82results about How to "Mild operating conditions" patented technology

The invention provides a high-temperature-resistant carbon fiber reinforced phenolic resin composite material and a preparation method thereof. The preparation method comprises the following steps: firstly, carrying out high-temperature oxidation treatment on carbon fibers; secondly, carrying out surface modification on the carbon fibers by using a chemical modifier; then mixing the modified carbon fiber, an antioxidant and a dispersing agent to prepare slurry; performing vacuum filtration on the prepared slurry, and drying to obtain a carbon fiber blank; preparing a phenolic resin infiltration solution, and impregnating the carbon fiber blank with the phenolic resin infiltration solution; and finally, carrying out mold pressing and curing to obtain the high-temperature-resistant carbon fiber reinforced phenolic resin composite The preparation method is simple in required equipment, convenient to operate, stable in process, high in production efficiency and suitable for large-scale industrial production. According to the high-temperature-resistant carbon fiber reinforced phenolic resin composite material prepared by the preparation method, the bonding property between the carbon fiber and the phenolic resin is improved, certain toughness and strength are provided, and meanwhile, the high-temperature-resistant carbon fiber reinforced phenolic resin composite material has the advantages of ablation resistance, good oxidation resistance in a high-temperature environment and the like.

The invention provides a soak solution for a corneal contact lens, a preparation method of the soak solution and the corneal contact lens, and the soak solution is mainly prepared from the following raw materials in percentage by mass: 0.01%-0.15% of litamilast, 0.01%-0.15% of sodium dodecyl benzene sulfonate, 0.01%-0.15% of sodium dodecyl benzene sulfonate and the balance of water. 0.1%-2% of buffer salt; 0.2%-1.2% of sodium chloride; 0-0.5% of sodium thiosulfate; and 97%-99% of purified water. The soak solution for the corneal contact lens prepared by the invention can well interact with water molecules in the corneal contact lens, so that drug molecules in the soak solution are well replaced in the corneal contact lens, and the drug molecules are retained in a gel network of the corneal contact lens; the bioavailability of the medicine is improved while high medicine loading capacity is realized, and the corneal contact lens prepared from the soak solution has the effect of slowly releasing the medicine, directly acts on eyes and can reduce the toxic and side effects of the medicine.

The invention is suitable for the technical field of chemical industry, and provides a method for preparing polycarbonate diol by using a titanate catalyst, which comprises the following steps: step 1, transesterification: mixing dimethyl carbonate and 1, 6-hexanediol according to a molar ratio of 1.1-1.5: 1, adding isopropyl titanate which accounts for 0.01-2% of the total raw material amount as a catalyst, and reacting at the temperature of 50-60 DEG C for 1-3 hours; carrying out transesterification on the mixture; step 2, carrying out condensation polymerization to obtain a polycarbonate diol crude product; and step 3, carrying out reduced pressure purification, and removing the small molecular polymer and the residual titanium isopropoxide catalyst to obtain the high-purity polycarbonate diol. According to the present invention, the efficient titanium isopropoxide catalyst is used under the normal pressure, such that the preparation of the high-purity and narrow-molecular-weight-distribution polycarbonate diol is achieved, the operation condition is mild, the production efficiency is high, the cost is low, and the catalyst has characteristics of low boiling point, easy removal and environmental protection.

The invention provides a heparin precursor content detection method and application thereof, and the detection method comprises the following steps: (S1) preparing a heparin precursor solid sample to be detected into a heparin precursor test solution, or diluting a heparin precursor liquid sample to be detected into the heparin precursor test solution; carrying out enzymolysis on the heparin precursor test solution or the heparin precursor reference substance solution by adopting heparinase III to obtain heparin precursor test solution enzymatic hydrolysate or heparin precursor reference substance enzymatic hydrolysate; determining the peak area of the enzymatic hydrolysate by adopting a high performance liquid chromatography method; (S2) performing linear regression by applying a least square method, and establishing a mathematical relationship between the peak area Y of the heparin precursor reference substance enzymatic hydrolysate and the concentration X of the heparin precursor reference substance solution, namely Y = kX + b; and calculating the concentration of the heparin precursor in the liquid sample or the content of the heparin precursor in the solid sample according to the established mathematical relationship. The liquid phase detection method provided by the invention is higher in accuracy and good in precision, and can provide a detection result more intuitively.

