30results about How to "Catalytic reaction time is short" patented technology

The invention discloses a method for synthesizing betulic acid by carrying out biocatalysis on betulin, comprising the following steps: (1) preparing armillaria luteo-uirens ZJUQH wet cells; (2) adding armillaria luteo-uirens ZJUQH wet cells into ionic liquid or a two-phase system for pre-culture to obtain a pre-culture system; (3) adding betulin solution in the pre-culture system for fermentation culture for 6-24 hours at 25-30 DEG C to obtain transformed culture solution; (4) processing the transformed culture solution to obtain betulic acid. The two-phase system is mixed solvent of ionic liquid and normal hexane, or mixed solvent of ionic liquid and phosphoric acid buffer solution. Compared with a conventional method, the inventive method has higher product yield, shorter catalytic reaction time, simple product separation, lower volatility of ionic liquid system, better biocompatibility and no pollution to the environment.

The invention relates to a synthetic method of vitamin A palmitate. The vitamin A palmitate is synthesized through a chemical enzyme technology, and the method mainly comprises the following steps: 1, hydrolyzing vitamin A acetate by using an alkali solution with an organic solvent as a cosolvent to generate vitamin A alcohol; and 2, extracting the vitamin A alcohol by using an organic solvent, washing the obtained extract liquid with water to remove the cosolvent reacting with palmitic acid, and reacting the vitamin A alcohol with the palmitic acid in a non-aqueous system under the catalysis of immobilized lipase to generate the vitamin A palmitate. The synthetic method provided by the invention adopts the vitamin A alcohol to substitute vitamin A acetate as a substrate in the biological catalysis process, and the vitamin A palmitate to be synthesized through esterification, so the substrate concentration is improved, the conversion rate is high, the reaction time is shortened, the molar ratio of the substrate is reduced, the service life of the immobilized lipase is prolonged, the cost is reduced, industrial production requirements are met, and the gap in the enzyme production of the vitamin A palmitate in the current market is filled.

The invention discloses a method for synthesizing betulic acid by carrying out biocatalysis on betulin, comprising the following steps: (1) preparing armillaria luteo-uirens ZJUQH wet cells; (2) adding armillaria luteo-uirens ZJUQH wet cells into ionic liquid or a two-phase system for pre-culture to obtain a pre-culture system; (3) adding betulin solution in the pre-culture system for fermentation culture for 6-24 hours at 25-30 DEG C to obtain transformed culture solution; (4) processing the transformed culture solution to obtain betulic acid. The two-phase system is mixed solvent of ionic liquid and normal hexane, or mixed solvent of ionic liquid and phosphoric acid buffer solution. Compared with a conventional method, the inventive method has higher product yield, shorter catalytic reaction time, simple product separation, lower volatility of ionic liquid system, better biocompatibility and no pollution to the environment.

The invention discloses a solid acid catalyst and a preparation method and application thereof in esterification transesterification. The preparation method of the solid acid catalyst comprises the following steps of carrying out a liquid phase deposition reaction on a graphene oxide suspension dissolved with an aluminum salt to obtain aluminum oxide modified graphene oxide, and carrying out a mixed reaction on the aluminum oxide modified graphene oxide and concentrated sulfuric acid to obtain the solid acid catalyst. The preparation method is simple to operate, the method has the advantages of simple operation, mild conditions, very good catalysis effect on esterification and transesterification of the kitchen waste oil, realization of the fatty acid methyl ester yield higher than 90%, easy separation of the solid acid catalyst from the product, cyclic utilization after simple treatment, no pollution, and substantial reduction of the production cost of biodiesel prepared from the kitchen waste oil.

