48 results about "Catalytic cycle" patented technology

The invention discloses a superconducting carbon black co-production method based on directional refining of catalytic slurry oil and a product thereof, and belongs to the technical field of carbon black preparation, and the method comprises the following steps: mixing the catalytic slurry oil and catalytic circulating oil to obtain mixed slurry oil, and adding a deliming agent for settling separation to obtain purified slurry oil; carrying out continuous solvent extraction on the obtained purified oil slurry to respectively obtain an aromatic component and a heavy component; carrying out thermal polycondensation reaction on the obtained aromatic component in a magnetic field environment in the presence of a catalyst and a cross-linking agent, and then carrying out supercritical fluid extraction to obtain spinnable mesophase pitch; carrying out slurry reactor hydrogenation deconstruction on the obtained heavy component to obtain stable micromolecular carbon black raw oil, mixing the carbon black raw oil with a nitrogen source and a template precursor, carbonizing, and carrying out acid pickling to obtain the superconducting carbon black; through a heavy oil slurry reactor hydrogenation deconstruction'doping-template 'synergistic carbonization strategy, the superconductive carbon black with nitrogen / phosphorus co-doped and developed hierarchical porous structure is constructed in situ by a one-step method.

This invention discloses a method for synthesizing a full-carbon quaternary carbocyclic ketone-spirocyclic pseudoindole derivative. This method uses a metal carbonyl compound as a safe carbonyl source and involves a catalytic cycle from zero-valent palladium to divalent palladium. Specifically, it involves the oxidative addition of palladium(O) via a carbon-halogen bond, the coordination and migration insertion of CO to form a carbonyl palladium species, followed by nucleophilic attack of the indole C3 ring to achieve dearomatization of the indole ring, and then reductive elimination to obtain the full-carbon quaternary carbocyclic ketone-spirocyclic pseudoindole derivative. Specifically, compound 1 and the metal carbonyl compound Co2(CO)8 are reacted under heating conditions with palladium as a catalyst, organophosphine as a ligand, and sodium salt as a base to obtain the full-carbon quaternary carbocyclic ketone-spirocyclic pseudoindole molecule. This method is a novel synthetic method for full-carbon quaternary carbocyclic ketone-spirocyclic pseudoindole derivatives, solving the problems of existing technologies such as the need for multiple reaction steps, harsh reaction conditions, narrow substrate range, and high toxicity of starting materials.

The invention discloses a Zr-based metal organic framework containing squaramide groups and a preparation method and application thereof, and the preparation method comprises the following steps: adding tetra-coordinated carboxylic acid ligands H4HPA, H4TPCB or H4NDTB, ZrCl4 and benzoic acid into N, N-dimethylformamide, and carrying out solvothermal reaction to generate crystalline products Zr-MOF-1, Zr-MOF-2 and Zr-MOF-3; adding the obtained Zr-MOFs crystals into a DMF (Dimethyl Formamide) solution containing SQ ligands, and standing in a drying oven at 120 DEG C for two days to enable the SQ ligands to be inserted into unsaturated coordination sites of Zr6 clusters of the three MOFs, so as to obtain Zr-MOF-1-SQ, Zr-MOF-2-SQ and Zr-MOF-3-SQ; according to the present invention, the synthesized Zr-MOF-1-SQ, Zr-MOF-2-SQ and Zr-MOF-3-SQ have advantages of excellent chemical stability, accurately controllable catalytic activity center and excellent heterogeneous catalytic performance, and can maintain the structural integrity after multiple catalytic cycles, and the synthesis method is simple, convenient and controllable so as to solve the problem of poor stability of the traditional transition metal-based squaramide MOFs.