The invention discloses a high-permeability-selectivity nanofiltration membrane with a bead-like structure and a preparation method and application thereof, and belongs to the technical field of membrane separation, the preparation method comprises the following steps: (1) preparing a water-phase solution by using a water-phase monomer and a nonionic surfactant, the nonionic surfactant is a polyoxyethylene type nonionic surfactant and is selected from fatty alcohol-polyoxyethylene ether, fatty acid polyoxyethylene ether or fatty amine polyoxyethylene ether; and (2) carrying out interfacial polymerization reaction on the water-phase solution prepared in the step (1) and the acyl chloride monomer oil-phase solution on a micro-filtration bottom membrane to prepare the high-permeability-selectivity bead-stringed structure nanofiltration membrane. The method is simple in process and low in equipment requirement, and the prepared nanofiltration membrane with the bead-like structure is high in univalent and multivalent salt separation capacity while keeping high permeability, and has a good application prospect in the field of water treatment.

The invention relates to an ink-jet printing ink formula and a preparation method thereof, and belongs to the technical field of ink preparation. The carbon black color paste specifically comprises the following raw materials in parts by mass: 3 to 7 parts of carboxylated carbon black, 2 to 4 parts of modified protein, 1 to 3 parts of a dispersant, 0.1 to 0.3 part of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 0.1 to 0.12 part of N-hydroxysuccinimide, 1 to 5 parts of a 2-morpholinoethanesulfonic acid buffer solution, 0.1 to 0.3 part of an auxiliary agent and 10 to 50 parts of a composite solvent. The polyethylene glycol modified ethanol clostridium protein is used in the components, and carboxylated carbon black and the dispersing agent are combined, so that the compatibility among the components in the system is improved, and good thermal stability and system stability are achieved while the particle size of the black ink is refined.

The invention relates to the technical field of waste hydrogenation catalyst treatment, and discloses a recovery method of active metal in a waste hydrogenation catalyst, a preparation method of a residual oil hydrogenation catalyst and application of the residual oil hydrogenation catalyst, and the method comprises the following steps: (1) leaching the waste hydrogenation catalyst by using an acid solution to obtain a leachate; (2) the concentration of hydrogen ions in the leachate is adjusted to be 0.05-2 mol / L, then the leachate is in contact with a first extraction agent, washing and reverse extraction are conducted, and a Mo solution is obtained; (3) adjusting the pH value of the first raffinate to 1-2.1, then contacting the first raffinate with a second extraction agent, and then carrying out washing and reverse extraction to obtain an Al solution; and (4) adjusting the pH value of the second raffinate to 2.2-3.5, then contacting the second raffinate with a third extraction agent, and then carrying out washing and reverse extraction to obtain a Ni and / or Co solution. The method can realize hazardous waste resource utilization, and can significantly reduce the production cost of the hydrogenation catalyst.

The invention provides an efficient oil-removing water purifying agent and a preparation method thereof. The oil-removing water purifying agent mainly comprises a micro-crosslinking multi-branched cationic copolymer, fatty acid methyl ester ethoxylate, dodecyl dimethyl benzyl ammonium chloride and deionized water. The micro-crosslinked multi-branched cationic copolymer is mainly prepared from a non-polar solvent, a branched monomer, a crosslinking monomer, acrylamide, a cationic monomer, an emulsifier, an initiator, an organic solvent and deionized water, and the fatty acid methyl ester ethoxylate is mainly prepared from methyl stearate, a catalyst, ethylene oxide, isopropanol and deionized water. The efficient oil-removing water purifying agent mainly aims at the defects of an existing oil-removing water purifying agent, the micro-crosslinking multi-branched cationic copolymer is used as a flocculating agent, the fatty acid methyl ester ethoxylate is used as a nonionic surfactant, and through the synergistic effect of the micro-crosslinking multi-branched cationic copolymer and the fatty acid methyl ester ethoxylate, the efficient oil-removing water purifying agent is obtained. Therefore, the prepared oil-removing water purifying agent has better oil-removing effect and dispersing performance.

