193results about How to "Short reaction process" patented technology

The invention discloses a method for directly reclaiming and preparing superfine nickel powder in positive material of nickel-hydrogen batteries. The method is characterized in that firstly, a professional disassembling machine is adopted to disassemble waste nickel-hydrogen batteries to obtain positive waste material which is crushed; secondly, lixiviating is performed by adopting a sulphuric acid and oxyful system; iron is removed and then impurities are extracted using P204 from lixivium to cause impurities such as calcium, copper, manganese, zincum and the like to transfer to an organic phase and cause nickel and cobalt to be left in a water phase; thirdly, solution containing nickel and cobalt is separated and extracted by using P507 so cause the cobalt to transfer to the organic phase the nickel to be left in the water phase; at last, faffinate containing nickel is deoxidized using hydrazine hydrate to obtain the superfine nickel powder. Through the application of the method, the coefficient of recovery of nickel in the positive waste material can reach more than 98.5 percent, and the purity of the obtained nickel reaches more than 99.7 percent; and the superfine nickel powder with the average grain diameter of 400 nm and face centered cubic crystal type sphericity is obtained by applying the method.

The invention relates to a method for preparing capacitive active carbon powder through a biomaterial treated by fused salt, and belongs to the field of carbon materials. The method comprises the following steps: washing, drying and mincing a waste biomaterial, and preparing the waste biomaterial into a feed material in a definite shape; wrapping the prepared feed material by using a mesh bag made from high-temperature resistant materials or a basket, and fixing on an operating rod made from the high-temperature resistant materials; heating the fused salt to 750-850 DEG C, then immersing the feed material into the fused salt for cracking, and lifting to the upper part of a reactor after 1 hour, and cooling in an inert atmosphere; finally washing a small amount of salt contained in a product by using water so as to prepare active carbon. The method disclosed by the invention can not only be used for recycling the waste biomaterial, but also be used for preparing the active carbon, and changing wastes into valuables.

The invention relates to a manufacturing method of atorvastatin intermediate (R)-(-)-4-nitrile-3-hydroxybutyrate (ATS-5), which solves the problems of high cost, expensive raw material price and the like of the prior art. The manufacturing method is characterized in that the atorvastatin intermediate is prepared from epichlorohydrin as a raw material through ring-opening addition, glycolysis esterification, cyaniding substitution synthesis and refining. The invention has simple synthesis route, abundant raw material resources, low equipment requirements and no high-temperature high-pressure reaction; the content of produced ATS-5 is more than 98 percent, the content of water is lower than 0.2 percent, and the content of enantiomer is less than 1.0 percent. The manufacturing method is a mature production process for manufacturing the intermediate of medicine atorvastatin and is applicable to medium-sized and small enterprises.

A process for preparing trisiloxane containing glucosylamido used as the assistant of agricultural chemical to decrease the surface tension of water includes catalytic reaction between hexamethyl disiloxane and aminosilane to obtain aminotrisiloxane, and reacting on lacton gluconate in methanol.

The invention discloses a polyolefin resin nucleating agent and a preparation method thereof. The nucleating agent is polyol acetal-silica gel graft copolymer shown as a right general formula (I); the nucleating agent improves the stability of organic acetal and environment-friendly performance, reduces the production cost and remarkably improves the mechanical performance and thermal performance of polyolefin resin in particular.

The invention discloses a method for directly recovering and producing electro deposited cobalt from waste lithium ion cells. The method is mainly characterized in that: firstly, the waste lithium ion cells are disassembled and separated to obtain positive plates; secondly, the positive plates are immersed by an organic solvent N-methylformamide (NMP), and aluminum foils and anode materials of a current collector are separated; thirdly, the anode materials which contain lithium cobaltate are leached out by a hydrochloric acid and hydrogen peroxide system, and undissolved substances are filtered and separated; and fourthly, the electro deposited cobalt is obtained after electrodeposition of filtrate. By adoption of the method, the recovery rate of the cobalt in the waste lithium ion cells can be about 97.0 percent, and the purity of the electro deposited cobalt can be more than 99.8 percent.

