342 results about "Methyl butyrate" patented technology

The invention relates generally to the field of industrial microbiology and butanol production. More specifically, the invention relates methods of reducing 2,3-dihydroxy-2-methyl butyrate (DHMB) in butanol production. DHMB can be reduced by inhibiting the reduction of acetolactate to DHMB, for example, by knocking out enzymes that catalyze the reduction or by removing DHMB during or after fermentation. Yeast strains, compositions, and methods for reducing DHMB and increasing butanol yield are provided.

Compositions and lures are described which provide vapor blends of acetic acid and one or more compounds selected from the group consisting of isobutanol, racemic 2-methyl-1-butanol, S-(-)-2-methyl-1-butanol, 2-methyl-2-propanol, heptyl butyrate, and butyl butyrate which function as highly effective attractants for yellowjacket wasps and paper wasps. By attracting wasps to traps or baits, the chemical attractants provide a means for detecting, surveying, monitoring, and controlling the wasps.

There is provided in one embodiment of the invention an electrolyte for use in a lithium ion electrochemical cell. The electrolyte comprises a mixture of an ethylene carbonate (EC), an ethyl methyl carbonate (EMC), an ester cosolvent, and a lithium salt. The ester cosolvent comprises methyl propionate (MP), ethyl propionate (EP), methyl butyrate (MB), ethyl butyrate (EB), propyl butyrate (PB), or butyl butyrate (BB). The electrochemical cell operates in a temperature range of from about −60 degrees Celsius to about 60 degrees Celsius. In another embodiment there is provided a lithium ion electrochemical cell using the electrolyte of the invention.

The invention provides polymer microspheres for high temperature hypersalinity reservoir deep profile control and a preparation method thereof. In the method, based on the method that photopolymerization is used to prepare the polymer microspheres, heat and salt resistance polymer materials such as sodium 3-acryloylamino-3-methyl butyrate, 2-acryloylamino-2-methylpropane sulfonic acid, acrylamide monomer and the like and water-soluble anionic monomer are adopted and dispersant and cross-linking agent are added as so to form oil-water mixed emulsion in the mixed medium of surfactant and solvent; then initiator is decomposed by ultraviolet through photopolymerization under controllable temperature so as to initiate emulsion polymerization and 50-500nm of microspheres are formed. The invention utilizes the ability of microspheres that microspheres can be dispersed in arbitrary concentration and injected in the water and can gradually swell after entering in depth of the formation to plug the pore throat so as to effectively plug the high permeable strip of the formation, expand the water swept volume, significantly increase crude oil recovery of water flooding reservoir and is applicable to high temperature hypersalinity reservoir deep profile control.

Embodiments of the invention relate to a composition for controlling a target pest, wherein the composition includes at least two active ingredients selected from the group consisting of thymyl acetate, linalyl acetate, amyl butyrate, anise star oil, black seed oil, p-cymene, geraniol, isopropyl myristate, d-limonene, linalool, lilac flower oil, methyl salicylate, alpha-pinene, piperonal, piperonyl alcohol, tetrahydrolinalool, thyme oil white, thyme oil red, thymol, vanillin, and winter-green oil, wherein the composition causes synergistic control of the target pest.

The invention relates to a biological preparation method of 3-amino-4-(2,4,5-trifluorophenyl)methyl butyrate. According to the biological preparation method, 3-carbonyl-4-(2,4,5-trifluorophenyl)methyl butyrate is used as a substrate; under the condition that a biocatalyst, a cofactor, an amino donor and a cosolvent exist, the substrate performs the reaction to generate a target product 3-amino-4-(2,4,5-trifluorophenyl)methyl butyrate; the biocatalyst is recombination aminopherase; and the reaction is carried out in water-phase buffer solution with the pH of 6.0 to 9.0. The biological preparation method realizes that 3-carbonyl-4-(2,4,5-trifluorophenyl)methyl butyrate is converted into 3-amino-4-(2,4,5-trifluorophenyl)methyl butyrate by adopting the recombination aminopherase for the first time; compared with a conventional chemical method, the biological preparation method has low energy consumption, is simple and convenient to operate, generates a small number of by-products; and moreover, the product has high optical activity.

