26results about How to "Mild operating conditions" patented technology

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 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.

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 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 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 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.

The invention discloses heat-resistant glucose dehydrogenase and application thereof in an enzyme fuel cell, and belongs to the crossing field of bioelectrochemistry and new energy technologies. According to the invention, firstly, a heat-resistant glucose dehydrogenase TeGDH is screened, and the heat-resistant glucose dehydrogenase TeGDH is subjected to heterologous expression in escherichia coli BL21 (DE3) and shows good heat stability and catalytic activity; teGDH is dissolved in an anolyte containing an electron mediator anthraquinone-2, 6-disulfonic acid disodium salt, and the heat-resistant high-energy enzyme fuel cell is prepared by adopting a non-immobilized system; the maximum power density of the battery at 50 DEG C reaches 1.74 mW / cm, and the battery has good thermal stability and long-term operation performance; the invention combines big data mining, enzyme engineering and electrochemical technologies, provides a novel enzyme fuel cell solution with high activity, high stability and low cost, and has a good application prospect.

The invention relates to a method for reducing nitrate in waste water, and the method comprises the following steps: adding a first reducing agent into the waste water, and adjusting the pH value of the waste water to 6.5-7.5 to obtain waste water to be treated; carrying out contact catalytic reduction reaction on the wastewater to be treated and a catalyst; wherein the first reducing agent comprises oxysalt of sulfur; the catalyst comprises a carrier and an active component loaded on the carrier, the active component comprises an iron element and a noble metal element, and the noble metal element is one or more of ruthenium, palladium and tin. The method disclosed by the invention is simple and easy to implement, mild in operation condition, free of an oxygen-free environment and limitation of an over-high or over-low pH value, relatively high in tolerance to the content of organic matters in the wastewater and salinity, and high in removal rate of nitrate.

This invention relates to a method for controlling surface defects and phase states of indium oxide (IoA) using cold plasma. The production method primarily involves placing the IoA precursor, indium hydroxide, in a dielectric barrier discharge plasma reactor. Subsequently, a gas is introduced, and a high-voltage electric discharge is applied to break down the gas, generating plasma. The high-energy electrons in the plasma cause the indium hydroxide to decompose, forming IoA of different phase states, while simultaneously allowing oxygen atoms in the IoA lattice to escape, thus creating oxygen defects on the IoA surface. This method is simple to operate, operates under mild conditions, is quick, consumes little energy, and is environmentally friendly, showing promising application prospects in the field of materials science.

The invention discloses a method for preparing p-chlorobenzaldehyde through selective oxidation of p-chlorotoluene, which comprises the following steps: in a stirring type reaction kettle, taking p-chlorotoluene or a mixture of p-chlorotoluene and p-chlorobenzaldehyde as a liquid-phase raw material, taking a variable-valence metal complex as a main catalyst, and taking chloride and / or iodide as a cocatalyst; introducing oxygen-containing gas to carry out oxidation reaction; the height-diameter ratio of the stirring type reaction kettle is (5-8): 1, and a stirring paddle and a porous sintering gas distributor are arranged in the stirring type reaction kettle; and the difference between the height-diameter ratio of the stirring type reaction kettle and the layer number of the stirring paddles is 2. By optimizing the reactor and the catalytic system, the reactant conversion rate and the p-chlorobenzaldehyde selectivity can be improved, the reaction temperature is greatly reduced, and the use of bromide is avoided.

The application discloses a kind of composite lithium metal negative electrode material and preparation method thereof, it is related to electrochemical energy storage technical field, the method comprises: the three-dimensional porous carbon framework of pore size 50 to 500 nanometers is constructed, and 2 to 10 nanometer nitrogen-doped carbon layer is coated on its inner wall;Metal lithium is fused with lithium nitride to form lithium-rich melt;Capillary force is used to make molten lithium infiltrate into framework channel, in-situ generation and C-Li-N gradient interface phase;Lithium directional solidification is realized by programmed temperature cooling;Surface deposition 50 to 150 nanometer amorphous aluminum oxide passivation layer;Again, the final material is obtained by aging treatment.The application realizes lithium uniform loading, interface high ionic conductivity, structural integrity and high safety by the above technical scheme, significantly inhibits lithium dendrite growth, improves cycle stability and energy density consistency.

