29 results about "Ethyl formate" patented technology

This invention discloses a method for preparing sodium houttuynia cordata, comprising the following steps: adding sodium methoxide and toluene to a reaction vessel, heating, then slowly adding nonanone and ethyl formate, and after the addition is complete, reacting with a gradient cooling process, and post-processing to obtain an aqueous phase containing intermediate I; adding the aqueous phase containing intermediate I and toluene to the reaction vessel, stirring, cooling, and rapidly introducing liquid sulfur dioxide, continuously stirring and reacting at 0-10°C for 5-15 minutes, cooling, and filtering to obtain crude sodium houttuynia cordata. The preparation method of this invention directly introduces liquid sulfur dioxide during the sulfonation reaction, greatly shortening the process time, while achieving high product yield and purity, and requiring less sulfur dioxide. Furthermore, in the post-processing of sodium houttuynia cordata, adding toluene to the reaction solution beforehand can effectively transfer the generated impurities to the toluene; recrystallization using a 50 v / v% ethanol aqueous solution removes water-soluble and oil-soluble impurities while further reducing the risk of fire and explosion during centrifuge operation.

The invention discloses Leishan fish sauce sour essence as well as a preparation method and application thereof. The leishan fish sauce acid essence is prepared from ethyl acetate, absolute ethyl alcohol, ethyl isovalerate, ethyl hexanoate, isoamyl alcohol, furfuryl alcohol, ethyl lactate, ethyl caprylate, acetic acid, diethyl succinate, methyl salicylate, ethyl benzoate, ethyl laurate, hexanoic acid, phenethyl alcohol, 4-methyl guaiacol, ethyl myristate, ethyl palmitate, ethyl oleate, capsicum oleoresin, ethyl phenylacetate and ginger oil. And lactic acid, glycerol triacetate, ocimene, ethyl isovalerate, ethyl butyrate, anethole and phenylacetaldehyde. The Leishan fish sauce sour essence disclosed by the invention is soft and harmonious in overall fragrance, natural and vivid, still has stable flavor characteristics at high temperature, can make up the problem of flavor deficiency in sour soup products, realizes accurate reproduction and controllable release of composite fragrance, improves the standardization level of products, and effectively improves the preference degree of consumers.

The application discloses a kind of pyrimidine-substituted 1,2,4-triazole derivatives, it is characterized in that, with the structure expressed in general formula I or II:Wherein, R1 is hydrogen, methyl, ethyl, methoxy, ethoxy, thiomethyl, chlorine, fluorine, bromine, iodine, cyano, amine group, morpholine, triazole, pyrazole, trifluoromethyl, difluoromethyl, ethyl formate;R2 is hydrogen, methyl, ethyl, methoxy, chlorine, fluorine, bromine, iodine, cyano, amine group, trifluoromethyl, ethyl formate;R3 is hydrogen, methyl, ethyl, methoxy, ethoxy, thiomethyl, chlorine, fluorine, bromine, cyano, amine group, morpholine, triazole, pyrazole, trifluoromethyl, difluoromethyl.The compound of the application shows excellent activity against plant pathogens, such as rice sheath blight fungus, cucumber botrytis, blueberry botrytis, strawberry botrytis, tobacco botrytis, and sclerotinia sclerotiorum.

The invention relates to a plant-source attractant for peach tree pests and application of the plant-source attractant. The plant-source attractant is selected from any one or more of beta-phellandrene, 3-methylene-6-(tert-amyl) cyclohexane-1-ene, 1-isopropyl-4-methylene cyclohexane, 4-methylene cyclohexane-1-ethyl formate, 4-oxoisophorone and 3-carene, and the plant-source attractant is selected from any one or more of beta-phellandrene, 3-methylene-6-(tert-amyl) cyclohexane-1-ene, 1-isopropyl-4-methylene cyclohexane, 4-methylene cyclohexane-1-ethyl formate, 4-oxoisophorone and 3-carene. The compound can be used for preparing a preparation for attracting peach tree pests outdoors. Compared with the prior art, the peach tree pest plant source attractant can trap and kill female adults in external environments such as a field, and the prevention and control effect is greatly improved.

