219results about How to "Less impurities" patented technology

A silicon oxide film is deposited by rotating a rotation table on which a wafer W is placed to allow BTBAS gas to be adsorbed on an upper surface of the wafer W and supply a O₃ gas to the upper surface of the wafer W for allowing the BTBAS gas adsorbed on the upper surface of the wafer W to react. After depositing the silicon oxide film, a reforming process is performed every deposition cycle by supplying a plasma of Ar gas to the silicon oxide film on the wafer from an activated gas injector.

This invention relates to carbonylation of methanol, methyl acetate, dimethyl ether or mixtures thereof to produce glacial acetic acid, and more specifically to the manufacture of glacial acetic acid by the reaction of methanol, methyl acetate dimethyl ether or mixtures thereof with carbon monoxide wherein the product glacial acetic acid contains low formic acid impurities.

The invention discloses a synthesized mica crystal plate with high flexibility and high splitting performance as well as a preparation method, the method is characterized in that in a formula for melting the synthesized mica, 0.1-0.6% of CaO (by referring calcium oxide, not specially referring calcium oxide) is introduced as an impurity enrichment agent, thereby the impurity can be enriched, and the flexibility and splitting performance of the synthesized mica can be enhanced, the flexibility of the obtained synthesized mica crystal plate can reach 38-50% (a winding method), 0.1-0.6% of CaO is contained, the thickness of the obtained powder plate is 0.05-0.8mum, especially 0.05-0.5mum. The synthesized mica crystal plate is used for preparing the ultrathin synthesized mica crystal powder, and can be used for industries of thermostability base materials, cosmetics, anticorrosive paints and engineering plastics.

The invention relates to a method for producing high-purity vanadium pentoxide, which comprises the following steps: performing dissolution, namely adding crude ammonium metavanadate into an aqueous solution, and adding ammonia water under the stirring condition when heating the solution to be between 80 and 90 DEG C until the ammonium metavanadate is completely dissolved; adding different impurity removal reagents to separate impurities; filtering the solution after the impurities are separated; placing the filtered solution into a reaction kettle, adding an oxidant, and oxidizing bivalent vanadium into quinquevalent vanadium; acidifying the completely oxidized solution and separating out brown vanadium pentoxide; performing vacuum filtration and dehydration drying on the brown vanadium pentoxide; and placing the dried vanadium pentoxide into a rotary oven for calcination. The production method uses equipment such as a disk-type vacuum filter, the reaction kettle and the rotary oven.The vanadium pentoxide produced by the method has high purity and few impurities, and is used in the fields of organically synthesized catalyst and aerospace. The method has simple production equipment and high production benefit, and is suitable for industrial mass production.

A copper chromium zirconium alloy comprises, by weight, 0.7% to 2.0% of chromium, 0.05% to 0.3% of zirconium, 0.01% to 0.08% of magnesium, 0.01% to 0.1% of yttrium and the balance copper. The invention further provides a preparing method of the copper chromium zirconium alloy. The preparing method sequentially comprises the following steps that firstly, the copper, the chromium, the zirconium, the magnesium and the yttrium are prepared according to the proportion and are subject to vacuum purified smelting and flow dividing type casting, and a casting blank is prepared; secondly, the casting blank is subject to homogenization treatment and hot extrusion, and a sheared billet is prepared; thirdly, the sheared billet is subject to solid-solution treatment; fourthly, the sheared billet obtained after the solid-solution treatment is subject to cold deformation machining; and fifthly, a material obtained after cold deformation machining is subject to aging treatment, and the needed copper chromium zirconium alloy is obtained. The copper chromium zirconium alloy has the good comprehensive performance, the room temperature tensile strength of the copper chromium zirconium alloy is larger than 520 MPa, the room temperature elongation of the copper chromium zirconium alloy is larger than or equal to 22%, the room temperature electric conductivity of the copper chromium zirconium alloy is larger than or equal to 90%IACS, and the 350 DEG C high-temperature tensile strength of the copper chromium zirconium alloy is larger than 390 MPa.

