67results about How to "Solve the problem of impurities" patented technology

The invention discloses a method for preparing o-phenylenediamine by catalytic hydrogenation of o-nitrophenylamine. The method is characterized in that: in the hydrogenation reaction of o-nitrophenylamine, alcohol is used as a solvent, nickel is used as a catalyst, reduction reaction is performed for 2 to 10 hours under the hydrogen pressure of 1.0 to 6 MPa at the temperature of between 40 and 80 DEG C, and the reaction product is rectified to form the while o-phenylenediamine. The method has the advantages that the alcohol is used as the solvent in the catalytic hydrogenation for producing o-phenylenediamine, the alcohol can be reclaimed and directly used for next reaction, and the waste residue produced by distillation can be used as an organic fuel, so that the problem that a large amount of waste water containing organic substances is produced in reduction of iron powder or sodium sulfide in the conventional process is solved; and thick acid and thick alkali used in the conventional process are avoided in the hydrogenation process, so that corrosion of equipment is greatly reduced, pollution is reduced, and almost zero pollution is realized. In addition, compared with the conventional iron powder or sodium sulfide reduction, the catalytic hydrogenation process has the advantages of low pollution, high yield, high quality, short production period and low energy consumption.

The invention discloses chemical compositions of ferrite ductile iron used at low temperature and a manufacturing method of the ferrite ductile iron, determines the range of the chemical compositions of the ferrite ductile iron used at low temperature being minus 40 DEG C and provides a quality standard for the production of qualified and stable ductile iron workpieces. The manufacturing method comprises the steps of adopting pure iron, a carburant and silicon iron as raw materials, synthesizing and melting the raw materials in an electric furnace, conducting spheroidization on the raw materials by utilizing a low-rare-earth spheroidizing agent, and producing the ferrite ductile iron by adopting a combined inoculation method. According to the method, the purity of molten iron is improved stably, and the difficulties of high phosphorus, sulphur, titanium, other imputies and interference elements contents in the molten iron, large fluctuation and instability are solved. According to the method, a novel technical scheme is provided for the production of ferrite ductile iron workpiece which contains small, circular and smooth ductile iron and does not contain cementite and iron phosphide eutectic basically, the ferrite ductile iron can meet the demands of high-performance ferrite ductile iron workpiece in electrical industry, high-speed rail industry and the like, the dependence on imported products can be broken; and the running safety of nuclear power and the high-speed rail can be improved substantially.

The invention discloses a low-voltage electrical appliance cabinet having a circular heat-dissipation function. The low-voltage electrical appliance cabinet comprises an electrical appliance cabinet body, wherein the electrical appliance cabinet body is hinged with a cabinet door by means of hinges, a substrate is horizontally arranged inside the electrical appliance cabinet body, the bottom partinside the electrical appliance cabinet body is provided with a water cooler by means of screws, a circulation pump is arranged on the top part of the water cooler, a cooling pipe is arranged on the circulation pump, the cooling pipe extends upwards after passing through the substrate, the cooling pipe is fixed on the inner wall of the electrical appliance cabinet body by means of hoop members, and the water cooler is fixed connected with the cooling pipe by means of a return pipe. According to the low-voltage electrical appliance cabinet, a radiating plate absorbs heat rapidly, the high-temperature heat of the radiating plate is taken away by using circulating cold water when the cooling pipe flows through the radiating plate, the absorption efficiency is high, the temperature reducing speed is fast, the internal heat of the electrical appliance cabinet is released to the outside by means of a draught fan, the problem of introduction of impurities in the air is solved since the air flows outwards, a flow guiding top is of an arch-shaped structure, the flow guiding effect is good, and backward flow of rainwater is prevented.

