184 results about "Supercritical fluid extraction" patented technology

The invention relates to the related technical field of extraction of active ingredients in roselle calyx, and particularly provides an extract based on roselle oil and roselle polypeptide as well as an extraction method and application of the extract. The extraction method comprises the following steps: S1, sequentially performing crushing treatment and supercritical fluid extraction treatment on roselle calyx to obtain a roselle oil extract and flower residues; s2, the roselle residues are sequentially subjected to fermentation treatment and enzymolysis treatment, and a roselle polypeptide extract is obtained; wherein a strain used in the fermentation treatment is selected from at least one of saccharomyces cerevisiae, bacillus subtilis and lipomyces starkeyi; an enzyme used in the enzymolysis treatment is selected from at least one of acid protease and compound protease; the extract comprises the roselle oil extract and the roselle polypeptide extract. The extraction method provided by the invention improves the extraction rate of active ingredients extracted from roselle calyx.

The invention discloses industrial-grade mixed oil produced by utilizing kitchen waste oil and a preparation method of the industrial-grade mixed oil, and belongs to the technical field of recycling of the kitchen waste oil. The invention relates to industrial-grade mixed oil produced by using kitchen waste oil and a preparation method thereof, and the preparation method comprises the following steps: firstly collecting kitchen waste containing the waste oil, and storing the kitchen waste in a container through special equipment; carrying out screen solid-liquid separation, cleaning grease on the surface of the solid waste, and then carrying out precipitation separation; then carrying out centrifugal separation, chemical cleaning, water washing, acid treatment, dehydration, degumming and metal ion removal on the separated grease and oil-containing liquid; carrying out ultrasonic-assisted multistage ester exchange after enzymolysis optimization, carrying out membrane separation on glycerol and fatty acid methyl ester, and carrying out reduced pressure distillation to obtain a high-purity fraction; carrying out adsorption refining, plasma treatment and supercritical fluid extraction; finally, nano particles are added and blended with additives, efficient recycling of the kitchen waste oil is achieved, and then high-purity industrial-grade mixed oil is prepared.

The invention discloses a method for preparing ultra-high-purity quartz by multi-stage synergistic purification of quartz ore, and belongs to the technical field of ultra-high-purity quartz preparation. According to the method, natural quartz ore is used as a raw material, mineral impurities, lattice impurities and inclusions in quartz are deeply removed through multi-stage synergistic processes such as low-temperature plasma activation, biological leaching, supercritical CO2-assisted acid leaching, microwave-assisted chloridizing roasting and pulsed electric field enhanced acid leaching, and finally a high-purity quartz product with the SiO2 purity larger than or equal to 99.998% (4N8 grade) is obtained. According to the invention, a low-temperature plasma activation technology, microbial metallurgy, supercritical fluid extraction and a pulsed electric field strengthening technology are organically combined, so that the energy efficiency bottleneck and environmental protection limitation of a traditional high-purity quartz preparation process are broken through; the obtained quartz sand product can reach the standards of high-purity quartz sand for semiconductor quartz glass and high-purity quartz sand for photovoltaic quartz crucibles.

The invention relates to a method for continuously synthesizing a dapagliflozin intermediate, and belongs to the technical field of drug intermediate synthesis. The method comprises the following steps: mixing 5-bromo-2-chloro-4 '-ethoxydiphenylmethane, a photocatalyst and THF (tetrahydrofuran), introducing the mixture into an ultraviolet light catalytic micro-channel for pre-activation to generate an aryl free radical intermediate, namely a pre-activation solution, carrying out contact reaction on the pre-activation solution and a THF solution of 2, 3, 4, 6-tetra-O-trimethylsilyl-D-glucolactone in a low-temperature coupling area of a micro-reactor, and carrying out purification, purification and purification to obtain the aryl free radical intermediate. The reaction liquid is introduced into a dynamic quenching zone and is mixed with supercritical CO2 on line, an intermediate I is obtained through supercritical fluid extraction and separation, and the photocatalyst is recycled; the method has the advantages of high reaction efficiency, convenience in catalyst recovery and simplicity in product separation.

