110 results about "Catalytic hydrolysis" patented technology

The invention discloses a phenanthridine-6-formaldehyde derivative and a preparation method and application thereof.The preparation method comprises the steps that 2, 4, 5, 6-tetra (9-carbazolyl)-isophthalonitrile serves as a photocatalyst, 1-azabicyclo [2.2. 2] octane serves as a hydrogen atom transfer catalyst, a biphenyl isocyanide compound, the photocatalyst, the hydrogen atom transfer catalyst and an alkali additive are jointly dissolved in 1, 3-dioxolane, the mixture is stirred to be uniform, and the phenanthridine-6-formaldehyde derivative is obtained. And carrying out free radical tandem cyclization and acid-catalyzed hydrolysis reaction to obtain the phenanthridine-6-formaldehyde derivative. The invention also provides a specific reaction equation. According to the developed synthesis method of the phenanthridine-6-formaldehyde derivative, the compound can be efficiently and conveniently prepared, the technical bottlenecks of harsh reaction conditions and tedious steps in a traditional process are successfully overcome, raw materials which are low in price and easy to obtain are adopted, operation is carried out under mild conditions, the synthesis method has the outstanding advantages of being high in yield, safe and simple to operate, environmentally friendly and the like, and the method is suitable for industrial production. Good industrial application potential is shown.

The invention discloses a gamma-glutamyl transpeptidase catalytic hydrolysis induced charge upset polymer, which contains a gamma-glutamyl transpeptidase response element part and a fluorescent probe corresponding fragment part, the invention also discloses a preparation method of the polymer for turning charge by catalytic hydrolysis of gamma-glutamyltranspeptidase and an application method of the polymer in the field of tumor imaging. According to the present invention, the gamma-glutamyltranspeptidase catalytic hydrolysis electric charge overturning polymer is adopted as the response type tumor imaging probe, such that the electric charge can be converted from the negative or neutral state to the positive state so as to achieve the rapid uptake of the positively charged polymer by the tumor cells so as to achieve the rapid spraying imaging, and the probe response after the uptake is adopted so as to achieve the rapid spraying imaging; the imaging effect of the probe on the tumor is greatly improved, and the probe has important significance in solid tumor imaging for assisting a doctor in surgical resection.

The invention relates to the technical field of wastewater treatment, and discloses a modular electro-catalytic hydrolytic acidification reaction device and a wastewater treatment method. The modularized electro-catalysis hydrolytic acidification reaction device comprises a hydrolytic acidification area, an electro-catalysis area, a backflow system and a solar power supply system, the backflow system comprises a backflow pipe and a backflow channel, outlet water of the hydrolytic acidification area flows into the electro-catalysis area through the backflow pipe, and outlet water at the tail end of the electro-catalysis area flows into the hydrolytic acidification area through the backflow channel, the electro-catalysis area comprises a plurality of electro-catalysis modules which are electrically connected, each electro-catalysis module comprises an electrode assembly and an aeration device, each electro-catalysis module is divided into a micro-aerobic area and an anoxic area, and the micro-aerobic areas and the anoxic areas are alternately and continuously arranged. When the reaction device is used for treating wastewater, the function of synchronous nitrification and denitrification efficient nitrogen removal can be realized, the organic matter removal efficiency in the hydrolytic acidification stage is improved, and the biodegradability of sewage is enhanced.

The present application relates to a kind of anti-poisoning catalyst for blast furnace gas organic sulfur hydrolysis and its preparation method.Each component is as follows in percentage by weight: active component K2CO3 4-12%;Active component Cs2CO3 2-5%;Catalyst aid MoO3 3-8%;Catalyst aid La2O3 0.5-2%;Molding aid SiO2 1-5%;And composite metal oxide carrier Al2O3-TiO2 68-89.5%, the pore size of the composite metal oxide carrier Al2O3-TiO2 is three channel distribution.First, composite metal oxide carrier is prepared, and after being formed with silicon dioxide, active component and catalyst aid are impregnated to prepare catalyst.The catalyst prepared by the present application has excellent catalytic hydrolysis activity for organic sulfur in blast furnace gas, and has anti-sulfur, anti-chlorine and anti-oxygen poisoning performance and has persistent catalytic oxidation activity.