The present invention belongs to the field of gas processing, and provides a method for removing acid gas by adopting methanol as an absorbent. According to the present invention, the method is mainly characterized in that a pre-washing tower is designed in front of an absorption tower, and pre-washing is performed on raw material gas with a barren solution obtained from the original low temperature methanol washing device and with a temperature of about 30-40 DEG C, such that the raw material gas is dewatered and completely dried, and ammonia naphthalene, benzene and other components carried in the raw material gas are removed; the liquid on the bottom portion of the pre-washing tower enters a methanol water separation tower; and the gas on the top of the pre-washing tower enters a process gas cooler and then enters the absorption tower. With the method of the present invention, the problem of the impurity and the moisture carried by carried raw material gas before entering the absorption tower is solved, wherein the raw material gas is pre-washed, such that the raw material gas is dewatered and dried, and the impurity such as ammonia, naphthalene, benzene and the like are removed so as to make the subsequent treatment system stable.

The invention discloses an extraction washing method for low-chlorine-ion high-purity cobaltous sulfate. The extraction washing method comprises the following steps that firstly, cobalt containing rawmaterials are subjected to leaching and P204 extraction and impurity removal through a conventional method, raffinate is obtained, an organic extraction agent and sulfonated kerosene are mixed, and counter-current extraction is conducted through an extraction box; secondly, a loaded organic phase enters an extraction washing section for counter-current washing, hydrochloric acid is used for washing a small number of nickel, magnesium and calcium impurities in the organic phase, and the obtained washed loaded organic phase is subjected to washing and chlorine ion removal; and thirdly, second-section washing is conducted, the washed loaded organic phase in the second step enters second-section washing and is subjected to counter-current chlorine ion washing, sulfuric acid is added for washing, the PH value is controlled, and the obtained washed loaded organic phase is subjected to reverse extraction through sulfuric acid. The problem that cobaltous sulfate products are high in impurityor chlorine ion content is solved, the purity of the cobaltous sulfate products is improved, the quality of raw materials of the battery positive electrode material precursor is guaranteed, the two-section washing manner is adopted, the chlorine ion washing effect is achieved, magnesium calcium sulfate sediments cannot be formed, so that extraction tank blockage is avoided

The invention discloses a grain-drying dust collector. The grain-drying dust collector comprises a grain inlet, a drying part, a dust collection part, a transmission part and a grain outlet, wherein the grain inlet is connected with a drying channel, the barrel body at the periphery of the drying channel is made of an iron sheet material, the drying channel is connected with a drying machine by a hot air pipe, and the drying channel, the hot air pipe and the drying machine form the drying part of the grain-drying dust collector. The grain-drying dust collector is high in drying speed, only requires ten more seconds generally, has the characteristic of instantaneously drying, and can effectively solve the problems that grain products are moist and contain impurities.

The invention provides a solar panel preparing method, which comprises the steps of: a, preparing a-Si:H film on the surface of a silicon chip after texturing; b, treating the silicon chip containing the a-Si:H film on the surface obtained in the step a at 800 to 900 DEG C for 60 to 120 min; and c, carrying out corrosion treatment on the surface of the silicon chip treated through high temperature. The solar panel preparing method has the advantages that a layer of a-Si:H film is deposited on the back surface of the silicon chip after the texturing, the problems of many impurities and micro defects in the silicon chip can be perfectly solved, the electrochemical performance such as the service life, the photoelectric conversion efficiency and the like of solar panels is improved, in addition, good back side and body passivation effects can be realized, the current and voltage (I-V) character of solar batteries is improved, and simultaneously, the process is simple and is easy to implement.

The invention discloses a method for preparing a sofosbuvir intermediate by using a microfluid reaction device. The method comprises the following steps: pumping phenyl dichlorophosphate and pentafluorophenol into a first micro-channel reactor, carrying out a first-step acylation reaction, pumping the product obtained in the first step and L-alanine isopropyl hydrochloride into a second micro-channel reactor, carrying out a second-step substitution reaction to prepare a racemic sofosbuvir intermediate mixture, enabling the product to directly enter a micro-flow extraction device, and finally re-crystallizing to obtain a single-configuration target compound. Compared with the method in the prior art, the method disclosed by the invention has the advantages that the integration of efficientreaction and separation can be realized, the operation is simple, the problems caused by intermittent operation of extraction after product collecting are avoided, the reaction steps are few, the yield of the final product is high, the energy consumption is low, and the continuous large-scale production operation can be realized.

