66results about How to "Prevent purity" patented technology

The invention discloses a co-production method for methyl benzoic acid and phthalic acid. The co-production method comprises the following steps: (1) continuously introducing fresh dimethylbenzene, a catalyst and oxygen-containing gas into a primary oxidation reactor for a reaction to obtain a primary oxidation reaction solution containing methyl benzoic acid and an eight-carbon oxygen-contained compound; (2) carrying out continuous cooling, crystallization and filtration on the primary oxidation reaction solution to obtain filter liquor and filter cake, circulating 1-98% of the filter liquor back the primary oxidation reactor continuously, and continuous rectifying the filter cake continuously, to obtain a low-boiling point front cut fraction, distillation raffinate and a methyl benzoic acid product separately; (3) adding the remaining filter liquor in the step (2) and the obtained front cut fraction and distillation raffinate in the step (2) into a secondary oxidation reactor continuously, and meanwhile continuously introducing a Co/Mn/Br catalyst, acetic acid and oxygen-containing gas into the secondary oxidation reactor for an oxidation reaction to obtain a secondary oxidation reaction mixture; and (4) continuously cooling, crystallizing and filtrating the secondary oxidation reaction mixture to obtain a filter liquor and a phthalic acid product. The co-production method has advantages of a simple process, a low cost, a high yield, good selectivity, good economic benefits, and environmental protection.

The invention relates to a powder preparation method for an induction heating and radio frequency plasma combined atomizing powder system. The powder preparation method comprises the following steps that (1), raw materials are prepared and processed; (2), the system is pre-vacuumed and a protective atmosphere is established; (3), wire materials are straightened and conveyed; (4), high-frequency induction preheating is carried out; (5), radio frequency plasma melting is carried out; (6), powders are prepared by atomizing; (7), separation and dust removal are carried out; and (8), the powder size is graded. The powder preparation method for the induction heating and radiofrequency plasma combined atomizing powder system uses high purity metal wire material instead of the powders as the raw materials, so that the carrying of raw materials to adsorb gas and water is reduced; a technology of the high frequency induction heating combined with the radio frequency plasma smelting and gas atomization is adopted, during the whole process of heating, melting, and the gas atomization is free of pollution and impurities in the protective atmosphere, and the degree of superheat of liquid flow ordroplets is increased during the process of radio frequency plasma smelting; and high quality spherical powders can be obtained by adopting high pressure atomizing nozzles atomizing, and the yield ofmetal powders per unit time is increased.

The method includes liquid extraction and filter processes. Iron powder being more than mercury content is added into the above extracted and filtered solution. The mercury is removed and an amount of Fe(NO3)3, Fe(NO2)3, Zn(NO3)2, Mn(NO3)2 are added. The total metal ionic concentration is made to be 1mol/L. MnO: ZnO: FeO=0.6:0.4:1.0 (mol ratio).After the above solution is heated, the citric acid is added. After evaporation the sol is obtained. After drying the sol the xerogel is obtained. After xerogel is calcinated, the manganese-zinc ferrite is obtained.

The invention discloses a preparing method for high-purity sanshoamides. The preparation method comprises the following steps: a supercritical carbon dioxide extraction technology and a molecular distillation technology are combined, zanthoxylum oil resin which is obtained through supercritical extraction is used as a raw material, pre-treatment, and evaporation and molecular distillation are performed on the raw material to prepare the sanshoamides. The utilization rate of the raw material in the preparation method is high, the content of the sanshoamides in the obtained sanshoamides products is 720mg/g-850mg/g, and the purity of the products is high.

The invention discloses a purification and separation method of a syngas by FTrPSA, and relates to the technical field of H2 production, CO production and purification and separation for a PSA gas. Compared with the prior art, the purification and separation method of the syngas by FTrPSA disclosed by the invention separates coarse removal and refined removal of impurities of acidic components and the like in the syngas purification process, an intermediate gas is refined by the syngas and subjected to an intermediate temperature PSA separation process to obtain a qualified syngas product or H2 and CO products, the operating temperature and operating pressure are the same as those of an intermediate temperature PSA concentration process, so that the load and energy consumption of the syngas in the refining and intermediate temperature PSA separation are reduced, the integration degree of purification and separation process and the purity of the produces are improved, furthermore, a concentrated gas is subjected to a membrane separation process to obtain further recycled syngas and remove the acidic components, so that the load of the membrane separation process is reduced and the yield of the products is improved.