The invention relates to a catalytic hydrolysis method of waste epoxy resin, which comprises the following steps: putting the waste epoxy resin into a reaction kettle, adding ultrapure water, adding a small amount of sodium dodecyl diphenyl ether disulfonate surfactant and a boron trifluoride acetic acid catalyst, and carrying out hydrolysis reaction to realize catalytic degradation of the epoxy resin. Degradation products can be converted into epoxy monomers and anhydride monomers, so that cyclic utilization is realized. Compared with the prior art, the degradation method provided by the invention is not only green and safe, but also high in degradation efficiency, solves the problem that the waste epoxy resin cannot be recycled, saves resources, meets the green development requirement, and has practical engineering application value.

The invention discloses a method for catalyzing hydrolysis of hexafluorophosphate radicals by using a bifunctional solid acid material, the main active sites of the bifunctional solid acid material in the method are a Brnsted acid site formed by combining protonated sulfate radicals (HSO4 <->) with hydroxyl groups on the surface of TiO2 and a Ti < 4 + > (Lewis acid) site enhanced by induction of the Brnsted acid site, and in the catalytic hydrolysis process, the Brnsted acid site and the Ti4 < + > (Lewis acid) site can be used for catalyzing hydrolysis of the hexafluorophosphate radicals by using the bifunctional solid acid material. Ti4 < + > (Lewis acid site) generates strong adsorption and activation effects on PF6 <->, adjacent HSO4 <-> (Brnsted acid site) and PF6 <-> generate H.. F-P interaction, and the two sites apply a synergistic stretching effect on a P-F bond from different directions, so that a stable regular octahedron structure of PF6 <-> is greatly damaged, a reaction energy barrier of P-F bond breakage is remarkably reduced, efficient hydrolysis of PF6 <-> is realized, and the reaction time is shortened. The method has the advantages that the hydrolysis efficiency is high, the hydrothermal stability is good, extreme acid and alkali environments are not needed, the bifunctional catalyst is easy to regenerate and the like, and a brand new technical path and a solution are provided for harmless treatment of the hexafluorophosphoric acid-containing wastewater.

This invention proposes a method for synthesizing glyoxylic acid from methyl glycolate. Using methyl glycolate and oxygen / water as raw materials, glyoxylic acid is produced in a one-step process. This invention employs a novel catalyst based on ZSM-5 molecular sieve, modified with transition metals and organic bases, and finally extruded into strips. This catalyst can catalyze both oxidation and hydrolysis. This route is characterized by its simplicity, high reactivity, and high catalytic selectivity, making it a green route for glyoxylic acid synthesis.

The invention provides a transformer oil acetylene degassing-free detection method and system based on click chemistry, and relates to the technical field of gas detection analysis, a first product generated by a first click chemical reaction and a second product generated by a second click chemical reaction are used as catalysts to trigger a subsequent same cascade chemical amplification reaction, and the detection result is accurate. A single product molecule can catalytically hydrolyze a large number of acid-sensitive substrates, the conductivity of a mixed solution is obvious and can be measured and changed, accurate detection of acetylene with extremely low concentration is realized, and meanwhile, acetylene detection is calculated by utilizing a second click chemical reaction synchronously generated by an internal standard reagent and a triggering agent and independent of an acetylene concentration detection process, so that the accuracy of acetylene detection is improved. According to the method, the signal ratio is obtained by calculating the ratio of the first electric signal value to the second electric signal value instead of the single first electric signal value, interference factors are offset, online self-correction of acetylene detection is realized, and high consistency and accuracy of detection results under different times and different batches of reagents are ensured.

The present application belongs to the technical field of phosgene reaction tail gas treatment, and particularly relates to a phosgene tail gas alkali destruction device and method, which comprises the following steps: an operator passes the tail gas into a falling film absorber, the falling film absorber absorbs hydrochloric acid in the tail gas to obtain treated gas one; the treated gas one is passed into a catalytic hydrolysis box, a catalytic hydrolysis method is used to destroy phosgene in the treated gas one to obtain treated gas two; the treated gas two is passed into a multi-stage alkali destruction tower, 1% to 10% of a dilute alkali solution is sent into the top of the alkali destruction tower through a delivery pump, inorganic salt solution and treated gas three are generated through an acid-base reaction; the inorganic salt solution is sent to a high-salt wastewater treatment device for treatment, the treated gas three is sent to a burning device for treatment to remove unreacted carbon monoxide, organic matter and other combustible gases to obtain final gas which is discharged to the outside. The scheme solves the problem of waste caused by a large amount of generated high-salt wastewater.

