43 results about "Alkaline hydrolysis" patented technology

The present application relates to a kind of high efficiency energy-saving preparation process of phloroglucinol.The preparation process uses phenol as raw material, generates 2,6-dichlorophenol and dichlorophenol isomer through chlorination reaction, then is alkaline hydrolysis and acidification into product phloroglucinol, after the intermediate dichlorophenol is generated in the chlorination reaction of raw material phenol, it is not concentrated and separated, directly add base to carry out alkaline hydrolysis reaction, realize chlorination-alkaline hydrolysis two-step reaction continuous production.The present application uses alkaline hydrolysis reaction to also convert the original dichlorophenol isomer impurity in situ into product phloroglucinol, realizes waste to treasure, improves yield about 8-10%;In the preparation process, 2,6-dichlorophenol intermediate is not separated, it is directly used in the next step alkaline hydrolysis reaction, the operation unit such as the solvent, crystallization, centrifugation, drying, packaging etc. for its concentration replacement is saved, at the same time, the pungent odor generated in the large production process of 2,6-dichlorophenol is fundamentally avoided, and the environmental pollution problem in the production process of phloroglucinol is avoided.

This invention discloses a phenylnaphthic acid derivative and its application in phosphorescent information encryption. The preparation method involves using 3,5-bis(ethoxycarbonyl)phenylboronic acid and methyl 6-bromo-2-naphthylcarboxylate as raw materials, and then performing a Suzuki coupling reaction under tetra(triphenylphosphine)palladium(O) catalysis to obtain the intermediate ethyl 2-(3,5-bis(ethoxycarbonyl)phenyl)-6-naphthylcarboxylate. This intermediate is then subjected to alkaline hydrolysis and acidification to obtain the target product, 2-(3,5-dicarboxyphenyl)-6-naphthylcarboxylic acid. This phosphorescent material has a simple preparation method, lower cost compared to noble metal phosphorescence systems, a simple guest synthesis method with high yield, and exhibits significant and stable phosphorescence effects. Furthermore, precise emission color control of high-performance doped thin films is achieved through the triplet-to-singlet Förster fluorescence resonance energy transfer (TS-FRET) mechanism, establishing a multicolor long-lifetime emission system. In addition, the material has multi-color adjustable properties and excellent long afterglow emission performance, showing great application potential in cutting-edge application fields such as multi-dimensional information encryption and high-end anti-counterfeiting.

A method for preparing 1,2-pentanediol and co-producing 2,3-epoxypentane, 2,3-epoxy-2-methylbutane, and 1,2-epoxy-2-methylbutane involves using the residual C5 from cracked ethylene as the reactant, an organic peroxide as the oxidant, and a titanium-silicon molecular sieve as the catalyst to undergo a catalytic oxidation reaction. The resulting reaction products are then separated by distillation. The residual C5 component is collected at the top of a first distillation column, and the bottom product is transferred to a second distillation column. Epoxyalkane is collected at the top of the second distillation column. The collected epoxyalkane is transferred to a third distillation column, where 1,2-epoxy-2-methylbutane and 2,3-epoxy-2-methylbutane are collected at the top, and 2,3-epoxypentane and 1,2-epoxypentane are collected at the bottom. The bottom product of the third distillation column is then subjected to an alkaline hydrolysis reaction. The mixture obtained from the alkaline hydrolysis reaction is further distilled to separate 1,2-pentanediol and 2,3-epoxypentane. This invention provides a green and environmentally friendly method for the high-value utilization of C5 residue from cracked ethylene.

This invention provides an extract of *Hedyotis diffusa*, its preparation method, and its uses. When the extract is measured under reversed-phase high-performance liquid chromatography, the peak area A of 6''-malonyl *Hedyotis diffusa* I is... M Peak area A with cypermethrin I B The ratio is less than 0.1, and the peak area A of free kaempferol is... K With A B The ratio shall not exceed 0.15. The preparation method includes: adjusting the pH of the aqueous extract of *Kaempferia galanga* to 11-13.5, and performing alkaline hydrolysis at 25-65°C for 20-60 minutes. This invention utilizes the difference in stability of malonyl bonds and glycosidic bonds under alkaline conditions to achieve the selective conversion of 6''-malonylkaempferol I to kaempferol I, increasing the content of kaempferol I while maintaining the integrity of the glycosidic bonds and inhibiting or controlling the formation of free kaempferol. The resulting extract can be used to prepare anti-inflammatory and antioxidant drugs or health foods.