The invention provides a method for preparing a high thermal stability double layer diffusion impervious layer material. The method is characterized in that a direct current magnetron sputtering process is employed, accurate control of N content in an amorphous TaN film is realized by regulating N air flow rate, a high performance double layer Ru/TaN diffusion impervious layer structure with different N content is prepared, the effective work is stably as high as 650 DEG C. N atoms in gap of the TaN film are diffused during the annealing process and then raise the diffusion impervious performance of the Ru/TaN bilaminar membrane. The thermal stability double layer diffusion impervious layer material can be obtained by accurately controlling the N content, and is capable of keeping excellent electrical performance and better ensuring its practical application. The invention has the advantages of simple operation, good repeatability and good realization effect.

The invention discloses a preparing method of manganese-zinc ferrite by using waste alkaline manganese dioxide battery belonging to the preparing method of magnetic material. The technology problem resolved in the invention is producing manganese-zinc ferrite directly by the metal in waste alkaline manganese dioxide battery, to realize the renewable resources of waste battery with simple preparing method, low consumption energy, low cost, high additive value. The technical project of the invention is sol-gal process including liquid leaching, filtering for removing insoluble matter, adjusting solution components, making sol-gel, burning xerogel in the temperature of 600-650 degree centigrade or burning xerogel for manganese-zinc ferrite product. The invention is used for producing manganese-zinc ferrite by waste alkaline manganese dioxide battery.

The invention discloses a method for preparing vitamin C with low consumption, which comprises the following steps: (a) preparing fermented liquor produced by the vitamin C through a two-step fermentation method, and adding a flocculating agent into the fermented liquor to perform sediment; (b) adding strong alkali into the fermented liquor to adjust the pH value; (c) performing member ultra-filtration and decolorizing treatment on the fermented liquor to obtain sodium gulonate crystal; and (d) performing esterification reaction, conversion reaction and acidification reaction on the sodium gulonate crystal, and filtering the reaction product to obtain coarse Vc. The method further improves the quality and increases the yield of the vitamin C, simplifies the production process and reduces the production and manufacturing costs.

The present invention provides a device and method for preparing flake powder, wherein the device includes a melting device, and a nozzle is arranged on the melting device; a gas atomizing device, the gas atomizing device is arranged below the nozzle; A turntable, the turntable is arranged below the gas atomizing device, and the surface of the turntable close to the gas atomizing device is an inclined plane, and the turntable rotates at a certain speed; and a discharge collecting device , the discharging and collecting device is arranged below the rotary disc. The flake powder preparation device of the invention has the advantages of simple structure, low cost, low energy consumption, convenient operation and no pollution, and can be applied to continuous industrial production for preparing flake metal powder, flake amorphous and flake quasicrystal. and flaky microcrystalline powder.

The invention discloses a chemical synthetic method, and specifically relates to a preparation method of dialkyl phosphinate. The preparation method comprises the following steps of: adding a small amount of a reaction auxiliary agent into reaction raw materials including hypophosphorous acid and/or an alkali metal salt of hypophosphorous acid, and dissolving the mixture into water; then transferring the mixture into a pressure kettle; performing nitrogen replacement, and then heating to raise the temperature; introducing alkene, and then adding an initiating agent to react so as to obtain dialkyl phosphinic acid and/or an alkali metal salt of the dialkyl phosphinic acid; and then transferring the dialkyl phosphinic acid and/or the alkali metal salt of the dialkyl phosphinic acid into a reactor, heating to a certain temperature, slowly dropping a solution of a metal salt to obtain a corresponding dialkyl phosphinate deposit, and then filtering, washing and drying to obtain a dialkyl phosphinate product. The preparation method has the advantages that water is used as a reaction solvent system, a specific reaction auxiliary agent is added, and the way of feeding the initiating agent is changed, so that the reaction temperature is lowered, the reaction time is shortened, the product yield and the product quality are improved, and the cost is saved.

The invention relates to preparation and application methods of a cellulose derivative-grafted polylactic acid. The preparation method of the cellulose derivative-grafted polylactic acid comprises thefollowing steps of dissolving cellulose derivatives into solvent, then completely stirring and dissolving in polylactic acid; adding in catalysts and increasing the temperature for reaction; performing vacuum drying to obtain the cellulose derivative-grafted polylactic acid. The prepared cellulose derivative-grafted polylactic acid is applied to fully biodegradable films to improve two-phase interface compatibility, mechanical performance and transparency of a polylactic acid-cellulose composite film. According to the preparation method the cellulose derivative-grafted polylactic acid, the applied polylactic acid is commercial polylactic acid and reacts with the cellulose derivative through transesterification to prepare the cellulose derivative-grafted polylactic acid, which can serve asan interfacial solubilizer for polylactic acid/cellulose composite materials to improve the mechanical performance of the polylactic acid/cellulose composite materials. The preparation method of thecellulose derivative-grafted polylactic acid avoids the problems of high reaction requirements and expensive catalysts of ring-opening polymerization of high-purity lactide monomers and is easy to industrialize.

