218 results about "Methyl acetate" patented technology

The invention discloses a wear-resistant vehicle body film and a preparation method thereof, and relates to the technical field of films. The wear-resistant automobile body film prepared by the invention is prepared from polytetrahydrofuran ether glycol, isophorone diisocyanate, a catalyst, dihydric alcohol quaternary ammonium salt, a functional aid, modified silicon dioxide and a chain extender. The dihydric alcohol quaternary ammonium salt is obtained by reacting N, N '-dihexyl-N, N'-dimethyl propane-1, 3-diamine with monochloroacetone and then condensing with glycerol; the functional additive is obtained by reacting 2-boric acid thiophene-4-methyl acetate with 2, 7-dibromofluorene and then carrying out bromination hydrolysis; the modified silicon dioxide is obtained by reacting pretreated silicon dioxide with melamine and then reacting with sodium hypophosphite. The wear-resistant vehicle body film prepared by the invention has good anti-aging, wear-resistant, antibacterial and flame-retardant properties.

The application discloses a catalyst for preparing methyl acetate or ethanol by hydrogenation of dimethyl oxalate and a preparation method thereof. The catalyst comprises an active component, an auxiliary component and a carrier. The active component is a single substance or an oxide of Cu, the auxiliary component is a single substance or an oxide of W, the high active site is a Cu-W alloy interface and single Cu and W metals, and the carrier is one or more than two of silicon dioxide, aluminum oxide, zirconium oxide, zinc oxide, magnesium oxide and cerium oxide. The copper-tungsten alloy catalyst provided by the application has the advantages of structural stability, high mechanical strength, good heat conduction performance, high substrate conversion rate and high product selectivity. The preparation method is simple in steps, easy in raw material acquisition, low in cost, green in pollution, good in preparation repeatability and easy in scale production. The catalyst has extremely high stability and catalytic activity in the reaction of preparing methyl acetate or ethanol by hydrogenation of dimethyl oxalate, high ethanol or methyl acetate yield and high active component utilization rate.

The invention relates to the technical field of household fabrics, and particularly discloses a polypropylene elastic non-woven fabric and a preparation method thereof. The polypropylene elastic non-woven fabric is mainly prepared from the following raw materials in parts by weight: 100 parts of polypropylene, 10-20 parts of an ethylene-octylene copolymer, 2-4 parts of maleic anhydride grafted polypropylene, 1-3 parts of modified nano silicon dioxide and 0.5-2 parts of an antioxidant. The modified nano silicon dioxide is obtained by treating nano silicon dioxide with 3-trimethoxy silane propyl acrylate, oleamide and 2-(4-vinyl phenyl) methyl acetate. Through mutual cooperation of the raw materials, the non-woven fabric has the characteristics of high breaking strength, high elongation at break and high wear resistance, shows excellent comprehensive performance, and can meet the requirements of the non-woven fabric as spring wrapping cloth.

The invention belongs to the technical field of lithium batteries, and relates to a lithium ion battery, in particular to a phosphate battery with both battery rate capability and safety performance. The lithium ion battery comprises a positive plate, a negative plate, a diaphragm and a non-aqueous electrolyte, the positive plate comprises a positive electrode material layer containing a phosphate material; the organic solvent comprises a first solvent, and the first solvent is selected from at least one of methyl acetate, ethyl acetate and methyl propionate; the lithium salt comprises LiPF6 and LiFSI; the first additive comprises a compound as shown in a structural formula 1; the lithium ion battery satisfies 0.02 < = 10c / a + e < = 1.8, 40 < = a < = 60, 1.1 < = b < = 1.5, 0 < e < = 1.5, and 0.05 < = c < = 2. According to the lithium ion battery provided by the invention, high-concentration LiPF6, low-content LiFSI and high-content carboxylic ester are matched with one another, so that the compatibility of rate capability and safety performance of a phosphate battery is realized.

