2260 results about "Butanone" patented technology

Methods for the fermentive production of four carbon alcohols are provided. Specifically, butanol, preferably 2-butanol is produced by the fermentive growth of a recombinant bacteria expressing a 2-butanol biosynthetic pathway. The recombinant microorganisms and methods of the invention can also be adapted to produce 2-butanone, an intermediate in the 2-butanol biosynthetic pathways disclosed herein.

The present invention relates to toluenesulfonic acid addition salt crystals of 4-((6bR,10aS)-3-Methyl-2,3,6b,9,10,10a-Hexahydro-1H-Pyrido[3′,4′:4,5]Pyrrolo[1,2,3-De]Quinoxalin-8(7H)-yl)-1-(4-Fluorophenyl)-1-Butanone, the method of making and using such crystals.

A method for the production of 2-butanone by fermentation using a microbial production host is disclosed. The method employs a reduction in temperature during the fermentation process that results in a more robust tolerance of the production host to the butanone product.

A high-hydrophobicity, heat conductivity and adhesivity pigment of interface is prepared by taking methyl chloroform and butanone as medium, liquid-phase treating ordinary carbon black by silicone oil to hydrophobic activate, forming coating into dense methyl surface by polyester modified dimethylsilicone and agitation dispersing by supersonic homogenizer. The formed coating (2) is three-dimensional cross-linking network of cured polyphenylene methyl resin, which contains nanometer carbon black and silicon dioxide, and it forms dense methyl thin layer (3) on coating surface. It can be used to treat heat exchanger surface (1) of indoor apparatus and outer tube fin of household air conditioner. It has good hardness and is non- toxic.

The invention provides a carbon nano material / metal nano material composite nano ink which comprises solvent, an additive, a carbon nano material and a metal nano material. The carbon nano material / metal nano material composite nano ink is characterized in that the solvent can comprise water, alcohol organic solvent (ethanol(alcohol), isopropanol, n-butanol and the like), ester organic solvent (ethyl acetate, butyl acetate, ethylene-propylene acetate and the like), benzene organic solvent (methylbenzene, dimethylbenzene and the like) and ketone organic solvent (cyclohexanone, acetone, methylethylketone, butanone and the like); the additive comprises surfactant, pH value stabilizer, defoaming agent, diluter, reinforcer and the like; the carbon nano material comprises a single-layer carbon nanotube, a double-layer carbon nanotube, a multi-layer carbon nanotube and graphene; the metal (copper, silver, gold, platinum, nickel and the like, also including an alloy nano material, an ITO metal composite nano material and the like) nano material further comprises a metal nanoparticle, a metal nanowire or a metal nanotube; the components of the nano ink must include one carbon nano component and one metal nano component, such as a single-layer carbon nanotube and copper nanowire composite ink, a double-layer carbon nanotube and silver nanowire composite ink, a single-layer carbon nanotube and silver nanoparticle composite ink or any other possible combination; the components can be regulated according to specific applications; and a composite nano conductive film can be formed on different bases through different electronic printing processes. The ink can be used in the printing of a flexible base material and can be conveniently prepared into a flexible conductive film.

The invention belongs to the field of organosilicon, and particularly relates to an organosilicon coating and a preparation method thereof. The organosilicon coating is characterized in that the organosilicon coating comprises 90 to 120 parts of Alpha, Omega-dihydroxy polydimethylpolysiloxane, 10 to 30 parts of MQ resin, 10 to 30 parts of white carbon black, 0.3 to 1 part of vulcanization accelerators, 2 to 3 parts of methyl-tri-(butanone-oxime) silane, 2 to 3 parts of vinyl tributanoximo silane, 1 to 3 parts of propylamino triethoxy silane, 1 to 2 parts of 3-glycidyl ether oxypropyl trimethoxysilane and 70 to 90 parts of solvent. The preparation method comprises the steps of raw material selection, raw material weighing, rubber compound drying, rubber compound preparation, and the like. The organosilicon elastic coating disclosed by the invention has low viscosity and high fluidity, can be rapidly self-leveled and filled after being coated, has a high curing speed at room temperature, needs short surface drying time and curing time, has excellent electric insulation performance, high strength, low hardness, high elasticity and good toughness after being cured, has self-repairing performance and an elongation percentage reaching 200 to 500 percent, has good bonding performance, has shear strength of 2 to 5MPa over aluminum, has little odor, cannot corrode a matrix, adopts solvent oil as the solvent, can effectively insulate and protect the surfaces of printed circuit boards (PCB) and electronic devices, and can also used as other elastic coatings needing insulation performance and anticorrosion performance.