The invention provides a composition for improving sleep quality as well as a preparation method and application thereof, and belongs to the technical field of medicines. The preparation method comprises the following steps: performing supercritical fluid extraction on lavender, violet, rose and agilawood to obtain extracted oil, performing solid enzymolysis, performing immobilized ionic liquid extraction, and performing desorption to obtain extracted oil, and uniformly mixing the extracted oil with the extracted oil and a penetration enhancer to obtain the composition for improving the sleep quality. The prepared extract oil and the extract oil are mixed, and the penetration enhancer is added, so that the prepared composition for improving the sleep quality enters a human body through skin absorption, achieves the effects of regulating qi activity of viscera and regulating yin and yang of the body, has the effects of soothing the nerves, helping sleep, prolonging the sleep time, improving the sleep effect and relieving nervous mood, and has a wide application prospect.

The invention discloses a superconducting carbon black co-production method based on directional refining of catalytic slurry oil and a product thereof, and belongs to the technical field of carbon black preparation, and the method comprises the following steps: mixing the catalytic slurry oil and catalytic circulating oil to obtain mixed slurry oil, and adding a deliming agent for settling separation to obtain purified slurry oil; carrying out continuous solvent extraction on the obtained purified oil slurry to respectively obtain an aromatic component and a heavy component; carrying out thermal polycondensation reaction on the obtained aromatic component in a magnetic field environment in the presence of a catalyst and a cross-linking agent, and then carrying out supercritical fluid extraction to obtain spinnable mesophase pitch; carrying out slurry reactor hydrogenation deconstruction on the obtained heavy component to obtain stable micromolecular carbon black raw oil, mixing the carbon black raw oil with a nitrogen source and a template precursor, carbonizing, and carrying out acid pickling to obtain the superconducting carbon black; through a heavy oil slurry reactor hydrogenation deconstruction'doping-template 'synergistic carbonization strategy, the superconductive carbon black with nitrogen / phosphorus co-doped and developed hierarchical porous structure is constructed in situ by a one-step method.

The invention relates to an extraction method and application of a sarcodia montagneana extract for inhibiting bacteria, removing dandruff, controlling oil and relieving, and belongs to the technical field of sarcodia montagneana extracts. The extraction method of the sarcodia montagneana extract comprises the following steps: cleaning fresh sarcodia montagneana with deionized water, soaking the cleaned sarcodia montagneana in a compound solution, grinding the soaked sarcodia montagneana to obtain slurry, freeze-drying the slurry, putting the freeze-dried slurry into a supercritical fluid extractor, adjusting corresponding temperature and pressure, and then extracting the freeze-dried sarcodia montagneana by using a supercritical fluid extractor; and fully contacting the supercritical fluid with the sarcodia montagneana powder, performing extraction treatment, and adjusting pressure through a pressure reducer for separation to obtain the sarcodia montagneana extract. The sarcodia montagneana extract contains galactose, fucose, mannose and glucuronic acid, has a remarkable removal effect on ROS and DPPH free radicals, has high antioxidant activity, can serve as a natural antioxidant and has good effects of inhibiting bacteria, removing dandruff, controlling oil and relieving.

The invention relates to an ultra-clean high-purity polyethylene purification process based on supercritical fluid extraction, which is characterized in that supercritical CO2 containing an entrainer is used as a medium to wash polyethylene powder, and the entrainer comprises the following components: an acid solution, an alcohol solvent and a chelating agent. Compared with the prior art, the method has the advantages that the polyethylene powder is purified on the basis of the supercritical CO2 containing the entrainer, residual organic impurities in polyethylene can be deeply removed, meanwhile, the acid solution, the alcohol solvent, the chelating agent and the like are used as the entrainer, metal and other impurities which are difficult to dissolve in the supercritical CO2 are converted into soluble components, and the purity of the polyethylene powder is improved. And the polyethylene is separated from the polyethylene powder, so that deep purification of the polyethylene is realized.

