41results about How to "Avoid compromising purity" patented technology

The invention discloses a preparation method for high-purity gallium oxide. The method includes the following steps: mixing metal gallium and water for a reaction to generate a mixture; filtering themixture, and performing drying; and performing calcination on the mixture to generate the gallium oxide. According to method, gallium oxide hydroxide and gallium oxide are prepared through ahigh-temperature hydrothermal reaction, drying is performed and calcination is performed to make the gallium oxide hydroxide decomposed into gallium oxide and water, and after the water is evaporated and escaped, the high-purity gallium oxide is obtained. The present application also provides a preparation device for preparing the high-purity gallium oxide.

The invention discloses a preparation method of a pure-phase Li2Si2O5 rodlike crystal. After LiOH.H2O is dissolved in distilled water, tetraethyl orthosilicate is dropwise added, the mixture is uniformly mixed, a mixed solution is obtained, the mixed solution is placed in a hydrothermal reaction liner to react to obtain a white precipitate, the white precipitate is subjected to suction filtration,a filter cake is obtained, the filter cake is dried again, white powder is obtained and ground, and the pure-phase Li2Si2O5 rodlike crystal is obtained after heat treatment. The method is simple to operate, low in equipment requirement, wider in parameter range, easy to control and high in yield, the price of raw materials is low, the size of the obtained rodlike crystal is adjustable, the structural strength is high, and the method is suitable for mass commercial promotion.

The invention discloses a method for recovering a composite extracting agent in the extraction and separation process of coal tar waste residues. The method includes the steps that a mixed solution which includes the composite extracting agent and coal tar and is obtained after the coal tar waste residues are extracted and separated is fed into a distillation retort, and then water is added and heated to be boiled; the azeotrope formed by the composite extracting agent and the water is volatilized out from the mixed solution; distillate is recycled in a condensation mode so that an oil-water mixture can be obtained; the composite extracting agent and the water are obtained by standing and layering and then are returned to the system to be recycled. The method has the characteristics that the recovered temperature of a furfural and ester composite extracting agent is low, operation is safe and reliable, the handling capacity is large, solvent loss is small, and the water content of tar is lower than 3%.

The invention discloses an automatic voiceprint modeling warehousing method, device and equipment. The concept of the invention lies in that a set of data cutting thought for massive corpora is provided for the demand of speaker voiceprint modeling, so that thematic and hierarchical properties of the massive corpora are realized, and the task of voiceprint modeling and storage by using the massivecorpora is completed. The method specifically comprises the steps of performing initial filtering and distinguishing on mass data based on multi-dimensional information by utilizing a reduction thought, then performing staged progressive classification and purification operation on simplified corpus data by adopting a multi-stage superimposed consensus clustering thought, and finally obtaining corpora capable of being used for voiceprint modeling. According to the invention, a large amount of labor cost does not need to be invested for labeling, and the problem that voiceprint modeling storage cannot be achieved finally due to the fact that the error rate is possibly downloaded step by step due to direct indiscriminate voiceprint collision clustering on mass data, and the purity of modeling corpora is affected is avoided.

The invention discloses a quartz sand pickling method and device. According to the technical scheme of the quartz sand pickling method and device, the quartz sand pickling device comprises a picklingbed with a cavity used for containing quartz sand, and a sealing cover capable of sealing the cavity is detachably connected to the upper end of the pickling bed; a pickling unit for conveying acid liquor to the bottom of the quartz sand from the lower part of the cavity and an air supply device for conveying compressed air into the cavity are arranged on one side of the pickling bed; the air supply device is used for supplying air into the cavity from the upper end or the lower end of the pickling bed; and the quartz sand pickling device also includes a water supply device used for conveyingpure water to the bottom of the quartz sand. The invention has the beneficial effects that acid liquor and quartz sand are fully mixed, the pickling effect is good, less cleaning water is used, the cleaning time is short, and the cost is reduced.