Provided are an organosilicon surfactant and a thiol-ene click chemistry process preparation method thereof. The organosilicon surfactant is of a structure shown in a formula (I) (shown in the description), wherein the m and the n are integers, the sum of the m and the n is greater than 20 but is smaller than 100, the x is 10-100, the y is 0-80, the x and the y are integers, and the R is C1-10 straight-chain or heterogeneous long-chain alkyl or alkyl phenyl. The preparation method comprises the steps that thiol polyether and vinyl polysiloxane serve as raw materials and are dissolved in a benign solvent, a light initiator is added under stirring for reaction, the reaction materials are subjected to vacuum rotary evaporation at the temperature of 25-45 DEG C to remove the solvent after the reaction is completed, then vacuum drying is performed at the temperature of 30-60 DEG C for 2-48 hour to obtain the organosilicon surfactant having structural characteristics shown in the formula (I). Precious metal catalysts (such as a metal platinum catalyst) used for synthesis of organosilicon surfactants in the prior art are abandoned, and environmental protection and safety and widening of the product application field are guaranteed.

A polyethanediol modified trisiloxane containing glucosylamido used as the assistant of agricultural chemical to decrease the surface tension of water is prepared through catalytic reaction between hexamethyldisiloxane and aminosilane to obtain aminotrisiloxane, reacting on lactone gluconate in methanol to obtain trisiloxane containing glucosylamido, and modifying it by polyethanediol method glicideether.

The invention provides a method of preparing metal titanium powder through TiO2. The method comprises the following steps of: uniformly mixing CaO with Al powder, and preparing the mixture to a block body I; uniformly mixing anhydrous CaCl2 with TiO2, and preparing the mixture to a block body II; putting the two block bodies in the same vacuum furnace, heating to 1000-1300 DEG C at a pressure smaller than 50 Pa, holding for 4-10h, taking out the block body II after the block body II is cooled with the furnace, and breaking and grinding the block body II; leaching out the reducing material through a hydrochloric acid solution; and filtering the lixivium and the solid, repeatedly washing the filter cake through distilled water and absolute ethyl alcohol, and drying the filter cake to obtain the metal titanium powder. The method disclosed by the invention is used for preparing the metal titanium powder by taking aluminum powder, calcium oxide and titanium dioxide as raw materials. The method saves the calcium condensation and remelting gasification processes, shortens the reaction procedures and saves the energy source; the reduction process is easy to control, the operation is simple, and the obtained product titanium powder can achieve the standard of national first class titanium powder; and the method can be used for realizing the mass scale production of the metal titanium powder.

The invention relates to a method for preparing praziquantel, which is characterized by comprising the steps: (1) isoquinolin, sodium cyanide or potassuim cyanide and triethylamine or pyridine are added into a reactor to react, and yellow solid which is a first step product is obtained; (2) the first step product is added into a high-pressure hydrogenation kettle and filled with hydrogen to react under the action of catalyst, so that a second step product is obtained; (3) after being stirred and dissolved, the second step product and ethyl acetate is added with anhydrous potassium carbonate or anhydrous sodium carbonate, and then is stirred at the room temperature and dripped with chloracetyl chloride to be stirred at the room temperature to react, so that the solid obtained in the reaction is crude product of the praziquantel, and fine product is obtained by recrystallization of absolute methanol. Compared with the prior art, the method has the advantages of shortening the reaction process, reducing the energy consumption, improving the overall yield, etc.

The invention discloses a cationic functional fluorine-containing polymer and a preparation method thereof. The functional fluorine-containing polymer is a cationic functional fluorine-containing polymer prepared by the steps of: taking a fluorine-containing monomer, a graftable active monomer and a hydrophilic functional monomer as copolymerization monomers, firstly polymerizing, in a water phase dispersion system, the copolymerization monomers into an active precursor polymer of which the main chain contains an atom transfer free radical polymerization active side group, then initiating a cationic functional monomer by using the active side group on a solid liquid interface to perform interface atom transfer free radical polymerization, and performing polymerization to form the cationic functional fluorine-containing polymer containing a cationic type side chain. The cationic type side chain contains quaternary ammonium salt type and quaternary phosphonium salt type groups, has a very strong charge positive electrical property, and enables the polymer to have very strong antibacterial performance, hydrophilic performance and anion exchange absorbing performance, and the polymer can be applied separately to preparation or together with other resin to blending preparation of a high-hydrophilicity antibacterial separation membrane product, a gel electrolyte, an adhesive, a battery diaphragm, an anion exchange adsorbing material and an antibacterial coating, so that the application range of vinyl chloride type polymers is greatly broadened; and in comparison with an existing material, the polymer is good in hydrophilicity, is antibacterial, and is good in application prospect.