The present application belongs to the technical field of fine chemical industry and water-based paint, and particularly relates to a use of adipic acid bis(1-butoxy-2-propyl) ester as a film-forming aid, a preparation method and a water-based paint composition. In view of the requirement of water-based paint for SVOC limit and the pain point that long open time and high paint film strength are difficult to be achieved simultaneously, constant azeotropic esterification is adopted to prepare non-SVOC odor-free target ester compounds. When the ester compounds are applied to water-based paint, the film-forming aid utilizes the specific large secondary methyl of the molecule to construct steric hindrance, effectively blocks the nucleophilic attack of hydroxyl ions, and solves the problem of alkaline catalytic hydrolysis of paint. The adipic acid bis(1-butoxy-2-propyl) ester has the following structure:

The application belongs to the technical field of barium compound preparation, and relates to a preparation method of nano barium sulfate. The method adopts an in-situ degradable dispersant based on a natural polysaccharide derivative, adsorbs on the surface of a barium sulfate crystal nucleus through a functional group in the reaction to inhibit agglomeration, adjusts the pH to 3.0-6.0 after the reaction is completed, and acid-catalytically hydrolyzes the dispersant into a water-soluble small molecule, so that a high-purity and high-dispersibility product can be obtained through simple water washing. The application introduces a natural polysaccharide derivative with a crystal face selective adsorption capacity and an acid-triggered degradation characteristic as an in-situ degradable dispersant, and constructs a new green preparation paradigm of nano barium sulfate with reaction-dispersion-self-cleaning integration. The method fundamentally eliminates the risk of organic impurity residue without sacrificing the dispersing performance, significantly improves the product purity and application safety, simultaneously simplifies the post-processing technology, reduces the energy consumption and wastewater treatment cost, and has both technical advancement and industrialization feasibility.

The invention discloses a method for asymmetrically synthesizing a ferruginactone II (ferruginactone II) of a cryptolepsis rusteri gather pheromone. The method comprises the following steps: by taking octyl-1-alkyne as a starting raw material, firstly, carrying out amide reaction on octyl-1-alkyne and Weinreb to prepare deca-3-alkyne-2-ketone; then, carrying out Corey-Bakshii-Shibata reduction and alkyne zipper reaction to synthesize (S)-decane-9-alkyne-2-alcohol, and carrying out a reaction on the (S)-decane-9-alkyne-2-alcohol and an alkyne zipper; then carrying out catalytic hydrogenation with NiAc2 / NaBH4 by utilizing a coupling reaction, so as to prepare (S, Z)-11-hydroxydodecane-3-olefine acid ethyl ester; and finally, carrying out catalytic hydrolysis by using lithium hydroxide, and carrying out an esterification reaction with Yamaguchi, so as to prepare the pyrethroid aggregation pheromone ferrulactone II (1). The method has the advantages of high total yield, simple synthetic route and the like.

The invention relates to the technical field of organic silicon materials, and discloses sulfydryl silicon resin, application thereof and an organic silicon pressure-sensitive adhesive, the sulfydryl silicon resin is obtained by catalyzing hydrolysis and polycondensation of an M-chain-link silane monomer, a T-chain-link silane monomer and a Q-chain-link silane monomer in an isopropanol aqueous solution of strong acid; the organic silicon pressure-sensitive adhesive is synthesized from sulfydryl silicon resin, double-end vinyl silicone oil and a free radical photoinitiator; the sulfydryl silicon resin is prepared from a silane end-capping reagent, sulfydryl silane, tetraethoxysilane and the like; a sulfydryl group is grafted to a silicon resin side chain to prepare the light-cured sulfydryl silicon resin, after light curing, the light-cured sulfydryl silicon resin can meet the application requirements of a light-cured organic silicon pressure-sensitive adhesive by utilizing a chemical reaction between sulfydryl and vinyl, and the problems of oxygen inhibition and the like existing in an acrylic acid light curing system are solved.

