62 results about "Saturated aqueous solution" patented technology

The invention discloses a preparation method of an electromagnetic shielding high-strength supersulfate cement-based material, which comprises the following steps: (1) uniformly mixing a powder material with an electromagnetic wave absorption function with saturated lime water, then adding basalt fibers, reacting under a heat preservation condition, then separating out the basalt fibers, and drying to obtain modified fibers; and (2) carbonizing the coal gangue particles, mixing the carbonized coal gangue particles with a saturated aqueous solution of a magnesium source, and mixing the coal gangue particles with alkali liquor after sufficient absorption. After standing, placing the coal gangue particles in saturated lime water for reaction, and then calcining the coal gangue particles to obtain the modified coal gangue fine aggregate. And (2) taking granulated blast furnace slag powder, coarse aggregate, the modified coal gangue fine aggregate, the modified fiber, paraffin particles and the like as raw materials, and uniformly stirring with water to obtain the super sulfate cement-based material. The process not only solves the problem that the mechanical property of the material is reduced due to the addition of the electromagnetic shielding component, but also reduces the possibility that the cement-based material is detected by infrared.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to an efficient lithium carbonate composite positive electrode lithium supplement agent and a preparation method and application thereof. The composite positive electrode lithium supplementing agent provided by the invention comprises an M-N-C catalyst and lithium carbonate distributed in the M-N-C catalyst, and is prepared by dropping a lithium carbonate supersaturated aqueous solution into an organic solvent containing the M-N-C catalyst through an anti-solvent crystallization method. The composite positive electrode lithium supplementing agent is uniform in particle size distribution, transition metal in the composite positive electrode lithium supplementing agent is embedded into a carbon net of an N-C material through chemical action to form a two-dimensional or three-dimensional conductive network, and a high-activity place is provided for adsorption, desorption and decomposition of lithium carbonate. When being used as a lithium supplement additive in a lithium ion battery, the lithium ion battery electrolyte can greatly shorten the migration path of Li < + > in lithium carbonate and obviously reduce the decomposition potential of lithium carbonate, thereby providing higher charging capacity. In addition, the method provided by the invention has low requirements on production, processing and use environments, and can realize large-scale commercial application.

The invention provides a preparation method for a reverse osmosis membrane resistant to a high-temperature water environment, comprising: synthesizing an α-cyclodextrin@polyethylene glycol supramolecular inclusion complex by a saturated aqueous solution coprecipitation method; preparing an aqueous phase solution containing m-phenylenediamine, D(+) camphorsulfonic acid and triethylamine; preparing an oil phase solution containing trimesoyl chloride; preparing a secondary aqueous solution containing α-cyclodextrin@polyethylene glycol powder and triethylamine; forming an ultrathin polyamide separation layer on a base membrane by interfacial polymerization; and performing secondary interfacial polymerization to form an α-CD@PEG polyester protection layer, and storing a prepared reverse osmosis membrane in ultrapure water.

The application discloses TiO2-Fe2O3 ordered hierarchical structure nanorod arrays, a preparation method and application thereof, and belongs to the field of materials and environmental protection technology. A rutile TiO2 film is mixed with a precursor I, a first-time hydrothermal growth reaction obtains TiO2 primary nanorod arrays, the TiO2 primary nanorod arrays are mixed with a precursor II, a second-time hydrothermal growth reaction is carried out, drying and annealing are carried out, and the TiO2-Fe2O3 ordered hierarchical structure nanorod arrays are obtained. The precursor I is a NaCl saturated aqueous solution of TiCl3. The precursor II is a NaNO3 saturated aqueous solution of FeCl3. The TiO2-Fe2O3 ordered hierarchical structure nanorod arrays have good research potential in the application promotion in the field of actual wastewater advanced treatment and practical application prospects under sunlight.