The invention relates to a preparation process for extracting crude sodium heparin from pig lungs, which comprises the following steps: mincing fresh pig lungs into slurry, carrying out heat insulation and enzymolysis to obtain an enzymolysis liquid, filtering the enzymolysis liquid to collect filtrate, carrying out ion exchange adsorption treatment on the filtrate, washing and eluting resin, precipitating sodium heparin, and drying to obtain crude sodium heparin. The enzymolysis method employed by the invention can thoroughly dissolve pig lung slurry and effectively improve and stabilize the quality of the product and the yield of sodium heparin; and simultaneously, the obtained crude sodium heparin has low impurity content and high titer.

The invention discloses a nylon 6 slice prepared by using a waste fishing net. A raw material of the nylon 6 slice comprises the following components in percentage by weight: 95 to 98 percent of the waste fishing net, 0.5 to 1.0 percent of chain extender, 1.0 to 3.0 percent of compound heat stabilizer and 0.5 to 1.0 percent of lubricant. The nylon 6 slice has mechanical properties and mobile processing performance equivalent to that of a PA6 fresh material slice, has a light color and fewer impurities, can partially or completely replace a nylon 6 fresh material slice to be used for spinning or modifying engineering plastics and other raw materials, reduces environmental pollutions, realizes the cyclic utilization of resources, and has great social effects and economic benefits.

An electrostatic separation apparatus for conductive particles and insulating particles with reduced separation time and improved separating capability, comprises a substantially flat-plate shaped bottom electrode (26) provided on lower side, a substantially flat-plate shaped mesh electrode (22) provided above the bottom electrode (26) as spaced a predetermined distance apart from the bottom electrode (26) and having a number of openings (24) to allow particles to pass therethrough, a direct current power supply connected to at least one of the mesh electrode (22) and the bottom electrode (24), and a voltage is applied across the bottom electrode (22) and the mesh electrode (24), thereby forming a separation zone (10) between the electrodes.

The invention relates to the technical field of medical chemistry and particularly relates to Axitinib fumarate, a crystal form thereof and preparation methods for the Axitinib fumarate and the crystal form thereof. The prepared Axitinib fumarate and the crystal form thereof are high in Axitinib fumarate yield and high in purity. In addition, the Axitinib fumarate provided by the invention can further be used for preparing Axitinib after the Axitinib fumarate is dissociated. According to the preparation method for the Axitinib fumarate, disclosed by the invention, the Axitinib fumarate is prepared through subjecting the Axitinib and fumaric acid to a salt forming reaction. The Axitinib may be a direct crude product prepared by disclosures in the existing documents, or may also be pure Axitinib which is obtained through carrying out certain-aftertreatment impurity removal. Even if crude Axitinib and fumaric acid are subjected to salt forming, the Axitinib fumarate with high purity can be prepared through the salt forming reaction.

The invention relates to a rapid preparation method for a MSi2O2N2:Eu<2+> phosphor. The rapid preparation method comprise the following steps of (1) weighing raw materials of silicon oxide, silicon nitride, alkaline earth oxide and europium oxide according to a molar ratio and in terms of the chemical formula M1-xSi2O2N2:Eux<2+>, then mixing the raw materials uniformly, and obtaining uniformly mixed raw material mixed powder; (2) putting the raw material mixed powder into a graphite die, directly applying a strong current to the upper and lower ends of the graphite die and heating to a temperature in a range from 1400 DEG C to 1550 DEG C in a protective atmosphere, maintaining the temperature for 0-20 min and cooling naturally, and obtaining the MSi2O2N2:Eu<2+> phosphor. The rapid preparation method is advantaged by fast heating rate, short holding time, and high conversion efficiency of phosphor synthesis, the synthetic phosphor need not be broken into pieces, the synthetic MSi2O2N2:Eu<2+> phosphor has a wide excitation wavelength range, has high emitted light intensity, and can be effectively excited by ultraviolet and blue light LED chips.

The present invention discloses the extraction process of lotus leaf flavone. Fine lotus leaf flavone powder is prepared with lotus leaf as material and through five links of pre-treatment, percolating extraction, macroporous resin adsorption to separate, purification with organic solvent and post-treatment. The fine lotus leaf flavone powder of the present invention has stable chemical property, less impurity, high water solubility and other features; has flavone content of 50-70 wt%; and reaches the requirement as class-II medicine material.

