609 results about "Green chemistry" patented technology

The invention provides a method and system for detecting the content of platinum, palladium and rhodium in an automobile exhaust purification catalyst and application, and relates to the technical field of automobile exhaust purification, the method comprises the following steps: crushing, grinding, sieving, performing microwave acidolysis, neutralizing, washing and drying a catalyst sample to obtain dry filter residues; a trapping agent and a fluxing agent are added into the dry filter residues, constant-temperature heating is conducted in inert gas, then cooling forming is conducted, and an alloy button is obtained; blowing ash on the alloy, then adding mixed acid into the alloy, heating the alloy in a water bath at 95 DEG C for 25-35 minutes to obtain a dissolved solution, then adding a masking agent into the dissolved solution, and oscillating to obtain a solution to be detected; and filtering the liquid to be detected, fixing the volume and detecting. According to the method, precise quantification of trace platinum, palladium and rhodium in the complex matrix catalyst can be realized, and the method has a relatively high recovery rate; meanwhile, pollution elements are prevented from being used, and the method is green and efficient and better conforms to the concept of green chemistry.

The invention provides a preparation method of 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride, which comprises the following steps: salifying 4-fluoro-3, 5-dimethylaniline serving as a substrate with concentrated hydrochloric acid, reacting with sodium nitrite to prepare a diazo solution, reducing the diazo solution into corresponding phenylhydrazine by using alkaline sodium sulfite as a reducing agent system, and reacting the 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride with the diazo solution to prepare the 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride. And acidizing the 2, 5-dimethyl phenylhydrazine to obtain corresponding phenylhydrazine hydrochloride. According to the preparation method, sodium sulfite which is low in cost and easy to obtain is used as a reducing agent, the defects that metal residues are high, the environment is prone to being polluted and the raw material cost is high due to the fact that a metal reducing agent is adopted when phenylhydrazine hydrochloride is prepared in the prior art are overcome, the reaction is completed in a water phase, no organic solvent is adopted, and the concept of green chemistry is met; and the problems of complicated post-treatment and easy pollution caused by the adoption of an organic solvent can be effectively avoided.

The invention discloses preparation and application of an environment-friendly P, N and Si synergistic flame retardant. According to the flame retardant (KDOPO-LDH (at) GO), a plurality of flame-retardant elements such as P, N and Si are integrated, so that an efficient synergistic flame-retardant system is constructed. Wherein the existence of the N element and the Si element effectively promotes the uniform dispersion of the flame retardant in an epoxy resin matrix; meanwhile, the unique molecular structure of the P-containing component endows the carbon-forming agent with excellent carbon-forming performance under a high-temperature condition. Through the synergistic effect of multiple elements, the flame retardant property of the epoxy resin is remarkably improved, and meanwhile, the good mechanical property of the material is effectively maintained. In addition, halogen-free and low-toxicity substances are mainly generated in the pyrolysis process of the flame retardant, and the green chemical concept is met.

The invention provides an airflow drying and surface modification technology for lemon fibers, relates to the technical field of lemon surface processing, and realizes the whole process optimization of lemon fiber production through ultrasonic-microwave synergistic extraction, pulse type ultrasonic-hot air coupling airflow drying, low-temperature plasma surface modification and an intelligent control system based on Q-learning. The pectin yield is increased by about 20% through ultrasonic-microwave synergistic extraction, the extraction time is shortened by 50%, flow drying is assisted by double-frequency ultrasonic waves and magnetized water mist, the drying time is shortened by 50%, the energy consumption is reduced by 20%, the fiber softness is improved by 15%, the fiber is endowed with 99% antibacterial rate and excellent hydrophilicity through low-temperature plasma modification, chemical reagents are not needed, and environmental pollution is reduced. The intelligent control system converts waste liquid into ethanol and lactic acid through real-time data optimization and closed-loop resource utilization, zero waste discharge is achieved, the ethanol yield is increased by 12%, the additional value of lemon peel byproducts is remarkably increased, and the method is suitable for the fields of food and materials and conforms to the green chemistry concept.

