2458results about "Carboxylic compound preparation" patented technology

The utility model discloses a cracking kettle for preparing sebacic acid by cracking castor oil. The device is characterized in that a cracking kettle body is divided into an upper-layer kettle and a lower-layer kettle, and the upper-layer kettle and the lower-layer kettle are separated by a separation plate; a plurality of gas dispersion channels are distributed on the isolation plate; the gas dispersion channel is made of a non-sticky high-temperature-resistant material, the gas dispersion channel is a bevel channel, and the inlet end and the outlet end are symmetrically arranged up and down; a feeding channel is arranged above the cracking kettle body, an internal channel is arranged at the top in the cracking kettle body, a through hole is formed in the isolation plate, and the internal channel penetrates through the through hole of the isolation plate and is communicated with the lower-layer kettle; the feeding channel penetrates into the cracking kettle body and is communicated with the internal channel; the inner channel is a double-layer pipeline, the inner space is a stirring rod channel, and the outer space is a feed liquid channel; the stirring rod penetrates through the stirring rod channel and extends into the lower-layer kettle; the stirring paddle is spirally arranged at the lower end of the stirring rod. The gas outlet can be protected, the gas outlet is prevented from being blocked by non-gas products, and smooth output of the gas products is guaranteed.

The invention discloses a ferulic acid-derived binary acyl chloride compound, a copolymerization modified para-aramid resin, and a preparation method and application of the ferulic acid-derived binary acyl chloride compound and the copolymerization modified para-aramid resin. The structural formula of the copolymerization modified para-aramid resin is as follows: # imgabs0 #, wherein m: n = (90-99): (10-1). According to the invention, an asymmetric third monomer ferulic acid derived binary acyl chloride is introduced into a traditional para-aramid fiber structure for modification, so that the dissolvability of the material is enhanced, and the flexibility of the material is improved while the relatively high mechanical strength of the original para-aramid fiber is maintained.

The invention provides a preparation method of a triazine / heptazine homojunction structure carbon-doped carbon nitride photocatalyst, which comprises the following specific steps: (1) placing mixed powder of melamine and 2, 4, 6-triaminopyrimidine in air, heating to 300-500 DEG C, and calcining for 2-6 hours to form a mixture of carbon-doped melamine and oligomer thereof; (2) placing the mixture obtained in the step (1) in water at 60-70 DEG C, performing ultrasonic dispersion, then slowly cooling to room temperature, oscillating for 12-36 hours, removing moisture through rotary evaporation, and further drying to obtain a solid supramolecular precursor; and (3) fully mixing the solid supramolecular precursor obtained in the step (2) with molten salt, calcining at 500-600 DEG C for 2-6 hours, cooling, fully washing with deionized water, removing mixed salt, separating solid residues, and drying to obtain the triazine / heptazine homojunction structure carbon-doped carbon nitride photocatalyst THCNx-t. The prepared carbon-doped carbon nitride photocatalyst is uniform in homojunction distribution, and has the characteristics of excellent photochemical properties, high photon-generated carrier separation efficiency and excellent photocatalytic benzyl alcohol selective oxidation performance.

The invention relates to a method for synthesizing tetrasubstituted-1, 3-allene dicarboxylic acid, and discloses a method for synthesizing tetrasubstituted-1, 3-allene dicarboxylic acid by taking 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 alkali through the following steps: introducing CO2 at normal pressure; the allene dicarboxylic acid compound can be obtained at excellent to good yield under the irradiation of visible light at room temperature for 24 hours, the reaction condition is mild, the regioselectivity is good, the functional group tolerance is good, and many defects in the prior art are overcome.