The invention discloses an efficient oil removal settling tank for oilfield produced water treatment. The efficient oil removal settling tank comprises a tank body, wherein an oil-water separation cavity and a settling cavity are respectively formed in the top and the bottom of the tank body, a hot air inlet is formed in the top in the tank body, a hot air exhaust pipe is installed at the bottom of the hot air inlet, a filter plate is installed at the bottom of the oil-water separation cavity, a center rod is installed in the middle of the upper surface of the filter plate, the top of the center rod is sleeved with a sliding block, and a rigid oil collecting pipe is installed on the front side of the sliding block. According to the invention, by arranging the hot air outlet pipe at the bottom of the hot air inlet and arranging the oil collecting disc at the top of the rigid oil collecting pipe, hot air conducts heat preservation and heating on emulsified oil, crude oil, dispersed oil and other oil layers floating on the top in the tank body through the hot air exhaust pipe of the hot air inlet, so that the phenomena that the temperature of the oil layers is too low, the paraffin components in the oil layers are prone to coagulation, the oil collecting disc is blocked, and normal oil-water separation work is affected are avoided, and the efficient oil removal settling tank is practical and suitable for wide application and popularization.

The invention belongs to the technical field of microorganisms and sewage treatment, and particularly relates to a microbial agent for treating high-salt industrial wastewater. The microbial agent is prepared from the following raw materials in parts by weight: 20 to 28 parts of activated sludge, 11 to 13 parts of quaternary ammonium salt lignin flocculate, 16 to 20 parts of small-particle activated carbon, 35 to 45 parts of microbial liquid and 5 to 10 parts of antioxidation buffer agent. Microbial florae are enabled to have an adherent carrier, the added quaternary ammonium salt lignin flocculant enables the microbial florae, activated sludge and small-particle activated carbon to be combined, so that the microbial agent does not need to be stored in a low-temperature environment. The preparation method of the microbial agent for treating the high-salt industrial wastewater comprises the following steps: firstly, the antioxidation buffering agent enters a mixed material through a feeding pipeline, a feeding hole in a mixing device, a hollow rotating shaft and a spraying device on one side of a stirring rod, other microorganisms are prevented from entering the microbial agent from a feeding port along with the anti-oxidation buffering agent after the feeding port is opened, and the microbial agent is prevented from being polluted to influence the purity of the product.

The invention discloses a preparation process of neodymium iron boron (NdFeB) ultrafine permanent magnet powder , which comprises the steps of raw material treatment, vacuum melting, cooling molding,rapid crushing, rapid screening, jet milling and secondary screening, and the raw material treatment comprises raw material cleaning, and a plurality of raw materials can be flushed by clear water during cleaning; various raw materials are dried through heating equipment after being flushed, so that dust and impurities on various raw materials can be cleaned. The beneficial effects are that multiple raw materials can be treated during processing, and dust and oil on the raw materials can be treated, so purity of alloy can be prevented from being influenced; then the raw materials are smelted,cooled and formed into the alloy, and then the alloy can be crushed into small alloy particles, so that the collision type fluidized bed jet mill can conveniently and quickly crush the small alloy particles into superfine permanent magnet powder, and the overall processing efficiency is high.

The invention discloses a preparation method of an allyl alkylxanthate collecting agent. Alkylxanthate and halopropene are subjected to liquid-liquid heterogeneous reaction, the two synthesis assistants NF-1 and NF-2 are added, and the synthesis temperature and time are controlled to generate allyl alkylxanthate. According to the allyl alkylxanthate collecting agent prepared according to the method provided by the invention, the product and production wastewater have no irritating peculiar smell, the whole production control process is more environmentally friendly, and the product purity andyield are high.

The invention relates to a preparation technology of 2,2-methylbutanoic acid, and relates to the field of chemical reagent synthesis. The preparation technology of 2,2-methylbutanoic acid includes thesteps that tertiary pentyl magnesyl Grignard reagent and carbon dioxide are subjected to an addition reaction, then hydrolysis is conducted, and finally the 2,2-methylbutanoic acid is obtained; the tertiary pentyl magnesyl Grignard reagent and carbon dioxide are subjected to a carbonyl addition reaction, the preparation technology is easy to operate, raw materials are easy to obtain, the yield ishigh, meanwhile, the prepared product is easy to purify and can reach 99% after purification, and application prospects are good.