The invention relates to a lithium iron phosphate battery with lithium ion battery electrolyte suitable for ultralow-temperature charging and discharging. The lithium ion battery electrolyte comprises lithium salt, a multi-element organic solvent and additives, wherein the additives comprise a low-melting-point additive, a film forming additive and a high-temperature additive; the multi-element organic solvent contains at least three of ethylene carbonate, diethyl carbonate, dimethyl carbonate, methyl ethyl carbonate, propylene carbonate and butylene carbonate; the low-melting-point additive contains at least one of 4-methyl-1,3-dioxolane, methyl acetate, methyl propionate, methyl butyrate, ethyl butyrate, propyl butyrate and butyl acetate; the high-temperature additive is at least one of methyl ester, di-n-propyl carbonate and 1,3-propane sultone. The lithium iron phosphate battery with the electrolyte can charge and discharge at an ultralow temperature and in a high-temperature environment, and is stable in performance and long in recycling life.

The invention provides a sports beverage which contains 0.1-20% of beta-hydroxy-beta-methyl butyrate (HBM). The sports beverage of the invention can be prepared into a liquid beverage capable of being directly drunk, a thickening beverage capable of being drunk after being diluted and a solid beverage capable of being drunk after being made. The sports beverage containing the HMB has the function of accelerating human body muscle synthesis, effectively covers the undesirable flavour of the HMB and is convenient for people taking exercise.

The invention provides a special dietary food suitable for old people with sarcopenia to eat. The special dietary food is characterized by being prepared from the following components in parts by weight: 3-53.5 parts of proteins, 1-2 parts of calcium beta-hydroxy-beta-methyl butyrate, 2-5 parts of dietary fibers, 0.8-2 parts of fatty acid, 0.2-1.3 parts of compound vitamins and 1.5-2 parts of composite mineral substances. The food has the advantages of simple and convenient production process, safety in eating, good mouth feel and no side effect, can be used for delaying the sarcopenia of the old people, has prevention and improvement effects and is suitable for people to use for a long period.

The invention discloses a preparation method of sitagliptin, comprising the following steps: reacting 2, 4, 5-trifluoro-phenylacetic acid with malonic cyclo (sub) isopropyl ester; reacting 3-oxo-4-(2, 4, 5-trifluorophenyl) methyl butyrate with ammonium acetate; reacting 3-amino-4-(2, 4, 5-trifluorophenyl) methyl crotonate with hydrogen; performing hydrolysis reaction to (R)-3-amino-4-(2, 4, 5-trifluorophenyl) methyl butyrate; and reacting (R)-3-amino-4-(2, 4, 5-trifluorophenyl) butyric acid with 3-(trifluoromethyl)-5, 6, 7, 8-tetrahydro-[1, 2, 4] triazol [4, 3-a] pyrazine hydrochloride to obtain sitagliptin. According to the invention, EE value greater than 90% is obtained through high-efficiency catalytic hydrogenation; sitagliptin is prepared by only five steps; yield is higher; technical conditions are mild; operations are simple; cost is low; and yield and purity of products are high.

The invention relates to a quantum-dot light-emitting diode and a preparation method therefor. The structure of the light-emitting diode sequentially comprises an anode, a hole injection layer, a hole transmission layer, a quantum-dot light-emitting layer, an electron transmission layer, and a cathode. The electron transmission layer is a [6, 6]-phenyl-C61-methyl butyrate PCBM film. The preparation method is a spin coating method. According to the invention, the electron transmission layer can effectively improve the exciton recombination probability and the luminous efficiency of a device. Meanwhile, the quantum-dot light-emitting diode is a typical sandwich structure, and the spin coating method is employed for layer-by-layer assembly. The preparation method is simple and feasible, facilitates the preparation of a large-area light-emitting device, and is widely used in the field of quantum-dot light-emitting diodes.