This invention relates to bi aether style tetracid bi anhydride isomer prepeartion method. N-substitution-4-chlorine phthalic imidine or/and N-substitution-3- chlorine phthalic imidine, bisphenoland anhydrous potassium carbonate are used to generate N,N'-bi substitution bi aether style tetracid bi anhydride different isomer, then the quadric acid imide is hydrolyzed and acidified, and different bi aether style tetracid bi anhydride isomers are got after dewatering. Chlorine benzene anhydride isomer that cheap and easy get is used in this invention, initial material is N-substitution chlorine phthalic imidine made by the chlorine benzene anhydride isomer, so the environmental pollution brought by using materials of nitro substitution acid imide or nitro substitution benzene dinitrile is avoided, and problem of product deep color and low purity is also avoided. The reaction is happened in one tank, so its operation is simple and procedures are saved. Bi aether style tetracid bi anhydride isomer is synthesized first time, especially 3, 4'-bit isomer.

The invention discloses a synthetic process for N,N'-bi(3-dimethylaminopropyl)urea. The synthetic process comprises the following steps: firstly dissolving N,N'-dimethyl-1,3-diaminopropane in an organic solvent, reacting with bi(trichloromethyl)carbonate to obtain hydrochloride of the N,N'-bi(3-dimethylaminopropyl)urea; and adding alkaline liquor for neutralizing, so as to obtain an N,N'-bi(3-dimethylaminopropyl)urea water solution, and removing the solvent through azeotropic water separation, filtration desalination and distillation, so as to obtain a target product of the N,N'-bi(3-dimethylaminopropyl)urea. The synthetic process is high in product yield, high in purity, simple and convenient in operation, and less in three wastes, and suitable for industrial application.

The invention discloses a method for purifying N-phenylmaleimide. The method utilizes an N-phenylmaleimide crude product as a raw material and comprises selecting a distillation kettle with an inner copper block, transferring the N-phenylmaleimide crude product into the distillation kettle, setting kettle pressure of less than or equal to 1.5kPa, heating the N-phenylmaleimide crude product to 90-110 DEG C, carrying out primary vacuum distillation to obtain a front fraction, replacing a receiving bottle when there is no liquid reflux in the distillation kettle under the primary vacuum distillation condition, carrying out heating to 110-130 DEG C, carrying out secondary vacuum distillation to obtain an N-phenylmaleimide fraction, and stopping distillation when there is no liquid reflux in the distillation kettle under the secondary vacuum distillation. The method is free of additives, prevents new impurities, produces a high purity product and has a high yield.

The invention discloses a method for converting nano graphite into one-dimensional carbon nano fiber by laser irradiation, comprising the following steps: 1), selecting a laser energy density reference value according to conversion physical parameters of nano graphite, selecting a laser through the laser energy density reference value, and setting laser process parameters; 2), using the data of step 1) to acquire an optimal laser energy density set value of a one-dimensional carbon nano wire, selecting reasonable laser process parameters by using the optimal laser energy density set value, and using a protective gas to prevent graphite oxidation so as to produce one-dimensional nano carbon fiber; the carbon nano fiber is controllably industrialized; the defects due to chemical methods and other methods are avoided; no waste is caused ,and manpower and material resources are saved.

The invention discloses an LED lamp reuse process. The LED lamp reuse process comprises the following steps: (A) a waste fluorescent lamp recovery box is used for recovering and transferring into a cleaning machine for cleaning; (B) two ends of fluorescent lamps are cut by a cutter, and are smashed; metal chips and plastic chips are respectively conveyed into a metal recoverer and a plastic recoverer; and the metal recoverer and the plastic recoverer are heated; (C) lamp tubes with two cut ends are heated; and (D) the lamp tubes are put in a ultrasonic pool for ultrasonic processing, and are fed in a lamp tube cleaning pool for cleaning the inner walls of the lamp tubes; and finally, ultrasonic processing powder-contained liquid is mixed with lamp tube cleaning pool powder-contained liquid for filtering. The LED lamp reuse process separates and recover fluorescent powder under the condition of not smashing glass, and guarantees the glass recovery quality and the purity of the fluorescent powder.