The invention discloses a surface defect and oxygen doping co-modified pore-rich g-C3N4 nano material as well as preparation and application thereof. The preparation method comprises the following steps: mixing a white viscous melamine-cyanuric acid suspension with an oxalic acid solution to obtain a melamine-cyanuric acid-oxalic acid suspension solution, carrying out hydrothermal treatment to obtain a hydrogen bond connected self-assembled supramolecular aggregate, and finally carrying out thermal polycondensation on the self-assembled supramolecular aggregate and formaldehyde to obtain the surface defect and oxygen doping co-modified porous g-C3N4. The surface defect and oxygen doping co-modified g-C3N4 nano material with different morphologies and physicochemical properties is obtained. The preparation method is simple in process flow, efficient, low in cost and suitable for large-scale production, and the synthesis process meets the green chemical requirement; the obtained nano material has a higher specific surface area and more active sites, and has higher catalytic reaction and adsorption performance on organic pollutants, namely levofloxacin, ciprofloxacin and tetracycline hydrochloride, in a water body.

The invention discloses a precise construction strategy of a dibenzothiophene sulfuryl covalent organic framework material and systematically explains efficient application of the dibenzothiophene sulfuryl covalent organic framework material in photocatalytic synthesis of thiadiazole and derivatives thereof. The achievement relates to a plurality of leading subjects such as catalytic chemistry, organic synthesis, material science, environmental engineering and green chemistry. According to the method, 2, 4, 6-triformyl phloroglucinol and 3, 7-diaminodibenzo [b, d] thiophene-5, 5-dioxide are taken as construction units, and the crystalline S-COF rich in sulfuryl active sites can be quantitatively obtained through topology-oriented Schiff base condensation under the conditions of protonic acid catalysis, no water and no oxygen. Under the radiation condition of visible blue light, S-COF is used as a heterogeneous photocatalyst to drive green synthesis of 3, 5-di-p-tolyl-1, 2, 4-thiadiazole and series of derivatives thereof; the invention provides a new catalyst design normal form for light-induced organic conversion, and lays a solid foundation for sustainable development-oriented efficient synthesis chemistry.

The invention provides a synthesis method of tilpotide, which comprises the following steps: dividing a target peptide chain into six fragments, and adopting bis (4-C18-C28 alkoxy phenyl) methylamine, 2, 4-bis (18-C28 alkoxy)-benzyl alcohol and NH2-Asp (OTAG)-OR1 as hydrophobic label carriers to assist synthesis. A side chain carboxyl group of aspartic acid is innovatively used as an anchoring position of a hydrophobic label, a new fragment connection route is designed, a full-protection tilpotide conjugate is synthesized through a multi-label synergistic effect, and finally a protecting group and a label are removed by using a TFA lysate. Compared with a solid-phase synthesis method, the method is carried out in a homogeneous reaction, the dosage of amino acid and the condensing agent is reduced to 1-1.2 times from 2-3 times, and the cost is remarkably reduced. Compared with an existing hydrophobic labeling method, the method has the advantages that multiple labels can be introduced to serve as protecting groups, the yield and purity of synthesis of medium-chain and long-chain polypeptides are improved, meanwhile, the problem of hydrophobicity attenuation caused by peptide chain extension is solved, and the green chemical process requirement is met.

The present invention relates to the technical field of polymer preparation. Disclosed are a covalent organic framework material, and a preparation method therefor and a use thereof. The preparation method for the covalent organic framework material comprises the following step: subjecting an organic aldehyde and an organic amine to a condensation reaction in a deep eutectic solvent to obtain the covalent organic framework material, wherein the deep eutectic solvent is a two-component eutectic liquid composed of menthol and acetic acid. The temperature for the reaction is 25-120ºC, and the time for the reaction is 1-72 hours. The deep eutectic solvent composed of menthol and acetic acid used in the present invention has good dissolution properties for organic matters, and can also efficiently catalyze the condensation reaction between the organic amine and the organic aldehyde. The prepared covalent organic framework material exhibits high crystallinity and has good applications in the fields of adsorptive separation, heterogeneous catalysis, energy storage, etc. The present method has mild reaction conditions, simple operation, and good universality, is conducive to industrial large-scale production, and conforms to the concept of green chemistry.

