25results about How to "Short reaction cycle" patented technology

This invention discloses a solid-phase thickening reactor for PETG chips, belonging to the field of polyester chip processing technology. It includes an outer cylinder with an inlet pipe and an outlet pipe installed at its top and bottom, respectively. Support legs are installed on the side of the outer cylinder. Inside the outer cylinder are a supporting cylinder and four movable inner cylinders. Connecting rings connect the supporting cylinder to the movable inner cylinders and between adjacent movable inner cylinders. This invention ensures that each chip can undergo sufficient and uniform heat exchange with the heat medium, eliminating heating "dead zones" and temperature differences in traditional equipment. Based on the synergistic effect of uniform dispersion, controllable feeding, and a three-dimensional thermal field, the raw material can undergo a thickening reaction in the reactor in an optimal state. This ensures the uniformity and thoroughness of the reaction, effectively avoiding quality problems such as chip viscosity differences and yellowing caused by uneven heating or inconsistent reaction times. Therefore, it significantly improves the final product quality, production efficiency, and batch stability of the PETG chips.

The application provides a high and low temperature resistant modified PBS material, a preparation method and an application. The modified PBS comprises the following raw materials in parts by weight: succinic acid: 100 parts; 1,4-butanediol: 110-130 parts; norbornene dimethylol succinic acid prepolymer: 15-30 parts; polyethylene glycol: 5-15 parts; a catalyst: 0.05-0.2 parts; an antioxidant: 0.1-0.5 parts; wherein the number average molecular weight of the norbornene dimethylol succinic acid prepolymer is 1000-2000 g / mol; and the number average molecular weight of the polyethylene glycol is 500-2000 g / mol. By introducing rigid norbornene bicyclic structure and flexible polyethylene glycol segments through chemical bonding, the high and low temperature performance of the PBS is synergistically improved, the modified PBS material can maintain stable mechanical properties in the range of-20 DEG C to 130 DEG C, meanwhile, the modified PBS material has excellent biodegradability, compatibility and processing performance, and the preparation process is simple and controllable, and is suitable for industrial large-scale production.

The invention discloses photocatalytic stereoselective E-type olefination of alkynyl amide and a preparation method of the alkynyl amide. The method is carried out in a water-phase micelle reaction system and is completed under the driving of visible light. According to the method, an alkynyl amide compound is taken as a raw material, sodium ascorbate is taken as a green reducing agent, Ru (bpy) 3 (PF6) 2 or [Ir (dtbpy) (ppy) 2] PF6 is taken as a photocatalyst in a water-phase micelle environment formed by a surfactant lauryl sodium sulfate (SDS), and under the protection of inert gas, catalytic circulation is initiated by visible light irradiation at 20-40 DEG C, so that the alkynyl amide compound is highly selectively converted into an E-type olefin product. The method is mild in condition, simple in step, high in stereoselectivity, environment-friendly and safe to operate, the problem that flammable and explosive reagents or harsh reaction conditions need to be used in a traditional method is solved, and a green and efficient preparation way is provided for preparation of the E-type acrylamide compound.

This invention relates to the field of organic compound preparation technology, specifically a method for preparing 11-triglycerides of carbonate via low-temperature acylation. This method uses glycerol and undecanoyl chloride as raw materials, employing a synergistic system of a "composite acid-binding agent + Lewis acid catalyst," and combines in-situ dehydration technology and a stepwise heating strategy in a dual-solvent environment to achieve efficient synthesis. The specific steps include: under nitrogen protection, dissolving glycerol in a dichloromethane-toluene dual solvent, adding a composite acid-binding agent of pyridine and N,N-diisopropylethylamine, anhydrous zinc chloride catalyst, and 4A molecular sieve for in-situ dehydration; dropwise adding undecanoyl chloride at a low temperature of 5-10°C, followed by sequential heating to 30°C for 2-3 hours and then reacting at 50°C for 12-16 hours; and post-processing using a combined process of filtration-multi-stage extraction-membrane separation-column chromatography. This invention provides mild reaction conditions, effectively suppresses side reactions, produces high-purity products, increases molar yield, and reduces solvent toxicity and purification costs.

