32 results about "Allyl acetate" patented technology

The invention provides a method for preparing allyl acetate and recovering propylene and propane, which comprises the following steps: introducing a gas raw material into a reactor for reaction, pumping out gas in the material from the top of a first absorption tower by using a first compressor to serve as a recycle gas flow, conveying one part of the recycle gas flow into the reactor, and conveying the other part of the recycle gas flow into a second absorption tower; and conveying a part of the exhaust gas flow to the bottom of the second absorption tower, discharging the rest of the exhaust gas flow, and sequentially discharging liquid in the material into a crude product storage tank and a rectifying tower from the bottom of the first absorption tower, and condensing a part of an extracted material flow entering the gas-liquid separation tank from the top of the rectifying tower, introducing the condensed material flow into the top of the second absorption tower as a first absorption liquid to obtain a rich solution, discharging the rich solution into a crude product storage tank, and pumping gas flashed from the crude product storage tank back to the bottom of the first absorption tower. The method provided by the invention is beneficial to reducing the production cost, improving the selectivity of the target product and reducing the carbon dioxide emission of the system.

The invention provides a method for preparing allyl acetate and recovering propylene, which comprises the following steps: gas raw materials are introduced into a reactor for reaction to generate allyl acetate, and the gas raw materials comprise propylene, acetic acid, oxygen and inert gas; condensing the material discharged from the bottom of the reactor by using a condenser, so that the condensed material is discharged into the bottom in the absorption tower; pumping gas in the material back into the reactor from the top of the absorption tower by using a first compressor, and discharging liquid in the material into a crude product storage tank from the bottom of the absorption tower; pumping gas in the material back to the bottom in the absorption tower from the crude product storage tank by using a second compressor, and discharging liquid in the material from the crude product storage tank into a downstream rectifying tower for separation; gas separated by a gas-liquid separation tank communicated with the top of the rectifying tower is introduced into a crude product storage tank, and the second compressor also pumps gas recovered from the gas-liquid separation tank into the crude product storage tank. The method provided by the invention is beneficial to improving the raw material utilization rate so as to reduce the production cost.

The invention relates to a catalyst for preparing allyl acetate through acetylation of propylene and a preparation method of the catalyst. The catalyst comprises a carrier, active components and an auxiliary agent, the average pore size of the carrier is 20-100 nm, the active components are bimetallic palladium Pd and antimony Sb, and the auxiliary agent is potassium acetate. The invention mainly solves the problems of low conversion rate, low selectivity, short service life and the like of the catalyst used in the current acryl acetylation reaction. Compared with the prior art, the catalyst provided by the invention has the advantages of high conversion rate and high selectivity on the acetylation reaction of the propylene, and solves the problem of poor stability of the existing catalyst.

The application belongs to the field of organic synthesis, and discloses a method for preparing chiral 2-(1,3-diarylallyl)malonate by using a Pd / phosphine oxygen bidentate phosphine phenol ligand catalysis, which comprises the following steps: under a protective atmosphere, mixing P, O-bidentate phosphine phenol ligand, a palladium catalyst, N, O-bis(trimethylsilyl)acetamide, a malonate nucleophilic reagent and an allyl acetate electrophilic reagent in dichloromethane, and reacting to obtain chiral 2-(1,3-diarylallyl)malonate product. The system has the advantages of high enantioselectivity, high catalytic efficiency, wide substrate application range and mild conditions.

The invention discloses a positive pole piece and a preparation method thereof, a diaphragm-free battery and a battery. The positive pole piece comprises a positive pole current collector and a positive pole active material layer arranged on at least one side of the positive pole current collector, the positive pole active material layer comprises a polymer, and the polymer is formed by polymerizing at least one of small molecules of the following raw material components: vinylethylene carbonate, vinylene carbonate, 2, 3, 4-trimethyl-1, 3-pentanedione, 2, 3, 4-trimethyl-1, 3-pentanedione and 2, 3, 4-trimethyl-1, 3-pentanedione. The adhesive is prepared from 2, 4-hexadienoic acid, allyl trifluoroacetate, diethyl allylmalonate, allyl methacrylate, allyl chloroformate, allyl phenylacetate, allyl acetate, allyl 4-hydroxybenzoate and allyl phenoxyacetate. The adhesive is prepared from the following raw materials: 1, 4-hexadienoic acid, allyl trifluoroacetate, diethyl allylmalonate, allyl methacrylate, allyl chloroformate, allyl phenylacetate, allyl acetate, allyl 4-hydroxybenzoate and allyl phenoxyacetate. The positive pole piece provided by the invention comprises the polymer, so that the interface impedance can be reduced, and the rate capability of the battery can be improved.