The invention relates to a bis (2, 2-methylene disulfide) episulfide compound with an ultrahigh refractive index and a preparation method thereof, and belongs to the technical field of optical materials, and the preparation method comprises the following preparation steps: taking chloroacetaldehyde dimethyl acetal, a solvent, disulfur dichloride and an acidifying agent, and carrying out a sulfuration substitution reaction to prepare 2-chloro-1, 2-dithiol; the preparation method comprises the following steps: carrying out nucleophilic substitution reaction on methoxycarbonyl sulfonyl chloride, a low-boiling-point solvent and 2-chloro-1, 2-ethanedithiol, and dropwise adding a bicarbonate saturated aqueous solution to carry out cyclization reaction so as to prepare a methoxycarbonyl disulfide-episulfide compound; and adding dimercaptomercaptan, and reacting to obtain a product. The process route provided by the invention solves the problems of tedious step-by-step reaction, more byproducts and high cost in the prior art.

The invention discloses a water-soluble THCP compound and a preparation method and application thereof, and relates to the technical field of pharmaceutical preparations, the water-soluble THCP compound is composed of THCP, propylene glycol, Tween 80, phosphoglyceride, 95% ethanol, cyclodextrin and distilled water, and during preparation, the propylene glycol, Tween 80, phosphoglyceride and cyclodextrin are stirred for 1-3 hours at 45-65 DEG C at the speed of 450-650 r / min to obtain the water-soluble THCP compound. A mixed solution of propylene glycol-Tween-80-glyceryl phosphate and ethanol is obtained; adding THCP into the obtained propylene glycol-Tween-80-phosphoglyceride-ethanol mixed solution, associating for 1-3 hours at 45-65 DEG C at the speed of 450-650 revolutions per minute, uniformly mixing, and filtering to obtain a THCP association solution; the method comprises the following steps: mixing the THCP association solution with a cyclodextrin saturated aqueous solution, stirring at 45-65 DEG C for 1-3 hours, filtering, and freeze-drying to obtain a water-soluble THCP product, namely the water-soluble THCP compound, the water solubility of the THCP can be remarkably improved, and the prepared water-soluble THCP compound has the effects of relieving anxiety and refreshing.

The invention discloses a method for separating high-purity chlorogenic acid and neochlorogenic acid from a stevia rebaudiana chlorogenic acid product based on membrane coupling extraction crystallization. The method comprises the following steps: preparing a first to-be-treated solution by taking the stevia rebaudiana chlorogenic acid product as a raw material; treating the first to-be-treated liquid through an ultrafiltration membrane and a nanofiltration membrane in sequence to obtain a trapped fluid II, concentrating the trapped fluid II, and adjusting the pH value to obtain a second to-be-treated liquid; extracting the second to-be-treated liquid with an ethyl acetate-n-butyl alcohol saturated aqueous solution to obtain a raffinate phase I and an extract phase I; adjusting the pH of the raffinate phase I to obtain a third to-be-treated solution; extracting the third to-be-treated liquid with an ethyl acetate-n-butyl alcohol saturated aqueous solution to obtain a raffinate phase II and an extract phase II; drying the extract phase I, crystallizing, pulping and purifying to obtain high-purity chlorogenic acid; and drying the extract phase II, crystallizing, pulping and purifying to obtain the high-purity neochlorogenic acid. According to the method, membrane separation, solvent extraction and fractional crystallization are coupled, and high-efficiency and high-selectivity separation and purification of chlorogenic acid and neochlorogenic acid in a stevia rebaudiana chlorogenic acid product are realized.

The application discloses a method for detecting the concentration of dissolved CO in fermentation liquor. The method comprises the following steps: (1) preparing CO saturated aqueous solution, oxygen-free aqueous solution, sodium hydrosulfite solution as a reference solution and deoxygenated myoglobin solution; (2) preparing an absorbance-CO saturation standard curve; (3) sampling and detection: taking a sample from the fermentation liquor as a sample to be detected by a sampling device, injecting the sample to be detected into a cuvette, adding 2.5 mL of deoxygenated myoglobin solution in the cuvette in advance and sealing the cuvette, adjusting zero with the reference solution, detecting the absorbance of the cuvette containing the sample to be detected at a wavelength of 415-425 nm by a spectrophotometer, substituting the obtained absorbance into the absorbance-CO saturation standard curve obtained in step (2) to obtain the corresponding CO saturation, and then converting the CO saturation into the concentration of dissolved CO according to the known CO solubility. The detection method has the characteristics of taking and measuring immediately, rapidness and simplicity.