The invention provides an ultra-low carbon butyraldehyde synthesis device and a synthesis method thereof, the device comprises an enhanced reaction tower, an enhanced unit is arranged at the bottom of the enhanced reaction tower, and a grating is arranged above the enhanced unit; a mixed gas feed port and a propylene feed port are formed in the bottom of the enhanced reaction tower, a discharge port and a reflux pipeline are further arranged on the tower side of the enhanced reaction tower, and a circulating pump is arranged on the reflux pipeline; a catalyst recovery pipeline is arranged on the outer side of the enhanced reaction tower, the catalyst recovery pipeline is connected with the enhanced reaction tower through the discharge port, and the catalyst recovery pipeline comprises a heat exchanger, a sedimentation tank and a gas washing tower which are connected in sequence. According to the butyraldehyde synthesis device disclosed by the invention, the reaction efficiency and the product yield in butyraldehyde synthesis are improved mainly in a manner of combining the strengthening unit and the catalyst recovery pipeline, so that the catalyst recovery rate is higher while the reaction is more sufficient and thorough, and the energy consumption in catalyst recovery is greatly reduced.

The invention discloses a (002) crystal face oriented zinc powder negative electrode material as well as a preparation method and application thereof, and belongs to the technical field of secondary batteries. According to the preparation method disclosed by the invention, the zinc powder is adopted as a raw material, the optimization of the form and crystal face structure of the zinc powder is realized by controlling the processes of ball milling treatment and annealing treatment, and the (002) crystal face oriented zinc powder negative electrode material is formed through induction, so that the formation of zinc dendrites is effectively inhibited, and a more compact stacking morphology is presented; and compared with the traditional zinc foil negative electrode, the utilization rate of zinc is remarkably improved, and the energy density of the battery is favorably improved.

The invention belongs to the technical field of petroleum composition analysis, and particularly relates to a method for separating and analyzing carboxylic acid compounds in petroleum. The method comprises the following steps: 1, dissolving a petroleum sample in an organic solvent A, and adding a solid-phase extraction column filled with an aminated MCM-41 molecular sieve; step 2, eluting the sample with an organic solvent B and the mixed solution C in sequence to obtain the carboxylic acid compound; and 3, dissolving the carboxylic acid compound by using an organic solvent D so as to adjust the sample injection concentration, and characterizing the molecular composition by using an electrospray ionization mass spectrometer. The analysis method provided by the invention can eliminate the influence of a petroleum matrix, and realizes fine separation and analysis of molecular compositions of carboxylic acid compounds in petroleum.

The invention discloses a process for separating copper and nickel from secondary nickel return materials, and relates to the technical field of hydrometallurgy, the process comprises the following steps: adding the secondary nickel return materials into alkali liquor for alkaline leaching, and filtering to obtain alkaline leaching liquor and alkaline leaching residues; adding the alkaline leaching residues into acid liquor for acid leaching, and filtering to obtain acid leaching liquor and acid leaching residues; adding the alkaline leaching solution into the acid leaching solution, stirring for reaction, and filtering to obtain filter residues and a neutralization solution; injecting the neutralization solution into adsorption equipment, performing desorption after adsorption is completed to obtain a copper ion desorption solution and a nickel ion desorption solution, and performing electrodeposition operation respectively to obtain copper metal and nickel metal; according to the method, the technical route of alkaline leaching, acid leaching, neutralization and adsorption separation is adopted, copper is selectively dissolved through alkaline leaching, nickel is dissolved through acid leaching, the pH is regulated in the neutralization process to achieve impurity separation, and finally graded adsorption of copper and nickel ions is conducted through a modified adsorbent.