The application discloses a mineralization treatment method of organic waste liquid, and belongs to the technical field of radioactive waste treatment. The organic waste liquid contains uranium, tributyl phosphate and diluent. The mineralization treatment method comprises the following steps: the organic waste liquid is separated through short-path molecular rectification to obtain a diluent fraction and a tributyl phosphate fraction; the tributyl phosphate fraction is reacted with alkali liquor to generate an alkaline hydrolysis product containing dibutyl phosphate salt, n-butanol, water and uranium; the n-butanol is collected through condensation reflux; and the remaining alkaline hydrolysis product is treated through two-stage oxygen-controlled incineration, so that phosphate glass and qualified flue gas are finally obtained. The mineralization treatment method has the advantages of no corrosion, short process, high-efficiency mineralization and stabilization of the waste liquid, direct disposal of the product, consideration of resource recovery and radioactive safety, and easy industrialization.

The application discloses a kind of 3-(cholic acid pentanoyl amide) cyclobutane-1,1-dicarboxylic acid purification method, belong to the technical field of pharmaceutical chemistry intermediate purification.The method includes: (1) its precursor diethyl ester is hydrolyzed in methanol and / or acetonitrile, concentrated after dissolving with water, with organic solvent extraction is discarded organic phase, water phase is adjusted to 2-4 to pH, again with organic solvent extraction, concentrated and obtained crude product;(2) the crude product is dissolved in alcohol solvent, after filtration, ester solvent is added to crystallize, alcohol ester volume ratio 1:2-1:10, filtration, washing, drying.The application removes unreacted ester, monocarboxylic acid byproduct and cholic acid analogue amide and other impurities by alkaline hydrolysis combined with "alkali dissolving acid extracting" and "alcohol dissolving-ester crystallizing" recrystallization.The product obtained by the method has HPLC purity ≥98.2%, yield ≥80%, and the process is stable, simple to operate, suitable for large-scale production.

The application provides a preparation method and application of bovine collagen peptide, and belongs to the technical field of collagen peptide; the preparation method comprises the steps of freeze-thaw-microwave treatment, alkaline hydrolysis, enzyme hydrolysis 1, enzyme hydrolysis 2, enzyme hydrolysis 3, enzyme hydrolysis 4 and antiseptic filtration; in the freeze-thaw-microwave treatment step, bovine skin powder is added into a mixed solution, stirred uniformly, and then soaked for 15-20 min; the mixed solution is placed in a sealed container for freeze-thaw treatment, frozen at-24 to-20 DEG C for 5-6 h, naturally thawed, and then the freeze-thaw treatment is repeated for 1-2 times; the water content is controlled to be 50-52 wt %, and wet material is obtained; the wet material is placed into a microwave device for microwave treatment, and the temperature of the wet material is controlled to be lower than 55 DEG C, so that freeze-thaw-microwave treated bovine skin powder is obtained; the product obtained by the method has high polypeptide content, and when the product is applied to soybeans, potatoes and lettuce, the yield and quality can be effectively improved.

A separator for alkaline hydrolysis comprising a porous layer, the porous layer comprising inorganic particles, characterized in that the inorganic particles have a fraction of primary particles having a diameter above 100 nm of lower than 3% by number, as measured by Transmission Electron Microscopy (TEM).

This invention discloses a method for efficiently extracting and enriching sludge-based antimicrobial peptides from activated sludge, belonging to the field of activated sludge resource recycling and utilization. The invention removes impurities from the activated sludge by releasing intracellular and extracellular proteins through low-temperature hot alkaline hydrolysis, followed by enzymatic hydrolysis with proteases to obtain a crude extract containing peptides of different molecular weights. Further purification involves primary purification to remove impurities and secondary purification to separate amino acids and peptides from the organic matter mixture, yielding purified antimicrobial peptide products of different molecular weights. Antimicrobial activity is assessed using an inhibition zone assay, resulting in a highly effective antimicrobial sludge-based antimicrobial peptide molecular template. This template is used to prepare a magnetic molecularly imprinted polymer (Fe3O4@MIPs). Fe3O4@MIPs are then used to adsorb and enrich the highly effective antimicrobial sludge-based antimicrobial peptides in the crude extract. After elution with an eluent, highly effective antimicrobial sludge-based antimicrobial peptides are obtained.