The invention discloses 4-(benzofuran-5-yl)-2-aromatic aminothiazole shown as a chemical structural formula I. The preparation method of the 4-(benzofuran-5-yl)-2-aromatic aminothiazole comprises the following steps of: heating and stirring 2-halogen-1-(7-hydroxyl / alkoxyl-2,2-dimethyl-2,3-dihydrobenzofuran-5-yl) butanone and arylthiourea in acetone for reaction to obtain 4-(benzofuran-5-yl)-2-aromatic aminothiazole salt; and neutralizing the 4-(benzofuran-5-yl)-2-aromatic aminothiazole salt with stronger ammonia water to obtain the 4-(benzofuran-5-yl)-2-aromatic aminothiazole. The 4-(benzofuran-5-yl)-2-aromatic aminothiazole has high insecticidal activity and is applied to the preparation of pesticides.

The invention relates to a preparation method of waterborne polyurethane capable of selfreparing. The preparation method includes the steps that hydrophilic chain extender is added to dihydric alcohol, heating for dehydration is conducted under a vacuum condition, the mixture is cooled to 70-85 DEG C, diisocyanate is added, stirring is conducted for a reaction, then the temperature is cooled to 50-55 DEG C, butanone is added, then a catalyst and the chain extender containing disulfide bonds are added, a reaction is conducted for 0.5-3 hours, then the temperature is cooled to 30-35 DEG C, neutralizer is added, then the mixture is cooled to 20-25 DEG C, distilled water is added, the mixture is stirred till emulsion and dispersion are achieved, ethidene diamine is added, chain extension is conducted for 0.5-1 hour, the butanone is removed, vacuum defomaing is conducted, and waterborne polyurethane capable of being self-repaired is obtained. The waterborne polyurethane prepared through the method can be self-repaired under the heating condition, the required condition is mild, the repairing effect is good, emulsion dispersion stability is good, operation is simple, and environmental friendliness is good.

An adhesive composition that includes a mixture of a cationically polymerizable component, an acidic component, and an initiator is provided. Preferably, the initiator comprises an iodonium salt, a visible light sensitizer, and an electron donor compound, wherein the initiator has a photoinduced potential greater than or equal to that of N,N-dimethylaniline in a standard solution of 2.9x10-5 moles / g diphenyl iodonium hexafluoroantimonate and 1.5x10-5 moles / g camphorquinone in 2-butanone. This adhesive composition is cationically polymerizable and is able to bond to hard tissue and cationic restorative materials upon curing.

The invention relates to method and equipment system for separating and recovering organic oxygen-containing compounds in a Fischer-Tropsch synthesis water phase. The equipment system is integrated by adopting twelve towers including a mixed acid cutting tower, an acetaldehyde rectifying tower, a methanol / ethanol dividing tower, a methanol extraction rectifying tower, a methanol rectifying tower, an acetaldehyde removing tower, an ethanol tower, a propanol concentration extracting tower, a propanol intermittent azeotropic distillation tower, a carboxylic acid extraction tower, a carboxylic acid intermittent rectifying tower and an extraction agent recovering tower matched with the carboxylic acid extraction tower for use. By applying the method and equipment system disclosed by the invention, more than ten kinds of organic oxygen-containing compounds such as acetaldehyde, acetone, methanol, ethanol, normal propyl alcohol, normal butanol, acetic acid, metacetonic acid, butyric acid, butanone and the like can be separated from raw materials; and the products can respectively reach the industrial purity. The method and equipment provided by the invention are economic, effective and reasonable; and according to the method and equipment, efficiency of Fischer-Tropsch synthesis industrial enterprises can be greatly increased, production cost is reduced and goal of clean production can be achieved.