The invention provides a polymer framework ink, a polymer framework and cell-loaded gel collaborative 3D printing method and a structural body. The polymer framework ink contains a high-molecular polymer, an organic solvent and organic modified synthetic flaky silicate, wherein the organic solvent comprises a first solvent and a second solvent, the first solvent is an ethanol aqueous solution and / or absolute ethyl alcohol, and the second solvent is methyl acetate and / or isoflurane. The polymer framework ink provided by the invention is rapidly cured through direct volatilization of the organic solvent; the flake silicate is synthesized through organic modification, so that higher fidelity is obtained, and the effect of rapid shaping is achieved while curing is carried out; different sizes of pores in the polymer filaments can be obtained by controlling the temperature difference between the polymer frame ink and the environment; finally, collaborative printing of the polymer framework and the cell-carrying gel can be realized under mild conditions, and the activity of cells is ensured.

The invention provides a white flower salvia miltiorrhiza composition and application thereof in medicines for preventing and treating atherosclerosis, and belongs to the technical field of traditional Chinese medicines. According to the technical scheme, the composition is characterized by comprising 3-5 parts of white flower salvia miltiorrhiza root slices, 1-2 parts of white flower salvia miltiorrhiza dried leaves and 1-2 parts of white flower salvia miltiorrhiza extract. Mixing the white flower salvia miltiorrhiza leaf powder with a malic acid aqueous solution, carrying out ultrasonic treatment, filtering, and carrying out alcohol precipitation on filtrate to obtain an alcohol precipitate; extracting the white flower salvia miltiorrhiza root powder by using supercritical carbon dioxide to obtain a supercritical extract; mixing the alcohol precipitate and the supercritical extract according to the weight ratio of (7-9): (1-3) to obtain a white flower salvia miltiorrhiza extract; the alcohol used in the alcohol precipitation is methanol; methyl acetate is used as an entrainer in the supercritical carbon dioxide extraction. The white flower salvia miltiorrhiza composition provided by the invention has the beneficial technical effect of remarkably improving atherosclerosis.

This invention provides a flavoring agent for enhancing the honey-sweet aroma of tobacco, comprising the following raw materials and their mass percentages: 0.2-0.3% 2,3-pentanedione, 0.45-0.55% phenylacetic acid, 0.45-0.55% phenethyl acetate, 0.25-0.4% phenylethanol, 0.45-0.6% methyl phenylacetate, 0.45-0.6% ethyl phenylacetate, 0.5-0.6% menthyl acetate, 0.15-0.25% geraniol, and the balance being propylene glycol. This invention belongs to the field of tobacco flavoring technology. By combining 2,3-pentanedione, phenylacetic acid, and phenethyl acetate in a specific mass ratio and conducting testing and evaluation, a flavoring agent suitable for enhancing the honey-sweet aroma of tobacco has been successfully developed. The composition is clearly defined, significantly improving the honey-sweet aroma of tobacco products, with a rich and long-lasting aroma, and good taste harmony.

The invention belongs to the field of pharmaceutical chemical engineering and fine chemical engineering, and relates to a method for recovering 2-cyano-2-methylvaleric acid as shown in a chemical structural formula I. The method comprises the following steps: selecting methyl 2-cyanoacetate and 1-chloropropane, and carrying out catalytic dipropylation under the action of potassium carbonate to prepare methyl 2-cyano-2-valproate; hydrolyzing the latter to obtain 2-cyano-2-valproic acid (crude product) as shown in a formula III; adding water, alcohol and other polar solvents into the 2-cyano-2-valproic acid crude product, pulping, carrying out gradient crystallization, filtering, and carrying out low-temperature vacuum drying to obtain 2-cyano-2-valproic acid monohydrate and 2-cyano-2-methylvalproic acid monohydrate; the 2-cyano-2-valproic acid monohydrate is subjected to high-temperature decarboxylation hydrolysis through sulfuric acid, and valproic acid is prepared; and carrying out high-temperature decarboxylation hydrolysis on the 2-cyano-2-methylpentanoic acid monohydrate by using sulfuric acid to obtain the essence 2-methylpentanoic acid.

