498 results about "Petroleum ether" patented technology

The invention discloses a high-dosage RAP recycled asphalt mixture and a preparation method thereof, and the method comprises the following steps: step 1, carrying out homogenization treatment on an epoxy resin system and a rubber-asphalt composite system according to a weight ratio of 1: 5-1: 30 to obtain a composite modified asphalt system; 2, preheating the waste asphalt pavement material to 110-130 DEG C, performing dry mixing, adding a petroleum ether regenerant, heating to 150-170 DEG C, and performing dry mixing again to obtain a mixture 1; step 3, preheating new fine aggregate, coarse aggregate and steel slag in batches, adding into the mixture 1, and carrying out dry mixing to obtain a mixture 2 with a primary grading framework; step 4, adding the composite modified asphalt system prepared in the step 1 into the mixture 2, and performing wet mixing to obtain a mixture 3; and step 5, homogenizing the mixture 3 to finally obtain the target recycled asphalt mixture. The invention aims to realize high-mixing-amount recycling of the waste asphalt pavement material.

The invention discloses a cleaning lubricant for textile machinery. The cleaning lubricant comprises the following components in percentage by weight: 6-14% of petroleum ether, 16-26% of solvent oil, 6-14% of alkane oil, 16-26% of 120 # solvent oil, 31-39% of butane gas and 1-9% of dimethyl silicone oil. The invention belongs to the technical field of textile, and particularly relates to a cleaning lubricant for textile machinery, which can clean greasy dirt and dirt on each movable part of a textile mill, a blowing workshop, a drawing workshop, a roving workshop and a spinning workshop. The cleaning lubricant has the technical effects of rust removal, lubrication, rust prevention, wear resistance and non-sticking to all movable parts during cleaning, and the lubricating period of the cleaning lubricant is long.

The invention belongs to the technical field of daily chemical products, and particularly relates to a gardenia extract as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing cape jasmine powder (cape jasmine pollen or cape jasmine fruit powder) with an extraction solvent (water or an alcohol solution), extracting to obtain a water extract or an alcohol extract, and sequentially extracting the alcohol extract by petroleum ether, dichloromethane, ethyl acetate and n-butyl alcohol to obtain the cape jasmine extract. A petroleum ether extract, a dichloromethane extract, an ethyl acetate extract, an n-butyl alcohol extract and a water extract are obtained respectively. The gardenia extract prepared by the invention has obvious anti-oxidation, moisturizing and anti-allergy effects, and a scientific basis is provided for subsequent development of daily chemical products with anti-oxidation, moisturizing and anti-allergy effects by utilizing gardenia.

The invention discloses a preparation method of 4-(acetoxy) phenyl-2-methyl-2-acrylate, which takes mild DMAP as a reaction catalyst, produced phenolic ester is not easy to hydrolyze due to weak alkalinity, and the dripping speed and the reaction temperature are controlled at the same time, so that simultaneous esterification of two hydroxyls of hydroquinone can be effectively avoided, and the yield of 4-(acetoxy) phenyl-2-methyl-2-acrylate is improved. And generation of by-products can be reduced. According to the method, the ethyl acetate and petroleum ether mixed solvent with the ratio of 1: 2 is adopted for recrystallization, hot filtration operation is carried out, insoluble substances are by-products, solids separated out after filtrate is cooled are target products, operation is simple, high-yield target product powder solids can be directly obtained, and the purity can reach 80% or above. The method is simple and rapid in process, short in production period, low in production cost, high in total yield of target products and suitable for industrial production.

The invention discloses a thin-layer chromatography rapid identification method for vigor-preserving decoction particles, and aims to solve the problems of complicated operation, more interference, low efficiency and the like of the existing method. According to the method, a test solution is prepared through methanol extraction and water-saturated n-butyl alcohol and ammonia test solution extraction, reference medicinal materials and seven reference solutions are matched, a petroleum ether-ethyl acetate-methanol-formic acid mixed solution is adopted as a developing solvent, and inspection is conducted after developing is conducted through a silica gel H thin-layer plate. The method can be used for accurately identifying seven key components in the vitality-preserving decoction granules at one time, is high in specificity, simple and convenient to operate, environment-friendly and high in efficiency, and provides rapid and reliable technical support for quality control of the vitality-preserving decoction granules.