The invention provides a 3:1 type Mg / Li bimetallic catalyst, a preparation method therefor and an application of the 3:1 type Mg / Li bimetallic catalyst. The preparation method for the catalyst comprises the steps: (1) preparing an N,N,O-trident alkamine ligand; and (2) under the conditions of inert gas protection and ice water bath, dropwise adding a 1.5-times amount of n-butyl lithium into an ether solution of alkamine, dropwise adding a 0.5-time amount of dibutyl magnesium into the obtained reaction solution, then, dripping a 0.5-time amount of aqueous ether solution, carrying out filtrating after the reaction is completed, and carrying out vacuum concentration on the filtrate, so as to separate out colorless transparent crystals. The preparation method for the catalyst is simple and convenient and is low in condition requirements, non-transition metals, i.e. lithium and magnesium which are cheap and are low in toxicity are used as catalytic active metals, an Meerwein-Ponndorf-Verley (MPV) reaction for preparing corresponding first-level and second-level alcoholic compounds through reducing different types of aldehyde and ketone compounds has relatively high selectivity and catalytic activity, and the catalytic reaction is short in time and high in yield, so that the catalyst has a very good industrial application prospect.

The invention belongs to the field of solid catalysts, and provides a one-step synthesized composite acid solid catalyst PVP-HNTs@UiO-66-SO3H, a preparation method thereof and an application of the catalyst. The preparation method includes steps of dissolving modified HNTs, zircon salt and 2-sulfo terephthalic acid in weakly acidic solution, uniformly dispersing obtained mixed solution under ultrasonic conditions and placing the mixed solution into a reactor for reaction; filtering, collecting and washing reacted products; soaking the washed products in low boiling point solvents, filtering the washed products and then performing vacuum drying to obtain PVP-HNTs@UiO-66-SO3H materials. The PVP-HNTs@UiO-66-SO3H has a porous structure, a large specific surface area and high heat stability, adsorption of fructose molecules is effectively promoted, and the efficiency of preparing HMF (hydroxymethyl furfural) by fructose dehydration is improved.

The invention belongs to the technical field of preparation of sorbic acid, and particularly relates to a method for preparing sorbic acid through photo-efficient catalytic isomerization, and the method comprises the following steps: (1) putting sorbic acid polyester into a reaction kettle, adding deionized water, turning on a light source, putting a solid base catalyst, stirring and heating to react; (2) after the reaction is finished, filtering while hot to obtain a sorbic acid aqueous solution; (3) cooling, crystallizing, washing and drying to obtain the sorbic acid, wherein the solid basecatalyst is supported anion exchange resin, macroporous anion resin is taken as a carrier, EDTA (Ethylene Diamine Tetraacetic Acid) is taken as a complexing medium, palladium, platinum, zinc or copperions are supported, and the loading capacity is 0.1-1wt%. According to the method, the photocatalysis technology is simple and convenient to operate and environmentally friendly, the adopted supported ion exchange resin is high in alkalinity and short in catalytic reaction time, the production efficiency is improved, meanwhile, the supported metal ions and a light source have a synergistic promotion effect on isomerization, and the amount of byproduct tar can be further reduced.

The invention discloses a double-lipase cell surface co-display engineering bacterium, and a construction method and application thereof. The engineering bacterium is co-displayed on the Pichia pastoris cell surface by using Saccharomyces cerevisiae cell wall protein Sed1p as ankyrin and Rhizopus oryzae lipase and Candida antarctica lipase B as double-lipase target proteins, thereby constructing the double-lipase cell surface co-display recombinant yeast engineering bacterium. The Rhizopus oryzae lipase and Candida antarctica lipase B are co-displayed on the Pichia pastoris cell wall surface to prepare the Rhizopus oryzae lipase / Candida antarctica lipase B cell surface co-display complete cell catalyst. The maximum enzyme activity of the surface co-display complete cell catalyst is 686U / g-cell dry weight, which is respectively 3 times or 2 times of the enzyme activity of the independently displayed Rhizopus oryzae lipase or Candida antarctica lipase B; and the methyl ester yield of the catalytic grease esterification reaction is up to 96%.