According to the method for preparing the methyl heptenone through the Saucy-Marbet reaction of the 2-methyl-3-butene-2-alcohol and the 2-methoxypropene, by controlling the content of the key impurities tert-amyl alcohol and water in the raw materials, the reaction conversion rate can be larger than or equal to 99.5%, and the reaction selectivity can be larger than or equal to 98.5%. The method has the advantages of cheap and easily available catalyst, mild reaction conditions, simple operation and high reaction yield, and solves the problems of more three wastes, complex side reaction, difficult product purification and the like in the prior art.

The invention relates to the technical field of water treatment, and in particular to a phosphorus-free composite anti-scaling agent and a preparation method thereof, which are used to solve the problem that traditional anti-scaling agents usually contain phosphorus, and although they are widely available and inexpensive, they are not effective under high temperature conditions and are prone to cause eutrophication of water quality, thus exerting a negative impact on the environment. The phosphorus-free composite anti-scaling agent provided by the invention is composed of a specific anti-scaling polymer, an organic acid, a surfactant and an inorganic salt, can effectively prevent the formation of scale under high temperature conditions, has an excellent anti-scaling effect, does not contain phosphorus elements, avoids environmental problems caused by the use of phosphorus-containing anti-scaling agents, such as eutrophication of water quality, and is environmentally friendly. The preparation method of the invention is simple and easy to operate, has mild operating conditions, is pollution-free, does not discharge the three wastes, is safe and environmentally friendly, and is convenient for industrial production.

The invention discloses a method for selectively separating valuable metals from a positive electrode material of a waste lithium battery, and belongs to the technical field of resource recycling of waste lithium ion batteries. The method comprises the following steps: preparing an aprotic deep eutectic solvent (DES) as a leaching agent and an electrolyte at the same time; the method comprises the following steps: adding a waste positive electrode material into DES, and leaching to obtain a DES leaching-electrolyte system; according to the method, the pulse voltage is applied in stages, selective separation of nickel, cobalt and manganese is achieved by controlling the pulse peak voltage (the first stage is-0.8 V to-1.0 V, the second stage is-1.0 V to-1.2 V, and the third stage is-1.2 V to-1.5 V), and the pulse frequency and the duty ratio are used for regulating and enhancing mass transfer and restraining side reactions. According to the method, the metal deposition potential difference is expanded through DES coordination regulation and control, efficient selective separation of nickel, cobalt and manganese is achieved in combination with pulse step-by-step voltage control, and the method has the advantages of being high in separation efficiency, few in side reaction, simplified in process, high in product purity and the like.

The invention relates to the field of blood products, in particular to a preparation method of human activated C1 esterase. The preparation method comprises the following steps: carrying out contact adsorption on cryoprecipitate-removed human plasma and anion exchange resin, washing and eluting to obtain an eluent containing C1 proesterase, carrying out membrane filtration, and carrying out ultrafiltration desalination treatment; adding an anionic substance into the eluent, incubating in vitro to effectively activate the C1 esterase, and filtering by a membrane to obtain a feed liquid containing the activated C1 esterase; and carrying out purification treatment on the feed liquid to obtain the human activated C1 esterase, and carrying out cryopreservation. According to the method, an anion substance is introduced into an eluent system obtained through anion exchange, mild and effective activation of the C1 proesterase is achieved under the condition of not depending on foreign proteolytic enzyme, the risk of non-specific hydrolysis and self-cutting inactivation is remarkably reduced, good synergy is formed with a follow-up purification process, and the method is suitable for industrial production. The human activated C1 esterase product with relatively high activity and good stability is obtained.

