1790results 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 discloses a catalyst for preparing acrolein and acrylic acid through selective oxidation of propylene, a preparation method of the catalyst and a preparation method of acrolein and acrylic acid. The general formula of the catalyst is MoBiaFebXcYdZePfOj, X is selected from at least one of Mg, Co, Ni, Ca, Cu, Zn and Mn, Y is selected from at least one of Nb, Sb and W, and Z is selected from at least one of K, Rb, Na, Li and Cs. The catalyst is used for preparing acrolein and acrylic acid through olefin oxidation, especially propylene oxidation, has the advantage of high total yield of acrolein and acrylic acid, and is good in structural stability.

The invention discloses a modified LaMnO3 perovskite oxide catalyst as well as a preparation method and application thereof, and belongs to the field of catalyst modification. The preparation method of the modified LaMnO3 perovskite oxide catalyst comprises the following steps: (1) preparing the LaMnO3 perovskite oxide; and (2) carrying out acid etching treatment and heat treatment on the LaMnO3 perovskite oxide, and obtaining the LaMnO3 perovskite oxide after the acid etching treatment and the heat treatment are finished. According to the method, perovskite oxide is modified in an etching mode, the LaMnO3 perovskite oxide catalyst with high catalytic activity and high stability is synthesized by adding a heat treatment process, the LaMnO3 perovskite oxide catalyst is used in the process of preparing benzoic acid through methylbenzene solvent-free oxidation, no chlorine element is introduced, and the prepared high-quality benzoic acid can be widely applied to medical treatment and food. When the catalyst is used in a reaction for preparing benzoic acid through selective oxidation of toluene, the conversion rate of toluene can reach 24.8%, the selectivity of benzoic acid can reach 82.7%, and the catalyst has good activity and selectivity.

The invention provides a synthesis method of acetoxyacetyl chloride, and belongs to the field of medical intermediates and fine chemical engineering. The preparation method comprises the following steps: mixing glycolic acid and acetyl chloride for first reaction; then adding trichlorotoluene and a catalyst to carry out a second reaction; and rectifying and separating to obtain the product acetoxyacetyl chloride. According to the method, two raw materials react to generate two products, no sulfur dioxide or acidic mixed waste gas is generated, the utilization rate of the raw materials reaches 100% theoretically, and the method completely conforms to an environment-friendly and pollution-free green process. The safety of the used trichlorotoluene is far higher than that of thionyl chloride and phosgene, the reaction is mild, the reaction speed can be controlled by controlling the temperature and the input amount of the catalyst, the production operation is relatively safe, and the purity of the prepared acetoxyacetyl chloride product is greater than 99% and the yield is greater than 92%.

The invention discloses a catalyst for catalyzing ethane to prepare ethylene or an oxygen-containing compound as well as a preparation method and application of the catalyst, and belongs to the field of catalysts. On the basis of ERB-1 and MCM-22, a large number of hydroxyl structures are formed through post-treatment of nitric acid or ammonium nitrate; a titanium source and molecular sieve silicon hydroxyl are subjected to a dehydrohalogenation reaction in a titanium halide gas form to form a Ti-O-Si bond, so that titanium successfully enters a molecular sieve framework and is uniformly distributed. Au or Pd is anchored by a framework Ti, Au or Pd is loaded by using a deposition-precipitation method, and the introduced Ti species can provide a better environment for further dispersing Au or Pd by changing isoelectric points on the surface of a molecular sieve carrier, so that the size of Au or Pd nanoparticles is controlled; secondly, due to the high specific surface area of the MWW molecular sieve, the gold precursor can be effectively dispersed, and agglomeration is inhibited; compared with an MWW molecular sieve of pure Si, Au or Pd nanoparticles can be dispersed and anchored by introducing a framework Ti, so that an Au and Pd-based catalyst which is about 2nm in size and good in dispersion is prepared.

The invention provides a preparation method of a catalyst for preparing glycollic acid by oxidizing ethylene glycol, which comprises the following steps: impregnating a carrier in an impregnation liquid containing active metal salt, auxiliary metal salt and a polyhydroxy compound in equal volume, drying, roasting and reducing to obtain the catalyst for preparing glycollic acid by oxidizing ethylene glycol, wherein the active metal salt is selected from Pt salt and Pd salt, or Pt salt and Ru salt; the auxiliary metal salts are selected from any two of Sn, Ce, Ga, Bi, La, Mn and Rb salts; the carrier is a mixture of a mesoporous molecular sieve and an amorphous inorganic porous material. The catalyst prepared by the method can be used for preparing glycollic acid by high-activity and high-selectivity oxidation of ethylene glycol under mild, green and alkali-free conditions under the condition of low catalyst dosage.

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 discloses a method for synthesizing phenolic compounds by catalyzing hydroxylation reaction of aromatic compounds by iron, which comprises the following step: in a solvent, catalyzing and oxidizing aromatic compounds to synthesize phenolic compounds by taking iron as a catalyst and amino acid or derivatives thereof as ligands under the action of an oxidizing agent and a reducing agent. According to the method, the phenolic compound is synthesized by carrying out hydroxylation on the C-H bond of the catalytic oxidation aromatic compound. The method has the advantages that the catalyst is wide in source and low in cost; the oxidant is wide in source, safe and environment-friendly; the compatibility of substrate functional groups is good, and the reaction selectivity is good; complex small molecules can be well converted into hydroxylated products, and the like. According to the method disclosed by the invention, under optimized reaction conditions, the yield of the separated target product can reach 95%.

