69results about How to "Constant reaction temperature" patented technology

Cyclohexasilane is used in chemical vapor deposition methods to deposit epitaxial silicon-containing films over substrates. Such methods are useful in semiconductor manufacturing to provide a variety of advantages, including uniform deposition over heterogeneous surfaces, high deposition rates, and higher manufacturing productivity. Furthermore, the crystalline Si may be in situ doped to contain relatively high levels of substitutional carbon by carrying out the deposition at a relatively high flow rate using cyclohexasilane as a silicon source and a carbon-containing gas such as dodecalmethylcyclohexasilane or tetramethyldisilane under modified CVD conditions.

The invention relates to a method for undergoing a chlorobenzene nitration reaction by using a micro-channel reactor, belonging to the technical field of application of organic synthesis. In the method, nitric acid, sulfuric acid, water and chlorobenzene are taken as initial reaction raw materials, and processes such as mixed acid preparation, mixed acid and chlorobenzene preheating, mixed acid and chlorobenzene reacting and the like are completed in a micro-channel reactor system. In the reaction, nitro-sulfuric mixed acid is taken as a nitrating agent, the effective concentration of sulfuric acid in the mixed acid is 50-90 percent, the molar ratio of the nitric acid to the sulfuric acid in the mixed acid is 1:1-1:10, the molar ratio of the chlorobenzene to the nitric acid is 1:1.0-1:2.0, the reaction temperature is 50-100 DEG C, and the reaction time is 30-120 seconds. The chlorobenzene transformation ratio is up to 97 percent, the selectivity of nitrochlorobenzene serving as a product is over 96.5 percent, and the ratio of ortho-para nitrochlorobenzene is over 0.6. A strengthened mixed micro-channel reactor adopted in the invention is particularly suitable for undergoing a continuous nitration reaction, and has the characteristics of stable temperature control and safe process.

The concrete water reducing agent of polyacrylic acid is prepared through esterification between polyglycol and acrylic acid to obtain esterified product, and the copolymerization of the esterified product with acrylic acid, 2-acrylamide-2-methyl propenyl sodium sulfonate and other sulfonate with unsaturated double bond. The concrete water reducing agent has weight average molecular weight of 20000-60000, concrete water reducing rate over 35 %, concrete compression strength raised by 100-300 % in 3 days, 40-80 % in 28 days and 30-50 % in 90 days, no loss in 2-hr slump of concrete, raised concrete placeability, etc. and is suitable for matching with flyash, slag and other active admixture to prepare high performance concrete.

A maleic anhydride series water-reducing agent for concrete is prepared through reaction between methoxy polyethanediol and maleic anhydride to generate monomethoxy polyethanediol maleate, and copolymerizing on 2-acrylamide-2-sodium methylpropyl sulfonate. Its advantages are high water-reducing effect, low content of alkali, and high flowability and low slump of concrete.

The invention discloses a self-controlling type outer irradiation photochemical reaction device which comprises a box body, a reaction system and a controlling system. The box body is divided into an upper story and a lower story. The upper box body is provided with the controlling system which is composed of a power supply protection switch, ballast, a relay and a microcomputer controller. The lower box body is provided with the reaction system which comprises a quartz reactor, a magnetic stirring device and a light source unit. The self-controlling type outer irradiation photochemical reaction device further comprises a sampling system which comprises a trace metering pump, a component accumulator, a computer time switch and a magnetic valve. When the self-controlling type outer irradiation photochemical reaction device is used, the sampling system inputs reaction liquid to the quartz reactor. The reaction system is controlled by the controlling system to start or stop. The quartz reactor is adequately mixed and reacted under the action of the magnetic stirring device and the light source. The self-controlling type outer irradiation photochemical reaction device has the advantages of being capable of regularly booting and shutdown, automatically adjusting power and intensity of light, automatically and quantificationally sampling, enabling the reaction liquid to adequately and evenly mix and react. The temperature is controllable and the reaction is stayed at an even temperature.

The invention relates to a universal polycarboxylic acid water reducing agent and a preparation method thereof. The universal polycarboxylic acid water reducing agent is of a liquid state and has the solid content of 40%. The universal polycarboxylic acid water reducing agent is the water reducing agent which is prepared from monomers such as allyl polyether, and maleic anhydride, (meth)acrylic acid or itaconic acid, methyl acrylate and sodium methallyl sulfonate through polymerization under the effects of a molecular weight chain initiator and a chain transfer agent and neutralization; and the water reducing agent contains carboxyl, sulfonic group and an allyl polyether side chain. The universal polycarboxylic acid water reducing agent disclosed by the invention is low in alkali content, high in water-reducing rate, labor-saving in concrete operation, simple in production process, easy in reaction condition control and free of environmental pollution; the cement mixture has high mobility and slump keeping property, and good peaceability; and the universal polycarboxylic acid water reducing agent disclosed by the invention can be used as an important component of high-performance concrete, and can be widely applied to stirred and cast-in-place concrete and ready-mixed concrete for various industrial and civil buildings.