The invention relates to a tobacco flavor with glutinous rice fragrance and tea fragrance flavor and application of the tobacco flavor. The tobacco flavor is prepared from the following components: glutinous rice fragrance tea leaf essential oil, 2-carene, 2-propionyl-3, 4, 5, 6-tetrahydropyridine, 2-acetyl-3, 4, 5, 6-tetrahydropyridine, geraniol, 2-propionyl-1, 4, 5, 6-tetrahydropyridine, piperidine-2-ethyl formate and linalool. The sticky rice fragrance tea leaf essential oil and seven specific spice components are creatively combined to form the mixed spice, compared with single sticky rice fragrance tea leaf essential oil serving as spice, all the components in the mixed spice are matched and synergistic, sticky rice fragrance and tea fragrance are provided when cigarettes are smoked, the fragrance coordination of the cigarettes is obviously improved, and the flavor of the cigarettes is improved. The smoke characteristic of the cigarette is improved; after the spice is used for slow release treatment, the stability of glutinous rice fragrance and tea fragrance flavor can be maintained when cigarettes are smoked, and the flavor of the spice cannot be changed due to the change of the original proportion of the components in the slow release process, so that the sensory quality of tobacco products is comprehensively improved.

The invention discloses a stock pest fumigant and application thereof, the main active components of the fumigant are ethyl formate and mushroom alcohol, and the two components are mixed according to a specific proportion to be used for preventing and controlling stock pests such as callosobruchus maculatus, callosobruchus chinensis, rice weevil and maize weevil. Experiments prove that the blending formula of the fumigant has a remarkable synergistic effect, the defect that the mushroom alcohol is easily adsorbed by a medium is overcome while the single use concentration and the combustion risk of the ethyl formate are reduced; the efficient, safe and economical fumigation prevention and control on the storage object pests such as callosobruchus maculatus, callosobruchus chinensis, rice weevil, corn weevil and tribolium cavaleriei in the storage process of grains and agricultural products are realized. The invention provides a new solution for green prevention and control of stored insect pests.

This invention relates to the field of organic synthesis technology, specifically a method for synthesizing 2-chloro-4-(1H-pyrazol-3-yl)benzonitrile and its application, comprising the following steps: S1. Compound 1a is added to a first organic solvent under inert gas protection and reacted with vinyl isobutyl ether under the conditions of a catalyst and potassium carbonate to obtain a system containing compound 2a; S2. The pH of the system containing compound 2a obtained in step S1 is adjusted to 2-3, and after reaction, compound 1 is obtained through post-treatment; S3. Compound 1 is added to a second organic solvent, and ethyl formate and sodium ethoxide are added to react and obtain a system containing compound 4a; S4. Acetic acid is added to the system containing compound 4a obtained in step S3 for neutralization, and under inert gas protection, hydrazine hydrate is added dropwise to react and the product is obtained through post-treatment. The synthesis method provided by this invention uses readily available raw materials, has a simple processing procedure, does not require column chromatography, simplifies the operation, and facilitates industrial-scale production.

The application provides a synthesis process of an ocinaplon intermediate. S1, petroleum ether, methanol and ethyl formate are mixed to obtain a mixed system, ortho-phenyltoluene and sodium methoxide are added, and reaction is carried out to obtain intermediate 1; S2, intermediate 1 is added into methanol, a palladium-carbon catalyst is added, hydrogen is introduced, and reaction is carried out to obtain intermediate 2; S3, phosphoric acid and a supported catalyst are added into intermediate 2, and reaction is carried out to obtain iminodibenzyl. The problem of low iminodibenzyl yield in the prior art is solved.

The invention discloses a thin-layer chromatography identification method and application of radix cynanchi auriculati traditional Chinese medicine formula granules and radix cynanchi auriculati traditional Chinese medicine formula granules as well as a preparation method of the radix cynanchi auriculati traditional Chinese medicine formula granules and the radix cynanchi auriculati traditional Chinese medicine formula granules, and relates to the technical field of detection methods. The method comprises the following steps: dripping a test solution on a silica gel G thin-layer plate, and developing and inspecting under thin-layer chromatography conditions; thin-layer chromatography conditions are as follows: n-hexane-ethyl formate-formic acid is used as a developing solvent; the volume ratio of the normal hexane to the ethyl formate to the formic acid is 20: 15: 1; the spreading temperature is 4-26 DEG C, and the spreading humidity is 30% rh to 60% rh; compared with a thin-layer chromatogram of the radix cynanchi auriculati traditional Chinese medicine formula granules, the radix cynanchi auriculati charcoal traditional Chinese medicine formula granules have fluorescent spots at the specific shift value of 0.421-0.458. The method can be used for rapidly and effectively identifying the radix cynanchi bungei traditional Chinese medicine formula granules or radix cynanchi bungei charcoal traditional Chinese medicine formula granules which lose the form of the decoction pieces, is simple and convenient to operate, high in precision and sensitivity and good in stability, and has a good application prospect.

