60 results about "Alkaline catalyst" patented technology

This invention relates to a trifluoromethyl-substituted pyrene-phenylacetonitrile derivative, its preparation method, and its application. A trifluoromethyl-substituted pyrene-phenylacetonitrile derivative has the structural formula: [formula omitted]. The preparation method involves dissolving 1-pyrene formaldehyde, the corresponding trifluoromethylphenylacetonitrile, and an alkaline catalyst in an organic solvent, and carrying out a Knoevenagel condensation reaction under heating conditions. The reaction product is then post-treated to obtain the pyrene-phenylacetonitrile derivative. The application of a trifluoromethyl-substituted pyrene-phenylacetonitrile derivative in electrical storage devices is also discussed. This invention achieves precise control of storage performance by introducing trifluoromethyl groups at different positions on the benzene ring of the pyrene-phenylacetonitrile backbone, providing a novel design approach for developing new multi-level electrical storage materials. The synthesis route is concise and has broad application prospects in the field of high-density non-volatile memory.

This invention relates to a taraxasterol nitrobenzoate derivative in the field of medicinal chemistry, with the following structural formula: Compound B is obtained by reacting taraxasterol 1 with 4-nitrophthalic anhydride in a suitable alkaline catalyst and organic solvent. This synthetic route offers high yield and is easy to implement. Activity tests demonstrate that the taraxasterol nitrobenzoate derivative shown as B, designed and synthesized in this invention, is a suitable antitumor drug candidate, particularly as a candidate drug for lung cancer.

This invention discloses a cashew nut shell bisphenol and its preparation method and application. The preparation method of the bisphenol is as follows: First, cashew nut shell phenol, formaldehyde, and an alkaline catalyst are mixed and stirred evenly, and reacted at a certain temperature to obtain hydroxymethylated product A; product A is washed with water several times until the pH is neutral, and then centrifuged to remove water to obtain product B; product B is mixed with phenol and an acidic catalyst and stirred evenly, and reacted at a certain temperature to obtain product C after the phenol-alcohol reaction; product C is washed with water until neutral, and then distilled under reduced pressure to obtain the cashew nut shell bisphenol product. This invention utilizes the structural characteristics of cashew nut shell phenol, which has both a benzene ring and an alkane chain, to obtain a bisphenol structure that combines the rigidity of the benzene ring with the toughness of the long alkane chain on cashew nut shell phenol, while protecting the highly reactive phenolic hydroxyl group. Moreover, this bisphenol is green and low in toxicity, meeting the requirements of environmental protection and sustainable development. The epoxy coating prepared using this bisphenol has high crosslinking density, good corrosion resistance, and excellent mechanical properties.

This invention discloses a polyolefin-containing DCPD epoxy resin and a copper-clad laminate composition thereof, and its preparation method. The method is characterized by: polymerizing polyallyl phenol and catalyst A at high temperature to form polyallyl phenol; then reacting DCPD, polyallyl phenol, and catalyst B at high temperature to form a polyolefin-containing DCPD phenol resin; subsequently, epoxidizing the resin with epichlorohydrin and alkaline catalyst C to synthesize a polyolefin-containing DCPD epoxy resin; finally, mixing the resin with maleimide resin, phosphorus-containing phenolic resin, imidazole accelerator, inorganic filler, and solvent to obtain the polyolefin-containing DCPD epoxy resin composition for copper-clad laminates. The polyolefin-containing DCPD epoxy resin and copper-clad laminate composition prepared by this invention exhibits low dielectric constant, low dielectric loss, and high heat resistance, making it particularly suitable as a raw material for copper-clad laminates and highly practical.

The application discloses acetoacetamide modified polyvinyl alcohol and a preparation method thereof, and the preparation method comprises the following steps: reacting p-ester and an acetoacetamide reagent at 20-80 DEG C for 1-3h in a polar solvent to generate N-acetoacetyl p-ester; then, the N-acetoacetyl p-ester is mixed with an alkaline catalyst and polyvinyl alcohol, and is added into a double-screw reaction extruder to generate N-acetoacetyl p-ester modified polyvinyl alcohol crude product; finally, the crude product is powdered, washed with methanol for three times to remove the catalyst and reaction inorganic salt, and is filtered and dried to obtain the N-acetoacetyl p-ester modified polyvinyl alcohol. The AAE-PVA prepared by the application can be used as a protective colloid for polyvinyl acetate emulsion polymerization, has better water resistance than common polyvinyl alcohol, and the water resistance, tensile strength and stability of the prepared emulsion adhesive are obviously improved. The synthesis steps of the application are simple, the safety risk is low, and the reaction yield is high.

