1209results about "Carboxylic compound preparation" patented technology

To provide a fluorinating agent that can be produced using a simple method, and a fluorination method that uses a fluorinating agent that can be produced using a simple method.SOLUTION: The present disclosure provides a fluorinating agent that comprises a fluorine-containing compound and fluoride ions.SELECTED DRAWING: None

The invention relates to the field of biomass energy and chemical industry, in particular to an efficient methanol preparation method based on biomass graded catalytic conversion and cycle coupling. The method comprises the following steps: in a graded catalytic oxidation reaction system, mixing a biomass raw material with a composite vanadium-based catalyst, water, oxygen and circulating methanol for reaction to generate a gas-liquid mixture containing methyl formate; recycling methyl formate by using a gradient variable-pressure rectification separation system; carrying out an interface hydrogenation reaction under the action of a copper-zinc-LTA hierarchical pore catalyst to generate methanol; finally, part of methanol is purified and recycled through membrane separation. The method realizes efficient conversion from biomass to methanol, has the advantages of mild reaction conditions, low energy consumption, high yield and good catalyst stability, and opens up a new path for industrialization of preparation of methanol from biomass.

The invention belongs to the field of preparation of halogen-containing substituted benzoic acid, and particularly relates to a method for preparing o-chlorobenzoic acid through hydrogenation selective debromination. According to the invention, hydrogen is used as a reducing agent, a palladium catalyst is used as a catalyst, a methanol aqueous solution is used as a solvent, and 2-chloro-3-bromobenzoic acid, 2-chloro-5-bromobenzoic acid or a mixture thereof are used as raw materials to prepare o-chlorobenzoic acid. According to the method, debromination is controlled through selective hydrogenation instead of dechlorination, so that generation of a byproduct benzoic acid is inhibited. The scheme is reasonable in design, simple in process and mild in reaction condition, and a new thought is provided for the synthesis method of o-chlorobenzoic acid.

The invention relates to a catalyst for acrylic acid synthesis and a preparation method thereof, and belongs to the technical field of catalysts, and the preparation method of the catalyst for acrylic acid synthesis comprises the following three steps: preparing catalyst active component powder, dipping and loading, and drying and roasting. According to the catalyst for acrylic acid synthesis, the conversion rate of acrolein is 98.1-99.7%, the yield of acrylic acid is 97.9-99.3%, and the hot-spot temperature is 225-235 DEG C.

The invention belongs to the technical field of photocatalytic oxidation of gaseous alkanes, and particularly relates to a method and system for photocatalytic oxidation of gaseous alkanes, and the method comprises the following steps: under illumination, enabling a photocatalyst, bubbles containing gaseous alkanes and chlorine-containing active substances to react at an interface of a two-phase system containing an organic phase and a water phase to generate an oxidation product, the oxidation product comprises one or more of acid, alcohol and aldehyde, and the organic phase can dissolve the chlorine-containing active substance. The method provided by the invention is beneficial to improving the generation rate of oxidation products and the apparent light quantum efficiency of photocatalytic reaction.

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.

The invention discloses a method for producing formic acid by reducing carbon dioxide through a hydrogen-driven hollow fiber catalytic membrane reactor, and relates to the technical field of carbon dioxide resource utilization. In order to solve the problems of low formic acid product selectivity, low CO2 conversion efficiency and high cost in the prior art, hydrogen is used as the only energy source, and a hollow fiber non-porous membrane is utilized to realize bubble-free efficient mass transfer of H2 to form a compact hydrogen-rich layer on the surface; the nano-metal particle catalyst loaded on the surface of the membrane synergistically activates hydrogen at a gas-liquid-solid three-phase interface to generate active hydrogen atoms, and CO2 transferred in a dissolved state or a gas phase is subjected to directional catalytic reduction to form formic acid with high selectivity. The method is operated at normal temperature and normal pressure, so that the H2 utilization efficiency and the CO2 mass transfer efficiency are remarkably improved, and the byproduct separation cost and the operation energy consumption are effectively reduced; the produced formic acid can be used as an important chemical raw material and intermediate, an excellent liquid hydrogen storage carrier, a formic acid fuel cell fuel and a microbial carbon source, and has wide application value.

The present invention provides a photolysis base and a preparation method thereof, a patterned material, a patterned film, an electronic device and a preparation method thereof, the photolysis base comprising an anion represented by formula 1, and the present application is helpful to improve the resolution of a photoresist and reduce line width roughness (LWR) at the same time.