The application discloses a high-efficiency cyclization micro-reaction device for pyrazolidine ethyl formate, and relates to the technical field of reaction devices.The device comprises a bottom plate, a stirring unit, an acid-base unit, a heat exchange unit, a heat conduction unit and a heat preservation unit.The top of the bottom plate is provided with a reaction cylinder.The stirring unit is arranged on the top of the reaction cylinder.The acid-base unit is arranged on the top of the stirring unit.The heat exchange unit is arranged on one side of the reaction cylinder, and is used for recycling the temperature of the solution in the reaction cylinder.The heat conduction unit is arranged on one side of the heat exchange unit, and is used for accelerating the heat exchange speed between the solution in the reaction cylinder and the heat exchange unit.The heat preservation unit is used for storing the solution in the reaction cylinder, and can further reuse the temperature of the solution in the reaction cylinder.The device can transfer the heat of the solution in the reaction cylinder which has reacted to the raw material for the next reaction in the heat exchange box, realizes the recycling of the heat in the reaction cylinder, and saves electric energy.

The invention discloses a synthesis method of a hydroximic acid analogue intermediate, and belongs to the field of medicine synthesis. The preparation method comprises the following steps: by taking 3-(2-acetamido-2-oxoethyl)-1, 2, 4-thiadiazole-5-yl amino ethyl formate (III) as a starting material, carrying out five-step reaction of alcoholysis, oxidation, oximation, protective group connection and hydrolysis, so as to obtain (Z)-2-(5-amino-1, 2, 4-thiadiazole-3-yl)-2-triphenylmethoxy imino acetic acid (II). The method provided by the invention has the characteristics of cheap and easily available raw materials, mild and safe reaction conditions, simple and convenient post-treatment and the like, thereby having great production value and social and economic benefits.

The invention relates to a low greenhouse gas emission process for converting carbon dioxide to a commodity chemical, ethyl formate. Carbon dioxide is converted to an aqueous formic acid product using an electro-chemical process, wherein the concentration of formic acid is about 10 wt %. The aqueous formic acid is converted to ethyl formate by esterification of formic acid with bioethanol in a reactor. The product, ethyl formate, is separated from the reaction product and water rejected using an integral low-energy membrane separation system.

The invention provides a high-transparency sulfone polymer as well as a preparation method and application thereof, the sulfone polymer comprises ester impurities with the mass percent of m, m is more than 0 and less than 0.05%, and m is more than 0 and less than 0.05%. The ester impurities are selected from one or more of methyl acetate, methyl formate, methyl N-methylbutyrate, methyl N-ethylbutyrate, ethyl acetate, ethyl formate, ethyl N-methylbutyrate and ethyl N-ethylbutyrate. The sulfone polymer provided by the invention has higher transparency.

The application discloses a preparation method of N1,N2-dimethyl benzene-1,2-diamine and belongs to the technical field of medical intermediate preparation. The method comprises the following steps: taking o-phenylenediamine as a raw material, reacting with ethyl formate, then adopting dimethyl sulfate to perform a nitrogen-methylation reaction, and finally removing a formyl group under the action of an acid to obtain N1,N2-dimethyl benzene-1,2-diamine. In the method, all raw materials can be conveniently purchased on the market, the process of each reaction is simple, there is no expensive catalyst, the yield is high, and the industrialized production is easy.

Provided is a purification process for ethyl formate, belonging to the field of separation and purification. The purification process includes: preparing a molecular sieve doped with aluminum on a surface; modifying the surface of the molecular sieve to obtain a modified molecular sieve, and then combining the modified molecular sieve with porous polymer to obtain a composite, and supporting the composite on a porous matrix to prepare a separation membrane, thereby obtaining a purification material for separation and purification. The process is low in energy consumption and high in separation factor, and a separation material is reusable, and low in use cost.

