100 results about "Iron catalyzed" patented technology

The invention discloses an organic wastewater treatment method based on polyaniline coated nanometer zero-valent iron. The organic wastewater treatment method comprises the following steps: taking the polyaniline coated nanometer zero-valent iron as a catalyst, taking air or oxygen as an oxidizing agent, meanwhile adding a redox mediator, activating oxygen to form active oxygen in situ, and degrading organic pollutants in the water. The polyaniline coated nanometer zero-valent iron is high in catalytic activity, capable of directly utilizing oxygen in air, low in cost, environment-friendly, easy to recycle, and capable of being recycled; the method is simple in equipment, convenient to operate, and capable of efficiently degrading the organic pollutants in the water within a wider pH value range, and has a bright application prospect.

The invention belongs to the technical field of organic synthesis chemistry, and particularly relates to a method for preparing iron-catalyzed pyrrole and pyrrole cyclic compounds. The invention provides a method for preparing FeX3-catalyzed pyrrole and thick pyrrole derivatives. The method comprises synthesis of an omega, gamma-alkynone compound, a cyclization reaction and the like. The method develops the cyclization reaction of the FeX3-catalyzed omega, gamma-alkynone compound and a primary amine compound, and can efficiently prepare high-purity pyrrole and pyrrole cyclic compounds with high yield. Compared with the conventional Pd, Au, Ag and Cu catalysts, the FeX3 has the advantages of environment friendliness and low price. The method has the advantages of simple operation, easily obtained raw materials and reagents, mild condition, environment-friendly catalytic system and easy separation and purification of products, is suitable for synthesizing various substituted pyrrole and pyrrole cyclic compounds, and is particularly suitable for large-scale industrial production.

The invention discloses a method for treating organic wastewater based on polyaniline loaded nanoscale zero-valent iron. The method comprises the following steps: taking polyaniline loaded nanoscale zero-valent iron as a catalyst and air or oxygen as an oxidant, activating oxygen to form active oxygen in situ, and degrading organic pollutants in water. The polyaniline loaded nanoscale zero-valent iron is high in catalytic activity; oxygen in the air can be directly utilized and is low in cost, environment-friendly, easy to recover and reusable; moreover, equipment in the method is simple and convenient to operate, the organic pollutants in the water can be efficiently degraded within a relatively wide pH range, and the method has a very good application prospect.

The invention relates to the technical field of magnesia carbon bricks, and discloses a magnesia carbon brick using phenolic resin added with a catalyst. The magnesia carbon brick comprises the following ingredients: a component A, a component B and a component C, wherein a content ratio of the component A to the component B to the component C is 3: 1: 1; the component A is composed of fused magnesite, flake graphite and a binding agent in a content ratio of 3: 1: 4; the component B is composed of ceramic and ferroferric oxide powder in a content ratio of 3: 1; and the component C is composedof glass fibers and a catalyst in a content ratio of 2: 1. In the magnesia carbon brick using phenolic resin added with the catalyst, the use of the iron-catalyzed phenolic resin promotes the structural rearrangement of the magnesia carbon brick, leads to the formation of nanotubes and more ceramic whiskers, improves the performance of the magnesia carbon brick at high temperature, and obviously enhances the oxidation resistance and mechanical strength of the magnesia carbon brick.

The invention discloses a free radical controllable-release defect coordination metal-organic framework, and a preparation method and an application thereof. The preparation method comprises the following steps: introducing monocarboxylic acid to partially replace a polybasic carboxylic acid organic ligand to participate in synthesis of a skeleton structure when ferrous ions are coordinated with the polybasic carboxylic acid organic ligand, carrying out washing and vacuum thermal activation to remove the monocarboxylic acid in order to obtain a metal-organic framework material with adjustabledefect coordination catalytic activity iron center content, and adjusting the exposure degree of defect coordination active sites to realize controllable release of free radicals during catalytic activation of persulfate. The high-proportion defect coordination metal-organic framework material is prepared by the method, and the content of the defect coordination iron catalytic activity center of the product can be regulated. The synthesized metal-organic framework material can be used for efficiently treating various non-degradation organic wastewater as a catalyst of heterogeneous activated persulfate, and has the advantages of simple synthesis steps, controllable release of free radicals, high catalytic activity, good stability, good recyclability and the like.

The invention belongs to the field of pharmaceutical and natural compound chemical intermediates and related chemical technologies, and relates to a preparation method of an iron-catalyzed phosphazenecompound. The preparation method comprises the steps that organphosphorus and 3-substituted-1,4,2-dioxazole-5-ketone serve as raw materials, cheap metal iron serves as a catalyst, and the phosphazenecompound is constructed through one step under the light condition, wherein the molar concentration of a 3-substituted-1,4,2-dioxazole-5-ketone compound in a solvent is 0.01-2 mmol/mL, and the molarratio of the 3-substituted-1,4,2-dioxazole-5-ketone compound to the adopted catalyst is (1:0.01) to (1:0.5). The preparation method has the beneficial effects that a light-catalyzed reaction is adopted, the clean and pollution-free effects are achieved, the reaction condition is mild, operation and aftertreatment are easy, and substrate compatibility is good.