The invention discloses a method for preparing nano copper powder based on a microwave-assisted reduction method and application. The method comprises the following steps: a) preparing a copper ion solution; b) adding a dispersing agent and a surfactant; c) adding a reducing agent; d) microwave heating reaction; e) separating and purifying a product; and f) drying. According to the method, directional reduction and morphology regulation and control of copper ions are achieved through the synergistic effect of a microwave field and chemical reduction, the specific surface area of the obtained product reaches 25-35 m < 2 > / g, the oxygen content is lower than 0.8 wt%, and excellent performance is shown in the fields of electronic packaging and conductive ink; the method has the characteristics of short reaction time (shortened by 90% compared with the traditional method), low energy consumption (less than 0.5 kWh / kg), no harmful by-product and the like, and meets the requirements of green chemical industrial production.

The invention provides a preparation method and application of a matcha-based carbon quantum dot green corrosion inhibitor. The novel environment-friendly carbon quantum dot is successfully synthesized by taking matcha powder and polyethyleneimine as precursors and adopting a hydrothermal method, and low-dose and high-effect carbon steel anti-corrosion protection can be remarkably realized by introducing a nitrogen-containing functional group (such as amino) on the surface of a matcha molecule containing hydroxyl and carboxyl. The matcha-based carbon quantum dot is used for a carbon steel corrosion inhibitor, self-corrosion of carbon steel in an acid medium can be inhibited, the corrosion resistance is improved, the higher requirement of the green chemistry concept on corrosion inhibitor development is met, and the problem that an existing carbon quantum dot corrosion inhibitor is not ideal in corrosion inhibition performance is solved.

The invention relates to the technical field of preparation of compounds, in particular to a sulfenamide compound and a preparation method thereof. Compared with the prior art, a mild electrochemical method is adopted for preparing the sulfenamide compound forming the N-S bond, in the reaction process, halide salt serving as electrolyte is subjected to oxidation reaction at an anode to obtain free radicals, and after decarburization of an amine compound is promoted by the free radicals and alkali together, the free radicals react with disulfide or mercaptan to form the sulfenamide compound forming the N-S bond; the method disclosed by the invention has the advantages of good substrate compatibility and functional group tolerance, no need of additional addition of an oxidizing agent and a transition metal catalyst, simple reaction post-treatment operation and the like, is convenient to operate, high in atom utilization rate and mild in reaction condition, meets related requirements of green chemistry, and has a good development prospect.

The invention provides a two-dimensional layered kaolinite nanofiltration membrane, and a preparation method and application thereof, and the preparation method comprises the following steps: mixing kaolinite powder and an intercalator according to a first solid-to-liquid ratio, heating, stirring, carrying out intercalation reaction completely, and carrying out solid-liquid separation to obtain a solid kaolinite intercalation compound; mixing the kaolinite intercalation compound with water according to a second solid-to-liquid ratio, adjusting the pH value of the mixed solution to 9-13, and carrying out dispersion treatment to obtain a kaolinite nanosheet dispersion liquid; enabling the kaolinite nanosheet dispersion liquid to penetrate through the porous basement membrane, and depositing kaolinite nanosheets in the kaolinite nanosheet dispersion liquid on the porous basement membrane to obtain the two-dimensional layered kaolinite nanofiltration membrane; the operation steps are simple, no complex equipment or a large amount of organic solvent is used, and the method conforms to the concept of green chemistry. The prepared two-dimensional layered kaolinite nanofiltration membrane can be used in various fields of water treatment, organic solvent separation and the like, and has a wide application prospect.

