synthetic product, wherein R1 is selected from halogenated benzene, C1-C4 alkyl benzene, C1-C4 alkoxy benzene, nitrobenzene, furan or naphthalene, and R2 is selected from halogenated benzene, C1-C4 alkyl benzene, C1-C4 alkoxy benzene, nitrobenzene, furan, thiophene, pyridyl or naphthalene.

The invention relates to a reactor for preparing tetrabromoethane by addition reaction of bromine and acetylene and a synthesis process; the reactor is characterized in that: the reactor is mainly composed of a central cooling pipe, a reaction pipe filled with fillers and an outer cooling pipe; continuous synthesis of the tetrabromoethane is realized by continuous countercurrent contact reaction of the bromine and the acetylene in the reaction pipe, so as to improve the production efficiency; by adjusting the temperature and flow rate of the cooling water in the inner and outer cooling pipes, the addition reaction temperature can be controlled, the problems of safety and more by-products are solved owning to overhigh reaction temperature; by adopting the reactor and the synthesis process, the explosive mixture of acetylene and air is prevented from being formed in the reaction process, so as to improve the reaction safety.

The invention discloses a method for synthesizing a pyridine compound shown as III by using a micro-channel reaction device, which comprises the following steps: taking an alpha, beta-unsaturated ketoxime ester compound I and an N-acetyl amide compound II as reaction raw materials, adding a catalyst, and continuously reacting by using the micro-channel reaction device to prepare the pyridine compound. Compared with the prior art, the novel pyridine compound is prepared by taking the alpha, beta-unsaturated ketoxime ester compound and the N-acetyl amide compound as substrates, multi-component reaction is avoided, and the product is rapidly and efficiently synthesized by using the metal catalyst. Wherein R1 and R2 are independently selected from non-substituted or substituted phenyl, furyl, naphthyl or C1-C5 alkyl; and the substituted phenyl group is selected from phenyl groups substituted by halogen, C1-C5 alkyl groups or C1-C5 alkoxy groups.

The invention discloses a method for synthesizing gamma-butyrolactone containing a spiro 1, 3-indandione structure by using a micro-channel reaction device. The method comprises the following steps: (1) dissolving a 2-benzal-1,3-indandione compound and malonic acid cyclic (sub)isopropyl ester in an organic solvent to prepare a homogeneous solution A; (2) dissolving a catalyst and an oxidant in anorganic solvent to prepare a homogeneous solution B; (3) respectively pumping the homogeneous solution A and the homogeneous solution B into a micro-mixer in a micro-channel reaction device at the same time, mixing, and introducing into a micro-reactor to carry out reactions; and (4) collecting the effluent of the micro-reactor to obtain the product. Compared with the prior art, gamma-butyrolactone containing a spiro 1,3-indandione structure is prepared by taking the 2-benzal-1,3-indandione compound as the substrate for the first time, the method avoids the use of acidic raw materials and expensive metals, and the used non-metal catalyst also has an excellent catalytic performance.

The invention provides a method for preparing silicon nitride in a sedimentation-type and self-propagating mode. The method is characterized in that a silicon-containing solid material is introduced into a sedimentation-type reactor furnace body from a solid material inlet; nitrogen is introduced into the furnace body through a gas inlet; the silicon-containing solid material and nitrogen are subjected to a self-propagating reaction in the furnace body to generate the silicon nitride; the silicon nitride settles to the bottom of the furnace body and is then output through a discharge port. According to the method for preparing the silicon nitride in the sedimentation-type and self-propagating mode provided by the invention, a sedimentation-type mode is adopted for preparation, and continuous synthesis of the silicon nitride can be realized.

The invention discloses a magnesium-silicide spiral cooling device. The magnesium-silicide spiral cooling device comprises a motor, a cooler and a spiral propeller arranged in the cooler, wherein the spiral propeller mainly comprises a hollow shaft and spiral blades arranged on the hollow shaft; a cooling water introduction pipe is arranged in the hollow shaft; a cooling water return channel is formed in a gap between the inner wall of the hollow shaft and the outer wall of the cooling water introduction pipe; the first end of the cooling water return channel is connected with a cooling waterdelivery pipe; and a front end cylinder, a multi-level cooling water jacket and a tail end cylinder are arranged outside the cooler from the second end to the first end of the cooler in turn. The magnesium-silicide spiral cooling device has the advantages that: due to the combination of the spiral propeller and the cooler, continuous cooling of high-temperature magnesium silicide powder can be realized, and continuous synthesis of magnesium silicide is facilitated; and the high-temperature magnesium silicide powder moves forward with the turnover of the spiral propeller, and therefore the heat transfer is enhanced, the cooling of the magnesium silicide powder is uniform, the cooling rate is stable and a mild expansion condition is provided so as to ensure the reaction activity of the magnesium silicide and prevent the cooled magnesium silicide from caking.

