16results about How to "Avoid violent reactions" patented technology

The invention belongs to the technical field of functional sugar, and particularly relates to resistant dextrin with high dietary fiber content and a preparation method thereof. The preparation method comprises the following steps: mixing pea starch milk and liquefying enzyme, and liquefying to obtain liquefied liquid; the DE value of the liquefied liquid is 8-11%; carrying out molecular rearrangement reaction on the liquefied liquid under an acidic condition to obtain resistant dextrin; the mass content of dietary fibers in the resistant dextrin is greater than or equal to 93%. The pea starch is used as the raw material, the dextrin crude product feed liquid (liquefied liquid) with the appropriate DE value is easily obtained after liquefaction, the DE value of the liquefied liquid is controlled to be 8-11%, and the prepared resistant dextrin is high in dietary fiber content and good in digestion resistance.

The invention discloses a method for synthesizing a tonalid intermediate HMT, and belongs to the technical field of organic synthesis. According to the method, a specific liquid catalyst and an organic solvent are selected to prepare a catalyst phase, raw materials required for synthesis of tonalid are mixed according to a reasonable ratio to form a raw material phase, then the two phases are introduced into a microchannel reactor for a catalytic reaction, and after the reaction is completed, a target product is obtained through post-treatment steps such as quenching, water washing and rectification. Aiming at the defects that a solid catalyst in the prior art is difficult to realize homogeneous reaction and the reaction process is violent and difficult to control, by optimizing catalyst type selection and reaction process design, a reaction system has good homogeneous property, the reaction process is milder and is easy to accurately regulate and control, the stability and reliability of product preparation are effectively improved, and the method is suitable for industrial production. The method is suitable for industrial large-scale production.

The invention relates to the technical field of organic synthesis, and particularly discloses a pentylnonanal synthesis method based on n-heptanal condensation, which comprises the following steps: S1, early-stage preparation: raw material preparation, catalyst selection, reaction equipment preparation and safety preparation; s2, reaction operation: inert gas protection, raw material addition, reaction condition control, stirring and monitoring; s3, product separation and purification: reaction completion, product separation, purification treatment and quality detection; s4, performing subsequent treatment; by introducing nitrogen into the reaction kettle, oxygen in a reaction system is eliminated, an oxygen-free environment in the reaction process is maintained, the gas inlet pipe and the exhaust pipe are arranged on the surface of the reaction kettle, and corresponding control equipment is arranged, so that gas in and out in the reaction process are more automatic and accurate, the complexity and the error rate of manual operation are reduced, and the production efficiency is improved. And the possible danger of flammable and explosive substances in the n-heptanal condensation reaction due to the existence of oxygen is avoided.

The invention provides anti-oxidation coated SmFeN powder as well as a coating method and application thereof. The coating method comprises the steps of material taking, material adding, ball milling, material discharging and drying which are carried out in sequence, materials related to the material taking comprise SmFeN powder prepared by a reduction diffusion method, butylated hydroxytoluene and a zirconium coupling agent, and the SmFeN powder is prepared by the reduction diffusion method; the step of feeding comprises the step of adding SmFeN powder into a ball mill; the ball milling comprises the step of adding butylated hydroxytoluene and a zirconium coupling agent into a ball mill in batches, and the concentration of the butylated hydroxytoluene in the ball-milled material in each batch is less than or equal to 0.02 wt%. The coating method provided by the invention can be used for coating fine SmFeN powder, and on the premise of ensuring the performance of SmFeN, dangers in the production process are avoided, the preparation process is simplified, the production cost is reduced, and large-scale popularization and application are facilitated.

The present invention discloses an automated metal heat treatment equipment and method thereof, which relate to the technical field of metal treatment, and include a bed frame, a base is fixedly installed at the bottom of the bed frame, a slide rail is slidably installed at the bottom of the bed frame, a hydraulic rod is fixedly installed at the bottom of the slide rail, a hook is arranged at the output end of the hydraulic rod, a sensor is arranged on the surface of the bed frame, a sensing module and a control module are arranged inside the sensor, a buffer device is arranged at the bottom of the slide rail, the outer shell is fixedly installed at the bottom of the slide rail, the output end of the hydraulic rod is slidably installed and passes through the bottom of the outer shell, the spring piece is fixedly installed on the circumferential surface of the output end of the hydraulic rod, and the movement of the output end of the hydraulic rod will drive the spring piece to move, so as to prevent the rapid contact between metal and water from causing a temperature gradient on the surface and inside of the metal workpiece, thereby generating residual stress, inducing cracks and deformation, and causing damage.

