37results about How to "Improve heat transfer ability" patented technology

The invention discloses a hydrogenation reaction device in a micropacked bed and a method for a hydrogenation reaction by using the same in the technical field of chemical reaction engineering. The method comprises the steps: firstly, dispersing hydrogen into a solution containing a to-be-hydrogenated substrate by a micromixer to obtain a gas-liquid mixed fluid containing micro-scale bubbles; andthen, finishing a hydrogenation process on the gas-liquid mixed fluid by a micropacked bed filled with a hydrogenation catalyst. By using the method, the high mixing efficiency and excellent mass transfer and heat transfer performances of a microreactor are utilized, the gas-liquid and liquid-solid mass transfer in a hydrogenation reaction process is enhanced, the heat transfer capacity of the reactor is remarkably improved, and the size of a hydrogenation reactor can also be remarkably reduced; the hydrogenation reaction device has the advantages of high hydrogenation efficiency, safety, controllability and simplicity in amplification and can be widely applied to the technical fields such as petroleum and petrochemicals, fine chemical engineering, medicines, environments and foods.

The invention belongs to the field of the comprehensive utilization of coke-oven gas, and discloses a novel process for making synthetic natural gas by using the coke-oven gas. The qualified synthetic natural gas product is produced by the process comprising the steps of hydrodesulfurization, carbon compensation, multi-level methanation, cooling, separation and the like. The process can effectively prevent the temperature runaway phenomenon of a methanation reactor, can reasonably distribute the load of the methanation reactor, improves the conversion rate of CO and CO2, and provides a new method for making the synthetic natural gas by using the coke-oven gas.

The invention discloses a method and equipment for preparing hydrocarbon by methyl alcohol or/ and dimethyl ether. The invention is mainly characterized in that raw material gases, such as methyl alcohol or/ and dimethyl ether and the like pass through fixed bed reaction composition equipment for catalysis to generate hydrocarbon, wherein the fixed bed reaction combination equipment is at least provided with two reaction zones, and each reaction zone is provided with a heat exchange tube set capable of independently adjusting heat exchange medium temperature; after reaction gases separate target product hydrocarbon and water by heat exchange and cooling, expect that less chillout recycle gas is mixed with raw material gas, reaction for generating target product hydrocarbon is carried out.The invention has the beneficial effects of small catalyst layer temperature difference, low recycle ratio, high synthetic ratio, small investment, high output, energy saving and consumption reduction.

Belonging to the technical field of chemical reaction, the invention particularly relates to a device for continuous synthesis of a benzylamine substance through heterogeneous hydrogenation in a micro-reactor. The device comprises: an inlet micro-mixer (1), an inlet micro-mixer (2), a micro-packed bed reactor (3) and an outlet split-phase tank (4). The device utilizes the efficient mixing and excellent mass and heat transfer performance of the micro-reactor to enhance the interphase mass transfer and heat removal capability in the reaction process, and can obviously reduce the volume of the reactor, improve the reaction yield, and enhance the production efficiency and safety. The method can solve the problems of low production efficiency, poor product purity, high device risk and the likein the hydrogenation kettle process, can realize continuous automatic operation of the process, and has the advantages of high yield, high safety and the like.

The invention belongs to the technical field of chemical reaction engineering, and relates to a method for preparing a nitro-containing oxime ester photoinitiator from an oxime ester initiator intermediate through a nitration reaction, and particularly provides a method for preparing the nitro-containing oxime ester photoinitiator through nitration in a micro-channel. According to the method, efficient mixing and excellent mass and heat transfer performance of a micro-channel are utilized, nitric acid serves as a dispersion phase in the micro-channel, an intermediate is dissolved in an inert solvent and acetic anhydride to serve as a continuous phase, the two phases are mixed to initiate a reaction, and the reaction is completed in the rear of the micro-channel. Compared with the reactionin the traditional reaction kettle, the conversion rate can be obviously improved, more importantly, the volume of the reactor can be obviously reduced, and the safety of the reaction process is improved.

The invention relates to a polyvinyl chloride, in particular to a production method of the polyvinyl chloride with a small pot suspension method, belonging to the technical field of chemical industry, characterized in that: EHP (peroxydicarbonate-diethylhexyl ester) which has high activity, uniform heat generation, and light sticking is used, based on using the EHP, a composite initiator is used, heat exchange capability of the kettle is fully utilized to allow the reaction speed to be uniform, prevent the acceleration of the post reaction speed to guarantee the timely removal of polymerization heat, and reduce the polymerization time; a composite system of binary PVA (polyvinyl alcohol) with different alcoholysis degrees and a polybasic composite system of HPMC (hydroxypropyl methyl cellulose) and PVA are used; and a secondary water injection technology is used, so that viscosity of the materials is reduced, the heat removing capability of the polymerizing pot is improved, and the quality of the PVC products is increased. According to the invention, the polymerization time is reduced, the viscosity of the materials is reduced, the cleaning time of the polymerizing pot, and a low water-oil ratio can be used for filling, so that the production capacity is improved.

