132 results about "Acrolein" patented technology

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 application discloses a high-activity and high-stability catalyst for synthesizing methacrylonitrile and a preparation method and application thereof, and has the technical scheme that (1) manganese dioxide powder is added into an acid solution and placed in an oven, and the manganese dioxide powder is pickled at 120-150 DEG C for 10-24h; the pickling solution is filtered, washed, dried and calcined to obtain a pickling-treated catalyst carrier; (2) a ruthenium precursor is added into a solvent and fully dissolved to obtain a ruthenium solution; the pickling-treated catalyst carrier is added into the ruthenium solution and loaded under ultrasonic, and then the solution is filtered, washed, dried and calcined to obtain a ruthenium monatomic catalyst. The method is simple, the reaction condition is mild, the production cost is low, raw materials are easy to obtain, the conversion rate of methacrolein is high, the yield of methacrylonitrile is high, and the stability is good.

The invention belongs to the technical field of perfume preparation processes, and particularly relates to a preparation process of fragrance lasting type perfume ligustral, which comprises the following steps: a catalytic dehydration step: mixing isohexylene glycol and a composite catalyst according to a mass ratio of 100: (0.8-1.2), and carrying out a catalytic dehydration reaction under a gradient heating condition to generate a methyl pentadiene mixture; a Diels-Alder addition step: carrying out an addition reaction on acrolein and a methyl pentadiene mixture according to a mass ratio of 1: (1.05-1.15) under a sectional temperature control condition, controlling the reaction pressure to be 0.25-0.35 MPa, carrying out a heat preservation reaction for 2 hours, and cooling to obtain a ligustral crude product; and a three-tower series rectification step: separating and purifying the ligustral crude product after the addition reaction through a light component removal tower, a middle component removal tower and a refining tower in sequence to obtain a ligustral finished product. By optimizing a catalytic system, reaction conditions and a separation process, the purity and aroma durability of the product are improved.

The invention discloses a method for preparing 1, 3-propylene glycol by hydrating and hydrogenating acrolein, which comprises the following steps: carrying out hydration reaction by taking an acrolein aqueous solution as a raw material and taking acylated and aminated modified polystyrene resin as a catalyst; carrying out flash evaporation or gas stripping on the product after the reaction to remove acrolein, condensing and recovering the removed acrolein, and carrying out hydrogenation reaction on the acrolein-removed mixed solution serving as a hydrogenation raw material on a metal catalyst; and after the reaction is finished, performing flash evaporation on the product to remove water and light components, and performing vacuum rectification to obtain a high-purity 1, 3-propylene glycol product. According to the method, the modified resin is used for catalyzing the acrolein hydration reaction, the overall yield of the 1, 3-propylene glycol can be increased, the catalyst modification process is simple, the cost is low, the additional value of the final product is high, and the method is suitable for industrial production.

The application provides an ammonia oxidation catalyst, a preparation method and application thereof, and a method for synthesizing acrylonitrile by propylene ammonia oxidation, and the general formula of the active component of the catalyst is Mo 12 Bi a B b C c D d O x ; wherein B is selected from at least one of group VIII metal elements; C is selected from at least one of alkaline earth metal elements; D is selected from at least one of alkali metal elements; and the hollow rate of the catalyst is 0-5%. The catalyst has the advantages of good sphericity, few hollow particles, uniform particle size distribution, good fluidization state in a fluidized bed reactor, less catalyst loss after long-term operation, high acrylonitrile yield, low content of by-products two-carbon and propylene aldehyde, and better long-term operation stability.

The present application provides a catalyst for preparing acrylonitrile, which comprises a carrier and an active component, wherein the active component is a metal oxide having the general formula (I) A a B b C c Fe d Ni e Bi f Mo 12 O x (I). The present application also provides a method for preparing the catalyst for preparing acrylonitrile of the present application. The present application also provides the use of the catalyst for preparing acrylonitrile of the present application or the catalyst for preparing acrylonitrile prepared according to the method of the present application in the preparation of acrylonitrile by propylene ammoxidation. The catalyst for preparing acrylonitrile of the present application still has a high acrylonitrile yield under a high propylene load. The catalyst not only has a high acrylonitrile yield under a high propylene load, but also has a low acrolein yield, so that the acrylonitrile recovery rate of the device is high to improve the production efficiency and economic benefit of the device.