The invention relates to the field of biopesticides, in particular to a method for synthesizing sex pheromone of pinus tabulaeformis, which comprises the following steps: reacting 1-bromo-n-heptane (3) serving as an initial raw material with magnesium, and then reacting with (R)-epoxypropane (4) to obtain chiral alcohol 5; then reacting with paratoluensulfonyl chloride, and then reacting with dimethyl malonate to obtain malonate 7; carrying out sodium hydroxide catalytic hydrolysis and high-temperature decarboxylation to obtain an acid 8, and carrying out lithium aluminum hydride reduction and NBS bromination to obtain a chiral bromide 10; reacting with magnesium, and reacting with sulfonate 12 to obtain silyl ether 11; then carrying out TBAF deprotection to obtain chiral alcohol 13; and finally, reacting the chiral alcohol 13 with acetic acid to obtain acetic acid (2S, 3S, 7S)-3, 7-dimethyl-2-pentadecanol ester (1), and reacting the chiral alcohol 13 with propionic acid to obtain propionic acid (2S, 3S, 7S)-3, 7-dimethyl-2-pentadecanol ester (2). The method has the advantages of high total yield, low synthesis cost and the like.

The invention belongs to the crossing field of metal organic framework crystalline materials and chemical protection, and discloses a metal organic framework crystalline material containing an N-ethyl morpholine buffer system and a preparation method and application thereof. A carboxylic acid ligand containing an N-(2-aminoethyl) morpholine group and metal ions M < 4 + > ions (M = Zr, Hf, Ce and the like) or MO < 2 + > ions or metal clusters M6 (mu3-O) 4 (mu3-OH) 4 are assembled to prepare the crystalline porous metal organic framework material containing an N-ethylmorpholine (NEM) buffer system and having a specific topological structure (fcu, spn, csq, kgd and the like), and the crystalline porous metal organic framework material is called MOFs-NEM for short. The main representative materials comprise M-MOF-808-xNEM (M = Zr, Hf, Ce) (x = 1, 2, 3), M-UiO-66-NEM, M-UiO-67-NEM, M-UiO-68-xNEM (x = 1 and 2), M-BTB-xNEM (x = 1, 2 and 3), M-NU-1000-4NEM and the like. The MOFs-NEM meets the requirements of catalytic hydrolysis of organophosphorus ester on a high-accessibility catalytic active center and a buffer system, and realizes efficient catalytic hydrolysis of the organophosphorus ester nerve poison in a humidity environment.

This invention relates to the field of biomedical technology, specifically to the use of the N-terminal fragment of insulin-like growth factor binding protein-4 (IGF-4) in the clinical assessment of heart failure and coronary artery disease. The N-terminal fragment of IGF-4 is obtained by catalytic hydrolysis of IGF-4 by pregnancy-associated plasma protein A. Clinical assessment of heart failure includes diagnosing or assisting in the diagnosis of heart failure, or assessing or assisting in the prognostic risk of heart failure. Clinical assessment of coronary artery disease includes assessing or assisting in the prognostic risk of coronary artery disease. By detecting the content of the N-terminal fragment of IGF-4 in a sample, heart failure can be diagnosed or assisted in the diagnosis, and the prognosis of heart failure and coronary artery disease can be assessed or assisted in, demonstrating good clinical assessment efficacy.

This invention belongs to the field of pharmaceutical formulation technology and discloses a tenofovir prodrug tablet, its preparation method, and its application. The tablet is made from components comprising the following weight percentages: active pharmaceutical ingredient 2.0%-10.0%, non-hygroscopic backbone 60.0%-80.0%, mesoscopic buffer complex flow aid 2.0%-8.0%, in-situ water trap 3.0%-8.0%, and non-alkaline lubrication system 1.0%-3.0%. In this invention, the mesoscopic buffer complex flow aid is anchored around the active pharmaceutical ingredient to form a bound water buffer membrane with a uniform microenvironment pH. A solid-phase water activity gradient is formed between the in-situ water trap and this bound water buffer membrane. Driven by the chemical potential difference, free water in the system undergoes directional migration and is targeted and locked. This invention blocks the catalytic hydrolysis pathway of the active pharmaceutical ingredient under acidic and alkaline conditions, and simultaneously cuts off the hydrolysis mediator pathway caused by free water, thereby improving the chemical and physical stability of the tablet.

