165results about "Ether preparation" patented technology

Disclosed are modified Type 1 O-methyltransferases (OMTs) and methods of using such modified OMTs. In some forms of the modified OMTs, the amino acid corresponding to Phe337 of Sorghum bicolor stilbene OMT (SbSOMT) is substituted with a polar amino acid. In some forms of the modified OMTs, the amino acid corresponding to Asn323 of Sorghum bicolor caffeic acid OMT (SbCOMT) is substituted with a hydrophobic amino acid. In some forms of the modified OMTs, the amino acid corresponding to Ile144 of SbSOMT is substituted with a polar amino acid. In some forms of the modified OMTs, the amino acid corresponding to Asn128 of SbCOMT is substituted with a hydrophobic amino acid.

This invention belongs to the field of high-value utilization technology of biomass resources, and discloses a method for catalyzing the depolymerization of lignin into phenolic compounds using a RuNiZn / Nb2O5 catalyst. The method includes: uniformly mixing the RuNiZn / Nb2O5 catalyst, lignin-containing biomass feedstock, and water; stirring under hydrogen atmosphere to carry out the depolymerization reaction; after the reaction, cooling to room temperature and performing solid-liquid separation; evaporating the solvent to obtain the hydrogenated depolymerization product containing monophenols. In this invention, the RuNiZn / Nb2O5 catalyst employs a technique of replacing precious metals with various non-precious metals, which improves the catalyst's reactivity and reduces the amount of precious metals used. This increases the yield of lignin depolymerization products, provides milder depolymerization reaction conditions, and ultimately significantly reduces the catalyst preparation cost and the energy cost of the lignin depolymerization process.

The invention relates to a multifunctional tandem catalytic process for directly preparing methyl acetate / ethanol from synthesis gas. According to the process, a novel catalyst for preparing dimethyl ether from synthesis gas is prepared by adopting an impregnation method, and after the catalyst is sequentially connected with a dimethyl ether carbonylation catalyst and a hydrogenation catalyst in series, efficient directional synthesis of methyl acetate and ethanol is realized in a double-bed or three-bed sequential filling form. According to the invention, high CO conversion per pass, high methyl acetate selectivity and low acetic acid selectivity can be realized, and the problems of corrosion and difficult conversion of a subsequent hydrogenation system are effectively avoided; the multifunctional catalytic system provided by the invention is simple in preparation method and easy to realize industrial large-scale production.

The invention discloses a CuGa-S-1 catalyst for catalyzing hydrogenation of carbon dioxide to prepare dimethyl ether, an S-1 molecular sieve is used as a carrier, Cu and Ga are used as active components and are uniformly dispersed on the S-1 molecular sieve, the molar ratio of Ga to Cu is 1.0-3.0, the mass fraction of Cu is 2-10%, and the mass fraction of Ga is 2-20%. The invention also discloses a preparation method and application of the CuGa-S-1 catalyst for catalyzing hydrogenation of carbon dioxide to prepare dimethyl ether. The preparation method disclosed by the invention is simple and easy to operate, large-scale industrial production is easy to carry out, and high dimethyl ether selectivity is shown in a reaction for preparing dimethyl ether through carbon dioxide hydrogenation.

The invention discloses a preparation method of fluoroether, an electrolyte, a battery and a power utilization device. The invention relates to the technical field of batteries, in particular to a preparation method of fluoroether, an electrolyte, a battery and a power utilization device. The preparation method of the fluoro-ether comprises the following steps: reacting a metal fluoride solution with a carbonyl compound and an alkyl compound to obtain the fluoro-ether, wherein the fluoroether has a simple structural formula as shown in a formula (I), and R1 is straight-chain or branched-chain alkane; r2 is fluoroalkane, wherein the number of fluorine atoms is 4. The invention provides a novel fluoro-ether synthesis route which can be carried out in a normal pressure environment, the process is simple, the post-treatment is simple, the yield of fluoro-ether is improved, side reactions are reduced, and the product is easy to separate.

Methods for the production of syringol from biomass are provided. Reactive diluents derived from syringol and their use in 3D printing are also provided.