The utility model relates to the field of ethyl formate high-pressure reaction, and discloses a novel ethyl formate high-pressure reaction reactor which comprises a storage tank, a water pump is arranged at the top of the storage tank, the input end of the water pump is fixedly connected with a conveying pipe, one end of the conveying pipe is fixedly connected with a shell, and a quantifying assembly is arranged in the shell. The quantitative assembly comprises a base, a first baffle and a second baffle, the base is arranged in the shell, the first baffle is arranged on one side of the base, the second baffle is arranged on one side of the first baffle, and an electric push rod and the base are arranged at the top of the base. According to the ethyl formate high-pressure reactor disclosed by the utility model, raw material waste caused by increase of purification difficulty due to reduction of reaction conversion rate caused by unbalanced raw material ratio, local overheating or pressure out-of-control caused by increase of side reaction and increase of purification difficulty during blanking of a traditional ethyl formate high-pressure reactor is effectively avoided, and the effects of efficiently purifying and avoiding raw material waste are achieved.

The invention relates to the technical field of material preparation, separation and purification, in particular to a preparation method and an adsorption method of an ethyl carbamate magnetic molecular imprinting adsorbent. The magnetic surface molecular imprinting adsorbent for removing ethyl carbamate has the characteristics of high adsorption efficiency, low cost, reusability and environment friendliness. The method comprises the following steps: modifying magnetic ferroferric oxide and wrapping a molecular imprinting layer, adding nano ferroferric oxide into absolute ethyl alcohol, carrying out ultrasonic dispersion, dropwise adding tetraethoxysilane and ammonia water, stirring, collecting a solid by using a magnet, washing and drying the obtained solid, re-dispersing the solid into ethyl alcohol, and drying, so as to obtain the magnetic molecularly imprinted polymer. Heating is performed, gamma-(methacryloyloxy) propyl trimethoxy silane (KH-570) is added, and an obtained product is washed and dried; and dispersing the obtained product and ethyl carbamate in a 4-ethylbenzoic acid imprinting system for polymerization, and washing the template to obtain the magnetic surface molecular imprinting adsorbent.

The application belongs to the field of separation and purification, and particularly relates to a purification process of ethyl formate, and preparation of a molecular sieve with an aluminum-doped surface; the surface of the molecular sieve is modified to obtain a modified molecular sieve, then the modified molecular sieve is combined with a porous polymer and loaded on a porous matrix to prepare a separation membrane, and a purified material is obtained, and the purified material is used for separation and purification; the process has low energy consumption, high separation factor, and the separation material can be repeatedly used, and has low use cost.

The invention discloses a chloride ion-free esterified fiber micro-smoke firecracker medicament and a preparation method thereof. Comprising sodium bicarbonate, potassium hydroxide or sodium hydroxide, castor oil, methyl acetate, ethyl formate, ferrocene, manganese dioxide, potassium dichromate and corncob powder fibers. The invention relates to an environment-friendly environment-friendly detergent, which is characterized by comprising 15-25 parts by weight of sodium bicarbonate, 4-10 parts by weight of potassium hydroxide or 8-12 parts by weight of sodium hydroxide, 12-22 parts by weight of castor oil, 25-35 parts by weight of methyl acetate, 25-35 parts by weight of ethyl formate, 6-8 parts by weight of potassium dichromate, 10-22 parts by weight of ferrocene, 2-5 parts by weight of manganese dioxide, 100-200 parts by weight of corncob fiber, and 6-8 cubic meters of water. The preparation method comprises the following steps: crushing a fiber coarse material, soaking in a pool, boiling, rinsing, carrying out centrifugal spin-drying, air-drying, squeezing, distilling, carrying out esterification reaction, adding elements such as potassium, sodium, iron, manganese and the like, sieving, mixing and the like to prepare a finished product. The invention has the advantages of no chlorine salt and sulfide, slight smoke, no toxicity, no pungent smell, no harm to human body, safety, environmental protection and the like.