The application discloses a kind of carbon black supported iron manganese composite oxide cluster catalyst's Joule heat preparation method and its application in electrocatalytic nitrate reduction preparation ammonia, belong to electrocatalytic ammonia preparation technical field.The catalyst Ketjenblack EC-600JD carbon black is used as carbon carrier, iron manganese composite oxide cluster is uniformly dispersed on the surface of carbon carrier, and the carbon carrier is worm-like mesoporous structure, with high specific surface area and high defect concentration.The application uses sodium citrate as complexing agent, acetylacetone iron and manganese acetate as metal precursor, after complexing, loading, gelation, freeze drying, the target catalyst is prepared by Joule heat instantaneous heat treatment under nitrogen atmosphere;The preparation process has high heat conversion efficiency, low energy consumption, can realize atomic dispersion of iron manganese composite oxide cluster, effectively improves the exposure degree of catalytic active site.The catalyst shows high catalytic activity, high selectivity and excellent stability in electrocatalytic nitrate reduction preparation ammonia reaction, and the ammonia preparation faraday efficiency can reach more than 85%, and the preparation process does not need noble metal and toxic reagent, and the process is green and efficient, easy to scale production, can efficiently convert nitrate wastewater into ammonia, with environmental governance and nitrogen resource recycling value.

This invention discloses a cerium-doped calcium-based photothermal catalyst supported on carbon nanotubes and its application in the preparation of biodiesel, belonging to the field of catalysis technology. The photothermal catalyst is prepared by the following method: a calcium source and a cerium source are mixed and dissolved in an aqueous ethanol solution, then multi-walled carbon nanotubes are added and stirred to load the calcium and cerium sources onto the surface of the multi-walled carbon nanotubes. The mixture is then dried to remove the solvent; calcined under nitrogen protection; and after calcination, naturally cooled to obtain the cerium-doped calcium-based photothermal catalyst supported on carbon nanotubes. This invention utilizes the strong electronic interaction between cerium and calcium to regulate the structure of active sites, inhibiting the aggregation and loss of active components, while simultaneously enhancing the catalyst's broad-spectrum light absorption and photothermal conversion capabilities, thereby achieving efficient and green biodiesel production.

The invention belongs to the technical field of bearing materials, and discloses vinyl hyperbranched polysiloxane, a polyvinyl composite material bearing and a preparation method.The preparation method of the vinyl hyperbranched polysiloxane comprises the following steps that a first siloxane monomer containing at least four vinyl groups and a second siloxane monomer containing sulfydryl are mixed, then adding a photoinitiator, uniformly mixing, and performing ultraviolet irradiation to obtain an intermediate; and slowly dropwise adding an aqueous medium into the intermediate, adding a catalyst at the same time, and then reacting at 60-90 DEG C for 4-8 hours to obtain the vinyl hyperbranched polysiloxane. According to the invention, an efficient and mild vinyl hyperbranched polysiloxane synthesis system is constructed, and the controllability and storage stability of the product structure are improved. According to the invention, high-efficiency compatibility of inorganic filler and a polyethylene matrix is realized by virtue of the synthesized vinyl hyperbranched polysiloxane, and the comprehensive performance and service reliability of the polyethylene-based composite material bearing are greatly improved.

The application discloses a preparation method of alpha-tuliketone, relates to organic synthesis technology utilization, and the preparation is that 4,8-dimethyl-3,7-nonadiene-2-ketone and triacetal are subjected to aldol condensation reaction under the action of acid-base bifunctional catalyst to generate alpha-tuliketone; the acid-base bifunctional catalyst is obtained by grafting organic base onto carboxylic acid functionalized mesoporous material.The acid-base bifunctional catalyst is simple in preparation, good in stability and reusable, is used for catalyzing the reaction of 4,8-dimethyl-3,7-nonadiene-2-ketone and triacetal, can directly generate target product alpha-tuliketone by one-pot method, is high in reaction activity, short in reaction period, simple in post-treatment, simplifies process, is high in yield, and the yield can reach more than 95%.

The application belongs to the field of enzyme engineering and biological catalysis technology, and particularly relates to a carboxylate reductase SeCAR capable of efficiently catalyzing conversion of acetic acid and ammonia water into acetamide, and a preparation method and application of the enzyme. The application discloses a carboxylate reductase SeCAR capable of catalyzing conversion of acetic acid and ammonia water into acetamide, wherein an amino acid sequence is shown as SEQ ID NO. 1, and a nucleotide sequence is shown as SEQ ID NO. 2. The application also discloses a recombinant engineering bacterium containing the carboxylate reductase SeCAR, a construction method, and a method for inducing expression of the carboxylate reductase SeCAR by the recombinant engineering bacterium. The application discloses, for the first time, the SeCAR enzyme capable of directly catalyzing conversion of acetic acid and ammonia water into acetamide, and the preparation method is simple, which fills the blank of no special enzyme for catalyzing the reaction in the prior art. The prepared SeCAR enzyme has high catalytic efficiency, short reaction period, and high acetamide yield, and meets the development trend of green chemical industry.