The invention relates to the field of extraction and purification of plant effective components, and especially provides a method for separating mogroside V from grosvenor momordica fruits. The methodfor separating mogroside V comprises the following steps: addition of water to grosvenor momordica fruits, pulping, phytoenzyme enzymatic hydrolysis, biological enzyme hydrolysis, collection of the obtained enzymatic hydrolysate, enzyme deactivation, yeast fermentation, composite anion-cation exchange resin purification, and concentration drying for preparing the mogroside V. The product preparedthrough the production method has the advantages of snowy white color, no bitterness, small solvent residual, no pesticide residue and stable quality; and the content of the mogroside V in the product is greater than 60%, and total glycoside content of the product is greater than 90%.

The invention discloses a method and a system for refining cyclohexanone and recycling cyclohexanol. The method is characterized by comprising the following steps: sending an alcohol ketone mixture into a light-component removal tower for removing light components, sending the material discharged from the tower bottom into a cyclohexanone product tower, acquiring a high-purity cyclohexanone product from the tower top and a crude product mainly comprising cyclohexanol from the tower bottom, then sending the crude product into a cyclohexanol recovery tower, and acquiring cyclohexanol from the tower top; mixing the acquired cyclohexanol with proper amount of water, heating and sending into a cyclohexanol dehydrogenation reactor for dehydrogenation, so as to obtain a mixed product containing cyclohexanol, cyclohexanone and water, performing two-stage cooling on the dehydrogenated product, then performing gas-liquid separation, sending the gas phase and the liquid phase into a dewatering tower for dewatering processing, sending oil-containing wastewater removed at the tower top to a cyclohexane extraction tower, sending an obtained upper-layer oil phase to an alcohol-ketone recovery tower, and sending an oil phase containing cyclohexanone and cyclohexanol and obtained at the bottom of alcohol-ketone recovery tower to a dewatering tower for cycling. The invention comprises the advantages that the product cyclohexanone is high in purity, cyclohexnoal is efficiently converted into cyclohexanone at a high yield, and the system is high in energy integration degree and low in energy consumption.

The invention relates to sulphydryl single-element or multi-element organic acid surface-modified No.2-No.6 semiconductor quantum dots and a preparation method thereof. The method comprises the following steps of preparation of a precursor solution, preparation of quantum dots, and the like. The sulphydryl single-element or multi-element organic acid surface-modified No.2-No.6 semiconductor quantum dots are the quantum dots formed by CdX (X=S, Se, Te) or ZnX (X=S, Se, Te) which is coated by sulphydryl single-element (or multi-element) organic acid, wherein the mol ratio of the sulphydryl single-element (or multi-element) organic acid to the CdX or the ZnX is between 2:1 and 3:1; and particle diameter of the quantum dots is between 2.0 and 6.0 nanometers. The invention takes gas as a tellurium (or sulfur or selenium) source, and reduces impurity compositions of the precursor solution by introducing H2X (X=S, Se, Te); and due to the superior hydrophilicity of the sulphydryl single-element (or multi-element) organic acid, the prepared No.2-No.6 semiconductor CdX (X=S, Se, Te) and ZnX (X=S, Se, Te) quantum dots,, and the like have good dispersity and wide fluorescent range, and have the quantum yield as high as more than 80 percent. Simultaneously, the quantum dots have small toxicity, good biocompatibility and easy operation, and can be used for medicament tracking, diagnostic marking, and the like.

This invention relates to a method for extracting the effective components from Cnidium monnier. The method comprises: (1) pulverizing Cnidium monnier fruits, and sieving with a 20 mesh sieve; (2) extracting in a supercritical extraction apparatus to obtain Cnidium monnier extract; (3) dissolving Cnidium monnier extract with the same amount of ether under ultrasonication, filtering, adding the same amount of petroleum ether to the filtrate, standing at a low temperature, and filtering to obtain crystalline substances and the filtrate; (4) recrystallizing the crystalline substances with ethanol to obtain imperatorin; and (5) volatilizing ether from the filtrate, standing at a low temperature, and filtering to obtain crystals; (6) recrystallizing with ethanol to obtain osthole. The purity of the obtained compounds can be determined by thin-layer chromatography, high performance liquid chromatography and melting point detection method. The method has such advantages as high product purity, high yield, good repeatability, simple process, low toxicity.