The invention relates to the technical field of pesticide production, and particularly discloses a preparation process of glufosinate-ammonium intermediate 3-(methyl hydroxyl phosphonyl) propionaldehyde. The preparation method comprises the following steps: 1, carrying out addition reaction on diethyl methylphosphonite and acrylic acid in absolute ethyl alcohol to generate 3-[ethyoxyl (methyl) phosphonyl] propionate; in the second step, 3-[ethyoxyl (methyl) phosphonyl] propionate is subjected to a hydrosilylation reaction in an oriented mode, and 3-triethyl siloxy-3-ethyoxyl propyl methyl ethyl phosphonate is generated; and 3, carrying out a simple dilute acid hydrolysis reaction to obtain the 3-(methyl hydroxyl phosphonyl) propionaldehyde. According to the method, a three-step reaction route of addition-hydrosilylation-hydrolysis is adopted, and the acrylic acid is used for replacing the traditional high-toxicity raw material acrolein, so that the toxicity risk is avoided from the source, the yield of the target glufosinate-ammonium intermediate is remarkably improved, the total yield of the three-step reaction can reach 95% or above, and the method is suitable for industrial production. And an efficient and green brand-new technical scheme is provided for large-scale production of glufosinate-ammonium.

The invention belongs to the technical field of catalysts, and discloses a nanorod-like Keggin type heteropolyacid catalyst and a preparation method and application thereof, the nanorod-like Keggin type heteropolyacid catalyst has a double rod-like structure, and the double rod-like structure is a rod-like structure with the length of 50-150 nm and a rod-like structure with the length of 3-10 [mu] m. The heteropolyacid catalyst has the characteristics of large specific surface area, double rodlike structure and the like, and the reaction performance of the catalyst for preparing methacrylic acid by oxidizing methylacrolein can be optimized.

The application discloses a quantum weak measurement real-time detection method and system for studying the drug efficiency of acrolein. The application uses the quantum weak measurement method to realize real-time, label-free and quantitative monitoring of the interaction process between acrolein and organoids, obtains drug efficiency evaluation parameters such as a steady-state response amplitude, an initial response rate, a steady-state time and / or an estimated absorption / binding amount, and can realize in-vitro drug sensitivity stratification and tolerance-related phenotype evaluation in combination with an organoid activity readout. When the sample shows reduced absorption / binding amount and / or reduced kinetic rate, it can be indicated that there is an 'absorption deficiency type tolerance-related phenotype', which is used for further mechanism research and drug strategy optimization. The technology has the advantages of good real-time performance, few sample processing steps, clear application scene and the like.

A method for controlling a chemical process, by preparing methanol, hydrogen sulfide, methyl mercaptan, hydrocyanic acid, acrolein, 3-methylthiopropionaldehyde, 5-(2-methylmercaptoethyl)-hydantoin, methionine, a salt of methionine, and a derivative of methionine. The method includes providing a training set TS1, wherein TS1 is process values PV1 and process values PV2 being correlated to one another, and / or laboratory values LV1 and process values PV2 being correlated to one another. The method includes training a processing unit on the training set TS1 to identify a pattern of correlation between one or more measured process variables and at least one process variable. The method includes developing a calibration function CF1 for a calibrated soft sensor from the identified pattern of correlation and predicting at least one operating parameter for the chemical process as an approximation to LV1 and / or PV1. A system for controlling a chemical process.

The invention discloses a preparation method of 1, 5-hexadiene-3, 4-diol, which is characterized in that acrolein is used as a raw material, and the 1, 5-hexadiene-3, 4-diol is prepared by reductive coupling reaction in the presence of an ammonium chloride aqueous solution and a zinc powder catalyst. According to the method, the yield reaches up to 92% or above, compared with an existing synthesis method, reaction operation is simplified, the reaction yield is increased, and a novel reduction method is provided; the separation and purification method is simple and efficient, the product quality is high, the commercialized use requirement can be met, and large-scale production is achieved.