The present invention relates to the technical field of organic synthesis. Disclosed is a method for synthesizing allyl alcohol. The synthesis method comprises the following steps: adding a water-soluble acid-resistant high-boiling-point organic solvent to an aqueous allyl acetate solution and stirring the mixture to form a homogeneous solution; then heating the homogeneous solution, and performing a hydrolysis reaction under the action of a solid acid catalyst to obtain a mixture solution containing allyl alcohol; and then distilling the mixture solution to separate out the high-boiling-point organic solvent to obtain a crude allyl alcohol product. The synthesis method provided by the present invention can significantly improve the single-pass hydrolysis conversion rate of allyl acetate at low costs and achieve efficient and continuous industrial production of allyl alcohol. Moreover, the method can realize the separation of allyl alcohol from the high-boiling-point organic solvent simply by means of a simple distillation separation process. The separated organic solvent has high purity and light color and can be reused. The method has no waste liquid and waste residue generated.

Disclosed are 1,5,6-polysubstituted-2-oxo-3-oxabicyclo[3.1.0]hexane and a preparation method thereof. The reaction process comprises the following steps: using α-substituted allyl acetate as a raw material under the action of an inexpensive metal catalyst, the acetic acid acrylate structure contains a cyclopropane-γ-lactone structure, and the substituent types are diverse, making it easy to perform subsequent derivatization modification. The target product is prepared efficiently and with high non-corresponding selectivity through a one-pot process. The method has the advantages of simple and readily available raw materials, mild reaction conditions, simple operation, wide substrate universality, easy large-scale production, no safety hazards, and low cost, and can provide support for relevant drug activity testing.

This invention discloses a system and method for preparing 4-acetoxybutyraldehyde by hydroformylation of allyl acetate. The system includes a reaction unit, a separation unit, and a product tank connected in sequence, as well as a dynamic dehydration unit that forms a loop with the reaction unit through pipelines and pumps, a catalyst regeneration unit connected to the organic phase outlet of the heating unit, and a circulating dehydration unit connected between the catalyst regeneration unit and the reaction unit. The method employs a carbonyl metal catalytic system, using a bypass molecular sieve to dynamically adsorb the self-condensing water of the reaction. After separating the aldehyde product, the remaining organic phase is deeply dehydrated by the molecular sieve and recycled. This invention reduces the water content in the reaction system by setting up a closed-loop dehydration system throughout the entire process. Through the combined strategy of "dynamic adsorption by molecular sieve + deep dehydration of the circulating phase," it achieves multiple benefits, including "reduced corrosion, reduced highly toxic byproducts, and increased yield."

The invention relates to the technical field of functional resin, and particularly discloses an acrylic resin coated organic silicon elastomer PA (at) SE prepared through aqueous phase suspension emulsion polymerization and a preparation method and application of the acrylic resin coated organic silicon elastomer PA (at) SE. An inner core of the PA (at) SE is a polyorganosiloxane elastomer ViSE formed by hydrosilylation addition reaction of hydrogen-containing polysiloxane, ethylene polysiloxane and a third functional component, and the third functional component comprises vinyl acetate, allyl acetate, allyl phenyl ether, allyl benzyl ether, cyclohexyl vinyl ether, alpha-C8-18 olefin, 1, 6-hexadiene, 1, 2-propylene glycol, 1, 3-propylene glycol, 1, 3-propylene glycol, 1, 3-propylene glycol, 1, 3-propylene glycol, 1, 3-propylene glycol, 1, 3-propylene glycol, 1, 3-propylene glycol, 1, 3-propylene glycol, 1, 3-propylene glycol, 1, 3-propylene glycol and 1, 3-propylene glycol. The additive is one or a mixture of more of 1, 9-decadiene, (poly) ethylene glycol diallyl ether and (poly) propylene glycol diallyl ether. The acrylic resin coated organosilicon elastomer PA (at) SE provided by the invention can be mutually soluble with PC resin and the like, and can also realize toughening and reinforcing effects when being applied to materials such as PC resin and the like.