The invention discloses a method for preparing high-purity ferric oxide by using pickling waste liquid of a steel mill, and belongs to the technical field of inorganic pigments. The method comprises the following steps: by taking steel mill pickling waste liquid as a raw material, pretreating the raw material, and adjusting pH; and then carrying out ion exchange pretreatment, catalytic oxidation, calcination and grinding to obtain iron oxide. Through the efficient acceleration effect of a Mn < 2 + > catalytic oxidation system on conversion from Fe < 2 + > to Fe < 3 + >, the reaction period is remarkably shortened, the process energy consumption is reduced, the process efficiency is greatly improved by combining efficient removal of Ca < 2 + > through ion exchange pretreatment, the steel mill pickling waste liquid is used as the raw material, the production cost is low, large-scale preparation and industrial application are easy, and the method is suitable for industrial production. Meanwhile, the prepared ferric oxide is high in purity, strong in color consistency and good in stability, and the hue L value deviation is 1t; 2.

The invention discloses a process and a method for preparing a nano material. Specifically, lithium iron phosphate, composite sodium iron phosphate and calcium carbonate are efficiently prepared by adopting a sol-gel method and a precipitation method respectively. When the lithium iron phosphate and the composite sodium iron phosphate are prepared, the reaction process is controllable by regulating and controlling the oscillation condition, the reaction temperature, the pH value and the retention time, and a target product is obtained after the gel is calcined. When calcium carbonate is prepared, nucleation and crystallization are enhanced by controlling the flow rates of a precursor, a precipitator and a surfactant and combining oscillation. According to the method, mixed mass transfer is enhanced by means of periodic oscillatory flow, local supersaturation and concentration gradient are inhibited, reactant deposition and channel blockage are reduced, continuous and stable production is guaranteed, meanwhile, the use amount and cost of a surfactant are reduced, and accurate regulation and control over the particle size, morphology and distribution of the material are achieved. Compared with a traditional process, the preparation period is greatly shortened, the product purity and the reaction efficiency are improved, and the method is suitable for industrial continuous production and has remarkable economic benefits and social benefits.

This invention relates to the field of bio-based oil refining technology, and proposes an industrial-grade refining apparatus for mixed oils. The apparatus includes a mixing cylinder equipped with a stirring assembly and a wall-scraping auxiliary mechanism, and a drive mechanism at the top to drive the stirring assembly in a three-dimensional composite lifting motion. A disc centrifuge is located directly below the mixing cylinder, with a guide pipe fixed at its top, communicating with the bottom of the mixing cylinder. The bottom of the guide pipe has symmetrically arranged spiral guide channels and horizontal discharge ports. A disc assembly is coaxially arranged inside the disc centrifuge, with the gap between adjacent discs decreasing sequentially from bottom to top. This technical solution solves the problems in existing degumming processes, such as the large speed difference between long pipe conveying and centrifugal feeding leading to secondary breakage of fragile bio-phospholipid flocs, easy pipe blockage due to cooling, easy blockage at the bottom of traditional evenly spaced discs (for coarse separation), low purity at the top (for fine separation), and low mixing efficiency of traditional stirring structures.

The application discloses a special dust-settling agent under a tunnel construction environment and a preparation method thereof. The application relates to the field of dust-settling agent preparation under a tunnel construction environment, and solves the problems of high preparation cost, difficulty in large-scale production and limited dust-settling performance of the existing dust-settling agent preparation method. In the application, polyvinyl alcohol, guar gum and itaconic acid are subjected to graft copolymerization reaction under nitrogen protection at 60 DEG C-70 DEG C, N,N'-methylene bisacrylamide crosslinking agent is added to form a chemical crosslinking network, and then the chemical crosslinking network is compounded with a surfactant to obtain the dust-settling agent. The dust-settling agent does not need low-temperature freezing and thawing treatment, can significantly reduce equipment energy consumption and production cost, is convenient for industrialized production, has good film-forming property, moderate viscosity and long water-retention duration, and can efficiently inhibit diffusion of dust generated in tunnel construction.

This utility model relates to the field of high-temperature pyrolysis furnace processing technology, and discloses an intelligent stirring and dispersing device for a high-temperature pyrolysis furnace, comprising: a support assembly, on which a rectangular crucible is fixedly connected to the inner side of the support assembly; a planetary stirring and dispersing assembly, comprising: a fixed bushing, fixedly connected to the inside of a tank cover assembly; and a rotating shaft, rotatably connected to the fixed bushing, with a limiting plate fixedly sleeved on the top surface of the rotating shaft. This utility model device uses an explosion-proof motor to drive the rotating shaft, which in turn drives a rotating gear to mesh with a fixed rack, enabling the stirring rod to synchronously achieve rotation and lateral reciprocating motion, forming a "planetary" composite trajectory covering the entire area of ​​the rectangular crucible. Compared with traditional single-axial stirring, it can eliminate the stirring blind zone at the edge and bottom of the furnace, ensuring uniform force on granular materials and improving the sufficiency of the pyrolysis reaction and product quality.