The invention belongs to the technical field of green chemistry and sustainable chemical engineering, and discloses a method for recovering an acidic eutectic solvent by combining anti-solvent precipitation with activated carbon adsorption. Water-insoluble high-molecular-weight lignin in the deep eutectic solvent black liquor is removed by an anti-solvent precipitation technology, and then residual low-molecular-weight water-soluble lignin and polysaccharide in the solution are further adsorbed and removed by using activated carbon with high specific surface area and rich pore structure; and the eutectic solvent with high purity and unobviously changed structure is recovered. The method is suitable for various acidic deep-eutectic solvents, the operation is simple, water and activated carbon in the recovery process can be repeatedly used, and the obtained water-insoluble lignin, water-soluble lignin and polysaccharide have high application value.

The invention relates to the technical field of biochemistry, in particular to an enzyme mutant and application thereof in preparation of conopeptide. According to the preparation method, a strategy of combining green chemistry and an enzyme method is adopted, seven tripeptide fragments are taken as raw materials, a conopeptide main chain is prepared through a liquid-phase synthesis method, and then enzymatic precise modification and synthesis are realized by utilizing a multiple directed evolution enzyme concerted catalysis system. Based on the efficient connection characteristic of a liquid-phase synthesis system and the high substrate specificity of an enzymatic system, the complex protection group operation in traditional solid-phase synthesis is effectively avoided, generation of by-products is remarkably reduced, meanwhile, fixed-point modification and precise assembly of a conopeptide main chain are achieved, and the application prospect is wide. And an efficient and green new path is provided for the continuous production of the cosmetic-grade high-purity conopeptide.

The invention provides a tetrahydropyrrole continuous flow process preparation method, which comprises: S101, taking a porous Co3O4-based composite catalyst and a CuAl metal oxide catalyst, mixing, placing in a continuous flow reactor, and adjusting the reaction temperature to 300-350 DEG C and the pressure to 0.5-1.5 Mpa; and S102, continuously introducing tetrahydrofuran and ammonia gas into the continuous flow reactor, carrying out a continuous catalytic reaction, condensing, and collecting a reaction product in a gas-liquid separator to obtain tetrahydropyrrole. According to the method, two catalysts are prepared and jointly put into the continuous flow reactor into which ammonia gas and tetrahydrofuran are introduced to realize continuous production of tetrahydropyrrole, the method has the advantages of efficient mass and heat transfer, avoidance of generation of hot spots, shortening of reaction time, reduction of energy consumption and the like, meanwhile, the use of organic solvents can be reduced, and the method has green chemical guidance quality.

The invention discloses a method for preparing p-benzoquinone through selective electrocatalytic oxidation of phenol by using a carbon cloth loaded ferronickel catalyst, the method adopts the carbon cloth loaded ferronickel catalyst as an anode to realize efficient conversion of phenol in an aqueous solution into p-benzoquinone, and the product is only p-benzoquinone. The method has the advantages of simple operation process, mild reaction conditions, high catalytic activity, high chemical selectivity and high target compound yield. The p-benzoquinone is prepared by oxidizing phenol in an alkaline environment, so that the use of toxic and harmful chemical oxidants is avoided, the pollutant emission is reduced from the source, and the method is an environment-friendly synthesis process and conforms to the development concept of green chemistry.

The invention discloses a corrosion inhibitor for oil and gas fields. Benzotriazole, polycarboxylic acid, sodium phosphate, polymaleic anhydride, zinc oxide nanoparticles, chitosan, phytic acid and water are used as main components, the corrosion inhibition performance and stability are remarkably improved through the synergistic effect of the multiple components, a stable protective film can be formed under the high-temperature and high-pressure conditions through the unique component combination, metal corrosion is effectively prevented, and the corrosion inhibition performance is good. The long-term use stability of the corrosion inhibitor is remarkably improved, and a safer and more lasting protection solution is provided for oil and gas field equipment. In addition, due to the addition of natural components such as chitosan and phytic acid, the environmental friendliness of the corrosion inhibitor is enhanced, the negative influence on an ecological system is reduced, and the concept of modern green chemistry is met.