The application provides a synthesis method of 2-(3-hydroxypropyl)-cyclododecanone, which is as follows: under the action of an alkali catalyst, cyclododecanone and epichlorohydrin are reacted to obtain 2-epoxypropylcyclododecanone, and then hydrogen reduction is carried out to obtain 2-(3-hydroxypropyl)-cyclododecanone. The synthesis route is novel, the reagent such as epichlorohydrin is used for alkylation reaction, the epoxypropyl group can be introduced at the 2 position of cyclododecanone with high efficiency, compared with the alkylation reagents such as allyl alcohol and allyl acetate used in the traditional process, the method does not need a free radical initiator, and the monoalkylated product can be obtained with high selectivity, without double alkylation, multiple alkylation by-products, and the reaction yield is significantly improved. Secondly, the hydrogenation method can selectively obtain 2-(3-hydroxypropyl)-cyclododecanone, the reaction yield is high, and the selectivity is good. The method has good application prospect.

The present invention provides a method for the hydroformylation of allyl acetate that can avoid runaway reaction and equipment overheating. Allyl acetate can undergo hydroformylation with a mixture of hydrogen and carbon monoxide in the presence of a complex catalyst. However, the heat of reaction of the allyl acetate hydroformylation reaction is as high as 1406 J / g. AAC The heat of reaction of the secondary decomposition reaction of allyl acetate is as high as 1167 J / g AAC If the reaction system's heat transfer rate is slower than its heat release rate or a secondary decomposition reaction of allyl acetate occurs, the system temperature may rise above 600°C, causing the reaction equipment to overheat and then overpressure. The present invention adds a suitable organic peroxide to the allyl acetate hydroformylation reaction system. The organic peroxide decomposes at high temperatures when abnormal operating conditions occur, generating active oxygen radicals that promptly destroy the complex catalyst structure and poison the catalyst. This prevents uncontrolled heat release from the allyl acetate hydroformylation reaction, which could lead to equipment overheating or the initiation of a secondary decomposition reaction of allyl acetate.

The present disclosure provides an aqueous composition comprising water and a polymer, the polymer comprises at least one hydrophobic monomer selected from the group consisting of n-hexyl (meth) acrylate, n-octyl (meth) acrylate, lauryl (meth) acrylate, myristyl (meth) acrylate, pentadecane (meth) acrylate, cetyl (meth) acrylate, oleyl (meth) acrylate, erucyl (meth) acrylate, vinyl acetate, vinyl propionate, and at least one of the following monomers. A vinyl versatate, a vinyl stearate, an allyl acetate, an allyl propionate, an allyl versatate, an allyl stearate, and combinations thereof; and at least one hydrophilic monomer selected from the group consisting of an acrylate, an acrylate, an acrylamide, a 2-acrylamido-2-methylpropanesulfonic acid, a 2-acrylamido-2-methylpropanesulfonic acid salt, and combinations thereof, wherein the composition exhibits a particle suspension time of at least 1 hour.

The present application relates to a kind of catalyst for preparing allyl acetate by propylene acetylation and its preparation method.The catalyst includes carrier, active component and adjuvant, the average pore size of the carrier is between 20nm and 100nm, the active component is bimetallic palladium Pd and antimony Sb, and the adjuvant is potassium acetate.The present application mainly solves the problems of low conversion rate, low selectivity and short service life of the catalyst used in the current propylene acetylation reaction.Compared with prior art, the catalyst of the present application has the advantages of high conversion rate and high selectivity for propylene acetylation reaction, and solves the problem of poor stability of existing catalyst.

The invention belongs to the technical field of preparation of allyl acetate, and discloses a supported catalyst and a method for preparing allyl acetate in an allyl alcohol production process by using the supported catalyst. The supported catalyst includes: a catalyst; the active components comprise Pd and Cu, a cocatalyst and a carrier; the content of Pd is 2-10 g / L, and the content of Cu is 0.2-1.5 g / L; the content of the cocatalyst is 20-120 g / L; the cocatalyst comprises zinc acetate, and the mass of the zinc acetate accounts for 60%-100% of the mass of the cocatalyst. The supported catalyst provided by the invention is high in selectivity; and the content of diester in a crude product of allyl acetate can be effectively reduced by using the diester in the preparation of allyl acetate.

The present invention provides a method for preparing allylsilane compounds. Using allyl acetate and tert-butyldiphenylsilylformic acid as starting materials, the reaction is carried out in the presence of a photocatalyst, a metal catalyst, a ligand, and a base to obtain allylsilane compounds. The method of the present invention does not require the use of expensive noble metal catalysts and photocatalysts, has mild reaction conditions, good substrate generality, and a relatively high reaction yield.