The invention relates to an axial-radial reactor for synthesizing ethylene glycol by alkyl oxalate hydrogenation. The axial-radial reactor comprises a reactor body, wherein an axial-radial reaction zone is arranged in the reactor body, and an inner porous distribution barrel and an outer porous distribution barrel are arranged in the axial-radial reaction zone from inside to outside sequentially in a sleeving manner; holes I are fully distributed in the wall of the inner porous distribution barrel in the axial direction of the reactor body; holes II are formed in the end, opposite to a reaction gas inlet, of the outer porous distribution barrel in the axial direction of the reactor body; the wall, provided with the holes II, of the outer porous distribution barrel is shorter than the wall,provided with the holes I, of the inner porous distribution barrel, so that axial-radial flow and radial flow of reaction materials in a catalyst between the inner porous distribution barrel and theouter porous distribution barrel are realized. Compared with the prior art, the axial-radial reactor has the advantages that gas distribution is uniform, bed pressure drop is small, bed temperature distribution is reasonable, selectivity of ethylene glycol is high, production capacity of the reactor can be improved remarkably on the premise that diameter of the reactor is not increased, and the like.

The invention discloses a downward chilling external heat removal pulverized coal pressurized gasification device. The downward chilling external heat removal pulverized coal pressurized gasificationdevice comprises an external heat removal system, a gasification furnace casing and a pass partition plate arranged inside the gasification furnace casing, wherein the gasification furnace casing is separated by the pass partition plate into a top water wall mounting cavity and a bottom chilling chamber; the inside of the water wall mounting cavity is provided with a water wall, a gasification reaction chamber is formed inside the water wall, the inlet of an external heat removal system is communicated with the outlet of the water wall, the outlet of the external heat removal system is communicated with the inlet of the water wall, the inlet end of a burner nozzle is arranged inside the gasification furnace casing, the outlet end of the burner nozzle penetrates through the gasification furnace casing and is inserted into the gasification reaction chamber via the top of the gasification reaction chamber; circulating water inside the water wall of the downward chilling external heat removal pulverized coal pressurized gasification device is excellent in heat removal capacity, and meanwhile, the downward chilling external heat removal pulverized coal pressurized gasification device can effectively avoid various problems brought by vapor systems applied in the prior art.

The invention discloses a spiral pipe jacket type axial reactor. The spiral pipe jacket type axial reactor is characterized in that an upper seal head and a lower seal head are respectively fixedly arranged at the top part and bottom part of a cylinder body; a spiral heat exchange pipe is distributed in the axial direction of the cylinder body; an upper flat pipe plate header is communicated withthe water drain end of the spiral heat exchange pipe, and a lower flat pipe plate header is communicated with the water intake end of the spiral heat exchange pipe; the upper flat pipe plate header iscommunicated with a water collecting box, and the lower flat pipe plate header is communicated with a water distribution box; the upper flat pipe plate header and the lower flat pipe plate header arerespectively supported at the upper part and lower part of the cylinder body; both ends of a center fixed cylinder are respectively fixedly arranged on the upper flat pipe plate header and the lowerflat pipe plate header; a water jacket inner plate is covered onto the spiral heat exchange pipe along the outer wall of the spiral heat exchange pipe; a water jacket space is formed between the waterjacket inner plate and the cylinder body and is used for water to flow. The spiral pipe jacket type axial reactor has the advantage that by adopting the water jacket and spiral heat exchange pipe combination scheme, the whole catalyst bed layer can be uniformly cooled without overtemperature coking.

The invention discloses a gas-solid phase catalytic reactor comprising a housing and heat exchanging internal parts, wherein an air inlet and an air outlet are formed in the top and the bottom of the housing respectively; the heat exchanging internal parts comprise a plurality of heat exchanging pipes; two ends of each heat exchanging pipe are connected with the inner wall of the housing respectively; jackets are arranged on the outer wall of the housing at the joints; and a central heat exchanging pipe group can be arranged in the internal center of the housing as required. Due to the housing with a flange coupling end socket, the gas-solid phase catalytic reactor also can be used for reconstruction of the conventional reactors with housings. Due to the special compact pipe arranging manner, the gas-solid phase catalytic reactor has the advantages that the heat exchanging capability is high; the structure is reliable; the manufacture is convenient to manufacture and maintain; the investment is low; and the suitability for new construction and reconstruction of the reactors is high.

The invention relates to a vinyl chloride synthesis reaction process, in particular to an acetylene method vinyl chloride synthesis reaction process which comprises the following steps: (1) carrying out adiabatic catalytic reaction on mixed raw material gas A to obtain mixed gas B; and (2) carrying out isothermal catalytic reaction on the mixed gas B to obtain mixed gas C containing vinyl chloride, and enabling the mixed gas C to enter a post-treatment system. Radial and two-stage catalytic reactions are adopted, an independent raw material gas preheater is omitted, the number of devices is reduced, the device investment is saved, the reaction pressure drop is reduced, the service life of the catalyst is prolonged, meanwhile, the subsequent reaction efficiency is improved, the conversion rate is larger than 98.5%, and the selectivity is larger than 99%.