The application discloses a preparation method of 3,4-dihydropyran derivatives, and a reaction formula is as follows: the unactivated propenal and the weak polar olefin which are simple in structure and low in material cost are used as starting materials, the unactivated propenal and the weak polar olefin which are weak in reactivity can participate in [4+2] cycloaddition, and the 3,4-dihydropyran derivatives with high purity can be prepared; the preparation process is simple in operation, high in yield and excellent in diastereoselectivity, can effectively convert low-cost raw materials into high-value-added compounds, and provides an economic and efficient synthesis strategy for related industries.

The invention relates to the field of catalytic materials, in particular to an immobilized catalyst for preparing methylacrolein through a Mannich condensation method and a preparation method of the immobilized catalyst, and solves the problems that an existing catalyst is not easy to separate and poor in stability, and the catalytic performance needs to be improved. According to the method, organic amine is immobilized on the surface of silica gel through Si-O-Si bonds, and then the silica gel is acidified through organic acid. The catalyst is prepared by the method. The catalyst disclosed by the invention is good in catalytic performance, good in conversion rate and selectivity, easy to separate, recycle and reuse after being used, and stable in physical property after being recycled for multiple times; the method disclosed by the invention is extremely simple, low in cost and energy consumption and mild in reaction condition.

A method for forming a dehydration catalyst may comprise peptizing a catalyst precursor with an acid, a cellulose ether, or both, thereby forming a catalyst precursor sol, wherein the catalyst precursor comprising a tungstated support of tungsten and at least one of zirconium oxides, zirconium hydroxides, or titanium oxides; subjecting the catalyst precursor sol to kneading and extrusion to form one or more catalyst precursor extrudates; calcining the one or more catalyst precursor extrudates to form a calcined catalyst precursor; and cooling the calcined catalyst precursor to form the dehydration catalyst.

The invention belongs to the technical field of catalysts, and particularly provides a supported acrylonitrile catalyst and a preparation method thereof, the acrylonitrile catalyst comprises the following raw materials by weight: 50-60 parts of an active component, 6-10 parts of a rare earth precursor, 50-65 parts of a MnO2 / SiO2 composite carrier, 18-28 parts of a cosolvent, and 160-200 parts of deionized water. The acrylonitrile catalyst provided by the invention can be used in a production process of a propylene ammoxidation method, and has the advantages of high acrylonitrile yield, low acraldehyde yield and good mechanical strength.

Provided is a method for producing (meth) acrolein or (meth) acrylic acid with which it is possible to perform an oxidation reaction in a stable state while reducing the concern of catalyst deterioration or uncontrolled oxidation reaction at the time of restart after shutdown. A method for producing (meth) acrolein or (meth) acrylic acid using a fixed bed reactor provided with a heat medium and a catalyst layer, the method comprising (i) operating and supplying a raw material gas to the fixed bed reactor with the temperature of the heat medium being Ta [DEG C] and the supply rate of the raw material gas being maximum A [Nm3 / hr], (ii) shutting down, and (ii) supplying the raw material gas to the fixed bed reactor with the temperature of the heat medium being Ta [DEG C] and the supply rate of the raw material gas being maximum A [Nm3 / hr]. (iii) stopping the supply of the raw material gas to the fixed bed reactor, and (ii-1) restarting the operation, restarting the supply of the raw material gas to the fixed bed reactor, and increasing the supply speed of the raw material gas to a stable operation state; the maximum temperature of the temperature Tb [DEG C] of the heat medium in the restart operation (ii-1) is higher than Ta [DEG C].

Provided is a simple method for producing a heterocycle-containing amino acid compound. A heterocycle-containing amino acid compound is produced by a method comprising step A of reacting a compound represented by the following formula (2) or a salt thereof:wherein R4 is a hydrogen atom or a carboxyl-protecting group, and n is an integer of 1 to 3,acrolein, a cyanating agent, and a compound represented by the following formula (3) or a salt thereof:wherein R1a is a hydrogen atom or CO2R1b, R1b is a hydrogen atom or a carboxyl-protecting group, R2a is a hydrogen atom or OR2b, R2b is a hydrogen atom or a hydroxyl-protecting group, and R3 is a hydrogen atom or an amino-protecting group.