The invention discloses a light-driven nitrogen cycle pyrolysis-gasification biomass graded utilization system and method, and relates to the technical field of biomass graded utilization, the system comprises a pretreatment unit, a light-driven nitrogen-doped pyrolysis reactor and a photocatalytic nitrogen de-intercalation gasification reactor as core parts, an energy collection unit and a post-treatment unit. The method comprises condensation ammonia-doped pyrolysis and condensation gasification: pretreated biomass is subjected to condensation ammonia-doped pyrolysis in a pyrolysis section to generate high-activity nitrogen-doped coke and hydrogen, then the nitrogen-doped coke enters a gasification section to be subjected to condensation gasification, under the action of high-concentration water vapor, nitrogen elements in the coke are deintercalated, more active sites are released, NH3 is generated at the same time, and the nitrogen-doped coke enters the gasification section to be subjected to condensation gasification; the nitrogen can flow back to the pyrolysis zone for cyclic utilization, and a nitrogen doping-de-intercalation catalytic cycle process is formed. The light-driven nitrogen cycle grading technology is adopted, efficient doping of nitrogen elements at the high temperature is achieved, high-activity nitrogen-doped coke is generated, and production of high-quality synthesis gas and cyclic utilization of nitrogen are achieved.

The invention discloses a cerium-based photosensitizer, a preparation method and application of the cerium-based photosensitizer in photocatalytic reaction, and relates to the technical field of coordination chemistry and photocatalysis. The general formula of the cerium-based photosensitizer is Ce (L1) 3 (L2) m, and L1 comprises a strong field anion ligand of at least one strong electron withdrawing group or a strong field anion ligand of a rigid structure; l2 is a neutral nitrogen-containing heterocyclic ligand, and m is 0 or 1. According to the invention, strong visible light absorption and long excited state life can be achieved by introducing L1, and the Ce < + > / Ce < 4 + > oxidation potential can be reduced to a mild range, so that the Ce < 4 + > intermediate can be efficiently reduced by a mild reducing agent generated in the reaction, and simple catalytic circulation without an external reinforced reducing agent is realized. When being applied to boronation reaction of various alkenyl / aryl / heteroaryl halides and various organic boron reagents, the photosensitizer shows high catalytic activity (the yield is as high as 91%), the performance is superior to that of a noble metal photosensitizer, but the cost is remarkably reduced, and the photosensitizer is environment-friendly.

The invention relates to a biochar-loaded nano zero-valent iron repair material as well as a preparation method and application thereof. The biochar loaded nano zero-valent iron repair material is prepared from a persulfate-biochar carrier and metal sulfide modified composite acid stabilized nano zero-valent iron sol, the composite acid is composed of gallic acid and humic acid / fulvic acid; the preparation method comprises the following steps: S1, preparing a persulfate-biochar carrier; and S2, preparing the biochar loaded nano zero-valent iron repair material. The method is applied to groundwater chlorohydrocarbon pollution remediation. According to the method, in the reductive dechlorination process of the nano zero-valent reduced iron, released Fe < 2 + > can strengthen persulfate, Fe < 2 + > is regenerated by utilizing the reduction effect of gallic acid on reacted Fe < 3 + >, and catalytic circulation of iron is maintained; humic acid / fulvic acid is used for efficiently driving the degradation process; and metal sulfide is utilized to catalyze reduction of organic chlorine chemicals, so that the reductive dechlorination performance of the nano-iron material is improved, and the repairing effect of chlorinated hydrocarbon is optimized.

This invention discloses a Co-Mn LDH@N-MWCNT nano-confined catalytic ceramic membrane, its preparation method, and its application, belonging to the field of wastewater purification and advanced oxidation technology. This invention combines Co-Mn LDH and N-MWCNT to form a composite catalyst, which is then loaded onto a porous ceramic membrane, thereby constructing a highly efficient catalytic-separation system. The metal ions in Co-Mn LDH provide abundant catalytic active centers, synergistically activating oxidants to generate free radicals; N-MWCNTs serve as a conductive framework, accelerating electron transport and promoting catalytic cycling, while their nitrogen-doped sites enhance hydrophilicity and dispersibility. Finally, the composite catalyst forms a nano-confined environment within the pores of the porous ceramic membrane, which can efficiently concentrate pollutants and reactants, prolonging their contact time with the active sites, thus achieving in-situ efficient degradation of pollutants during membrane filtration.

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.

The application discloses a supported gold-silver alloy nanocluster composite catalyst and application thereof in catalyzing N-formylation of amine. 13 Ag 12 (PPh2Py) 10 Cl8] + (PF6) ‑ wherein PPh2Py is diphenyl-2-pyridine phosphine. The catalyst is used in N-formylation of amine, the yield reaches 88%, catalytic conditions are mild, the catalyst is easy to recycle and can be used for multiple catalytic cycle experiments, and the catalyst is suitable for various amines, thereby providing a reference for selection of a catalyst for subsequent N-formylation.