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 provides a preparation method and application of magnesium L-threonate, and belongs to the technical field of medicines. The preparation method comprises the following steps: dissolving L-ascorbic acid in water, adding magnesium hydroxide and alkaline magnesium carbonate, stirring, dropwise adding hydrogen peroxide, heating, stirring and reacting, filtering a product, purifying and concentrating by temperature-sensitive molecularly imprinted hydrogel while the product is hot, adding an ethanol water solution into a concentrated solution, standing, crystallizing, filtering, washing and drying to obtain the magnesium L-threonate. And cooling the temperature-sensitive molecularly imprinted hydrogel after adsorption to room temperature, washing and repeatedly using the temperature-sensitive molecularly imprinted hydrogel. The magnesium L-threonate is simple in preparation method, high in purity and high in yield, meanwhile, the slow-release magnesium L-threonate is prepared, and the magnesium L-threonate is low in toxicity, good in biocompatibility, large in drug loading capacity, low in economic cost and good in drug effect and has wide application prospects in preparation of anti-depression drugs.

The invention relates to the technical field of catalysts, in particular to a preparation method of a reaction catalyst for preparing acrylic acid through selective oxidation of propane, which comprises the following steps: adding a precursor salt solution into an aqueous solution, uniformly stirring, adding a certain mass of an active agent into the solution, uniformly stirring, and drying to obtain the catalyst. The preparation method comprises the following steps: preparing a solution, carrying out hydrothermal treatment on the solution at a certain temperature, washing and drying, roasting the obtained solid in a muffle furnace, and finally roasting the roasted solid in a tubular furnace under the protection of argon to obtain the final catalyst. According to the present invention, the preparation method has the simple process, and comprises the two steps of acrylic acid reaction catalyst preparation and acrylic acid preparation through the catalytic reaction of the catalyst, such that the propane conversion rate and the acrylic acid selectivity are significantly improved compared with the acrylic acid reaction catalyst prepared by the traditional method, meanwhile, the whole method is convenient to operate and easy to repeat, and has a good application prospect.

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 carbon-based confinement type catalyst as well as a preparation method and application thereof. The catalyst comprises a sludge carbon substrate, and carbon nanotubes and active metals covering the surface of the substrate, the active metal comprises Fe and Ni; ni is doped in the carbon nanotube to form a confinement structure; fe is loaded outside the carbon nanotubes. The active metal of the carbon-based confinement type catalyst is confined in a superstructure carbon nanostructure covering the surface of a carbon substrate, so that the hydrothermal oxidation efficiency can be effectively improved, the degree of cracking of sludge extracellular polymeric substances is improved, deep cracking of sludge is realized, and the risk of secondary pollution caused by loss of the active metal is reduced; the catalyst can selectively oxidize macromolecular organic matters released by sludge disintegration, the product selectivity of micromolecular carboxylic acid is improved to be higher than 95% by a confinement structure, the micromolecular carboxylic acid can be further utilized as a carbon source, the treated supernate can be used as a composite carbon source to be applied to the biochemical process of sewage treatment, and resource utilization is realized; the catalyst can realize HTO treatment of sludge at 200 DEG C or below, and does not generate biotoxic by-products in the sludge treatment process, and the treated product can be used as a high-quality carbon source.

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 technical field of catalytic degradation, and particularly relates to a bismuth cluster / CTF composite photocatalyst and a preparation method and application thereof. The bismuth cluster and CTF are compounded through a hydrothermal method, photocatalytic cracking of lignin can be achieved, efficient separation of photo-induced electrons and holes of the photocatalyst can be achieved, fine adjustment of the electron structure of the photocatalyst is achieved by adjusting the addition amount of the bismuth cluster precursor, generation of h < + > and. O < 2-> in the photocatalytic process is improved, and the photocatalytic performance of the photocatalyst is improved. Therefore, the yield of the aromatic monomer prepared by cracking the lignin is improved, the cracking conversion rate can reach 78.5%, the yield of benzoic acid can reach 65.2%, the yield of benzaldehyde can reach 81.4%, the yield of phenyl formate can reach 52.6%, and the method is green, clean and safe.