The invention provides a synthetic method of cyclohexapeptide-9, and belongs to the technical field of skin care product raw materials. According to the synthesis method, single amino acid is taken as a starting raw material, and cyclic hexapeptide-9 shown in the formula (I) is efficiently prepared through step-by-step condensation by an activated ester method, orthogonal selective deprotection and coupling reaction. The method overcomes the problems of a solid-phase synthesis method, avoids the use of expensive dipeptide raw materials in an existing liquid-phase synthesis method, and has the advantages of low raw material cost, simple synthesis route, controllable side reaction, high product purity and easiness in process amplification. Formula (I)

The application belongs to the technical field of sodium hexafluorophosphate and particularly relates to a one-pot preparation process of sodium hexafluorophosphate. The one-pot preparation process of sodium hexafluorophosphate comprises the following steps: (1) reaction: anhydrous hydrogen fluoride is put into a reactor, a sodium source and a phosphorus source are sequentially added at a temperature of -60 to -20 DEG C, then the temperature is increased to 0 to 10 DEG C for reaction, volatile substances are evaporated after the reaction is completed, and a sodium hexafluorophosphate primary product is obtained; (2) neutralization: an organic solvent is added to the sodium hexafluorophosphate primary product for dissolution, then an alkaline substance is added to adjust the pH value of the solution system to 7 to 9, filtration is performed, a sodium hexafluorophosphate solution is obtained, the organic solvent is evaporated by increasing the temperature, and a sodium hexafluorophosphate crude product is obtained after drying. The one-pot preparation process has the advantages of mild conditions, simple operation, fast reaction rate, easy separation of the product, high purity and high yield of the prepared sodium hexafluorophosphate crude product, and is suitable for industrial production.

This invention belongs to the field of pharmaceutical synthesis and discloses a method for preparing carboxylated maltose iron, comprising: adding sodium carbonate solution to a mixture of carboxylated maltodextrin solution and ferric chloride solution in two separate additions, controlling the amount of sodium carbonate solution added in the first addition to be 20-40% of the total amount of sodium carbonate solution, and the time interval between the two additions of sodium carbonate solution to be 10-40 minutes, to obtain carboxylated maltose iron with the target molecular weight and molecular weight distribution coefficient. In actual production, this invention not only significantly reduces the reaction temperature but also significantly reduces the complexation reaction time, achieving the effect of shortening the reaction cycle and saving energy. While ensuring the acquisition of carboxylated maltose iron with the target molecular weight and molecular weight distribution, it conforms to the trend of energy conservation and environmental protection, and has significant practical value.

The present application relates to the technical field of organic synthesis, and particularly relates to an environment-friendly synthesis method of 6-chloro-2-hydroxyquinolin. The specific scheme is that p-chloro-o-nitroacetacetanilide is closed under the action of a certain concentration of liquid alkali, electrolytic reduction is used instead of traditional reductant reduction to prepare a sodium salt, and the sodium salt is subjected to acidification treatment to obtain a pyridyl-quinoline intermediate (6-chloro-2-hydroxyquinolin). The method greatly reduces the discharge of sulfur-containing wastewater, has mild reaction conditions, short reaction period, protects the environment, and reduces the cost of synthesizing the pyridyl-quinoline intermediate (6-chloro-2-hydroxyquinolin).

The application relates to the field of luminescent materials, in particular to a terbium stannum chlorate and a preparation method thereof. The preparation method of the terbium stannum chlorate comprises the following steps: taking stannous chloride dihydrate and a terbium salt as precursors, dissolving the precursors in a solvent at room temperature to form a solution A; performing spin coating on a substrate to form a film, and heating to obtain a terbium stannum chlorate film based on the substrate. The method has the advantages of simple preparation process, low requirement on equipment, high controllability, less heat budget in the preparation process, and excellent photoluminescence performance of the product.

This invention provides a method for producing sulfonylpyrazole and its intermediates. The method uses ethyl trifluoroacetoacetate as a raw material and synthesizes sulfonylpyrazole through steps including cyclization, O-difluoromethylation, chloromethylation, isothioureation, isothiourea hydrolysis, condensation, and oxidation. The product purity is ≥99.5%, content is >99%, and the overall yield exceeds 45%. The process of this invention eliminates column chromatography and crystallization purification, simplifying operations and shortening the production cycle. It solves the problems of high production cost, low product quality, and significant environmental impact associated with existing sulfonylpyrazole technologies. The technical solution of this invention improves product quality and yield, reduces costs, and increases production efficiency, providing technical support for the industrial production of sulfonylpyrazole.