The invention relates to a preparation method of (S)-(+)-3,4,8,8a-tetrahydro-8a-methyl-1,6-(2H,7H)-naphthoquinone. According to the preparation method, an L-proline derivative is used as a chiral catalyst and microwave radiation is introduced into chiral preparation of the (S)-(+)-3,4,8,8a-tetrahydro-8a-methyl-1,6-(2H,7H)-naphthoquinone for the first time through asymmetric Robinson cyclization reaction under conventional conditions or microwave irradiation conditions. Under proper power, an L-prolinamide type catalyst can keep excellent catalysis performance and the catalysis reaction time isshortened; compared with room-temperature stirring conditions, the synthesis efficiency is greatly improved. The molecular collision is aggravated through the microwave radiation and an intermediatecan more easily pass through an energy barrier to form a transition state, so that the reaction time is remarkably shortened, the preparation efficiency of the (S)-(+)-3,4,8,8a-tetrahydro-8a-methyl-1,6-(2H,7H)-naphthoquinone is greatly improved and the synthesis period is shortened. The method is low in cost, simple and rapid, high in yield and good in stereoselectivity.

The invention discloses an electrochemical reinforced zero-valent iron waste water pretreatment system, which comprises a waste water collecting pool (1), a lifting pump (2), a reinforced zero-valentiron treatment system (3) and a direct current voltage stabilizing power supply system (4), wherein the reinforced zero-valent iron treatment system (3) consists of a plurality of tubular electric reinforced zero-valent iron reaction posts (5) which are connected in series or in parallel. The invention also discloses a pretreatment method. Waste water in the waste water collecting pool (1) is pumped into the reinforced zero-valent iron treatment system (3); the direct current voltage stabilizing power supply system (4) provides loaded voltage and current for the reinforced zero-valent iron treatment system (3); under the condition of the additionally added direct current electricity, the weak electric field is formed in the tubular electric reinforced zero-valent iron reaction posts (5) soas to promote the accelerated catalysis reduction of difficult-to-degrade organic matter in the waste water by active zero-valent iron particles (510); the toxicity of the waste water is obviously reduced or the biodegradability of the waste water is improved; the discharged water enters the subsequent process to be further treated.

The invention discloses a method for directly synthesizing aniline from benzene and ammonia by one step, which takes benzene as a raw material, ammonia as an aminating agent, hydrogen peroxide as an oxidizer, acetonitrile as a solvent and TS-1 loaded by metal as a catalyst. The method for synthesizing aniline by one step has the characteristics of high yield of aniline, mild reaction condition, simple catalyst preparing process and easily obtained cheap raw materials, thus being a green synthesis method which has low cost and high yield and is simple and practicable.

The invention relates to a magnetic pentacoordinate mononuclear cobalt complex, and a synthesis method and application thereof, belonging to the technical field of catalyst preparation. The inventionaims to solve the technical problems of complex structure, difficulty in preparation, low activity, large consumption and long reaction time of conventional catalysts. According to a technical schemein the invention, the method comprises the following synthesis steps of: under the protection of inert gas, subjecting an ether solution of tetramethylethylenediamine to lithiation by n-butyllithium and then to addition with cyclohexanone, slowly adding anhydrous cobalt chloride an acetone bath after a stirring reaction for 1-2 hours, performing stirring at room temperature for 2-4 hours, subjecting a filtrate to vacuum concentration after the reaction is completed, and allowing purple transparent crystals to be precipitated so as to obtain the magnetic pentacoordinate mononuclear cobalt complex. The synthesized complex is prepared by adopting a one-pot method; preparation process is simple; raw materials are easy to obtain; the reaction conditions are mild; and the complex used as a catalyst has high selectivity for MPV reactions of aldehyde and ketone compounds, and can be used for efficiently synthesizing corresponding alcohol compounds.