The invention provides a preparation method of diphenyl ethyoxyl phosphine and a product thereof. Taking diphenyl phosphonium chloride and absolute ethyl alcohol as raw materials, petroleum ether as a solvent and triethylamine as an acid-binding agent; the reaction process comprises the following steps: reacting diphenyl phosphine chloride with ethanol to generate diphenyl ethyoxyl phosphine and hydrogen chloride, and reacting hydrogen chloride with triethylamine to generate triethylamine hydrochloride. And after the reaction is finished, separating triethylamine hydrochloride separated by crystallization from the liquid organic phase through centrifugation, taking the obtained triethylamine hydrochloride as a co-product, carrying out desolvation treatment on the obtained liquid organic phase to obtain a diphenylethoxyphosphine crude product, and rectifying to obtain the high-quality diphenylethoxyphosphine. The preparation process provided by the invention is mild in reaction condition, simple and convenient to operate and low in requirements on equipment and energy consumption; the raw materials are wide in source and low in cost, and the solvent and the acid-binding agent can be recycled, so that the method has the advantage of environmental protection. The prepared diphenyl ethyoxyl phosphine is high in purity and good in yield, and has a wide industrial application prospect.

The embodiment of the invention relates to the technical field of insulating adhesives, and discloses an insulating sealing coating adhesive which comprises 60-80 parts of a modified styrene-butadiene-styrene block copolymer, 0.3-1 part of a ketimine curing agent, 2-8 parts of an aromatic amine curing agent, 3-8 parts of methyl silicone oil and 12-26 parts of petroleum ether, wherein the modified styrene-butadiene-styrene block copolymer is obtained by epoxidation of a styrene-butadiene-styrene block copolymer (SBS), the molecular weight of the styrene-butadiene-styrene block copolymer is 7000-11000, the substance amount fraction of a PB end (polybutadiene chain segment) is 70-85%, and the ratio of a branched chain structure to a straight chain structure in the PB end is 1: 2-1: 3. The insulation sealing coating adhesive has the characteristics of high reliability and uniform coating in multiple axial directions, especially in the vertical direction (namely the z-axis direction) through the structural characteristics of the insulation sealing coating adhesive and the compounding of the insulation sealing coating adhesive and a multi-element curing agent, is convenient to spray and is beneficial to application to precise components.

The invention provides a botanical fungicide of a chaulmoogra seed extract, which takes sub-chaulmoogra seed oleic acid as a marker, and application of the botanical fungicide in preparation of medicines for preventing and treating plant diseases caused by pathogenic fungi and oomycetes. The hydnocarpus anthelmintica extract is obtained by extracting hydnocarpus anthelmintica seeds with a plurality of different types of organic solvents such as ethanol, petroleum ether and the like and treating the seeds by a physical method, and the hydnocarpus anthelmintica extract contains sub-hydnocarpus anthelmintica oleic acid as markers in different proportions. The extract has the effects of inhibiting conidium germination, bud tube growth or appressorium formation of fungi and oomycetes, effectively preventing pathogenic bacteria from infecting host plants and preventing and treating important plant diseases such as rice blast, mango anthracnose, potato late blight and rice false smut.

The invention relates to the technical field of pharmaceutical analysis, in particular to a thin-layer chromatography identification method of vitality-preserving decoction and a preparation thereof. Comprising the following steps: S1, extracting a sample to be detected by using diethyl ether, and preparing a test solution; s2, preparing a cinnamaldehyde reference substance solution and a 6-gingerol reference substance solution; the method further comprises at least one of the steps S3 and S4; s3, dripping the test solution and the cinnamaldehyde reference solution on the same thin-layer plate, developing with a first developing solvent, and identifying the cinnamon; the first developing solvent comprises petroleum ether and ethyl acetate in a volume ratio of (15-20): 3; s4, dripping the test solution and the 6-gingerol reference substance solution on the same thin-layer plate, developing with a second developing solvent, and identifying the ginger; the second developing solvent is prepared from petroleum ether, trichloromethane and ethyl acetate according to the volume ratio of (2-4): (1-2): (1-3). The method is good in overall separation effect, clear in spots, good in specificity and durability, and capable of identifying the medicine flavors of cinnamon and ginger in the vitality-preserving decoction and the preparation thereof.