The application relates to the technical field of cellulose derivative preparation, and discloses crosslinked sodium carboxymethyl cellulose and a preparation method thereof. The crosslinked sodium carboxymethyl cellulose is prepared from sodium carboxymethyl cellulose as raw material by adopting a disulfide crosslinking agent-epoxy chloropropane composite crosslinking system, and through raw material pretreatment, phosphoric acid catalytic activation, microwave-ultrasonic synergistic crosslinking, pH adjustment and anhydrous ethanol post-treatment. The composite crosslinking system forms a double crosslinking network, the microwave-ultrasonic synergistic strengthening reaction is uniform, and an additional impurity removal step is not needed. The application simplifies the process, reduces the cost, and the product has high light transmittance, large viscosity, excellent swelling degree and good substitution uniformity, and can be used for high polymer materials.

The invention relates to the technical field of high polymer materials, and discloses a water-based hybrid emulsion with high solid content, low gloss and high wear resistance and a preparation method thereof.The water-based hybrid emulsion is prepared from 12 kinds of components including composite isocyanate, composite polyol, composite acrylate monomers and the like. A three-in-one system of an interpenetrating network, a core-shell structure and multiple cross-linking is constructed through precise compounding, the synergism of 55-60% high solid content, 5-8 GU low gloss and high wear resistance is realized, the weather resistance of the product reaches 800 h without yellowing, the product is stable after being stored for 12 months, the product is environment-friendly and solvent-free, and the product can be widely applied to multiple scenes such as coatings, adhesives, leather finishing and the like and has wide application prospects. The problems that an existing water-based hybrid emulsion is single in structure, short in performance, high in solid content and difficult to be compatible with a complex structure are solved.

The application relates to an ethoxylation reaction stage temperature optimization control method, device, equipment and readable storage medium. The method comprises the following steps: obtaining an ethylene oxide feed flow cumulative amount as a reaction progress judgment benchmark; dividing multiple reaction stages according to the cumulative amount, and presetting a control parameter group for each stage; calculating the cumulative amount in real time, automatically switching the stage when a preset threshold is reached and a precondition is met, and the parameter group of each stage is executed only once; performing cascade control of the kettle bottom temperature and the feed flow according to a feed flow benchmark value to actively adjust the reaction heat release; and automatically switching a heat conduction oil control strategy without disturbance according to a heat conduction oil control mode. The method realizes self-adaptive control of ethoxylation reaction in stages, actively controls temperature from the source, overcomes the hysteresis of traditional passive heat removal, and improves temperature control precision and production safety. Moreover, the method is also suitable for strong exothermic and staged batch reaction processes of propoxylation or polyesterification.

The application discloses a high-entropy MOF derived oxygen reduction electrocatalyst and a preparation method and application thereof, and relates to the technical field of catalyst preparation. The preparation method of the oxygen reduction electrocatalyst comprises the following steps: (1) dissolving at least five kinds of transition metal salts and organic ligands in a solvent, and uniformly mixing to obtain an electrolyte; (2) adopting a three-electrode system, taking a conductive substrate as a working electrode, and performing cathodic electrodeposition in a constant current mode to form a high-entropy MOF precursor in situ on the surface of the working electrode; (3) powder collection; and (4) high-temperature calcination. The application first proposes a synergistic strategy of "electrochemical forced codeposition + in-situ defect introduction", and solves the dual technical problems of difficulty in atomic-level mixing of high-entropy MOF and low activity site density of the derived catalyst.

This invention belongs to the field of water treatment denitrification technology, specifically relating to a strain-piezoelectric material synergistic denitrification system and its application. This strain-piezoelectric material synergistic denitrification system includes *Streptomyces* denitrifying bacteria and barium strontium titanate, with the barium strontium titanate loaded on the surface of the *Streptomyces* denitrifying bacteria. This invention induces a piezoelectric effect in the barium strontium titanate through mechanical feeding, providing an electron donor for the *Streptomyces* denitrifying bacteria, thus improving electron transfer efficiency and consequently increasing denitrification efficiency. Experiments show that under optimal conditions of 0.5 g / L barium strontium titanate concentration and 400 r / min stirring speed, the total nitrogen and nitrate nitrogen removal rates of this system are higher than those of strain DD alone, while the total organic carbon removal rate is also significantly improved.