The present invention relates to a method for obtaining slurry from mussels and / or mussel culture waste products. It makes it possible to reduce the waste produced in the cultivation of Black Sea mussels. The liquefaction method used is a sequence of four steps involving acid and alkaline dissolution carried out at room temperature and atmospheric pressure. The first stage involves dissolving the shell and calcareous deposits with concentrated nitric acid. The second stage involves separating the undissolved mass from the solution obtained in the first stage. The third step comprises alkaline hydrolysis of the undissolved mass separated in the second step using potassium hydroxide. The fourth stage comprises mixing and neutralizing the solutions obtained from the first and second stages, followed by adjusting the pH of the final product in the range 6,4-6,8.

This application relates to the technical field of surfactants, and in particular to a low-foaming emulsifier based on disproportionated rosin-polyetheramine amide, its preparation method, and its application; a method for preparing a low-foaming emulsifier based on disproportionated rosin-polyetheramine amide includes the following steps: reacting disproportionated rosin with thionyl chloride under the action of catalyst 1, then adding polyetheramine for further reaction, followed by alkali washing and separation to obtain a disproportionated rosin-polyetheramine amide intermediate; using the disproportionated rosin-polyetheramine amide intermediate as an initiator, reacting it with ethylene oxide under the action of catalyst 2 to obtain a low-foaming emulsifier; this application discloses a low-foaming emulsifier based on disproportionated rosin-polyetheramine amide, its preparation method, and its application. The prepared low-foaming emulsifier achieves three major functions: low foaming, good resistance to alkali hydrolysis, and good lubrication performance, simplifying the formulation structure and improving system compatibility and stability.

The present application relates to the technical field of chemical wastewater, and discloses a pretreatment method of chemical wastewater, which solves the problems of high treatment cost, low organic matter removal rate and poor resource utilization rate of the existing production wastewater treatment of o-aminobenzoic acid, methyl o-aminobenzoate and sodium saccharin. The method first pretreats the salt components of the wastewater to eliminate the interference of inorganic salts on the subsequent reaction, then carries out hydrolysis / alkaline hydrolysis treatment, then carries out diazotization-coupling reaction to convert the o-aminobenzoic acid components into high-value-added 2-((5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)diazenyl)benzoic acid byproducts, and finally recovers crude o-phthalic acid by cooling and precipitation. The utilization rate of the o-aminobenzoic acid components in the wastewater reaches more than 99.9%, and the method has the advantages of low treatment cost, low equipment investment, short process flow, high resource utilization efficiency and complete wastewater treatment.

The present application relates to the technical field of fertilizer, in particular to a general water-soluble fertilizer for agricultural planting and a preparation method thereof.The fertilizer is composed of a modified polyaspartic acid salt additive, a macroelement fertilizer and a trace element fertilizer.The additive is obtained by alkaline hydrolysis after the reaction of polysuccinimide with 3-amino-1,2-propanediol, boric acid, sodium tetraborate decahydrate and potassium taurate in sequence.The process of first preparing a pre-dispersion of the additive and trace elements and then mixing with macroelements can improve the solubility stability of the fertilizer in high-hardness water and increase the soluble retention rate of iron and zinc, and is suitable for integrated water and fertilizer application.

This invention discloses a novel method for preparing and applying protonated layered iridium oxide (H-IrO2) nanosheets. The iridium oxide nanosheets possess a typical layered structure, with a large number of protons accommodating the interlayer spaces. The in-plane layers exhibit abundant metallic iridium vacancy defects and localized disorder. The preparation method includes: 1) alkaline hydrolysis of an iridium metal salt to obtain an amorphous iridium oxide precursor; 2) Joule heating treatment to obtain the layered iridium oxide nanosheet structure; and 3) acidic proton exchange to obtain protonated layered iridium oxide nanosheets. This novel layered structure exhibits high activity and excellent stability in the anodic oxygen evolution reaction of acidic water electrolysis. Its unique structure and superior performance make it a promising alternative to existing commercial catalysts, playing a crucial role in large-scale water electrolysis.