A FINFET manufacturing method, comprising: a. providing a semiconductor substrate, and forming a first fin on the substrate; b. covering the first fin with a mask layer; c. forming a punch-through barrier layer in the semiconductor substrate; d. etching the punch-through barrier layer and a part of the semiconductor substrate in sequence by taking the first fin and the mask layer as masks, expanding the first fin into a second fin, and removing the masks; and e. forming a trench isolation structure on the semiconductor substrate, forming a source-drain region on the second fin, and forming a gate laminate and an interlayer dielectric layer on the semiconductor substrate and the second fin. A punch-through barrier layer is formed by means of lateral scattering, and at the same time, an isolation layer is formed after the punch-through barrier layer is formed using a substrate material as a carrier of scattering impurities, thereby effectively solving the problems of impurities and damage introduced during lateral scattering, and greatly improving the performance of a device.

The invention discloses an N-type MWT solar cell and a preparation method thereof, and relates to the technical field of solar cells. The N-type MWT solar cell comprises an N-type silicon substrate, wherein the N-type silicon substrate is provided with through holes; a P-type emitter junction region is arranged on the front surface of the N-type silicon substrate; metal contact electrodes are guided to the back surface of the N-type silicon substrate through the through holes; a non-back field N-type silicon substrate region is arranged on the periphery of each through hole on the back surface of the N-type silicon substrate; the surface of a phosphorus back field and the surfaces of the non-back field N-type silicon substrate regions are basically on the same plane; an antireflection film layer is arranged on the front surface of the N-type silicon substrate, the surfaces of the non-back field N-type silicon substrate regions, the surface of the phosphorus back field and the inner walls of the through holes; and the ends, on the back surface of the N-type silicon substrate, of the metal contact electrodes and the surface of the antireflection film layer are in contact. By the preparation method of the solar cell, damages and impurities due to the fact that the MWT solar cell is prepared by a laser ablation process are omitted; the photoelectric conversion efficiency of the solar cell is improved; the preparation technology of the method is simple; and cost control is facilitated.

The invention relates to the welding technology, particularly to an infrared preheating friction welding process. The infrared preheating friction welding process comprises the steps of, firstly, obtaining at least two workpieces to be welded; secondly heating the welding position, namely, the contact end surface of at least one workpiece to be welded through a heating plate serving as a heating source; thirdly, welding the two workpieces to be welded through a friction welding process. An infrared preheating friction welding tool comprises a frame which is provided with a friction welding device, and the heating plate which is used for heating the contact end surfaces of the workpieces to be welded, wherein the heating plate is provided with heating wires according to the contour of the contact end surfaces of the workpieces to be welded and is movably connected with the frame. The heating wires can heat the workpieces to be welded, so that heat generated by the heating wires can be organically combined with heat generated due to friction, and the contact end surfaces of the workpieces to be welded rapidly reach or approach a molten state, and further the problems existing in a welding mode which only relies on the heat generated due to friction, including impurities, cool slag, flashes, low welding speed and poor forming effects, can be solved.

The invention discloses a purification method of enzalutamide. According to the method, a coarse enzalutamide product is added to a recrystallization vessel and dissolved through an alcohol or amide organic solvent; a hydrocarbon solvent is dropwise added while agitating, wherein the dropwise adding speed is controlled and a crystal precipitate of materials in the system can be gradually separated out, and after the dropwise adding is done, the solid can be separated out; the solid can be filtered to obtain the fine enzalutamide product. By virtue of the method, the problems such as instantaneous caking and impurities occurring in recrystallization of enzalutamide can be solved; the method is suitable for industrial production; the enzalutamide product obtained by recrystallization has the purity more than 99.5%, and the recrystallization yield is more than 75%; an enzalutamide preparation is processed according to the requirements of standard on raw medicines in Chinese Pharmacopoeia, so that a patient can use safely.

