269results about "Ether preparation" patented technology

Processes are disclosed for the production of liquefied petroleum gas (LPG) hydrocarbons, utilizing both alcohol (e.g., methanol) synthesis and in situ dehydration of the alcohol to hydrocarbons, and particularly propane and / or butane. Operational adjustments and / or variations, involving activation of LPG synthesis catalyst systems at relatively high temperatures, followed by initial operation at relatively low temperatures, surprisingly lead to improvements in the stability of such catalyst systems. These improvements are often in conjunction with other benefits, for example greater selectivity and / or per-pass yield, with such improvements and benefits resulting from the ability to operate at reduced temperatures. Problems typically encountered in the art due to catalyst instability, such as the need for frequent replacement and / or regeneration, are thereby potentially reduced or even eliminated.

The invention discloses a method for resource utilization of fluorine-containing waste gas in hexafluoropropylene oxide production and co-production of hydrofluoroether, which comprises the following steps of: firstly, reacting the fluorine-containing waste gas in hexafluoropropylene oxide production under the action of a fluorine ion catalytic system to generate a perfluorinated intermediate product; then, the perfluorinated intermediate product reacts with an alkylating reagent under the action of a fluorinating reagent to produce a hydrofluoroether product. Hydrofluoroether products with different structures are obtained by utilizing the characteristics of nucleophilic addition reaction of a by-product acyl fluoride and hexafluoropropylene in the production of hexafluoropropylene oxide and utilizing the characteristics of the addition product for preparing hydrofluoroether by using the same alkylation process; the hydrofluoroether products are widely applied to the fields of semiconductor temperature control fluid, data center immersion heat exchange fluid, electrified cleaning agents and inert diluents of base stations or weak current equipment and the like, and have high added value.

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 belongs to the technical field of fluorine-containing fine chemical synthesis, and particularly relates to an oxa-hydrofluoroether compound and a synthesis method and application thereof. The invention relates to an oxa-hydrofluoroether compound, the structure of the oxa-hydrofluoroether compound is shown as a formula (1): # imgabs0 #, in which Rf is F or CF3; r is methyl or ethyl; n is an integer from 1 to 3; according to the oxa hydrofluoroether compound disclosed by the invention, oxygen atoms are embedded into a fluorocarbon chain structure, so that fluorine-containing chain segments of hydrofluoroether are more diversified, and the structure is not limited by a perfluorocarbon chain structure any more; according to the oxa-hydrofluoroether compound, oxygen atoms play a role in reducing surface tension, and the more the oxygen atoms are, the lower the surface tension is; compared with other hydrofluoroether solvents, the hydrofluoroether solvent has higher permeability and better cleaning effect; according to the oxa-hydrofluoroether compound, on one hand, oxygen atoms are embedded into a fluorocarbon chain structure, and on the other hand, the fluorocarbon chain contains branched chains, so that the oxa-hydrofluoroether compound is easy to degrade, and the environmental friendliness is improved.

The invention relates to a zero-emission technology for producing power in a thermal plant using natural gas (NG) or liquefied natural gas (LNG), followed by capturing carbon dioxide (CO2) and converting it into green Dimethyl Ether (DME). The process integrates a gas-based combined cycle power plant with CO2 capture through Pressure Swing Adsorption (PSA) (106) and Monoethanolamine (MEA) purification. Captured CO2 undergoes a Reverse Water Gas Shift (RWGS) (306) reaction at temperatures above 900°C to form CO, which, along with syngas from steam methane reforming (308a, 308) at 525°C to 900°C and 25 ATA pressure, is converted into DME using a Cu / ZnO / Al2O3 catalyst at 250-300°C and 25-40 ATA. The process achieves an energy efficiency factor of 93.04%, producing 92 kg of DME per 48 kg of LNG, with a 94% greenhouse gas abatement, contributing to net-zero emissions (NZE) while generating bulk thermal power.

