125 results about "Hexane" patented technology

The present application belongs to the field of food oil, and particularly relates to a method for processing olive oil, especially virgin olive oil. The method comprises the following steps: cleaning, drying and crushing olive pomace after oil extraction by using an organic solvent (n-hexane or ethanol), adding a certain amount of olive pomace powder into olive oil and stirring under vacuum, then removing the precipitate, and finally processing under ultrahigh pressure. The content of ethyl ester of fatty acid in the virgin olive oil processed by the method of the present application can be kept less than or equal to 35 mg / kg under the condition of 30 DEG C and packaging in the dark for 12-24 months.

This invention belongs to the field of lithium-ion battery flame retardant technology, specifically relating to a flame-retardant electrolyte, its preparation method, and its application. The electrolyte comprises: lithium salt, carbonate organic solvent, co-solvent, and flame-retardant additive; the concentration of lithium salt in the electrolyte composed of lithium salt and carbonate organic solvent is 0.5–5 mol / L; the volume ratio of carbonate electrolyte to flame-retardant additive is 100:(1–30); the volume ratio of co-solvent to flame-retardant additive is (4–120):(1–5); the co-solvent is a solvent capable of dissolving the flame-retardant additive, and the flame-retardant additive is a perfluorohexane derivative. This invention proposes introducing a co-solvent that does not interact with lithium ions into the electrolyte. Through the bridging effect of the co-solvent, the insoluble flame retardant is introduced into the conventional electrolyte. The flame-retardant electrolyte prepared by this method does not deteriorate its electrochemical performance due to the addition of the flame retardant, thus solving the problem of incompatibility between the flame-retardant performance and electrochemical performance of lithium-ion battery electrolytes.

The application relates to the technical field of fluorine-containing iodoalkane preparation, in particular to a preparation method of high-carbon-number diiodoperfluoroalkane, which comprises the following steps: reacting tetrafluoroethylene and elemental iodine to generate diiodotetrafluoroethane; and under the action of a catalyst, the diiodotetrafluoroethane is subjected to telomerization reaction with tetrafluoroethylene to generate high-carbon-number diiodoperfluorobutane and diiodoperfluorohexane; and the catalyst is a metal nickel catalyst supported on silicon dioxide. The metal nickel catalyst supported on silicon dioxide is used to make the diiodotetrafluoroethane and the tetrafluoroethylene subjected to telomerization reaction to obtain diiodoperfluoroalkane with higher carbon number. The application has the advantages of simple process, low reaction temperature and the like, and can significantly improve the yield of diiodoperfluorobutane and diiodoperfluorohexane.

This invention discloses a method for the efficient conversion of isoparaffins, comprising the following steps: contacting a raw material containing isoparaffins and hydrogen with a catalyst in a reactor, reacting to obtain a product containing small molecule alkanes; wherein the isoparaffins are selected from at least one of isobutane, isopentane, neopentane, isohexane, and 3-methylpentane; wherein the small molecule alkanes are selected from at least one of ethane, propane, and n-butane; the catalyst is obtained by the following steps: mixing a metal acidic functional component, a metal basic functional component, a matrix precursor, a phosphorus auxiliary component precursor, a molding aid, and water, kneading, molding, and vacuum drying to obtain the catalyst.

This invention proposes a purification method for ascomycin and its application. The method includes acidifying and filtering the ascomycin fermentation broth to obtain a bacterial residue; adding organic solvent I to the bacterial residue for extraction to obtain an extract filtrate; sequentially adding a salt solution, an alkaline solution, and an acid solution to the extract filtrate for treatment, and decolorizing the product to obtain a decolorized organic phase; evaporating the decolorized organic phase under reduced pressure, and sequentially treating it with ethyl acetate and n-hexane, followed by cooling and filtration to obtain wet crystals 1, which are then washed with n-hexane to obtain wet crystals 2; drying the wet crystals 2 sequentially, dissolving them in organic solvent II to obtain a pre-crystallization liquid, crystallizing by low-temperature stirring, filtering, and then vacuum drying the solid phase. This method can obtain ascomycin with high purity (not less than 99.2%), a yield higher than 61%, and is simple to operate, easy to scale up for industrial production, and has low production costs, making it highly valuable for application.