The application discloses a new method for synthesizing dihydrogibberellin without protecting carboxyl. The application provides a new method for synthesizing dihydrogibberellin without protecting carboxyl, which comprises the following steps: 1) mixing a compound shown in formula II with a catalyst A in an organic solvent B, and carrying out a hydrogen reduction reaction under a hydrogen atmosphere to obtain a compound shown in formula III; 2) mixing the compound shown in formula III with a saturated aqueous solution of a base in an organic solvent C, and carrying out a selective deacetylation reaction to obtain a compound shown in formula IV; and 3) mixing the compound shown in formula IV with triphenyl phosphine and an elimination reagent in an organic solvent D, and carrying out a dehydration elimination reaction to obtain dihydrogibberellin shown in formula V. The application can simplify the synthesis method of dihydrogibberellin and is more beneficial to large-scale production and synthesis.

The invention relates to a production method and device for preparing ammonium / alkali through a microreactor, and belongs to the technical field of safety, environmental protection, energy conservation and water conservation. The method comprises the following steps: simultaneously feeding a saturated aqueous solution of sodium chloride and a sodium bicarbonate solution into a mixing zone for premixing, and feeding into a reaction zone for reaction through shunting to obtain a reaction mixed solution; crystallizing, filtering, washing and drying the reaction mixed solution to obtain sodium bicarbonate; performing crystallization, chemical sublimation, precipitation and recrystallization on the mother liquor obtained by filtering to obtain ammonium chloride, and recovering ammonia gas generated in the crystallization, chemical sublimation, precipitation and recrystallization processes of the mother liquor; calcining the sodium bicarbonate to obtain sodium carbonate, and recovering carbon dioxide released in the calcining process; the recovered ammonia gas, carbon dioxide and water are prepared into a sodium bicarbonate solution to be used as a reaction base solution. According to the invention, liquid-gas reaction is improved into liquid-liquid reaction, and the microreactors connected in series and in parallel are improved, so that the yield and purity of the product are improved.

The invention relates to a synthesis method of oxazole carboxylic acid. The synthesis method comprises the following steps: (1) sequentially adding oxazole, AlCl3 and KI into a reaction kettle, adding a solvent, and uniformly stirring; then adding an auxiliary catalyst, introducing nitrogen to replace air, heating to 140-150 DEG C, introducing CO2, keeping the pressure at 0.4-0.6 MPa, and carrying out heat preservation reaction for 6 hours; and (2) after the reaction is finished, cooling the reaction liquid to room temperature, and filtering. Slowly pouring the filtrate into ice water while stirring, and stirring for 30 minutes to separate out a solid; adding water into a filter cake, dissolving the filter cake in a sodium hydroxide saturated aqueous solution, adjusting the pH value to be 2-3 by concentrated hydrochloric acid, filtering, and drying a solid to obtain oxazole-2-carboxylic acid.

The embodiment of the invention provides a hydrophobic horizontal plate type low-temperature solid adsorption material and a preparation method thereof, and the preparation method comprises the following steps: weighing potassium carbonate with a first preset mass, adding the potassium carbonate into deionized water, and completely dissolving the potassium carbonate to obtain a potassium carbonate saturated aqueous solution; sequentially adding a second preset mass of aggregate carrier, a third preset mass of alkaline aluminum sol and a fourth preset mass of polytetrafluoroethylene pellets into the potassium carbonate saturated aqueous solution to form mud with fluidity; the pug is evenly laid on the surface of a metal net, pressing is conducted under preset pressure, and a flat plate blank is formed; the mass of the flat plate blank is constant through drying; and calcining and curing the flat plate blank with constant mass to obtain the hydrophobic flat plate type low-temperature solid adsorption material. The device has high CO2 adsorption capacity, excellent hydrophobicity and mechanical stability, the low-temperature applicability of the device remarkably reduces industrial carbon capture energy consumption, and a flat plate type design is adapted to a modular device.