The invention discloses a preparation method of micron dendritic copper powder. The method comprises the following steps: 1, adding a reducing agent and polyvinylpyrrolidone into deionized water, and uniformly stirring to obtain a clear solution; 2, adding copper acetate or a copper acetate solution into the clear solution, and uniformly stirring to obtain a mixed solution; 3, performing hydrothermal reaction on the mixed solution to obtain a reaction product; and 4, settling and washing the reaction product, and performing vacuum drying to obtain the micron dendritic copper powder. The micron dendritic copper powder is prepared by taking copper acetate as a raw material, using a green reducing agent and adopting a hydrothermal reaction, so that the problem that agglomeration is easy to occur when the dendritic copper powder is prepared by an electrolytic method is avoided, the technical limitation that acute reducing agents such as red phosphorus need to be used at present is effectively solved, and the method has the advantages of simplicity in operation, low cost, greenness, environmental friendliness and the like; the copper powder is suitable for the fields of antibiosis, printed circuit boards, conductive fillers, radio frequency electronic tags, catalysis, wave absorption, electromagnetic shielding and the like.

A storage and transportation device for phenyl lithium comprises a device body, and a vacuum air pump is arranged in the middle of the top of the device body; a phenyl lithium extraction assembly is mounted on the left side of the top of the device main body and comprises an extraction pipeline and a first pump body; an inert liquid sealing assembly is mounted on the right side of the top of the device main body and comprises a sealing pipeline and a second pump body; the outer side wall of the device body is further wrapped with a fireproof and anti-collision protection layer. By arranging the vacuum air pump, the interior of the device main body is firstly vacuumized to form a vacuum environment, and phenyl lithium is prevented from reacting with air factors in the device main body; by arranging the phenyl lithium extraction assembly and the inert liquid sealing assembly, phenyl lithium is extracted into the device main body in a vacuum environment, and then the phenyl lithium is sealed by using inert liquid, so that the phenyl lithium is prevented from generating violent reaction with external factors; and by arranging a fireproof layer and an anti-collision layer, phenyl lithium in the device main body is prevented from being influenced by an external fire source.

This invention relates to the field of N-(2,4-dinitrophenyl)-4-nitrobenzamide preparation technology, specifically to a green method for preparing nitramide compounds. The method involves adding a catalyst and dispersant to a reactor and mixing them uniformly. Then, a first and a second stream of materials are simultaneously added dropwise to the reactor for reaction. The temperature within the system is controlled during the dropwise addition. After the dropwise addition is complete, the temperature is increased to continue the reaction. After the reaction is completed, N-(2,4-dinitrophenyl)-4-nitrobenzamide is obtained through post-treatment. The first stream is a dispersion containing 4-nitro-N-phenylbenzamide, and the second stream is a nitrating agent consisting of a uniform mixture of N₂O₅ and nitric acid. This preparation method features high product conversion rate, a mild reaction process, safe and controllable production process, effectively reduces the amount of residual intermediates, and minimizes pollution.

The invention discloses mechanical sealing equipment for sulfonyl isocyanate, and relates to the technical field of sealing equipment.The mechanical sealing equipment comprises a bottom machine body and an upper machine body, and a mounting cavity located in the bottom machine body and the upper machine body is formed between the bottom machine body and the upper machine body; the isolation cavity is filled with inert gas, and the outer side is isolated by the inert gas, so that sulfonyl isocyanate is protected from interference of other substances in the air, the reaction is ensured to be carried out in a stable environment, when the sulfonyl isocyanate leaks, the concentration of the sulfonyl isocyanate can be reduced, and the reaction time is shortened. The fierce reaction between sulfonyl isocyanate and the external environment is avoided, and the protection effect is improved; and when the sulfonyl isocyanate leaks, the inert gas and the gas containing the sulfonyl isocyanate can be driven by the driving pump to be filled into the inert gas bag, so that the leaked gas containing the sulfonyl isocyanate is stored, the reaction caused by the leakage of the sulfonyl isocyanate is avoided, and the reaction time is prolonged.

The utility model relates to a synthetic reaction device suitable for carbamazepine bromide. The synthetic reaction device comprises a reaction kettle, a solid feeder, a condenser, a solvent receiving tank, a buffer tank and a pipeline system, the reaction kettle, the solid feeder, the solvent receiving tank and the buffer tank are provided with discharging pipes and control valves, the pipeline system is properly provided with a control valve, two working modes of backflow gas absorption and evaporation solvent gas absorption are switched through a valve switch, and the solid feeder can slowly add solids into a reaction system. According to the utility model, the feeding speed of solid materials can be controlled, and two working modes of reflux gas absorption and evaporation solvent gas absorption can be quickly and conveniently switched.

The invention discloses a multi-stage neutralization device for laterite-nickel mining and a circulating leaching neutralization system.The multi-stage neutralization device for laterite-nickel mining comprises a plurality of neutralization tanks, a plurality of first stirring devices, an ore pulp pipeline, a limestone slurry pipeline and an automatic regulation and control device, and the multiple neutralization tanks are arranged at intervals in the first direction; the plurality of neutralizing tanks are provided with a first side and a second side which are oppositely arranged along a second direction, and the ore pulp pipeline is arranged on the first side and can be sequentially connected in series with any part or all of the plurality of neutralizing tanks; the limestone slurry pipeline is arranged on the second side, the limestone slurry pipeline is respectively connected with the plurality of neutralizing tanks, and the automatic regulation and control device can regulate and control the adding flow of the limestone slurry in the neutralizing tanks according to the liquid levels in the neutralizing tanks. And the addition amount of the limestone slurry is controlled by matching with the automatic regulation and control device, so that the optimal reaction rate in the neutralizing tank is ensured while severe reaction is avoided.