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 provides a continuous production method of chloromethyl ethyl ether, and relates to the field of chloromethyl ethyl ether. The continuous production method of the chloromethyl ethyl ether comprises the following steps: depolymerization, first-stage gas-liquid reaction, second-stage microchannel reaction and third-stage pipeline reaction. The continuous production method of chloromethyl ethyl ether effectively avoids the defects of low hydrogen chloride throughput, long reaction time and low production efficiency in the batch-type reaction process, and overcomes the problems of low mass transfer efficiency, low reaction speed and high production energy consumption of heterogeneous reaction of paraformaldehyde, ethanol and hydrogen chloride gas; and on the basis of realizing continuous production of the chloromethyl ethyl ether, the purity and the yield of the continuously prepared chloromethyl ethyl ether are further improved.

The utility model belongs to the technical field of reaction devices, and is particularly a reaction device for catalytic production of vinyl ether, comprising a reactor and a driving motor, wherein the driving motor is installed on the upper side of the reactor, and a main stirring rod is arranged inside the reactor, and the output shaft of the driving motor is fixed to the upper end of the main stirring rod. The reaction device for catalytic production of vinyl ether starts the driving motor, and the output shaft of the driving motor drives the main stirring rod to rotate, and the second bevel gear drives the auxiliary stirring rod to rotate, so that the raw materials and the catalyst can be mixed more evenly in the vertical direction, the mixing degree is improved, and the reaction rate of the reaction device for catalytic production of vinyl ether is accelerated, and the screw is rotated so that the baffle can stably move up along the inner side of the solid feed pipe, and then the baffle is moved away from the top of the solid feed pipe, so that the reaction device for catalytic production of vinyl ether is convenient for adding raw materials and catalysts.

The invention provides a bissanthin aromatic ring bay region C-H nucleophilic substitution reaction method and application thereof, and belongs to the field of organic synthesis methodology. According to the reaction, bissanthin is used as a raw material, dichloromethane and acetonitrile are used as solvents, and the bissanthin is oxidized by nitrite hexafluorotellurate and respectively reacts with nucleophilic reagents such as carbon anions, oxygen-containing reagents, sulfur-containing reagents, chlorine-containing reagents, nitrogen-containing reagents, phosphorus-containing reagents and cyano groups in one step to synthesize a series of bissanthin bay area modified functionalized products; when the reaction method is further applied to the nucleophilic substitution reaction of two molecules, namely perylene (Perylene) and N, N '-di (1, 3-diisopropyl benzene)-3, 4, 9, 10-perylene dicarboximide (PDI), good universality is shown, and the reaction method can be applied to the nucleophilic substitution reaction of two molecules, namely perylene (Perylene) and N, N'-di (1, 3-diisopropyl benzene)-3, 4, 9, 10-perylene dicarboximide (PDI). The method is mild in reaction condition, does not need to introduce transition metal as a catalyst, is easy in product separation and purification, and has the advantages of low cost, high efficiency and greenness; the series of functionalized derivatives constructed by the method can provide important intermediates for synthesis of larger polycyclic aromatic hydrocarbon molecules of the system; the method has a good industrial production prospect.

The invention discloses a method for catalytically depolymerizing a lignin derivative and lignin depolymerized oil. The invention relates to a method for preparing lignin depolymerized oil rich in 1, 2-diphenylethyl structure bisphenol and lignin oligomer by a lignin derivative containing a 1, 1-diphenylmethyl structure under the synergistic catalysis of a transition metal catalyst, a hydrogen donor and an acid catalyst in a liquid medium. Directional depolymerization of lignin is realized by catalyzing aryl migration reaction of a 1, 1-benzhydryl structure, and different from traditional reaction taking lignin monophenol as a target product, one-step directional preparation of a bisphenol product and co-production of a lignin oligomer can be realized. According to the method disclosed by the invention, the product type of lignin-based bisphenol is expanded, and the application of catalytic depolymerization of lignin to preparation of high-value chemicals, fuels and polymer materials is promoted.

A method includes heating a steam feed stream received from a reactor unit in a first heat exchanger using an anode effluent from an anode of an electrolyzer comprising an anode, a cathode, and an electrolyte inserted between the anode and the cathode as a heat transfer medium to generate a first heated steam effluent and a cooled anode effluent, heating the first heated steam effluent in a second heat exchanger using a cathode effluent from the cathode of the electrolyzer as a heat transfer medium to generate a second heated steam effluent and a cooled cathode effluent, and converting the second heated steam effluent to a third heated steam effluent for use in the cathode of the electrolyzer.