This application discloses a method for producing acetonitrile by amination of acetate, comprising the following steps: in a reactor, acetate, ammonia, and a catalyst are contacted and reacted to obtain acetonitrile; wherein the acetate is selected from at least one of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and cyclohexyl acetate; the catalyst is composed of a support and alkaline earth metal oxides and alkali metal oxides supported on the surface of the support; wherein the support is selected from at least one of silicon oxide, aluminum oxide, titanium oxide, and zirconium oxide; wherein the alkaline earth metal oxide is selected from at least one of magnesium oxide, calcium oxide, strontium oxide, and barium oxide; wherein the alkali metal oxide is selected from at least one of lithium oxide, sodium oxide, and potassium oxide; wherein the loading of alkaline earth metal oxide in the catalyst is 0.01–10 wt%, the loading of alkali metal oxide is 0.05–5 wt%, and the remainder is the support.

The invention discloses a catalyst for preparing methyl acetate through carbonylation of dimethyl ether as well as a preparation method and application of the catalyst, and belongs to the technical field of industrial catalysis. A preparation method of a catalyst for preparation of methyl acetate through carbonylation of dimethyl ether comprises the following steps: placing a template agent-containing sodium mordenite molecular sieve in low-temperature plasma, and carrying out modification treatment under a first preset condition to obtain a modified sodium mordenite molecular sieve; performing ammonium ion exchange treatment on the modified sodium-type mordenite molecular sieve to obtain an ammonium-type mordenite molecular sieve; and placing the ammonium type mordenite molecular sieve in low-temperature plasma, and carrying out modification treatment under a second preset condition to obtain the catalyst, wherein the first preset condition comprises that modification treatment is carried out under gradient voltage; the second preset condition comprises modification treatment under a constant voltage. According to the preparation method disclosed by the invention, the acid density, the micropore specific surface area and the micropore volume of the mordenite can be improved, and the mordenite shows higher catalytic activity and stability in a reaction for preparing methyl acetate through dimethyl ether carbonylation.

The invention relates to a preparation method of a trifloxystrobin intermediate (E)-2-(2-bromomethyl phenyl)-2-methoxyimino methyl acetate, and belongs to the technical field of organic chemistry. The method comprises the following steps: by taking a trifloxystrobin intermediate (E)-2-(2-bromomethyl phenyl)-2-methoxyimino methyl acetate containing dibromo impurities as a raw material and an organic solvent I as a reaction medium, carrying out debromination reaction at 5-60 DEG C by using phosphite, desolventizing and extracting a reaction solution, and crystallizing to obtain the high-purity (E)-2-(2-bromomethyl phenyl)-2-methoxyimino methyl acetate. According to the method disclosed by the invention, the dibromo impurity of the trifloxystrobin intermediate is subjected to debromination treatment by adopting the phosphite, so that the dibromo impurity is converted into the trifloxystrobin intermediate. By adopting the method provided by the invention, the conversion time of the dibromo impurity can be obviously shortened, the content and the yield of the trifloxystrobin intermediate obtained by conversion are both higher than 95%, and the reaction efficiency and the quality of the intermediate are greatly improved.

The invention discloses a method for purifying methyl isobutyrylacetate, which comprises the following steps of: introducing a concentrated material obtained at the front end into the middle part of a continuous rectifying tower T1 for rectifying to obtain light components at the top of the tower, and removing dichloromethane, methanol and 3-methyl-2-butanone; a tower kettle substrate of the continuous rectifying tower T1 enters the middle part of a continuous rectifying tower T2 to be rectified, and diethyl methyl ester with the purity of 90% is obtained at the tower top; a tower kettle substrate of the continuous rectifying tower T2 enters the middle part of a continuous rectifying tower T3 to be rectified, and an isobutyryl methyl acetate product is produced at the tower top; the method has the advantages that the methyl isobutyrylacetate is purified by adopting a continuous rectification method, and rectification parameters are optimized, so that the yield of the methyl isobutyrylacetate can reach 85% or above under the condition that the purity of the methyl isobutyrylacetate is not lower than 99%; and the continuous rectification is continuous feeding and continuous extraction, the retention time is short, and the energy consumption is low.