The invention discloses an environment-friendly waterborne polyurethane glove and a preparation method thereof. The environment-friendly waterborne polyurethane glove comprises a glove core and an environment-friendly waterborne polyurethane layer wrapping the surface layer of the glove core. The environment-friendly waterborne polyurethane layer is prepared from the following raw materials in parts by mass: 20 to 35 parts of isocyanate, 40 to 60 parts of bio-based polyol, 3 to 8 parts of a fluorine-containing chain extender, 0.5 to 3 parts of nano cellulose, 1 to 5 parts of an environment-friendly cross-linking agent, 0.3 to 1.5 parts of a nonionic emulsifier, 2 to 6 parts of an environment-friendly plasticizer, 0.1 to 0.5 part of a low-toxicity preservative and 15 to 30 parts of deionized water. The preparation method has the advantages that no organic solvent is contained, no VOCs are discharged in the production process, the green chemistry principle is met, and the overall strength and performance are higher.

The invention belongs to the technical field of antibacterial materials, and particularly relates to a sericin / tannic acid-silver antibacterial-anti-biofilm nanocomposite as well as a preparation method and application thereof. According to the method, the TA-Ag nano material is prepared by adopting a simple water bath method; and then, dispersing SS in a TA-Ag aqueous solution to realize hydrogen bond combination of SS and TA so as to obtain the SS / TA-Ag nanocomposite with a stable structure. In the preparation process, plant polyphenol tannic acid is taken as a carrier, silver ions and tannic acid are combined by adopting a water bath method, and the antibacterial property of tannic acid is effectively improved; and the sericin is further modified through hydrogen bond crosslinking, so that the obtained composite material not only has antibacterial and anti-biofilm dual functions, but also is simple in preparation process and mild in reaction condition, and conforms to green chemistry and environment-friendly concepts.

The invention relates to a diyne functionalized covalent organic framework material as well as a preparation method and application thereof, and the diyne functionalized covalent organic framework material is synthesized by taking 4, 4 ', 4', 4 ''-(pyrene-1, 3, 6, 8-tetrayl) tetraphenylamine and 5, 5 '-(butyl-1, 3-diyne-1, 4-diyl) diisophthalaldehyde as construction units and adopting a Schiff base reaction. The dialkynyl functionalized covalent organic framework material disclosed by the invention has good chemical stability and can be used as a carrier to controllably grow silver nanoparticles through metal coordination to obtain a composite material, and the composite material shows excellent catalytic activity and cycling stability in a 4-nitrophenol reduction reaction catalyzed by sodium borohydride; therefore, the method has important application potential in the fields of environmental restoration, green chemistry and the like.

The invention relates to the technical field of chemical catalysis, in particular to a polyether polymerization catalyst which comprises the following components: double metal cyanide (DMC) of which the average particle size is 20-50nm, a cocatalyst of which the addition amount is 3-5% of the total mass of the catalyst, a Lewis acid-alkali pair catalyst of which the addition amount is 3-5% of the total mass of the catalyst, and a dispersing aid of which the addition amount is 1-2% of the total mass of the catalyst, the preparation method comprises the following steps: preparing a granular catalyst suitable for an industrial scale through a spray drying molding technology, improving the catalytic efficiency by 20% or more and reducing side reactions by 30% or more under the condition of 60-80 DEG C, and the generated polyether has narrow molecular weight distribution (PDilt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt and PDIt); 1.2) and a low degree of unsaturation (lt; the quality of the product is obviously improved, and the product is suitable for high-end application of polyurethane, lubricating oil and green chemicals.

The invention discloses a chitin-based fluorescent film for Zr < 4 + > detection and a preparation method thereof. The material takes a chitin film as a substrate and is chemically modified in situ by a one-pot method. The method comprises the following steps: firstly, dissolving chitin in an alkali / urea system, preparing a chitin film through a tape casting method, and washing the film with deionized water until the pH value is neutral; then, a multi-component Mannich reaction is adopted, the chitin thin film obtained after hot pressing reacts with quercetin molecules and aldehyde compounds, and the modified covalent grafted chitin-based fluorescent thin film is obtained. Through introduction of quercetin molecules, the chitin film is endowed with fluorescence performance, and meanwhile, carbonyl and polyhydroxy structures of quercetin have the capability of easily forming strong complexes with metal ions, so that the modified chitin-based fluorescent film has the characteristic of quantitatively detecting the metal ions. The preparation method disclosed by the invention accords with green chemistry, is simple to operate and stable in performance, and can be used for rapidly and highly selectively detecting zirconium (IV) ions.

