43 results about "Chemical reaction engineering" patented technology

A loop reactor with a porous guide flow cylinder is applied in gas-liquid two-phase reaction or gas-liquid-solid three-phase reaction and belongs to chemical reaction engineering field. The guide flow cylinder is characterized in including an upper sealing section and a lower hole opened section. Distribution holes are opened on the hole opened section at a certain ratio, and both gas and liquid can flow out of the holes. After gas enters the guide flow cylinder through a gas distributor, gas and liquid flow out of the gas distribution holes of the hole opened section and the top of the guide flow cylinder and downwards into the guide flow cylinder from the bottom of the guide flow cylinder to form a circulation flow. Gas flowing out of the hole opened section is carried by fluid and descends to the reactor bottom. Even when the height/diameter ratio of the reactor is larger, the reactor bottom can have a high gas content. Therefore, the multi-hole guide flow cylinder breaks through a limit of a conventional circulation flow reactor on height/diameter ratio, and satisfies requirement of height/diameter ratio of a circulation flow reactor in industrial application.

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 chemical reaction engineering and particularly relates to a method for optimizing the operation of an ethylene cracking device. In the method provided by the invention, value maximization is utilized as a scale and the operation optimization scheme of a cracking furnace is formulated aiming at the constitution and market price of different raw materials and the process characteristics of the device by virtue of establishing a yield prediction model, a value prediction model and a value optimization model. After the optimization scheme provided by the invention is adopted, the optimal cracking temperature is lower than the cracking temperature obtained by the optimization scheme which is formulated by the maximum yield of principal products such as ethylene and the like; the operating period of the device is effectively prolonged; the decoking cost is lower; the separation energy consumption is reduced; the potential of the processing capability of the device is further enhanced; and the highest economic benefits are simultaneously obtained.

The invention discloses an application method of catalysts capable of synthesizing cyclic carbonate under normal temperature and atmosphere and relates to the field of chemical reaction engineering. The application method of the catalysts capable of synthesizing cyclic carbonate under the normal temperature and atmosphere includes the steps that an epoxy compound and carbon dioxide are adopted asreactants, a morpholine ionic liquid or ionic liquid crystal is adopted as the main catalyst, and a metal inorganic salt the chemical formula of which is MY is adopted as the auxiliary catalyst, wherein without presence of organic solvents, the reaction temperature is 25-40 DEG C, the reaction time is 1-24 hours, the reaction pressure is 0.1 Mpa, and the molar proportion of the reactants to the catalysts is (100:1)-(10:1); the epoxy compound and carbon dioxide are subjected to a cycloaddition reaction to obtain cyclic carbonate. The reaction conditions are mild and friendly, the reaction can be carried out under the normal temperature and pressure, the technological process is simple, and meanwhile, the morpholine ionic liquid or ionic liquid crystal is adopted as the main catalyst. Prepared cyclic carbonate is adjustable in structure, high in the stability and easy to separate and can be used repeatedly several times without changing the catalytic activity, and the auxiliary catalystand the main catalyst are low in price and high in activity.

The invention discloses a system and a method for synthesizing cyclohexanone-oxime by a micro-reactor and belongs to the field of chemical reaction engineering. The system is composed of a first micro-mixer, a second micro-mixer, a reaction pipeline provided with a heat exchange jacket and a counterbalance valve which are connected in series. The method comprises: firstly mixing slurry containing a titanium silicon molecular sieve and ammonia with a hydrogen peroxide solution by using the first micro-mixer; then dispersing cyclohexanone into the mixed slurry by using the second micro-mixer to initiate ammoximation reaction; and finally accomplishing the reaction process in the reaction pipeline. The system can achieve a high conversion rate (greater than 99%) and high selectivity (greater than 99%) within a reaction time of 0.5-20 minutes. The material stagnation amount of materials in the micro-reaction system is small, so that the controllability and the safety of ammoximation reaction are improved.

The invention of extract equip belongs to the chemical and separating technique field. The current extract equip has the flows of low rate of extracting, big tower. The invention of extract equip include: house4, moving equip1, two rounds5, liquid equip6 fixed below. Round5 is made of stings of U shape. The invention of extract equip strengthen the effect of separating, dissolve the returning, strengthen the process of mixing and separating, increase the rate of extract by times and the equip is lighter. The invention can be used in chemical industry, medical, metallurgy, and the chemical action engineering.