The invention relates to a method for preparing biodiesel by utilizing high-acid value oil. The method comprises the following steps of: esterifying the raw materials of the high-acid value oil, enabling glycerol and the raw materials of the high-acid value oil to esterify with each other under the catalyzing action of an ionic liquid, and thus obtaining a mixture of a low-acid value esterification product-monoglyceride, diglyceride or triglyceride; then carrying out interesterification on the esterified oil, namely carrying out interesterification on the mixture of the low-acid value esterification product-monoglyceride, diglyceride or triglyceride and methanol under the action of a base catalyst, and thus generating crud low-acid value biodiesel fatty acid methyl ester; and vacuum distilling and refining the low-acid value biodiesel fatty acid methyl ester so as to obtain the high-purity low-acid value fatty acid methyl ester biodiesel. The details of the method are described in a specification. The method has the advantages that the method does not need post treatment and is shortened in reaction process, lowered in technological energy consumption and clean in process, equipment corrosion caused by conventional sulfuric acid catalyzing is eliminated, the equipment investment and production cost are lowered, and the yield of a target product-biodiesel (fatty acid methyl ester) is high.

The invention discloses a method and a device for recovering cadmium and nickel from waste nickel cadmium cells and preparing the cadmium and the nickel into metal cadmium ingots and superfine nickel powder. The method is mainly characterized in that: firstly, the waste nickel cadmium cells are simply disassembled; secondly, the waste nickel cadmium cells are placed into a sealed high-temperature furnace, are distilled, condensed and recovered to obtain the metal cadmium ingots; thirdly, residual materials are leached out by a sulfuric acid and hydrogen peroxide system; fourthly, after iron removal for a leaching solution, P507 is used for extracting and separating the nickel and cobalt; and fifthly, hydrazine hydrate is used for reducing nickel raffinate, and the superfine nickel powder is prepared. The method can make the cadmium recovery rate in the waste nickel cadmium cells be more than 99.5 percent, the purity of the metal cadmium ingots be more than 99.9 percent, the recovery rate of the nickel be more than 97.5 percent, and the purity of nickel powder be more than 99.8 percent.

The invention discloses a cationic functional vinyl chloride polymer and a preparation method thereof. The functional vinyl chloride polymer is a cationic functional vinyl chloride polymer prepared by the steps of: taking a chlorine-containing monomer, a graftable active monomer and a hydrophilic functional monomer as copolymerization monomers, firstly polymerizing, in a water phase dispersion system, the copolymerization monomers into an active precursor polymer of which the main chain contains an atom transfer free radical polymerization active side group, then initiating a cationic functional monomer by using the active side group on a solid liquid interface to perform interface atom transfer free radical polymerization, and performing polymerization to form the cationic functional vinyl chloride polymer containing a cationic type side chain. The cationic type side chain contains quaternary ammonium salt type and quaternary phosphonium salt type groups, has a very strong charge positive electrical property, and enables the polymer to have very strong antibacterial performance, hydrophilic performance and anion exchange absorbing performance, and the polymer can be applied separately to preparation or together with other resin to blending preparation of a high-hydrophilicity antibacterial separation membrane product, a battery diaphragm, an anion exchange adsorbing material and an antibacterial coating, so that the application range of vinyl chloride type polymers is greatly broadened; and in comparison with an existing material, the polymer is good in hydrophilicity, is antibacterial, and is good in application prospect.

The invention discloses a method for preparing Dawson heteropolyphosphatotungstate. The method comprises the following steps: (1) enabling a tungstate solution to come into contact with an inorganic acid solution, so as to obtain a reactive intermediate; (2) continuously enabling the solution to come into contact with a phosphoric acid solution, so as to obtain a phosphotungstic acid solution; (3) transferring the phosphotungstic acid solution to a high-pressure reactor, and carrying out high-temperature and high-pressure reaction; (4) adding an inorganic salt precipitant to the obtained phosphotungstic acid solution, carrying out salting-out crystallization to obtain phosphotungstate, filtering, purifying and drying, so as to obtain the Dawson heteropolyphosphatotungstate. Compared with the prior art, the method is simple in technological process, short in reaction cycle, high in yield and product purity, and low in cost; meanwhile, strong acid acidification and diethyl ether extraction used in the traditional method are avoided; the safety of the preparation process is greatly improved.