The application discloses a preparation method of high monodisperse micron-sized silica microspheres, the microspheres and a chip, wherein the preparation method comprises the following steps: S1, uniformly mixing an organic solvent, an alkaline catalyst, ultrapure water and a stabilizer to obtain an alkaline hydrolysis solution; S2, dispersing a certain mass of a silicon source monomer in the organic solvent to form a monomer solvent; S3, under stirring, adding the monomer solvent into the alkaline hydrolysis solution at a preset constant flow rate for two times, adding inorganic salt and stirring uniformly in the interval time of adding the monomer solvent for two times; obtaining a silica dispersion liquid after reaction and aging; and S4, performing centrifugation, washing and freeze-drying treatment on the silica dispersion liquid to obtain micron-sized silica microspheres. The scheme effectively increases the particle size of the silica microspheres to the micron level, guarantees the sphericity and particle size uniformity of the microspheres, is good in reproducibility in the preparation process and is easy to mass-produce, and the application of the scheme to solid-phase chip point preparation is excellent, so that the customization site conversion rate is improved.

This application discloses a method and apparatus for producing bio-based pentanediamine. The method includes: using pentanediamine fermentation broth and / or its treated broth as raw materials, decarbonizing the raw materials to obtain a decarbonized liquid, then subjecting the decarbonized liquid to alkaline hydrolysis to obtain an alkaline hydrolysate; extracting the alkaline hydrolysate using an extractant and an auxiliary agent, collecting the oil phase to obtain an extract; removing light components from the extract, then separating pentanediamine and the extractant by distillation to obtain high-purity pentanediamine; and passing the raffinate through a crystallization evaporation system to obtain crystalline salt and organic fertilizer. This application enables the continuous industrial production of pentanediamine. Extraction with a multi-component extractant and auxiliary agent transfers pentanediamine to the oil phase, and controls emulsification and entrainment in the oil phase, preventing salt from entering the oil phase and avoiding salt precipitation during subsequent refining processes that could cause equipment and pipeline blockage. High-purity pentanediamine is obtained by distillation of the oil phase, avoiding the enormous energy consumption of traditional water concentration methods.

This application provides an LCP thin film assembly, its preparation method, and its application. The preparation method includes: surface modification of the LCP thin film to obtain an activated surface rich in carboxyl and hydroxyl groups, followed by hot pressing of the LCP thin film with the activated surface; the LCP thin film assembly includes a multilayer LCP thin film bonded by hot pressing, wherein no adhesive is contained between any two adjacent LCP thin films, and the interface region between any two adjacent LCP thin films forms a homogenized molecular-level bonding layer through melt recrystallization; the preparation method of this application introduces active functional groups through surface modification methods such as alkaline hydrolysis and acid activation, achieving interlayer chemical bonding during hot pressing, significantly improving interlayer bonding strength, avoiding the risks of bubbling and delamination, and retaining the inherent excellent high-frequency performance and dielectric properties of the LCP thin film; this preparation method, when applied to the preparation of LCP thin film probe cards, can produce thin film probe cards with excellent interlayer bonding strength and high-frequency performance.

The application discloses a preparation method of high monodisperse micron-sized silica microspheres, the microspheres and a chip, wherein the preparation method comprises the following steps: S1, uniformly mixing an organic solvent, an alkaline catalyst, ultrapure water and a stabilizer to obtain an alkaline hydrolysis solution; S2, dispersing a certain mass of a silicon source monomer in the organic solvent to form a monomer solvent; S3, under stirring, adding the monomer solvent into the alkaline hydrolysis solution at a preset constant flow rate for two times, adding inorganic salt and stirring uniformly in the interval time of adding the monomer solvent for two times; obtaining a silica dispersion liquid after reaction and aging; and S4, performing centrifugation, washing and freeze-drying treatment on the silica dispersion liquid to obtain micron-sized silica microspheres. The scheme effectively increases the particle size of the silica microspheres to the micron level, guarantees the sphericity and particle size uniformity of the microspheres, is good in reproducibility in the preparation process and is easy to mass-produce, and the application of the scheme to solid-phase chip point preparation is excellent, so that the customization site conversion rate is improved.