The invention discloses an oxidation kettle and a method for preparing an isocaprylic acid intermediate product sodium isocaprylate, the oxidation kettle comprises a kettle body and a jacket fixedly sleeved outside the circular outer part and the bottom end of the kettle body, a sealing seat is arranged at the center of the top end of the kettle body, a speed reducer is fixed at the top end of the sealing seat through a flange and a screw, and a speed reduction shaft of the speed reducer penetrates through the sealing seat; a speed reducer is arranged in the kettle body, the top end of the speed reducer is in transmission connection with a stirring motor, the stirring motor is electrically connected with an external power supply through an electric wire, and a stirring shaft is vertically arranged at the center of the kettle body. According to the device, the stirring effect on fluid in the kettle body can be enhanced through automatic up-down swinging of the metal stirring rollers, synchronous swinging of the multiple stirring rollers is achieved through the linkage mechanism, stable and controllable swinging action is ensured through the driving mechanism, the mixing uniformity and reaction efficiency of materials in the oxidation kettle are remarkably improved, and the production cost is reduced. And the stirring requirements of high-viscosity and easily-layered materials are met. The oxidation kettle can be used for preparing an isocaprylic acid intermediate product sodium isocaprylate.

Acrolein is produced by selectively oxidizing allyl alcohol over a first mixed metal oxide catalyst in the presence of oxygen in the vapor phase. The first mixed metal oxide catalyst comprises oxides of molybdenum and bismuth. Acrylic acid is produced by selectively oxidizing the acrolein over a second mixed metal oxide catalyst in the presence of oxygen in the vapor phase. The second mixed metal oxide catalyst has a different composition from the first mixed metal oxide catalyst.

The invention discloses a method for preparing glyceric acid by catalytically oxidizing glycerol with a non-noble metal catalyst, which comprises the following steps of: catalytically oxidizing glycerol under the action of oxygen by taking a CuZrOx composite oxide as a catalyst to obtain glyceric acid; wherein the CuZrOx composite oxide is prepared by a deposition-precipitation method through high-temperature calcination. The internal structure of the catalyst is changed due to introduction of Cu, two metal components are combined more tightly and have strong interaction due to doping of Cu, and meanwhile, compared with a single-metal catalyst, the number of oxygen vacancies of the composite oxide catalyst is increased, the number of strongly acidic sites and strongly basic sites on the surface is increased, and the catalytic activity of the catalyst is improved. According to the present invention, the catalyst has a certain acid-base property so as to produce the good catalysis effect, such that the high glycerol conversion rate and the high glyceric acid selectivity are achieved while the production cost is reduced, and the catalyst can be repeatedly used.

To provide a method for producing a catalyst for synthesizing an unsaturated carboxylic acid and a catalyst capable of increasing selectivity and yield of an unsaturated carboxylic acid obtained even at low reaction temperatures.SOLUTION: There is provided a method for producing a catalyst for synthesizing an unsaturated carboxylic acid, which comprises: a solution preparation step of dissolving and / or dispersing a supply source compound of a plurality of catalyst component elements containing molybdenum and a sulfur-containing inorganic compound in an aqueous liquid to obtain a starting raw material mixed solution; a first powdering step of drying the starting raw material mixed solution to obtain a first powder; a drying step of heat-treating the first powder to obtain a dried product; and a molding step of forming the dried product into a second powder, followed by forming into a catalyst precursor, wherein the ratio of the difference between the loss on ignition of the second powder at 500°C and the loss on ignition of the second powder at 250°C to the difference between the loss on ignition of the first powder at 500°C and the loss on ignition of the first powder at 250°C is in the range of 0.4% or more and 45% or less.SELECTED DRAWING: Figure 1

The invention relates to the technical field of equipment temperature control, in particular to a 12-hydroxystearic acid production reaction temperature control method based on artificial intelligence, and the method comprises the following steps: calculating a reaction heat release index based on the hydrogen feeding instantaneous molar flow at the current moment so as to represent theoretical heat generated through chemical reaction in unit time; based on the output power of the stirring motor at the moment and fluid mechanics characteristics, a viscosity correction factor used for representing the heat transfer capacity attenuation degree caused by the material viscosity change is constructed; in combination with the reaction heat release index and the viscosity correction factor at the current moment, performing energy compensation and nonlinear correction on the actually measured temperature in the kettle at the current moment to obtain a target predicted temperature; the control of the 12-hydroxystearic acid production reaction temperature is realized based on the target predicted temperature at the current moment, and the accuracy of the control of the 12-hydroxystearic acid production reaction temperature can be effectively improved.