The invention discloses a polyolefin resin nucleating agent and a preparation method thereof. The nucleating agent of the invention is a polyol diacetal-silica gel graft having the following general formula (I): the nucleating agent of the present invention The stability of the organic acetal is improved, the environmental protection performance is improved, and the production cost is reduced, especially the mechanical performance and thermal performance of the polyolefin resin are significantly improved.

The invention relates to a method for removing complex-state heavy metals from a magnetic iron-based material through reduction decomplexing. The method comprises the following steps: weighing ferrite, dissolving ferrite into water which does not contain dissolved oxygen, adding Fe3O4 nano-particles, gradually adding an anaerobic NaOH solution into the solution, and simultaneously stirring to react for 10-30 minutes, so as to obtain black green turbid liquid; regulating the pH value of wastewater containing heavy metals to be more than 5.0, and controlling oxidation reduction potential ORP of the wastewater to be less than 100mV in an nitrogen aeration manner; adding a Na2CO3 solution according to the primary concentration of CO3<2-> in the wastewater so as to regulate the concentration CO3<2-> in the wastewater to be more than 500mg / L; adding the black green turbid liquid according to the type and concentration of heavy metal ions in the wastewater, and slowly stirring to react for 30-60 minutes; after the reaction is finished, introducing the wastewater into a magnetic separator, carrying out solid-liquid separation so as to finish the treatment of the wastewater, and separating magnetic seeds for later use. The method has the advantages that the preparation method is simple, conditions are mild, the cost is low, the effluent quality is good, and the reaction flow is short.

The invention discloses a tertiary amine derivative type chlorine-containing amphiphilic polymer and a separation membrane prepared from the polymer. The tertiary amine derivative type chlorine-containing amphiphilic copolymer is formed by polymerizing chlorine-containing macromolecules as a dispersing agent, a small molecule ester as a solubilizer and a chlorine-containing monomer and a tertiaryamine derivative type hydrophilic monomer as raw materials through a free radical suspension polymerization method, wherein the chlorine-containing macromolecular dispersing agent is obtained by carrying out solution copolymerization on a chlorine-containing monomer and a tertiary amine derivative type hydrophilic monomer in an organic solvent. According to the invention, the chlorine-containing macromolecular dispersing agent is adopted and has excellent dispersing effect on chlorine-containing monomers, and the small molecule ester solubilizer can improve the intermiscibility of hydrophilicmonomers and chlorine monomers, so that the high-hydrophilicity chlorine-containing amphiphilic copolymer can be prepared; the tertiary amine derivative type chlorine-containing copolymer can be independently used for preparing a separation membrane or can be blended with other resins to prepare separation membranes; and compared with the existing chlorine-containing separation membrane material,the tertiary amine derivative type chlorine-containing copolymer is good in hydrophilicity, pollution-resistant, low in cost and good in application prospect.

A hydrogen reducing process for separating Rh from Ir solution includes loading the Rh contanied Ir solution into reactor, heating to a certain temp udner ordinary pressure, introducing H2 to it, and hydrogen reducing reaction to reduce Rh into solid metal. Its advantages are high purity (99% for Rh and 99.99% for Ir), short time, and no pollution.

The invention discloses a nonionic functional fluorine-containing polymer and a preparation method thereof. The functional fluorine-containing polymer is a nonionic functional fluorine-containing polymer prepared by the steps of: taking a fluorine-containing monomer, a graftable active monomer and a hydrophilic functional monomer as copolymerization monomers, firstly polymerizing, in a water phase dispersion system, the copolymerization monomers into an active precursor polymer of which the main chain contains an atom transfer free radical polymerization active side group, then initiating a nonionic functional monomer by using the active side group on a solid liquid interface to perform interface atom transfer free radical polymerization, and performing polymerization to form the nonionic functional fluorine-containing polymer containing a nonionic side chain. The nonionic functional fluorine-containing polymer prepared by the method disclosed by the invention has a high functional monomer content and good hydrophilicity, can be applied separately to preparation or together with other resin to blending preparation of a high-hydrophilicity separation membrane, a battery diaphragm, a biological medical material, a coating, a bonding material and a flexible easy-printing packing material, and in comparison with an existing material, is good in hydrophilicity, low in cost, and good in application prospect.