The application discloses a kind of oil-containing water body separation membrane for refining process of Bupleurum volatile oil and preparation method and application.The preparation method of the application is first mixed and dissolved according to proportion with cellulose acetate and cellulose nitrate powder, form casting membrane liquid, and the base membrane is prepared using non-solvent phase conversion method;Second, the film is deacetylated;After that, it is soaked in acyl chloride n-hexane solution for crosslinking;Finally, by in-situ hydrolysis of silane coupling agent on the membrane surface, a hydrophobic surface is prepared, and an oil-containing water body separation membrane for refining process of Bupleurum volatile oil is obtained.This method forms a hydrophobic layer on the surface of the membrane, which strengthens the rapid passage of Bupleurum volatile oil molecules and inhibits the penetration of water;Using the oil-containing water body separation membrane avoids the formation of emulsion during oil-water separation, showing high separation efficiency and stability, and widening the application of cellulose acetate membrane in traditional Chinese medicine preparation process.

This invention discloses a method for preparing 4-(trifluoromethylsulfinyl)pyrazole compounds, comprising: dissolving terminal alkyne in n-hexane under nitrogen atmosphere, adding anhydrous zinc chloride, and reacting trifluoromethylsulfinyl chloride to obtain α-trifluoromethylalkynyl sulfoxide; adding benzoyl chloride dropwise to a CH2Cl2 solution of phenylhydrazine and triethylamine under nitrogen atmosphere to obtain acylhydrazine; adding carbon tetrachloride to a suspension of acylhydrazine and triphenylphosphine in acetonitrile to obtain hydrazone chloride; and reacting α-trifluoromethylalkynyl sulfoxide, hydrazone chloride, potassium carbonate, and anhydrous ethanol at room temperature to obtain 4-(trifluoromethylsulfinyl)pyrazole compounds. This invention uses inexpensive and readily available raw materials, the entire reaction route is mild and simple to operate, does not require stringent reaction conditions, and most of the reaction process is carried out at room temperature. The product yield is high, and the prepared trifluoromethylalkynyl sulfoxide pyrazole structure has multiple derivatization sites, showing good application prospects.

The present invention provides novel water-soluble compositions comprising sesquiterpene coumarin enriched fractions containing different ratios of sesquiterpene coumarin derived from Ferula species for the treatment of Parkinson's disease via inhibition of MAOenzyme (MAO-A and MAO-B). The invention also provides a method of preparation of ethyl-acetate extract and sesquiterpene coumarin enriched fractions from asafoetida (Hing) that is oleo-gum-resin of Ferula assafoetida using silica gel column chromatography wherein the mobile phase consists of differing compositions of hexane, toluene, chloroform,ethyl-acetate, and methanol. The invention provides the method to prepare the formulation using a multistep process comprising of preparing sesquiterpene coumarin enriched fraction followed by preparing water-soluble formulation. The final composition improves the water solubility, imparts long-term stability, exerts MAO inhibitory activity, and improves pharmaceutical compliance.

The application belongs to the technical field of detection and analysis, and discloses a normal phase detection method for imine reaction control. The method is detected by normal phase liquid chromatography, and the detection conditions include: a polysaccharide derivative normal phase coated type chiral chromatographic column is used, and a mixed solution of n-hexane, ethanol, ethylenediamine and trifluoroacetic acid is used as the mobile phase, wherein the volume ratio of n-hexane, ethanol, ethylenediamine and trifluoroacetic acid is (75-85):(15-25):(0.05-0.15):(0.05-0.15). The method can realize effective separation, detect the content of 1,2,3,4,10,14B-hexahydrodibenzo[C,F]pyrazino[1,2-A]azepine in the reaction solution, and has the advantages of simplicity, accuracy, rapidness and reliability.