The application discloses a preparation method of a key intermediate of dapagliflozin, and belongs to the technical field of preparation of medical intermediates. The preparation method of the key intermediate of dapagliflozin comprises the following steps: 1, 1-ethoxy-4-methylbenzene is prepared by using p-cresol, sodium hydroxide and diethyl sulfate; 2, (4-ethoxybenzyl) phenyl sulfide is prepared by using 1-ethoxy-4-methylbenzene, thiophenol, a palladium catalyst, an alkali and an oxidant; 3, 1-benzyl-4-ethoxybenzene is prepared by using (4-ethoxybenzyl) phenyl sulfide under a hydrogen atmosphere; 4, 4-ethoxy-2'-chlorobenzhydrol is prepared by carrying out chlorination reaction on 1-benzyl-4-ethoxybenzene; and 5, 5-bromo-2-chloro-4'-ethoxybenzhydrol is prepared by carrying out bromination reaction on 4-ethoxy-2'-chlorobenzhydrol. The yield and purity of 5-bromo-2-chloro-4'-ethoxybenzhydrol prepared by the method are higher, the process is safer, and the production cost is reduced.

This invention discloses a Cu-Si matrix for the synthesis of methanol / dimethyl ether from CO2. x Al 1‑x The catalyst preparation method and application are described. This catalyst can precisely control the selectivity of methanol and dimethyl ether. The catalyst is prepared from silica sol, aluminum isopropoxide, and copper nitrate trihydrate as raw materials. The precursor solution is uniformly mixed with a hexadecyltrimethylammonium chloride solution, followed by aging, evaporation, drying, and low-temperature calcination to produce a Cu-Si catalyst with defined active sites. x Al 1‑x Cluster catalyst, Cu nanoclusters encapsulated by Si with a defined composition x Al 1‑x Enclosed, but due to Si x Al 1‑x The different Si ratios and placement methods restrict the size and electronic states of Cu nanoclusters. As can be seen from the TEM images, the size of Cu nanoclusters increases with increasing Si content, thus forming Cu-Si nanoclusters with different active sites and different Cu electronic states. x Al 1‑x catalyst.

This invention discloses a method for preparing ethylhexylglycerol and its application, comprising the following steps: adding isooctanol and a base to a solvent, stirring and cooling to 0-5 degrees Celsius, then adding a dichloromethane solution of p-toluenesulfonyl chloride dropwise. After the addition is complete, the mixture is brought to room temperature and stirred for a period of time. A sample is taken for gas chromatography analysis until the isooctanol is completely consumed. Water is added to separate the layers, and the dichloromethane layer is collected. The dichloromethane layer is washed twice with water and dried to obtain a dichloromethane solution of isooctyl p-toluenesulfonate, which is then dried and reserved. Glycerol and boric acid are added to a reaction flask for dehydration reaction, and after the reaction is complete, a diglyceride borate intermediate is obtained. The prepared diglyceride borate intermediate is added dropwise to a dichloromethane solution of isooctyl p-toluenesulfonate to obtain isooctyl borate diglyceride ether. Then, the solvent is removed, and the mixture is hydrolyzed with water to obtain the target compound, ethylhexylglycerol. This invention, through the application of the diglyceride borate structure, reduces the generation of by-products, and the overall yield is higher compared with current traditional processes.

A continuous method includes passing a first steam feed stream and one or more of a recycled tail gas stream and a methane-rich feed stream to a cathode of a first electrolyzer containing the cathode, an anode and an electrolyte inserted between the cathode and the anode, thereby producing a cathode effluent including syngas, and passing the cathode effluent including syngas to a reactor unit, thereby producing a chemical product or a fuel-based product.