A method includes heating a steam feed stream received from a reactor unit in a first heat exchanger using an anode effluent from an anode of an electrolyzer as a heat transfer medium to generate a first heated steam effluent, heating the first heated steam effluent in a second heat exchanger using a cathode effluent from a cathode of the electrolyzer as a heat transfer medium to generate a second heated steam effluent, combusting, in a combustion unit, a first tail gas stream to transfer heat to the second heated steam effluent to generate a third heated steam effluent, and passing the third heated steam effluent to the cathode of the electrolyzer.

A method includes heating a steam feed stream received from a reactor unit in a first heat exchanger using an anode effluent from an anode of an electrolyzer as a heat transfer medium to generate a first heated steam effluent, heating the first heated steam effluent in a second heat exchanger using a cathode effluent from a cathode of the electrolyzer as a heat transfer medium to generate a second heated steam effluent, combusting, in a combustion unit, a first tail gas stream to transfer heat to the second heated steam effluent to generate a third heated steam effluent, and passing the third heated steam effluent to the cathode of the electrolyzer.

The invention discloses a fullerene C60 tetra-addition derivative as well as a preparation method and application thereof. The structure of the fullerene C60 tetra-addition derivative is shown as a formula I. The specific preparation method comprises the following steps: under the protection of inert gas, taking fullerene C60, tetrabutyl ammonium hydroxide hydrate, benzyl bromide and a TBAOH methanol solution as raw materials, taking o-dichlorobenzene or methylbenzene as a solvent, and reacting at 60-80 DEG C to obtain the target fullerene C60 tetra-addition derivative. The preparation method of the fullerene C60 tetra-addition derivative has the advantages of simple operation steps, safety, easiness in control, high selectivity and the like. A photovoltaic device prepared by using the fullerene derivative as an acceptor material has high open-circuit voltage, and is a very potential photovoltaic material. # imgabs0 #

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.

The invention discloses a method for preparing 4-propyl syringol by catalyzing hydrogenolysis of lignin through cobalt-nitrogen co-doped porous carbon. According to the method, organic soluble lignin is taken as a raw material, lignin-based cobalt-nitrogen co-doped porous carbon is taken as a catalyst, small molecular alcohol is taken as a reaction medium, stirring reaction is performed under the hydrogen pressure of 1-2MPa and at the temperature of 190-260 DEG C, and the organic soluble lignin is selectively hydrogenolyzed into a monophenol chemical mainly containing 4-propyl syringol; the catalyst disclosed by the invention does not need to be subjected to carrier preparation, impregnation and reduction, and also does not need to be subjected to mofs material preparation and roasting, so that the catalyst has obvious advantages in a catalyst preparation process; according to the catalyst, transition metal is used as catalytic active metal, and the metal is uniformly dispersed on the surface of the catalyst in a monatomic-level dispersion degree to form a complex with CoN4 as a main component with carbon and nitrogen; the catalyst is wide in raw material source, low in metal content and obvious in cost advantage, and has the advantage of large-scale production.

Disclosed is a method for catalytic depolymerization of lignin to prepare a monophenolic chemical product using a zeolitic imidazolate framework derivative. The method uses lignin as raw material, a zeolitic imidazolate framework derivative as catalyst, and an organic small molecule alcohol as hydrogen-donating solvent. After inert gas displacement and pressurization to 0.5-3 MPa, the reaction temperature is controlled to be 200-240°C, and stirring is performed for 2-10 h, which can achieve selective depolymerization of lignin without added hydrogen, yielding monophenolic chemical products mainly composed of 4-propyl-2,6-dimethoxyphenol. The method of the present invention is environmentally friendly, has stable performance, has highly efficient catalysis, and is highly selective, realizing selective conversion of lignin into monophenolic chemical products mainly composed of 4-propyl-2,6-dimethoxyphenol under conditions without added hydrogen.