The invention relates to a nitrogen and oxygen ion containing lithium and magnesium bimetallic catalyst and a preparation method thereof and application thereof and belongs to the technical field of bimetallic catalysts. According to the nitrogen and oxygen ion containing lithium and magnesium bimetallic catalyst, technical problems, in an existing catalyst used in the MPV reaction, that the structure is complicated, the preparation is uneasy, the catalyst activity is not high enough, the usage is large and the reaction time is long are mainly solved. According to the technical scheme, the preparation method of the nitrogen and oxygen ion containing lithium and magnesium bimetallic catalyst comprises the following steps of 1) preparing a N, N, O-tridentate alkamine ligand: preparing the N,N, O-tridentate alkamine ligand according to the prior art; and 2) preparing the nitrogen and oxygen ion containing lithium and magnesium bimetallic catalyst: under the atmosphere of nitrogen, usingn-butyllithium to to remove hydrogen from the N, N, O-tridentate alkamine ligand in ethyl ether solution at 0 degree centigrade; after the solution recovers to the room temperature, stirring the solution for 1-2 hours; and then slowly dripping 0.5 equivalents of dibutyl magnesium into the solution at 0 degree centigrade; continuing to stir the solution for 4-6 hours; after the reaction is finished, filtering a reaction solution; concentrating a filter liquor in a vacuum state to separate out colorless and transparent crystals, wherein the colorless and transparent crystals are the nitrogen andoxygen ion containing lithium and magnesium bimetallic catalysts.

The invention relates to a bidentate phosphine [2Fe2S] diiron complex as well as a preparation method and application thereof. In a nitrogen atmosphere, a reactant (mu-dmedt) [Fe2(CO)6] and trimethylphosphine PMe3 are mixed, an organic solvent is injected, stirring reaction is performed, then trimethylamine oxide is added, stirring reaction continues to be performed at the same temperature, a reaction product is separated, and the bidentate phosphine chelated [2Fe2S] diiron complex is obtained. According to the method, the bidentate phosphine chelated [2Fe2S] diiron complex (mu-dmedt) [Fe2(CO)6](PMe3)2 is used as a catalyst, acetonitrile is used as a solvent, hydrogen peroxide is used as a hydroxylation reagent, benzene is hydroxylated to prepare phenol by a one-step method, the catalyticyield can reach 18.6%, only the product phenol is obtained, the selectivity is 100%, and no by-product is generated.

The invention discloses a supramolecular polymer as well as a preparation and application method thereof. The supramolecular polymer is characterized by being formed by complexation of 3,3',5,5'-tetramethyl benzidine and Fe<2+> with a Fe-N coordination bond and taking the 3,3',5,5'-tetramethyl benzidine, the Fe<2+> and an anion associated with the Fe<2+> as a repeating unit. The preparation methodcomprises the following steps: the 3,3',5,5'-tetramethyl benzidine and a ferrous salt solid or solution are subjected to ultrasonic vibration in ethanol with a water content of not more than 10% to form the supramolecular polymer. The supramolecular polymer utilizes the Fe<2+> to catalyze peroxide groups to form oxygen molecules, and the oxygen molecules rapidly oxidize the 3,3',5,5'-tetramethylbenzidine, so that a blue-green color is shown. The invention also discloses a method for detecting the peroxide content in grease by utilizing the supramolecular polymer, peroxide values of various edible oil on the market are measured, the reaction is sensitive, and the color rendering gradient is obvious.

The invention relates to the technical field of clean coal utilization, petroleum refining and oil additives and particularly relates to a method for continuously producing polyoxy dimethyl ether. According to the method, methanol and paraformaldehyde are used as raw materials, a compound multifunctional catalyst is adopted at a catalyst, and polyoxy dimethyl ether is produced continuously on a liquid fixed bed. The method comprises the step that methanol, methylal or a methanol-methylal mixture catalytically reacts with formaldehyde, metaformaldehyde, dimethyl ether or a formaldehyde-metaformaldehyde-dimethyl ether mixture in an acidic liquid fixed bed reactor at 100-150DEG C under 0.01-0.15MPa under the action of the compound multifunctional catalyst. The invention invents and prepares the multifunctional catalyst, invents and creates the high-efficiency liquid fixed bed reactor which is simple in structure, easy to control and high in through-put capacity, innovates an extreme synthesis way of using the catalyst excessively, and adopts ultrasonic and membrane technologies in final refining so as to explore a new way to remove residual waste acid from liquid material except by hydrogenization and an anion-cation bed, thus forming a complete set of technology for continuously and efficiently preparing polyoxy dimethyl ether from methanol or methylal and formaldehyde, trioxymethylene or paraformaldehyde.