The invention discloses a regenerated slurry preparation method based on recycled ceramic casting membranes, and belongs to the technical field of ceramic slurry preparation, and the method comprises the following steps: S1, pretreatment, fine crushing and deep extraction, and supercritical CO2 fluid extraction after crushing treatment; s2, thermal degreasing and activation: step-by-step temperature control removal and surface modification step-by-step heating thermal degreasing: in the first stage, the temperature is 150-250 DEG C, and heat preservation is performed for 1-2 hours; in the second stage, the temperature is 300-400 DEG C, and heat preservation is conducted for 0.5 h; s3, a plasma surface activation process: putting the ceramic powder into low-temperature plasma treatment equipment, introducing a mixed gas of argon and oxygen as a working gas, and treating under the action of specific radio frequency or microwave power; s4, slurry reconstruction, precise formula and optimized dispersion gradient powder mixing, wherein regenerated ceramic powder and new ceramic powder are mixed; and constructing a dispersion system: adding a solvent and a composite dispersant, and carrying out dispersion ball milling.

The invention discloses an extraction method for tea essence, which adopts a method of combining ultrasonic wave and supercritical fluid extraction, not only significantly improves the extraction efficiency of the tea essence, but also can effectively retain the natural flavor and healthy components of tea, and through ultrasonic treatment, tea cell walls are destroyed, and the release of effective components is accelerated; the supercritical fluid extraction is used for efficiently extracting target components under a low-temperature condition, heat loss and oxidation reaction are reduced, and the method has relatively high extraction efficiency and relatively low energy consumption, is suitable for industrial large-scale production, and is beneficial for improving product quality and economic benefits.

The invention relates to the technical field of daily chemical and skin external preparations, in particular to a six-dimensional synergistic effect-based acne removal and repair composition, which is prepared from the following active ingredients in parts by weight: 1 to 10 parts of sturgeon caviar extract, 0.1 to 10 parts of chlorogenic acid, 0.1 to 20 parts of 4-tert-butyl cyclohexanol and 0.1 to 20 parts of willow extract. The sturgeon caviar extract is prepared by supercritical CO2 fluid extraction, the willow extract is treated by a synthase process, the content of salicin is not less than 1.5 wt%, and at least one active component in the composition is subjected to supramolecular inclusion modification; the preparation method comprises the following steps: sequentially preparing the extracts and components, sequentially mixing, and finally carrying out an inclusion reaction. The composition constructs a full-link acne removal and skin health maintenance system through a six-dimensional synergistic effect of bacteriostasis, oil control, anti-inflammation, allergy relief, cutin dredging and repairing, has the characteristics of efficient acne removal, mildness, safety and low recurrence rate, is suitable for various skin types such as sensitive acne skin, and can be widely applied to acne removal products of various dosage forms.

The invention belongs to the technical field of activated carbon preparation, and relates to a production process of injection activated carbon with bamboo as a matrix. The method comprises the following steps: S1, carefully selecting and preparing materials: selecting healthy moso bamboos which are 4-6 years old and have the diameter of 5-8cm, and treating the moso bamboos within one week after cutting down the moso bamboos; according to the method, bamboos are used as raw materials, the source is wide, growth is fast, regeneration is achieved, dependence on traditional raw materials is reduced, and sustainable development is facilitated; the method comprises the steps of primary alkaline leaching combined with ultrasonic treatment, secondary alkaline leaching activation combined with microwave and specific gas activation, multi-stage acid pickling, ball milling shaping, supercritical fluid extraction, high-temperature steam blowing, drying sterilization and the like, impurities are effectively removed, the purity and the adsorption performance of the activated carbon are improved, and the prepared activated carbon is low in impurity content, good in sphericity degree, uniform in particle size and suitable for industrial production. The prepared activated carbon has excellent adsorption performance, is sterile and pyrogen-free, completely meets the strict requirements of injection activated carbon, and can be widely applied to the pharmaceutical industry.