The present invention belongs to the field of functional resins and specifically relates to a lignin-modified dicyclopentadiene phenol resin and a preparation method thereof. The present invention utilizes phenol to phenolate bamboo lignin under alkaline conditions, and then uses methanesulfonic acid to catalyze the reaction of the phenolated bamboo lignin, phenol, and dicyclopentadiene to prepare the dicyclopentadiene phenol resin. This reduces the amount of phenol used in the dicyclopentadiene phenol resin and improves its heat resistance, corrosion resistance, and other properties, resulting in high bonding strength, friction resistance, and electrical insulation. Furthermore, the preparation method is simple, the reaction conditions are mild, and the production cost is low, meeting the environmental protection needs of modern society while also adhering to the principles of green chemistry and chemical atom economy.

The application provides a method for synthesizing an eplerenone intermediate N-1 by one-pot method, and belongs to the technical field of organic synthesis. The method is characterized in that: the eplerenone intermediate N-4 is dissolved in dichloromethane, a potassium carbonate aqueous solution and dibromohydantoin are added to perform an opening ring reaction; after the reaction is completed, hydrochloric acid is directly added to perform a rearrangement reaction; then water is separated and methanol is added in the organic layer to perform an ozonation reaction; then sodium sulfite is added to perform a reduction reaction; then hydrochloric acid is added to perform a methyl esterification reaction, so as to obtain the eplerenone intermediate N-1 crude product, and finally the eplerenone intermediate N-1 fine product is obtained through refining. The method realizes the one-pot synthesis of the eplerenone intermediate N-1 from the eplerenone intermediate N-4 through the continuous reactions of opening ring, rearrangement, ozonation, reduction and methyl esterification, and can avoid column chromatography purification, so that the method becomes a green chemical process route with greatly reduced organic solvent consumption and wastewater.

This invention relates to the field of organic synthesis technology and discloses a method for preparing 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylic acid ester, comprising the steps of: S1, providing raw material: 3-cyclohexenecarboxylic acid-3′-cyclohexene methyl ester; S2, epoxidation reaction: mixing the raw material with hydrogen peroxide, a composite catalyst, and a buffer to obtain a reaction solution containing the target product; S3, separation and purification: allowing the reaction solution to stand and separate into layers, separating the organic phase, washing with water, drying, and vacuum distilling to obtain 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylic acid ester. This method for preparing 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylic acid ester uses hydrogen peroxide as the oxygen source, resulting in no heavy metal pollution, low wastewater volume, and conforming to the trend of green chemistry. The composite catalyst requires a small amount, has high activity and good selectivity, can be recycled ≥5 times, reducing costs, requiring less equipment, and is highly safe. The product is colorless and transparent, with a high epoxy value, purity ≥98.5%, low acid value, and good stability.

The invention belongs to the technical field of sodium ion batteries, and provides a method for preparing biomass-based hard carbon by pretreating paper pulp fibers to change the beating degree, a negative electrode material and a sodium ion battery. According to the method, the bamboo pulp fiber is used as a biomass precursor, the beating degree is accurately regulated and controlled, the form and structure of the bamboo pulp fiber are changed, and then carbonization treatment is performed, so that the hard carbon material with excellent sodium storage performance is obtained and is used for the negative electrode of the sodium-ion battery. The pretreatment method is easy and convenient to operate, harmful substances are not introduced in the whole treatment process, and the concept of green chemistry and sustainable development is met. The hard carbon negative electrode material prepared by the method shows excellent sodium storage performance in practical application of the sodium-ion battery, and the comprehensive performance of the sodium-ion battery can be effectively improved.