The invention belongs to the field of chemical reaction engineering and relates to a method for producing isopropyl acetate, in particular to a method for preparing isopropyl acetate through rectification and reaction between methyl acetate and isopropyl alcohol. By utilizing a reactive distillation column and a methyl acetate recovery tower, the isopropyl acetate is prepared and the raw material methyl acetate is recycled under normal pressure, the reactant isopropyl alcohol of high boiling point is fed into the upper portion of a reaction zone located in the middle portion of the reactive distillation column, the mixture of methyl acetate and methyl alcohol which are low in boiling point are fed into the lower portion of the reaction zone located in the middle portion of the reactive distillation column, it is guaranteed that the concentration of the methyl acetate in the liquid phase in the lower portion of the reaction zone is kept high, the concentration of the isopropyl alcohol in the liquid phase in the upper portion of the reaction zone is high, so that the concentration of the two reactants on a column plate in the whole reaction zone is kept high comparatively, meanwhile, products, namely the methyl alcohol and the methyl acetate, form the minimum azeotrope and are removed from the column top, the product, namely the isopropyl acetate, of higher boiling point is removed from the column bottom through a stripping section, and therefore the reaction equilibria can move rightward faster.

The invention belongs to the field of chemical reaction engineering and relates to a production method for isopropyl acetate, particularly an energy-saving process for preparing isopropyl acetate by reacting-distillation of methyl acetate and isopropanol. By taking methyl acetate and isopropanol as raw materials, the raw materials are prepared and recovered by reaction of a pressurized reaction rectifying tower and a normal pressure methyl acetate recovery tower, and the reaction of synthesizing isopropyl acetate in the pressurized reaction rectifying tower by virtue of a transesterification method is a pressurized reaction, so that the composition of a binary azeotrope formed by a reaction product methanol and the raw material methyl acetate is changed, the content of methyl acetate in the azeotrope is reduced, and the produced quantity at the tower top is reduced, and therefore, the equipment investment on the normal pressure methyl acetate recovery tower is reduced. The steam temperature of the binary azeotrope of methanol and methyl acetate in a rectifying section at the tower top of the pressurized reaction rectifying tower is enhanced, heat of a kettle reboiler is provided for the normal pressure methyl acetate recovery tower, and the pressurized reaction rectifying tower and the normal pressure methyl acetate recovery tower realize the purpose of saving energy and reducing consumption through heat integration.

The invention discloses a method for synthesizing piperidine through continuous liquid-phase hydrogenation of pyridine in a microreactor, and belongs to the technical field of chemical reaction engineering. According to the method, pyridine is used as a raw material, and catalytic hydrogenation is carried out under 1-5 MPa and 50-150 DEG C to obtain piperidine. According to the method, a micro-reactor hydrogenation technology is utilized, gas-liquid-solid three-phase mass transfer is enhanced, the reaction temperature and pressure conditions are milder, the reaction time is greatly shortened, and the use amount of hydrogen is lower; meanwhile, continuity and automation of the process can be realized, the energy consumption of the process is lower, the safety is higher, and the product selectivity and the conversion rate of pyridine both reach 99.5% or above.

The invention discloses a method for preparing epoxy chloropropane by cyclizing dichloropropanol in a microreactor, belonging to the technical field of chemical reaction engineering. The method comprises the following steps: quickly mixing a dichloropropanol water solution with a sodium hydroxide water solution in the microreactor; controlling the temperature of the cyclization reaction to be 40-100 DEG C; finishing reaction in a delay tube; and finally separating in a rectifying tower to obtain epoxy chloropropane. According to the method, the reaction material solutions are quickly mixed in the microreactor, so that the cyclization reaction is fully finished while side reactions caused by non-uniformly mixing are prevented and the usage amount of alkali liquor is guaranteed to be closer to the theoretical value. Compared with the traditional cyclization tower and the reactive distillation coupling technology, the method for preparing epoxy chloropropane by cyclizing dichloropropanol in the microreactor has the advantages of short material retention time, high conversion rate, high selectivity and the like, so that the production cost can be saved, the material consumption can be reduced and the byproduct amount can be decreased.

The invention discloses a preparing method and device of amorphous nanometer carbon pipe in the mutual crossing domain of coal chemical, chemical reacting engineering and charcoal material, which is characterized by the following: blending pulverized coke, coal oil and nickel powder; moulding and charring to prepare anodic coke bar of arc discharge in the buffer gas (helium or nitrogen) and other gas (acetylene or acetylene and carbon dioxide).