This invention belongs to the field of organic synthesis technology, specifically relating to a method for synthesizing a carboxyl-containing adamantane methacrylate resin monomer. The synthesis method includes the following steps: S1: 3-hydroxyadamantane-1-carboxylic acid is reacted with concentrated sulfuric acid and a primary alcohol to obtain methyl 3-hydroxyadamantane-1-carboxylic acid; S2: methyl 3-hydroxyadamantane-1-carboxylic acid is esterified in a reaction containing methacryloyl chloride, triethylamine, and dichloromethane to generate methyl 3-methacrylate-adamantane-1-carboxylic acid; S3: methyl 3-methacrylate-adamantane-1-carboxylic acid is subjected to an alkaline hydrolysis reaction in a reaction containing methacryloyl chloride, alkaline solution, water, and a secondary alcohol to obtain a carboxyl-containing adamantane methacrylate resin monomer. This invention solves the technical problems of low esterification conversion rate, large raw material residue, and easy polymerization of the product due to the presence of carboxyl groups in the resin monomer, making industrial-scale production impossible.

The application provides a goat complete mixed pellet feed containing coffee peel and application thereof, and the feed comprises the following raw materials in parts by weight: coffee peel 15-30 parts, corn 20-35 parts, soybean meal 10-20 parts, bran 5-15 parts, palm meal 1-3 parts, baking soda 1-2 parts, mineral premix 1-3 parts, vitamin premix 0.5-1.5 parts, compound probiotic preparation 0.1-0.5 parts and compound enzyme preparation 0.05-0.2 parts. The coffee peel is treated by an alkaline hydrolysis-solid state fermentation compound removal process, so that the problem of the influence of the anti-nutritional factors of the coffee peel on the feeding effect is effectively solved; through optimization of the formula, the multiple components are synergistically enhanced, and through adoption of a specific process, the problems of difficult granulation and molding of the feed after the addition of the coffee peel and loss of nutrients are solved. The feed is used for goat fattening breeding, can improve the daily weight gain of the fattening goats, reduces the feed-meat ratio, improves the intramuscular fat content of the mutton and improves the flavor of the mutton.

A strain of Lactobacillus putrefaction ( Loigolactobacillus coryniformis ZS-07 and its application in the fermentation preparation of rare ginsenosides belong to the field of microbial fermentation. This rod-shaped Lactobacillus putrefactive ( Loigolactobacillus coryniformis ZS-07 was deposited at the China Center for Type Culture Collection on January 4, 2026, with accession number CCTCC NO: M 2026009. This invention uses ginsenoside Rb1 as a raw material and utilizes *Lactobacillus putrefactiveus* (…). Loigolactobacillus coryniformis The ZS-07 fermentation process was used to prepare rare ginsenosides 20(S)-Rg3, 20(R)-Rg3, Rk1, and Rg5. After fermentation, ginsenoside Rb1 can be converted into 20(S)-Rg3, 20(R)-Rg3, Rk1, and Rg5. Unlike conventional methods that rely on alkaline hydrolysis, high temperature and high pressure, or steam treatment, this invention's process exhibits excellent mildness, environmental friendliness, and low cost advantages, and can effectively increase the content of the conversion products. This invention provides a new strategy for the targeted synthesis of rare ginsenosides 20(S)-Rg3, 20(R)-Rg3, Rk1, and Rg5, thereby broadening their application prospects and industrialization potential.

This invention relates to a method for producing benzyl alcohol and co-producing benzyltoluene by hydrolysis of benzyl chloride, belonging to the field of chemical raw material preparation technology. It includes a micro-interface circulating reactor and a multi-stage extraction centrifuge. The bottom of the micro-interface circulating reactor is connected to the reaction liquid inlet of the multi-stage extraction centrifuge via a reaction liquid metering pump. The top of the micro-interface circulating reactor has a gas phase inlet and a condensate reflux inlet connected to the condenser body. The aqueous phase outlet of the multi-stage extraction centrifuge is connected to the buffer tank body. The bottom of the buffer tank is connected to the top inlet of the micro-interface circulating reactor via a mixing pump and a mixer. The organic phase outlet of the multi-stage extraction centrifuge is connected to the light phase removal tower body. The top of the light phase removal tower is connected to the micro-interface circulating reactor via a Venturi mixer. This process has low reaction temperature and pressure, significantly reduces by-product generation, and significantly lowers energy consumption and production costs. Simultaneously, the process produces hydrochloric acid as a by-product, making it a preferred green upgrade solution for traditional alkaline hydrolysis processes.