A pouch-type lithium secondary battery includes an electrode assembly having an anode made of carbon material capable of occluding or emitting lithium ions, a cathode made of lithium-containing oxide, and a separator interposed between the cathode and the anode for electrical insulation therebetween; a pouch-type case made of sheet to provide a space receiving the electrode assembly; and a non-aqueous electrolyte injected into the electrode assembly. The non-aqueous electrolyte is a non-linear carbonate-based non-aqueous electrolyte including a lithium salt, (a) a cyclic carbonate compound, and (b) a linear ester compound selected from propionate-based compound, methyl butyrate, and propyl acetate, or their mixtures. During LiPF₆ IM dissolution, the non-aqueous electrolyte has an ion conductivity of 9 mS/cm or above at about 23° C. This pouch-type lithium secondary battery ensures excellent high-rate discharging characteristics and solves swelling problems associated with a pouch-type lithium secondary battery.

The invention discloses a pre-separation method of C5 diene for distilling off methyl butane for two times; two rectifying towers are used for distilling off methyl butane in C5 for two times, whereinthe first distilling is carried out before thermal dimerisation reaction, and the second distilling is carried out after the thermal dimerisation reaction the method comprises four steps: (1) pre-dehydrogenation; (2) distilling off the methyl butane for the first time; (3) thermal dimerisation reaction; (4) distilling off the methyl butane for the second time. Compared with the prior art, the method has the advantages that: the methyl butane is respectively distilled off before and after the thermal dimerisation reaction, the disadvantages that the methyl butane has large loss in the pre thermal dimerisation reaction and the content of cyclopentadiene in methyl butane material flow is hard to control in the latter thermal dimerisation reaction are overcome, thereby better realizing to fully recovering the methyl butane and to effectively control the content of the cyclopentadiene in methyl butane material flow.

The invention provides a preparation method of levetiracetam (I). The method comprises the steps that racemization 2-halogenated butyric acid methyl ester which is in low in cost and easy to obtained is used as a raw material, a biological enzyme method is adopted to synthesize key chiral intermediate (R)-2-halogenated butyric acid methyl ester, the intermediate is subjected to ammonolysis and cyclized with 4-chlorobutyryl chloride, and finally the levetiracetam is obtained. The chiral center is built by the adoption of the enzyme asymmetric catalytic technology, a reaction path is directly reduced to three steps, the comprehensive yield is high, and the cost is low. Compared with a chemical catalyst, a biological enzyme catalyst has the advantages of being high in enantioselectivity and regioselectivity and low in energy consumption, producing few by-products and the three wastes, and the like.

A bulk heterojunction-type organic photovoltaic cell, i.e., BHJ solar cell, has a photoelectric conversion layer containing a mixture of a donor domain and an acceptor domain. The donor domain contains a polymer as a donor (photoelectric conversion material), and the polymer is obtained by reaction of a polyphenylene having a structural unit selected from moieties represented by the following general formulae (1) to (3). For example, the acceptor domain contains phenyl-C₆₁-butyric acid methyl ester (PCBM) as an acceptor. R1 to R8 in the general formulae (1) to (3) independently represent a hydrogen atom, an alkyl group, or an alkoxy group.

The invention provides a preparation method of a cathode and anode-modified perovskite solar cell. The method comprises the following preparation steps: dissolving methyl ammonium iodide and lead chloride into dimethyl formamide to prepare a perovskite precursor solution; dissolving metal nano-particles into ethanol, mutually dissolving with PEDOT:PSS, carrying out processing on a substrate and then carrying out annealing to obtain a cured anode modifying layer; processing the perovskite precursor solution on the anode modifying layer, and then carrying out annealing to obtain a curved photosensitive layer; processing [6,6]-phenyl-C61-methyl butyrate on the photosensitive layer to obtain an electron transport layer; processing an organic material on the electron transport layer to obtain a cathode modifying layer; and processing a cathode electrode on the cathode modifying layer to obtain the cathode and anode-modified perovskite solar cell. The prepared cathode and anode-modified perovskite solar cell is high in energy conversion efficiency and good in photovoltaic characteristics.

The invention relates to a composition with a muscle gain function, which comprises the following active ingredients of creatine, taurine, beetroot extract and beta-hydroxyl-beta-methyl butyrate. The invention further provides a sports drink comprising the composition, and the sports drink comprises the composition and a food additive. The sports drink has the functions that the muscle blood stream can be increased, the oxygen utilization rate can be enhanced, the sports energy consumption can be reduced, so that the motion function can be improved.