The invention provides a method for preparing NaCl industrial salt with desulphurization waste water zero discharge. First, suspensions and colloids in desulphurization waste water are aggregated into large particles and precipitate, then the waste water without suspensions and colloids is evaporated, during the initial period of evaporation, seed crystals are added into the waste water, thus substances easy to scale are precipitated, the precipitated substances easy to scale are discharged, the residual solution system is subjected to condensation, crystallization, dehydration and drying, and NaCl industrial salt with a high purity is obtained. Through a mode of addition of seed crystals, the substances easy to scale in the waste water are precipitated with the seed crystals as crystal nucleuses firstly, then the precipitated substances easy to scale are discharged, the impurity ion content in the waste water system is lowered, the waste water hardness is lowered effectively, scaling on inner surfaces of a waste water processing device can be avoided effectively, and finally production of NaCl industrial salt products with a high purity can be achieved.

The invention discloses a fixed bed reactor for dimer acid production. The fixed bed reactor comprises a base, a reaction tube is arranged on the left side of the upper part of the base, and a mesh box is arranged in the reaction tube. A hollow column is fixedly connected to the middle part of the upper end of the mesh box, a wedge rod is slidably connected into the hollow column, wedge blocks aresymmetrically and slidablty connected into the middle part of the upper surface of the mesh box, elastic connecting rods are arranged on the outer sides of the wedge blocks, and clamping blocks are fixedly connected to one ends of the elastic connecting rods. A feeder is arranged at the upper end of the hollow column, a hydraulic device is fixedly connected to the left side of the feeder, a distillation bottle is arranged on the right side of the reaction tube, a valve tube is fixedly connected to the lower end of the right side of the reaction tube, and a heater is fixedly connected to the middle part of the upper surface of the base. A Y-shaped tube is fixedly connected to the upper end of the right side of the distillation bottle, a condensing tank is arranged on the right side of thedistillation bottle, a liquid squeezing device is arranged on the right side of the condensing tank, and a liquid collecting pipe is fixedly connected to the right end of the liquid squeezing device.The fixed bed reactor has the advantages that the catalytic reaction rate can be controlled conveniently, reactants can be simultaneously added, the condensation effect is good and the condensation tube is easy to clean.

The invention discloses a magnetic iron oxide preparing method. The magnetic iron oxide preparing method includes: 1) acidizing ferrous sulfate by an acid; 2) mixing the acidized ferrous sulfate with hydrogen peroxide to enable reaction to prepare a hydroxyl-ferric oxide precursor; 3) subjecting the hydroxyl-ferric oxide precursor and ammonium bicarbonate or ammonium carbonate to neutralization reaction so as to obtain a reaction product; 4) subjecting the reaction product to solid-liquid separation and collecting solid phases; 5) drying and roasting the solid phases sequentially to prepare magnetic iron oxide. The magnetic iron oxide has a lot of lattice imperfections, a lot of active binding sites and a large specific surface area, thereby being high in adsorption capacity and widely applicable to the fields of sewage treatment and gas purification.

The invention provides a graphite hot isostatic pressing forming processing method which comprises the following steps: filling a sheath with a graphite raw material, and arranging inorganic fiber cotton between the graphite raw material and the inner wall of the sheath; after the filling is finished, sealing the sheath and degassing; and carrying out hot isostatic pressing treatment on the degassed sheath, cooling, and removing the sheath to obtain a graphite product. According to the processing method, the graphite product is produced by adopting a hot isostatic pressing method, uniform stress of a graphite raw material is ensured through degassing and hot isostatic pressing processes, molding processing of powder or improvement of density of a block material is facilitated, an isotropic graphite product can be obtained through processing, improvement of mechanical properties such as graphite strength and the like is facilitated, and the service life of the graphite product is prolonged; and according to the method, the inorganic fiber cotton is arranged between the graphite raw material and the sheath, so that the sheath is prevented from reacting with graphite under hot isostatic pressing high-temperature and high-pressure conditions to influence the product purity, and the problem that the graphite is difficult to separate after reacting with the sheath can also be avoided.

The invention discloses a fixed bed reactor for the production of dimer acid, which comprises a base, a reaction cylinder is arranged on the left side above the base, a net box is arranged inside the reaction cylinder, a hollow column is fixedly connected to the middle part of the upper end of the net box, and the hollow column slides inside Wedge bars are connected, and the middle part of the upper surface of the net box is symmetrically slidably connected with wedges. An elastic connecting rod is arranged on the outside of the wedges. One end of the elastic connecting rod is fixedly connected with a clamping block. A hydraulic device is fixedly connected, a distillation bottle is installed on the right side of the reaction cylinder, a valve pipe is fixedly connected to the lower end of the right side of the reaction cylinder, a heater is fixedly connected to the middle part of the upper surface of the base, a Y-shaped tube is fixedly connected to the upper right side of the distillation bottle, and a Y-shaped tube is fixedly connected to the upper end of the distillation bottle. The right side is provided with a condensation box, and the right side of the condensation box is provided with a squeeze device, and the right end of the squeeze device is fixedly connected with a liquid collection pipe; the present invention has the advantages of being convenient to control the catalytic reaction rate, adding reactants at the same time, good condensation effect and condensation tube The advantage of being easy to clean.