The invention discloses a method for inhibiting chloroform acidifying during separation of N-methylpyrolidone (NMP) and chloroform by adding a stabilizing agent, and belongs to the technical field of chemical reaction engineering. According to the method, a high-boiling-point alcohols and phenols stabilizing agent is added into the NMP/chloroform system, and gives play to effect of inhibiting acidifying during separation of NMP/chloroform. The method is capable of effectively inhibiting acidifying phenomenon during separation of NMP/chloroform and improving NMP recovery utilization efficiency, and possesses the advantages of simple operation, low cost, high safety and the like.

The invention relates to the field of chemical reaction engineering, in particular to a miniature reaction device based on a hollow foam material and application thereof. A main function area of the miniature reaction device contains the hollow foam material which is formed by macroscopically networking three-dimensionally communicated support frames; the support frames are three-dimensionally communicated hollow microchannels. All the size of the macroscopic three-dimensionally communicated pores, inner chamber size of the three-dimensionally communicated hollow microchannels and the wall thickness of the hollow microchannels in the main function area of the miniature reaction device herein are adjustable. The miniature reaction device has the advantages that efficient mass transfer and heat transfer occur in the macroscopic three-dimensionally communicated porous network, wall bodies of the hollow microchannels can effectively isolate the reaction material enriched phase and the product enriched phase during reaction, and heat generated by the reaction or required by the reaction is transferred or exchanged across the wall bodies of the hollow microchannels.

A multi-layer ring tube reactor is composed of m-layers of ring tubes, where m=2-hundreds, and heat exchanging chamber which has cylinder or dual-cylinder structure for containing said ring tubes, upper and lower sealing covers, and inlet and outlet of heat or cold medium. Said ring tube has top and bottom holes. The relative top holes of lower ring tube are communicated to the bottom holes of upper ring tube. Its advantages are simple structure, low cost, and high heat exchange efficiency.

The invention belongs to a cross technology field of coal chemistry, chemical reaction project, plasma science and charcoal material science. It refers to a method and device for using coal and water steam as materials to produce foam charcoal material continuously. The method sprays powder coal and high temperature steam into direct current arc plasma and produce foam charcoal material continuously, the mixing, foaming, synthesizing charring and graphitizing are all completed in one step. The device is made up of steam generating and supplying system, coal powder transmitting system, plasma generator, solid collector, gas cooling and purifying system, explosion protection device, system pressure adjusting system and draught fan. The invention can be operated conveniently; it can be controlled, and can be operated continuously with low cost.

The invention relates to the technical field of chemical reaction engineering, and especially relates to a method and an apparatus for rapid hydrothermal synthesis. The apparatus comprises a power mechanism, a plurality of liquid storage devices and a reactor, the liquid storage devices are connected with the reactor through a channel transition mechanism, and the channel transition mechanism is provided with a flow rate control device; and the reactor includes a channel distribution structure and a multiple heat exchange assembly, the multiple heat exchange component uses a high temperature and high pressure hot liquid as a heat source, the multiple heat exchange assembly is composed of a plurality of pinch plates which can be vertically buckled up and down, grooves are arranged at two sides of the middle pinch plate, the grooves of the adjacent pinch plate are buckled to form a plurality of closed channels, and the channel distribution structure is communicated with the closed channels of the multiple heat exchange assembly. The apparatus has a strong heat exchange function, and can prepare nano-composite particles with various crystal phases and a complicated structure under hydrothermal conditions, and the obtained nano-composite particles can be directly used without hydrothermal aging treatment, so the process flow is obviously shortened, and the process cost of the product is reduced.

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 belongs to the technical field of chemical reaction engineering, and relates to a method and a device for continuously feeding a low-boiling material to a high-pressure device. The method comprises the following concrete steps: conveying the low-boiling material into a pressure-resistant buffer tank by means of a material storage tank; supplementing shielding gas with a certain pressure to the pressure-resistant buffer tank; enabling the low-boiling material to enter a high-pressure reaction system from the pressure-resistant buffer tank through a metering pump; when the materialstorage amount in the pressure-resistant buffer tank is reduced, repeating the previous steps to realize continuous, stable and uniform feeding. After the method and the device are adopted, the liquid feeding of the low-boiling material is realized, and continuity, stability and uniformity of feeding are guaranteed, so that the problem of pump stopping caused by bubbles generated by material vaporization is effectively reduced, and the stability of a reaction in the reactor is guaranteed.