The invention discloses an anionic functionalized fluorine-containing polymer and a preparation method thereof. The functionalized fluorine-containing polymer is prepared through the following steps: subjecting a chlorine-containing monomer, a graftable active monomer and a hydrophilic functionalized monomer as copolymerization monomers to polymerization in an aqueous-phase dispersion system so as to obtain an active precursor polymer with a main chain containing an active side group for atom transfer radical polymerization, initiating an anionic functionalized polymer to interface atom transfer radical polymerization on a solid-liquid interface in an alkaline environment by utilizing the active side group so as to form the anionic functionalized fluorine-containing polymer containing an anionic type side chain. According to the invention, the anionic type side chain contains sulfonic groups and carboxylic groups and has strong electronegativity, so the polymer has strong hydrophilic performance and cation exchange adsorption performance, can be independently used for preparation or is mixed with other resins for preparation of highly-hydrophilic separating membrane products, gel electrolytes, adhesives, battery separators, cation exchange adsorption materials and flexible packaging materials, greatly broadens the application scope of vinyl chloride polymers, and has good application prospects.

The invention discloses a methylene bridging 1,8-naphthyridine ligand and copper (I) complex, a preparing method and an application. The molecular formula of the methylene bridging 1,8-naphthyridine ligand and copper (I) complex is shown in the specification, wherein R1 is hydrogen or methyl. The methylene bridging 1,8-naphthyridine ligand and copper (I) complex is the first complex obtained in the mode that an activation reaction is carried out through a SP3C-H key under the condition that a catalyst is free so far, and it is firstly achieved that a C-C key is activated and constructed through the catalyst-free SP3C-H key. The copper (I) complex can be used as a catalyst of a coupling reaction between aryl halide and imidazole compound C-N, and the yield is high.

The invention provides a method for one-step synthesis of benzonitrile from benzaldehyde and ionic liquid type hydroxylammonium salt. The method comprises the following steps: adding benzaldehyde, zinc chloride, ionic liquid and ionic liquid type hydroxylammonium salt into a reactor; then adding an organic solvent; carrying out stirring and reflux condensation; and carrying out a reaction at normal pressure and a temperature of 90 to 130 DEG C for 2 to 10 h so as to obtain benzonitrile, wherein the ionic liquid type hydroxylammonium salt is N,N,N-trimethyl-N-sulfobutylammonium bisulfate ionic liquid type hydroxylammonium salt, 1-sulfobutyl-3-methylimidazole bisulfate ionic liquid type hydroxylammonium salt and 1-sulfobutylpyridine bisulfate ionic liquid type hydroxylammonium salt. According to the invention, two-step reactions are integrated in one reactor; the method is simple in process and convenient to operate; the ionic liquid has good stability as a catalyst; synthesized benzonitrile is easy to separate; and the ionic liquid conjugated with the ionic liquid type hydroxylamine salt can be used as a catalyst and solvent in the reactions.

The invention relates to a two-enzyme co-expression technique and a two-enzyme coupling and immobilizing technique, and specifically relates to a co-expression preparation method of a site-specific mutant glucose isomerase and a D-allulose 3-epimerase, a coupling and immobilizing technique of the two enzymes and application of the coupled and immobilized two enzymes in producing allulose from jujube condensed juice. In order to solve health problems of people due to high-calorific value sugar, the invention provides a method for promoting the production of low-calorific value D-allulose from the recombinase glucose isomerase and the D-allulose 3-epimerase through co-immobilization and two-enzyme coupling by virtue of a multiple-enzyme coupling and immobilizing technique with D-glucose and D-fructose in the jujube condensed juice as the substrates, and also provides a method for site-specific mutagenesis of an amino acid at the 146th site of the glucose isomerase and co-expression thereof with the D-allulose 3-epimerase.

The invention relates to a method for preparing a non-aqueous and synthesized lead stearate salt. The method directly adopts stearic acid and lead oxide as raw materials, with the existence of the low temperature catalyst ethylene bis stearamide and hydrocarbon compounds such as refined high melting-point wax or liquid wax, at temperature of 70 DEG C to 80 DEG C, combination is conducted for 1 hour to 3 hours and the mixture of n-lead stearate and dibasic lead stearate. In the method, products are generated directly through a reaction without water, no acid or alkaline chemical materials need to be added, the products do not need drying and crushing, thus greatly reducing energy consumption and labor strength; no lead containing waste water is generated; and besides, the method has short reaction process, low energy consumption and low investment and reduces work procedures, costs and labor strength.