The invention discloses a pickling purification method of iron disulfide, and specifically relates to the technical field of compound preparation. The pickling purification method of iron disulfide comprises the following steps: grinding ore containing iron disulfide into ore powder by a grinding apparatus; placing the ore powder in a container, then adding hydrochloric acid to the container, heating the solution in the container, and continuously stirring the ore powder during the heating process; pouring out a solution after reaction, then adding tap water to the container, and repeatedly stirring the ore powder; replacing tap water with pure water, and then carrying out repeated stirring again; and then pumping out the pure water in the container by a vacuum pump, wherein the ore powder after the pure water is discharged is iron disulfide powder. The technical scheme adopted by the method overcomes the problem that an existing iron disulfide production process can introduce other substances to lead to low purity of an iron disulfide product, and thus the method can be used for purification of iron disulfide.

The invention relates to the technical field of oxygen inhalation tube humidifiers, in particular to a humidifier structure of a pneumology department nursing oxygen inhalation tube, which comprises a fixed cover, a control mechanism is mounted on the fixed cover, and a containing mechanism for containing water is mounted at the bottom of the fixed cover. The bottom of the containing mechanism is connected with a placing mechanism for placing an oxygen mask of a patient through a connecting mechanism, a pushing mechanism is installed on one side of the fixing cover, a reinforcing mechanism for reinforcing an oxygen inhalation pipeline is installed on the pushing mechanism, and the reinforcing mechanism is connected with the pushing mechanism. The bottom of the containing mechanism is connected with the placing mechanism through the connecting mechanism, when the patient temporarily leaves the sickbed, a nurse can take off the oxygen mask, rotate the placing mechanism and place the oxygen mask in the placing mechanism, and the situation that dust enters the oxygen mask to affect the oxygen quality when the patient uses the oxygen mask again is avoided.

The invention discloses a method for preparing sodium fluorosilicate by utilizing quartz sand dust. The method mainly comprises the steps of collecting the quartz sand dust, generating a solution containing fluosilicic acid, covering the solution with a composite film layer, and preparing the sodium fluorosilicate. According to the method disclosed by the invention, the bottom of a quartz sand dust collector is treated with chitosan and silica gel microspheres, the surface of the solution containing the fluosilicic acid is covered with the composite film layer, and the above measures all improve the adsorption capacity and adsorption efficiency of the quartz sand dust; and the method utilizes the quartz sand dust and fluorine-containing waste water to prepare the sodium fluorosilicate, themethod has simple operation, greenness and environmental protection, avoids the secondary pollution of the quartz sand dust, and obtains chemical products with high additional value.

The invention discloses a multistage screening device for purifying terrazzo quartz sand. The multistage screening device comprises a support, a rolling screening device, a swing screening device and a material receiving device; the rolling screening device is located on the upper side of the support; and the swing screening device is located on the lower side of the rolling screening device. Quartz sand to be purified is poured into the rolling screening device to achieve preliminary screening; And then the quartz sand enters the swing screening device to be classified and screened twice, impurities doped in the quartz sand are fully screened out, and the purity of the quartz sand is improved.

The invention discloses a preparation method of a creatine phosphate disodium dihydrate. The preparation method of the creatine phosphate disodium dihydrate comprises the following steps of: (a) dissolving creatine into anhydrous acetonitrile, adding phosphorus oxychloride and a triethylamine catalyst under the ice bath condition; stirring for full reaction, so as to obtain reaction liquid, wherein mole ratio of creatine to phosphorus oxychloride to triethylamine is 1:(1-1.5):(6-8); (b) adding water into the reaction liquid, hydrolyzing, then adding absolute ethyl alcohol, and separating out crystals; (c) filtering, drying a filter cake, adding ethanol water, and recrystallizing, so as to obtain pure creatine phosphoric acid; (d) dissolving the pure creatine phosphoric acid into ethanol water, adding sodium hydroxide, cooling, filtering to obtain a filter cake, dissolving the filter cake into the ethanol water, and recrystallizing, thus obtaining the pure creatine phosphate disodium dihydrate. The preparation method of the creatine phosphate disodium dihydrate has the advantages of small use amount of phosphorus oxychloride during preparation, high safety factor, low cost, high yield, high product purity, short preparation time, high production efficiency and easy operation and control and is suitable for large-scale industrial production.