The present invention belongs to the field of biological engineering technology, in particular, it relates to a method for extracting and separating 1,3-propanediol from fermented liquor. It includes the following steps: directly distilling and concentrating fermented liquor with bacteria to 1 / 2-1 / 20 of original volume, cooling, adding ethyl alcohol or methyl alcohol, n-propyl alcohol, isopropyl alcohol, acetone or butanone according to volume ratio of 1:0.3-1:5, settling or filtering or 1000-4500 rpm centrifugal separation and precipitation, taking supernatant fluid, then using alcohol or ketone to wash and precipitating, then settling or filtering or 1000-1500 rpm centrifugal separation and precipitation, taking supernatant fluid, then recovering alcohol or ketone from said supernatant fluid by means of distillation or rectification.

The invention provides a piece of novel sewing-free hot melt adhesive TPU-PU leather, and a preparation method thereof. The TPU-PU leather comprises release paper, a hot melt adhesive film, a TPU film and a dry-type PU film, wherein the release paper comprises a paper bottom layer, an adhesive layer, a plastic layer, a transition layer, and a release layer; a hot melt adhesive raw material is composed of polyester polyol, diisocyanate, polyether polyol, and a plurality of additives; a TPU raw material is composed of polymer polybasic alcohol, 1,4-cyclohexane-diisocyanate, a chain extender and a plurality of functional additives; a PU raw material is composed of polyester dibasic alcohol, straight chain diol, isocyanate, TDI trimer, dimethyl formamide, butanone, black sand, and a plurality of functional addictives. Through the adoption of the preparation method, innovations are conducted on the raw material components of the release paper, the hot melt adhesive, the TPU film and the PU film; the manufactured sewing-free TPU-PU leather has the technical advantages of firmness in adhesion, durability, environment-friendly materials, no invisible harm to a human body, and the like.

The invention relates to a method for preparing an electrolyte ceramic membrane of a lithium ion battery, in particular to a tape casting method for preparing the electrolyte ceramic membrane of the lithium ion battery, and belongs to the field of ion conductive ceramic materials. The invention adopts the tape casting method; ceramic powder with a chemical formula of Li1.4Al0.4(Gel-xTix)1.6(PO4)3(wherein x is equal to 0-1.0) is selected as raw material powder; triethanolamine or phosphate are selected as a dispersing agent; ethanol, propyl alcohol, butanone, triclene, or azeotropic solution prepared from any two of the ethanol, propyl alcohol, butanone and triclene is selected as a solvent; polyvinyl butyral (PVB) is selected as an adhesive; polyethylene glycol or dibutyl phthalate is selected as a plasticizer; the range of solid content of slurry is controlled between 18 and 30vol percent; the uniform slurry is prepared through ball milling, and then is prepared into a green belt bythe tape casting method, and the green belt is subjected to heat treatment to form the electrolyte ceramic membrane; and the electrolyte ceramic membrane has good strength and toughness, and can be applied to actual production.

The invention provides a transparent hydrophobic and oleophobic functional coating material. The transparent hydrophobic and oleophobic functional coating material is prepared from fluorine-containing resin, silicon dioxide particles and a solvent, wherein the mass concentration of the fluorine-containing resin is 5 to 15%; the mass of the silicon dioxide particles accounts for 1 to 5% of the mass of the fluorine-containing resin; the fluorine-containing resin contains at least one of fluorine-containing acrylic resin, fluorocarbon resin, fluorine-containing acrylic modified polyurethane resin and fluorine-containing acrylic modified organic silicon resin; the fluorine content of the fluorine-containing resin is 10 to 50wt%, the particle size of the silicon dioxide particles is 10 to 40 nanometers, and a modifying solvent uses a fluoroalkyl silane coupling agent to modify; the solvent is prepared from ethyl acetate, butyl acetate, isoamyl acetate, ethyl butyrate, acetone, butanone, cyclohexanone, methylbenzene, xylene or nonafluorobutyl ether. The invention also provides a transparent hydrophobic and oleophobic functional coating layer which is made of the transparent hydrophobic and oleophobic functional material.