The invention relates to the technical field of termite trapping and killing, and particularly discloses an environment-friendly termite trapping and killing strip and a preparation method thereof. The environment-friendly termite trapping and killing strip is prepared from microcrystalline cellulose, sodium carboxymethyl cellulose, potassium sorbate, pine sawdust, tapioca flour, xanthan gum and killing microcapsules. The killing microcapsule comprises a capsule wall and a capsule core, wherein the capsule core is prepared from the following raw materials: triflumuron, diflubenzuron, ammonium chloride, petroleum ether and sodium dodecyl benzene sulfonate; the capsule wall is prepared from the following raw materials: modified chitosan, sodium alginate, modified corn straw powder, Arabic gum and a sugarcane extract. According to the environment-friendly termite trapping and killing strip, all the components are matched, the excellent insecticidal effect is achieved, the pesticide can be slowly released through the killing microcapsules, the insecticidal time is prolonged, and the prepared trapping and killing strip can kill insects for a long time.

The invention belongs to the technical field of biological medicines, and particularly relates to a cordyceps sobolifera fermentation extract for reducing uric acid as well as a preparation method and application of the cordyceps sobolifera fermentation extract. The method comprises the following steps: concentrating cordyceps sobolifera fungus fermentation liquor, then leaching with ethanol, concentrating leaching liquor, then sequentially extracting with n-butyl alcohol, ethyl acetate and petroleum ether, and concentrating extracts to respectively obtain an n-butyl alcohol extraction part, an ethyl acetate extraction part, a petroleum ether extraction part and a residual part, the obtained petroleum ether extract is the cordyceps sobolifera fermentation extract for reducing uric acid. The cordyceps sobolifera fermentation extract disclosed by the invention has the effects of remarkably relieving kidney injury of a mouse with hyperuricemia and reducing serum uric acid of the mouse with hyperuricemia. As a novel natural uric acid-reducing active substance, the cordyceps sobolifera fermentation extract disclosed by the invention can be applied to the fields of health foods and medicines, and has good development and application values.

The present invention discloses a method for extracting effective active ingredients from Buddleja buddhist flower and its application. The method comprises the following steps: first subjecting the crushed Buddleja buddhist flower to ethanol reflux extraction and concentration, and then extracting the obtained Buddleja buddhist flower alcohol extract with petroleum ether, ethyl acetate, and n-butanol respectively. The remaining aqueous phase is concentrated under reduced pressure, purified by a D101 macroporous resin column, and the target product obtained after drying is structurally identified as a verbascoside monomer compound. The method of the present invention can better control the quality standards of Buddleja buddhist flower and pave the way for a more in-depth study of its pharmacological effects by effectively separating the verbascoside compounds from the Buddleja buddhist flower, thereby laying the foundation for the clinical development of new drugs with anti-tumor, antioxidant, and immunomodulatory activities.

The invention relates to the technical field of biological medicines, in particular to a polycyclic polyisopentenyl cyclopentanone compound as well as a preparation method and application thereof. The polycyclic polyisopentenyl cyclopentanone compound provided by the invention has a structural formula as shown in a formula 1; the preparation method comprises the following steps: by taking dry fruits of hypericum berry as raw materials, carrying out percolation extraction and concentration to obtain an extract, suspending the extract in water to obtain a suspension, and extracting and concentrating the suspension with petroleum ether to obtain a crude extract; the crude extract is taken and subjected to positive and negative phase silica gel column separation, MCI medium-pressure column chromatography, Sephadex LH-20 gel column chromatographic separation, high performance liquid chromatography preparation and CHIRALPAK IG chiral column resolution, and the polycyclic polyisopentenyl cyclopentanone compound is obtained. The protection activity of the compound on AC16 myocardial cell injury induced by cold ischemia is evaluated, and the compound can be used for preparing the polycyclic polyisopentenyl cyclopentanone compound. The compounds can be used as lead compounds for developing medicines for preventing and treating myocardial cold ischemia injury.