The processing technology comprises the following steps: stirring and mixing beta-cyclodextrin and purified water in a stirring tank according to a ratio of 1: 1.25 to prepare a saturated aqueous solution, mixing azithromycin and absolute ethyl alcohol according to a ratio of 1: 1.5 to completely dissolve the azithromycin, and granulating the azithromycin and the absolute ethyl alcohol to prepare the azithromycin dry suspension. The preparation method comprises the following steps: adding dissolved azithromycin into a beta-cyclodextrin saturated water solution, uniformly mixing through a wet mixing granulator to prepare a suitable soft material, carrying out boiling drying, granulating, totally mixing, carrying out inner packaging and outer packaging by using a composite film, and finally warehousing. According to the characteristic that the effective components are bitter in taste, the beta-cyclodextrin has a unique annular structure, the interior of a molecular cavity of the beta-cyclodextrin is hydrophobic, the exterior of the beta-cyclodextrin is hydrophilic, various guest molecules can be included in the cavity through intermolecular acting force to form an inclusion compound, the bitter effective components are included in a framework of the beta-cyclodextrin, and the taste is improved.

The invention discloses a method for detecting aflatoxin in silkworm chrysalis meal. According to the invention, a salting-out auxiliary liquid-liquid extraction technology and a supramolecular solvent extraction technology are integrated and are executed by an automatic salting-out extraction device specially designed for a pretreatment process, so that a system and a scheme for detecting aflatoxin in silkworm chrysalis meal, which integrate a special device, a core reagent and a detection method, are provided; a detection method which is green, environment-friendly, rapid, efficient, low in cost, high in sensitivity and good in accuracy is established. The preparation method comprises the following specific steps: preparing a supermolecular solvent consisting of n-heptanol, tetrahydrofuran and water and a saturated aqueous solution; the method comprises the following steps: mixing a silkworm chrysalis meal sample with a supramolecular solvent and ammonium sulfate, and carrying out vortex, centrifugation, constant volume and filtration to obtain a test solution; and carrying out quantitative analysis by adopting a matrix matching standard curve. The method is simple and convenient to operate, low in organic solvent consumption and low in cost, and is suitable for high-throughput rapid screening and quantitative detection of trace aflatoxin in silkworm chrysalis meal.

The present invention belongs to the field of preparation methods of aliphatic disulfides, and particularly relates to a method for catalytic synthesis of symmetrical dialkyl disulfides, which is implemented according to the following steps: (1) Place a magnetic stirrer bar, measured thiol, sulfur, and an organic superbase catalyst into a reaction flask; (2) Place the reaction flask in an oil bath of a magnetic heating stirrer, install a condenser, and connect the condenser to a drainage bottle through a silicone rubber tube. A saturated aqueous solution of H<subgt;2< / subgt;S is pre-added to the drainage bottle; (3) Start heating and begin stirring the reaction, start timing, and determine the amount of H<subgt;2< / subgt;S released and the reaction termination time by the drainage method to obtain the target product. The reaction conditions of the present invention are mild, the reaction rate is fast, the atomic utilization rate and the yield are high, and the by-product H<subgt;2< / subgt;S gas is easily separated and utilized.

The invention discloses a preparation method of an L-isoleucine spherical crystal, which comprises the following steps: adding an additive into an L-isoleucine saturated aqueous solution, keeping the temperature at 75-80 DEG C for 30-60 minutes, and then carrying out reduced pressure evaporative crystallization to obtain the L-isoleucine spherical crystal, the additive comprises any one or a combination of at least two of L-amino acid, substituted or unsubstituted C1-C3 alkyl cellulose and substituted or unsubstituted C1-C3 alkyl cellulose salt; the substituted substituent is hydroxyl and / or carboxyl. According to the preparation method, the L-isoleucine spherical crystal is prepared through cooperation of an additive and reduced pressure evaporation crystallization, and the spherical crystal product is good in sphericity degree, uniform in particle, good in fluidity and high in tap density; the preparation method is simple and easy to control, high in yield, green and environment-friendly, and convenient for industrial large-scale production and application.