A reactor for producing acrolein and / or acrylic acid from propylene comprises an inlet for propylene to enter the reactor, an outlet for reaction products to exit the reactor, and a catalyst bed disposed between the inlet and the outlet. The catalyst bed comprises a molybdenum and bismuth based mixed oxide catalyst. The catalyst closest to the inlet of the reactor, CATinlet, produces a lower amount of maleic anhydride to the total amount of acrolein and acrylic acid compared to the catalyst closest to the outlet of the reactor, CAToutlet.

This invention discloses a supported acrolein selective oxidation catalyst and its preparation method, relating to the field of acrolein oxidation technology. The catalyst comprises: an inert porous inorganic support and a mixed metal oxide active component supported on the surface of the inert porous inorganic support; the mixed metal oxide active component includes oxides of molybdenum, vanadium, and tungsten. This invention achieves strong anchoring of the active component on the support surface through chemical bonding, effectively resisting airflow erosion and extending its service life. Simultaneously, it utilizes the spatial confinement effect to inhibit metal particle agglomeration, forming abundant nanopores in situ, improving the dispersion of active sites and reaction mass transfer efficiency, making it suitable for various operating conditions.

A method of ameliorating microbial growth associated with equipment comprising the step of: contacting the microbial growth with an effective amount of a microbially active copolymer, wherein the microbially active copolymer comprises an acrolein derived segment and a polyalkylene glycol oligomer, and wherein the microbially active copolymer is obtainable by a process comprising reacting the polyalkylene glycol with acrolein in an aqueous solution to form the microbially active copolymer.

The invention discloses a reaction tower with combined pickling and purifying functions for acrolein production, and belongs to the technical field of acrolein treatment. Comprising a combined absorption tower, the combined absorption tower is provided with a purification tower, the purification tower is fixedly connected with a liquid inlet pipe used for conveying an acrolein solution into the purification tower, the combined absorption tower is communicated with the liquid inlet pipe, two sliding discs are connected into the purification tower in a sealed and sliding mode, and the space between the two sliding discs is used for being filled with filler. Supporting pipes which are distributed at equal intervals in the circumferential direction are fixedly connected between the two sliding discs, through grooves are formed in the supporting pipes, and the supporting pipes which are distributed at equal intervals in the circumferential direction are jointly and fixedly connected and communicate with a flow guide shell which slides in a sealing mode with the purifying tower. The acrolein is subjected to acid pickling and purification through the combination of the absorption tower and the purification tower, the continuity of the processing process is guaranteed, water vapor is conveyed to the middle of the filler through the supporting pipe and the through groove, the amount of the water vapor making contact with an acrolein solution is increased, and the acrolein purification efficiency is improved.

The invention discloses steam deodorizing and drying equipment for plastics and composite materials and a working method of the steam deodorizing and drying equipment. The steam deodorizing and drying equipment comprises a feeding box; the switching valve is connected with the feeding box; the steam deodorization assembly comprises a steam tank, a stirrer and an air blower, a steam ring pipe is arranged in the steam tank, a plurality of steam holes capable of spraying steam are formed in the steam ring pipe, the stirrer is installed in the steam tank and penetrates through the steam ring pipe, and the air blower is connected with the steam tank so as to conduct hot air drying or cold air heat dissipation on materials in the steam tank; and the discharging box is connected with the steam tank and is used for discharging the materials in the steam tank. According to the equipment, water-soluble substances such as formaldehyde, acetaldehyde, acrolein and the like in VOC substances are removed by using steam, and high-boiling-point VOC substances such as benzene, methylbenzene, ethylbenzene, xylene, styrene and the like are removed while the materials are dried by using the air blower subsequently, so that full-process automatic material odor removal is completed. The invention relates to the technical field of plastic and composite material processing equipment.

The invention provides a methacrylic acid catalyst, the chemical general formula of which is PxMoyVzOw [-COOH] n, P, Mo and V are active components, and the molar ratio of x: y: z: w: n is (0.8-2.0): (10.0-12.0): (0.5-2.5): (30.0-50.0): (1.0-6.0). When the methacrylic acid catalyst is used for selectively oxidizing methylacrolein, the methylacrolein conversion rate and the methacrylic acid selectivity are high, and the stability is excellent. And the preparation method of the methacrylic acid catalyst is simple, convenient and low in cost.