The utility model provides rapid enrichment equipment for light hydrocarbon oil, medium hydrocarbon oil and crude phenol in medium and low temperature coal tar, which adopts five solvent storage tanks to store and take recovered solvents (acetone, carbon disulfide, petroleum ether, methanol and acetonitrile) in each step so as to be recycled in cycles; carrying out deliming treatment on the medium-low temperature coal tar by using an acetone / carbon disulfide mixed solvent; petroleum ether and methanol, petroleum ether and acetonitrile, and methanol and carbon disulfide are used for carrying out step-by-step double-solvent layered extraction on the de-ashed tar. The device disclosed by the utility model realizes rapid enrichment of target components in medium and low temperature coal tar, provides extract oil which is simple in composition and easy to process for subsequent secondary upgrading, and solves the problems of high energy consumption, difficulty in large-scale commercialization and the like in the prior art.

The invention relates to the technical field of natural medicines, in particular to a 3 / 6 / 5 / 6 / 5 pentacyclic phloroglucinol compound as well as a preparation method and application thereof. The 3 / 6 / 5 / 6 / 5 pentacyclic phloroglucinol compound disclosed by the invention has a structure as shown in a formula I; the method comprises the following steps: extracting hypericum monogynum by using ethanol and petroleum ether, sequentially eluting the obtained petroleum ether extract through silica gel column chromatography, MCI resin column chromatography, Sephadex LH-20 gel column chromatography and ODS medium-pressure column chromatography, and purifying the collected eluate through preparative ODS liquid chromatography and semi-preparative ODS liquid chromatography to obtain the 3 / 6 / 5 / 6 / 5 pentacyclic phloroglucinol compound. The 3 / 6 / 5 / 6 / 5 pentacyclic phloroglucinol compound is extracted from hypericum monogynum for the first time, and the compound has great development value as a novel medicine for preventing or treating calcified aortic valve diseases.

The invention discloses a moss brachycarpus extract with insect antifeedant activity as well as a preparation method and application thereof, and the method comprises the following steps: performing reflux extraction on a fresh material for several times by using ethanol, and combining extract liquids; the preparation method comprises the following steps: extracting the moss, performing rotary evaporation on an extracting solution to obtain extracting paste, dissolving the extracting paste, performing liquid separation extraction by using petroleum ether, ethyl acetate, n-butyl alcohol or water as an extracting solvent, extracting to obtain a moss brachypodium extracting solution, and evaporating to obtain a moss brachypodium extract, namely the moss brachypodium extract with insect antifeedant activity. The invention discloses the preparation method of the moss brachycarpus extract with the insect antifeedant activity and the application of the compound in the insect antifeedant activity for the first time. The insecticide is separated and extracted from plants, has low toxicity, no residue and no pollution to commercial crops such as melons, fruits, vegetables and the like, is more beneficial to environmental protection, and can achieve the effect of preventing insect pests; the moss brachycarpus extract has antifeedant activity, has a remarkable antifeedant effect, and has a good application prospect.

The invention discloses a thin-layer chromatography identification method for cinnamon and ginger in vitality-preserving granules, and belongs to the technical field of pharmaceutical analysis. Aiming at the problems of step-by-step detection, serious cinnamic acid tailing and dependence on toxic solvents in the existing method, the method comprises the following steps: dissolving vitality-preserving particles in water, carrying out ultrasonic treatment, extracting filtrate by using absolute ether, merging extract liquor, evaporating to dryness, and dissolving by adding ethyl acetate to obtain a test solution; preparing a cinnamon reference medicinal material solution and a cinnamic acid and 6-gingerol reference substance solution; a silica gel GF254 thin-layer plate is adopted, petroleum ether-normal hexane-ethyl formate-formic acid is used as a developing solvent for developing, and inspection is conducted under the ultraviolet light of 254 nm and the ultraviolet light of 365 nm respectively. Cinnamon and ginger can be synchronously identified, spots are clear and free of trailing, no toxic solvent exists, durability is high, cost is low, and an accurate and reliable basis can be provided for quality control of the vitality-preserving granules.