The invention discloses an extracting method for an adenium obesum leaf cell extract. The extracting method comprises the following steps: taking fresh adenium obesum leaves and crushing the fresh adenium obesum leaves; feeding raw material powder into a supercritical extraction kettle to perform supercritical CO2 extraction; taking and feeding an extracting mixture into a supercritical separation kettle to perform separation; adding separation products into distilled water to distill, and condensing and recycling steam to obtain the adenium obesum leaf cell extract. The extract is applied to a skin care product. Compared with the prior art, the extracting method can quickly extract much adenium obesum leaf cell extract on the premise of not damaging natural active ingredients of the adenium obesum, so that the yield is high, the impurities are few, solvent residues are avoided, and the natural characteristics of the extract are kept.

The invention relates to a method for separating and purifying fraxetin, fraxin, aesculin and aesculetin from ash bark. The ash bark serves as a raw material and the method includes the steps of preparation of ash bark extract: performing reflux extraction on smashed ash bark crude drugs through ethanol or methanol, and obtaining extract coarse powder after the extract liquid is processed after the recovery of the solvent; and column chromatographic purification: taking Superose12 as a separating medium to perform chromatographic separation and purification, taking methanol-water or ethanol-water as the eluent to obtain high-purity monomeric compounds of fraxetin, fraxin, aesculin and aesculetin. The technical process is environment-friendly.

The invention discloses a novel preparation method of Fe-MOF (ferrous-metal oxide framework) and an application thereof in desulfurizing field. The preparation method comprises the following steps of adopting an electrochemical method, using a metal element of Fe (iron) as an anode, and using 66.7 to 80vol% ethanol solution as an organic solvent; using an anode dissolving method to enable the dissolved-out Fe3+ ion and the H3BTC in an electrolyte solution to generate coordination reaction, so as to generate a sample; washing and drying the sample, so as to obtain the FeBTC catalyst. The preparation method has the advantages that the mixing of anion ion impurities of metal salt is avoided, the prepared sample is pure, the synthesis condition is moderate, the reaction is quick, and the reaction time is short; the prepared Fe-MOF catalyst is applied into medium-low temperature hydrolysis reaction of carbonyl sulfide, the activity and stability are good, and a novel COS (carbon oxysulfide) hydrolysis catalyst is developed.

The invention relates to a TiAl/Ti3SiC2 composite plate material and a preparation method thereof, which belongs to the field of composite material preparation. The TiAl/Ti3SiC2 composite plate material comprises a TiAl base alloy layer and a Ti3SiC2 ceramic layer, wherein a raw material blank of Ti3SiC2 ceramic is overlapped with a raw material blank of TiAl base alloy; more than two layers are overlapped; an obtained layered blank material is subjected to vacuum hot-pressing and sintering for 1-3 hours at 1400-1600 DEG C under the sintering pressure of 20-30MPa, thereby obtaining the TiAl/Ti3SiC2 composite plate material. The preparation of the TiAl/Ti3SiC2 composite plate material can be accomplished by one-time operation, the production process is simple and feasible, and the preparation cost is low. The preparation process is free of pollution, the composite plate material is good in boundary binding, and the number of alternative overlapped layers of the TiAl layers and the Ti3SiC2 layers can be adjusted.

The invention relates to a solid phase synthesis method for extrasin beta4. A large long chain peptide is decomposed into a plurality of parts of small short chain peptides; short peptide chain fragments with full protection side chains are obtained through the synthesis; and then various short peptide chain fragment units are assembled to obtain a final long peptide product. The method has the advantages that the method avoids the crosslinking polymerization problem of a long peptide generated in the synthesis process; in addition, a plurality of short peptide fragments can be synchronously synthesized in parallel, which greatly shortens the total synthesis time; moreover, short peptides can obtain an intermediate product with higher relative purity, thereby ensuring that the final product has relatively fewer impurities and the impurities are easy to separate and purify.

The invention discloses a fluoride removal method of graphite purification waste water and a processing system. The fluoride removal method comprises the step that the graphite purification waste water is subjected to diffusing dialysis, so as to recover acid therein. Diffusing dialysis processing liquid is neutralized and filtered through two steps, and obtained neutralized filter liquor is in contact with a fluoride removal filter material to remove fluoride, so that fluorine content in obtained effluent reaches the standard, and the effluent reaches the effluent standard. The waste water continuously runs in the processing system, and effluent obtained by processing is recycled in the system. By adopting the processing method provided by the invention, through applying the processing system provided by the invention, not only can the fluoride in the waste water can be effectively removed, but also the waste water processing cost can be obviously reduced, the whole system runs stably, and the operation is simple. Continuous and automatic running can be realized.