Processes and systems are disclosed for converting animal manure into useful energy and materials. Some variations provide a process for converting animal manure into a purified thermal gas, comprising: drying a starting animal manure in a manure dryer; pelletizing the dried animal manure to generate manure pellets; thermally reacting the manure pellets in a thermal reactor to generate an intermediate thermal gas and a solid biochar; separating out the solid biochar; condensing the intermediate thermal gas to generate a cooled thermal gas; compressing the cooled thermal gas to generate a compressed thermal gas; catalytically reacting the compressed thermal gas in a water-gas shift reactor to generate a shifted thermal gas having an adjusted H2 / CO ratio; treating the shifted thermal gas using an acid-gas removal unit to generate a purified thermal gas; removing water and / or light gases from the purified thermal gas; and recovering or further processing the purified thermal gas.

The invention provides a coupling power generation process for directly synthesizing dimethyl ether through plasma co-gasification. According to the invention, the production process is simplified, the supercritical CO2 Brayton cycle is integrated, and efficient waste heat and power generation recovery is realized. In order to utilize carbon dioxide in waste gas, an alkaline electrolytic cell hydrogen production process and a carbon dioxide hydrogenation methanol process are systematically introduced. Model verification and sensitivity analysis confirm the reliability of the system and reveal the significant influence of key operation parameters on the system performance. The invention provides an innovative path for efficient utilization of biomass and clean production of methanol and dimethyl ether, and effectively balances resource utilization and environmental protection.

This invention relates to a method for producing phenolic compounds by pyrolysis of lignin catalyzed by a double perovskite, comprising: preparation of a MOF precursor; calcination of the MOF precursor prepared in step one to prepare a MOF-based double perovskite AA' with tunable morphology, specific surface area, and pore structure. 1‑x K x B₂O₆, where A is a rare earth metal, A' is an alkaline earth metal, and B is a transition metal, the molar ratio of the metals in MOFs-based double perovskites is A:A':K:B = 1:(1- x ): x :2, where 0.01≤ x ≤0.40; MOFs-based double perovskite catalytic pyrolysis of lignin to produce phenolic compounds, the phenolic compounds in the liquid phase product include phenols, guaiacol, and syringol, with a total selectivity ≥65%; regeneration of double perovskite. This invention utilizes double perovskite catalytic pyrolysis of lignin to produce phenolic compounds, which can convert lignin into high-value-added chemicals.

The invention discloses a lignin pre-depolymerization strengthening method based on a supercritical fluid technology, which comprises the following steps: firstly, pretreating lignin powder by using a mixed solvent of supercritical carbon dioxide and an auxiliary agent at specific temperature and pressure, and then washing and drying by using an alcohol / ketone mixed solution; and then carrying out catalytic depolymerization on the pretreated lignin in supercritical ethanol or methanol fluid by using a metal supported catalyst taking molybdenum sulfide as a carrier. According to the method, through supercritical CO2 / auxiliary agent pretreatment, the compact structure of the lignin is effectively destroyed, active sites are introduced, the reaction rate and the product yield of subsequent catalytic depolymerization are remarkably increased, and an efficient and environment-friendly new way is provided for high-value utilization of the lignin.

The application discloses a kind of lignin-based aryl formate and diaryl ether compound and synthesis method thereof, belong to the technical field of organic compound synthesis.The method uses lignin β-O-4 model compound as reaction raw material, under the condition of oxidant and alkali, after heating reaction, then join diaryl iodonium under air atmosphere and stir, obtain aryl formate and diaryl ether compound.The synthesis method of the application has the advantages of simple operation, mild reaction condition and high product selectivity, provides a new way for the preparation of aryl formate and diaryl ether compound.

This invention discloses a method for the deamination functionalization of aliphatic nitrosamines, comprising: reacting an aliphatic nitrosamine as shown in formula (II) with a nucleophile in the presence of an acid and a solvent to generate a deamination functionalized product as shown in formula (III); wherein, R 1 R 2 R 3 Each group is independently selected from hydrogen, hydroxyl, alkyl, alkoxy, alkanoyl, alkoxycarbonyl, alkylsulfinyl, alkylsulfonyl, aryl, heteroaryl, phenylalkyl, or R 1 R 2 R 3 Two or three of the functional groups form a non-aromatic ring, cage-like compound; FG is a functional group in which a nucleophile participates in the reaction. The method of this invention has the advantages of inexpensive and readily available raw materials, simple reaction conditions, and wide substrate applicability.