The invention discloses a preparation method of an astragalus extract with a uric acid reducing effect, and belongs to the technical field of biological medicines. The method comprises the following steps: concentrating an ethanol extract of radix astragali, extracting by using n-butyl alcohol, ethyl acetate and petroleum ether respectively, and concentrating an extract to obtain n-butyl alcohol, ethyl acetate and petroleum ether extraction parts and residual parts respectively, so as to obtain an n-butyl alcohol extract, namely the radix astragali extract for reducing uric acid. Efficacy experiments show that the normal butanol extraction part of the ethanol extract of the astragalus membranaceus can obviously reduce the serum uric acid level (SUA) of a mouse with hyperuricemia, inhibit the activity of xanthine oxidase (XOD) and effectively improve kidney injury caused by the hyperuricemia. The uric acid reducing effect of the radix astragali n-butyl alcohol extract is close to that of a clinical drug allopurinol, and the radix astragali n-butyl alcohol extract has wide development and application prospects in the aspect of relieving hyperuricemia.

The invention relates to a preparation method of a hydrolysis modified organic silicon high-temperature-resistant anticorrosive coating, and belongs to the technical field of anticorrosive coatings. The preparation method comprises the following steps: heating 1, 1 '-bis (dimethylsilyl) ferrocene, methylbenzene, chloroplatinic acid, 2, 2, 3, 3, 4, 4, 4-heptafluorobutyl acrylate and bis-(2-methylallyl) cyclooctyl-1, 5-diene ruthenium, and reacting to obtain an intermediate product 1; weighing methyltrimethoxysilane, phenyltrimethoxysilane and the intermediate product 1, uniformly stirring and mixing, slowly dropwise adding diluted hydrochloric acid, hydrolyzing, and heating to react, so as to obtain modified silicon resin; adding the modified silicon resin into petroleum ether, and adding silicone oil, an organic tin catalyst, a bis-ammonia coupling agent, filler and a curing agent to obtain the anticorrosive paint.

The invention relates to a continuous production method of ultra-pure 2, 3, 4, 4 '-tetrahydroxybenzophenone, which comprises the following steps: completely dissolving p-hydroxybenzoic acid in high-boiling range petroleum ether, and completely dissolving pyrogallic acid in the high-boiling range petroleum ether; the preparation method comprises the following steps: adding a p-hydroxybenzoic acid solution and a pyrogallic acid solution into an ultra-pure continuous reactor group, adding boron trifluoride diethyl etherate into the ultra-pure continuous reactor group at a flowing speed, reacting at 110-140 DEG C, adding the obtained reaction solution into the next ultra-pure continuous reactor group, stirring in ice water, filtering, washing and recrystallizing to obtain the 2, 3, 4, 5-tetramethyl-3, 5-dihydroxybenzoic acid. According to the present invention, the reaction time is substantially shortened, the conversion rate is 70-80%, the purity of the obtained electronic product is more than or equal to 99.2%, the content of the metal ions such as sodium, aluminum, copper, iron, calcium, zinc and boron is less than or equal to 60 ppb, the reaction materials, the reaction temperature and the reaction rate are controllable, the reaction is sufficient, the yield of the obtained target product is stable, and the method can be used for continuous production.

The application discloses a kind of gardenia and its processed product identification method, comprising: step one, respectively take equal amount of gardenia sample powder, gardenia processed product sample powder;Step two, the above-mentioned powder is respectively soaked with ethanol solution, then ultrasonic extraction is carried out, filtration, filter liquor is evaporated to dryness, obtain gardenia sample crude extract, gardenia processed product sample crude extract;Step three, the above-mentioned crude extract is respectively dissolved with water, then sequentially extracted with petroleum ether, ethyl acetate twice, and the two extraction liquids are combined and evaporated to dryness, obtain extract, the extract is dissolved with methanol, obtain gardenia sample test solution, gardenia processed product sample test solution;Step four, the above-mentioned test solution is respectively spotted on the same silica gel thin layer plate, with developing agent development, dry, with color developing agent color development, and under ultraviolet lamp, view thin layer chromatogram, according to the number, position, color of fluorescence spot on thin layer chromatogram, identify sample variety.