The invention provides a method for constructing a Cas13a autocatalytic circuit biosensor initiated by precursor crRNA (Complementary Ribonucleic Acid) self-treatment. The sensor is mainly composed of a precursor crRNA (Complementary Ribonucleic Acid) and a switch template with double UUU cutting sites. The precursor crRNA is subjected to engineering design, the structure of the precursor crRNA comprises a target antisense sequence, after target combination, the precursor crRNA is assembled with Cas13a to generate self-treatment, uracil is preferentially cut, and a double-chain fragment with a cohesive end is released. The fragment is hybridized with a spacer region at the 3'end of a precursor crRNA, and then a Cas13a compound with trans-cleavage activity is assembled. After the compound is activated, double UUU sites of switch template are specifically cut, and T7RNA polymerase mediated cascade signal amplification is triggered, so that a'treatment-assembly-amplification 'autocatalytic circulation loop is formed. The design effectively inhibits off-target cleavage caused by non-specific sequence binding through a self-processing assembly mechanism, has programmability, high sensitivity and specificity, and has important application value in cancer biomarker diagnosis.

The invention discloses a piezoelectric catalyst, a preparation method, application of the piezoelectric catalyst in sewage treatment and a professional application system.The Bi4Ti3O12 piezoelectric catalyst loaded with cation Ti vacancies is prepared through Bi (NO3) 3.5 H2O and Ti (OC4H9) 4 and applied to a special sewage treatment system, a light-pressure catalytic circulation system capable of operating cooperatively and independently is constructed, and the piezoelectric catalyst is applied to the sewage treatment system. And all-weather operation capability is realized. The optical unit and the piezoelectric unit of the special system are independent in structure, functional coupling is achieved through H2O2 directional transmission, and the carrier separation and migration process is optimized step by step. And the problems that the catalyst is difficult to recover and the hydrodynamic response is weak are solved. According to the invention, solar energy and water flow mechanical energy are utilized to realize high-efficiency low-carbon treatment from in-situ oxidant generation, instantaneous activation and deep mineralization, and a stable and economic solution is provided for treatment of refractory organic pollutants.

The invention discloses a non-activated olefin transfer hydrogenation method driven by a light / cobalt / mercaptan triple catalytic system. Olefin compounds and derivatives thereof are used as raw materials, bio-based gamma-terpinene is used as a hydrogen source, and catalytic circulation is realized through a hydrogen atom transfer (HAT) relay mechanism under the mild condition of visible light irradiation. The method is characterized in that (1) a dual-function activation mode of gamma-terpinene is created for the first time, wherein weak bonding diallyl C-H bonds (BDE = 76kcal / mol) synchronously provide hydrogen atoms and aromatization driving force; and (2) a three-catalyst synergistic system: an organic photosensitizer / cobalt-based catalyst / thiol reagent forms a cascade HAT pathway. (3) normal-temperature normal-pressure operation: high-pressure equipment is not needed, and the reaction time is less than 24 hours; the method breaks through the dependence of traditional hydrogenation on precious metal, high-pressure hydrogen and an oxidizing agent, realizes efficient hydrogenation of non-activated olefin, and provides a new way for synthesis of drug molecule intermediates.

The invention provides a formic acid hydrogen production catalyst and a preparation method thereof, the formic acid hydrogen production catalyst takes RuCl3.nH2O as a raw material to prepare an intermediate product [NH4] 2 [RuCl6] crystal, then the intermediate product [NH4] 2 [RuCl6] crystal is coordinated with pyrazine in a nitrogen / argon atmosphere and hydrochloric acid condition, the intermediate product is reduced into a ruthenium (II) neutral complex [Ru ((Pz) 2 (H2O) 4] (tos) 2, and finally the formic acid hydrogen production catalyst with the purity of 95% or more is obtained through separation, washing and drying. The preparation raw materials of the formic acid hydrogen production catalyst are simple and easy to obtain, the production cost is low, the process is simple, waste and residual liquid can be recycled, and large-scale continuous automatic production is easy to realize. When the formic acid hydrogen production catalyst is used for catalyzing formic acid hydrogen production, the catalytic process is easy to control, the hydrogen selectivity reaches 100%, no by-product CO is generated, and the catalytic efficiency is not reduced after five catalytic cycles.