The invention discloses a moisture-proof power distribution box convenient for heat dissipation, the power distribution box comprises a semi-closed box body made of metal, the semi-closed box body is used for supporting a circuit, a condensing device driven by a motor is arranged on the edge of the box body, the moisture-proof and heat-dissipation effects are achieved, the condensing device is connected with the side edge of the box body through an air inlet and an air outlet, the motor drives a propeller to rotate, gas in the box body is pumped out of the box body from the air outlet, the gas is brought to a condensation pipe through an air outlet pipe, the condensation pipe cools the air, water vapor in the air is liquefied and left in the condensation pipe, and then the water vapor is discharged through a water outlet, a storage battery for supplying power to the motor is installed in the box body, and a strain gauge 1 and a strain gauge 2 are further installed in the box body to change the temperature and the humidity in the box body respectively, so that a circuit is switched on, and the motor is started. The power distribution box has moisture-proof and heat-dissipation effects.

Disclosed is a novel rubber compound processing technology. After an upper associated machine controls an internal mixer to mix rubber materials, carbon black and compounding ingredients, unloading is carried out, and rubber materials are unloaded to a cooling open mixing machine through a buffer hopper. After being subjected to rubber overturning cooling through the clamping function of a rubber overturning belt of the open mixing machine, the rubber materials are discharged and distributed to a mixing open mixing machine through a conveying belt conveyer to be subjected to rubber overturning and pouring. After supplementary mixing, the rubber materials are discharged. An automatic rubber sheet bundling device is installed at the back of an outlet rubber belt conveyer of the mixing open mixing machine, and rubber sheets are automatically bundled, then are conveyed to a belt type rubber bundle weighing device through a belt conveyer, then are conveyed to a tablet compressing machine to be subjected to tablet compressing, enter a low-temperature rubber filter to be subjected to rubber filtering and purification, and enter a rubber cooling device in a tablet form to be subjected to cooling and rubber collection. If the rubber sheets are not filtered, the rubber sheets can directly enter the rubber cooling device by selectively omitting the rubber filter, and the rubber cooling process is started. The novel rubber compound processing technology has the advantages of being efficient, saving energy, achieving automation of a single thread, and improving the performance and yield of the rubber materials and rubber components in the later procedures.

The invention discloses a method for purifying an AgCd alloy from AgCd waste and recycling the AgCd alloy. The method comprises the steps that equal-area foam ceramic sheets are placed at the bottom of a smelting furnace, then the AgCd waste is placed, and high-temperature smelting treatment is conducted; after refining is completed, the foam ceramic sheets floating on the surface of a melt are taken out, and the high-purity AgCd alloy is obtained; and the AgCd alloy serves as a raw material to prepare an AgCdO material. An electric contact material fed by adopting the high-purity AgCd alloy is high in raw material purity and low in impurity, and thus has good physical and chemical property and excellent machining property. By adopting the method, AgCd leftover materials generated in the production process of the AgCd electric contact material are recovered and reutilized, AgCd alloy elements in the waste are effectively recovered, material transferring is quick, and economic benefitsare remarkable.

The invention belongs to the technical field of filter filtration, and particularly relates to a filter outer net and a preparation method thereof. The filter outer net comprises a fixed plate, a filter ring and a diversion joint; the filter ring is arranged between the fixed plate and the diversion joint; the inner arc surface of the filter ring is connected with an adjusting ring in a vertical sliding manner; filtering holes, which are uniformly distributed, are formed in the surface of the filter ring; adjusting holes, which are uniformly distributed, are formed in the surface of the adjusting ring, and the adjusting holes are matched with the filtering holes. The automatic adjustment of the filter value of the filter is effectively realized, the requirements of different fluids and different fluid states on various filter values can be met, and when the filter is used for a long time and the filter holes are blocked, the sizes of the filter holes can be automatically adjusted according to the pressure difference change, so that the problem of insufficient downstream fluids is solved.