The invention discloses a down coat fabric treatment method for preventing down feather from escaping from needle holes. The down coat fabric treatment method is mainly technically characterized in that 100 parts by weight of a polyether polyurethane coating adhesive, 20-30 parts of a hydroxy terminated polydimethylsiloxane emulsion, 1-1.5 parts of an isocyanate cross-linking agent, 1.2-1.8 parts by weight of a cross-linking promoter, 3-5 parts of silicon dioxide extinction powder and 15 parts of butanone or toluene are mixed to prepare a coating adhesive, which is applied to a fabric by a floating knife coating machine, and the dry weight increase reaches 4-6 g / m<2>. The effect of preventing down feather from escaping from sewing needle holes is good, and the cold resistance, moisture permeability, washing fastness and flexibility of a fabric are ensured.

The invention discloses a high-adhesion benzene-free environmentally-friendly universal jet ink and a preparation method thereof, the jet ink is prepared by the following raw materials and solvents by weight percent: 5-10 of modified chlorinated polypropylene resin; 1-5 of complex resin; 70-89 of butanone; 2-6 of dye; 0.5-1.5 of conductive auxiliary agent; 1-3 of plasticizing agent; 0.5-1.5 of liquid paraffin; and 1-3 of other auxiliary agents. During the preparation, the modified chlorinated polypropylene resin and the complex resin are dissolved in 50-70% of butanone based on the total quantity, the rest butanone is used for the dissolution of other ingredients, the ink jet can be prepared by mixing both, and the resultant ink jet has excellent adhesion for the surface of polyethylene, polypropylene, metallic aluminum material, glass, PET, PVC and PVA materials; since only butanone is used as the solvent, the environmental friendliness of the jet ink is greatly enhanced; and the jet ink with stable system, clear print and fast drying can take the place of a large number of commercial jet ink products at present.

The invention relates to a preparation method of a CEM-3 copper clad plate with high heat conductivity, which comprises the following processes and steps of: (1) preparing a core material: selecting epoxy resin / phenolic resin as a main curing agent, adding a coupling agent, padding and a curing accelerator and preparing into resin liquid for the core material with butanone, and soaking glass fiber paper into a semi-cured state with the core material glue to obtain the core material; (2) preparing a facing material: dissolving the epoxy resin / phenolic resin curing system with butanone, adding padding and preparing into resin liquid for the facing material with butanone, soaking glass fiber cloth into the resin liquid, and curing to obtain the facing material; and (3) proportioning and molding by laminating. The invention not only has the insulating property, the electrical properties, the mechanical properties and other basic properties of a general universal CEM-3 composite copper clad plate, but also has excellent heat conductivity, high CTI, higher heat resistance and excellent PCB (printed circuit board) processing performance. The invention is suitable for LED (Light Emitting Diode), vehicle systems, variable-frequency power sources and other products needing excellent heat conductivity, and can greatly improve the heat dispersion of electronic devices and improve the reliability of electronic products.

The invention discloses a polyurethane resin compound ink and preparation method thereof, comprising polyurethane resin, chloride-vinyl acetate resin, solvent, dye and dispersing auxiliary, wherein the solvent comprises methyl benzene, butanone, isopropyl alcohol. The composition of the polyurethane resin compound ink is: polyurethane resin liquor (30% solid content) 25-40%, chloride-vinyl acetate resin 0-4%, dye 5-25%, dispersing auxiliary 0.2-0.5%, methyl benzene 0-20%, butanone 25-35%, isopropyl alcohol 5-15%. The invention provides polyurethane resin compound ink with wide application range, good thermal stability, good adhesion and no aromatics solvent, in order to conquer the lacks such as not environment protection, narrow application range and bad thermal stability.