A method for forming a dehydration catalyst may comprise peptizing a catalyst precursor with an acid, a cellulose ether, or both, thereby forming a catalyst precursor sol, wherein the catalyst precursor comprising a tungstated support of tungsten and at least one of zirconium oxides, zirconium hydroxides, or titanium oxides; subjecting the catalyst precursor sol to kneading and extrusion to form one or more catalyst precursor extrudates; calcining the one or more catalyst precursor extrudates to form a calcined catalyst precursor; and cooling the calcined catalyst precursor to form the dehydration catalyst. The catalysts of the examples have platinum or palladium impregnated on a tungstated zirconia support.

The present application relates to the field of propylene aldehyde preparation, in particular to a method for industrialized preparation of propylene aldehyde, which is carried out in a pry-mounted propylene aldehyde production device, comprising the following steps: S1: mixing glycerol and an ionic liquid catalyst in the mixer (3) to obtain mixed raw materials, S2: introducing the mixed raw materials into a reaction medium in a reaction container (10) through a metering pump (4) to carry out a dehydration reaction, generating a propylene aldehyde product, which is collected and stored by the propylene aldehyde collector (12). The method provided by the present application is carried out in a pry-mounted propylene aldehyde production device, parameters in the preparation process are easy to control, and the propylene aldehyde production efficiency is high, which can produce propylene aldehyde on the oilfield site that needs to treat sewage, that is, it can be used immediately after production, solving the technical problem that propylene aldehyde is difficult to apply to oilfield sewage treatment due to its extremely unstable nature, difficult storage and transportation, and realizing the industrialized application of propylene aldehyde in the field of oilfield sewage treatment.

Provided is a method for producing a catalyst having excellent catalytic activity and yield, which is used in a method for producing propenal and acrylic acid by catalytic gas-phase oxidation of propylene. The method for producing the catalyst is a method for producing a catalyst for producing propenal and acrylic acid by catalytic gas-phase oxidation of propylene, which includes a step of mixing a raw material mixture of a raw material compound containing molybdenum, a raw material compound of bismuth, and a raw material compound of cobalt, the raw material compound of cobalt being cobalt nitrate hexahydrate, the mass loss rate L1 of the cobalt nitrate hexahydrate in thermogravimetric analysis from 25°C to 105°C being 11 to 16 mass%.

The invention relates to the field of catalysts, in particular to an oxidation catalyst, a preparation method and application thereof and a method for preparing acrolein through propylene oxidation. The active components of the catalyst contain Mo element, Bi element, Fe element, Ni element and M, wherein M is selected from at least one element of Co, Mn, Ce, Zr, K and Ca; an active component of the catalyst has a hierarchical pore structure and comprises nano pore channels and micron pore channels; in the hierarchical pore structure of the active component, the pore volume ratio of the micron pore channels is not lower than the pore volume ratio of the nano pore channels. The catalyst provided by the invention has excellent reactivity and target product selectivity during use.

The invention relates to an aromatic polymer material, a preparation method thereof and application of the aromatic polymer material as a fluorescence sensor in active carbonyl compound detection, and belongs to the field of fluorescence sensing. The preparation method comprises the following steps: by taking squaric acid (SA) and 1, 3, 5-tri (4-aminophenyl) benzene (TAPB) as monomers, carrying out solvothermal condensation reaction in a water-phase solvent to prepare the aromatic polymer material SA-TAPB. The polymer material presents a regular microsphere morphology and has good fluorescence performance, the invention also discloses application of the material in the field of fluorescence sensing, especially detection of active carbonyl compounds, and the material has high specific recognition capability on active carbonyl compounds such as formaldehyde (FA), glyoxal (Gly), acrolein (MGO) and the like in various analytes, and has good application prospects. High-selectivity and high-sensitivity fluorescent sensing of the compounds can be realized, and the preparation method is simple, convenient and efficient and has extremely high practicability.