The invention discloses a purification device for preparation of o-xylene separated from mixed xylene, and relates to the technical field of purification devices. The purification device comprises a bottom plate, two supporting frames are fixedly mounted at the top of the bottom plate, and a cooling unit and an electric heating base which are located below the supporting frames are fixedly mounted above the bottom plate. According to the purification device for preparation of o-xylene separated from mixed xylene, through cooperative use of the electric heating base and a purification cabin and cooperative use of a gas collecting valve and an exhaust pump, when the purification device for preparation of o-xylene separated from mixed xylene carries out purification work, the electric heating base heats the bottom of the purification cabin, and then water in a mixed solvent inside the purification cabin forms steam; meanwhile, the gas collecting valve can be in butt joint with a gas collecting connector, so that the exhaust pump can pump out water steam generated in the purification process in the purification cabin through a gas collecting pipe and the gas collecting connector, and the situation that the water steam remains in the purification cabin and influences the product purity is avoided.

The invention discloses a method for recovering a composite extracting agent in the extraction and separation process of coal tar waste residues. The method includes the steps that a mixed solution which includes the composite extracting agent and coal tar and is obtained after the coal tar waste residues are extracted and separated is fed into a distillation retort, and then water is added and heated to be boiled; the azeotrope formed by the composite extracting agent and the water is volatilized out from the mixed solution; distillate is recycled in a condensation mode so that an oil-water mixture can be obtained; the composite extracting agent and the water are obtained by standing and layering and then are returned to the system to be recycled. The method has the characteristics that the recovered temperature of a furfural and ester composite extracting agent is low, operation is safe and reliable, the handling capacity is large, solvent loss is small, and the water content of tar is lower than 3%.

The invention discloses a cleanable medical equipment liquid stirring device. The cleanable medical equipment liquid stirring device comprises an underframe, wherein the top of the underframe is fixedly connected with a water storage tank, a fixing column and a fixing frame in sequence from front to back; the top of the water storage tank is fixedly connected with a filtering device; the top end of the fixing column is fixedly connected with a stirring tank; the top of the fixing frame is fixedly connected with a motor; a revolving shaft of the motor passes through the stirring tank and extends into the stirring tank; one end, which extends into the stirring tank, of the revolving shaft of the motor is fixedly connected with the stirring device. By adopting the cleanable medical equipment liquid stirring device, the stirring tank can be cleaned, liquid after stirring is prevented from being left in the stirring tank and influencing the purity of stirring liquid in next stirring, a cleaned water body can be filtered and disinfected, and the water body is kept clean, so that the water body is recycled, water resources are saved, waste is avoided, liquid in the stirring tank can be stirred comprehensively, and the stirring quality is ensured.

The invention provides a preparation method of a phenylephrine hydrochloride impurity standard substance, which comprises the following steps: putting an phenylephrine hydrochloride bulk drug under anillumination condition to generate impurities, and obtaining chromatographically pure target impurities by preparative chromatography; in the presence of ketoreductase KRED and reduced coenzyme II NADPH, taking nitromethane and m-hydroxybenzaldehyde as raw materials to react to obtain a concentrate; and finally, recrystallizing the concentrate by using an isopropanol-n-propyl acetate-acetonitrilemixed solution, adding chromatographically pure target impurities neutralized by alkali in the recrystallization process, and salifying to obtain the phenylephrine hydrochloride impurity standard substance (impurity A) which is high in product yield and purity and meets the requirements of drug impurity standard substances.