A method for measuring main carbonyl compounds in a main stream smoke of a cigarette through ultra high performance convergence chromatography is a method for measuring butyraldehyde, 2-butanone, propionaldehyde, crotonaldehyde, acrolein, acetone, acetaldehyde and formaldehyde in the main stream smoke. The method is characterized in that a filter leaf processed with a derivatization reagent is used to gather the main carbonyl compounds in the main stream smoke of the cigarette, the analyzing and measuring method is used to obtain the contents of the eight carbonyl compounds in the main stream smoke through ultra high performance convergence chromatography (UPC2). When the method provided by the invention is used to detect the contents of the main carbonyl compounds in the main stream smoke of the cigarette rapidly and effectively, the pretreatment is simple, the average relative standard deviation is less than 7%, and the average recovery rate of various indexes is between 75%-94%. The method has the advantages of rapidness, accuracy, high flexibility and good repeatability.

The invention relates to a separation and recovery method of organic matters in high-temperature Fischer-Tropsch synthesis reaction water. The method comprises steps of: (1) separating and recoverying aldehyde after rectifying and removing organic acid; (2) rectifying and separating ketone / n-propanol; (3) rectifying and separating acetone / butanone; (4) refining acetone; (5) extracting and separating butanone / ethanol; (6) rectifying and separating ethanol / n-propanol; further rectifying alcohol-containing aqueous sollution obatained from the bottom of a column for rectifying and separating ketone / n-propanol, ethanol containing little water and obtained from the top of the column, and n-propanol alcohol-containing aqueous sollution obatained from the bottom of the column; (7) azeotropic rectifying ethanol sollution obtained by exaction and separation, and ethanol sollution with n-propanol separated to prepare anhydrous ethanol; (8) adding calces in n-propanol aqueous sollution, distilling to obtain n-propanol products; the invention effectively and orderly separates and recoveries aldehyde, acetone, butanone, ethanol and n-propanol, the purity of each product is above 95% and the yield is above 90%.

The invention discloses a preparation method of light-resistant waterborne polyurethane, which comprises the steps of mixing polytetramethylene ether glycol with diisocyanate in the presence of a dibutyltin dilaurate catalyst, stirring at 70-90 DEG C for reaction for 2-4h, obtaining a polyurethane prepolymer, adding a hydrophilic chain extender, a polyhydroxyl compound and butanone into the polyurethane prepolymer, stirring at 70-90 DEG C for reaction for 1.0-3.5 h, adding triethylamine for neutralizing, stirring for reaction for 40-60min, adding water for emulsification to form hydrophilic polyurethane, adding a nano emulsion into a hydrophilic polyurethane system, shearing and stirring for 40-60min under the condition that a pH value is 7, and obtaining light-resistant waterborne polyurethane. Prepared light-resistant waterborne polyurethane is environment-friendly and low in price, and can meet the demand of a market on a property of light-resistant polyurethane.

The invention provides a method for extracting lithium from salt lake brine. The method comprises the following steps: 1) preparing extract organic phases which comprise a composite extracting agent and a diluent, wherein the composite extracting agent is prepared by mixing tributyl phosphate with N,N-bis(2-ethylhexyl)-3-butanone acetamide according to a volume percent ratio of 50% to 50%; the diluent is sulfonated kerosene; 2) preparing an extract water phase which is an LiCl-MgCl2-H2O system; 3) adding HCl and FeCl3.6H2O to the extract water phase, wherein the ratio of amount of substances of iron and lithium is controlled to be 1.3 to 1, the acid concentration is 0.5mol / L, and the lithium concentration is 1-3g / L; 4) standing after fully mixing the extract water phase obtained in the step 3) with the extract organic phases obtained in the step 1) in a volume ratio of 1 to 2, and then separating a liquid phase. By adopting the method, the problems that the corrosivity of high-concentration tributyl phosphate towards extraction equipment is stronger and the dissolution loss of the extracting agent in water is serious in long-term operation are solved, and the lithium extraction efficiency of the prior art is achieved. The extraction method is simple and reliable to operate.