The invention relates to a method for recycling polyethylene plastic through catalytic oxidation cracking, and belongs to the technical field of plastic recycling. The method comprises the following steps: mixing a Co / Al2O3 catalyst, polyethylene plastic and water, and carrying out a catalytic reaction in an oxygen-containing atmosphere at a set temperature, so that the polyethylene plastic is converted into binary acid, thereby obtaining a reaction solution. The low-price Co / Al2O3 catalyst is applied to catalytic oxidation cracking of the polyethylene plastic, the polyethylene plastic is converted into the binary acid, the yield of the binary acid is stabilized at 70% or above and reaches 115% at most, and the Co / Al2O3 catalyst is low in price and low in cost. The low-cost and low-energy-consumption improvement of the yield of the binary acid converted from the polyethylene plastic through catalytic oxidation cracking is fully realized, and a new way is provided for the high-value conversion of the polyethylene plastic.

The invention belongs to the field of catalytic materials, and particularly discloses a high-dispersion noble metal-transition metal composite catalyst for catalyzing oxygen to oxidize methane to prepare acetic acid. The catalyst is prepared by a two-step synthesis method. The preparation method comprises the following steps: firstly, mixing and stirring a transition metal solution and an oxide to an anhydrous state by utilizing an initial wet impregnation method, and then drying and calcining to obtain a transition metal-loaded oxide carrier; then mixing a precious metal chlorate solution with the obtained transition metal loaded oxide carrier, adjusting a certain pH value, stirring and aging at a proper water bath temperature for a certain time, and then filtering, drying and calcining to obtain the catalyst. The noble metal and the transition metal loaded on the catalyst are both in a high-dispersion state, the high-selectivity preparation of acetic acid by directly oxidizing methane with oxygen can be realized under the mild condition of 120-240 DEG C, and the selectivity is as high as 99%. The preparation method of the catalyst is simple in process, green, free of pollution, high in metal active center utilization rate and low in price.

The invention provides a catalyst for synthesizing acrylic acid by selective oxidation of acrolein and a preparation method thereof, the catalyst for synthesizing acrylic acid by selective oxidation of acrolein comprises an inorganic binder, a carrier and an active component, the inorganic binder is selected from one or more of SiO2 or Al2O3; the carrier is silicon carbide powder; the general formula of the active component is Mo < 12 > V Fe X < c > O < g >; wherein X is halogen, and a ranges from 0.2 to 12; b is 0.1 to 6; c is 0.1 to 1; g is the mole number of oxygen atoms required by the total valence of elements except oxygen in the general formula. The catalyst provided by the invention has the advantages of simple metal composition, easily available raw materials, low price, uniform catalyst structure, good repeatability, high acrylic acid yield and long service life.

The invention provides a water-heat-resistant and acid-resistant catalyst for efficiently catalyzing polyol oxidation as well as a preparation method and application of the catalyst, and relates to the technical field of polyol oxidation catalysts. The hydrothermal-resistant and acid-resistant catalyst for efficiently catalyzing oxidation of polyol comprises a main active component, an auxiliary agent and a modified carrier, the main active component is at least one of Au, Pt and Pd; the auxiliary agent is at least one of Mn, Fe, Co, Ni, Cu, Sb and Bi; the carrier is at least one of SiO2, Al2O3, a TS-1 molecular sieve, a ZSM-5 molecular sieve and activated carbon. According to the invention, the activity and stability of the catalyst are enhanced by modifying the catalyst carrier and adding specific types of auxiliaries, so that the catalyst has excellent hydrothermal resistance and acid resistance. The raw materials of the catalyst are easy to obtain, the preparation process is simple, the reaction process is environment-friendly, and the catalyst is convenient to recycle, can be repeatedly used and shows a good industrial application prospect.

The invention discloses a non-noble metal catalyst, a preparation method thereof and application of the non-noble metal catalyst in preparation of acetic acid through methane oxidation, and belongs to the field of direct conversion and utilization of methane. The active metal of the catalyst is transition non-noble metal MnOx, and the carrier is an MFI type molecular sieve (ZSM-5). The catalyst can directly react methane and oxygen at low temperature to prepare acetic acid without adding a co-reducing agent and carbonylation raw materials (such as H2 and CO). The nanometer MnOx catalyst has the advantages of mild reaction conditions, high acetic acid selectivity and the like, the acetic acid selectivity can reach 81.8%, and the nanometer MnOx catalyst shows good recycling stability.

