204results about How to "Precise control of reaction temperature" patented technology

The invention relates to a preparation method of a light-colored polyisocyanate curing agent. The preparation method comprises the following steps: (a) purifying a raw material-trimethylolpropane to obtain trimethylolpropane with the carbonyl compound content lower than 0.1wt%; (b) reacting trimethylolpropane with the carbonyl compound content lower than 0.1wt% or a mixture of trimethylolpropane with the carbonyl compound content lower than 0.1wt% and micromolecular dihydric alcohol with excess diisocyanate in a reactor with a conical liquid distribution plate to obtain a liquid-state prepolymer reaction solution containing excess diisocyanate; and (c) removing monomers from the prepolymer reaction solution obtained in the step (b) by adopting a two-stage film evaporator, and diluting by a solvent to obtain the curing agent with the diisocyanate monomer content lower than 0.5wt%. The color number of the diisocyanate curing agent prepared based on the method can be lower than 20Hazen.

The invention relates to a method for preparing epoxidized fatty acid methyl esters by using a microchannel reactor. The method comprises the following specific steps of: preparing catalyst formic acid and concentrated hydrochloric acid in a certain proportion; pumping fatty acid methyl ester, a formic acid catalyst, and hydrogen peroxide into the microchannel reactor by using three metering pumps; and washing reaction products, separating and drying to obtain the final product epoxidized fatty acid methyl esters. The whole process is an exothermic reaction process, and peroxyformic acid and epoxidized fatty acid methyl esters are synthesized simultaneously. When the epoxidized fatty acid methyl esters are produced by the method, the temperature of the reaction process can be controlled effectively, high safety can be guaranteed, a module is good in mixing effect, and a product obtained through reaction is high in quality; and the continuous flow reaction is performed, the process is continuous, and high production efficiency is achieved.

Provided are slurry bubble column technology for preparing ethylene through acetylene hydrogenation and a device thereof. The slurry bubble column technology includes adding water and then catalyst into a reactor, filling inert gases for replacing, heating, leading gas mixture of acetylene and hydrogen to enter in the reactor for reacting from the bottom of the reactor through a gas distributor, finally exhausting reaction products and unreacted feed gases from the top of the reactor, and separating to obtain the ethylene. The unreacted feed gases and the feed gases are mixed and then enter the reactor again for reacting. The reactor comprises a reaction gas inlet at the bottom, the gas distributor and a material liquid exhaust port, a reactor barrel body is arranged on an expended section on the upper portion of a slurry bubble column reactor, and a catalyst feeding port and a gas outlet are arranged at the top of the reactor. The slurry bubble column for preparing the ethylene through the acetylene hydrogenation is simple in structure, overcomes the phenomenon of temperature runaway in a fixed bed reactor and improves the conversion rate and selectivity of the reaction, and the operation is easy to control.

The invention belongs to the field of polyurea-based lubricating grease, and in particular provides polyurea-based lubricating grease with high mechanical stability and a preparation method thereof. The polyurea-based lubricating grease consists of the following components in percentage by weight: 70 to 90 percent of base oil and 10 to 30 percent of polyurea-based lubricating grease thickening agent, wherein the polyurea-based lubricating grease thickening agent is prepared by mixing diisocyanate and organic amine and directly thickening the base oil; isocyanate ions and amine ions have the same molar content; and the organic amine consists of fatty amine, naphthene amine and aromatic amine in the molar ratio of (2-4):(1-2):5. The polyurea-based lubricating grease has high mechanical stability and long service life.

The invention provides a reaction device for synthesizing levo terpineol and relates to a reaction device with pipe type fixed bed reactors for synthesizing the levo terpineol. The reaction device mainly comprises an evaporation kettle, a condenser and 2 to 10 pipe type fixed bed reactors connected in parallel or in series. The reaction device pushes raw materials to circularly flow between the evaporation kettle and the pipe type fixed bed reactors through evaporation natural circulation, adopts evaporation and reaction separation to contribute to precisely controlling the contact time and the reaction temperature of the raw materials and a catalyst, improving selectivity of the reaction, reducing side reactions and increasing yield, is provided with an evaporation chamber and a demister on a heating kettle to contribute to separating the raw materials from the products, reducing the levo terpineol generated by the reaction and entrained to the pipe type fixed bed reactors and improving reaction efficiency, and adopts the pipe type fixed bed reactors to contribute to reducing abrasion of catalyst granules, avoiding inactivation and prolonging service life. The reaction device effectively solves the problems of low reaction selectivity, many side reactions and low yield in the conventional synthesized levo terpineol. By the reaction device, the synthetic reaction of the levo terpineol can be performed under the best process condition; and the yield can reach over 65 percent.