The invention discloses a method for preparing cyclohexyl methyl ether by catalytic conversion of phenol, and belongs to the field of high value-added chemicals prepared by biomass conversion. The process of the present invention mixes phenol and methanol according to a molar ratio of 1: (1-4), adds an oxygen content of 4.9% to 12.0%, a carbon-supported solid catalyst loaded with a noble metal, and reacts in a hydrogen environment, with a reaction temperature of 110 to 200 ° C. Using the above scheme, phenol is catalyzed into cyclohexyl methyl ether in one step, with good catalytic activity and high selectivity, and provides new ideas and methods for efficient catalytic conversion of biomass.

The present invention provides a method for producing a fluorine-containing compound by introducing a fluorine atom into a wide variety of oxygen-containing compounds having a ketone group, an aldehyde group, a hydroxy group, or the like using SF5− stabilized by forming a salt with a glyme-coordinated alkali metal ion as a deoxofluorinating agent under relatively mild conditions.The present invention pertains to a method for producing a fluorine-containing compound, the method in which a fluorine-containing compound is produced by the deoxofluorination of an oxygen-containing compound having an aldehyde group, a ketone group, a carboxy group, or a hydroxy group in one or more solvents selected from the group consisting of DMPU, G4, DMA, HMPA, and MeCN using a deoxofluorinating agent represented by a general formula (E1) [in the formula, M represents Cs+, K+, or Rb+; G4 represents a tetraethylene glycol dimethyl ether; and n represents an integer of 1 to 4].

This fullerene derivative has a structure represented by formula (1) or formula (2) (wherein Ar represents a substituted or unsubstituted aromatic ring, * represents a carbon atom at a linkage point with respect to a fullerene core, X represents O, S, Se, or Te, and R represents an organic group).

A process for producing an ether including treating (a) an ester with (b) hydrogen in the presence of (c) a heterogeneous catalyst to reduce the ester by hydrogenation to form an ether product.

The present invention relates to a method for preparing monomers via depolymerisation from lignocellulose-containing biomass.

The invention provides a preparation method of octadiene monomethyl ether and a used catalyst, the catalyst comprises a palladium-containing compound and a ligand, the ligand has a structure as shown in a formula I, substituent groups R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14 and R15 are independently selected from fluorine, methyl and hydrogen, and at least one substituent group is fluorine. According to the invention, the F atom is introduced to the substituent outside the ring of the ligand, so that the electron withdrawing capability of the ligand is enhanced, the catalytic activity of the catalyst is improved, and the requirements on reaction conditions are reduced. In addition, by introducing F atoms, the steric hindrance effect of the ligand is enhanced, and the selectivity of the catalyst can be improved.

The application belongs to the technical field of power equipment fault diagnosis, and particularly relates to a diagnostic agent suitable for overheat fault early warning of power oil-filled equipment. R The main body skeleton is in a configuration or S The main body skeleton is in a configuration or 1 R is hydrogen, aryl or alkyl; R 2 R is hydrogen, aryl or alkyl; R 2 R is alkyl. The application has the following beneficial effects: the diagnostic agent can be applied to the field of power equipment fault early warning; the early warning mechanism is based on low-energy barrier response, and early fault warning can be realized; the diagnostic principle is based on atropisomerism effect, the reaction path is clear, and a quantitative analysis model can be easily established; the diagnostic agent has good compatibility with insulating oil, insulating paper and metal materials, and does not affect normal operation of the equipment.

The present invention discloses a method for mechanochemical enzyme-coupled lignin degradation. The specific operation process is to place lignin powder, a solid-phase reagent, and zirconium oxide beads in a polytetrafluoroethylene ball mill, perform a co-grinding reaction in the ball mill, add an enzyme after ball milling, add a solvent for stirring, and reflux reaction. After the reaction, the mixture is dissolved in water and extracted with ethyl acetate. The insoluble residue is centrifuged, washed with ethyl acetate, and vacuum dried for detection and analysis. The present invention has the advantages of a short process route, low reagent usage, simple operation, low cost, low pollution, low molecular weight of the obtained product, and good degradation efficiency. It is a lignin degradation method with good promotion and application prospects.