The present application relates to the technical field of silica sol preparation, and particularly relates to a preparation method of non-spherical high-purity silica sol, and a product and application thereof. The preparation method comprises the following steps: obtaining an active silicic acid component by subjecting a high-purity sodium silicate solution to cation exchange resin; mixing an alkaline catalyst and the active silicic acid component in different feeding sequences, and obtaining non-spherical seeds by aging; heating the seed mother liquor to boiling, adding the active silicic acid component dropwise and controlling pH, and cooling after constant liquid level growth; and obtaining non-spherical high-purity silica sol by ultrafiltration concentration. By controlling the feeding sequence and key process parameters, the present application can prepare a silica sol product with controllable morphology (linear, spherical or potato-shaped), uniform particle size and high purity. When the obtained product is used as a CMP abrasive, the polishing removal rate is increased by more than 25% compared with spherical silica sol, the product is suitable for industrial production, and can be widely applied to the field of semiconductor polishing.

This invention relates to a method for producing biodiesel from beef tallow obtained from slaughter by-products. Specifically, it concerns how to pretreat the beef tallow using pressure distillation and filtration, then mix it with alcohols and a basic catalyst under optimized conditions for esterification, followed by a systematic post-processing procedure to produce high-quality biodiesel. According to the manufacturing method of this invention, the pretreatment conditions, reaction conditions, and post-processing are all optimized, thereby enabling the economical production of high-quality biodiesel with high yield.

This invention relates to a floating photocatalytic material, its preparation method, and its application in cyanobacteria control. The method includes the following steps: uniformly mixing a phenolic compound, an aldehyde solution, a solvent, and an alkaline catalyst, followed by a prepolymerization reaction to obtain a prepolymer; adding a foaming agent to the prepolymer and mixing uniformly to obtain an emulsion; adding an acidic catalyst to the emulsion and undergoing a gelation reaction to obtain a wet gel; and curing the wet gel by heating to obtain the floating photocatalytic material. This invention utilizes an integrated foaming process to simultaneously form a porous structure with interconnected internal components during synthesis, giving the material sufficient low density to achieve self-floating. The material itself is the photocatalytically active component, simultaneously possessing structural support and buoyancy functions, achieving integrated construction of material function and structure. This effectively avoids problems such as active component shedding, loss, and secondary pollution, resulting in high catalytic efficiency. This material can be directly used as a floating board for cyanobacteria control, achieving efficient and eco-friendly continuous inhibition of cyanobacteria.

This invention discloses a method for recycling and reusing off-grade BPA, comprising the following steps: 1) simultaneously feeding off-grade BPA and alkaline solution into a dissolving tank for mixing and dissolution to obtain a raw material solution; 2) heating the raw material solution and feeding it into a cracking reactor packed with a solid alkaline catalyst, where a cracking reaction yields a cracked liquid containing phenol base / phenol / acetone; 3) feeding the cracked liquid into a distillation column for distillation separation, obtaining acetone as a side stream and a phenol base / phenol solution as the bottom of the column; 4) feeding the phenol base / phenol solution and an inorganic acid together into a static mixer for neutralization reaction to obtain a neutralized reaction liquid; 5) feeding the neutralized reaction liquid into a separator for separation to obtain a phenol oil phase and an aqueous phase containing phenol; 6) feeding the aqueous phase containing phenol into a resin bed for adsorption to remove phenol, and discharging the wastewater after it meets the standards. This method can efficiently decompose off-grade BPA and obtain phenol and acetone in high yield.

This invention discloses a highly selective synthesis method for isovlandrin, comprising the following steps: Step S1, reacting guaiacol with a benzylating agent in the presence of an alkaline catalyst and an organic solvent to generate o-benzyloxyanisole; Step S2, reacting the o-benzyloxyanisole with a Vilsmeier-Haack reagent for formylation to obtain 3-benzyloxy-4-methoxybenzaldehyde; Step S3, mixing 3-benzyloxy-4-methoxybenzaldehyde with a 65wt%-70wt% aqueous sulfuric acid solution to perform an acid debenzylation reaction to obtain crude isovlandrin; Compared with the prior art, the yield of isovlandrin can reach up to 70% or more, and the selectivity is greatly improved.