A method for producing hydrocarbons includes subjecting a first feed stream to steam cracking to obtain a first product stream, and subjecting an ethane-containing second feed stream to oxidative dehydrogenation to obtain a second product stream. A portion of the first product stream is subjected to a deethanization or a depropanization separately from the second product to obtain a lighter fraction and a heavier fraction. A demethanization feed stream is formed by combining at least a portion of the lighter fraction and at least a portion of the second product stream and is subjected at least in part to demethanization. Partial oxygen removal is carried out during the formation of the demethanization feed stream. The oxygen removal is carried out downstream of the combining step.

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 provides a method for preparing glycollic acid through ethylene glycol oxidation, which comprises the following steps: carrying out oxidation reaction on ethylene glycol under the action of a catalyst to obtain glycollic acid, the pressure of the oxidation reaction is 1.0-2.0 MPa, the temperature is 60-80 DEG C, and the dosage ratio of the catalyst to the ethylene glycol is 1g: (10-20) mol; a carrier of the catalyst comprises a mesoporous molecular sieve, an active component of the catalyst comprises Pt, and auxiliary active components of the catalyst comprise Mn, Sn and Bi; based on 100% of the mass of the catalyst, the content of Pt is 0.8%-1.6%, and the total content of Sn, Bi and Mn is 1.0%-3.5%. According to the method, the selectivity of glycollic acid and the yield of ethylene glycol are remarkably improved by adopting the catalyst which takes Pt as an active component and Mn, Sn and Bi as auxiliary active components and combining parameters such as limited catalyst dosage, reaction pressure and temperature.

[Problem] The present invention addresses the problem of inexpensively obtaining a water-absorbing resin which achieves performance that is at least equivalent to that of conventional water-absorbing resins derived from fossil raw materials and in which the amount of impurities is equivalent to, or lower than, that in conventional water-absorbing resins derived from fossil raw materials despite being produced using bio-raw materials able to be recycled in the production of the water-absorbing resin. [Solution] Provided is a method for producing a water-absorbing resin derived from bio-raw materials, the method having steps (i) to (vii) below. A step (i) for obtaining acetone from bioethanol; a step (ii) for obtaining isopropanol from the acetone; a step (iii) for obtaining propylene from the isopropanol; a step (iv) for obtaining acrylic acid from the propylene; a step (v) for polymerizing an aqueous monomer solution containing the acrylic acid to obtain poly(acrylic acid) and / or a salt thereof; a step (vi) for drying the poly(acrylic acid) and / or salt thereof; and a step (vii) for surface crosslinking the poly(acrylic acid) and / or salt thereof.

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 relates to a method for synthesizing tetrasubstituted ‑1,3‑enedicarboxylic acid, and discloses a method for synthesizing tetrasubstituted ‑1,3‑enedicarboxylic acid. The method comprises the following steps: using 1,3‑enyne and iodide as raw materials, potassium formate as a formate source, DABCO as a hydrogen transfer catalyst, Ir(bpy)2(dtbpy)PF6 as a photocatalyst, and cesium carbonate as a base, introducing CO2 under normal pressure, and obtaining an enedicarboxylic acid compound with an excellent to good yield under room temperature and visible light irradiation for 24 hours. The method has mild reaction conditions, good regioselectivity, and good functional group tolerance, and makes up for many deficiencies of the prior art.

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 present invention provides compounds of Formula (I) : wherein all of the variables are as defined herein, which inhibit NOD-like receptor protein 3 (NLRP3) inflammasome activity. The invention further relates to the processes for their preparation, pharmaceutical compositions and medicaments containing them, and their use in the treatment of disease and disorders mediated by NLRP3.

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 catalyst for preparing formic acid through thermocatalysis CO2 hydrogenation and a preparation method and application of the catalyst in a reaction for preparing formic acid through thermocatalysis CO2 hydrogenation, the catalyst comprises an active component and a carrier for bearing the active component, the active component is a transition metal monatomic atom, the carrier is modified by an organic ligand in advance, and the organic ligand is a transition metal monatomic atom. One end of the organic ligand is uniformly grafted on the surface of the carrier, and the other end of the organic ligand is coordinated with a transition metal single atom. The preparation method of the catalyst is simple, expensive ligands do not need to be used, and the cost is low; the transition metal in the catalyst is in a monatomic dispersed state, and the utilization rate of the metal is high. The prepared catalyst shows good catalytic activity on a reaction for preparing formic acid through thermocatalytic CO2 hydrogenation under the condition that an organic solvent is not used; the catalyst even can thermocatalyze CO2 hydrogenation in a water phase to prepare formic acid under the condition of not adding alkali.

The invention relates to the technical field of chemical synthesis, and discloses a method for preparing short-chain diacid by catalytic oxidation of polyethylene with an ionic liquid, which comprises the following steps: mixing the ionic liquid and polyethylene, and mixing for oxidation reaction in the presence of nitric oxide and oxygen to obtain the short-chain diacid. According to the method, the polyethylene is adopted as the raw material for the first time, the ionic liquid is used as the reaction catalyst and the reaction medium, nitric oxide is catalyzed to generate nitrogen dioxide, efficient catalytic oxidation of the polyethylene is achieved, the short-chain diacid product with the carbon number of 4-12 is obtained, the highest yield reaches 90% or above, and the influence on the yield is not large when the polyethylene recycled material is adopted. The method not only solves the problem of polyethylene waste recovery, but also solves the problem of high preparation cost of short-chain diacid, so that the preparation cost is greatly reduced.