This invention discloses a non-close-packed rainbow superlattice two-dimensional thin film, its preparation method, and its applications, belonging to the field of metal nanomaterials technology. First, noble metal nanoparticles are modified with polystyrene-thiol as the modifier. Then, through the solvent effect, the hydrophobic interaction between the modified polystyrene-thiol and the block copolymer polystyrene-polyacrylic acid ligand is enhanced, causing the discrete noble metal nanoparticles to assemble into clusters. The clusters are dispersed in water, and a perfluorodecylthiol anhydrous ethanol / n-hexane solution is added, resulting in a non-close-packed rainbow superlattice two-dimensional thin film at the liquid-liquid interface. This invention achieves the control of the optical properties of the superlattice two-dimensional thin film, exhibiting strong versatility and applicability to noble metal nanoparticles with various morphologies. The prepared non-close-packed rainbow superlattice two-dimensional thin film possesses rich and tunable colors, showing promising application prospects in display, sensing, and anti-counterfeiting fields.

This invention provides a method for simultaneously detecting 17 heat-processing hazards in 4 categories, comprising: adding n-hexane to the sample, mixing thoroughly, discarding the n-hexane phase, extracting acrylamide, 5-hydroxymethylfurfural, and free heterocyclic amines using dimethyl ketone and ultrasound-assisted extraction, collecting the supernatant, and purifying it; simultaneously transferring the precipitate to another tube, reducing it with sodium tetrahydroborate, hydrolyzing it with hydrochloric acid to release bound heterocyclic amines and late-stage glycosylation products, and performing UPLC-MS / MS analysis. This invention is the first to propose a two-step extraction method for simultaneously determining 17 heat-processing hazards in 4 categories within 7 minutes using UPLC-MS / MS. The accuracy, precision, detection limit, quantitation limit, and recovery rate of the method were verified, and all test indicators met the requirements. This method is applicable to the determination of heat-processing hazards in four types of food matrices: high starch, high protein, high fat, and high sugar.

The application discloses a lithium salt particle size measuring method, and belongs to the technical field of material measurement. The measuring method comprises the following steps: step S1: obtaining a lithium salt powder to be measured; step S2: under the condition that the dew point temperature of a measuring environment is less than or equal to-45 DEG C, dispersing the lithium salt powder in a dispersion medium to form a lithium salt suspension; measuring the particle size of the lithium salt in the lithium salt suspension by using a particle size measuring device to obtain the particle size of the lithium salt powder; wherein the dispersion medium is selected from at least one of n-heptane, n-dodecane, n-undecane, n-decane, n-hexane, toluene, xylene, anisole and butyl butyrate. The lithium salt particle size measuring method is particularly suitable for the particle size measurement of hygroscopic / dissolvable samples, has high measurement precision and good repeatability, and the relative standard deviation (RSD) is less than 2%.

The application belongs to the field of hydrometallurgy, and an embodiment provides a method for selectively extracting uranium from a high-concentration sulfuric acid medium. The method comprises the following steps: providing an extraction organic phase, wherein the extraction organic phase comprises a compound and a diluent; mixing and extracting the extraction organic phase and a solution, wherein the solution comprises uranium and acid, and the sulfuric acid concentration of the solution is at least 1 g / L, wherein the compound has a structure shown in formula I; formula I, R1, R2 and R3 are independently selected from any one of C3-C18 linear, branched or cyclic aliphatic hydrocarbon groups and C6-C18 aromatic groups; and the diluent comprises at least one of sulfonated kerosene, aviation kerosene, n-hexane and cyclohexane. The method of the embodiment of the application is simple and easy to implement, and can efficiently separate uranium from coexisting impurity metal ions.

The application discloses a preparation method of an underwater bubble micro-reactor with a fixed-point reaction capability, and belongs to the field of underwater gas micro-reaction controller preparation methods. First, a laser marking machine is used to etch a hollow pattern on a pure zinc sheet as a mask, and the mask obtained through laser etching is attached to a substrate by double-sided adhesive tape. Then, polydimethylsiloxane, a curing agent and hydrophobic silicon dioxide are added to n-hexane and uniformly mixed to obtain a spraying liquid. The spraying liquid is sprayed onto the substrate covered with the mask. The sprayed substrate is placed in an oven for curing. After curing, the mask is removed, and an underwater bubble micro-reactor containing a gas-permeable pattern is obtained. The underwater bubble micro-reactor can achieve good control over underwater micro-reactions. The bubbles act as a protective "shell" to prevent the internal detection liquid drops from being polluted and evaporated. The laser etching and simple spraying technology can be combined to realize large-scale preparation and popularization.