This invention discloses a mesoporous silica nanocarrier for enhancing oral intestinal retention, its preparation method, and its application, belonging to the field of nanomedicine delivery technology. The preparation method of the mesoporous silica nanocarrier includes the following steps: dissolving a template agent and an alkaline catalyst in an ethanol-water solution, adding a silica source material, reacting at 100±50 rpm, and then calcining at high temperature to obtain the mesoporous silica nanocarrier. This invention successfully prepared helical mesoporous silica nanoparticles by controlling the stirring rate during the nanoparticle synthesis process. Due to their unique geometric structure, these nanoparticles exhibit optimal in vitro mucus permeability and intestinal retention characteristics, significantly enhancing the therapeutic effect of loaded drugs and improving drug bioavailability in the intestine. This invention provides a new strategy for constructing efficient oral targeted drug delivery systems and achieving precision treatment of IBD.

The application discloses a method for continuously synthesizing 2-methyl acetoacetate, which comprises the following steps: continuously synthesizing 2-methyl acetoacetate by sequentially feeding raw materials into a micro-channel continuous reactor, a liquid-liquid separator and a fixed bed reactor with a catalyst, wherein the raw materials comprise material A composed of methyl acetoacetate and acetic acid, and material B composed of formaldehyde and an alkaline catalyst. In the method, the continuous double-feeding mode is used, the characteristics of precise dosing of the micro-channel, step-by-step promotion without back mixing and fast reaction are combined, and hydrogenation is carried out after the reaction of the raw materials is completed, so that the problem of reduction of formaldehyde can be effectively solved, the possibility of generation of impurities is reduced from the source, and then the product content and the yield can be improved. The method has the advantages of simple operation, safety and convenience, suitability for industrial production, small equipment investment, high product purity, high yield and the like. The content of the obtained product is more than 98%, the yield is more than 97%, and the product has good market competitiveness.

This invention provides a degradation process for composite polyester materials, relating to the field of polyester recycling technology. The degradation process involves depolymerizing a reaction system comprising at least raw material components (i) composite polyester material, (ii) organic ester compounds, (iii) a co-solvent, and (iv) an alkaline catalyst at a temperature not exceeding 100°C; the weight ratio of the co-solvent to the organic ester compound is ≥0.5. By adding a certain amount of co-solvent to the depolymerization system, this invention achieves directional depolymerization of polyester-containing composite polyester materials while essentially preventing depolymerization of other materials, such as spandex and nylon.

A kind of microporous sulfonated poly (ether ether ketone) membrane for reverse electrodialysis energy conversion, preparation method and application thereof belong to ion exchange membrane technical field. First, bisphenol fluorene, 4,4'-difluorobenzophenone, alkaline catalyst and water-removing agent are added into solvent to carry out nucleophilic polycondensation reaction to obtain poly (ether ether ketone) ;Second, it is dissolved in anhydrous dichloromethane, and chlorosulfonic acid / dichloromethane solution is added to carry out sulfonation reaction to obtain sulfonated poly (ether ether ketone) with different sulfonation degrees;Finally, it is dissolved and formed into film by solution casting method, the main chain is the copolymer of bisphenol fluorene and 4,4'-difluorobenzophenone, and the main chain contains rigid fluorenyl structural unit.The rigid fluorenyl structural unit of the application limits the conformational rotation of the main chain by steric hindrance, forms size-stable intrinsic microporous ion channel, realizes the rigidification of ion channel and the intrinsic microporous structure while maintaining the excellent film-forming property of SPEEK;Long-term operation stability is excellent, preparation process is simple, raw material cost is controllable, and it is suitable for reverse electrodialysis energy conversion field.

This invention provides a method for preparing 1,2-propanediol and its application. The method includes: step (1): in the presence of an acidic catalyst and water, ring-opening of a first portion of propylene oxide to obtain an acid-catalyzed reaction solution containing 1,2-propanediol; step (2): in the presence of an alkaline catalyst and water, ring-opening of a second portion of propylene oxide to obtain an alkaline-catalyzed reaction solution containing 1,2-propanediol; step (3): mixing the obtained acid-catalyzed reaction solution and the alkaline-catalyzed reaction solution for a neutralization reaction to obtain a mixture containing 1,2-propanediol; wherein, the molar ratio of the first portion of propylene oxide to water in step (1) and the molar ratio of the second portion of propylene oxide to water in step (1) are each independently 1:1-5; using the method of this invention to prepare 1,2-propanediol requires only a lower water ratio to obtain a higher propylene oxide conversion rate and 1,2-propanediol content, and the wastewater volume is lower and the color is colorless after the reaction.