This invention provides a method for treating HDI distillation vessel residue and a hexamethylenediamine product. The method includes: Step S1, performing a first decoking process on the HDI distillation vessel residue to obtain a decoked product and a decoked vessel residue; Step S2, subjecting the decoked product to molecular distillation to obtain recovered HDI and molecularly distilled heavy components; Step S3, mixing the molecularly distilled heavy components and the decoked vessel residue with an alkaline solution for alkaline hydrolysis, and purifying the reaction solution to obtain hexamethylenediamine. This application achieves efficient recovery of HDI from HDI distillation vessel residue through decoking and molecular distillation, reducing the amount of residue to be processed while recovering the effective components, thus saving costs. Furthermore, through alkaline hydrolysis, hexamethylenediamine hydrochloride, urea isocyanate, and HDI polymers in the HDI distillation vessel residue are converted into hexamethylenediamine, resulting in a simpler composition, reducing the difficulty of post-processing. The product, hexamethylenediamine, can be used as a raw material for HDI synthesis, resulting in high economic added value.

The disclosure is directed at a method of treating hard to digest food waste by treating the food waste with a thermal-alkaline hydrolysis process (THP). The THP includes treating the food waste with heat, alkali, and shear for a preselected time to produce a biodegradable feedstock for improved anaerobic digestion.

A method of solvent reuse during the alkaline hydrolysis of polyethylene terephthalate (PET) into terephthalic acid (TPA) and ethylene glycol (EG) is described, the method comprising in the following order the steps of: a) contacting PET with a catalyst in a virgin solution comprising at least one solvent in the presence of a base to provide a first reaction mixture containing a first solid phase and a first liquid phase; b) separating the first liquid phase comprising ethylene glycol, the at least one solvent and the base from the first solid phase of the first reaction mixture; c) recovering the first liquid phase to receive a first recovered solution comprising ethylene glycol; d) contacting PET with a catalyst in a second solution comprising at least one solvent in the presence of a base to provide a second reaction mixture containing a second solid phase and a second liquid phase, wherein the second solution comprises the first recovered solution; e) separating the second liquid phase comprising ethylene glycol, the at least one solvent and the base from the second solid phase of the second reaction mixture; f) recovering the second liquid phase to receive a second recovered solution comprising ethylene glycol.

This invention belongs to the field of functional membrane materials and semiconductor chemical purification technology, and relates to a functionalized fiber membrane for removing metal ions from solution, its preparation method, and its application. The preparation method includes: preparing a polyacrylonitrile nanofiber membrane by electrospinning; immersing the prepared polyacrylonitrile nanofiber membrane in an alkaline hydrolysis system for surface chemical modification; after the reaction is complete, washing and drying the fiber membrane to obtain the functionalized fiber membrane for removing metal ions from solution. The functionalized fiber membrane prepared by this invention has a stable overall structure and can maintain good chemical stability and mechanical integrity in organic solvents and complex chemical environments, reducing the loss of functional components and the risk of secondary pollution. Compared with traditional particulate ion exchange resins, the fiber membrane of this invention has significant advantages in adsorption kinetics, equipment integration, and operational reliability, and is of great significance for improving the performance and yield of semiconductor devices.