The invention belongs to the technical field of chemical synthesis, and discloses a method for synthesizing fatty diol from straight-chain fatty olefin through a one-pot method under catalysis of titanium silicalite molecular sieve loaded sulfate. Through metal sulfate modification, acid sites on the surface of the titanium silicalite molecular sieve are increased, so that the catalytic epoxidation function of tetra-coordinated titanium and the catalytic hydrolysis function of the acid sites have a synergistic effect, and olefin epoxidation-epoxide hydrolysis reactions are connected in series. According to the process, olefin can be almost completely converted, and the problem of raw material recovery does not need to be considered. The bifunctional catalyst is used for preparing 1, 2-pentanediol from 1-pentene through a one-pot method, the conversion rate of 1-pentene is larger than 98%, the yield of 1, 2-pentanediol is larger than 77%, intermediate separation and additional acid and alkali are not needed in the whole process, the equipment corrosion risk is reduced, the problems of environmental pollution and complex process of a traditional process are solved, and the catalyst can be recycled and reused for multiple times.

The invention discloses a method for preparing a Si (at) MOF composite hierarchical pore silicon-based negative electrode material based on a gel method, and belongs to the technical field of lithium ion battery negative electrode materials. The method specifically comprises the following steps: (1) pretreatment; (2) diatomite activation; (3) preparing an MOF precursor solution; (4) growing ZIF-8 in situ; (5) pre-dispersing; (6) catalytic hydrolysis; (7) cross-linking a polymer network; (8) aging and strengthening; (9) directional freezing; (10) gradient drying; (11) a pyrolysis procedure; (12) a zinc vapor recovery system; and (13) performing acid activation and chambering. According to the preparation method, high-valued utilization of the silicon waste is realized through bionic multilevel structure design and a green process, and a three-dimensional conductive network with macroscopic vertical pore channels, mesoscopic diatomite pores and a microcosmic ZIF-8 derived carbon cage confinement is synchronously constructed, so that the ion transmission efficiency, the structural stability and the electrochemical performance of the material are remarkably improved; meanwhile, hydrofluoric acid and other high-risk reagents are avoided, and environmental and safety risks are reduced.

The invention relates to the technical field of papermaking, and provides paper containing a composite reinforcing material and a preparation method of the paper. The preparation method comprises the following steps: S100, adding a silane precursor and an acid catalyst into a solvent, and adding silicon dioxide nanoparticles to obtain composite nano sol; s200, dispersing the paper pulp in water to form slurry, and adding a reinforcing agent and an inorganic filler into the slurry to obtain fiber slurry; s300, carrying out net forming, squeezing and preliminary drying treatment on the fiber pulp to obtain a paper base material; s400, coating the surface of the paper substrate with silane hydrolysate to form a silane bonding layer; and coating the composite nano sol on the surface of the silane bonding layer to obtain the paper. The silane precursor is catalyzed and hydrolyzed by acid to generate active silanol, the nano silicon dioxide sol is introduced, condensation of silanol, hydroxyl on the surface of the fiber and nano silicon dioxide is promoted through heat treatment, a composite reinforced layer is formed, and therefore the mechanical strength, surface smoothness, water resistance and printability of the paper are improved.

This invention discloses a method for the catalytic hydrolysis of 3,3'-oxybis(cyclohexane-2-en-1-one) using carbon materials. Under the action of a bio-carbon-supported potassium-magnesium oxide catalyst rich in strongly basic sites, 3,3'-oxybis(cyclohexane-2-en-1-one) undergoes a hydrolysis reaction to produce 1,3-cyclohexanedione. The raw material 3,3'-oxybis(cyclohexane-2-en-1-one) is a byproduct of the resorcinol process for preparing 1,3-cyclohexanedione, and is inexpensive and readily available. The catalytic hydrolysis of 3,3'-oxybis(cyclohexane-2-en-1-one) to produce 1,3-cyclohexanedione achieves value-added processing of byproducts from the CHD industry, reduces solid waste generation, lowers the production cost of 1,3-cyclohexanedione, and has significant socio-economic benefits.