This invention provides a method for preparing germinated oat flakes based on a pretreatment with a medicinal and edible extract, comprising the following steps: S1, treating medicinal and edible components to obtain a medicinal and edible extract; S2, adjusting the pH of the medicinal and edible extract to 4.0-8.5, and adding cellulase to the extract to obtain an enzyme-containing extract; soaking washed oat grains in the enzyme-containing extract to obtain soaked oats; S3, germinating the soaked oats to a predetermined sprout length to obtain germinated oats; S4, steaming the germinated oats using steam generated from the medicinal and edible extract; S5, drying and pressing the steamed oats to obtain germinated oat flakes. The medicinal and edible components include plant materials containing polysaccharides and phenolic compounds.

The application belongs to the technical field of nanomaterials, and particularly relates to a hollow porous silica hydrophobic microsphere and a preparation method and application thereof. The preparation method comprises the following steps: mixing a hard template and anhydrous ethanol by ultrasonic dispersion to obtain a hard template dispersion liquid; adding the hard template dispersion liquid into a solvent to stir and adding ammonia water under the stirring state, then adding a soft template to continue stirring to obtain a mixed liquid; adding a hole expanding agent to the mixed liquid, then dropwise adding tetraethyl orthosilicate to continue stirring to carry out a reaction to obtain a product; performing centrifugation, washing, drying and calcination treatment on the product to obtain a calcined product; and performing water bath heating reaction on the calcined product and organosiloxane to obtain the hollow porous silica hydrophobic microsphere. The hollow porous silica hydrophobic microsphere has a simple preparation method, mild conditions, no toxicity and harmlessness, and common materials are used as raw materials, and the material can be used for water pollutant adsorption.

The invention provides a straw three-element separation method based on enzyme pretreatment and a DES solvent, belongs to the field of biomass resource utilization, and can solve the problems of high energy consumption, serious environmental pollution and low separation efficiency in the existing straw three-element separation method. Comprising the following steps: crushing straws, carrying out enzymolysis pretreatment by using cellulase and hemicellulase, mixing a solid obtained after solid-liquid separation with a DES solvent, and reacting for 2-4 hours under the conditions of 120-150 DEG C and 0.5-1.0 MPa to dissolve out lignin; centrifugally separating to obtain a DES solvent solution containing lignin and a solid precipitate containing cellulose and hemicellulose; filtering the DES solvent solution containing lignin through a ceramic membrane, and drying to obtain a lignin product; treating the solid precipitate with a hydrogen peroxide solution, carrying out solid-liquid separation, washing and drying to obtain a cellulose product; and combining the separation liquid and the washing liquid, concentrating, adding ethanol for precipitation, and drying to obtain a hemicellulose product. According to the invention, step-by-step efficient separation of three elements is realized, and the separation efficiency and the product purity are improved.

The invention relates to the technical field of coal chemical industry, and discloses a method for preparing lubricant base oil from Fischer-Tropsch hydrogenation tail oil. The method comprises the following steps: carrying out a first-stage reaction, a second-stage reaction and a third-stage reaction on the Fischer-Tropsch hydrogenation tail oil and hydrogen in sequence, and rectifying the reacted material, the first-stage reaction is carried out in the presence of a first hydroisomerization catalyst, and the second-stage reaction is carried out in the presence of a second hydroisomerization catalyst; the total acid amount of the first hydroisomerization catalyst is larger than that of the second hydroisomerization catalyst, and the specific surface area and pore volume of the first hydroisomerization catalyst are smaller than those of the second hydroisomerization catalyst; the temperature of the first-stage reaction is less than or equal to the temperature of the second-stage reaction, and the hydrogen partial pressure of the first-stage reaction is less than or equal to the hydrogen partial pressure of the second-stage reaction. According to the method, the Fischer-Tropsch hydrogenation tail oil full fraction can be applied, and it can be guaranteed that the prepared lubricating oil base oil has excellent quality.

