36results about How to "Narrow residence time distribution" patented technology

Evaporator apparatus (1) for the treatment of viscous media comprised of at least a feed chamber (2) having a perforated tray (3), a tube-bundle heat exchanger (4) connected thereto having perpendicularly arranged tubes (8) and a devolatilization chamber (5) connected thereto, a discharge unit (6) for the product and a vapor take-off (7) for removing volatile components, the tubes (8) of the heat exchanger (4) having a rectangular cross section over the greater part of their length.

The invention discloses a pipe reactor with a static mixing device. The pipe reactor with the static mixing device comprises a Y-shaped fluid feed port, a static mixing device, and a pipe reacting device, wherein the Y-shaped fluid feed port is provided with a fluid inlet A and a fluid inlet B, and the static mixing device comprises a jacket and an SK-type static mixer; a jacketed inlet and a jacket outlet are arranged on the jacket, and the pipe reacting device comprises a reacting device shell and a pipe reactor; a heat carrier inlet and a heat carrier outlet are arranged on the reacting device shell, and one end of the SK-type static mixer is connected with the Y-shaped fluid feed port; and the other end of the SK-type static mixer is connected with the pipe reactor. According to the pipe reactor with the static mixing device, two streams of fluids have a good mixing effect at a low flow and a flow rate, the mixing and the reaction process of the two streams of fluids are carried out at different temperatures, and part of raw material is avoided being pre-reacted, so that the mixing and the reaction process of the two streams of fluids are safer and more stable. The pipe reactor with the static mixing device is suitable for the mixing reaction process of the two streams of fluids at a low flow and a flow rate.

The invention discloses a homodromous self-cleaning double-screw extruder with a stretching function. The homodromous self-cleaning double-screw extruder with the stretching function comprises a machine barrel, a first screw and a second screw. The cross section of the first screw and the cross section of the second screw are both formed by multiple sections of circular arcs which are unequal in radius of curvature, and the cross section of the first screw and the cross section of the second screw are different in shape. The invention further provides a processing method of the homodromous self-cleaning double-screw extruder with the stretching function. According to the homodromous self-cleaning double-screw extruder with the stretching function and the processing method of the homodromous self-cleaning double-screw extruder with the stretching function, when the first screw and the second screw which are different in cross-section shape rotate in an identical direction, periodical change happens to a cross-section shape of a flow passage, so that a compression action and a squeezing action are applied on materials in the flow passage, a flowing space of the materials is compressed and expanded in a periodical mode, and therefore a chaotic mixing effect is generated, a mixing and heat transfer process is strengthened, a thermal and mechanical process which is plasticized is largely shortened, energy consumption is low, an energy-saving and consumption-reducing effect is notable.

The invention discloses a co-rotating differential multi-screw extruding machine with the gradually changing type thread number and a machining method thereof. A first threaded rod in the extruding machine comprises two single-start thread elements, three single-start-gradually-changed-to-double-start transition thread elements, a double-start thread element and three double-start-gradually-changed-to-single-start transition thread elements; and a second threaded rod comprises two double-start thread elements, three double-start-gradually-changed-to-four-start transition thread elements, a four-start thread element and three four-start-gradually-changed-to-double-start transition thread elements. According to the machining method, a threaded rod mechanism achieves five enhancement mixing mechanisms by adopting the structure of the threaded rod mechanism, and conducts all-sided enhancement mixing on materials.

The invention relates to a chip type structure catalysis multiphase microreactor which comprises a microreaction chip and a structure catalyst and comprises a gas-liquid two-phase reactant distributor, a multiphase catalysis reaction chamber, heat exchange channels on two sides of the catalysis reaction chamber and heat exchange channels on two sides of the gas-liquid two-phase reactant distributor; and gas-liquid or liquid-liquid is uniformly distributed to an inlet of a catalyst with a high-precision structure at the rear end by utilizing a dendritic distribution form and T-shaped shear mixing, and flowing heat exchange areas are respectively arranged on the upper side and the lower side of the catalytic reaction chamber. By optimizing the structural design of the reactor, the reactor has the advantages of excellent mass transfer and heat transfer characteristics, controllable reactant retention time, narrow retention time distribution, personalized design of a catalyst structure according to a reaction system, easiness in amplification and the like, and solves the bottleneck problem that a homogeneous catalyst or a fine powder catalyst is difficult to separate from a product; and the chip type structure catalysis multiphase microreactor is widely applicable to petrochemical, chemical, pharmaceutical, environmental protection, food and other fields.

The invention relates to a device and a method for continuously isomerizing epoxide, which can be used for continuous isomerizing preparation of corresponding allyl alcohol products from epoxide. Themethod comprises steps as follows: reaction raw materials and carrier gas are preheated to certain temperature, the raw materials are contacted with a regenerated catalyst and a newly supplemented catalyst in a fluidized state in a fluidized bed reactor at a certain air speed, an isomerization reaction is performed under certain pressure, reaction gas and a carbon deposit catalyst are obtained through separation in a settler, wherein reaction gas rises and enters a product separation system via a reaction liquid pipeline at the top of the settler, the carbon deposit catalyst enters a regenerator for regeneration, and the regenerated catalyst returns to a lifting pipe reactor via a regenerated catalyst pipeline. The process has the characteristics of high atom economy, product yield and selectivity and no pollution and is notably superior to a current slurry bed process.