The invention discloses a composition for growing and nourishing hair as well as a preparation method and application thereof. The composition is prepared from various components including 20 to 30 parts of cacumen biotae extract, 2 to 7 parts of eclipta prostrata extract, 3 to 9 parts of specnuezhenide and the like. The preparation method comprises the steps of raw material pretreatment, active ingredient extraction, compound blending, microcapsule embedding and preparation forming, the cacumen biotae is subjected to a supercritical extraction process, and the eclipta prostrata is subjected to an ultrasonic-assisted enzymolysis-subcritical water extraction combined process. Experiments show that the composition can significantly increase the hair growth rate, maintain the hair follicle growth period, increase the diameter of a hair bulb part, effectively improve hair follicle health through the synergistic effects of activating hair follicle stem cells, inhibiting apoptosis and the like, and can be applied to preparation of hair care products for promoting hair growth.

The present invention discloses a novel method of isolating pure bakuchiol, substantially free of furanocoumarins (psoralen and isopsoralen) from the seeds of Psoralea sp using a combination of processes that include supercritical fluid extraction, high vacuum distillation and column purification. The invention also disclose compositions comprising bakuchiol that is free of furanocoumarins.

This invention belongs to the field of cosmetic raw material preparation technology, specifically relating to a method for preparing a low-odor Xinjiang Lithospermum extract, its product, and its application. The method includes: raw material pretreatment: drying and pulverizing Xinjiang Lithospermum raw material to obtain pretreated material; first-stage extraction: loading the pretreated material into a supercritical fluid extraction device, adding a composite entrainer for extraction, and collecting the first fraction in a first separator; second-stage extraction: collecting a second fraction rich in naphthoquinone components in a second separator; and post-treatment: concentrating the second fraction and removing the alcohol solvent to obtain the low-odor Xinjiang Lithospermum extract. This invention can separate and discard most of the odor-causing volatile components in the raw material under mild conditions in the first stage, and then efficiently extract the core active substances of naphthoquinone in the second stage, achieving a significant reduction in the odor of the extract and a significant improvement in its sensory quality.

The invention relates to the technical field of traditional Chinese medicine pharmacy, and discloses a preparation method of a traditional Chinese medicine external preparation for arthralgia based on blood circulation promoting and blood stasis removing, which comprises the following steps: extracting ferulic acid from angelica sinensis and ligusticum wallichii by adopting a supercritical CO2 fluid extraction process; extracting safflower, frankincense and other medicinal materials to obtain a synergistic active ingredient extract; the ferulic acid is used as a first hydrogen bond donor to react with lauric acid used as a temperature-sensitive phase change hydrogen bond donor and choline chloride used as a hydrogen bond acceptor, and the temperature-sensitive bioactive ternary eutectic solvent is prepared; loading the synergistic active ingredient extract in the solvent at low temperature to form a medicine mother solution; and finally, mixing the medicine mother liquor with auxiliary materials to prepare the external preparation. Ferulic acid in medicinal materials serves as a structural unit of a functional solvent, the solvent prepared under the mild condition has biological activity and temperature-sensitive phase change characteristics, a medicine storage cavern can be formed on the skin surface in situ, long-acting slow release and efficient transdermal absorption of active ingredients are achieved, and the curative effect and safety of a preparation are improved.

The present disclosure relates to a process for purifying the lithium salt of bis(fluorosulfonyl)imide (LiFSI), in which the purified LiFSI is extracted from crude LiFSI through supercritical fluid extraction. The present invention also relates to the purified LiFSI obtained therefrom and the use of such LiFSI in an electrolyte for a battery.

This invention provides a washing system and method for calcium fluoride granules produced through nucleation granulation, comprising a plasma surface activation module, a supercritical fluid extraction washing module, and an intelligent control and circulation module connected in sequence. The plasma surface activation module is used to perform surface modification and impurity weakening treatment on pre-dried calcium fluoride granules. The supercritical fluid extraction purification module is used to deeply remove impurities from the surface and pores of the granules under anhydrous conditions. The intelligent control and circulation module is signal-connected to the aforementioned modules and is used to dynamically regulate the entire purification process based on online monitoring data. The plasma surface activation module includes a vibrating fluidized bed with a reaction chamber, solving the problem of incomplete removal of stubborn surface impurities by traditional water washing. Ultimately, the surface impurity removal rate of the calcium fluoride granules is stabilized at over 95%, and the product purity reaches a high standard for resource utilization.