This invention provides a mechanically durable, antibacterial, and environmentally friendly marine antifouling coating, its preparation method, and its application. Belonging to the field of marine antifouling materials technology, it comprises the following components: a fluorinated quaternary ammonium salt polysiloxane prepolymer; nano-titanium dioxide; a curing agent; and pigments. The fluorinated quaternary ammonium salt polysiloxane prepolymer is prepared by dehydration condensation reaction of quaternary ammonium salt silane monomer A, phenyl silane monomer B, and fluorinated silane monomer C in an organic solvent under the action of an alkaline catalyst. The quaternary ammonium salt compounds used in this invention possess excellent environmental compatibility and outstanding rapid antibacterial and algaecidal effects, endowing the material surface with continuous microbial inhibition and killing properties. By disrupting the integrity of bacterial cell membranes and interfering with the activity of biological enzymes, it blocks the colonization and reproduction chain of marine attached organisms from the source, significantly improving the coating's resistance to typical fouling organisms such as barnacles and diatoms. Simultaneously, it can significantly improve the coating's modulus and hardness, making it more resistant to scratches, abrasions, and impacts.

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.

The purpose of this invention is to provide a carbon framework supported and embedded Ni3ZnC 0.7 This paper describes the preparation method and application of NiPt1 single-atom alloy catalysts, belonging to the field of functional materials technology. Using a core-shell structure ZIF-8@Ni-MOF as a precursor, porous carbon-supported Ni3ZnC catalysts are prepared by controlling the pyrolysis temperature, time, and Zn / Ni molar ratio. 0.7 Ni particles; Pt single atoms are anchored in situ using current displacement to form a supported single-atom alloy catalyst. Because Pt 4+ with Ni 0 A current displacement reaction occurs, causing Ni nanoparticles to be etched into small nanoclusters, while simultaneously anchoring Pt single atoms to their surface, thus producing a Ni3ZnC coating. 0.7 The outer layer is a NiPt1 single-atom alloy. Ni3ZnC 0.7 The tunable electronic structure of Ni can alleviate OH blockage and lower the water dissociation energy barrier, providing a new pathway for the development of highly efficient alkaline HER catalysts.

This invention discloses a method and system for hydrogen production using recycled PET waste and wastewater, belonging to the field of hydrogen production technology. The method involves immersing the lower half of a microreactor with a three-dimensional porous structure into an alkaline PET depolymerization solution. The alkaline PET depolymerization solution is made from PET waste, wastewater, and an alkaline catalyst. Utilizing the photothermal conversion capability of the microreactor under illumination, the solution is driven upwards to the high-temperature upper half of the microreactor, where vigorous evaporation occurs, producing water and ethylene glycol. The alkaline catalyst is concentrated, precipitated, and participates in catalysis at the evaporation interface. The mixed steam undergoes a KOH catalytic reforming reaction in the high-temperature zone of the microreactor to produce hydrogen. The water vapor is condensed and recovered, and the alkaline catalyst is directly collected. The alkaline catalyst achieves in-situ regeneration and recycling, and absorbs carbon emissions generated during the reaction, achieving zero pollution and high-purity hydrogen production. This invention achieves green energy hydrogen production and plastic degradation through an integrated design of alkaline degradation, alkaline catalysis, and alkaline recovery.

This invention belongs to the technical field of phenolic / glass fiber composite materials, specifically relating to a flame-retardant phenolic / glass fiber composite board, its preparation method, and its application. The flame-retardant phenolic / glass fiber composite board comprises 60-70 wt% glass fiber cloth and 30-40 wt% resin composition cured on the glass fiber cloth. The resin composition consists of the following raw materials in parts by weight: 90-100 parts modified phenolic resin, 5-10 parts epoxy resin, 1-2 parts multifunctional epoxy compound, 1-3 parts toughening agent, and diluent. The amount of diluent is such that the viscosity of the resin composition at 25°C is 150-400 mPa·s. The modified phenolic resin is prepared by reacting phenol, modified phenol, and formaldehyde under the action of an alkaline catalyst. The modified phenol is prepared by transesterification of phenolic alkyl alcohol compounds with phosphonate monocarboxylic acid alkyl esters. The flame-retardant phenolic / glass fiber composite panel of the present invention meets the flame-retardant performance requirements of Part 1 of Appendix F of CCAR-25, which specifies cabin interior facilities or cargo and baggage compartments, without the need for additional flame retardants.