The invention relates to universal polycarboxylic water reducer and preparation method thereof. The universal polycarboxylic water reducer is in liquid state, and the solid content of the universal polycarboxylic water reducer is 40%. The universal polycarboxylic water reducer containing carboxyl, sulfonyl and polyoxyethylene side chains is prepared by aggregation of modified polyoxyethylene ether or polyoxypropylene ether with (methyl) acrylic acid or itaconic acid, sodium methylallyl sulfonate and the like under the action of chain initiator and chain transfer agent. The universal polycarboxylic water reducer prepared by the method is low in alkali content and high in water reducing rate. When the universal polycarboxylic water reducer is added into concrete by the cementing material weight ratio of 0.25-10%, operation of the concrete is laborsaving, and cement mixture has high liquidity, falling protection capacity and workability. The universal polycarboxylic water reducer and the preparation method thereof are simple in process, easy to control and free of environment pollution. The polycarboxylic water reducer which is used as an important component of high-performance concrete is widely applicable to pre-mixed and cast-in-situ concrete for various industrial and civil buildings, and especially has excellent performance in high-strength concrete.

A method of continuously synthesizing hexanedioic acid through a microchannel reactor is disclosed and belongs to the technical field of organic synthesis processes. The method includes fully mixing hydrogen peroxide and a tungsten-containing catalyst, and pumping the mixture and cyclohexene which are two material streams into the microchannel reactor to continuously produce the hexanedioic acid, wherein a process of cyclohexene oxidation to prepare the hexanedioic acid is performed in two stages, namely a stage of oxidizing the cyclohexene into 1,2-cyclohexanediol and a stage of oxidizing the 1,2-cyclohexanediol into the hexanedioic acid. The method utilizes high mass transfer and heat transfer efficiencies of the microchannel reactor to effectively enhance the mass transfer speed between the two-phase materials, to stabilize the reaction temperature and to greatly improve experiment safety and operability. The reaction system is free of solvents, phase transfer catalysts and acid auxiliaries, thus reducing the production cost and facilitating separation and purification of the hexanedioic acid. The method allows efficient continuous production of the hexanedioic acid to be possible. The conversion ratio of the cyclohexene is 100%, and selectivity of the hexanedioic acid is 95.4%.

The invention relates to a method for preparing an ultra-low hydration-heat polycarboxylate-based water reducing agent. Methacrylic acid and Monomer methylacrylic acid polyethylene glycol single armor ether ester (MAAMPEA) water solution, initiator and modifier solution are simultaneously and slowly added into the solvent water drop by drop within 6 to 7 hours at the temperature of 80 DEG C to 90 DEG C, then the solvent water is subjected to thermal insulation for 4 to 5 hours at 90 DEG C to 95 DEG C and is naturally cooled down to the room temperature, and finally NaOH is used to adjust the pH value to 7 to 8, thereby obtaining the ultra-low hydration-heat polycarboxylate-based water reducing agent. The reaction conditions are easily controlled, no organic solvent is used during the polymerization process, and the process is simple with no industrial pollution. The concrete prepared by adopting the ultra-low hydration-heat polycarboxylate-based water reducing agent has the advantages as follows: when the mixing amount of the water reducing agent with the concentration being 25 wt percent is 1.0% of the concrete weight, the water reducing ratio can reach 30 percent, the 3d compressive strength of the concrete can be improved by more than 60 percent, the 28d compressive strength can be improved by more than 50 percent, and the 90d compressive strength can be improved by 30 percent.

The present invention provides a new method for preparing o-nitro anisole by using a micro-channel reactor, particularly application of a micro-channel reactor with an enhanced mass transfer unit structure to carry out a continuous flow o-nitro chloro benzene etherification reaction. According to the present invention, the mass transfer and the heat transfer can be completed dependent on the kinetic energy of the fluid without the mechanical stirring process under the reactor operation condition higher than the normal temperature, the space time reaction rate of the micro-channel reactor can be substantially improved, the temperature fluctuation and the concentration fluctuation during the reaction process can be avoided, the phenomena such as temperature runaway and overheating do not exist, and the reaction process is safe.

The invention discloses a preparation method of a DOPO vinylidene bridged derivative, a flame retardant and a flame-retardant polymer material. The method is characterized in that a DOPO compound reacts with cyclic carbonate in a reaction system containing the DOPO compound and cyclic carbonate to obtain the DOPO vinylidene bridged derivative. The method can be used for efficiently, simply and conveniently preparing the DOPO vinylidene bridged derivative with low energy consumption. The invention also provides the flame retardant containing the product prepared by the method and the flame-retardant polymer material containing the product prepared by the method.