This utility model relates to the field of hexane tail gas treatment technology, and discloses an integrated treatment device for the condensation, absorption, and reuse of hexane tail gas. The device includes a water tank, a base, and a top cover. A separation tower is fixedly connected to the middle of the upper surface of the base. A first servo motor is fixedly connected to the inner bottom surface of the middle of the upper end of the base. The output end of the first servo motor penetrates through the separation tower to the interior of the lower end of the separation tower and is fixedly connected to a stirring rod. Multiple stirring blades are fixedly connected to the outer wall of the upper end of the stirring rod. In this utility model, the stirring rod is driven by the first servo motor, allowing the stirring blades to directly act on the mixture of absorbent and hexane tail gas inside the separation tower, increasing the contact area and promoting absorption. Simultaneously, a second servo motor drives fan blades to generate airflow, which, combined with the heating effect of the heating rod, effectively controls the gas temperature and flow inside the tower, further promoting the absorption process and ensuring heating uniformity.

The application discloses a detection method for separating diglyceride in vegetable oil and qualitative analysis of the diglyceride, and the diglyceride in the vegetable oil is dissolved by using n-hexane to obtain a sample for standby; different proportion eluent is used to wash and elute a solid phase extraction column, and eluent is collected and dried for standby to obtain eluate; the eluate is analyzed and quantified by using a thin layer chromatography and gas chromatography, and finally, the eluate is finely qualitatively analyzed by using a triple quadrupole; the separation method is simple, the separation of the diglyceride in the vegetable oil can be realized by using two extraction cartridges, the test steps are simplified, the separation purity is high, the cost and time are reduced; finally, qualitative analysis is performed by using GC-MS, the analysis time is short, the specific fatty acid composition in the diglyceride is more finely analyzed, and the qualitative analysis detection of food nutrition and the guidance of related food production are facilitated.

The present application relates to the technical field of organic chemical industry, and particularly relates to a preparation method of a low-temperature and high-efficiency adsorbent for removing olefins from hexane. The method comprises the following steps: 1. hydrogen type molecular sieve preparation: sodium type molecular sieve is exchanged by exchange liquid, washed by desalted water, repeated three times of exchange-washing, dried and calcined to obtain hydrogen type molecular sieve; 2. forming: hydrogen type molecular sieve, pseudo-boehmite and nitric acid aqueous solution are mixed according to a proportion, and a strip-shaped molecular sieve is prepared by kneading, rolling, extruding, drying and calcining; 3. modification: the strip-shaped molecular sieve is exchanged by exchange liquid, washed by desalted water, dried and calcined to prepare a molecular sieve adsorbent. The present application realizes removal of C6-C9 olefins in the recycled hexane for producing ethylene-propylene rubber, reduces the bromine value of the hexane, realizes continuous hexane refining, and improves the quality of the ethylene-propylene rubber product.

This invention belongs to the field of polymer materials technology, specifically relating to a production process for ultra-high molecular weight polyethylene (UHMWPE). By optimizing the catalyst system and polymerization process, this invention improves the performance and production stability of UHMWPE. A co-catalyst composed of alkylaluminum and organosiloxane modifiers, acting synergistically with external electron donors, significantly enhances catalyst activity and stereoselectivity, resulting in a more stable polymerization process, higher molecular weight and narrower molecular weight distribution, and significantly enhanced mechanical properties. The multi-stage polymerization process achieves precise control of the polymerization process through segmented temperature control, coupled with a dual-circulation heat removal system to effectively remove reaction heat, avoid localized overheating, and ensure a uniform and stable product structure. An integrated solvent recovery and molecular sieve drying system enables efficient recycling of hexane, controlling moisture content to ≤5ppm, preventing catalyst poisoning, ensuring stable continuous production, and overall improving the process's economy and reliability.