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.

The present invention provides a method for preparing a copolymer, wherein, in the presence of a solvent and an alkaline catalyst (P), at a temperature of 20 to 150°C, a portion of the acid group of a copolymer precursor containing a structural unit (a-1) having an acid group is added to the acid group to form an olefinic unsaturated compound (e) having a functional group that is reactive to the acid group, and the alkaline catalyst (P) has a pKa of 4 to 15 at 25°C.

A method for preparing diisopropyl xanthate, a solid base catalyst is filled into a fixed bed reactor after being immobilized with molybdenum disulfide, a mixed solution of isopropyl alcohol, carbon disulfide and an organic solvent is injected into a micro-mixer through a feeding pump at the same time with oxygen or air, the gas-liquid mixture is fully mixed and then enters the fixed bed for heterogeneous catalytic oxidation reaction. The solid base-immobilized composite catalyst has long service life and good stability; the composite base catalyst can provide an alkaline environment to promote the formation of intermediates and avoid the generation of high-salt wastewater; a micro-mixer is added at the front end of the fixed bed reactor to realize the full mixing of gas-liquid, so that the gas-liquid heterogeneous catalytic oxidation reaction can be continuously carried out with high efficiency and high selectivity; oxygen or air which is cheap and easy to obtain is used as the oxidant, and the by-product is water, basically without three wastes.

The application discloses a florfenicol intermediate and belongs to the technical field of chemical synthesis. By adding aluminum magnesium hydrotalcite composite potassium carbonate as an alkaline catalyst in the preparation process of the florfenicol intermediate, the phenomenon that traditional pure potassium carbonate is easily dissolved and lost in glycerol solvent can be avoided, the prepared florfenicol intermediate has high purity and high yield; the aluminum magnesium hydrotalcite composite potassium carbonate is successively subjected to dimethyl sulfoxide stripping, methanol hydrothermal treatment and hexadecyl trimethyl ammonium bromide intercalation treatment, and modified aluminum magnesium hydrotalcite with a large specific surface area and interlayer spacing is obtained; and the modified aluminum magnesium hydrotalcite is used as a carrier to load potassium carbonate; the modified aluminum magnesium hydrotalcite is a layered structure, and the potassium carbonate is uniformly loaded in the interlayer space and the surface of the hydrotalcite; and the interlayer confinement effect can fix the potassium carbonate, thereby avoiding loss.

This application provides a method for preparing methylcarboxylic acid-2-propynyl ester, comprising the following steps: (1) mixing dimethyl carbonate and propargyl alcohol, adding a first alkaline catalyst, stirring and heating to a temperature of 90-105°C, and distilling out methanol by reactive distillation to obtain a first component; (2) performing solid-liquid separation on the first component to obtain a first liquid, and performing vacuum distillation on the first liquid to remove propargyl alcohol and dimethyl carbonate to obtain methylcarboxylic acid-2-propynyl ester and residue; (3) performing vacuum distillation on the residue, replenishing dimethyl carbonate and the second alkaline catalyst with the distillate for reaction, and reusing the reaction liquid in step (2). This application uses the transesterification reaction of propargyl alcohol and dimethyl carbonate to synthesize methylcarboxylic acid-2-propynyl ester, which has high safety, low overall reaction temperature, fewer by-products and waste, and high yield.

This invention relates to the field of resin preparation technology, and particularly to a method for preparing a water-soluble etherified phenol-urea-formaldehyde mixed resin, comprising the following steps: S1, adding an alkaline catalyst, formaldehyde, urea, and molten phenol to a reaction vessel for reaction, stirring and heating to 40-50°C for 4-5 hours; S2, adding an organic acid to the reaction system in step S1 under stirring to adjust the pH value to 4.9-5.4; S3, adding urea and thiourea to the reaction vessel and reacting at a reaction temperature of 45°C for 60 minutes; S4, adding an alcohol compound to the reaction vessel, raising the reaction temperature to 50°C and reacting for 60 minutes; S5, adding an alkaline solution to the reaction system obtained in step S4 to adjust its pH value to 6.5-6.8, and then stirring at 50°C to obtain the water-soluble etherified phenol-urea-formaldehyde mixed resin. The water-soluble etherified phenol-urea-formaldehyde mixed resin material prepared by this method has good water solubility and low viscosity, which can improve the profile control and water shut-off effect in oil fields.