The invention discloses a ferronickel catalytic material and a preparation method thereof, and application of a ferronickel catalytic material in preparing hydrogen by electrolyzing water and preparation of liquid solar fuel. The material is prepared on a modified nickel substrate under mild conditions by using soluble iron salt as a raw material, and the ferronickel catalytic material which can be applied to the harsh conditions of industrial alkaline electrolyzed water is successfully prepared. The ferronickel catalytic material includes a nickel metal substrate and a catalytically active layer containing an iron element and a nickel element. The ferronickel catalyst is adopted to promote the water decomposition reaction, and the energy consumption required by preparing hydrogen per cubic meter by industrial alkaline electrolyzed water can be reduced from 4.4 kilowatt-hour to 4.01 kilowatt-hour, so that the conversion amount of solar energy to methanol is improved by 9.7 percent. Theferronickel catalytic material has the advantages of a simple preparation process, the low cost and easy implementation of industrial requirement amplification preparation. The process can convert solar energy into conventional fuel which is convenient to store and transport, provides a new way for solving the energy problem and the environmental problem, and has great economic benefit and socialbenefit.

The invention provides a green method for preparation of aldehyde or ketone by iron catalyzed alcohol oxidation. The method adopts a common iron salt as the catalyst, uses an oxynitride as the cocatalyst, can realize oxidation of various alcohols in a non-halogen solvent and under open air room temperature conditions, and especially can achieve oxidation of high selectivity non-active fatty primary alcohol. The catalytic system uses a cheap and easily available, non-toxic and high activity iron catalyst system, and uses economical, safe and green air as the oxidant. The reaction temperature can be set at room temperature condition. The catalytic system has few components, and additional adding of a ligand or alkali compound is unnecessary. The reaction is easy in operation, and especially can realize oxidation of non-active fatty primary alcohol into aldehyde or ketone efficiently. The method provided by the invention has very mild requirements for reaction conditions, and has good research and industrial application prospects.

The invention discloses hydrophobic double MOF-based porous carbon material preparation. A method comprises the following steps that an MOF-5 material and another iron-based MOF material are subjectedto high-temperature carbonization after being evenly mixed according to a certain ratio, so that a hydrophobic porous carbon material is obtained. The method is simple in preparation process, the product has a larger specific surface area and abundant pore channels, and meanwhile, through an iron catalysis graphite method, the graphitization degree of the porous carbon material is improved, so that the hydrophobicity of the porous carbon material is improved, and the porous carbon material has better application prospects in the aspect of adsorption separation.

The invention relates to a pyridine tertiary amine iron complex and a preparation method thereof, and a method for catalyzing polymerization of conjugated diene by using the pyridine tertiary amine iron complex, belonging to the field of catalytic polymerization of conjugated diene. The invention aims to solve the technical problem that the activity and selectivity of the catalyst are reduced since the structures of existing pyridine imine or pyridine amine iron catalysts are easily changed under the influence of cocatalysts and the technical problem that the heat resistance of conventional iron-based catalysts. The pyridine tertiary amine iron complex disclosed by the invention is obtained by mixing and reacting a pyridine tertiary amine ligand and anhydrous FeCl2. An iron catalytic system of the invention is a pyridine tertiary amine iron complex with a clear molecular structure; and the complex is simple in preparation, easy to obtain, low in cost, mainly used for catalyzing polymerization of conjugated olefin, and free of the possibility that a ligand skeleton reacts with a cocatalyst compared with conventional pyridine tertiary amine iron catalysts.

The invention discloses a method for preparing benzil by iron-catalyzed air oxidation of benzoin. The method comprises the following steps: taking acidified dimethyl sulfoxide (DMSO) as a solvent, adopting iron salt containing iron ions as a catalyst under the heating condition and oxidizing the benzoin under the action of an oxidant to prepare benzyl; the reaction temperature under the heating condition is 40-80 DEG C; the oxidant comprises atmospheric air, high oxygenated air and oxygen. The method disclosed by the invention is mild in reaction condition, green and clean, and a product solvent is easy to separate.