The present application belongs to the technical field of wastewater treatment, and particularly relates to a purification treatment process for pyrazolone production wastewater. The present application, in view of the characteristics of high COD, high total nitrogen, high salt and difficult biodegradation of the pyrazolone production wastewater, constructs a whole-process collaborative process of targeted pretreatment-resource recovery-mild detoxification-depth purification, efficiently recovers acetonitrile through composite extraction and pervaporation membrane separation, catalyzes alkaline hydrolysis through a magnesium-aluminum composite catalyst, mildly degrades heterocyclic compounds through ring-opening, and improves biodegradability. Photocatalysis and Fenton-like are combined to continuously generate hydroxyl radicals, deeply oxidize and mineralize refractory organic matter, modify the biological carbon to adsorb residual small molecules and chroma, and reduce the residual metal ion and secondary pollution risk. The oxidation-adsorption coupling strategy combines the strong degradation ability of advanced oxidation and the adsorption purification function of biological carbon, realizes the beneficial improvement of treatment efficiency, ensures that the wastewater meets the discharge standard, recovers resources to reduce costs, and has both environmental and economic benefits.

This invention discloses a method for synthesizing alumina-rich Beta molecular sieves by transcrystalline transformation of A molecular sieves. The method includes adding pretreated A molecular sieves to an alkaline solution for alkaline hydrolysis, directional assembly onto the surface of Beta seed crystals, adding a template agent and supplementing with a silicon source for crystallization to obtain a pure-phase, highly crystalline alumina-rich Beta molecular sieve. Furthermore, a long-chain alkyl quaternary ammonium salt alcohol solution is added to the crystallized product for further crystallization to obtain a hierarchical porous alumina-rich Beta molecular sieve. This invention utilizes inexpensive and readily available A molecular sieves for transcrystalline transformation into alumina-rich hierarchical porous Beta with a silicon-to-aluminum ratio of 5-10; the template agent molar amount is low, significantly reducing cost and pollution; seed crystal induction results in high crystallinity, few impurities, and high transformation efficiency; in-situ pore expansion with long-chain quaternary ammonium salts forms hierarchical channels; it combines high acid density with excellent mass transfer performance; the process is simple, low-cost, and suitable for industrialization; and it exhibits excellent catalytic performance in the reaction of benzoylbenzoic acid compounds to anthraquinone compounds.

The application discloses an anti-floating anchor rod and waterproof layer integrated construction method, and belongs to the technical field of underground engineering rock soil anchoring; in view of the pain points that the anti-corrosion coating is easily scratched during construction, the free section isolation layer forms a permanent weak interface, and the traditional degradable material is unreliable in microbial degradation, the application coats the anchor rod with an anti-corrosion primer, and only in the free section, a hydrolyzable degradable fiber braided sleeve bag filled with buffer dry powder is worn, and the anchoring section is directly grouted. The sleeve bag is made of polyglycolic acid and poly (lactic acid-co-glycolic acid) blended fiber, the dry powder contains river sand, fly ash, a small amount of cement and an alkaline hydrolysis accelerator, and the controllable hydrolysis of 12-24 months is realized through internal and external double-alkali triggering; the application buffers and protects the coating during construction, forms a non-Newtonian fluid to absorb energy and reduce vibration during use, completely eliminates the organic interface after degradation, the anchoring section is not affected by the uplift capacity, the free section realizes long-acting waterproof and corrosion protection, the comprehensive cost is low, the construction is simple, and the application meets the current specification requirements.

A method for preparing high-purity potassium fluoride by stepwise alkaline hydrolysis of potassium fluosilicate, which comprises: preparing a slurry by adding water to potassium fluosilicate with a K2SiF6 content of 99.0 wt.%; heating to 85-95 DEG C; rapidly adding potassium hydroxide to rapidly increase the pH of the reaction system to 12.0-14.0; stopping the addition of potassium hydroxide after the potassium fluosilicate is completely hydrolyzed; continuing the reaction under stirring until the pH falls to 10.0-10.5, white precipitate appears in the system; continuing the reaction until the pH falls to 9.0-9.5; adding potassium hydroxide to adjust the pH to 9.5-10.0; continuing the reaction until the hydrolysis reaction is completed; filtering the slurry to obtain a clear filtrate; adding an industrial hydrofluoric acid solution to the filtrate after heating; controlling the pH of the reaction end point to 7.5-8.0; filtering after 30-60 min of reaction; obtaining a clear potassium fluoride solution; evaporating and concentrating the potassium fluoride solution; cooling and crystallizing; drying; and obtaining high-purity potassium fluoride with a KF content of 99.5 wt.%.