The invention discloses a method for catalytically reducing selenium. According to the method, by using oxydol as a catalyst, a reducer is added into a hexavalent-selenium-containing solution to react so as to reduce the selenium into the selenium simple substance, wherein the standard oxidation-reduction potential of the reducer is lower than the standard oxidation-reduction potential in the process of converting the hexavalent selenium into the selenium simple substance. The hexavalent-selenium-containing selenic acid or selenate solution is reduced by one step to prepare the simple substance selenium product. The oxydol, which is used as the catalyst, effectively lowers the descending speed of the solution reduction potential on the premise of performing the catalytic function, so that the reduction reaction process is carried out mildly, thereby effectively preventing the selenium in the solution from overreduction to generate negatively bivalent selenium ions or compounds thereof, and solving the problems of low recovery rate and the like caused by selenium overreduction.

The invention discloses a synthetic technology of vulcanizing isobutene with one-step method in the sulfide technique field of acyclic unsaturated carbon skeleton, which comprises the following steps: adding the elemental sulfur and accelerant in autoclave; heating to 150-250Deg. C; mixing for 0.5 hours; adding isobutene in the autoclave slowly; increasing the pressure to 2-10MPa for 1-8 hours; cooling less than 80Deg. C; extruding the mixture from the high-pressure autoclave with the rest pressure; separating the organic phase after stewing and layering; distilling; filtering; getting the vulcanized isobutene product( the accelerant is inorganic weak base material). The invention is provided the high efficient, the low cost and the clean reaction, which solves the prior technique problem.

The invention discloses a method for making antineoplastic medicine nedaplatin C2H8N2O3Pt. The method comprises the following technological processes that: cis-diiododiaminoplatinum (II) is taken as reactant; an amount of water is added in the reactant and is evenly stirred; then, argentum glycolate C2H3O3Ag and AgNO3 are slowly added in the solution with the molar ratio Pt (NH3) 2I2: C2H3O3Ag:AgNO3 equal to 1:1:1, and are reacted at a temperature of between 50 and 60 DEG C for 2 to 3 hours; after solid is filtered out, the filtrate is heated to 40 DEG C, and the pH value of the filtrate is adjusted to 7 by NaOH; the obtained solution is heated to 50 to 60 DEG C so as to carry out reaction for 4 hours; finally, the reaction liquid undergoes decompression condensation to obtain nedaplatin solid. The method has short process flow, high yield (above 56 percent) and high product purity.

The invention provides a preparation method of an indoline derivative for synthesizing silodosin. Indoline is taken as a starting raw material and reacts with benzoic acid and 1-chloro-3-bromopropane to prepare a compound (1); a reaction is carried out in a Vilsmeier agent, and a formyl group in introduced to the 5th position to prepare a compound (2); the compound (2) and nitroethane undergoes an asymmetric Henry reaction in the catalysis of quinidine-copper acetate to prepare a compound (3); the compound (3) is subjected to acetylation through acetic anhydride to prepare a compound (4); a cyano group is introduced to the 7th position to prepare a compound (6); and two functional groups are reduced through palladium-on-carbon hydrogenation in one step to obtain a high-chiral-purity target compound: (R)-1-[1-(3-benzoyloxypropyl)-5-(2-aminopropyl)-7-cyano]indoline. In the early stage of the method, cheap quinidine is used to perform an asymmetric Henry reaction for introduction of chiral centers, thereby avoiding resolution in the latter stage. The method is reasonable in design, simple to operate, effectively improved in yield and reduced in cost, and therefore is suitable for massive production.

The invention discloses a noncellular synthetic biology based preparation method of 2-phenylethanol and an application. According to the preparation method and the application, three recombinases including ARO8, ARO10 and ADH1 are utilized to constitute a co-reaction system, and a complicated metabolic process of an Ehrlich pathway requiring multi-step continuous reaction and multi-enzyme participation for synthesis of 2-phenylethanol in microorganisms is simplified to be performed in the same reaction system in vitro, so that the environmental pollution is reduced and the reaction process is shortened. Furthermore, the three recombinases are subjected to carrier-free co-immobilization with glutaraldehyde serving as a cross-linking agent, Combi-CLEAs (Combi-Cross-linked Enzyme Aggregates) are prepared, a target product is synthesized in vitro, accordingly, the enzymes are further recycled on the basis of the beneficial effects, and the production cost is reduced; the preparation method fills up the technical blank of multi-enzyme preparation of 2-phenylethanol in vitro, and important reference is provided for biological preparation of 2-phenylethanol.