The application discloses a refining device and method and application of a nitrogen-containing solvent precursor. The refining method takes liquid-phase material obtained through cryogenic separation of a gas-phase mixture obtained through an ammoniation reaction as raw material, and obtains acetonitrile main product, acetamide by-product and recycled unreacted raw material through the steps of side-line rectification, component rough separation, three-waste separation and differential pressure separation, and avoids the discharge of polluting gas by dissolving trace impurities and non-condensable gas at low temperature through self-produced wastewater. The application can be used for the separation and refining of liquid-phase reaction product of methyl acetate ammoniation acetonitrile, and is simple in process, friendly to environment, easy to operate and suitable for industrialized large-scale continuous production.

This invention provides a method for preparing and purifying methyl isoglycyrrhizate. The preparation method includes reacting isoglycyrrhizic acid (of formula I) or its salt in a mixed solvent of methanol and methyl acetate in the presence of acetyl chloride. The purification method involves adding crude methyl isoglycyrrhizate to a mixed solvent of organic solvent and water after the reaction, heating and stirring to dissolve; then adding water dropwise, cooling to allow crystallization, and filtering to obtain a solid. This invention, by adding a certain amount of methyl acetate during the reaction, can ensure the conversion rate, control the acidity of the reaction environment, reduce the degradation of methyl isoglycyrrhizate, and greatly improve the product yield and material utilization. The purification method for methyl isoglycyrrhizate provided by this invention can efficiently remove impurity A from the product, is simple to operate, uses little solvent, has a high yield, and is environmentally friendly.

The application discloses a device capable of switching production of refined methyl acetate or acetate and methyl alcohol products, which comprises a fourth rectifying tower capable of switching for separating an aqueous solution of acetate or for rectifying and extracting crude methyl acetate, an eighth rectifying tower capable of switching for removing low-boiling impurities or for evaporating and purifying an extractant and a first rectifying tower capable of switching for extractive rectification of methyl acetate or for removing light components; the fourth rectifying tower is connected with the first rectifying tower, a fifth rectifying tower for refining acetate and a decomposition tower for hydrolyzing methyl acetate respectively; the first rectifying tower is connected with a second rectifying tower for purifying methyl alcohol and a third rectifying tower for removing light components again respectively, and the third rectifying tower is connected with a seventh rectifying tower for removing light components for the third time. The device has two functions, i.e. production of acetate, methyl alcohol and refined methyl acetate can be adjusted in time according to market conditions.

A kind of polyvinylidene fluoride and poly (methyl methacrylate) gradient composite fiber membrane and its preparation method and application, poly (methyl methacrylate) and polyvinylidene fluoride are respectively dissolved in the mixed solution of N, N dimethylformamide and methyl acetate, oil bath stirring, obtain homogeneous transparent spinning solution;The above two kinds of spinning solution are added in needle tube respectively, fixed on microfluidic spinning advance pump, connect infusion hose;Temperature and humidity in spinning bin are controlled, install nylon net on receiver to carry out gradient composite fiber membrane collection, by microfluidic control system, polyvinylidene fluoride and poly (methyl methacrylate) spinning solution pumping is carried out at different change rate, open air valve, and carry out spinning;Gradient composite fiber membrane is taken off from nylon net, and dried to obtain two-component air-blowing poly (methyl methacrylate) and polyvinylidene fluoride gradient composite membrane.