The utility model discloses an on-line catalyst filling mechanism for a urea catalytic hydrolysis reactor, which comprises a screw pump and a feeding seat disc, the feeding seat disc is mounted at a feeding port of the screw pump, the on-line catalyst filling mechanism further comprises a vibration filling mechanism, and the vibration filling mechanism used for filling a catalyst in a vibration manner is mounted at a disc body of the feeding seat disc. The vibration injection mechanism comprises a flange base disc, a material injection pipe, a rubber insertion strip, a supporting plate, a core column and a vibration motor, the flange base disc is installed at the feeding base disc through bolts and nuts, and the vibration injection mechanism is arranged at the position of a screw pump for online catalyst injection of the urea catalytic hydrolysis reactor to form the injection mechanism. Particularly, due to the introduction of the vibration motor, the catalyst in the material injection pipe can be effectively vibrated, the catalyst is promoted to smoothly enter the screw pump from the material injection pipe, and the catalyst is ensured to efficiently and continuously enter the screw pump to be conveyed into the urea catalytic hydrolysis reactor.

The invention discloses a fluorescent substrate 7-HC-P-E, a preparation method thereof and application of the fluorescent substrate 7-HC-P-E in detection of the active concentration of alkaline phosphatase (ALP). The fluorescent substrate can be catalytically hydrolyzed by ALP under an alkaline condition to release 7-hydroxycoumarin (7HC) with a strong fluorescent signal, so that high-sensitivity and high-specificity detection on the enzyme activity is realized. The invention further provides a synthesis route and an optimization process of the fluorescent substrate, the operation is simple and convenient, the product purity is high, and the fluorescent substrate is suitable for multiple fields such as biological analysis, medical diagnosis and environmental monitoring.

The invention discloses a method for increasing the content of sulforaphane in broccoli through magnetic field assisted blanching, and belongs to the technical field of food processing. The method for improving the content of sulforaphane in broccoli through magnetic field assisted blanching comprises the following steps: (1) preparing raw materials; (2) magnetic field assisted blanching pretreatment; (3) cooling and structure keeping treatment; (4) carrying out enzymatic incubation based on a magnetic field-assisted blanching regulation state; and (5) obtaining the broccoli product with high sulforaphane content. Exogenous enzymes, chemical reagents or additives are not introduced in the process, and the activity of endogenous myrosinase and the catalytic hydrolysis path of the endogenous myrosinase are regulated by synchronously applying a physical regulation means in the blanching pretreatment process, so that the generation level of sulforaphane in a treated sample is improved. The method is suitable for a food processing system, has the advantages of mild process conditions, strong controllability, high safety and easiness in industrial amplification, and has a wide application prospect in the field of food processing.

This invention discloses a method for preparing diglycerides using an immobilized enzyme from ultrafine pulverized plant protein, relating to the field of food engineering technology. The method employs a high-energy media mill to co-mill plant protein and chitosan to prepare a composite material with a porous network structure. This composite material is then mixed with a lipase solution to immobilize the lipase within the composite material, obtaining an immobilized enzyme. This immobilized enzyme is used as an emulsifier, and vegetable oil as a reaction substrate is added. A Pickering emulsion is prepared using a high-speed shear mill, followed by catalytic hydrolysis of the vegetable oil in a constant-temperature water bath to obtain the diglyceride product. This system improves enzyme catalytic efficiency, achieving a diglyceride content of over 45% after 30 minutes of reaction, and maintaining over 40% even after eight repetitions. The immobilized enzyme carrier of this invention uses inexpensive natural food raw materials, is simple to prepare, highly safe, produces minimal pollution, and allows for continuous production. Furthermore, the prepared Pickering emulsion exhibits good stability, which is beneficial for the clean production of diglycerides and has excellent industrialization potential.