The invention provides a supported hydroformylation catalyst, a preparation method and a method for synthesizing pentacaraldehyde, and relates to the technical field of heterogeneous catalysis of homogeneous catalysts. The structural form of the supported hydroformylation catalyst provided by the invention is Rh (at) P-N / AC, Rh is an active center of the catalyst, and P-N / AC is a carrier; the AC is activated carbon; the structural formula of the P-N organic ligand is shown as a formula I to a formula IV. The supported hydroformylation catalyst provided by the invention can realize catalytic circulation of noble metals and phosphine ligands, and has high activity and C2 selectivity.

The invention discloses a synthesis method of a 2-alkynyl-3-ester pyrrole compound, which comprises the following steps: by taking a pyrrole derivative and (bromoethynyl) triisopropyl silane as raw materials, under the conditions of a silver additive and alkali, catalyzing a pyrrole C2 site direct alkynylation reaction by using a ruthenium catalyst to prepare the 2-alkynyl-3-ester pyrrole compound. The method is based on a precise C-H activation strategy of a ruthenium catalyst, and through reasonable matching of the ruthenium catalyst, a silver salt additive and an alkali system, the activity of a metal center can be effectively regulated and controlled, so that the metal center selectively recognizes a pyrrole C2 site and precise and directional introduction of alkynyl is realized, thereby overcoming challenges such as site competition and catalytic circulation blocking caused by an electronic effect. In a word, the alkynylation system established by the invention is simple and convenient to operate and good in repeatability, provides a reliable technical approach for rapid preparation of the 2-alkynyl-3-ester pyrrole compound, expands a new synthesis thought for construction of drug molecules, functional materials and organic photoelectric structural units, and has important application value and popularization prospect.

The application belongs to the technical field of electrocatalytic hydrogen peroxide production, and particularly relates to a 3D electrocatalytic in-situ hydrogen peroxide generation system and application thereof. The 3D electrocatalytic in-situ hydrogen peroxide generation system comprises a cathode, an anode, an electrolyte and a Co@TriBpy-COF catalyst. The Co@TriBpy-COF catalyst is prepared by the following steps: firstly, synthesizing TriBpy-COF triazine covalent organic framework by a solvothermal method, and then anchoring metal Co by pyridine N to obtain the triazine covalent organic framework anchoring metal Co, i.e. the Co@TriBpy-COF catalyst. The 3D electrocatalytic in-situ hydrogen peroxide generation system promotes the catalytic cycle of Co 2+ → Co 3+ → Co 2+ , greatly improves the hydrogen peroxide yield, so that the catalyst can be reused and the stability of the system is improved.

The invention discloses a high-activity catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: adding 1-vinyl-4-(N-methylene-N, N, N-tripropylamine bromide) benzene and tris (1-methylene-3-vinylpyridine bromide) benzene into a solvent according to a certain proportion for polymerization, and then carrying out ion exchange through anion basic groups containing oxygen and nitrogen elements, so as to obtain the solid alkaline catalytic material disclosed by the invention. An organic matter containing heteroatoms is selected as a monomer, so that the catalytic cycle stability of the catalyst is improved. The high ion loading capacity of the surface of the synthesized solid alkaline catalytic material is utilized, and the heteroatom-containing alkaline anions are combined on the surface of the catalyst through electrostatic interaction to improve the catalytic activity and selectivity of the solid alkaline catalytic material, so that the solid alkaline catalytic material can be efficiently used for catalyzing chlorosilane disproportionation method reaction to prepare high-purity silane.