This invention discloses a method for the kinetic resolution of oxaspirone via organocatalytic hydrogenolysis. Using chiral phosphate CPA as a catalyst, Hantzsch ester as a hydrogen source, and racemic oxaspirone 2,4-dien-6-one rac-1 as a substrate, a series of axially chiral biaryl phenolic compounds 2 are synthesized via asymmetric hydrogenolysis, and the central chiral oxaspirone 1 is recovered. This invention offers advantages such as simple and practical operation, readily available raw materials, high resolution coefficient, and good enantioselectivity. Some of the axially chiral biaryl products have structures similar to axially chiral cannabinol, possessing potential medicinal value.

The invention relates to the field of synthesis of hindered phenol antioxidant intermediates, and discloses a method for synthesizing 3, 5-di-tert-butyl-4-hydroxybenzyl methyl ether, which comprises the following steps: carrying out electrophilic aromatic substitution reaction on 2, 6-di-tert-butylphenol and formaldehyde, taking a metal-loaded ETS-10 molecular sieve as a catalyst, and reacting at the room temperature to obtain the 3, 5-di-tert-butyl-4-hydroxybenzyl methyl ether. Under normal pressure, the key hindered phenol antioxidant intermediate 3, 5-di-tert-butyl-4-hydroxy benzyl methyl ether is obtained. The metal-loaded ETS-10 molecular sieve used in the invention is simple to manufacture, convenient to operate, easy to separate and reusable; the catalytic activity of the synthesized intermediate 3, 5-di-tert-butyl-4-hydroxybenzyl methyl ether is high, the reactant conversion rate is high, and the yield is relatively high; meanwhile, production efficiency can be improved, energy consumption and cost are reduced, and the method is suitable for industrial production.

A method for producing ethers, comprising treating (a) an ester with (b) hydrogen in the presence of (c) a heterogeneous catalyst to reduce the ester by hydrogenation to form an ether product.

The invention discloses a preparation method of 1-methoxy-2-trifluoromethoxyethane, an electrolyte, a battery and a power utilization device, and relates to the technical field of batteries, the preparation method of 1-methoxy-2-trifluoromethoxyethane comprises the following steps: reacting an intermediate, dibromohydantoin and hydrogen fluoride pyridine in tetrachloroethane to obtain 1-methoxy-2-trifluoromethoxyethane; the 1-methoxy-2-trifluoromethoxyethane is subjected to a reaction to obtain the 1-methoxy-2-trifluoromethoxyethane; wherein the structural formula of the intermediate is shown in the specification. According to the preparation method of the 1-methoxy-2-trifluoromethoxyethane provided by the invention, the 1-methoxy-2-trifluoromethoxyethane can be produced, and the 1-methoxy-2-trifluoromethoxyethane can be used in an electrolyte to improve the oxidation resistance of the electrolyte.

The invention belongs to the field of fluorine chemical industry, and particularly relates to a synthesis method of 3-ethoxy-2, 4-trifluoromethyl perfluoropentane, which specifically comprises the following steps: in the presence of a solvent and a phase transfer catalyst, in a dry reaction kettle, perfluorobutyryl fluoride and carbonate form a stable intermediate, and the stable intermediate and an alkylation reagent R-C2H5 are subjected to an alkylation reaction to obtain 3-ethoxy-2, 4-trifluoromethyl perfluoropentane. The product 3-ethoxy-2, 4-trifluoromethyl perfluoropentane is obtained after the reaction is completed. According to the method disclosed by the invention, the commercial alkali carbonate is adopted as a reactant, and the yield can reach 85% by optimizing the synthesis conditions, so that the yield is greatly improved; the reaction speed is high, the reaction time is short, and complete conversion can be realized within 24 hours; meanwhile, the raw materials are easier to obtain and high in utilization rate, and industrial production is easier to realize.