The invention discloses a method for preparing sodium fluorosilicate by utilizing quartz sand dust. The method mainly comprises the steps of collecting the quartz sand dust, generating a solution containing fluosilicic acid, covering the solution with a composite film layer, and preparing the sodium fluorosilicate. According to the method disclosed by the invention, the bottom of a quartz sand dust collector is treated with chitosan and silica gel microspheres, the surface of the solution containing the fluosilicic acid is covered with the composite film layer, and the above measures all improve the adsorption capacity and adsorption efficiency of the quartz sand dust; and the method utilizes the quartz sand dust and fluorine-containing waste water to prepare the sodium fluorosilicate, themethod has simple operation, greenness and environmental protection, avoids the secondary pollution of the quartz sand dust, and obtains chemical products with high additional value.

The invention discloses a preparation method of low-acrylonitrile 2-acrylamido-2-methylpropanesulfonate. The preparation method comprises the following steps of: preparing a 2-acrylamido-2-methylpropanesulfonate solution by taking 2-acrylamido-2-methylpropanesulfonate powder and an alkaline substance as raw materials; before feeding, determining the content of residual acrylonitrile in the 2-acrylamido-2-methylpropanesulfonic acid powder raw material; in the preparation process, adding an absorbent into a reaction solution, and enabling the molar ratio of the absorbent to acrylonitrile in the added 2-acrylamido-2-methylpropanesulfonic acid powder raw material to be (1.5-2): 1; and after adding the absorbent into reaction solution, carrying out a neutralization reaction in two stages, and preparing the 2-acrylamido-2-methylpropanesulfonate solution with the low acrylonitrile content. The preparation method of the 2-acrylamido-2-methylpropanesulfonate with low acrylonitrile content is innovatively provided for the first time, the acrylonitrile content in the salt solution product prepared by the method is greatly reduced, and the cost is relatively low.

The invention relates to a method for preparing a micro-nano material. The method comprises the following steps: providing submicron particles; adding a prepolymer monomer solution having a carbon content of 50% or more and an initiator to the submicron particles to obtain polymer-coated submicron particles, wherein one of the prepolymer monomer solution having the carbon content of 50% or more and the initiator is respectively added; and sintering the polymer-coated submicron particles to prepare a micro-nano material of carbon-coated nanoparticles. The invention relates to a micro-nano material prepared by the method, and a battery prepared by the micro-nano material. The micro-nano material prepared by the method has the advantage that a carbon structure with stable properties can be coated on the surface of the nanoparticle so as to solve the problem of the instability of the nanoparticle.

The invention discloses a preparation method of 1-(4-chlorphenyl)-2-cyclopropyl-1-acetone. The preparation method comprises the steps that: (1) cyclopropyl methyl ketone, dimethyl sulfate, dimethyl sulfide and sodium hydroxide take epoxidation reaction to obtain 2-cyclopropyl-2-methyl propylene oxide; (2) the 2-cyclopropyl-2-methyl propylene oxide is catalyzed and re-ranged by anhydrous zinc chloride at the room temperature to obtain 2-cyclopropyl propionaldehyde; (3) the 2-cyclopropyl propionaldehyde is oxidized by 40 percent oxydol at the room temperature to obtain 2-cyclopropyl monoprop; (4) the 2-cyclopropyl monoprop and thionyl chloride take reaction to obtain 2-cyclopropyl propionyl chloride; (5) the 2-cyclopropyl propionyl chloride takes reaction with chlorobenzene and anhydrous aluminum trichloride to obtain the 1-(4-chlorphenyl)-2-cyclopropyl-1-acetone with the content being 98.0 percent to 98.7 percent, and the total yield is 80.0 percent to 83.1 percent. The preparation method has the advantages that the steps are simple, raw materials are cheap and are easy to obtain, easy-self-ignition compounds are not used, organic solvents are not used in the steps (2) and (3), three wastes are few, and the preparation method is suitable for industrialization.

The invention discloses a washing method of an insulin detemir crystal. The method comprises the following steps: (1), removing a crystallization solution after crystallization reaction is accomplished, and adding a weak acid salt solution to wash the left insulin detemir crystal for the first time; (2), removing a washing liquid produced during the washing for the first time, and adding the weak acid salt solution to wash the left insulin detemir crystal for the second time; (3), removing a washing liquid produced during the washing for the second time, and adding water for injection to wash the left insulin detemir crystal for the third time; and (4), removing a washing liquid, and freezing the insulin detemir crystal. The method can efficiently wash the crystallized insulin detemir crystal, the washed insulin detemir crystal is completely kept, the sample yield is high, and the sample purity is not affected. The washing method is simple to operate, low in cost and suitable for industrial large scale production.