The invention provides a method for crosslinking modification of microfiber collagen by multistep continuous enzyme catalysis, comprising the following steps: dispersing a microfiber collagen raw material in deionized water to prepare mixed liquor, weighing transglutaminase, adding the transglutaminase into the mixed liquor and carrying out a catalytic reaction for 0.5-3 h, weighing enzyme A and adding the enzyme A into the mixed liquor to continue the catalytic reaction for 0.5-2 h, and finally centrifuging the mixed liquor to obtain a precipitate and postprocessing the obtained precipitate to obtain cross-linked modified microfiber collagen. By the method, the microfiber collagen is cross-linked in a short time through multistep enzyme catalysis. Thereby, modified microfiber collagen with improved mechanical properties, heat stability and enzymolysis resistance is prepared, and the product has a biological activity and is safe and non-toxic.

The invention relates to a photocatalysis and biological treatment combined drinking water treatment method. The invention relates to a water treatment method. The invention solves the problems that a photocatalysis water treatment method has high cost, difficult degradation, low efficiency of biological organic matter degradation and bad effects of removing ammonia nitrogen; and the microbe content in the water treated by a biological method is incapable of reaching standards. The method comprises the following steps: 1, introducing raw water into a photocatalytic reactor for carrying out a photocatalytic reaction; 2, carrying out the biological treatment of the water processed in step 1; and returning the outputted water after the biological treatment to the photocatalytic reactor for sterilization, and realizing the treatment of the raw water. The water treatment technology combining the photocatalysis and biological treatment has low cost and high water treatment efficiency. The microbe content in the treated water meets the drinking water sanitary standards. The method is suitable for the treatment of drinking water.

The invention discloses a supramolecular polymer as well as a preparation and application method thereof. The supramolecular polymer is characterized by being formed by complexation of 3,3',5,5'-tetramethyl benzidine and Fe<2+> with a Fe-N coordination bond and taking the 3,3',5,5'-tetramethyl benzidine, the Fe<2+> and an anion associated with the Fe<2+> as a repeating unit. The preparation methodcomprises the following steps: the 3,3',5,5'-tetramethyl benzidine and a ferrous salt solid or solution are subjected to ultrasonic vibration in ethanol with a water content of not more than 10% to form the supramolecular polymer. The supramolecular polymer utilizes the Fe<2+> to catalyze peroxide groups to form oxygen molecules, and the oxygen molecules rapidly oxidize the 3,3',5,5'-tetramethylbenzidine, so that a blue-green color is shown. The invention also discloses a method for detecting the peroxide content in grease by utilizing the supramolecular polymer, peroxide values of various edible oil on the market are measured, the reaction is sensitive, and the color rendering gradient is obvious.

The invention provides a catalyst for catalyzing conversion of silicon tetrachloride and a preparation method thereof, the catalyst has a core-shell structure, the core comprises a catalyst carrier, and the shell comprises an active component; wherein the active component comprises a silicon-copper multi-component alloy, elemental copper and nano ceramic, and the silicon-copper multi-component alloy comprises silicon, copper, transition metal elements and / or rare earth elements. The catalyst disclosed by the invention is applied to a cold hydrogenation reaction process, silicon tetrachloride directly reacts with an active component silicon-copper phase and elemental copper in the catalyst, so that the catalytic reaction time is greatly shortened, and the catalytic reaction rate and the conversion rate can be effectively improved; the catalyst prepared by the preparation method of mechanical alloying has the advantages of abundant pore diameters, fine crystal grains and high defect density.