The invention relates to stable magnesia-calcium sand. The stable magnesia-calcium sand is characterized by being prepared from the following components in percentage by weight: 53-55% of light-burned dolomite, 32.5-35.5% of caustic-calcined magnesite, 11-14% of silica fine powder, 1-1.5% of a stabilizer and 1-1.5% of Fe2O3 which is taken as a sintering agent. The preparation method comprises the following steps: mixing; molding; drying; holding the temperature at 1650-1700 DEG C for 3-6 hours; and sintering. The stable magnesia-calcium sands provided by the invention maintain a good high-temperature performance and CaO exists in form of combined-state beta-2CaO.SiO2 and 3CaO.SiO2 so that the problem that a magnesia-calcium material is easily hydrated is solved. Under the condition of no hydration prevention measures, the requirements for production, long-term storage and application can be satisfied. The product has the following main balanced phase components at a high temperature: periclase, beta-2CaO.SiO2 and 3CaO.SiO2 which are high-melting-point mineral phases, the lowest eutectic point temperature of the three is about 1850 DEG C. A burnt brick is prepared by using the stable magnesia-calcium sands, the refractoriness under load of the burnt brick is greater than 1650 DEG C, and the good high-temperature performance of the magnesia-calcium material is maintained.

The invention discloses a zinc selenide single crystal growing method and a zinc selenide single crystal growing container. The method uses zinc and selenium as raw materials and iodine as a vapour phase reaction promoter, and further completes the growth of a zinc selenide single crystal in an ampoule. The method sequentially comprises the following steps: comprehensively cleaning the ampoule, feeding the materials into the ampoule and evacuating the ampoule, sealing the ampoule, cleaning a growing area of the sealed ampoule with hot water, growing crystals, cooling the crystals, and the like. The ampoule has the basic structure that: a raw material area is easy to mix Zn and Se elementary substances; and the growing area consists of a conical body formed by the tangency of two sections of arcs on the cross section of a middle axis of the ampoule. The technical scheme adopted by the invention can grow zinc selenide single crystals of a diameter of 12 to 20mm, and also can be applied to the preparation of other II-VI group compound semiconductor crystals. The grown zinc selenide single crystals have the characteristics of integral structure, good uniformity, small stress, low cost,and simple process.

The invention discloses a production method of a low-Cl-oilless cerium carbonate product with large specific gravity, mother liquor in the production of crystal cerium nitrate is taken as a raw material, and 30% ammonium bicarbonate water solution is taken as a precipitant for synthesizing the low-Cl-oilless carbonate product with the large specific gravity. The production method comprises the steps of using the 30% ammonium bicarbonate water solution to remove oil and iron in raw material solution, then controlling the precipitation time and the precipitation temperature, washing for a plurality of times with deionized water for removing non-rare earth impurities, then carrying out hydration in a centrifuge, and obtaining the low-Cl-oilless carbonate product with the large specific gravity, wherein Cl- in the product is not more than 50ppm, and REO is not less than 65%. The use of the production method can effectively treat the problem of treatment of the cerium nitrate mother liquor in the production of the crystal cerium nitrate, and convert the cerium nitrate mother liquor with higher content of impurities into the low-Cl-oilless cerium carbonate product with the large specific gravity with lower content of the impurities and higher purity by high-temperature precipitation after regulating the PH and removing the oil and the iron by using the ammonium bicarbonate water solution.

The invention belongs to the technical field of hyaluronic acid gel preparation, in particular to a preparation method of a polyvinyl alcohol crosslinked hyaluronic acid gel, and the preparation method comprises the following steps: S1, preparing a polyvinyl alcohol solution; S2, preparing a hyaluronic acid solution; S3, adding the polyvinyl alcohol solution into the hyaluronic acid solution, stirring and mixing uniformly; S4, freezing and thawing the mixed solution; S5, repeating the step S4 for many times; and S6, obtaining the polyvinyl alcohol crosslinked hyaluronic acid gel after cleaning. The invention also provides the polyvinyl alcohol cross-linked hyaluronic acid gel prepared according to the method, the polyvinyl alcohol cross-linked hyaluronic acid gel has high purity and transparency, can be used for producing medical or preventive products, is used for injection, tissue repair and tissue enhancement of animals, especially human beings, has good biocompatibility and degradability, and is clinically safe.