The invention discloses a synthesis method of 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane and relates to the technical field of organic electroluminescent materials. On the basis of simplifying the synthesis method, wastewater generated by post-treatment is reduced, and the safety of a synthesis process is improved, so that the synthesis method is applicable to industrial production. The synthesis method comprises the following steps: firstly, carrying out a condensation reaction by taking 2,3,5,6-tetrafluoroterephthaloyl chloride andtrialkylsilyl cyanide as raw materials under an oxygen-free and dry environment to obtain an intermediate; and then, removing trialkylsiloxy in the intermediate to obtain F4-TCNQ. The synthesis method of the 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane, disclosed by the invention, is used for synthesizing organic electroluminescent materials.

The invention discloses a regeneration utilization method of a rare earth permanent magnet material. The rare earth permanent magnet material is subjected to regeneration treatment through fives waysof impurity adsorption treatment, chemical solution derusting, permanent magnet material purification treatment, vacuum sintering treatment and post processing treatment, and the regeneration and utilization method comprises the following specific steps of 1, impurity adsorption treatment; 2, chemical solution derusting; 3, permanent magnet material purification treatment; 4, vacuum sintering treatment; and 5, post processing treatment. Treatment is conducted through the steps, impurities and rust spots in rare earth permanent magnet waste can be removed, then the rare earth permanent magnet waste is subjected to secondary purification treatment through even mixing of heterosexual magnetic powder, a binder and a processing agent, the purity degree of the rare earth permanent magnetic material can be improved, and finally, the purity degree and magnetism of the rare earth permanent magnet waste can be improved through a heating and sintering mode.

The invention relates to a method for rapidly determining the content of phenol in wastewater by purge and trap-gas chromatography-mass spectrometry, which comprises the following steps: 1) collecting a wastewater sample, adding phosphoric acid, and adjusting the pH value of the wastewater sample to weak acidity; (2) purging phenol in the wastewater sample by using a purging and trapping sample injector, trapping the phenol by using a trapping trap, and then analyzing the phenol to enter a gas chromatograph-mass spectrometer; and (3) carrying out qualitative and quantitative analysis on the phenol trapped by the trapping trap by using a gas chromatograph-mass spectrometer. Compared with the prior art, the method for measuring the phenol content in the industrial wastewater is simple, rapid, efficient and accurate, the wastewater with complex components and high organic matter concentration can be directly purged, the pretreatment processes such as separation and purification are omitted, an organic solvent is not needed for extraction, the detection cost is reduced, and the method is suitable for large-scale popularization and application. The time for detecting a group of water samples is shortened from two hours to about 30 minutes, and the detection limit is 0.01-1 mg/L.

The invention discloses a propacetamol crystal form and a preparation method thereof, and relates to the technical field of chemical organic synthesis. Acetaminophen and chloroacetyl chloride are usedas starting materials, the propacetamol crystal form is prepared through a chloroacetylation reaction and an ammoniation reaction, and the propacetamol crystal form is not reported in the prior art Propacetamol solid is prepared by utilizing the preparation method, and therefore, the feeding amount can be accurately controlled when the propacetamol hydrochloride is prepared through a subsequent salt forming reaction, the situation that the dosage of hydrochloric acid is too large or too small is avoided, and the problem that in the prior art, the yield and purity of the product propacetamol hydrochloride are seriously affected when the propacetamol hydrochloride is prepared through a propacetamol oily matter is solved.

The invention discloses a sampling device for soil detection, and the device comprises a shell support; a servo motor is installed at the top of the shell support, a lifting shell is in threaded connection with the outer side of a spiral shaft, a lifting rotating mechanism is arranged on the inner side of the lifting shell, and a drill bit is connected to the lower portion of the right side of the lifting shell through a bearing; sampling mechanisms capable of sampling soil with different depths at the same time are arranged on the left and right inner sides of the drill bit, and sampling mechanisms capable of taking out all the soil sampled on the inner side of the drill bit are mounted on the left and right outer sides of the drill bit; and a weeding mechanism capable of removing weeds on the surface of the soil sampling area is arranged on the lower portion of the left side of the shell support. According to the invention, the lifting rotating mechanism and the sampling mechanism are arranged, so soil at different depths can be effectively sampled, and the manual labor force is greatly reduced; meanwhile, the whole soil detection sampling efficiency is improved, and the overall practicability and convenience are improved.