The invention belongs to the technical field of microchannels, and particularly relates to a method for reducing the acid value and peroxide value of grease based on a microchannel reactor, which comprises the following steps: S1, preparing a sodium hydroxide solution and grease, and controlling the temperature range to be 40-65 DEG C; s2, the sodium hydroxide solution and grease are conveyed into a micro-mixer to be subjected to a mixed reaction and flow into a first micro-channel to continue the reaction, the micro-mixer is placed in a water bath environment at the temperature of 40-70 DEG C, the first micro-channel comprises a front section placed in the water bath environment at the temperature of 40-75 DEG C and a rear section placed in the water bath environment at the temperature of 60-80 DEG C, and a mixed solution is obtained; s3, collecting a mixed solution at an outlet of the first micro-channel, and centrifuging to remove saponified substances and water to obtain deacidified grease; s4, the deacidified grease is conveyed into a second micro-channel, the second micro-channel comprises a front section placed in an oil bath environment of 150-250 DEG C and a rear section placed in a water bath environment of 60 DEG C or below, and refined grease is obtained.

The utility model discloses a reaction cooling system for preparing 2-(diphenylphosphino) methyl benzoate, which comprises a reaction module, a condensation module and a cryogenic TCU module, a steam outlet of the reaction module is communicated with a reflux inlet through the condensation module to form circulating cooling matching, and a cooling medium of the condensation module is heat conduction oil. A heat conduction oil outlet of the condensation module is communicated with a heat conduction oil inlet through the cryogenic TCU module to form circulating secondary cooling cooperation, and the cryogenic TCU module and heat conduction oil at the heat conduction oil inlet form temperature control cooperation, so that safety accidents caused by violent reaction generated by contact between leaked cooling water in the condensation module and reactants are avoided. Meanwhile, a TCU temperature control system is introduced to provide constant-temperature cooling, blockage is prevented, and the recovery rate of the solvent is increased.

A method for extending the service life of a hot metal ladle, the method comprising the steps of: emptying the remaining slag iron in the hot metal ladle; taking the hot metal ladle offline; cleaning the residual slag iron on the wall surface of the hot metal ladle; baking the hot metal ladle; adding a deoxidizer to the hot metal ladle; and putting the hot metal ladle online. The present application provides a method for extending the service life of a hot metal ladle, wherein a deoxidizer is added to the hot metal ladle, and the added deoxidizer reacts with oxides such as FeO in the high-temperature slag iron molten in the hot metal ladle, and forms a carbon excess state, so as to prevent the oxides in the slag iron from reacting with the carbon in the hot metal and the carbon element in the refractory material, completely solving the violent reaction in the hot metal ladle connection process and the iron leakage accident of the hot metal ladle, and extending the service life of the hot metal ladle.

The invention discloses a step-by-step chlorination process capable of reducing chlorination impurities, and relates to the technical field of chlorination processes, and the chlorination process comprises the following steps: step 1, sequentially putting raw materials into a crushing and grinding device and a mixing device, and carrying out pretreatment in a fine grinding and mixing form on the raw materials; 2, primary chlorination: introducing a small amount of chlorine into a reaction device at 70-95 DEG C, carrying out a primary reaction on the chlorine and the raw materials to generate an intermediate product, strictly controlling the chlorine flow and the reaction temperature in the step, and avoiding a violent reaction or generation of byproducts; and step 3, intermediate treatment: putting the preliminary chlorination product into a filtering device, and physically separating and purifying the preliminary chlorination product by using a physical method so as to remove impurities or adjust the form of the product. And therefore, the yield and the product quality are influenced due to the fact that the amount of generated chloride is relatively high.

This application relates to the field of heat treatment technology for metallic materials, and more particularly to a surface treatment liquid and a heat treatment method for zinc-based coated hot-formed steel. The surface treatment liquid is used in the surface treatment of zinc-based coated hot-formed steel. By mass fraction, the components of the surface treatment liquid include: phosphate: 0.5% to 1.0%, molybdate: 0.5% to 1.0%, organic surfactant: 0.01% to 0.1%, alcohol additive: 2% to 5%, and solvent: 92.9% to 96.99%. This surface treatment liquid can pre-construct a specially designed high-temperature stable composite protective film on the zinc-based coating, significantly improving the stability of the entire zinc-based coated hot-formed steel during the heat treatment process, ultimately obtaining heat-treated components with superior performance and better surface quality; and zinc combustion is difficult to occur during the overall heat treatment process.