The invention relates to a method for detecting eight volatile carbonyl compounds in a filter tip through liquid chromatography-tandem mass spectrometry. The eight volatile carbonyl compounds are formaldehyde, acetaldehyde, propanal, acetone, acraldehyde, crotonaldehyde, butanal and 2-butanone. The method comprises the following steps: performing ultrasonic extraction on the carbonyl compounds in a filter tip by using an acetonitrile / water mixed solution, performing 2,4-dinitrophenylhydrazine derivatization reaction, and analyzing through a liquid chromatography-tandem mass spectrometer (LC-MS / MS). Compared with the original gas chromatography, the LC-MS / MS method used in the method has the following advantages: (1) the LC-MS / MS method is higher in sensitivity, and the two-stage mass spectrometry can more effectively eliminate the false positive result, thus ensuring that the qualitative analysis accuracy is higher; (2) separation is performed through liquid chromatography, and 2,4-dinitrophenylhydrazone of the carbonyl compounds has favorable stability; (3) the sample does not need to be purified, and the pretreatment is simple and efficient; and (4) the method can realize the simultaneous detection of the eight volatile carbonyl compounds.

The invention relates to 1-(1,2-epoxypropyl)-N-nitroimidazoline-2-amine which has a structural formula as shown in the picture. A preparation method of the compound comprises the steps of adding ethylenediamine to a reaction container, dropwise adding epoxy chloropropane in the reaction container while stirring, reacting for 2-3h, cooling, and vaporizing out acetonitrile to obtain epoxypropyl ethylenediamine; taking and dissolving nitroguanidine and the epoxypropyl ethylenediamine into water, dropwise adding hydrochloric acid solution while stirring, reacting for 2-3h, cooling, extracting, desolventizing to obtain crude product, and recrystallizating to obtain the product; or adding N-nitroimidazoline, potassium carbonate and organic solvent to the reaction container, heating to 75-81.6 DEG C, dropwise adding epoxy chloropropane in the reaction container after dissolving the N-nitroimidazoline, continuously heating until completing the reaction after dropwise adding, cooling reaction products, filtering, vaporizing filtrate to dry, adding water to residues, extracting by using methylene dichloride, desolventizing to obtain phase product, and recrystallizating by using butanone to obtain the product.

The invention relates to a chemical coating used for leather chemical industry and a preparation method thereof, in particular to a leather flatting coating composition and a preparation method thereof. The leather flatting coating composition comprises the following components in percentage by weight: 35 to 50 percent of polyurethane resin, 3 to 10 percent of dimethyl formamide, 10 to 15 percent of butanone, 20 to 30 percent of butyl acetate, 5 to 15 percent of acetic ether, 3 to 6 percent of flatting agent, 0.5 to 2 percent of handfeel agent, 0.5 to 2 percent of dispersant, 0.5 to 2 percent of color developing agent, and 0 to 1.5 percent of thickening agent. In addition, the invention also discloses the method for preparing the flatting coating. Compared with the common market coating, the flatting coating has the characteristics of wide application, high dullness, good transparency and good handfeel. The leather flatting coating composition is suitable for common leather surface treatment and high-grade leather surface treatment, and has lasting effects.

The invention relates to a weather resistant epoxy-polyurethane anti-corrosion coating and a manufacturing method thereof, which adds phenol-A epoxy resin, bisphenol-F epoxy resin, hydroxyl contained saturated polyester resin and fluorocarbon resin into the mixed solvent of dimethylbenzene, n-butyl acetate, methyl isobutyl ketone and butanone; then adds rutile type titanium pigment, saponite, sericite in powder, polyacrylate co-polymer, polymethyl alkyl siloxane, benzotriazole, gas phase silica and iso-caprylic acid znic to make the fluid A of the weather resistant epoxy-polyurethane anti-corrosion coating while adds fatty group polyisocyanate into the mixed liquor of anhydro-dimethylbenzene and the n-butyl acetate to make fluid B, and mix the two components during application. The invention can be applied to the preservation of the surfaces of outdoor steel structures, pipes and concrete requiring weather resistance, light aging resistance and acid, alkali and salt corrosion resistance.