The invention discloses a preparation method of a ferrocerium / molecular sieve catalyst and an application of the ferrocerium / molecular sieve catalyst in preparation of acetic acid by mild oxidation of methane, and the specific preparation method comprises the following steps: taking metal cerium, ferric salt and a microporous molecular sieve as raw materials, dipping, drying and calcining to prepare the ferrocerium / molecular sieve catalyst. The preparation method is simple in process, easy to implement, simple, convenient and safe to operate, process parameters are easy to control, and active metal cerium and iron in the obtained cerium-iron / molecular sieve catalyst are anchored in micropore channels of a molecular sieve in a monodisperse cation state, so that the cerium-iron / molecular sieve catalyst can selectively oxidize small molecules such as methane and carbon monoxide under mild conditions; and the preparation of high-yield acetic acid chemicals is realized, few byproducts are produced, and large-scale production can be realized.

The invention discloses a device and a method for high-shear reinforced continuous synthesis of glyoxylic acid. The device comprises a first liquid storage bottle, a second liquid storage bottle, a continuous high-shear mixer and an intermittent high-shear mixer, the first liquid storage bottle and the second liquid storage bottle are connected with a feeding hole of the continuous high-shear mixer; the continuous high-shear mixer is connected with the intermittent high-shear mixer; the continuous high-shear mixer comprises a first feed port, a second feed port, a distributor, a rotor, a stator, a discharge port and a shell, the distributor, the rotor and the stator are arranged in the shell, the rotor is arranged outside the distributor, and the stator is arranged outside the rotor. According to the continuous high-shear mixer, high-speed shear force is generated through a rotor-stator structure to crush reactants into micron / nano-scale liquid drops, the liquid-liquid contact area is greatly increased, and efficient mass and heat transfer is achieved. Intermittent high shear further optimizes mixing, ensures efficient reaction, and improves the purity of the final product.

The invention relates to the technical field of polymer synthesis and application, and particularly discloses novel phenolic amide based on cardanol as well as a preparation method and application of the novel phenolic amide. The preparation method of the novel phenolic amide based on cardanol comprises the following steps: cooling 15C cardanol at a low temperature, reacting through mixed gas of O3 and O2 to obtain 8C carboxyl phenol, reacting with a first amine component to obtain modified cardanol amide, mixing and stirring the modified cardanol amide and a second amine component, adding an aldehyde component, and reacting to obtain the novel phenolic amide based on cardanol. The novel phenolic amide based on cardanol can be used as an epoxy resin curing agent and has the characteristics of high amine value, low viscosity and quick drying, and a formed paint film has good appearance and excellent application performance.

The invention discloses a nano noble metal-based oxidation catalyst as well as preparation and application thereof, and belongs to the technical fields of preparation of nano catalysts and catalytic conversion of biomass derivatives. The nano noble metal-based oxidation catalyst comprises a core-shell structure as a carrier and nano noble metal particles (such as Pt) loaded on the core-shell structure; wherein the core-shell structure takes a cerium-based oxide as a core and takes a metal oxide as a shell; pt is loaded on the surface of the cerium-based oxide. When the catalyst is used for catalyzing glycerol oxidation to prepare glyceric acid, high glycerol conversion rate (as high as 90%) and high glyceric acid selectivity (as high as 99%) under an alkali-free condition can be realized.

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 relates to a suzertraline intermediate as well as a preparation method and application thereof, and particularly provides a suzertraline intermediate 3, 4-difluoro-2-methoxyphenylacetic acid compound and a preparation method thereof, and the suzertraline intermediate can be used for preparing 3, 4-difluoro-2-methoxyphenylacetic acid. Specifically, 2, 3, 4-trifluoronitrobenzene which is low in price and easy to obtain serves as a starting raw material, 3, 4-difluoro-2-methoxyphenylacetic acid is prepared through a substitution reaction, a methylation reaction, a reduction reaction, a Meerwein arylation reaction and a hydrolysis reaction, the method is mild in reaction condition, a reaction substrate better meets the economic and environment-friendly requirements, reaction operation and a post-treatment process are safe and simple, and the method is suitable for industrial production. The purification steps are simple and convenient, byproducts are few, a target product with high purity can be obtained conveniently, corrosion to equipment is small, special equipment is not needed, and the method is suitable for industrial production.