The invention relates to the technical field of reaction equipment in the fields of chemical industry, pharmacy and the like, in particular to a micro-channel reaction assembly and a micro-channel reactor. The micro-channel reaction assembly comprises: branch channels which are arranged in a first layer and are used for dividing a reaction medium; a confluence channel which is arranged in the second layer and is used for confluence of the reaction medium; communicating flow channels which are arranged between the first layer and the second layer and are communicated with the branch channel andthe convergence channel. The reaction medium is divided through the branch channels and flows to the convergence channel on the second reaction plate in series through the communicating flow channelson the communicating separation plate for confluence, and sequentially reciprocates for a plurality of cycles for a reaction on the reaction medium, so that the mixing among the media can be effectively intensified. The micro-channel reaction assembly can be compatible with reactions of granular solids with a certain diameter, so that the heat transfer efficiency is higher, the mixing effect between fluids is effectively intensified, the reaction time is shortened, and the product yield is increased.

The invention belongs to the field of measurement of isotope composition in water of mineral inclusions and particularly discloses a system and a method for analyzing oxygen isotope composition in water of an oxygen-free mineral inclusion. One end of an inclusion burst extraction/purification separation/extract conversion system of the system is connected with a product collection and measurement system, and the other end of the inclusion burst extraction/purification separation/extract conversion system is connected with a waste treatment system. The method comprises steps as follows: sampling of a mineral sample; baking and vacuum degassing; bursting, extraction and purification of the mineral inclusion; conversion of the water in the mineral inclusion; collection and mass spectrometric measurement of a converted product; waste treatment of a reaction product. The problems that water extraction of the mineral inclusion is not thorough, impurity ingredient separation is not complete, oxygen isotope fractionation is easily caused in the conversion process and the like are solved, and the analysis and test accuracy and the analysis and test efficiency are improved.

The invention relates to a method for continuously producing prothioconazole by utilizing a micro-channel reactor and a micro-channel system and belongs to the technical field of organic synthesis processes. The method comprises the following steps: taking 2-(1-chloro-cyclopropyl)-1-(2-chlorphenyl)-3-hydrazino-propyl-2-ol as a raw material, carrying out a cyclization and oxidization two-step reaction in the micro-channel reactor so as to continuously complete a preparation process of prothioconazole, introducing the material into the micro-channel reactor by a metering pump, performing preheating, mixed reaction and quenching crystallization separation so as to obtain the product prothioconazole. According to the method, mass transfer and heat transfer in the reaction process can be enhanced, the reaction temperature and reaction time are accurately controlled, side reactions and a reactant auto-polymerization phenomenon caused by material enrichment in the cyclization process are avoided, and conditions that the side reactions are increased due to 'temperature runaway' and reactive oxygen species overflow in the oxidization process and the like are also avoided. The reaction timeis finally reduced, the atom utilization ratio is improved, the reaction conversion rate is greatly improved, and production of solid wastes and side reactions is reduced.

The invention provides a method for preparing nano calcium carbonate by microreaction. A device for preparing the nano calcium carbonate by the microreaction mainly comprises a thermostatic water bath, a micro reactor, a temperature controller, a constant-flux pump, a mixing tank, a stirrer, a filtrate regenerator, a mixed gas flowmeter, a nitrogen storage tank, a carbon dioxide flowmeter, a carbon dioxide storage tank, a pH value measuring instrument, a material conveying pump, a water washing filter, a dryer and corresponding connecting pipelines. By adopting a calcium carbonate microreaction carbonization process, reaction time can be greatly shortened, the yield of a nano calcium carbonate product is improved, distribution range of particle size is narrow, the quality of a product is stable, industrial production can be realized, as well as a simple process and low energy consumption are realized.

The invention belongs to the technical field of organic chemistry and particularly relates to a method for preparing a nitro compound from an aromatic hydrocarbon compound through isothermic tubular reaction. The method is characterized by comprising the following steps: adequately mixing two phases, namely a nitration raw material and mixed acid by virtue of a static mixer in a tubular reactor soas to realize simultaneous flow, reaction and heat exchange in a shell of the tubular reactor, and carrying out nitration separation, alkali washing, washing and refining, so as to obtain the nitro compound, wherein row tubes which can be controlled in different regions are arranged in the tubular reactor and are used for removing reaction heat. The method for preparing the nitro compound has thebeneficial effects that the flow is simple, the continuous production is realized, the reaction process is easy to control, the heat transfer efficiency is high, the situation that byproducts are increased due to the overheat in the reaction can be effectively avoided, the energy consumption and the raw material consumption are low, and the production process is safe and reliable.