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 invention discloses a method for synthesizing heptafluoro-n-propyl ether by taking hexafluoropropylene oxide as a raw material. The method comprises the following steps: with hexafluoropropylene oxide as a raw material, carrying out a ring-opening reaction under the action of a supported metal catalyst to obtain perfluoropropionyl fluoride; and mixing the perfluoropropionyl fluoride with inorganic fluoride, and then adding an aprotic polar solvent and an alkylating reagent to carry out alkylation reaction, thereby obtaining the perfluoropropionyl fluoride. The active metal of the supported metal catalyst comprises at least one of Ni, Fe, Co and Cu; a carrier of the supported metal catalyst is modified lignocellulose biochar. The supported metal catalyst is adopted to synthesize the perfluoropropionyl fluoride intermediate product, the reaction efficiency is improved, the reaction conditions are milder, the yield and purity of the obtained intermediate product are high, and the heptafluoro-n-propyl ether product continuously synthesized by adopting the intermediate product is high in yield and good in quality. The method greatly reduces the production cost of hydrofluoroether, and is simple in process and suitable for industrial production.

The invention discloses a method for preparing guaiacol monomer products by catalyzing selective hydrogenolysis of lignin through aluminum oxide loaded nickel and nickel-tin alloy. The catalyst simultaneously containing metal nickel and nickel-tin alloy active phases is prepared by adopting a urea precipitation method, organic soluble lignin is taken as a raw material, a mixture of alcohol substances and water is taken as a solvent, and the aluminum oxide loaded metal nickel and nickel-tin alloy catalyst prepared by adopting the urea precipitation method is added; and replacing air in the reaction kettle with inert gas, pressurizing to 1.0-3.0 MPa, and stirring at 210-270 DEG C for 1-6 hours to convert the organic soluble lignin into a compound mainly comprising guaiacol monomer products with high selectivity. The catalyst is simple in preparation process and low in cost, the lignin depolymerization reaction has the advantages of mild conditions, safe operation process and the like, and the obtained guaiacol product can be used for preparing chemicals such as food additives or medical intermediates.

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.

The present invention relates to the technical field of nanopharmaceuticals, and in particular to a preparation method and application of fluorinated lipid nanoparticles. The preparation method of the fluorinated lipid nanoparticles comprises: dissolving fluorinated lipids and four commercial lipid molecules in anhydrous ethanol to obtain an ethanol phase lipid solution; dissolving nucleic acid in a citric acid buffer to obtain an aqueous phase nucleic acid solution; then uniformly mixing the ethanol phase lipid solution and the aqueous phase nucleic acid solution at a ratio of 1:3, and purifying the mixture through a desalting chromatography column to obtain the fluorinated lipid nanoparticles of the present invention. Compared with commercial transfection reagents and conventional lipid nanoparticles, the nanoparticles can significantly improve their nucleic acid delivery performance and transfection efficiency.

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.

The invention discloses a synthetic method of a substituted trans-dicyclohexyl alkenyl liquid crystal monomer, which comprises the following steps: reacting 4, 4 '-dicyclohexyl ketone with chloromethyl ether phosphine salt and potassium tert-butoxide at-10 DEG C to 0 DEG C to form 4, 4'-dicyclohexyl diene methyl ether; reacting with hydroxylamine hydrochloride under the action of a first catalyst to generate 4, 4 '-dicyclohexyl dioxime; under the action of a second catalyst, carrying out unilateral deprotection to generate 4-oxime 4 '-dicyclohexylformaldehyde; the preparation method comprises the following steps: reacting 4-oxime with R1BrPPh3 and potassium tert-butoxide at the temperature of 10 DEG C below zero to 0 DEG C to obtain 4-oxime 4 '-dicyclohexyl alkyl ethylene; reacting with formic acid to generate 4-formaldehyde-4 '-dicyclohexyl alkyl ethylene; the substituted trans-dicyclohexyl alkene liquid crystal monomer is prepared by reacting the substituted dicyclohexyl alkene with R2BrPPh3 and potassium tert-butoxide at the temperature of-10 DEG C to 0 DEG C to obtain a cis-trans mixture and carrying out transposition. The method comprises seven steps of reaction, transposition and purification are not needed in the early stage, transposition crystallization is only needed in the last step, and the total yield can reach 70% or above. The raw materials are cheap, easily available and low in cost.

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.