The invention belongs to the technical field of tobacco flavors and fragrances, and particularly relates to preparation and application of a coffee flavor. Comprising the following steps: placing cleaned coffee berries in an aged oak wine barrel, capping and sealing, and fermenting and degumming under low-temperature and low-oxygen conditions to obtain green coffee beans; the method comprises the following steps: baking green coffee beans in a baking oven until the coffee beans are brown or reddish brown and the surfaces of the coffee beans have obvious grease; and grinding the baked coffee beans into uniform powder, and performing low-temperature extraction or supercritical fluid extraction to obtain the coffee essence. According to the technical scheme, the suitability of the coffee essence and cigarette products is optimized, the taste is improved, the irritation is reduced, the scorched bitter feeling of the coffee essence is reduced, the baking fragrance and the sweet fragrance are highlighted, the coffee essence is endowed with unique bouquet through wine barrel fermentation, and the stability and the certainty of an essence formula are improved.

The invention relates to the technical field of traditional Chinese medicine extraction, in particular to a traditional Chinese medicine supercritical fluid extraction device and method. The traditional Chinese medicine supercritical fluid extraction device comprises an extraction tank, a first heat exchanger, a separation tank, a collection box, a second heat exchanger, a gas booster pump, a carbon dioxide storage tank and a disassembly and assembly mechanism. The electromagnetic plate and the sealing plate are tightly connected only by placing the electromagnetic plate in the embedded groove, electrifying the electromagnetic plate to generate magnetism and magnetically attracting the electromagnetic plate, the sliding seat is driven by the driving assembly to slide on the mounting guide rail, the sealing plate is disassembled and assembled at the corresponding through groove, and the height of the connecting arm is adjusted through the lifting arm. By means of the structure, when the traditional Chinese medicinal materials on the partition plate located at the high position of the extraction tank need to be fed and discharged, operation is more convenient.

The present application provides a method for extracting fatty acids from a lipid-rich marine organism starting material comprising a) exposing the starting material to a supercritical fluid at a defined temperature and a defined pressure; and b) collecting the extract containing the fatty acids. The starting material may undergo various pretreatment steps prior to supercritical fluid extraction, including drying, pulverizing, and / or soaking in an organic solvent.

The application belongs to the technical field of natural product extraction, and provides high-purity curcumin powder and an extraction method thereof. The extraction method of the high-purity curcumin powder comprises the following steps: (1) fresh turmeric is sliced, dried, and then crushed, supercritical CO2 extraction is adopted, and curcumin oil, curcumin powder, and residues are separated; (2) the residues are subjected to fermentation-type ethanol extraction to obtain an alcohol extract; (3) the curcumin powder and the alcohol extract are combined, subjected to macroporous resin adsorption, eluted with ethanol, and then concentrated to obtain a concentrated solution; and (4) the concentrated solution is recrystallized, washed, dried, and then high-purity curcumin crystals are obtained. The extraction method adopts supercritical CO2 fluid extraction coupled with fermentation-type ethanol extraction, and the technology of gradient cooling recrystallization of ethanol and water after macroporous resin adsorption, and the steps are used and operated in cooperation. The product obtained by using the extraction method has high yield and purity, low production cost, small amount of organic solvent, and is suitable for industrial production.

The invention relates to the technical field of injection molding material synthesis, and discloses a low-odor automotive polypropylene composite material and a preparation method thereof, and the preparation method comprises the following steps: S1) preparing raw materials according to a formula, and uniformly mixing to prepare a premix; s2) adding the premix into a twin-screw extruder, and injecting supercritical CO2 fluid into a melting section of the twin-screw extruder which is provided with a two-stage vacuum pump and a condensation separation device; and S3) extruding, pelletizing and devolatilizing to obtain the low-odor automotive polypropylene composite material. The polypropylene resin and the POE resin are respectively subjected to adsorption pretreatment by the activated carbon felts, and the activated carbon felts are used for adsorbing volatile organic compounds of the resin materials; the lamellar structure of the talcum powder is relatively complete, the purity is high, the impurity content is low, and the existence of metal oxides is reduced; volatile organic compounds are extracted by supercritical CO2 fluid and migrated, and then the volatile organic compounds are removed by a vacuum pump, so that the odor grade of the polypropylene composite material can be reduced.