The application provides a method for synthesizing triaminotriphenylmethane, which does not need to use a solvent, uses N,N'-dibenzylaniline and trialkoxymethane as synthetic raw materials, and makes N,N'-dibenzylaniline and trialkoxymethane undergo a Friedel-Crafts alkylation reaction, so as to avoid the generation of 2,4',4"-triaminotriphenylmethane isomers in a traditional synthesis method by using the steric effect of two benzyl protective groups, thereby obtaining 4,4',4"-tri(N,N'-dibenzylaminophenyl)methane with high selectivity. 4,4',4"-tri(N,N'-dibenzylaminophenyl)methane is further subjected to a debenzylation reaction under neutral conditions to form triaminotriphenylmethane. According to the chemical structural formula of the target product, the benzyl group as the protective group of the amino group is reduced under a neutral environment, and the benzyl group is removed, and the formed byproduct is only toluene, which not only ensures the high yield and high selectivity of the target product, but also is very beneficial to obtaining high-purity 4,4',4"-triaminotriphenylmethane, and conforms to the principle of green chemistry.

The invention belongs to the technical field of synthesis of 2, 3-dipicolinic acid, and relates to a catalyst for synthesizing 2, 3-dipicolinic acid as well as a preparation method and application thereof, the catalyst is prepared from a carrier, and active components and auxiliaries loaded on the carrier; the carrier is boron nitride modified aluminum oxide, the active component is palladium-cobalt bimetal, and the auxiliary agent is magnesium; the catalyst comprises the following components in percentage by mass: 0.2 wt%-3wt% of palladium, 0.5 wt%-4wt% of cobalt, 0.05 wt%-0.3 wt% of magnesium, 5wt%-15wt% of boron nitride and the balance of an aluminum oxide carrier. The catalyst is prepared by adopting an ultrasonic-assisted sol-gel method, so that high dispersion and strong interaction of active components are realized. The catalyst shows high catalytic activity, high selectivity and excellent stability in a dichloropyridine carbonylation reaction, carbon monoxide is used as a carbonyl source, the atom economy is high, and the green chemical requirement is met.

The invention discloses a method for catalytically synthesizing a secondary amine acetate derivative by using lignite residues, which comprises the following steps: taking an amine (primary amine) compound and an aryl diazo ester compound as raw materials to react for preparation, and taking the lignite residues as a catalyst. The catalyst lignite residue adopted by the method is wide in source, low in cost and easy to obtain, the reaction condition is mild, the yield is good, gram-scale reaction can be achieved, and the method has industrialization prospects. The lignite residues are high in catalytic activity and can be recycled, recycling of waste resources is achieved, the problem that the lignite residues are difficult to treat is solved, and the method conforms to the sustainable development concepts of environmental protection and green chemistry.

The invention provides a preparation method of fluoride ether bacteria amide, which comprises the following steps: dissolving pentafluorobenzonitrile in a solvent, dropwise adding a sodium methoxide solution at-10-30 DEG C for 2-15 hours, continuing to carry out heat preservation reaction for 0.5-2 hours after dropwise adding, and carrying out post-treatment to obtain 2, 3, 5, 6-tetrafluoro-4-methoxybenzonitrile; the preparation method comprises the following steps: jointly dissolving 2, 3, 5, 6-tetrafluoro-4-methoxybenzonitrile, 3-chloro-5-(trifluoromethyl) pyridine-2-yl) methanol and a catalyst acid in a solvent, reacting at 50-110 DEG C for 5-32 hours, and performing post-treatment on the obtained reaction liquid to obtain fluoride ether bacteria amide, according to the method, sodium methoxide and pentafluorobenzonitrile which are low in price and easy to obtain are subjected to etherification reaction, thionyl chloride and bis (trichloromethyl) carbonate are not used, the green chemical principle is met, and the method has the advantages of being short in step, safe and easy to operate and the like, so that the method has high implementation value and practical production applicability.