The invention belongs to the field of biological medicine, and particularly relates to an anti-inflammatory and anti-helicobacter pylori compound separated from agilawood and a preparation method thereof. The method comprises the following steps: by taking the agilawood corasta as a raw material, carrying out reflux extraction with ethanol, extracting with petroleum ether to remove volatile components, separating and purifying by adopting various chromatographic technologies such as silica gel column chromatography, reversed-phase column chromatography and semi-preparative HPLC (High Performance Liquid Chromatography) to obtain a monomeric compound, and identifying the structure of the monomeric compound by adopting spectroscopy methods such as ultraviolet, high-resolution mass spectrometry and nuclear magnetic resonance. The structure of a compound 1 is identified as a new 2-(2-phenethyl) chromone dimer, and the compound 1 is named as aquicrasone V. The invention further discloses a preparation method of the compound 1. A biological activity test verifies that the compound has relatively strong anti-inflammatory activity and anti-helicobacter pylori activity.

The invention discloses a method for preparing PDLLA porous microspheres with high porosity and uniform particle size distribution in batches, and belongs to the technical field of polymer biomedical material preparation. According to the method, an ultrasonic-assisted double-emulsification system is combined with an inner water phase (an ammonium bicarbonate solution), an oil phase and an outer water phase (a polyvinyl alcohol solution), and a staged curing process is adopted to realize accurate regulation and control of a pore structure and a particle size. Petroleum ether is introduced as a poor solvent to optimize the precipitation uniformity, ultrasonic and mechanical stirring synergistically improve the emulsification uniformity, and staged curing ensures that the solvent evaporation rate is matched with pore formation. The porosity of the prepared PDLLA microspheres reaches 75%-87%, the SPAN value is as low as 0.512, the pore size distribution is uniform, the process expandability is high, and the method is suitable for the biomedical fields of drug carriers, tissue engineering scaffolds and the like. The technical problems of low porosity, wide particle size distribution and complex process are solved, and the method has a remarkable application prospect.

The present invention discloses a thin layer chromatography identification method for simultaneously identifying multiple components in a refined flat peach pill preparation and its application, which belongs to the technical field of quality control of traditional Chinese medicine. The thin layer chromatography identification method of the present invention is divided into two parts. The first part adopts methanol ultrasonic extraction and is developed by toluene-ethyl acetate-formic acid-methanol system, which can simultaneously identify the alpinia oxyphylla, wolfberry and fenxinmu in the refined flat peach pill; the second part is based on the methanol ultrasonic extraction, and hydrochloric acid is added to heat and reflux extraction, shaken and evaporated, and then ethanol is redissolved and developed by petroleum ether-ethyl acetate system, which can identify the ophiopogon in the refined flat peach pill. That is, only two sample preparation methods are required, and one thin layer plate can simply, quickly and effectively identify the four medicinal materials in the refined flat peach pill, and the color spots are clear, without tailing, without cross-linking and good specificity.

The application discloses a kind of efficient natamycin purification methods, comprising the following steps: taking two kinds of dichloromethane, chloroform, acetone, butanone, methanol, ethanol, petroleum ether, n-hexane are mixed to obtain mixed solution, adjust the pH of mixed solution to 6.0-7.0, then natamycin crude product is added to mixed solution and stirred into slurry;Slurry is extracted to obtain that natamycin wet product, and the natamycin wet product after extraction is washed with organic solvent;Natamycin wet product after washing is dried, and natamycin purification product is obtained.Compared with prior art, the present application optimizes the existing natamycin purification process, simplifies the natamycin purification method, reduces the production cost, improves the production efficiency, the product purity can reach more than 98%, and the product yield can reach more than 95%.The application has the advantages of less equipment investment, easy operation, less environmental pollution, simple operation, and is suitable for product industrial production.