The invention provides a circulating fluidized bed reactor for preparing hydrogen by gasifying biomass. The reactor comprises a reactor shell, a cyclone dust collector and a material returning device, wherein the reactor shell consists of a reactor upper shell, a cylindrical furnace lining and a reactor lower shell, the top part of the reactor upper shell is connected with the cyclone dust collector, the lower end of the reactor upper shell is provided with a biomass charging port, and the bottom part of reactor upper shell is muff coupled with the cylindrical furnace lining; an induction heating device is suspended in the cylindrical furnace lining, and an electric induction coil is wound outside the cylindrical furnace lining and connected with a heating power supply; the bottom part of the cylindrical furnace lining is muff coupled with the reactor lower shell, air distributors are arranged in the reactor lower shell, the bottom part of the reactor lower shell is provided with a vapor charging port, and a material returning port is arranged above the air distributors; and the bottom part of the cyclone dust collector is connected with the material returning device, the material returning device is connected with the material returning port, and the bottom part of the material returning device is provided with a material returning vapor charging port. The circulating fluidized bed reactor has the advantages of uniform heating, energy conservation and environmental protection, continuous operation, simple structure and the like, and can produce the hydrogen-enriched synthetic gas by pyrolysis of biomass materials such as stalks, rice hulls and sawdust.

The invention relates to a method for preparing active carbon by using a coke reactivity testing device. The method comprises the following steps: adding coke powder into a potassium hydroxide solution by using the coke reactivity testing device, grinding until the grain size is 0.07-0.08mm, adding coal tar and water, and heating a crucible at a temperature raising rate of 8-12 DEG C/minute; when the temperature reaches 400-410 DEG C, introducing nitrogen, wherein the flow rate of nitrogen is 1.0-1.5L/min; when the temperature reaches 850-880 DEG C, insulating for 40-60 minutes; obtaining coarse active carbon; and crushing, washing and drying the coarse active carbon to obtain active carbon. The method for preparing active carbon provided by the invention is carried out in the coke reactivity testing device which is good in tightness. The coke reactivity testing device is capable of precisely controlling the temperature raising rate and the reaction temperature, preventing the active carbon from being oxidized in the preparation process, improving the specific surface area of the active carbon, strictly controlling the change of introducing nitrogen and preventing the coke powder from being oxidized, and moreover, the rate of an activating reaction is accelerated by virtue of the flow rate of nitrogen.

The invention relates to the field of mesophase pitch production, and discloses mesophase pitch, and a continuous production method and a continuous production system thereof. The system comprises a continuous heating feeding system (7) and a pitch polymerization reaction system (8) at downstream of the continuous heating feeding system (7); a discharging port of the continuous heating feeding system is connected with a feeding port of the pitch polymerization reaction system; the continuous heating feeding system comprises a pitch melting unit (71) and a pitch heating unit (72); the pitch polymerization reaction system comprises two to eight stages of reaction kettles which are connected in series and at least one stage of standby reaction kettle; the pitch heating unit comprises spaces for holding pitch and molten salt respectively. The method comprises the following steps: melting pitch; heating to a preset temperature to form pitch melt; adding the pitch melt into the pitch polymerization reaction system to perform contact reaction; heating the molten pitch through the molten salt, wherein the polymerization reaction system comprises two to eight stages of reaction kettles which are connected in series and at least one stage of standby reaction kettle. The produced mesophase pitch is high in quality controllability, uniform in softening point and high in stability; continuous production can be realized.

The invention discloses a high-temperature emulsifier applied to oil-based drilling fluids and a preparation method of the high-temperature emulsifier, and belongs to the technical field of petroleumdrilling fluids. The high-temperature emulsifier comprises, by mass, 10-45% of fatty acid amide, 30-60% of oxidized fatty acid, 10-30% of Malay acidized tall oil fatty acid, 5-20% of rheological property regulators and 10-30% of mineral oil. The total percentage of the raw materials is 100%. The preparation method includes mixing the fatty acid amide with the oxidized fatty acid, the Malay acidized tall oil fatty acid, the rheological property regulators and the mineral oil, stirring the raw materials at the temperature of 60 DEG C for 1-2 hours of reaction, and discharging the mixture to obtain the high-temperature emulsifier. The high-temperature emulsifier has the advantages of high temperature resistance, high demulsification voltage, low filter loss, capability of stabilizing a drilling fluid system, low adding amount, convenience and effectiveness in use, convenience in popularization and application, and the like. The preparation method has the advantages of simple procedure andstep, convenience in production and greatly reduced production cost.