The invention discloses a synthesis method of low-carbon-chain perfluoroalkyl iodine. The synthesis method includes the steps of: continuously feeding pentafluoroethane, iodine vapor, tetrafluoroethylene and a fluorine / nitrogen gas mixture together into a tubular reactor to perform a reaction to produce a gas mixture; and alkaline-washing, drying and separating the gas mixture to prepare a mixtureof various perfluoroalkyl iodine products. In the method, molar ratio of the pentafluoroethane to the iodine vapor is 1:1-2; the molar ratio of the pentafluoroethane to the tetrafluoroethylene is 1:5-20; the molar ratio of the pentafluoroethane to the fluorine gas in the fluorine / nitrogen gas mixture is 1:0.001-1:0.01. Reaction temperature is 250-380 DEG C and reaction retention time is 1-15 s. The method has simple processes and high efficiency, is safe and controllable, and has good product component distribution.

The invention discloses a method for synthesizing aluminum nitride by a rotary kiln method. The method comprises: spraying aluminum powder from a solid powder inlet of a rotary kiln main body; introducing nitrogen from a nitrogen inlet of the rotary kiln main body; and carrying out a self-propagating reaction of nitrogen and aluminum powder in the rotary kiln main body to form the nitride. The method for synthesizing aluminum nitride by the rotary kiln method can realize massive and continuous synthesis of aluminum nitride.

The invention discloses a method for synthesizing aluminum nitride by a rotary kiln method. The method comprises: spraying aluminum powder from a solid powder inlet of a rotary kiln main body; introducing nitrogen from a nitrogen inlet of the rotary kiln main body; and carrying out a self-propagating reaction of nitrogen and aluminum powder in the rotary kiln main body to form the nitride. The method for synthesizing aluminum nitride by the rotary kiln method can realize massive and continuous synthesis of aluminum nitride.

The invention relates to a method and device for improving the synthesis efficiency of nano-diamond. The device comprises a laser generation system, a workpiece system and an auxiliary system. The spot diameter of a laser emitted by a high-powder pulse laser device is enlarged by a beam expanding mirror, two laser beams are generated after the laser is reflected and split by a beam splitter, the first laser beam passes through a focusing lens to irradiate a circularly flowing graphite water column through a light entrance, the second laser beam irradiates the graphite water column through another light entrance, graphite particles in a solution absorb laser energy and then quickly form high-temperature high-pressure plasmas, and the nanoscale diamond is generated in the extremely-short and nonequilibrium process. According to the method and device, the problems that in the nano-diamond synthesis process, the laser acting area is small, and the synthesis efficiency is low are solved, continuous synthesis at normal temperature under normal pressure is achieved, and the nano-diamond particles with good dispersity and uniform size distribution are obtained.

The invention relates to a device and a method for rapidly and continuously synthesizing multi-morphology Cs-Pb halo-cluster perovskite quantum dots. The device is characterized in that a Cs precursor injector and a lead halide precursor injector are connected to two first annular microchannels arranged in a constant-temperature oil bath through polytetrafluoroethylene connecting tubes respectively, and the two annular microchannels are connected with a micromixer arranged on a heating magnetic stirrer and then sequentially connected with a second annular microchannel and a liquid collector through the polytetrafluoroethylene connecting tubes. The polytetrafluoroethylene capillary tubes are adopted as the microchannels, stable reaction temperature and precise reaction time are provided for a reaction, the prepared perovskite quantum dots are uniform in size and have three different morphologies including spherical, rod-like and cubic morphologies, and meanwhile, the perovskite quantum dots with the fluorescence spectrum range being 395-700 nm can be synthesized rapidly by changing types and ratio of halogen elements and the reaction temperature.

The invention discloses a method for synthesizing γ-butyrolactone containing a spirocyclic 1,3-indanedione structure by using a microchannel reaction device, which comprises the following steps: (1) 2-benzylidene-1,3 Indanediones and cyclo(sub)isopropyl malonate are dissolved in an organic solvent to make a homogeneous solution A; (2) catalysts and oxidants are dissolved in an organic solvent to make a homogeneous solution B; (3) The homogeneous solution A and the homogeneous solution B are respectively simultaneously pumped into the micro-mixer in the microchannel reaction device, and after mixing, they are passed into the micro-reactor for reaction; (4) the effluent of the micro-reactor is collected to obtain final product. Compared with the prior art, the present invention uses 2-benzylidene-1,3-indandione compounds as substrates for the first time to prepare new gamma-butyrolactone containing spiro ring 1,3-indandione structure, The method avoids the use of acidic raw materials and expensive metals, and the non-metallic catalyst used also has excellent catalytic performance.