The invention belongs to the technical field of catalysts, and particularly relates to a metal catalyst for oxidative depolymerization of industrial lignin as well as a preparation method and application of the metal catalyst. By controlling synthesis conditions, the alpha-Fe2O3 carrier with a small particle size and a high defect state is obtained, the specific surface area of the catalyst and the exposed number of surface active sites are effectively increased, and the reaction activity and reaction rate of the catalyst are remarkably enhanced. And secondly, Co / alpha-Fe2O3-D, Mn / alpha-Fe2O3-D and Cr / alpha-Fe2O3-D catalysts are prepared by adopting an atomic layer deposition method, so that the metal dispersibility and the interface synergistic effect are effectively improved, the catalysts are endowed with excellent structural stability and sulfur poisoning resistance, and the catalyst is suitable for desulfurization and efficient catalytic conversion of industrial lignin under harsh reaction conditions such as high temperature and high pressure. Experimental results show that after 8 hours of reaction, the depolymerization rate of lignin can reach 60%, the conversion rate of high-added-value products of aromatic aldehyde and aromatic acid exceeds 40%, and the overall performance is obviously superior to the existing similar technical level.

The invention discloses a sandwich structure catalyst for preparing adipic acid through cyclohexene oxidation based on a metal organic framework material, and belongs to the technical field of chemical synthesis, the structure of the catalyst is as follows: magnetic iron oxide nanospheres are loaded with heteropolyacid nanodots, and the outer layer is coated with a porous metal organic framework shell. The catalyst has excellent magnetic recovery performance, large specific surface area and open pore channels, and has the advantages of high catalytic activity, easy recovery, stable structure and the like. The excellent performance shows that the sandwich structure catalyst has important application value in reactions for preparing adipic acid through cyclohexene oxidation and the like.

To provide novel dicarboxylic acids excellent in heat resistance and optical characteristics.SOLUTION: A novel dicarboxylic acid represented by the following formula (I) or a derivative thereof is produced by a coupling reaction between a compound having a fluorene skeleton and a compound having a condensed tetra- to hexacyclic arene ring skeleton. (In the formula, ring Z1a and ring Z1b each represent a tetra- to hexacyclic arene ring; R1a, R1b, R2a and R2b each represent a substituent; k1 and k2 each represent an integer of 0 or more; A1a and A1b are the same as or different from each other and each represent a linear or branched alkylene group; and n1 and n2 each represent an integer of 0-3.)SELECTED DRAWING: None

The present invention relates to a method for decomposing peracetic acid using a metal compound and a method for culturing microorganisms using the decomposition method. The cultivation of microorganisms using the method of the present invention allows an effective removal of the peracetic acid used in a culture medium for sterilization.

The application discloses a kind of ruthenium grafting manganese aluminum hydrotalcite and catalytic method for C02 hydrogenation preparation formic acid, belong to catalyst technical field, in the application, under the optimized reaction condition, with methanol:water mixture as solvent (5:1), total pressure is 60bar, 60 DEG C, reaction 24 hours, with temperature controller to be heated to the temperature required for reactor.When the temperature inside the reactor reaches the specified temperature, start stirring at a fixed stirring speed (200-800 revolutions / min), after the required reaction time, stop stirring and heating, and allow the reactor to cool to room temperature. The hydrogenation products were analyzed by high performance liquid chromatography, the conversion number (TON) of formic acid reached more than 8000; RuMnAl-LDH was prepared by coprecipitation method, and RuMnAl hydrotalcite catalyst was obtained by heating and activation in a muffle furnace. The preparation process is simple, and the raw materials are easy to obtain. The RuMnAl-LDH catalyst prepared by the application has good catalytic activity and stability in the catalytic hydrogenation of formic acid to formic acid reaction, and has wide application prospect.

The present invention relates to the field of photocatalytic alcohol oxidation, and more particularly to a TiO2 / NaBr photocatalytic system for selectively oxidizing primary alcohols to produce acids under mild conditions. The present invention utilizes TiO2 as a primary catalyst and a halide salt as a co-catalyst. In an organic solvent, a primary alcohol raw material is added, and the system is developed in situ under oxygen and blue LED visible light. This photocatalytic system can efficiently complex with primary alcohol compounds. At room temperature, under the pressure of an oxygen balloon, and using ethyl acetate as the reaction solvent, it can oxidize the hydroxyl groups in aromatic and aliphatic primary alcohols to the corresponding acids. This method offers the advantages of good product selectivity, high conversion efficiency, and mild conditions. Furthermore, the catalyst is easily recyclable and the production cost is low. This method is a successful example of the photocatalytic oxidation of the biomass alcohol platform compound n-butanol to n-butyric acid.