The invention belongs to the technical field of tobacco packing box, and in particular relates to a method for detecting contents of 21 volatile organic compounds (VOC), including benzene, methyl benzene, p-xylene, m-xylene, o-xylene, styrene, methanol, ethanol, acetone, isopropyl alcohol, methyl acetate, normal propyl alcohol, ethyl acetate, butanone, acetic acid isopropyl ester, n-butyl alcohol, propylene glycol monomethyl ether, n-propyl acetate, propylene glycol monoethyl ether, 4-methyl-2-pentanone, butyl acetate, cyclohexanone in a tobacco packing box. The method for detecting 21 volatile organic compounds in the tobacco packing box disclosed by the invention comprises the following steps of: sample pretreatment: preparing a piece of hard box packing paper; cutting and reserving a main packing surface by an area of 22.0cm*5.5cm; rolling the printing surface of the sample inwards to obtain a barrel-shaped part; putting the barrel-shaped part in a headspace bottle; adding 1000mu l of glycerol triacetate; sealing, and implementing a headspace-gas chromatography detection. The method disclosed by the invention is high in sensitivity, high in recovery rate, and excellent in precision of detecting result.

The invention discloses a method for catalytically synthesizing an atazanavir intermediate, which comprises the following steps: preparing a magnetic modified mesoporous material, co-immobilizing a carbonyl reduction enzyme and a coenzyme in the magnetic mesoporous material, and catalyzing (3S)-3-(tert-butyloxycarbonyl)amino-1-chloro-4-phenyl-(2R)-butanone by using the immobilized enzyme to generate the (3S)-3-(tert-butyloxycarbonyl)amino-1-chloro-4-phenyl-(2R)-butanol intermediate. The method has the advantages of high recovery rate of the carbonyl reduction enzyme and coenzyme, high regeneration efficiency of the coenzyme, low cost, wide market prospects and the like.

The invention discloses a water-based polyurethane composite emulsion and a preparation method thereof. The preparation method is characterized by comprising the following steps: by using acetone or butanone and acrylic monomer as solvents, polymerizing diisocyanate (HDI), isophorone diisocyanate (IPDI), mixed polyester polyalcohol, dihydroxymethylpropionic acid, 1,4-butanediol, trimethylolpropane monoene propyl ether, 2-hydroxypropyl acrylate and 2-hydroxyethyl acrylate to obtain carboxylic polyurethane; neutralizing with tertiary amine, and removing the solvents to obtain a self-emulsified double-bond-containing water-based polyurethane anionic emulsion; and by using the emulsion as a seed, adding acrylate monomer and a right amount interpenetrating-network crosslinking agent monomer to carry out pre-emulsification, and carrying out seed emulsion polymerization to obtain the composite emulsion in an interpenetrating network structure. The invention has the advantages of energy saving, environmental protection, high early bonding force, safe and reliable technique and stable product quality.

The co-solvent composition for compounding methanol gasoline consists of methyl tert-amyl ether 0-61 weight portions, dimethyl carbonate 0-52 weight portions, methyl tert-butyl ether 0-47 weight portions, allcyl polyoxyethylene ether 0.1-10 weight portions, isopropyl ether 0-10 weight portions, ethyl ether 0-30 wt%, tert-butanol 0-45 weight portions, iso-butanol 0-25 weight portions, isopropanol 0-15 weight portions, antioxidant í‹501íŒ 0-8 weight portions, xylene 0-20 weight portions, urotropin 0-7 weight portions, butanone 0-36 weight portions and acetone 0-20 weight portions. It is added while compounding methanol gasoline to raise the intersolubility between methanol and gasoline and raise the relevant physical and chemical performances of methanol gasoline.