The invention relates to a hollow silicon dioxide microsphere and a preparation method thereof. The preparation method comprises the following steps: mechanically stirring a solution of a surfactant to form foam, and introducing gas into the foam to obtain a bubble template; adding organosilane into the bubble template, and then adding an acid catalyst or a base catalyst to carry out hydrolytic condensation reaction, so as to form a silicon dioxide gel layer on the surface of the bubble, thereby obtaining a hollow silicon dioxide precursor; and sequentially carrying out drying treatment and calcining treatment on the hollow silicon dioxide precursor to obtain the hollow silicon dioxide microspheres. The preparation method provided by the invention has the advantages of simple operation, mild operation conditions, high production efficiency and low cost, is suitable for large-scale production, can realize efficient control of the particle size, the wall thickness and the hollow rate of the hollow silicon dioxide microspheres, and can meet the application requirements of multiple fields.

This invention discloses a method for ultrapurifying electronic-grade hydrochloric acid using gas membrane filtration and multi-stage distillation. The method includes: preheating industrial-grade hydrochloric acid feedstock and feeding it into a desorption column; desorption at a temperature above the azeotropic point of hydrogen chloride and water to obtain crude hydrogen chloride gas; cooling the obtained crude hydrogen chloride gas to above its dew point and then feeding it into a gas membrane separation unit for filtration using a hydrophobic porous or dense membrane to remove entrained droplets, particulate matter, and non-volatile metal impurities, obtaining purified hydrogen chloride gas; pressurizing and liquefying the obtained purified hydrogen chloride gas and then feeding it into a multi-stage distillation column system for continuous distillation. The multi-stage distillation column system includes at least two distillation columns connected in series, further removing trace impurities with boiling points similar to hydrogen chloride through gas-liquid mass transfer to obtain ultrapure hydrogen chloride liquid; vaporizing the obtained ultrapure hydrogen chloride liquid and isothermally absorbing it with ultrapure water in an absorption column to obtain electronic-grade hydrochloric acid product. This invention significantly reduces the impurity load of the distillation system.

The invention discloses a synthesis method of a low-cost acidic cut-off oxygen evolution catalyst, which comprises the following steps: (1) dissolving SnCl4. 5H2O, RuCl3 and NiCl2 in ethanol to prepare a mixed solution; (2) adding HCl into the mixed solution, and performing ultrasonic treatment to form a uniform solution; (3) transferring the uniform solution into a water bath, and keeping the reaction for several hours at a certain temperature until a solid solution is formed; (4) completely drying the solid solution in a drying oven to prepare a precursor; (5) carrying out annealing treatment on the precursor in air in a tubular furnace, and collecting a black product; and (6) cleaning the black product with water, and then cleaning with ethanol to remove impurities, thereby obtaining the low-cost acidic cut-off oxygen evolution catalyst. The catalyst disclosed by the invention is simple in preparation method, mild in operation condition and relatively high in repeatability, and shows excellent catalytic activity in an acid environment.

The application provides a metal oxide supported active metal catalyst, a preparation method and application thereof. The metal oxide supported active metal catalyst comprises a metal oxide carrier and active metal particles supported on the metal oxide carrier; the loading amount of the active metal is 0.1wt%-5wt% based on 100% of the mass of the metal oxide carrier. It is tested that the hydrogenation reaction of carbonates to prepare formate by using the metal oxide supported active metal catalyst provided by the application as a hydrogen source or using gaseous carbon monoxide with different concentrations and water to provide in-situ hydrogen source for the water gas shift reaction realizes the hydrogenation reaction of carbonates to prepare formate, the yield of the obtained formate is high, the selectivity is above 99%, there is no attenuation after 6 cycles, and the metal oxide supported active metal catalyst has excellent bifunctional effect. In addition, the preparation method of the metal oxide supported active metal catalyst is simple, the operation condition is mild, and the cost is low, so that large-scale production can be realized.