The invention belongs to the technical field of chemistry, and particularly relates to a treatment method of β-alanine by-products; first, the production waste liquid and ammonia water containing 3,3-iminodipropionate sodium are passed into a microchannel reactor respectively, and the Continuous reaction at 180-210°C for 10-30 minutes, followed by deamination, dehydration and drying treatment to obtain sodium β-alanine; the method provided by the invention has low treatment cost and high resource utilization rate.

The invention discloses a centrifugal micro-fluidic chip and a method for continuously synthesizing Janus particles. The chip consists of an upper-layer substrate, a middle-layer substrate and a lower-layer substrate, wherein an upper-layer central round hole, a circular solution tank, multiple upper-layer round dispersion channels and multiple first-level straight channels which communicate are formed in the upper-layer substrate; a middle-layer central round hole is formed in the middle-layer substrate; a central solution tank, a lower-layer round dispersion channel, multiple second-level straight channels and multiple third-level straight channels are formed in the lower-layer substrate. The method comprises steps as follows: 1) the centrifugal micro-fluidic chip is fixed on a suction cup of a spin coater; 2) different test solutions are injected into the central solution tank and the circular solution tank, the spin coater is started for spin centrifugation, and bi-phase droplets are formed at channel outlets; 3) the bi-phase droplets are spun into the external circular solution tank to form the Janus particles. With the adoption of the method, continuous introduction of the test solutions is guaranteed and continuous synthesis of the bi-phase particles is realized; the synthesis rate of the Janus particles is increased due to the arrayed synthesis channels, drive solutions rotating at the high speed and continuous synthesis.

The invention discloses a method for synthesizing silicon nitride by a rotary kiln process. The method comprises the steps: spraying siliceous powder from a solid powder charging opening in a rotary kiln main body; introducing nitrogen gas from a nitrogen gas inlet in the rotary kiln main body; and subjecting the nitrogen gas and the siliceous powder to a self-propagation reaction in the rotary kiln main body, thereby producing the silicon nitride. According to the method for synthesizing the silicon nitride by the rotary kiln process, disclosed by the invention, the mass continuous synthesisof the silicon nitride can be achieved.

The invention discloses a continuous synthesis method of a graphene / ferrite nanocomposite. According to the synthesis method, the graphene / ferrite nanocomposite is prepared by taking graphene, sodium hydroxide aqueous solution and ferric salt solution or ferric salt solution doped with nickel salt and zinc salt and adopting a reverse co-precipitation method. By adopting the synthesis method, continuous synthesis of the nanocomposite is realized by continuous material injection and continuous magnetic separation and output of products, obtained ferrite and graphene are mixed evenly and are combined firmly, and an excellent absorbing property is achieved. Therefore the synthesis method has the advantages of continuous synthesis capability, low synthesis temperature, low energy consumption, low cost and quantity production capability, and has better application prospect.

The invention relates to a sedimentation type self-propagating aluminum nitride preparation method. The method comprises the steps of introducing aluminum powder into a sedimentation type reactor furnace body from a solid material inlet; introducing nitrogen into the furnace body through a gas inlet; triggering a self-propagating reaction between the aluminum powder and the nitrogen in the furnacebody in order to generate aluminum nitride; settling the aluminum nitride to the bottom of the furnace body and then discharging the aluminum nitride through a discharge hole. The sedimentation typeself-propagating aluminum nitride synthesis method can realize the continuous synthesis of aluminum nitride and is particularly efficient and capable of saving energy for the preparation of aluminum nitride.

The invention discloses a magnesium-silicide spiral cooling device. The magnesium-silicide spiral cooling device comprises a motor, a cooler and a spiral propeller arranged in the cooler, wherein the spiral propeller mainly comprises a hollow shaft and spiral blades arranged on the hollow shaft; a cooling water introduction pipe is arranged in the hollow shaft; a cooling water return channel is formed in a gap between the inner wall of the hollow shaft and the outer wall of the cooling water introduction pipe; the first end of the cooling water return channel is connected with a cooling waterdelivery pipe; and a front end cylinder, a multi-level cooling water jacket and a tail end cylinder are arranged outside the cooler from the second end to the first end of the cooler in turn. The magnesium-silicide spiral cooling device has the advantages that: due to the combination of the spiral propeller and the cooler, continuous cooling of high-temperature magnesium silicide powder can be realized, and continuous synthesis of magnesium silicide is facilitated; and the high-temperature magnesium silicide powder moves forward with the turnover of the spiral propeller, and therefore the heat transfer is enhanced, the cooling of the magnesium silicide powder is uniform, the cooling rate is stable and a mild expansion condition is provided so as to ensure the reaction activity of the magnesium silicide and prevent the cooled magnesium silicide from caking.