The invention relates to the technical field of electrolytic aluminum solid waste resource utilization, in particular to a method for preparing aluminum fluoride from electrolyte lithium extraction tailings. The invention provides a method for synergistically recovering aluminum and fluorine resources in tailings generated after lithium extraction of an electrolytic aluminum lithium-rich electrolyte. The method comprises the following steps: firstly, leaching the lithium extraction tailings by adopting a hydrochloric acid-aluminum chloride system, so that aluminum and fluorine enter a solution in the form of a fluorine-aluminum complex to obtain a fluorine-aluminum solution; secondly, impurity removal treatment is conducted on the fluorine-aluminum solution, impurities such as silicon, iron, phosphorus and calcium are removed by regulating and controlling the pH value and adding a precipitator, and a purified solution is obtained; finally, hydrofluoric acid is supplemented into the purified liquid, and the anhydrous aluminum fluoride product with the high additional value is prepared through concentration, crystallization and calcination. The method is reasonable in process, efficient resource utilization of complex fluorine-containing and aluminum-containing solid waste is achieved, the aluminum and fluorine recovery rate is high, the product purity is high, and a new technical approach is provided for solving the electrolytic aluminum solid waste treatment problem and constructing a circular economy industrial chain.

The invention provides a purification method and a purification system for a long-chain alkyl mercaptan azeotrope, and belongs to the technical field of azeotrope separation and purification. According to the method, a Cu < 2 + > modified MFI type molecular sieve is used as an adsorbent and is filled in a fixed bed adsorption tower. In the adsorption step, straight-chain alkyl mercaptan can enter a molecular sieve pore channel and is adsorbed by Cu < 2 + > specific complexation, and branched-chain alkyl mercaptan is not adsorbed due to steric hindrance, so that a material rich in branched-chain alkyl mercaptan is obtained; in the regeneration step, a thermal medium is introduced for desorption and recovery of high-purity linear alkyl mercaptan; and in the cooling step, inert gas is introduced to recover the adsorption tower to the adsorption preparation state. By utilizing the synergistic effect of double mechanisms of size screening and chemical complexing, efficient and continuous separation can be realized at normal temperature and normal pressure, the purity of the straight-chain alkyl mercaptan product is not lower than 99.5%, and the method has the advantages of low energy consumption, stable operation and high product yield.

The application provides an alumina-carbon double-layer coated silicon composite material and a preparation method and application thereof, and relates to the technical field of lithium ion battery negative electrode materials.The application provides an alumina-carbon double-layer coated silicon composite material, which comprises nanosilicon, an amorphous carbon layer coated on the surface of the nanosilicon, and an alumina layer coated on the surface of the amorphous carbon layer.Through the double-layer coating of the carbon layer and the alumina layer, the problems of volume expansion of the silicon negative electrode, poor conductivity and instability of the SEI film are solved, the electrochemical reaction activity of the battery is increased, and the long cycle stability of the negative electrode material is significantly improved.The data of the embodiment show that the alumina-carbon double-layer coated silicon composite negative electrode material prepared by the application has a first circle discharge specific capacity of 2251.45 mAh / g at 0.1 C, and the reversible discharge specific capacity can reach 719.23 mAh / g after 1000 cycles at 0.5 C.

The present application belongs to the technical field of solvent extraction, and particularly relates to a method for separating cyclohexanone wastewater. The separation method comprises the following steps: taking n-propyl acetate as an extractant, feeding the cyclohexanone wastewater into an extraction tower for extraction, and obtaining an extraction phase rich in cyclohexanone and the extractant; the extraction phase enters an extractant recovery tower for rectification and separation, the recovered n-propyl acetate is obtained at the top of the tower, and cyclohexanone is obtained at the bottom of the tower. By selecting n-propyl acetate as the extractant, the present application can effectively break the azeotropy of cyclohexanone and water, realize efficient separation, and the recovery rate of cyclohexanone can reach more than 99.18%, and the purity is more than 99.99%. The process flow of the present application is simple, the operation conditions are mild, and the extractant can be recycled, so that the present application has good economic efficiency and environmental protection. The present application can be used for treating wastewater and recycling and purifying cyclohexanone in the production process of cyclohexanone.

This invention discloses a method for multi-stage treatment of copper-containing wastewater based on graphene oxide-assisted electric field-driven process. The method utilizes a graphene oxide-assisted N / O / S multi-coordinated copper ion-imprinted cation exchange membrane as the selective separation interface, employs a membrane arrangement of graphene oxide-assisted copper ion-imprinted cation exchange membrane—anion exchange membrane—cation exchange membrane, and utilizes an electric field for migration and release, with endogenous carbonate as the circulating crystallization medium in a continuous treatment system. This system can synergistically achieve the decomposition and transformation of complexed copper, and the treatment of Cu... 2+ Selective migration and enrichment, polarity reversal release, and in-situ crystallization recovery form "complex copper transformation-Cu". 2+ A closed-loop treatment pathway of "selective enrichment at the membrane interface – reverse release – internal carbonate recycling and crystallization recovery" is employed. This technology can reduce the consumption of external precipitants, lower the post-treatment pressure of copper-containing concentrate, and increase the value of copper resource recovery, providing strong support for the in-depth treatment and resource utilization of wastewater containing complexed copper.