The invention relates to the technical field of chlorine gas recovery and catalysis, and discloses a chlorine gas recovery and circulation catalysis system for a DCP condensation process, the system comprises a catalysis circulation end, a chlorine gas recovery end, a regeneration control end and a multi-stage alarm module, and a synergistic system of catalysis circulation, chlorine gas recovery and regeneration control is constructed; the cyclic utilization of the immobilized catalyst and the regulation and control of the reaction process are realized; reaction system parameters are monitored in real time, a regeneration program is automatically triggered, the service life of a catalyst is prolonged, meanwhile, an inert gas replacement termination reaction mechanism is adopted, by-product accumulation caused by excessive reaction is prevented, and the purity of a main product and reaction safety are guaranteed; chlorine is captured stage by stage through the multi-stage absorption tower and is directionally converted into chlorinated hydrocarbon by-products, so that the environmental hidden danger of chlorine emission in the traditional process is solved.

The invention belongs to the field of synthetic biology, and discloses an artificial carbon dioxide fixation method and application thereof. According to the method, an artificial carbon dioxide immobilization metabolic pathway is constructed, the pathway is a linear autocatalytic cycle pathway LATCH, acetyl coenzyme A and derivative products thereof can be synthesized by using carbon dioxide or bicarbonate, the catalytic cycle pathway takes two molecules of CO2 or HCO3 <-> as a substrate, one molecule of acetyl coenzyme A is generated through ten enzymatic steps, operation of the pathway depends on ATP and NADPH, and the acetyl coenzyme A can be synthesized by using the linear autocatalytic cycle pathway LATCH. Or is driven by an energy and reducing power supply system, such as organic matters such as glucose, formic acid and the like, high-energy compounds such as polyphosphoric acid, phosphocreatine and the like, or a photoreaction enzyme complex on a plant capsule membrane. An in-vitro multi-enzyme system and recombinant escherichia coli experiment prove that the acetyl coenzyme A and the derivative polyhydroxybutyric acid thereof can be efficiently synthesized, and the application prospect in the fields of carbon neutralization, green manufacturing and the like is wide.

The present disclosure provides autocatalytic cycles and chemical reactor systems in which the autocatalytic cycles may be conducted. Also provided are methods of identifying the autocatalytic cycles and methods of conducting the autocatalytic cycles, e.g., to produce a desired product. Regarding the methods of conducting the autocatalytic cycles, such a method comprises: carrying out a comproportionation reaction by reacting a first reactant M1 and a second reactant M2 to form a product M3, wherein M1, M2, and M3 each comprise at least one chemical element in common and the product M3 is produced in stoichiometric excess; and carrying out an auxiliary reaction by converting the product M3 to M1 or M2.

This invention discloses a polylactic acid (PLA) fiber and its preparation method, relating to the field of PLA fiber technology. The PLA fiber is mainly prepared from the following raw materials in parts by weight: 100 parts PLA, 5-15 parts plasticizer, 0.5-3 parts nucleating agent, 0.5-2 parts anti-hydrolysis agent, 0.05-0.2 parts lubricant, and 0.05-0.1 parts antioxidant. By introducing an anti-hydrolysis agent with a specific structure, and through its synergistic effect with the plasticizer and nucleating agent, the self-catalytic cycle of hydrolysis is effectively blocked, reducing the tendency for molecular chain breakage and performance degradation of the fiber under humid and hot environments. This solves the problems of poor compatibility and insufficient protective effect of anti-hydrolysis agents in existing technologies.

This invention discloses a combined process and system for heavy oil processing. The combined process includes the following steps: In the presence of hydrogen, heavy oil enters a fluidized bed hydrogenation unit. The reaction effluent is separated to obtain a first gaseous stream and a first liquid stream. The first gaseous stream is mixed with hydrogen and enters a first fixed bed hydrogenation reaction unit. The first liquid stream is mixed with hydrogen and enters a second fixed bed hydrogenation reaction unit. The reaction effluent is fractionated to obtain light hydrocarbons, hydrogenated naphtha, hydrogenated diesel, and hydrogenated residue. The hydrogenated residue enters a catalytic cracking unit. The reaction effluent is separated to obtain catalytic liquefied petroleum gas, catalytic naphtha, catalytic diesel, catalytic cycle oil, and catalytic slurry. This process can flexibly produce clean oil products, has a short process flow, a high degree of coupling between units, and low energy consumption and investment.