The invention discloses a device for removing CO2 from flue gas in a power plant by using fly ash. The device comprises an activation reactor, a charging device, a fluidized bed, a cyclone separator and a waste material bin, wherein the output end of the activation reactor is connected with the charging device; the output end of the charging device is connected with the fluidized bed; the output end of the fluidized bed is connected with the cyclone separator; and the output end of the cyclone separator is connected with the waste material bin. The invention also discloses a method for removing the CO2 from the flue gas in the power plant by using the fly ash. The method comprises the following steps: conveying the fly ash into the activation reactor and carrying out activation treatment, then carrying out conveying into the charging device and carrying out charging treatment, then carrying out conveying into the fluidized bed so as to remove the CO2 in the flue gas, and finally carrying out conveying into the waste material bin. According to the invention, the device organically combines with a coal-fired power generating system; the flue gas and cold air in the coal-fired power plant can be utilized to provide a heat source and a cold source for the device; meanwhile, needed electric energy is provided for the device through a thermoelectric power generation technology; thus, an optimization scheme capable of reducing cost and energy consumption is realized.

The invention relates to the field of medical care, in particular to a preparing method for sodium alginate wound application with thrombin. The preparing method comprises the following steps that an ethanol aqueous solution of the thrombin is configured, then sodium alginate long beam fiber is put into a reaction tank of the thrombin ethanol aqueous solution for constant temperature soaking, sodium alginate short fiber is prepared through drying and cutting after soaking, the short fiber is curled, non-woven fabrics are prepared through non-woven processes such as opening and scutching, carding, lapping and needling and cut into application cores of needed sizes, the application cores, silicone hydrogel membranes with holes, a polyurethane film adhesive tape and an anti-adhesive layer are composited through an application machine, and finally, a finished product of the sodium alginate wound application with the thrombin can be prepared. According to the composite application prepared through the preparing method, activity of the thrombin can be maintained to the utmost extent, the excellent hemostatic and absorption performance is achieved, meanwhile, adhesion of the application and wound can be prevented, a moist healing environment is provided for the surface of the wound, and wound healing is prompted.

The invention especially relates to a stirring device for dissolved paste of chlorophyll and with a temperature controlling function, belonging to the field of stirring devices. The stirring device comprises a stirring tank, and a stirrer and an emulsification head arranged in the stirring tank, wherein the top of the stirring tank is provided with a powder feed inlet, a liquid feed inlet and a solid feed hopper; the sidewall of the stirring tank is provided with a plurality of flow-disturbing ribs and heating pipes; a cooling pipe is arranged in the stirring tank and connected with a coolingsystem; and the cooling system comprises a liquid coolant cooling unit, a liquid coolant case and a water pump. With such a manner, raw materials are fully stirred through arrangement of the stirrer and the emulsification head in the stirring tank; raw materials of different forms can be added via a powder suction pipe, the solid feed hopper and the liquid feed inlet; a feeding pump is used for sucking powder and liquid raw materials, so a production site is maintained clean; the heating pipes and the cooling pipe are arranged in the stirring tank to guarantee constant reaction temperatures; and the flow-disturbing ribs are arranged on the sidewall of the stirring tank to prevent dead stirring angles during stirring of a solution, so production efficiency and product quality are improved.

The invention discloses a method for continuously preparing 3, 5-dinitrobenzoic acid by using a micro-channel reactor, and belongs to the technical field of organic synthesis processes. According to the method, benzoic acid and concentrated nitric acid are used as raw materials, fuming sulfuric acid is used as a solvent, trifluorosulfonic acid ketone is used as a catalyst, and the preparation process of 3, 5-dinitrobenzoic acid is continuously completed in a micro-channel reactor system. After the raw materials are introduced into the micro-channel reactor through a metering pump, the 3, 5-dinitrobenzoic acid product is obtained through preheating, mixed reaction and separation, the method can strictly control the temperature and the retention time in the reaction process, accurately control the reaction temperature to prevent temperature runaway, and improve the safety of a reaction device; and due to the strong mass transfer effect of the micro-channel reactor, the mass transfer effect among the raw materials in the reaction system is enhanced, and the reaction efficiency and the yield of 3, 5-dinitrobenzoic acid are greatly improved.

The invention discloses a novel anti-coking VDF cracking furnace system which comprises a cracking furnace, a waste heat recoverer and a quench cooler, wherein the cracking furnace is internally provided with a spiral furnace tube and partition heating devices from top to bottom; the waste heat recoverer comprises a first shell-and-tube heat exchanger and a first horizontal tank body, a first jacket is arranged outside the first horizontal tank body, a discharge port of the cracking furnace is communicated with the first horizontal tank body, a discharge port of the first horizontal tank body is communicated with a tube pass feed port of the first shell-and-tube heat exchanger, a cold material is introduced into a shell pass of the first shell-and-tube heat exchanger, a shell pass discharge port of the first shell-and-tube heat exchanger is communicated with a feed port of the first jacket, and a discharge port of the first jacket is communicated with a feed port of the cracking furnace; and the waste heat recoverer is connected with a feed port of the quench cooler, and a discharge port of the quench cooler is connected to a product collection process. The cracking furnace system can reduce coking in the cracking furnace tube and the heat exchanger pipeline, prolongs the cleaning period of the cracking furnace tube and the heat exchanger, preheats cold materials through the waste heat recoverer, and reduces energy consumption.