The application relates to the technical field of drilling fluid treating agents, and discloses a high-temperature-resistant sulfonated asphalt for drilling fluid and a preparation method thereof, the preparation method being as follows: asphalt is crushed, melted at 140-160 DEG C, then cooled to 120-130 DEG C, fuming sulfuric acid is added dropwise, after the dropwise addition is completed, stirring reaction is carried out for 2-3 h, the temperature is continuously lowered to 90-100 DEG C, deionized water is added, a sodium hydroxide solution with a mass fraction of 20% is used to adjust the pH of the system to 8-9, then sulfobetaine type zwitterions and modified nano silicon dioxide are added into the system, high-speed stirring is carried out at 1000-1500 rpm for 30-60 min, drying is carried out, crushing is carried out, and the high-temperature-resistant sulfonated asphalt for drilling fluid is obtained. The high-temperature-resistant sulfonated asphalt for drilling fluid prepared by the application has good high-temperature resistance and shale inhibition performance.

The present application relates to the technical field of organic tail gas treatment, and specifically discloses an absorbent for low-boiling-point alkane alkene tail gas and an absorption process. The absorbent for low-boiling-point alkane alkene tail gas is prepared from the following components by mass percentage: water 50-70%, oxygen-containing organic matter 30-50%, wherein the oxygen-containing organic matter comprises methanol, ethanol and acetone. The present application is aimed at the problem of low efficiency and high treatment cost in the existing treatment method for low-boiling-point alkane alkene tail gas. The water solution of oxygen-containing organic matter (methanol, ethanol and acetone) is used to absorb and treat ethylene, propylene, ethane and / or propane tail gas. The absorbent can be recycled and regenerated. The present application uses cheap and readily available water, methanol, ethanol and acetone as the absorbent, and has the advantages of simple operation, low treatment cost and being particularly suitable for the enrichment and concentration of low-boiling-point organic waste gas such as ethylene and propylene.

The invention provides preparation and application of a novel guar gum / inorganic salt aqueous two-phase system, the aqueous two-phase system comprises guar gum, inorganic salt and water, the mass fraction of the guar gum is 0.01%-3%, the mass fraction of the inorganic salt solution is 0.01%-40%, and the pH of the system is adjusted from 1 to 12 by using 1M HCl and NaOH to promote formation of an aqueous two-phase structure. The aqueous two-phase system is applied to the technical field of protein separation, and is particularly used for separating alpha-whey protein (alpha-La) and beta-lactoglobulin (beta-Lg) in milk whey protein. After separation, determining the protein concentration by adopting a biuret method, and identifying and detecting through SDS-PAGE (Sodium Dodecyl Sulfate-Polyacrylamide Gel Electrophoresis). The method provided by the invention has the advantages of low cost, mild conditions, simplicity and convenience in operation and the like, and the used raw material guar gum is a natural source and has good biocompatibility and safety.

The application relates to the technical field of drilling fluid treating agents, and discloses a high-temperature-resistant sulfonated asphalt for drilling fluid and a preparation method thereof, the preparation method being as follows: asphalt is crushed, melted at 140-160 DEG C, then cooled to 120-130 DEG C, fuming sulfuric acid is added dropwise, after the dropwise addition is completed, stirring reaction is carried out for 2-3 h, the temperature is continuously lowered to 90-100 DEG C, deionized water is added, a sodium hydroxide solution with a mass fraction of 20% is used to adjust the pH of the system to 8-9, then sulfobetaine type zwitterions and modified nano silicon dioxide are added into the system, high-speed stirring is carried out at 1000-1500 rpm for 30-60 min, drying is carried out, crushing is carried out, and the high-temperature-resistant sulfonated asphalt for drilling fluid is obtained. The high-temperature-resistant sulfonated asphalt for drilling fluid prepared by the application has good high-temperature resistance and shale inhibition performance.