The invention discloses a copper monatomic catalyst with stable N-heterocyclic carbene as well as a preparation method and application of the copper monatomic catalyst with stable N-heterocyclic carbene. According to the method, construction of a porous organic polymer carrier and anchoring of metal monatomic active sites are innovatively combined, and the copper monatomic catalyst with stable N-heterocyclic carbene is prepared through a one-pot mechanical grinding strategy. A triazine compound, a nitrogen-containing heterocyclic compound, a copper salt and alkali directly react under the assistance of no solvent or a trace amount of solvent, and the catalyst POP-n-NHC-CuX (n = I-IV, X = Cl, Br or I) is obtained through in-situ synchronous synthesis. In the obtained catalyst, copper atoms are stably anchored on a polymer skeleton in a coordination bond form through an NHC ligand to form atomic-scale dispersed active sites. The catalyst can efficiently catalyze the conversion reaction of CO2 and propargyl alcohol and derivatives thereof under mild conditions, is suitable for synthesizing various high value-added chemicals including alpha-alkylene cyclic carbonate, oxazolidinone and beta-oxypropyl carbamate, and shows excellent catalytic cycle stability and substrate universality.

The invention discloses a synthesis method of a benzoquinone compound, which is characterized in that a metal-Schiff base complex and a derivative thereof are used as a catalytic system, oxygen is used as a green oxidant, a polar aprotic solvent is used as a medium, and the efficient synthesis of the benzoquinone compound is realized under the mild condition of 20-90 DEG C. Experiments show that the catalytic system effectively regulates and controls an activation path of a phenolic substrate through a synergistic effect of a ligand electron effect and steric hindrance, so that the conversion rate of an ortho-substituted phenolic compound and the selectivity of a target product are improved. Compared with a traditional system, the catalyst shows excellent catalytic cycle stability and specific recognition capability on o-cresol substrates, and the catalytic efficiency of the catalyst is improved. The technical route has the advantages of high economical efficiency, recyclability and the like, conforms to the green chemistry principle, and provides an innovative solution for industrial preparation of benzoquinone fine chemicals.

An ultrasensitive and long-lasting luminescence cascade can be used for point-of-care detection. A reaction chamber can receive and incubate a volume of a sample and a volume of magnetic tag solution before the combination is washed. Then, a working solution including d-luciferin-6-O-β-d-galactopyranoside (LUGAL), firefly luciferase (Fluc), and a luminescence buffer comprising ATP can be added to the reaction chamber. When the reaction chamber also includes tagged target components including beta galactosidase (GAL) then the GAL supplies luciferin intermediates that catalyze the cleavage of a protecting group from the LUGAL, generating luciferin, and the Fluc catalyzes the oxidation of D-luciferin in a presence of the ATP and O2, yielding oxyluciferin and luminescence. Repeated catalytic cycles increase a measurable signal of the luminescence. An optical sensor can capture an image of the luminescence and the presence of tagged target components can be determined based on an amount of luminescence in the image.

The invention provides a flow confinement RBC-ESDR probe and an application of the flow confinement RBC-ESDR probe in microRNA detection, and belongs to the technical field of biological diagnosis. The RBC-ESDR probe group comprises a substrate probe, a fuel probe and an erythrocyte membrane, the substrate probe is double-stranded DNA formed by assembling an S1 chain, an S2 chain, an S3 chain and a DNA connecting chain 1, and is used for carrying out strand displacement reaction with target miRNA; the fuel probe is double-stranded DNA assembled by a Fuel chain and a DNA connecting chain 2, and is used for releasing target miRNA to enter the next catalytic cycle, so that a signal amplification function is realized; the substrate probe and the fuel probe are anchored on an erythrocyte membrane. According to the invention, the erythrocyte membrane which is simple to prepare is used as a carrier, an integrated RBC-ESDR system which is convenient and efficient to load and is capable of adjusting the proportion of the probe is designed, and the local concentration of the probe and the collision efficiency between the probes are improved, the reaction kinetics is accelerated, and the reaction efficiency is improved by utilizing the space confinement effect and the mobility of the membrane of the integrated RBC-ESDR system.

