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

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 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 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 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 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 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 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 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 an alkyl xanthate propylene ester collector, which uses an alkyl xanthate and a halopropene for liquid-liquid multiphase reaction, and adds two kinds of NF-1 and NF-2 to the method Synthetic auxiliary agent, control the synthesis temperature and time to generate alkyl xanthate propylene. The alkyl xanthate propylene collector prepared by the method of the invention has no irritating odor to the product and production wastewater, the whole production control process is more environmentally friendly, and the product purity and yield are high.

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.