The utility model relates to the technical field of chemical equipment, in particular to a purification device for preparing methyl 4-chloroacetoacetate. By means of the steam absorption pipe in the purification box, most of generated steam can be conveniently absorbed when an evaporation product is heated, the steam absorption pipe is driven by the electric push rod to move, and the telescopic corrugated pipe is connected to the top end of the steam absorption pipe, so that the steam absorption pipe can move in the purification box, and then steam at different positions in the purification box can be conveniently absorbed; the top end of a moving rod penetrates through a box cover and is slidably inserted into a limiting sleeve, a guide rod is slidably sleeved with a guide block, a steam absorption pipe is conveniently limited, the steam absorption pipe is not prone to inclining, a valve body can be opened through an auxiliary absorption pipe at one end of an auxiliary pipe, and steam at the top of the steam absorption pipe can be absorbed; all generated steam can be conveniently discharged out of the purification box through the connecting pipe, so that a small amount of steam is not easy to remain in the purification box, and the preparation purity of a product is not influenced.

The invention discloses a hydrogen recovery device and method for PTA (pure terephthalic acid) production, the hydrogen recovery device comprises a first cooler and a first gas-liquid separation tank, the outlet end of the first cooler is connected with the first gas-liquid separation tank, the first gas-liquid separation tank is connected with a hydrogen recovery washing tower through a pipeline, the bottom of the hydrogen recovery washing tower is connected with an acid recovery device through a pipeline, and the acid recovery device is connected with the acid recovery device through a pipeline. The top of the hydrogen recovery washing tower is connected with a second cooler through a pipeline; the hydrogen recovery washing tower is connected with the oxidation device through a conveying pump so as to convey acid into the hydrogen recovery washing tower, and hydrogen-rich steam is sequentially subjected to acid pickling and desalted water spraying from bottom to top in the hydrogen recovery washing tower; the invention aims to provide the hydrogen recovery device and method for PTA (pure terephthalic acid) production, so that the content of methyl acetate and methanol in the hydrogen recovery process is reduced, the purity of hydrogen is improved, and the production cost is reduced.

This invention discloses a method for synthesizing a mordenite molecular sieve-encapsulated metal catalyst for the synthesis of ester compounds, comprising the following steps: 1) mixing a water-soluble metal salt sequentially with an amine ligand and an alkali metal hydroxide to obtain a preliminary mixture solution; 2) mixing the preliminary mixture solution sequentially with an aluminum source and a silicon source to obtain a gel; 3) crystallizing the gel at 160–180 °C, cooling after crystallization, and separating to obtain an initial solid; 4) drying and calcining the obtained initial solid to obtain a preliminary molecular sieve; 5) placing the preliminary molecular sieve in an inorganic ammonium salt solution for ion exchange, separating the reactants after ion exchange to obtain a solid, drying and calcining the solid to obtain a mordenite molecular sieve-encapsulated metal catalyst for the synthesis of ester compounds. The catalyst obtained by this synthesis method can be used for the carbonylation of dimethyl ether to produce methyl acetate, exhibiting a relatively fast reaction rate while maintaining a high conversion rate of dimethyl ether.

The invention discloses a copper-zinc catalyst, a preparation method thereof and application of the copper-zinc catalyst in preparation of ethanol by hydrogenation of methyl acetate. Comprising the following steps: (1) mixing water, a silicon source, an aluminum source and alkali, stirring I, and crystallizing in a closed container to obtain a solution A; (2) mixing the solution A with an alkali solution, and stirring II to obtain a solution B; (3) mixing water, a copper source, a zinc source and an auxiliary agent source to obtain a solution C; and (4) mixing the solution B and the solution C, controlling the pH value to be 6.5-9.5, aging, washing, drying and roasting to obtain the copper-zinc catalyst. And carrying out hydrogen reduction on the copper-zinc catalyst, and carrying out hydrogenation reaction. The specific surface area of the catalyst prepared by the preparation method provided by the invention is increased, the particle size of the active species Cu is relatively small, the thermal stability of the catalyst is favorably improved, the catalytic activity is remarkably improved, and the catalyst has higher methyl acetate conversion rate and ethanol selectivity.