The invention discloses a method for recovering an isomer of ethyl 3-(difluoromethyl)-1-methyl-1H-pyrazole-4-formate in the preparation process of ethyl 3-(difluoromethyl)-1-methyl-1H-pyrazole-4-formate, and belongs to the technical field of synthesis of pesticide intermediates, and the method comprises the following steps: (1) preparing a solution containing ethyl 5-(difluoromethyl)-1-methyl-1H-pyrazole-4-formate and a solvent; and (2) adding the solution in the step (1) into an ultraviolet reactor, and irradiating for a certain time at a certain wavelength to obtain the 3-(difluoromethyl)-1-methyl-1H-pyrazole-4-ethyl formate. The preparation method has the characteristics of simple process, easiness in operation, energy conservation, environment friendliness, high reaction rate, high yield and the like.

The invention discloses a bi-component catalyst as well as a preparation method and application thereof, and belongs to the technical field of chemistry and chemical engineering. The bi-component catalyst is prepared from the following raw materials in percentage by mass: 10-70% of a CeO2-based catalyst and the balance of a solid acid catalyst, and the total percentage is 100%. The CeO2-based catalyst is CeO2 or M < x > Ce < 1-x > O2, M is Si, Cu, Zr, In, Al, Mg, Ca, La or Ti, and in the M < x > Ce < 1-x > O2, the molar ratio of M to Ce is (0.01-1): 1; the solid acid is hydrogen type mordenite, hydrogen type ZSM-5 zeolite, hydrogen type Y zeolite, hydrogen type beta zeolite or gamma-Al2O3. By adopting the bi-component catalyst disclosed by the invention, the yield of diethyl carbonate and ethyl formate products is improved, the economical efficiency of the process is improved, and a foundation is laid for industrialization in the future.

The application discloses an interface pretreatment liquid for prelithiation of a positive electrode, a lithium supplementing battery and a preparation method thereof, and relates to the technical field of lithium ion batteries.The interface pretreatment liquid comprises one or more of lithium polysulfide, hydrobromic acid and hydriodic acid as solutes, and comprises 0.1-10% of the solutes and 90-99.9% of solvents in percentage by mass.The solvents are one or more of N-methylpyrrolidone, ethylene carbonate, fluoroethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, gamma-butyrolactone, methyl formate, ethyl formate, methyl acetate, ethyl acetate, ethyl propionate, propyl propionate, ethyl butyrate, propyl butyrate, dimethyl sulfoxide and dimethyl sulfide.The interface pretreatment liquid has the advantages of simple preparation method, simple use method, short soaking time of lithium supplementing positive electrode sheets in the interface pretreatment liquid, good effect, high production efficiency and suitability for industrial production.

The invention discloses 3D printing photosensitive resin capable of improving storage stability and a preparation method. The 3D printing photosensitive resin capable of improving storage stability is prepared from the following components in parts by weight: acrylate oligomer, acrylate monomer, polyvinyl alcohol silicate, photoinitiator, antioxidant, triethyl orthoformate, baking soda and pigment. When the photosensitive resin is exposed in air and absorbs water vapor, the triethyl orthoformate is in contact with water to generate hydrolysis reaction, and ethyl formate and ethanol are generated; ethyl formate and baking soda are subjected to a neutralization reaction, acidity is reduced, and ethyl formate is prevented from further generating acetate and ethyl alcohol; and the generated ethanol increases the wettability and eliminates bubbles at the same time. The method has the beneficial effects that water in the photosensitive resin can react with triethyl orthoformate to generate ethanol, so that the water is eliminated, the flocculation phenomenon can be reduced, and part of bubbles can be eliminated; meanwhile, the amount of generated ethanol can be controlled by adjusting the acidity and alkalinity through baking soda.

The invention belongs to the technical field of biological fermentation, and particularly relates to a leavening agent and application thereof in reducing the content of ethyl carbamate in orchid rice wine and improving the flavor of the orchid rice wine. The saccharomyces cerevisiae CGMCC 2.3866, pichia membranaefaciens CGMCC 2.4060 and short leavening agent lactobacillus CGMCC 1.214 are compounded according to a specific proportion, the obtained leavening agent can be used for fermentation production of the mountain orchid rice wine, standardization of the fermentation process is achieved, the quality of the mountain orchid rice wine is effectively improved, generation of a harmful product ethyl carbamate (EC) in the fermentation process is remarkably reduced, and the yield of the mountain orchid rice wine is increased. The economic loss is reduced and the fermentation period is shortened. Meanwhile, the Shanlan rice is fermented by using the leavening agent disclosed by the invention, so that the Shanlan rice wine is endowed with unique flavor and relatively high nutritional value, the energy consumption and environmental pollution are reduced, the product safety is enhanced, and the applicability and added value of the finished Shanlan rice wine in related industries such as rice wine manufacturing and the like are improved.