The invention relates to a method for reducing wood tar in the preparation process of wood vinegar, which belongs to the field of wood vinegar. Aiming at the defects that since a large amount of wood tar is generated in the preparation process of the wood vinegar, and the removing process of the wood tar is complex, the refining of the wood vinegar is disadvantageous, the invention provides the method for reducing the wood tar in the preparation process of the wood vinegar. The method comprises the following steps of crushing wood into particles and then placing the particles in a fermentation tank for fermenting; laying a layer of millets below a high-temperature furnace; stacking the wood particles on the millets; spraying rice bran on an upper layer; collecting at three temperature intervals to obtain crude wood vinegar; performing reduced pressure distillation to remove water and then sealing and standing; adding a NaCl solid in the liquid for hydraulic freezing treatment and filtering; extracting the obtained wood vinegar with diethyl ether and recovering to prepare the refined wood vinegar. According to the method, the wood tar in the wood vinegar in the preparation process can be effectively removed, and the finally-prepared wood vinegar is high in purity and less in impurity; in addition, the method is simple in process and low in cost.

The invention discloses a process method for reopening an old furnace of a cored line-frequency induction electric furnace for producing a copper-nickel alloy, comprising the following steps of: adding impurity components obtained by alloying and smelting electrolytic copper for diluting a smelt groove die before stopping the cored line-frequency induction electric furnace for producing the copper-nickel alloy; introducing cooling water before opening the furnace, feeding 240 V of electricity to check a main circuit, a control loop and a cooling water system in a short time; inducting and heating to smelt the smelt groove die by an iron core coil to communicate the smelt groove die by adopting a mode of adjusting the voltage to gradually and stably rise; and heating an upper hearth and the smelt groove die while feeding electricity and baking to smoothly fuse the smelt groove die in a short time. The invention ensures the reuse of the old furnace, prolongs the absolute service life of the cored line-frequency induction electric furnace, saves the fees of the cored line-frequency induction electric furnace for building and casting the furnace and reduces the production cost of each ton of products.

The invention discloses a purifying method of (S)-4-hydroxyl-2oxo-1-pyrrolidine acetamide. The method comprises the following steps of: dissolving (S)-4-hydroxyl-2oxo-1-pyrrolidine acetamide into an optimum solvent; preparing into a saturated solution at the room temperature; and diffusing with a poor solvent in the enclosed environment. (S)-oxiracetam prepared with the purifying method of (S)-oxiracetam has a small quantity of impurities and high purity which can be more than or equal to 99.5 percent; the method has the advantages of simple preparation process, mild reaction condition, easiness for controlling and low preparation cost simultaneously; and meanwhile, a stable (S)-oxiracetam crystal can be obtained with the method disclosed by the invention.

The invention discloses a preparation method of sulfur hexafluoride. The preparation method comprises the following steps: reacting fluorine gas with gaseous sulfur to generate crude sulfur hexafluoride gas; carrying out pyrolysis, washing, water removal, acid removal and rectification treatment on the crude sulfur hexafluoride gas to obtain sulfur hexafluoride products; detecting the products; conducting correlative treatment on unqualified sulfur hexafluoride products until qualified products are obtained; and recycling the tail gas separated from rectification treatment. The method provided by the invention adopts fluorine gas prepared by an electrolytic method and high-quality sulfur as raw materials for reaction, and the generated crude sulfur hexafluoride gas contains less impurities, so as to save a purification process and reduce the energy consumption; indexes of the prepared sulfur hexafluoride are better than those of the national standard GB / T 18867-2002 Gas for electronic industry-sulfur hexafluoride; the tail gas is recovered to reduce pollution and increase yield; and unqualified products under different conditions are controlled.

The invention discloses a permanent magnet sampling detection pharmaceutical device. The permanent magnet sampling detection pharmaceutical device comprises a base. A through groove is formed in the upper surface of the base in the length direction, a conveying mechanism is arranged in the through groove, and a steam disinfection mechanism, a drop pill filling mechanism, a bottle cap hot-press sealing mechanism and a medicine sampling device are sequentially arranged on the upper surface of the base in the length direction. The permanent magnet sampling detection pharmaceutical device has the advantages of being simple in structure and high in practicality.