The present application provides a kind of production solvent oil hydrogenation process, comprising the following steps: (1) reforming raffinate oil raw material is cut to obtain light component and heavy component;(2) the paraffin-containing raw material and heavy component enter the hydrofining reaction zone, and after the reaction is completed, hydrofining product oil is obtained;(3) hydrofining product oil is treated by stripping to obtain gas phase stream and liquid phase stream;(4) the liquid phase stream enters the de-aromatic reaction zone to carry out hydrodearomatization reaction to obtain a series of solvent oil products.The present application realizes the co-production of different types of high-quality solvent oils such as n-alkane / isomerized alkane solvent oil, pentane blowing agent, food additive n-hexane / industrial n-hexane, vegetable oil extraction solvent and food-grade petroleum ether based on the selection of raw materials and processing path, and the entire production process can be operated stably for a long period.

This utility model discloses a hexane separator with a segmented jacketed heating structure, relating to the field of chemical equipment technology. It includes a tank body with a heating jacket fixedly connected to its exterior. A material inlet is welded to the left side of the tank body, and a segmented heating assembly with a partition plate is installed inside the heating jacket. This hexane separator with a segmented jacketed heating structure, by comprising a tank body, a heating jacket, a material inlet, a steam inlet, a steam outlet, and an annular partition plate, allows high-temperature steam to enter the heating jacket along the steam inlet during operation, heating the tank body and causing rapid evaporation of the liquid material. The annular partition plate divides the interior of the heating jacket into multiple heating zones, allowing for the frequent injection of high-temperature steam at different temperatures. Precise temperature control improves flash evaporation efficiency, achieving segmented heating and precise temperature control, thus solving the problems of incomplete separation and high by-product residue in the equipment.

The present application relates to a kind of n-hexane-methylcyclopentane energy-saving rectification separation system and process, belong to separation process technical field;The separation system includes extractive distillation column and extractive agent regenerator, the bottom of the extractive distillation column is communicated with heat pump reboiler and extractive agent regenerator middle portion by circulating pump respectively;The heat pump reboiler is communicated with the lower part of extractive distillation column by heat exchange reboiler;The bottom of the extractive agent regenerator is connected with heat pump evaporator by the heat exchange reboiler, the heat pump evaporator is communicated with the heat pump reboiler by heat pump compressor, the heat pump reboiler is sequentially connected with supercooling cooler and pressure reducing valve, the pressure reducing valve is communicated with the heat pump evaporator by pipeline.The high-temperature regenerated extractive agent produced by extractive agent regenerating unit is directly used as heat source to provide part of heating for extractive distillation column in the present application, realize the step-by-step utilization of high-temperature extractive agent waste heat, significantly reduce the external heating load of extractive distillation column, reduce system energy consumption.

This invention discloses a SAPO-44 / SAPO-11 composite molecular sieve, its preparation method, and its applications, belonging to the field of molecular sieve technology. The composite material has two phases: SAPO-11 molecular sieve and SAPO-44 molecular sieve, with a morphology exhibiting a structure of interlocking growth of cubic and plate-like crystals aggregated into spherical structures. The preparation method includes adding the obtained SAPO-44 molecular sieve as a seed crystal to a gel used for synthesizing SAPO-11 molecular sieve, and preparing the SAPO-44 / SAPO-11 composite molecular sieve under hydrothermal crystallization conditions. The molecular sieve of this invention is a novel composite molecular sieve with a simple synthesis method. The performance of the composite molecular sieve can be controlled by adjusting the ratio of the two phases through adjusting the mass of the added seed crystal. The composite molecular sieve material prepared by this invention exhibits excellent performance in the n-hexane isomerization reaction.

This invention relates to an azabicyclo[3.1.0]hexane derivative that can be used as a 3C-like protease inhibitor. This azabicyclo[3.1.0]hexane derivative can be used to treat fever, nausea, vomiting, headache, dyspnea, fatigue, respiratory tract infection, olfactory and gustatory disturbances and their complications, or combinations thereof, caused by novel coronavirus infection.

The application belongs to the technical field of high polymer materials, and discloses a method for reducing the content of n-hexane extractive in polyethylene resin. The method increases the frequency of oil and wax discharge in a separation system, reduces the material level, and increases the amount of returned ethylene; the pressure of the low-pressure product separator is reduced, and the temperature is increased; a negative pressure degassing groove is added, and negative pressure air extraction is performed, so that the polyethylene resin of the application is free of low-molecular-weight polyethylene and solvent oil, the content of n-hexane extractive is greatly reduced, the requirement of the drug packaging material is met, and the application can be applied to the fields of medical and health products, personal care products, food packaging and the like.