The invention discloses a method for extracting and purifying salidroside from salidroside fermentation liquor, which comprises the following steps: (1) adding tert-butyl alcohol into the salidroside fermentation liquor, filtering, and collecting clear liquid; (2) concentrating the clear solution obtained in the step (1) under reduced pressure to obtain a concentrated solution, adding petroleum ether for extraction, and collecting a water phase; (3) adding ammonium sulfate into the water phase obtained in the step (2), uniformly mixing, adjusting the pH to be acidic, adding ethyl acetate for extraction, and collecting an organic phase; and (4) concentrating the organic phase obtained in the step (3) under reduced pressure, and drying. Through a solvent polarity gradient matching technology and a salting-out enhanced phase separation mechanism, the structural stability of the salidroside is guaranteed, meanwhile, the extraction and purification technological process is simplified, the separation efficiency is remarkably improved, the purity and yield of the salidroside obtained through extraction and purification with the method are both larger than or equal to 90%, and the method is suitable for industrial production. The extraction and purification process provided by the invention is also provided with a solvent recovery system, and the efficiency and economy of industrial production are both considered.

The application provides a regeneration method of halogenated nitrobenzene continuous hydrogenation catalyst, and relates to the technical field of fixed bed halogenated nitrobenzene hydrogenation. The regeneration method mainly comprises the following steps: using alcohol, alkali, petroleum ether and ethyl acetate to preliminarily clean the bed layer, removing azo compounds and other pollutants on the surface of the catalyst by using the special properties of ionic liquids, and then completing the regeneration of the catalyst through the steps of pickling, precious metal solution treatment and drying. The application overcomes the defects of the prior art, has the advantages of simple operation, mild conditions and low cost, realizes the in-situ removal of surface impurities such as reaction intermediates and azo compounds on the catalyst surface without damaging the structure of the catalyst and disassembling the catalyst, further supplements the lost metal active components, and can effectively restore the catalyst activity.

The application discloses a kind of extraction and purification preparation methods of green brick tea polysaccharide, is related to green brick tea polysaccharide extraction process technical field, specific method is: take green brick tea powder, with petroleum ether, anhydrous ethanol / ethanol solution is extracted in turn, and green brick tea coarse powder is obtained;The green brick tea coarse powder is first extracted with water, then is alcohol precipitated with ethanol, and the precipitate is dissolved with water after centrifugation, and green brick tea polysaccharide crude extract is obtained;Polyamide powder is activated, and polyamide equilibrium column is prepared;Green brick tea polysaccharide crude extract is passed through polyamide equilibrium column, and eluate is collected, concentrated, dialyzed with water, and green brick tea polysaccharide finished product is obtained after drying.The extraction and purification preparation method of the green brick tea polysaccharide is simple, reduces cost, uses less chemical reagent using water extraction alcohol precipitation method, and has lower toxicity, and the green brick tea refined polysaccharide prepared by the method has higher purity and better biological activity.

The application discloses a hot air pretreatment method for extracting oat oil and belongs to the technical field of oil extraction. The application solves the technical problems of low extraction efficiency, easy oxidation of oil and large solvent consumption existing in the prior art. The method comprises the following steps: a. oat bran is dried by hot air at 130-150 DEG C for 15-20 min; b. the oat bran is placed in a negative pressure environment, and ethanol vapor flash treatment is performed for 5-15 min; c. the oat bran is mixed with a mixed solvent of petroleum ether and ethanol, immobilized lipase and natural antioxidant are added, and extraction is performed for 8-12 h, and then filtration separation is performed; d. the first residue is mixed with the mixed solvent, extraction is performed for 4-6 h, and then filtration separation is performed; e. the first supernatant and the second supernatant are combined, the solvent is recovered by reduced pressure distillation, and oat crude oil is obtained; and f. the immobilized lipase is recovered. The method is mainly used for efficiently extracting high-quality oat oil from oat bran.