This invention discloses a method for preparing high-transparency tamarind polysaccharide gum through decolorization and deodorization. A combined purification process of enzymatic hydrolysis-sedimentation-chemical degradation-solvent washing-ultrafiltration is employed. Enzymatic hydrolysis degrades large molecules of proteins and fats in the extract into smaller molecules. Sodium hypochlorite is used for chemical degradation, oxidizing aldehydes and ketones in the extract into carboxylic acids. Finally, organic solvent washing and ultrafiltration purification remove impurities generated during enzymatic hydrolysis and chemical degradation, ultimately yielding high-transparency, odorless tamarind polysaccharide gum. The final product is white, with a transmittance of up to 95.4% at a 1% concentration, and is completely odorless, significantly improving product quality. This preparation process is simple, operates under mild conditions, and is suitable for industrial production.

The invention relates to the field of gas purification, and discloses a method for purifying natural gas, which comprises the following steps: (1) in the presence of a microbial agent, converting organic sulfur contained in crude natural gas into hydrogen sulfide and a first inorganic sulfur-containing solution in a first alkaline aqueous solution; (2) contacting the obtained hydrogen sulfide with a second alkaline aqueous solution to obtain a second inorganic sulfur-containing solution and purified natural gas; (3) mixing the first inorganic sulfur-containing solution and the second inorganic sulfur-containing solution, and purifying to obtain a purified barren solution; wherein the content of hydrogen sulfide in the crude natural gas is 2000-6000 mg / m < 3 >, the content of carbonyl sulfide is 70-300 mg / m < 3 >, and the content of methyl mercaptan is 25-110 mg / m < 3 >; the microbial agent comprises pseudomonas and / or rhodococcus. The process has relatively high treatment efficiency on natural gas with relatively high concentration of hydrogen sulfide and organic sulfur, hydrogen sulfide, carbonyl sulfide and methyl mercaptan.

The application provides a zwitterionic crosslinked ultrafiltration membrane with high antibacterial performance and a preparation method thereof, and belongs to the field of membrane separation technology.The zwitterionic crosslinked polymer ultrafiltration membrane with high antibacterial performance is prepared by using sodium p-aminobenzenesulfonate as an additive and a modifier, controlling the electrophilic substitution and crosslinking reaction between the sodium p-aminobenzenesulfonate and chloromethyl in a chloroalkyl functionalized polymer to control the crosslinking degree, and adopting a one-pot non-solvent induced phase inversion method.The application controls the thermodynamics of a casting solution through a chemical reaction, and then controls the polymer film forming kinetics, realizes the control of the morphology, microporous structure and performance of the polymer ultrafiltration membrane, endows the zwitterionic crosslinked ultrafiltration membrane with permanent hydrophilicity and antibacterial performance, and provides a new idea for preparing a polymer porous functional membrane.

The invention discloses a process for separating copper and nickel from secondary nickel return materials, and relates to the technical field of hydrometallurgy. The process comprises the following steps: adding the secondary nickel return materials to an alkali solution for alkali leaching, filtering to obtain an alkali leaching solution and an alkali leaching residue; adding the alkali leaching residue to an acid solution for acid leaching, filtering to obtain an acid leaching solution and an acid leaching residue; adding the alkali leaching solution to the acid leaching solution, stirring for reaction, filtering to obtain a filter residue and a neutralization solution; injecting the neutralization solution into an adsorption device, performing desorption after adsorption to obtain a copper ion desorption solution and a nickel ion desorption solution, and performing electrodeposition operations respectively to obtain copper metal and nickel metal. The invention adopts the technical route of alkali leaching-acid leaching-neutralization-adsorption separation, selectively dissolving copper by alkali leaching, dissolving nickel by acid leaching, regulating pH in the neutralization process to realize impurity separation, and finally performing graded adsorption of copper and nickel ions by using a modified adsorbent.