The invention relates to a method for continuous industrial production of coal gas by multi-chamber microwave heating. Pyrolysis chambers and gasification chambers are separated to be independent chambers, each gasification chamber is provided and connected with at least one pyrolysis chamber, and the pyrolysis chambers and the gasification chambers produce pyrolytic coal gas and gasified coal gas; the heat energy required by reactions of the pyrolysis chambers and the gasification chambers is provided by microwave energy, and the microwave power is adjustable; a raw material pushing device used in the production process comprises a semi-coke pushing device, a coal ash delivering device, a coal ash pushing device, all adopting a spiral pushing structure; the spiral pushing devices adopt speed control by frequency variation, and controls the entire reaction progress and reaction speed; and pyrolytic coal gas is used for conducting secondary heating of water vapor, and the water vapor is reheated to a temperature higher than 600 DEG C. The method provided by the invention can realize low requirements on raw materials, simple equipment, easiness in operation, continuous production of pure coal gas, and accuracy in control of coal gas components.

The invention relates to a method for continuously preparing ethylene carbonate. The method comprises the following steps: (1) mixing ethylene carbonate with a catalyst and water to obtain a catalystsolution A; (2) introducing CO2 into a reaction system, and performing back pressure regulation on the pressure of the reaction system to a required pressure by using a back pressure valve; (3) introducing the catalyst solution A and ethylene oxide into a micro-mixer, and quickly and uniformly mixing to obtain an ethylene oxide mixed solution B in which a catalyst is dissolved; (4) continuously introducing the mixed solution B and CO2 gas into a micro-mixer to obtain a gas-liquid mixture C, and enabling the gas-liquid mixture C to enter a tubular reactor for reaction; (5) introducing an obtained reaction liquid into a flash tank, and carrying out flash evaporation to separate out unreacted ethylene oxide, CO2 and water to obtain a primary product; and (6) rectifying the primary product obtained in the step (5) to obtain the product ethylene carbonate. The method is safe and efficient, and the reaction residence time is greatly shortened; the reaction efficiency is high, and the conversion rate of ethylene oxide is close to 100% in a short reaction residence time.

The invention relates to a water-cooled reactor for methanol synthesis. The reactor comprises a furnace body, and a catalyst frame and a synthetic gas collection tube which are arranged in the furnacebody; a plurality of heat exchange tubes are arranged in a catalyst bed, the synthetic gas collection tube is provided with a plurality of gas inlet holes communicated with the catalyst bed and the inner cavity of the synthetic gas collection tube, and the outlet of the synthetic gas collection tube is connected with a synthetic gas outlet; every heat exchange tube comprises an outer tube and aninner tube; the lower port of every outer tube is closed, the inner tube is inserted into the outer tube from the upper port of the outer tube, the lower port of the inner tube is close to the lower port of the outer tube and is communicated with the inner cavity of the outer tube, the upper port of the inner tube is connected with a boiler water pipeline, and the sidewall of every inner tube is provided with a plurality of through holes at intervals; a gap exists between the sidewall of the outer tube and the sidewall of the inner tube; and the upper ports of the outer tubes are connected with a steam collection tube.

The invention provides a method for preparing amyl alcohol from 2-methylfuran at room temperature by adopting a supported platinum-based catalyst. Influences of various catalyst carriers, active metals, metal loading capacity and reaction conditions (solvents, time, pressure and the like) are investigated. The acid treatment time of a 5 wt% Pt/MWNT catalyst on MWNT is 4 hours, the catalyst shows excellent activity and selectivity under the H2 pressure of 1 MPa and at the ultralow temperature of 25 DEG C, the 2-MF conversion rate is 100%, and the pentanol (POLs) yield is 53%. A brand new route is provided for synthesis of pentanol, and compared with a traditional synthesis process route, the process route is simple in preparation process, milder in reaction condition, capable of greatly reducing energy consumption and more environmentally friendly. The Pt/MWNT catalyst provided by the invention has good reusability, and shows wide potential in industrial application.