The invention relates to a mycobacterium hydrolase and application thereof in preparation of flavors and fragrances, and belongs to the fields of enzyme engineering and mining and application of new enzyme resources. The hydrolase comes from mycobacteria, and the amino acid sequence of the hydrolase is shown as SEQ ID No: 2; the hydrolase MdHDL disclosed by the invention has relatively high catalytic activity and substrate concentration tolerance, and can efficiently utilize benzyl alcohol or phenethyl alcohol to react with p-nitrophenyl methyl acetate pNPA, p-nitrophenyl methyl butyrate pNPB or p-nitrophenyl methyl caprylate pNPO to synthesize essence and perfume substances with different flavors; the method is suitable for preparing flower fragrance and fruit fragrance type flavors and fragrances such as jasmine flower fragrance, rose fragrance, pineapple fragrance, banana fragrance and apricot fragrance by an enzyme method, has obvious industrial production potential, and provides technical basis and method guidance for preparing the flower fragrance and fruit fragrance type flavors and fragrances by the enzyme method.

The invention belongs to the technical field of organic synthesis, and particularly relates to a chloroamine synthesis method which comprises the following steps: S1, mixing a hydroxylamine sulfate aqueous solution and methyl acetate, and then dropwise adding a NaOH aqueous solution to react for 1-2 hours; s2, adding trans-1, 3-dichloropropene and the sulfonated niobium-doped TS-1 molecular sieve, uniformly mixing, heating to 60-70 DEG C, and carrying out etherification reaction for 5-6 hours to generate an intermediate product; s3, adding hydrochloric acid into the intermediate product, fully stirring, and carrying out reflux reaction at 60-70 DEG C for 2-3 hours; s4, organic matter is separated through reduced pressure distillation, then a NaOH aqueous solution is added to adjust the pH to be larger than 9, extraction is conducted, the extraction agent is removed through reduced pressure distillation, and chloramine is obtained. According to the synthesis method provided by the invention, the selectivity of the chloro-amine is 99% or above, the yield of the chloro-amine is 98% or above, the production efficiency of the chloro-amine can be effectively improved, and the synthesis method is suitable for industrial application.

The invention discloses a preparation method of polyvinyl alcohol with low sodium acetate content, and belongs to the technical field of polyvinyl alcohol preparation, the preparation method comprises the following steps: S1, adding methyl acetate into a methanol solution of polyvinyl acetate, and uniformly mixing to obtain a mixed solution; adding a methanol solution of sodium hydroxide into the mixed solution, uniformly mixing, transferring to a belt alcoholysis machine, and carrying out alcoholysis reaction to obtain a polyvinyl alcohol solid product after the reaction is finished; s2, the polyvinyl alcohol solid product is smashed, liquid removal and drying are conducted, and polyvinyl alcohol with the low sodium acetate content is obtained.The method only needs to conduct simple technical improvement on an original production line and is easy to implement; through optimization of process parameters, production is stable, continuous production is easy to realize, and the purpose of producing a polyvinyl alcohol product with low alcoholysis degree and low sodium acetate content is achieved.

The invention discloses a method for producing bio-based dihydric alcohol. According to the method, bio-based methyl 2-tetrahydrofuroate, tetrahydrofurfuryl propionate and methyl 2-(tetrahydrofuran-2-yl) acetate are used as precursors for dihydric alcohol synthesis, Cu-Ga-Mn / SiO2 or Cu-Ga-Mn / SiO2-Al2O3 is used as a hydrogenation catalyst, cyclic ether ester structures are synchronously activated in a fixed bed reactor, ester group hydrogenation and tetrahydrofuran ring opening are synergistically carried out, and the high-purity tetrahydrofuran is obtained. The reaction path is shortened. The hydrogenation catalyst is prepared by combining a sol-gel method and hydrothermal synthesis through roasting and reduction, active components are uniformly distributed, and the hydrogenation catalyst has excellent hydrogenation activity and structural stability.