The invention relates to a method for preparing a rosuvastatin intermediate which is (R)-3-hydroxy-monomethyl glutarate and hydroxyl-protected (R)-3-hydroxy- monomethyl glutarate. According to the method, (R)-4-cyano-3-hydroxy-methyl butyrate which servers as a substrate is subjected to reaction under the action of an enzyme to generate the (R)-3-hydroxy- monomethyl glutarate, and particularly the enzyme is the recombinant nitrilase, and the reaction is carried out in a aqueous-phase buffering solution with the pH value of 7.0-9.0 at the temperature of 25-35 DEG C. Because the specific recombinant nitrilase is adopted by the method, the problems of ultralow concentration of the substrate and low conversion rate in the existing method for preparing the rosuvastatin intermediate through biological catalysis are solved. The method has the characteristics of mild reaction conditions and high reaction efficiency, is easy and convenient to operate and has important industrial application value.

The invention discloses biodiesel fuel and a preparation method thereof. The biodiesel fuel is prepared by using biomass derivative furfural and acetylpropionic acid as raw materials and by the technology of condensation, oxidation, esterification and complex formulation. The biodiesel fuel contains components of 6-furfurylidene levulinate, methyl furoate and methyl levulinate or ethyl levulinate with carbon atom number between 11 and 18. The advantages comprise that: the biodiesel fuel has high cetane number and oxidation stability, and its thermal efficiency is raised 30-40% than that of tradition biodiesel fuel. The biodiesel fuel can 100% directly be used, and can also be mixed with petroleum diesel fuel for using.

The invention provides a preparation method of a cross-linked fullerene bulk heterojunction perovskite solar cell. The method comprises the following preparation steps: dissolving methyl ammonium iodide, lead chloride and [6,6]-phenyl-C61-butyric styryl dendron ester into dimethyl formamide to prepare 30wt% of perovskite dimethyl formamide solution; processing a PEDOT:PSS solution on a substrate to form cured anode modifying layer; processing the perovskite dimethyl formamide solution on the anode modifying layer to obtain a uniformly cured bulk heterojunction photosensitive layer; processing [6,6]-phenyl-C61-methyl butyrate on the bulk heterojunction photosensitive layer to obtain a uniform electron transport layer; and processing a cathode electrode on the electron transport layer, so as to obtain the cross-linked fullerene bulk heterojunction perovskite solar cell. The perovskite solar cell prepared by the method has the advantages of high energy conversion efficiency and good photovoltaic characteristic.

The invention belongs to the technical field of solar cells. a methylamine lead iodine perovskite solar cell containing an organic light emitting small molecule interface modifying layer. The methylamine lead iodine perovskite solar cell comprises from bottom to top in order: an anode of a glass substrate deposited with a uniform indium tin oxide ITO layer, a poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid PEDOT:PSS film taken as a hole transport layer and deposited on the indium tin oxide ITO layer, an active layer, an organic light-emitting small molecule material tetraphenyl benzene diindene perylene DBP layer taken as an active layer interface modification layer and spinned on the active layer, a [6, 6]-phenylC60-methyl butyrate PC61BM layer taken as an electron transfer layer and spinned on the DBP layer, a [4,7]-diphenyl-[1,10]-phenanthroline Bphen as a cathode modification layer and deposited on the electron transfer layer, and an aluminum film or a silver film as a cathode and performing vacuum heat evaporation on the electron transfer layer.

The invention discloses a preparation method of an intermediate of a rosuvastatin calcium side chain, which comprises the following steps: firstly allowing (R)-4-cyano-3- methyl hydroxybutyrate to react with tert-butyl-dimethylchlorosilane, performing nitrile group hydrolysis in water phase under the action of an enzyme with the obtained (R)-4-cyano-3-tert-butyl dimethylsiloxyl methyl butyrate (II) as a substrate to generate a target product with a structure (I). The invention has the characteristics of being mild in reaction, high in yield, environment friendly, low in cost, and high in chiral purity of the prepared product.