The invention discloses a method for simultaneously preparing high-content isochlorogenic acid A and high-content isochlorogenic acid C. The method comprises the following steps: dissolving a stevia rebaudiana polyphenol product in purified water, and adjusting the pH value to obtain a treating fluid 1; adsorbing the treating fluid 1 through macroporous adsorption resin, jacking the treating fluid 1 through purified water, and mixing effluent liquid during adsorption and purified water jacking to obtain effluent liquid 1; concentrating the effluent 1 by using a reverse osmosis membrane, adjusting the pH value to obtain a treating fluid 2, and extracting the treating fluid 2 by using an ethyl acetate saturated aqueous solution to obtain a raffinate phase I and an extract phase I; adjusting the pH value of the raffinate phase I, and extracting with an ethyl acetate-n-butyl alcohol saturated aqueous solution to obtain a raffinate phase II and an extract phase II; after drying the extract phase I, sequentially crystallizing and recrystallizing to obtain high-purity isochlorogenic acid C; and drying the extract phase II, and sequentially crystallizing, pulping and purifying to obtain the high-purity isochlorogenic acid A. The method comprises the following steps: removing impurities by adopting macroporous adsorption resin, extracting by adopting a solvent step by step, carrying out crude separation on the isochlorogenic acid A and the isochlorogenic acid C, and carrying out subsequent crystallization and refining to obtain the high-content isochlorogenic acid A and the high-content isochlorogenic acid C.

The invention relates to a preparation method of bis (4-tert-butylphenyl) iodine hexafluorophosphate, and belongs to the technical field of photoinitiators. According to the method, reaction conditions are optimized according to the reaction principle of free radical chain initiation and chain growth, in the step (1), by adjusting the adding mode of an oxidizing agent, the oxidizing agent accounting for 38.46%-45.45% of the molar mass of the whole oxidizing agent is added into a container and stirred to be uniform, the reaction is carried out for 40 min or above, then the remaining oxidizing agent is prepared into a saturated aqueous solution to be added, and the reaction is carried out for 30 min or above; the reaction lasts for 2-3 days, the reaction efficiency of free radicals in the reaction is greatly increased, the reaction yield can be increased to 90% or above, and the requirement of large-batch production can be met.

This invention provides a macrocyclic crosslinked anion exchange membrane constructed using host-guest recognition, its preparation method, and its application. First, a large-volume rigid crosslinking agent, CDIC, is synthesized by using a saturated aqueous solution method to include nonpolar molecules via the host-guest molecular recognition of β-cyclodextrin. Second, a membrane-forming material is prepared by first chloromethylating the polymer and then functionalizing it. Finally, CDIC is introduced into the membrane-forming material to promote the formation of microphase separation structures within the membrane, resulting in a macrocyclic crosslinked anion exchange membrane. The anion exchange membrane synthesized by this invention can be applied in the field of electrodialysis water treatment. The preparation process is simple, the raw materials are inexpensive and readily available, and the resulting anion exchange membrane exhibits suitable water absorption and optimal microphase separation structures at a relatively low charged group density, thereby effectively improving the selectivity and ion transport flux of the anion exchange membrane and providing a new preparation strategy for electrodialysis water treatment devices.

A system for detecting gas leaks, comprising a chemical reagent that includes a saturated aqueous solution of a predetermined metal ionic powder; a flexible substrate configured to receive the chemical reagent, wherein the flexible is also configured to be affixed to the exterior of an item to be leak tested; a source of ozone gas, wherein the ozone gas is flowed into the item to be leak tested under a predetermined pressure for a predetermined period of time, wherein a color change is visible on the substrate at a specific location or locations on the item where the ozone gas has exited the item and reacted with the reagent on the flexible substrate.