To provide long circulating material free (LCMF) poloxamer compositions and uses thereof, in particular, LCMF poloxamer 188 compositions and uses thereof, and to provide supercritical fluid extraction (SFE) methods and high pressure (subcritical) methods for preparing poloxamer compositions, particularly the LCMF poloxamer compositions.SOLUTION: The LCMF poloxamer 188 is a polyoxyethylene / polyoxypropylene copolymer that has the formula HO(CH2CH2O)a'-[CH(CH3)CH2O]b-(CH2CH2O)aH, wherein: each of a and a' is an integer such that the percentage of (C2H4O) is between 60 to 90 wt.% of the total molecular weight of the copolymer; b is an integer such that the molecular weight of (C3H6O) is between 1,300 and 2,300 Da; 1.5% or less of the total components are low molecular weight components and 1.5% or less of the total components are high molecular weight components; the polydispersity value of the LCMF poloxamer is less than 1.07; and the circulating half-life of the LCMF poloxamer is less than 5.0-fold of the predetermined circulating half-life.SELECTED DRAWING: None

The invention relates to the technical field of oral thick paste preparation processes, in particular to an oral thick paste with an asthenopia relieving effect, the oral thick paste raw materials comprise core raw materials, the core raw materials comprise, by weight, 3-8 parts of chrysanthemum, 0.5-3 parts of dendrobium officinale, 3-8 parts of Chinese wolfberry, 3-8 parts of poria cocos, 3-8 parts of black sesame and 1-3 parts of prebiotics; the decoction process of the oral thick paste sequentially comprises the steps of pretreatment, extraction, concentration and paste collection, a step-by-step extraction mode or an enzymolysis-assisted extraction mode is adopted in the extraction step, or a mode of combining supercritical fluid extraction with water extraction is adopted in the concentration step, a gradient concentration mode and a microwave-assisted concentration mode are adopted in the concentration step, and an ultrasonic-assisted paste collection mode is adopted in the paste collection step. The eye protection effect is more comprehensive, prebiotics, blueberries, mulberries and the like are further introduced, and medicinal and edible components such as codonopsis pilosula, lily and the like are further introduced in the scheme and have a synergistic effect with other raw materials, so that a multi-target eye protection system for regulating intestinal tracts and nourishing eyes is constructed.

The present invention relates to a dispersion comprising acellular dermal matrix microparticles, a filler comprising the same, and uses thereof. More specifically, the present invention relates to a filler comprising a dispersion containing acellular dermal matrix microparticles obtained by supercritical fluid extraction and high pressure dispersion operations, and a method for preparing the same. The acellular dermal filler according to the present invention has excellent biological stability and biocompatibility, and extracellular matrix components such as collagen and elastin are significantly preserved therein. In addition, the filling agent also shows excellent biochemical stability, the pH value or the collagen content and the elastin content are kept unchanged in the storage process, and the filling agent also shows physical stability and can continuously maintain injectability. Therefore, the acellular dermal filler can be effectively used as an injectable filler for repair or volume expansion of soft tissue and reduction of wrinkles in the field of plastic and regenerative medicine.

The invention discloses a pancreas-eliminating traditional Chinese medicine preparation for treating diabetes mellitus, which is prepared from the following components in parts by weight: 8 to 20 parts of bitter gourd extract, 6 to 20 parts of rhizoma atractylodis, 8 to 20 parts of rhizoma atractylodis macrocephalae, 10 to 25 parts of poria cocos, 10 to 25 parts of ramuli euonymi and 10 to 25 parts of fried semen raphani. The traditional Chinese medicine can effectively reduce blood sugar and improve chronic complications caused by diabetes mellitus, and effective components in the medicinal materials have a synergistic effect, so that the effect of treating diabetes mellitus can be more comprehensively exerted; according to the method, effective components such as bitter gourd, ferulic acid and chlorophyll are extracted by using a supercritical fluid extraction technology, the extraction efficiency can be improved, the stability and biological activity of the active components can be maintained, and compared with a traditional decoction method, the effective components in the medicinal materials can be more efficiently extracted by using technologies such as ultrasonic-assisted extraction or hydrothermal extraction; the dissolution of harmful substances is reduced, and the safety and curative effect of the preparation are improved.