The invention relates to a process for synthesizing toluene diisocynate by a low-energy-consumption non-phosgene method, which comprises the following steps: reacting toluenediamine with dimethyl carbonate to synthesize toluene dicarbamate, and then decomposing the toluene dicarbamate to prepare the toluene diisocynate. According to the process, heat of a reaction product for synthesizing methyl toluenediamine and dimethyl carbonate is utilized, and part of light components are evaporated out through flash evaporation operation; and then adding a solvent for the decomposition reaction of toluene dicarbamate into the flashed material, continuously evaporating components such as dimethyl carbonate and the like, and enabling toluene dicarbamate and the solvent to enter a decomposition refining reaction tower together for reaction and separation to obtain a product. Compared with the prior art, the method has the advantages that the process is simple, the energy consumption, the equipment and the operation cost are saved, the purity of the obtained product and byproduct is high, and the total production cost of the toluene diisocyanate is greatly reduced.

The application discloses a kind of efficient flame-retardant lithium ion battery separator and preparation method thereof, belong to lithium ion battery separator technical field.The battery separator is coated by roll coating or spraying mode, ceramic slurry consisting of ceramic main material and halogen flame retardant, flame retardant additive, binder and other key additives is coated to the surface of base film, after vacuum drying, obtain the lithium ion battery separator with efficient flame retardancy and thermal stability.The application utilizes the synergistic effect of halogen flame retardant and flame retardant additive at high temperature, effectively captures burning free radicals and dilutes oxygen, realizes efficient flame retardancy;At the same time, the ceramic coating gives the separator excellent thermal stability.The separator can significantly improve the safety performance of lithium ion battery under abuse conditions, and the preparation process is simple and easy to industrial production.

According to the system and the method for separating the indane and the naphthalene from the mixture of the naphthalene and the indane, the mixture of the naphthalene and the indane is treated based on the system, and the indane product and the refined naphthalene product can be obtained through synchronous separation. The system comprises an impurity removal unit used for carrying out mixing, crystallization and solid-liquid separation on the mixture of naphthalene and indane and a solvent; the solvent removal unit is used for separating the solvent entrained in the impurity-removed mixture of naphthalene and indane; a solvent outlet of the solvent removal unit is connected with the impurity removal unit; the azeotropic rectification tower is used for carrying out azeotropic rectification on the mixture of the naphthalene and the indane without the solvent and an entrainer; and the naphthalene refining unit is used for carrying out water washing and phase separation on the mixed material of the naphthalene and the entrainer to obtain a light-phase component rich in naphthalene and a heavy-phase component containing water and the entrainer.

The invention relates to the technical field of food processing, in particular to a preparation method and application of sunflower seed protein. The preparation method comprises the following steps: mixing sunflower seed meal with an aqueous two-phase solvent, and then carrying out constant-temperature extraction, dialysis, alkali extraction and acid precipitation treatment; the aqueous two-phase solvent is a mixed solution of ammonium sulfate and an ethanol water solution. According to the preparation method, the content of chlorogenic acid in the sunflower seed meal can be reduced, the defect that browning is serious in the sunflower seed protein extraction process is overcome, the quality of the sunflower seed protein is improved, further application of the sunflower seed protein in the field of food processing is promoted, and therefore the economic value of bulk crops is increased.

The invention provides a compound for in-vivo detection of carboxylesterase 2, or a salt thereof, or a stereoisomer thereof, and a preparation method and application thereof, and belongs to the technical field of in-vivo luminescence detection of organisms. The invention provides a bioluminescent probe as shown in a formula I which is described in the specification. The probe is high in sensitivity, good in selectivity and suitable for accurate quantitative and qualitative analysis of carboxylesterase 2. Moreover, the preparation process is simple and convenient, the preparation cost is low, the operation condition is mild, the biocompatibility is good, the application prospect is wide, and the method is suitable for medical and biological research on carboxylesterase 2 detection in a living body. # imgabs0 #