The invention provides a copper-silicon catalyst and a preparation method thereof. The copper-silicon catalyst comprises a carrier and an active component, wherein the active component is a silicon-copper multi-component alloy, the silicon-copper multi-component alloy comprises a Cu element, a Si element and an M element, and the M element is at least one of Cr, Ni, Mo, Ti, Zr, Ce, La and Sc. The active components of the copper-silicon catalyst are fine in crystal grain, so that the interface defect active center and the silicon-copper phase interface are effectively increased. The catalyst is applied to a cold hydrogenation reaction process, and silicon tetrachloride directly reacts with an active component silicon-copper phase in the catalyst, so that the catalytic reaction time is greatly shortened, and the catalytic reaction rate and the conversion rate can be effectively improved.

The invention relates to a magnetic wheel six-nuclear terbium cluster compound catalyst, a preparation method and application thereof, belongs to the technical field of rare earth complex catalysts, and aims to mainly solve the technical problems of complex structure, difficulty in preparation, low catalyst activity, large dosage and long reaction time of the catalyst used in the existing MPV reaction. According to the technical scheme, the preparation method of the magnetic wheel six-core terbium cluster compound catalyst comprises the following steps: sequentially adding 0.05 mmol of Tb(NO3)3.6H2O, 10 ml of acetonitrile, 0.05 mmol of triethylamine and 0.1 mmol of triethanolamine into a container with a cover, then sealing the container, putting the sealed container into a drying oven at a temperature of 70-80 DEG C to react for 30-36 hours, and after the reaction is finished, taking out the sealed container, standing and cooling to room temperature, and separating out colorless blocky crystals, namely the magnetic wheel hexanuclear terbium cluster compound catalyst.

The invention provides a N,N,O-trident Mg / Li double metal catalyst and a preparation method and an application thereof. The preparation method comprises the following steps: 1) preparing a N,N,O-trident alkamine ligand; and 2) dropwise adding equal equivalent n-butyllithium into an ether solution of alkamine under inertial gas projection and an ice-water bath, dropwise adding equal equivalent dibutyl magnesium into the reaction solution, after reaction, performing filtration, vacuum concentration on the filtrate, and separating out colorless transparent crystals to obtain the catalyst. The catalyst is simple in preparation method and low in condition demand; cheap non-transitional metals lithium and magnesium which are low in toxicity are metals with catalytic activity, and have relatively high selectivity and catalytic activity for an Meerwein-Ponndorf-Verley (MPV) reaction of preparing corresponding first-level and second-level alcohol compounds by reducing different types of aldehyde and ketone compounds. The catalyst is short in catalytic reaction time and high in yield, and has a very good industrial application prospect.

The invention provides a 3:1 type Mg / Li bimetallic catalyst, a preparation method therefor and an application of the 3:1 type Mg / Li bimetallic catalyst. The preparation method for the catalyst comprises the steps: (1) preparing an N,N,O-trident alkamine ligand; and (2) under the conditions of inert gas protection and ice water bath, dropwise adding a 1.5-times amount of n-butyl lithium into an ether solution of alkamine, dropwise adding a 0.5-time amount of dibutyl magnesium into the obtained reaction solution, then, dripping a 0.5-time amount of aqueous ether solution, carrying out filtrating after the reaction is completed, and carrying out vacuum concentration on the filtrate, so as to separate out colorless transparent crystals. The preparation method for the catalyst is simple and convenient and is low in condition requirements, non-transition metals, i.e. lithium and magnesium which are cheap and are low in toxicity are used as catalytic active metals, an Meerwein-Ponndorf-Verley (MPV) reaction for preparing corresponding first-level and second-level alcoholic compounds through reducing different types of aldehyde and ketone compounds has relatively high selectivity and catalytic activity, and the catalytic reaction is short in time and high in yield, so that the catalyst has a very good industrial application prospect.