The invention relates to a method for preparing high-purity 2, 6-naphthalic acid by oxidizing 2, 6-diisopropyl naphthalene. The method comprises the following steps: adding 2, 6-diisopropylnaphthalene, a catalyst, a solvent and an additive into a titanium reaction kettle, uniformly mixing, introducing nitrogen to remove oxygen, raising the temperature in the titanium reaction kettle to 150-220 DEG C, and introducing nitrogen to ensure that the pressure in the titanium reaction kettle is 0.5-1 MPa; the solvent is a mixture containing acetic acid and water; pure oxygen is introduced into the titanium reaction kettle, so that the pressure in the titanium reaction kettle is increased to 2.4-3.2 MPa, the reaction system reacts for 1-3 h under the condition that the pure oxygen is continuously introduced, and 2, 6-naphthalic acid is prepared; the 2, 6-naphthalic acid prepared by the method has the advantage of high purity.

A method for producing one or more hydrocarbons, includes subjecting a first feed stream to a steam cracking to obtain a first product stream and subjecting a second feed stream containing ethane to an oxidative dehydrogenation to obtain a second product stream At least a portion of the first product stream is subjected to a treatment to obtain hydrocarbon fractions. The treatment includes a selective hydrogenation of hydrocarbons having two carbon atoms and a demethanization. At least a portion of the second product stream is subjected to a trace removal, which comprises the removal of oxygen and / or acetylene, to obtain an subsequent stream. At least a portion of the subsequent stream is fed to the treatment at a position downstream of the selective hydrogenation and upstream of the demethanization. A portion of the subsequent stream is subjected to a carbon dioxide removal upstream of the feed point into the treatment.

The invention provides a synthetic method of 2-methyl-4-chloropropionic acid-polyethylene glycol ester, and belongs to the technical field of preparation of 2-methyl-4-chloropropionic acid-polyethylene glycol ester. The method comprises the following steps: adding o-cresol, dichloroethane and a catalyst, and reacting sulfuryl chloride at the temperature of below 15 DEG C; performing separation to obtain p-chloro-o-cresol and 6-chloro-o-cresol; adding p-chloro-o-cresol, 2-chloropropionic acid and caustic soda liquid to synthesize 2-methyl-4-chloropropionic acid; 2-methyl-4-chloropropionic acid is acidized, cooled, crystallized and sliced, 2-methyl-4-chloropropionic acid, polyethylene glycol and a neutral catalyst are added for a reaction, and the di-2-(4-chloro-2-methyl-phenoxy) propionic acid-polyethylene glycol ester is synthesized. The method is simple in process, mild in reaction and high in yield. By means of the synthesis method, a qualified product with the p-chloro-o-cresol content larger than 99% can be produced, other phenol impurities are not contained, the synthesis quality of p-chloro-o-cresol is guaranteed, meanwhile, synthesis of 2-methyl-4-chloropropionic acid-polyethylene glycol ester is easier to control, the product quality can be greatly improved, and meanwhile the domestic blank is filled up.

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.

This method for producing a deuterium-labeled compound is characterized by comprising: supplying a proton supply source and heavy water to the anode side of a membrane electrode assembly including an electrode and a proton conductive membrane; supplying a compound to be deuterated to the cathode side of the membrane electrode assembly; and energizing the membrane electrode assembly to deuterate the compound on the cathode side.

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.

The invention relates to the technical field of organic synthesis processes, and provides a method for preparing methyl o-chlorobenzoate from o-chlorotoluene, which comprises the following steps: adding o-chlorotoluene, acetic acid and a supported catalyst into a mixing kettle, heating to 60-120 DEG C, and stirring to obtain a mixed solution; pouring the mixed solution into a reaction kettle, introducing air to pressurize, heating to 130-180 DEG C, reacting for 2-4 hours, discharging, cooling, filtering, washing and distilling to obtain o-chlorobenzoic acid; the method comprises the following steps: mixing o-chlorobenzoic acid and methanol, stirring, adding a catalyst, heating to 70-90 DEG C, reacting for 2-4 hours, cooling, extracting, washing, standing and layering to obtain an upper phase, namely methyl o-chlorobenzoate. The preparation method has the advantages of low production cost, less waste gas and waste water, and realization of the coordinated development of economic benefits and environmental benefits, and the methyl o-chlorobenzoate prepared from o-chlorotoluene has the advantages of high yield, high purity, and good application 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.

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.