189 results about "Acrolein" patented technology

The invention provides a novel acrylonitrile catalyst and a preparation method thereof. The novel acrylonitrile catalyst is prepared from the following raw materials: mixed salt, an active component, silica sol, a rare earth precursor, a carrier and a cosolvent, by introducing the cosolvent and optimizing the carrier structure, the dispersity of the rare earth precursor is improved, the production process is optimized, the doping efficiency of the rare earth precursor is remarkably improved, the activity, selectivity and stability of the novel acrylonitrile catalyst are improved, generation of by-products CO, CO2, acrolein and acrylic acid during acrylonitrile production can be reduced, and industrial efficient preparation is achieved.

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.

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 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 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.

A method for applying a scavenger material to a wellbore includes providing a precursor scavenger material to a location within a wellbore extending through an earth formation, the precursor scavenger material comprising an acetal or a hydroxyaldehyde, reacting the precursor scavenger material in the wellbore or the earth formation in-situ to form a scavenger material comprising propenal, and reacting the scavenger material with at least one of hydrogen sulfide or a mercaptan to reduce a concentration of the at least one of hydrogen sulfide or the mercaptan. Related methods and systems for applying the scavenger material to the wellbore are also disclosed.

The invention relates to the technical field of catalysts, and particularly discloses a composite catalyst for preparing acrolein through catalytic oxidation of propylene and a preparation method of the composite catalyst, the composite catalyst comprises an active component I and an active component II, and the use mass ratio of the active component I to the active component II is 1: (1-19); the active component I is bismuth tungstate microspheres obtained by a hydrothermal synthesis method, and the general formula of the active component I is BiaW1Ox; the active component II is a multi-metal oxide obtained by a coprecipitation method, and the general formula of the active component II is Mo < 12 > Bi Co < c > Ni < d > Fe < e > A < f > B < g > O < y >; the bismuth tungstate microspheres obtained by a hydrothermal synthesis method and the multi-metal oxide obtained by a coprecipitation method are mixed to obtain the composite catalyst, so that the bismuth tungstate microspheres with microsphere structures can be used as active phases of reaction, and the specific surface area and the pore volume of the composite catalyst can be increased; the catalyst is suitable for a reaction for preparing acrolein through propylene catalytic oxidation under high load.

The utility model is applicable to the technical field of fixed bed reactors, and provides a fixed bed reactor convenient to replace a catalyst, which comprises a lower shell, fixed seats are fixedly connected to the lower parts of the two side surfaces of the lower shell, and electric telescopic rods are vertically and fixedly connected to the tops of the fixed seats. The top end of the electric telescopic rod is fixedly connected with a connecting ring, the surface of the connecting ring is fixedly connected with an upper shell matched with the lower shell, and the inner wall of the upper shell is fixedly connected with a partition plate. According to the fixed bed reactor convenient for replacing the catalyst, after a worker twists a piston and disassembles the piston from the bottom end of a containing cylinder, a particle inert catalyst can be discharged through an opening in the bottom end of the containing cylinder, after the particle inert catalyst is discharged, the piston is reinstalled, and the particle inert catalyst can be reloaded into the interior of the containing cylinder through an external thread connector; the replacement operation is simple and rapid, the replacement efficiency of the particle inert catalyst is improved, and the preparation and use of acrolein are facilitated.

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 utility model discloses a device for treating wastewater generated in amino acid production, which is used for treating acrolein synthesis wastewater and sequentially comprises a waste liquid storage tank, a regulating tank, a flocculation tank, a sedimentation tank, an anoxic tank, an aerobic tank, a physical adsorption filter tank, a clean water tank, a concentration device and a recovery tank along the treatment direction, the concentration device is arranged in front of the waste liquid storage pool and is respectively connected with the waste liquid storage pool and the recovery tank, and the adjusting pool is an alkaline liquid medicine adjusting pool. According to the utility model, the economic benefit and the flocculation effect are improved.