The invention discloses a method for recovering gold from a circuit board, and relates to the technical field of precious metal refinement, and the method comprises the following steps: carrying out preliminary crushing on the circuit board, and heating the crushed circuit board to obtain a gold-containing polished board; a supercritical fluid extraction technology is used for extracting the gold-containing light plate, dissolved organic components are separated out, and a pure metal substrate is obtained; the metal substrate is put into a gold leaching tank containing hydrochloric acid and hydrogen peroxide, and leaching liquid containing gold ions is obtained; zinc powder is used for reducing gold ions in the leaching solution containing the gold ions, and part of solid gold is obtained; further reducing the residual gold ions in the leaching solution containing the gold ions by using oxalic acid to obtain solid gold which is not reduced by the zinc powder; pure gold mud is obtained through acid pickling, water washing and drying of solid gold. According to the method, the zinc powder is used for reducing the gold ions in the leaching solution containing the gold ions, most of the gold ions can be effectively recovered through reduction of the zinc powder, and the gold ions which cannot be completely reduced by the zinc powder are treated through reduction of oxalic acid, so that maximum recovery of the gold ions is ensured.

The invention provides a wormwood composition and a preparation method thereof, and belongs to the technical field of medicines. The preparation method comprises the following steps: carrying out supercritical fluid extraction and molecular distillation on traditional Chinese medicine powder and Qichun Dragon Boat Festival moxa to obtain traditional Chinese medicine essential oil, carrying out solid extraction to obtain a water-soluble active component and an oil-soluble active component, embedding the water-soluble active component to obtain nanoscale capsule powder, adding the nanoscale capsule powder, the oil-soluble active component and an oleophylic emulsifier into the traditional Chinese medicine essential oil, and uniformly mixing to obtain the traditional Chinese medicine essential oil. The preparation method comprises the following steps: dropwise adding an aqueous solution containing a hydrophilic emulsifier and sodium alginate, emulsifying, curing, preparing blasting beads, adding the blasting beads, an atomizing agent and a surfactant into a chitosan solution, mixing, cross-linking, and adjusting the water content, so as to prepare the wormwood composition, in a low-temperature heating process, the blasting beads can be promoted to be broken, contents can be promoted to escape, aerosol is formed along with volatilization of water vapor and traditional Chinese medicine essential oil, and the wormwood composition can be used for preventing and treating diseases. The components are purer, PM2.5 particles are not contained, harm to human health is avoided, the pesticide effect is greatly improved, and the composition is safer, healthier, green and environmentally friendly and has wide application prospects.

The invention discloses a supercritical carbon dioxide flow heat transfer experiment system which comprises a carbon dioxide steel cylinder and a subcritical carbon dioxide tank connected with the gas outlet end of the carbon dioxide steel cylinder, a heating belt is installed on the outer surface of the carbon dioxide steel cylinder, and a cooling pipe is installed on the outer surface of the subcritical carbon dioxide tank. And a vacuum pumping interface and a high-pressure stop valve are arranged between the carbon dioxide steel cylinder and the subcritical carbon dioxide tank. The device has the beneficial effects that subcritical carbon dioxide liquid can be effectively pressurized to a supercritical state by utilizing the diaphragm metering pump, and the device has excellent performance in application scenes needing high-pressure carbon dioxide, such as the fields of supercritical fluid extraction, material treatment and the like due to the efficient pressurizing capability; the device can perform supercritical carbon dioxide flow heat transfer experiment research on test single tubes with different pressures and temperatures and different specifications, is suitable for various industrial and research scenes due to the wide pressure adjusting range, and enhances the market adaptability and application value.