This invention relates to a method for synthesizing phenylhydrazine hydrochloride, belonging to the field of pharmaceutical synthesis technology. Using palladium chloride as a catalyst and sodium ethoxide as a basic agent, under conditions of 50-55°C, an oxidative addition reaction first occurs with the bromine atom on a haloaromatic compound with a bromine atom at the para position, increasing the oxidation state of palladium and forming a highly reactive palladium intermediate. Sodium ethoxide neutralizes the generated hydrogen bromide, driving the reaction forward. The lone pair electrons on the nitrogen atom in hydrazine hydrate attack the palladium intermediate, undergoing a nucleophilic substitution reaction, attaching the nitrogen atom to the carbon atom bonded to the bromine atom. The palladium intermediate then undergoes a reduction reaction, restoring the oxidation state of palladium and generating phenylhydrazine compounds. Simultaneously, palladium chloride is regenerated and can continue to participate in the catalytic cycle. Ethanol serves as the reaction solvent, providing a homogeneous environment for the reaction. Hydrochloric acid is then added to the reaction system, where hydrogen ions combine with the nitrogen atom in the phenylhydrazine molecule to form a stable salt.

The invention relates to a method for synthesizing DMSO (Dimethylsulfoxide) through electrooxidation of DMS (Dimethylsulfoxide), and belongs to the technical field of electrochemical synthesis. The method comprises the following steps: forming a two-phase electrolyte system by an organic solvent such as methylbenzene and dichloromethane and an acid aqueous solution such as sulfuric acid and methanesulfonic acid; pretreating the electrode; in a diaphragm-free electrolytic cell at the temperature of 5-35 DEG C, dimethyl sulfide, a cerium salt catalyst and a heteropolyacid cocatalyst are added into an electrolyte, and constant-current electrolytic oxidation is carried out at the current density of 50-500 mA / cm < 2 >; and separating liquid after reaction, drying an organic phase, recovering the solvent by atmospheric distillation, and collecting specific fractions by reduced pressure distillation to obtain the product. The reaction can be completed within 2-5 h, and the yield of dimethyl sulfoxide reaches 99.2%. According to the invention, Ce < 3 + > / Ce < 4 + > and heteropoly acid are driven by electric energy to form catalytic circulation, so that traditional hazardous oxidants such as nitric acid are completely abandoned, and NOx pollution is completely eradicated from the source. The method disclosed by the invention is simple and convenient to operate, mild in reaction condition, recyclable in electrolyte, high in selectivity and product yield and remarkable in industrial application potential.

The invention discloses a system and a method for extracting helium from natural gas at normal temperature. The system comprises a first membrane separation unit, a second membrane separation unit, a catalytic circulation dehydrogenation unit, an isobaric drying unit, a first pressure swing adsorption unit, a second pressure swing adsorption unit and a purification unit which are sequentially connected, and the performance of the first membrane separation unit is superior to that of the second membrane separation unit. Aiming at the problems of relatively complicated process flow, more power equipment, high operation energy consumption and high comprehensive cost of helium extraction when a traditional helium extraction technology is adopted for low-grade helium-poor natural gas, the application only adopts relatively simple process integration technologies such as two-stage membrane separation, catalytic circulating dehydrogenation, isobaric drying, two-stage pressure swing adsorption separation and purification and the like; helium is extracted from natural gas with high efficiency and low cost, and a high-purity helium product is prepared.

The utility model discloses a steam generator of a hydrogen molecule reversible catalysis circulating system, which comprises a steam generating tank, heating medium interfaces are arranged at two ends of the steam generating tank, a heating pipeline is arranged in the steam generating tank, the end of the heating pipeline is communicated with the heating medium interfaces, and the heating medium interfaces are communicated with the steam generating tank. A steam outlet is formed in the steam generating tank, and the two water supplementing connectors are symmetrically arranged on the two sides of the top of the steam generating tank. Water is preheated through the water supplementing pipeline assembly and then evenly injected into the steam generation tank, the situation that due to the fact that cold water is directly added into the steam generation tank, instant temperature difference changes of devices in the steam generator cause faults is avoided, the steam generation tank is protected, meanwhile, water is evenly supplemented into the steam generation tank, and the steam generation efficiency is improved. And the uniformity of the temperature in the steam generation tank is ensured.