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 application discloses application of mangiferin as a broad-spectrum inhibitor of active carbonyl compounds, and provides application of mangiferin (MGF) as an acrolein (ACR), methyl glyoxal (MGO) and glyoxal (GO) inhibitor, wherein, compared with the prior art, the application discloses a new application of mangiferin or a one-addition product of the mangiferin and the active carbonyl compound, that is, the mangiferin or the one-addition product can effectively capture ACR, MGO and GO to control the content of the ACR, MGO and GO and avoid the ACR, MGO and GO from reacting with nucleophilic biological macromolecules to form various harmful addition or cross-linking products. The mangiferin or the one-addition product of the mangiferin and the active carbonyl compound can be used as a scavenger of ACR, MGO and GO, so that the ACR, MGO and GO generated in the body and in a food processing process are inhibited, and thus the various harmful addition or cross-linking products formed by the reaction of RCS with the nucleophilic biological macromolecules are blocked to cause harm to the human body.

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.

This invention relates to a selective gold-based oxidation catalyst, its preparation method, and its application; the catalyst comprises components represented by general formula (1): Au-Sc a / Si b Ce c X d O e In formula (1), a is the molar ratio of Sc to Au, with a value of 0.1 to 1.0; b is the molar ratio of Si to Au, with a value of 100 to 500; c is the molar ratio of Ce to Au, with a value of 1.0 to 30.0; d is the molar ratio of X to Au, with a value of 0.1 to 2.0; e is the number of oxygen atoms required to satisfy the oxidation states of each element in the active component; X is selected from at least one of Li, Na, K, Rb, and Cs. The catalyst of the present invention is used for selective oxidation, with high yield of target product and high conversion rate of raw materials. For example, it has the characteristics of high conversion rate of methacrolein and high yield of methyl methacrylate in the synthesis of alkyl acrylates.

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 application provides a preparation method and product of 1,3-propanediol. The preparation method comprises the following steps: subjecting 3-hydroxypropionaldehyde aqueous solution to a first-stage hydrogenation reaction under the action of a first-stage hydrogenation catalyst to obtain a first-stage hydrogenation reaction product; and subjecting the first-stage hydrogenation reaction product to a second-stage reaction under the action of a second-stage hydrogenation catalyst to obtain a 1,3-propanediol product. The preparation method adopts two-stage hydrogenation, effectively improves the economy of the propenal hydration hydrogenation process, and solves the problems that the impurities generated in the 1,3-propanediol preparation route of the propenal hydration process are difficult to treat and resource utilization.

System and processes are provided for converting glycerol to acrolein, an aldehyde to isoprene, and one or more fusel oils to isoprene. Each of this processes utilize at least one catalyst that includes a zeolite and one or more metals dopants (e.g., Group 1A metal(s), Group 2A metals(s), or any combination thereof). The at least one catalyst can optionally include one or more non-metal dopants (e.g., boron, phosphor, or a combination thereof).

This invention relates to the field of catalyst technology, specifically to an oxidation catalyst, its preparation method and application, and a method for selective oxidation of propylene. The catalyst has the general formula: Bi. a / (MoFe b X c Y d Z e )O j In this catalyst, X is selected from at least one of Mg, Co, Ni, Ca, Cu, Zn, and Mn; Y is selected from at least one of La and Ce; and Z is selected from at least one of K, Rb, Na, and Cs. The surface dispersion of Bi element is 1-3. This catalyst is used in oxidation reactions, such as the selective oxidation of propylene to acrolein and / or acrylic acid, and has the advantages of high total yield of acrolein and acrylic acid, as well as good catalyst structural stability.

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.

The present application provides a method for preparing (meth) acrylonitrile, the method comprising: a catalytic reaction step of reacting (meth) acrolein with ammonia in a reactor containing a catalyst to produce a crude product comprising (meth) acrylonitrile, unreacted ammonia, unreacted (meth) acrolein, and one or more by-products; and a purification step: separating (methyl) acrylonitrile from the crude product. According to the method, synthesis of (methyl) acrylonitrile can be realized by using a low-cost catalyst through safe, environment-friendly and mild process steps, and effective recycling of materials and heat is realized while generation of toxic impurities is avoided.

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.