The invention provides coconut shell-based mesoporous activated carbon, and a preparation method and application thereof. The preparation method comprises the following steps: (1) grinding and sieving a coconut shell carbonized material to obtain 20-60-mesh coconut shell carbonized material particles; (2) dissolving ferric salt, adding the coconut shell carbonized material particles obtained in the step (1), and stirring and dipping to obtain a dipped ferric salt carbonized material; and (3) activating the ferric salt-impregnated carbonized material obtained in the step (2), and pickling to obtain the coconut shell-based mesoporous activated carbon. According to the invention, the coconut shell carbonized material is used as a raw material, through a carbon thermal reduction coupling catalytic activation method, the purposes of one-step pore-forming and pore-expanding are realized by using nano zero-valent iron formed by carbon thermal reduction to catalyze the gasification reaction of carbon and carbon dioxide, and the prepared activated carbon has the advantages of large specific surface area, developed pore structure, high mesopore rate and wide pore size distribution range.

Disclosed is a process for preparing a compound of formula A-N═C(D)(B), from a compound of formula A-N═C(E)(B) and a compound of formula D-M using an iron catalyst, where the process has is represented by Equation (I)

The invention relates to an efficient preparation method of high molecular weight polymyrcene with high 1,4-structure content, and belongs to the field of iron catalyzed myrcene polymerization. In order to solve the problems of low activity, large catalyst dosage, high polymerization cost and the like of the existing high 1,4-polymyrcene catalytic technology, the invention provides an efficient and cheap method for preparing high-molecular-weight polymyrcene with high 1,4-structure content. The method comprises the following steps: adding a solvent, a main catalyst, a cocatalyst and myrcene monomers into a reactor in any sequence under the protection of inert gas, carrying out polymerization reaction while stirring, adding a quenching agent and an anti-aging agent, carrying out quenching reaction, repeatedly washing with ethanol, and carrying out vacuum drying to obtain polymyrcene; the number-average molecular weight of the obtained polymyrcene ranges from 2.0*10<5> g/mol to 1.7*10<6>g/mol, the molecular weight distribution ranges from 1.5 to 5.5, the molar content of the 1,4-polymyrcene ranges from 50% to 70%, and the molar content of the 3,4-polymyrcene ranges from 30% to 50%.The method is high in catalytic activity and suitable for industrial production.

A modified kraft pulp fiber with unique properties is provided. The modified fiber can be a modified bleached kraft fiber that is almost indistinguishable from its conventional counterpart, except that it has a low degree of polymerization (DP). Methods for making the modified fiber and products made from it are also provided. The method can be a one step acidic, iron catalyzed peroxide treatment process that can be incorporated into a single stage of a multi-stage bleaching process. The products can be chemical cellulose feedstocks, microcrystalline cellulose feedstocks, fluff pulps and products made from them.

The invention relates to a method for preparing aromatic acid through oxidation reaction of 1, 2, 3-grade alkyl substituted aromatic compounds under iron catalysis. The method comprises the following steps: under the action of an iron compound, providing proper temperature and/or light energy, and in the presence of an oxidant and/or an additive, carrying out C-C bond breakage on benzyl positions of aromatic compounds in a solvent to realize selective oxidation so as to obtain a corresponding oxidation compound ketone or acid. According to the invention, C-C bond rupture and oxidation are directly and selectively carried out on the benzyl position of the aromatic compound, so that the method has the advantages of simple reaction, simple operation, mild oxidation condition, high atom economy, high reaction yield, easy separation and purification of the product, suitability for synthesis of benzoic acid derivative compounds, and the like; air can be directly used as an oxidizing agent, so that use of a large amount of heavy metal salt is avoided, and the method is very attractive in industrial production; and the method has very large application potential in the fields of metal catalysis, chemical synthesis and the like by using cheap metal for reaction.

The invention discloses a synthesis method of a natural product (-)-newbolline. With optically-active Boc protected pyrrolidine formamide as a raw material, five chemical conversion processes are successively carried out, namely, a Grignard reaction, a Wittig reaction, a hydroboration-oxidation reaction, a hydroxyl azide reaction and an iron-catalyzed N-N cyclization reaction, so as to realize high-efficiency simple total synthesis of the natural product (-)-newbolline. The synthesis method has the advantages of simple operation, mild reaction conditions, easy post-treatment and high yield ofthe target compound. Compared with a reported synthetic route, the method disclosed by the invention does not need to use highly toxic cuprous cyanide, a large amount of titanium trichloride and a large amount of strong corrosive concentrated hydrochloric acid, and the dosage of the key N-N forming reaction catalyst in the last step only needs 0.02-0.05 chemical equivalent. Therefore, the invention provides an important method for large-scale preparation of the natural product (-)-newbolone.