This invention relates to the field of energy storage electronic components, specifically to a lithium-ion battery. The lithium-ion battery includes a positive electrode, a negative electrode, and a separator. The negative electrode includes a negative electrode current collector and a negative electrode active material layer disposed on the surface of the current collector. The non-aqueous electrolyte includes a lithium salt, an organic solvent, and a first additive. The organic solvent includes dimethyl carbonate and a low-viscosity solvent, wherein the low-viscosity solvent is composed of at least one of methyl acetate, ethyl acetate, and ethyl propionate. The lithium-ion battery satisfies the following conditions: 0.05 ≤ 4, 0.01 ≤ a ≤ 2, 25 ≤ b ≤ 55, 4 ≤ c ≤ 30, 10 ≤ d ≤ 30. The lithium-ion battery of this invention can fully utilize the advantages of carboxylic acid ester solvents in increasing battery power, while greatly suppressing their degradation of high-temperature performance and thermal runaway, achieving a balance between high power performance and high safety performance.

The application relates to the technical field of fibers, and discloses a long-acting antibacterial fiber and a preparation process thereof. 1,3,5-tri(methyl acetate trimethyl ammonium bromide) benzene and ethylenediamine are subjected to amidation condensation reaction to obtain a quaternary ammonium salt antibacterial agent, then electrostatic spinning is carried out with polyurethane resin to obtain the long-acting antibacterial fiber. The antibacterial agent contains a large number of positive charges, can destroy the negatively charged cell membranes of bacteria, inhibit the growth of bacteria, has a good killing effect, and significantly improves the long-acting antibacterial performance of the fiber. The quaternary ammonium salt antibacterial agent contains a large number of amide bonds, forms hydrogen bond force with urethane groups of the polyurethane, has good compatibility, has little influence on the mechanical properties of the fiber, the polyurethane fiber maintains good breaking strength and breaking elongation, and can have good mechanical properties and antibacterial performance.

The invention discloses a reaction product separation device and a separation method. The reaction product separation device comprises a circulating tower, a pressure pump, a cooler, a water removal tank, a dehydration tower, a feeding pump and a product tower which are connected in sequence, the product tower is connected with the circulating tower; the circulating tower is also connected with the raw material water separation tank; by adopting an operation method of coupling decantation non-sharp separation rectification and variable pressure crushing azeotropy, the separation device can be used for continuously separating reaction products of a process for preparing methyl acrylate from methyl acetate-formaldehyde in industry, and is simple in process, small in equipment number, simple and convenient to operate and suitable for industrial large-scale separation.

This invention relates to a catalyst for the condensation of methyl acetate and formaldehyde to prepare methyl acrylate, a method for preparing the same, and a method for preparing methyl acrylate. The catalyst disclosed comprises a zirconium-modified silica support and an active component; the active component includes basic active centers and acidic active centers. Applied to the method of condensing methyl acetate and formaldehyde to prepare methyl acrylate, by controlling the supply of formaldehyde monomer from the formaldehyde source and the ratio of methyl acetate to methanol, and simultaneously using a depolymerization reactor to depolymerize the formaldehyde source into formaldehyde monomers, a two-stage condensation reaction of methyl acetate and formaldehyde can be simultaneously catalyzed, effectively improving the yield of methyl acrylate.

This invention discloses a method for producing mixed alcohols using bio-based methyl acetate as a green hydrogen acceptor, relating to the field of biomass energy chemical technology. The method provided by this invention includes at least the following steps: adding green hydrogen and bio-based methyl acetate to a hydrogenation reaction unit; after hydrogenation, a mixture is obtained; adding the mixture to a gas-liquid separation unit; after gas-liquid separation, unreacted green hydrogen and a mixed liquid are obtained; adding the mixed liquid to a distillation unit; after distillation, unreacted bio-based methyl acetate and a mixed alcohol are obtained. The method for producing mixed alcohols provided by this invention achieves efficient green hydrogen carrying capacity and on-site consumption of wind / solar power, while simultaneously enhancing the value of bio-based acetic acid. The product can be directly used as marine fuel, aligning with the "dual carbon" goal and possessing both economic and environmental significance.