The utility model discloses an evaporation separator for chemical production, relates to the technical field of evaporation separators, and is used for solving the problem that a urea hydrolysis system is easily blocked due to the fact that a high-concentration urea aqueous solution is easily heated to generate water-insoluble biuret and other condensation compounds. The interception assembly is installed on an original catalytic hydrolysis reactor, the interception assembly is used for blocking impurities in the ventilation process, and the flushing assembly is arranged for regular cleaning, so that the probability that a pipeline is blocked in the ammonia gas preparation process is reduced, the whole flushing time of the pipeline is prolonged, and the production efficiency is improved. The device is specifically composed of a first separator and a second separator, a transmission case drives a rotating shaft to rotate, the rotating angle of a first baffle disc and the rotating angle of a second baffle disc are changed, and when the ventilation end of the catalytic hydrolysis reactor is switched and a connecting rod fixed to the air cylinder end extrudes a complete set of hanging plates, a large-area intercepting space formed by combining the hanging plates is used for intercepting impurities.

The invention provides a preparation method of hydrazine hydrate, which comprises the following steps: in the presence of a catalyst and under reaction conditions, introducing methyl ethyl ketazine and water into a reaction section of a composite rectifying tower for contact reaction, and then continuously producing a hydrazine hydrate solution from a tower kettle. The preparation method of hydrazine hydrate provided by the invention can catalytically hydrolyze methyl ethyl ketazine under low-temperature and low-pressure reaction conditions, and meanwhile, the concentration and yield of hydrazine hydrate are improved.

The utility model discloses a packing type urea catalytic hydrolysis device which comprises a hydrolysis reaction kettle body and an air inlet pipe, the air inlet pipe is installed at the position of a shell at the air inlet end of the hydrolysis reaction kettle body, and the packing type urea catalytic hydrolysis device further comprises a pipe heating mechanism. A heat preservation space formed by a heat preservation core cylinder, a pressing ring, a protective cylinder and a base cushion block of the pipe warming mechanism can be protected on the outer side of an air inlet pipe, when steam enters the air inlet pipe, part of the steam can enter a coiled through pipe along an inserting pipe, heat dissipated by the coiled through pipe can be preserved in the heat preservation space, and the heat is kept on the outer side of the air inlet pipe; the steam heat in the air inlet pipe is effectively prevented from being reduced, a good pipe heating effect is achieved on the air inlet pipe, it is guaranteed that the temperature of the air inlet pipe is stable when steam enters the air inlet pipe subsequently, and then stable operation of the urea hydrolysis reaction kettle is guaranteed.

The invention belongs to the technical field of fine chemical engineering and environmental protection, and particularly relates to a system and method for catalytically synthesizing calcium formate by purifying carbon monoxide from yellow phosphorus tail gas. The system comprises a yellow phosphorus tail gas purification unit, a catalytic slurry preparation unit and a calcium formate synthesis refining unit. The method comprises the following steps: carrying out alkali washing, catalytic hydrolysis and dry desulfurization on yellow phosphorus tail gas, and carrying out simplified pressure swing adsorption to obtain an industrial-grade CO product gas; the method comprises the following steps: performing efficient synthesis on CO product gas and calcium hydroxide slurry containing an insoluble immobilized bifunctional catalyst in an airlift loop reactor under the conditions that the pressure is 3.5-7.0 MPa and the temperature is 110-170 DEG C; and recovering the catalyst from the reaction slurry through a hydrocyclone and a filter press in two steps, and refining the filtrate to obtain calcium formate. Through innovative matching of low-cost combined purification and efficient immobilized catalytic synthesis, the contradiction between high purification cost and low synthesis efficiency in the prior art is solved, the catalyst is easy and convenient to recycle, and the economical efficiency and industrial feasibility of the process are greatly improved.

The application provides an organic phosphorus poisoning relief composite enzyme and application thereof, and belongs to the technical field of biological medicine. The organic phosphorus poisoning relief composite enzyme provided by the application comprises polyethylene glycol modified organic phosphorus hydrolase and butyrylcholine esterase, and the mass ratio of the polyethylene glycol modified organic phosphorus hydrolase to the butyrylcholine esterase is (4-8):(2500-10000). The rat acute organic phosphorus poisoning treatment result shows that the organic phosphorus poisoning relief composite enzyme provided by the application fully plays the efficient catalytic hydrolysis capacity of the enzyme as a catalyst, efficiently removes organic phosphorus and acetylcholine by using the organic phosphorus hydrolase and the butyrylcholine esterase respectively, provides a drug combination for treating the cause for the organic phosphorus poisoning injury first aid, and the treatment effect is significantly better than that of the single drug.