The invention discloses a method for synthesizing poly-substituted 2-aryl benzothiazoles by utilizing thiourea as a sulphur source. According to the method, thiourea reacts with benzyl chloride to generate an S-benzylisothiourea salt in situ. After that, through the aromatic nucleophilic substitution reaction of the obtained S-benzylisothiourea salt with 2-fluoronitrobenzene and then the one-step reduction (one-pot reaction) process, o-amino phenyl benzyl thioether as an intermediate product can be obtained. Finally, through the iron-catalyzed cross-dehydrogenative-coupling reaction of the o-amino phenyl benzyl thioether, a target product can be obtained. Compared with the traditional synthetic method, the method has the significant advantages of (1) short reaction step, wherein the target product can be synthesized through only three steps of simple reactions by utilizing simple chemical raw materials; (2) mild reaction condition, high atom economy, and relatively safe and cheap reaction reagents; (3) high reaction yield, good substrate tolerance and free of any dangerous or high-toxicity reagent. Therefore, the method might be applied to the large-scale production.

The invention discloses a method for synthesizing pyrroline compounds through iron-catalyzed amino alcohol and enol. In the atmosphere of inert gas, the amino alcohol and the enol serve as raw materials, potassium tert-butoxide is used as alkali, a series of pyrroline compounds are synthesized through the dehydrogenation coupling of low-cost transitional metal iron-catalyzed amino alcohol and theenol and the fracture of carbon-carbon bonds, the system is simple, the operation is simple and convenient, the reaction conditions are mild, and the reaction substrate has good applicability.

The invention discloses a method for preparing an aryl ketone derivative based on a free radical-free radical cross-coupling reaction such as ketonic acid decarboxylation and fatty aldehyde de-carbonylation. The method comprises the following steps: reacting aryl-substituted ketonic acid with fatty aldehyde under the catalytic action of ferric triacetylacetonate to generate an aryl ketone derivative; the gram-grade reaction can be realized by the method only by using 3mol% of an iron catalyst; and the method has the advantages of no need of consumption of a large amount of a Lewis acid catalyst or a stoichiometric organic metal reagent, mild reaction conditions, one-step reaction, few by-products, wide substrate application range and scalable reaction, and overcomes the defects of large catalyst consumption, insufficient functional group tolerance, many by-products and the like in the prior art.

The invention relates to an efficient preparation method of high molecular weight polymyrcene with high 3, 4-structure content, which belongs to the field of iron catalyzed myrcene polymerization. Inorder to solve the technical problems of low catalytic activity, large catalyst dosage and high polymerization cost in the existing technology for preparing polymyrcene with high 3, 4-structure content, the invention provides an efficient and cheap method for preparing high molecular weight polymyrcene with high 3, 4-structure content. The method comprises the following steps of adding a solvent,a main catalyst, a cocatalyst and myrcene monomers into a reactor in any sequence under the protection of inert gas, carrying out polymerization reaction while stirring, adding a quenching agent and an anti-aging agent, carrying out quenching reaction, repeatedly washing with ethanol, and carrying out vacuum drying to obtain polymyrcene. The number-average molecular weight of the obtained polymyrcene ranges from 2.0*10<5> g/mol to 1.4*10<6> g/mol, the molecular weight distribution ranges from 1.5 to 5.0, the molar content of the 3, 4- polymyrcene ranges from 50% to 70%, and the molar content of the 1, 4-polymyrcene ranges from 30% to 50%.

The invention relates to a (R)-praziquantel intermediate and a preparation method of (R)-praziquantel. The method comprises the following steps: reacting dihydroisoquinoline and nitromethane serving as raw materials in an enclosed grinding tank under the actions of a chiral catalyst, alkali and a grinding aid by taking 1 to 4 stainless steel grinding balls with diameters of 8 to 14 mm as a grinding medium for 20 to 60 minutes, adding chloroacetyl chloride, and continually reacting for 5 to 30 minutes; after the reaction, leaching the mixture with petroleum ether and ethyl acetate, and recrystallizing to obtain the (R)-praziquantel intermediate; catalytically reducing the intermediate with iron to obtain (R)-1-aminomethyl-2-chloroacetyl tetrahydroisoquinoline, and carrying out an amidation-cyclization reaction on the (R)-1-aminomethyl-2-chloroacetyl tetrahydroisoquinoline and cyclohexaformyl chloride in the enclosed grinding tank under the actions of alkali and the grinding aid by taking 1 to 6 stainless steel grinding balls with diameters of 6 to 14 mm as the grinding medium; after the reaction, directly performing column chromatography separation and purification on the mixture toobtain the (R)-praziquantel. The method has the advantages of mild reaction conditions, easiness and convenience in operation, less pollution, high product yield, high enantioselectivity, and betterpopularization and application prospect.

The present invention is iron catalyzed styrene derivative synthesizing process with active arene and alkyne, and belongs to the field of chemical technology. Active arene, alkyne and iron catalyst are mixed in solvent through stirring and reacted, the reacted mixture liquid is filtered, and the filtrate is decompression distilled to eliminate solvent and column chromatographically separated to obtain styrene derivative. The styrene derivative has the structure as shown. The present invention has cheap facile iron catalyst, mild reaction condition, simple operation, environment friendship and high economic performance.