This invention discloses a composite tower apparatus and method for extracting a mixture of acetone, methyl acetate, and ethyl formate. The feed liquid enters from the bottom of the tower, while pure water enters from the top. The feed and water undergo countercurrent contact between several layers of sieve-packed composite tower plates. Gas enters from the bottom of the composite tower apparatus, and after passing through a gas distributor, forms a uniform gas flow within the tower, continuously impacting and agitating the liquid phase to enhance interphase mass transfer. After the extraction process is completed between the plates, the gas and liquid phases at the top of the tower are separated by a three-phase separator. The ester phase flows out from the top of the tower, yielding high-purity methyl acetate and ethyl formate, while the gas is discharged from the top. The aqueous phase flows out from the bottom of the tower after clarification in the lower clarification section. The extraction method described in this invention exhibits excellent hydrodynamic performance, with uniform gas-liquid phase distribution, which enhances the contact and mass transfer between the two phases, helps eliminate "dead zones" and channeling within the packing, and significantly improves the mass transfer efficiency of the extraction process.

The invention relates to the technical field of industrial waste gas treatment, and particularly discloses a resource recycling method for waste gas generated in triethyl orthoformate production. The method comprises the following steps: firstly, carrying out gas-liquid separation on the triethyl orthoformate production waste gas to remove fog drops carried in the triethyl orthoformate production waste gas, then adsorbing and separating trace moisture carried in the triethyl orthoformate production waste gas through a specific molecular sieve, and adsorbing and separating rich ethyl formate gas in the triethyl orthoformate production waste gas through specific resin, so that the adsorption rate of ethyl formate can reach 99% or above; then calcium chloride is used for complexing and separating ethanol gas rich in the waste gas, and the ethanol removal rate can reach 98% or above; then, under the condition of a specific catalyst, non-methane total hydrocarbon rich in the waste gas is thoroughly degraded, and the concentration of the non-methane total hydrocarbon in the degraded waste gas can be controlled within 10 mg / m < 3 >; finally, the waste gas is dehydrated through a molecular sieve membrane and then enters an ethanol absorption system, acid ethanol is obtained, the acid ethanol can serve as a raw material to be reused in the production process of the triethyl orthoformate, and therefore resource utilization of the waste gas generated in the production of the triethyl orthoformate is achieved.

The invention relates to the field of chemical synthesis of medicines, and particularly discloses a preparation method of bepiridic acid and a novel intermediate compound of the bepiridic acid. The preparation method comprises the following steps: firstly, carrying out Grignard reaction on ethyl formate and a Grignard reagent formed by 5-bromo-1-pentene and magnesium chips to obtain 6-hydroxy-1, 10-undecadiene; and carrying out carboxylic acid decarboxylation hydroalkylation reaction on the bepidioic acid and dimethyl malonic acid under the action of an iron-thiophenol catalytic system, so as to prepare the bepidioic acid. The method has the advantages of short process route, only two-step reaction, cheap and easily available raw materials, mild reaction conditions, simple operation and good industrial production potential.

This invention belongs to the field of wine quality management technology and relates to a method for evaluating and grading the drinking comfort of wine. This method classifies wine into three categories: harmful metabolites, chemical contaminants, and exogenous additives, including methanol, ethyl carbamate, biogenic amines, heavy metals, pesticide residues, and sulfur dioxide. Based on the limits for each substance, the drinking comfort of wine is divided into three levels from high to low: DC I, DC II, and DC III. Different specific indicators are set for different types of wine, such as red and white wine, and different types of wine, such as dry and sweet. This invention establishes an objective and data-driven grading system by quantifying safety and comfort indicators directly related to post-drinking physical reactions. It fills the gap in existing wine evaluation systems regarding drinking comfort, provides consumers with a scientific basis for purchasing, and helps producers with product quality positioning and market segmentation.