Slurries and methods of making slurries for modifying and extending relative humidity control ranges. The slurries may include a saturated aqueous salt and one or more other reagents selected to provide a controlled modifiable narrow range of relative humidity. The saturated aqueous salt may be one or more of sodium chloride, potassium chloride, potassium citrate, sodium formate, and / or magnesium chloride, and the one or more other reagents may be one or more of a lactate salt, glycerol, and / or an acetate salt, for example.

Provided is a potassium nitrate production method that makes it possible to effectively utilize waste which has been discharged from a cement plant, so as to obtain potassium nitrate easily and highly efficiently, said method comprising: a step for extracting potassium chloride from chlorine bypass dust discharged from the cement plant by bringing the chlorine bypass dust into contact with a saturated aqueous solution of potassium chloride at room temperature; a step for bringing the potassium chloride obtained in the step for extracting the potassium chloride into contact with nitric acid obtained from nitrogen oxides contained in combustion exhaust gas discharged from the cement plant; and a step for obtaining potassium nitrate by heating, at 75-175°C, a fluid obtained in the contacting step. Also provided is a system for treating waste which has been discharged from the cement plant.

The invention discloses a ferrate composite coagulant and a preparation method thereof, and the ferrate composite coagulant comprises the following components in percentage by mass: 5%-70% of ferrate, 5%-30% of ferric trichloride, 2%-20% of periodate, 5%-40% of beta-cyclodextrin and 1%-10% of alkaline auxiliary materials. The preparation method comprises the following steps: adding beta-cyclodextrin into a KOH solution, heating, adding ferrate, and carrying out primary inclusion to obtain an intermediate product; adding ferric trichloride, periodate and auxiliary materials into the intermediate product, and then adding into a heated saturated aqueous solution of beta-cyclodextrin for secondary inclusion. Periodate is adopted as a stabilizer, so that the ion concentration of decomposition reaction products such as K < + > can be increased, the decomposition reaction of ferrate is inhibited, and the stability of the solution is improved. The composite coagulant can be stably stored at normal temperature, is slowly and stably released in an aqueous solution, can keep high strength for a long time, and has good flocculation performance in water treatment.

The invention relates to the field of pharmaceutical chemicals, and particularly discloses a method for purifying cycloheptanone. The method for purifying the cycloheptanone comprises the following steps: step 1, preparing a low-carbon alcohol solution of crude cycloheptanone oil, namely a solution I; step 2, preparing a sodium hydrogen sulfite saturated aqueous solution, namely a solution II; step 3, dropwise adding the solution II into the solution I, separating out a white solid, reacting for 5-12 hours, cooling to 0-5 DEG C, keeping the temperature for 1-3 hours, and filtering to obtain an intermediate sodium sulfonate crude product; 4, recrystallizing the sodium sulfonate crude product to obtain a sodium sulfonate refined product; and step 5, reacting the sodium sulfonate fine product with dilute acid to obtain the cycloheptanone. The defects that a traditional purification process is low in efficiency, the production cost of the cycloheptanone is too high, and the quality and purity of the cycloheptanone cannot meet the requirement are overcome.

The present invention discloses a permeable concrete that can efficiently and sustainably purify runoff pollution and a preparation method thereof. The method comprises the following steps: first, using a saturated aqueous solution of calcium hydroxide as a solvent, ultrasonically dispersing water-soluble carbon nitride and hydroxylated boron nitride aerogel and stirring them magnetically to form a dispersion; then, immersing aggregate in the dispersion and drying the dispersion to obtain aggregate loaded with carbon nitride composite boron nitride aerogel; then, mixing a polycarboxylate water-reducing agent and a retarder dissolved in the dispersion with the aggregate loaded with carbon nitride composite boron nitride aerogel; and adding a cementitious material to mix the mixture; finally, spraying the dispersion again on the surface of the formed concrete, thereby combining the dispersion with the concrete through internal mixing and spraying; and obtaining the permeable concrete that can sustainably purify runoff pollution after carbonization curing. The permeable concrete obtained by the present invention has the effect of efficiently and sustainably purifying runoff pollution and has certain social benefits.