The invention discloses a shallow geothermal application technology of a passive building. The shallow geothermal application technology mainly includes preheating application and cooling application. A preheating process and a cooling process mainly include three steps: firstly, collecting outer air into an air inlet channel in the passive building, and filtering the collected air in the air inlet channel; secondly, transmitting the treated air into the passive building, and deeply burying the transmitted air into an underground ventilation pipeline, and preheating or cooling the air by the aid of formation depth and air temperature difference; thirdly, transmitting the treated air into an air supply pipeline distributed in the passive building, arranging a hot water heating coil or a direct evaporative cooler to treat the air again. According to the shallow geothermal application technology, structure is simple, the air in rooms is exchanged, the temperature of fresh air is adjusted, energy consumption is reduced, and the application technology has the advantages of low cost and energy consumption, wide application and the like in the use process.

The invention particularly relates to a flexible supporting structure for an ultralow-temperature infrared optical reflecting prism, and aims to solve the problem that the imaging quality is directly influenced by severe deformation of an optical reflecting mirror caused by large temperature difference between processing and assembling and actual working environments. The flexible supporting structure comprises a reflecting mirror base, a reflecting mirror end cover and a rubber block, wherein the reflecting mirror base is in an L shape, one side of the reflecting mirror end cover is fixedly connected with the other end of a base side support, the other side of the reflecting mirror end cover extends outwards and is kept parallel to the base of the base, the extension part is provided with the rubber block, a mounting area of the reflecting prism is formed among the rubber block, a flexible joint and the base side support, one end of the reflecting prism is connected with the flexible joint, the other end of the reflecting prism is connected with the rubber block, and the side part of the reflecting prism is connected with a vertical side beam.

The invention provides a method for one-step continuous hydrogenation synthesis of 1, 3-dimethyl-2-imidazolinone based on a fixed bed microreactor, and belongs to the technical field of chemical reaction engineering. The method comprises the following steps: firstly, mixing a substrate solution to be hydrogenated with formaldehyde to obtain a mixed solution, or adding homogeneous acid into the mixed solution, mixing with hydrogen in an inlet micromixer to obtain a gas-liquid mixed fluid, and then enabling the gas-liquid mixed fluid to pass through a micropacked bed filled with a catalyst to continuously finish a heterogeneous hydrogenation process by a one-step method. According to the method, efficient mixing and excellent mass and heat transfer performance of the microreactor are utilized, gas-liquid and liquid-solid mass transfer in the heterogeneous hydrogenation reaction process is enhanced, the heat transfer capacity of the reactor is improved, the volume of the reactor can be reduced, and the reaction yield is increased. The method can solve the problems of low production efficiency, poor product purity and high device risk in a hydrogenation kettle process, realizes continuous automatic operation of the process, and has the advantages of high yield, good safety and the like.

The invention discloses a catalyst, a reactor using the same and a method for preparing beta-phenethyl alcohol. The catalyst is a polysulfone microporous membrane supported 1, 4-dihydropyridine Hantzsch nicotinamide coenzyme model compound molecule catalyst. The tubular membrane reactor comprises a tubular shell, a reaction cavity, a catalyst clamp and heat transfer grid tubes, the tubular shell is equally divided into a plurality of cavities, the catalyst clamp fixes the catalyst, and the heat transfer grid tubes cling to the catalyst and are mounted on two surfaces of the catalyst. The catalyst can hydrogenate styrene oxide in a high-selectivity and high-yield manner under the condition of room temperature to obtain the beta-phenethyl alcohol. The reactor can timely remove reaction heat,hydrogenation of styrene oxide can be performed without solvents, and desolvent energy consumption and production cost are reduced.

The invention relates to a coupling reactor for synthesizing ethylene glycol by alkyl oxalate hydrogenation. The coupling reactor comprises an upper head, a lower head and a reactor shell arranged between the upper head and the lower head, wherein the upper head is provided with a reaction gas inlet, a refrigerant outlet and a manhole; the lower head is provided with a reaction gas outlet, a refrigerant inlet and a catalyst unloading port; a first gas distributor, an adiabatic reaction section, a second gas distributor and an axial-radial reaction section are arranged in the reactor shell fromtop to bottom sequentially. Compared with the prior art, the coupling reactor is simple and compact in overall structure, good in economic practicability, safe and stable, has the advantages that reaction gas is distributed uniformly, bed temperature distribution is reasonable, selectivity of ethylene glycol is high, and production capacity of the reactor can be improved remarkably on the premisethat diameter of the reactor is not increased, and has good industrial application prospect accordingly.