The invention relates to a continuous synthesis method of amion-2,2,6,6-tetramentylniperidine. The method includes the following steps that triacetylamine is used as a raw material, a catalyst is added, and ammonia gas is introduced for reaction at a first channel 2 of a microchannel for 5-300 seconds at the temperature of 50-150 DEG C and the pressure of 0.3-3 Mpa; hydrogen is introduced at a second channel 2 of the microchannel, the hydrogenation temperature is 50-150 DEG C, and hydrogenation lasts for 10-300 seconds at the pressure of 0.3-3 Mpa. After gas-liquid separation, the obtained reaction liquid enters a distillation tower for distillation to obtain the finished product. According to the technical scheme, a microchannel reactor is used for hydrogenation, the shortcomings of the prior art is overcome and a safer and more convenient production way is provided.

The invention belongs to the technical field of pharmaceutical synthesis, and specifically discloses a zaltoprofen cyclization method and applications of a micro-channel reactor in a zaltoprofen cyclization process. According to the present invention, cyclization is performed in a micro-channel reactor, and the uniformly stirred material is heated to a temperature of 60-70 DEG C before the material enters the micro-channel reactor, wherein the reaction temperature is 60-90 DEG C, the flow rate is controlled at 5-10 ml/min, the pressure drop is 6 bar, the material passing time is 5-10 s, and amass ratio of a zaltoprofen intermediate II 5-(2-propionyloxy)-2-phenylthiophenylacetic acid to polyphosphoric acid to phosphoric acid is 1:3-4:0.5. According to the present invention, by using the micro-channel reactor, the cyclization yield can be substantially increased, the reaction time can be shortened, the product quality can be stabilized, the post-treatment difficulty can be substantiallyreduced, and the pollution degree can be substantially improved.

The invention discloses a gun propellant mixing and extruding device, which comprises a motor, a conic reducer, a main reducing gear, a connecting device, a feeding machine barrel, a sealing machine barrel, a gas exhauster barrel and an explosion venting machine barrel, wherein the motor is connected with the conic reducer through a coupler and a wall penetration shaft; the conic reducer is connected with the main reducing gear through the coupler; the main reducing gear is connected with a connecting device; the connecting device is connected with the feeding machine barrel; the feeding machine barrel is connected with the sealing machine barrel; the sealing machine barrel is connected with the gas exhauster barrel; the gas exhauster barrel is connected with the explosion venting machine barrel; and the sealing machine barrel is internally provided with a co-rotating twin screw. With the adoption of the gun propellant mixing and extruding device, the intermittent mixing of a gun propellant extruder is changed into the continuous mixing, and the gun propellant extruder is in enclosed environment when in processing, thus greatly improving the production efficiency and the quality of products; and the gun propellant mixing and extruding device is good in self-cleaning property, so that residence time distribution range of materials in the gun propellant mixing and extruding device is narrower, and the mixing is uniform.

The invention provides a preparation method of N, N-dimethyl-1, 3-propane diamine, which comprises the following steps: mixing acrylonitrile and a dimethylamine solution, injecting the mixture into a micro-channel reaction device for addition reaction, mixing the reaction liquid with hydrogen, preheating the mixture, feeding the preheated mixture into a continuous hydrogenation reactor filled with a Ni-based alloy hydrogenation catalyst, carrying out hydrogenation reaction and carrying out vacuum rectification separating to obtain the required product. According to the preparation method disclosed by the invention, the microchannel reactor has the advantages of continuity, high mass and heat transfer efficiency, narrow residence time distribution, no amplification effect and the like, so that the addition reaction of acrylonitrile and dimethylamine has the characteristics of high efficiency, high conversion rate and few byproducts; and the hydrogenation reaction is carried out under extremely mild reaction conditions by using the novel Ni-based alloy catalyst, and meanwhile, very high conversion rate and product selectivity are obtained, so that the whole reaction system has the advantages of continuous production, convenience in operation, high resource utilization rate and the like.

The invention discloses a method for carrying out selective nitro reduction hydrogenation reaction by using a micro-packed bed and a catalyst. Comprising the following steps: (1) mixing a reaction substrate with a reaction solvent to prepare a raw material solution; (2) introducing the raw material liquid and hydrogen into a microreactor for reaction, wherein a reaction tube of the microreactor is filled with a modified catalyst; the modified catalyst comprises a catalyst active component, a catalyst auxiliary agent and a catalyst carrier; the catalyst active component is selected from one or more of Pd, Ru and Pt; the catalyst auxiliary agent is selected from one or more of Fe, Cu, Ni and Co; the catalyst carrier is activated carbon; and (3) carrying out gas-liquid separation and purification on a gas-liquid mixture obtained after the reaction is finished to obtain a reaction product. Through the combination of the micropacked bed and the modified catalyst, nitro reduction is realized with high selectivity, the selectivity can reach 99%, and the generation of by-products is effectively reduced.