The present invention relates to the field of ion conductor technology, and more particularly to a solid-state ion conductor material and a method for preparing the same. A method for preparing a solid-state ion conductor material comprises doping a two-dimensional layered structure material with a certain proportion of atoms as a raw material, self-assembling the doped two-dimensional layered structure material to obtain a self-assembled two-dimensional material; immersing the self-assembled two-dimensional material in a saturated aqueous solution of conductive ions to transport the conductive ions between the layers of the self-assembled two-dimensional material to form a dense stack of interlayer ions, thereby obtaining the desired solid-state ion conductor material; the doped atoms are non-metallic atoms; and the conductive ions are metal ions. This method for preparing a solid-state ion conductor material can produce a solid-state ion conductor material with high ionic conductivity.

The present invention relates to the technical field of tail gas treatment equipment, and discloses a tail gas recovery and treatment equipment, a treatment method and an application in methylamine preparation. It includes a first storage area and a second storage area. The second storage area is arranged inside the first storage area. A treatment area is provided inside the second storage area. A spraying assembly and a sputtering assembly for rotation are provided inside the treatment area. A concentration sensor is provided on the right side wall of the treatment area. The spraying assembly includes a first water storage device. Through the mutual cooperation of the vibration assembly and the extrusion block, the water spraying assembly can perform intermittent water spraying, causing the water baffle to vibrate, and vibrating and separating the water stains attached to the surface of the water baffle, avoiding the inability to absorb methylamine due to saturated aqueous solution. By providing the water spraying assembly and the sputtering assembly, the first water storage device can drive the stirring plate to rotate, causing the tail gas inside the treatment area to rotate, and cooperating with the sprayed aqueous solution to enable the tail gas to fully contact the aqueous solution.

The application discloses a motor lubricating grease composition, which comprises a thickening agent, base oil and an additive, and specifically, the thickening agent is 10-15%, the base oil is 85-90%, and the sum of the mass percentages of the two is 100%; the additive is additionally added in a proportion of 1-5%; the thickening agent is composed of mixture A and mixture B; a) the mixture A is a reactant of dodecahydroxy stearic acid, organic dibasic acid and saturated aqueous solution of lithium hydroxide monohydrate, and the molar ratio of the dodecahydroxy stearic acid to the organic dibasic acid is 1:0.1-1; b) the mixture B is an amide compound, and the amide compound is a mixture of one or more of dodecanamide, hexadecanamide, octadecanamide, octadecenoic acid amide, docosanamide, docosenoic acid amide, N,N-dimethyl dodecanamide and N,N'-ethylene bis-stearamide in an arbitrary ratio. The application can effectively prolong the service life of the lubricating grease, prolong the grease replenishing period and prolong the service life of the motor.

A process for removing biuret for solid urea (UR), wherein the solid urea is in a granular or powder form, the process including leaching the solid urea with a leaching solution (LS) which is a urea saturated aqueous solution, wherein biuret contained in the solid urea is transferred to said leaching solution during the leaching process, obtaining a purified solid urea.

The application provides a chromone-modified o-phenanthroline polypyridine Ru(II) series compound and a preparation method and application thereof, the preparation method synthesizes an intermediate A by taking 1,10-o-phenanthroline-5,6-diketone and 6-substituted-4-oxo-4H-benzopyran-3-formaldehyde as raw materials, then the intermediate A is heated to reflux in ethylene glycol solvent and cis-[Ru(2,2'-dipyridine)2Cl2]·2H2O at 120 DEG C for 6h, after the system is cooled to room temperature, an excess amount of a saturated aqueous solution of potassium hexafluorophosphate is added, after a precipitate is separated out, the filter cake is washed with clean water, and the final product is obtained after drying. The synthesis method is simple and easy to operate without steps such as column chromatography.