The invention relates to the field of refinement methods of compounds, and particularly relates to a refinement technique of fluorometholone. The refinement method is characterized by comprising the following particular technical steps of (1), dissolving 100g of fluorometholone crude product in 400mL to 500mL of one or several of amide organic solvents, agitating and heating an obtained first mixture to 80 to 90 DEG C, and maintaining the temperature for 0.5h; (2), slowly adding 1L to 2L of alcohol solvent, maintaining a temperature in an interval of 60 to 75 DEG C in an entire addition process, after the addition is completed, maintaining temperature for 0.5h, then decreasing the temperature to 0 to 5 DEG C, maintaining the second mixture at 0 to 5 DEG C to crystallize the second mixture for 12h; (3), filtering and drying an obtained third mixture to obtain 25g to 33g of similarly white crystal fluorometholone refined product. The mass concentration of the fluorometholone crude product in the step (1) is 97 to 98 percent. By using the refinement method, the impurity problem in the refinement of the fluorometholone is solved; not only is a related substance of the fluorometholone enabled to completely meet requirements in the British Pharmacopoeia BP2008 and the United States Pharmacopoeia USP36, that is, the purity is more than 99 percent, and a single impurity is less than 0.5 percent, but also a known single impurity can be guaranteed to be less than 0.15 percent, the total impurity can be guaranteed to be less than 0.1 percent; the great improvement is achieved compared with the requirements in the Pharmacopoeias.

The invention discloses a preparation method for an antimony sulfide film. Raw materials for preparing the antimony sulfide film are stibnite which is simply screened. According to the preparation method, melting point differences of antimony sulfide in the stibnite from other impurities are used, tubular annealing furnace coating and annealing one-step treatment is used in cooperation, and the film which can be on a par with a film made of a raw material being high-purity antimony sulfide (with the purity higher than or equal to 99.999%) is prepared. In the process of preparing the antimony sulfide film, the preparation method can avoid the environmental pollution problem generated in the process of preparing the high-purity antimony sulfide raw material, can solve the problems of impurities and insufficient sulfur in the process of preparing the antimony sulfide film through the stibnite, is simple and efficient in technological process, greatly reduces the preparation cost, is stable, reliable, wide in application range and suitable for most substrates requiring coating with antimony sulfide, and is an energy-saving, high-efficiency, green and environment-friendly method.

The invention relates to the field of building processing, and in particular, relates to multi-stage mixing and filtering impurity removal equipment for a structural adhesive for building processing, wherein the equipment comprises a box body, a material control mechanism used for controlling the feeding amount, a filtering mechanism used for filtering impurities in the structural adhesive, a vibration mechanism used for driving the filtering mechanism to vibrate to enable the structural adhesive subjected to impurity removal to fall off, a heat conduction assembly used for heating and softening the structural adhesive in the filtering mechanism, a first-stage mixing mechanism used for preliminarily mixing and stirring the structural adhesive, a second-stage mixing mechanism used for further mixing and stirring the structural adhesive, and a storage mechanism used for storing the processed structural adhesive; and the storage mechanism is arranged at the bottom end of the inner side of the box body, and the storage mechanism is also located below the secondary mixing mechanism. According to the multi-stage mixing and filtering impurity removal equipment, the problems that impurities exist in traditional building structural adhesives and the quality is unqualified due to incomplete mixing of the traditional building structural adhesives are solved, the quality of the building structural adhesives is improved, and the strength of the building structural adhesives is enhanced.