This invention relates to the fields of environmental and bioanalytical technology, and particularly to a method for simultaneous pretreatment and detection of bisphenol S and bisphenol AF in biological tissues. The technical solution includes a framework process for simultaneous pretreatment and detection of bisphenol S and bisphenol AF in biological tissues. This invention establishes a dual-solvent secondary extraction system composed of n-hexane and methyl tert-butyl ether, achieving differentiated adaptation to different tissue matrices. By combining the advantages of non-polar and moderately polar solvents, it can simultaneously handle the relatively highly polar bisphenol S and the relatively non-polar bisphenol AF in a single extraction process. Furthermore, this method sets key physical parameters during the extraction process according to the histological characteristics of each organ. For heart and lung tissues, specific ultrasonic power is used to ensure thorough cell disruption; while for liver and spleen with high lipid content, different power and time are used to ensure the full release of lipid-bound target substances.

The application discloses a detection method for determining the residual amount of easily hydrolyzed impurities in apremilast, which comprises the following steps: using a high performance liquid chromatograph, adopting polysaccharide derivatives as a filler (CHIRALPAK IH, 4.6mm*150mm, 5um), adopting a n-hexane-tetrahydrofuran (65:35) mobile phase, a flow rate of 1.0ml per minute, a column temperature of 30 DEG C, a detection wavelength of 230nm, and a sample injection volume of 50ul. The application adopts the polysaccharide derivative filler to determine the easily hydrolyzed impurities in the apremilast, has high separation efficiency, strong anti-interference ability, fast analysis speed and high detection sensitivity, and can effectively control the quality of the apremilast by determining the amount of the easily hydrolyzed impurities in the apremilast.

The application provides a liquid chromatography-mass spectrometry method for detecting phytosterol content in dried blood spots, and belongs to the technical field of detection.The application simplifies a sampling process, uses a disposable blood taking needle and a blood taking card for sampling, replaces traditional serum or plasma samples with obtained dried blood spots, punches a sampling area of the dried blood spot sample through a puncher with a diameter of 3.2 mm, takes three dried blood spot samples, extracts seven kinds of sterol substances contained in the dried blood spot samples through n-hexane, adopts liquid chromatography-mass spectrometry, carries out detection and quantification through chromatographic separation and a mass spectrometry detector, realizes rapid and accurate determination of cholesterols, beta-sitosterols, daidzein, campesterol, dihydrocholesterol, dehydrocholesterol and 7-alkenyl cholestanol, and the method is simple in operation, accurate in quantification, and has a recovery rate of 92.4%-96.7%.

The application provides an electrolyte, an electrochemical device containing the electrolyte and an electronic device. The electrolyte comprises ethylene carbonate, propylene carbonate and fluoroethylene carbonate. The mass percentage of ethylene carbonate is a, 1.0% <= a <= 20%, the mass percentage of propylene carbonate is b, 12% <= b <= 35%, based on the mass of the electrolyte. The electrolyte further comprises an additive B. The additive B comprises at least one of butanedinitrile, hexanedinitrile, 1,4-dicyano-2-butene, ethylene glycol dicyan ether, 1,3,6-hexanetrimethylnitrile or 1,2,3-tris(2-cyanooxy)propane. The mass percentage of the additive B is 0.5% to 4%, based on the mass of the electrolyte. The electrochemical device with the electrolyte has good high-temperature storage performance and cycle performance.

The present invention addresses the problem of providing a solid that can be formed into a molded body which has excellent ozone resistance and is unlikely to develop cracks and blisters due to ozone and providing a molded body and a method for producing a solid.　A solid according to the present invention is a powdery or pellet-like solid which contains a copolymer that contains a unit A based on tetrafluoroethylene and a unit B based on a monomer represented by formula (1) (CF2=CF-O-Rf). The total number of functional groups represented by -CF=CF2, -CF2H, -COF, -COOH, -COOCH3, -CONH2, and -CH2OH is less than 150 per 106 main-chain carbon atoms in the copolymer, and the amount of outgas generated when the solid is heated at 300°C for 120 minutes is 100 mass ppb or less relative to the total mass of the solid, in terms of n-hexane.