Described herein is a dual-functional tetrazine–allyl reagent that enables site-selective disulfide modification in peptides and proteins, serving both as a Michael acceptor for bis-thiols and as a reactive handle for Inverse Electron-Demand Diels–Alder (IEDDA) click chemistry to introduce functional payloads.

The invention discloses a method for preparing 4-acetoxybutyraldehyde through allyl acetate hydroformylation and a heterogeneous rhodium catalyst used in the method. According to the method disclosed by the invention, the hyper-crosslinked polymer HCP is adopted to load the rhodium catalyst, so that the reaction condition is mild, the selectivity of the 4-acetoxybutyraldehyde is higher, and the method has a wide industrial prospect.

The present invention discloses a preparation method of allyl alcohol, belonging to the technical field of organic synthesis. The preparation method of the present invention passes an aqueous solution of allyl acetate into a fixed-bed reactor filled with an FeCl3-PBImim-PMO catalyst, and heats it to carry out an ester hydrolysis reaction to obtain a product containing acetic acid and allyl alcohol. The present invention uses an immobilized acidic ionic liquid as a catalyst, enabling the reaction to occur at relatively high temperatures and pressures, endowing the process with a very high reaction rate and conversion rate. The content of allyl acetate in the obtained product is ≤500 ppm, which is beneficial to the subsequent purification and separation of allyl alcohol. In addition, the preparation method of the present invention has simple steps, can adapt to working conditions with different raw material concentration ranges, and the immobilized acidic ionic liquid catalyst can be separated from the reaction system, making the reaction continuous and facilitating industrialization.

The application relates to the technical field of functional resin, and particularly discloses an acrylic resin coated silicone elastomer PA@SE prepared through aqueous phase suspension emulsion polymerization as well as a preparation method and application thereof. The PA@SE has a core-shell structure, the shell layer is linear acrylic resin or slightly crosslinked acrylic resin, the inner core of the PA@SE is polyorganosiloxane elastomer ViSE formed through a silicon-hydrogenation addition reaction of hydrogen-containing polysiloxane, ethylene polysiloxane and a third functional component, and the third functional component includes vinyl acetate, allyl acetate, allyl phenyl ether, allyl benzyl ether, cyclohexyl vinyl ether, alpha-C 8‑18 Olefins, 1,6-hexadiene, 1,9-decadiene, (poly)ethylene glycol diallyl ether, (poly)propylene glycol diallyl ether, or a mixture of one or more thereof. The acrylic resin coated silicone elastomer PA@SE provided by the application can not only be mutually soluble with PC resin and the like, but also can realize toughening and reinforcing effects in PC resin and the like.

The present invention discloses a core-shell structured allyl acetate catalyst, its preparation method, and application. The catalyst comprises a carrier core, and an active component coating and a co-active component coating sequentially coated on the outer surface of the carrier. The carrier is selected from titanium nitride, carbon nitride, vanadium carbide, and titanium carbide. The active component coating comprises an active metal selected from metals such as Pd, Pt, Au, Cu, and Zn, a ligand selected from HHTP, hexasubstituted benzene, and hexasubstituted benzophenone. The substrate is selected from at least one of silica sol, graphene, and silicon powder, preferably graphene or silica sol. The co-active component coating comprises a co-active metal salt and a matrix, the co-active metal salt being selected from alkali metal acetates. The matrix is ​​selected from silica sol, graphene, and silicon powder. The catalyst has the characteristics of high active component dispersion, low activation temperature, high space-time yield, good thermal conductivity, high product selectivity, good stability, and long catalyst life.

The invention relates to a catalyst, system and method for preparing n-propyl acetate and n-propyl alcohol from propylene and acetic acid, and the method comprises the following steps: propylene, acetic acid and oxygen are subjected to an oxygen acetylation reaction under the action of a palladium-antimony bimetallic supported catalyst to generate allyl acetate; after separation and purification, allyl acetate enters a hydrogenation reactor, n-propyl acetate is generated through hydrogenation under the action of a Pd catalyst, after hydrogen is separated through a gas-liquid separator, n-propyl acetate enters a reactive distillation tower, n-propyl acetate and methyl alcohol are subjected to transesterification under the action of alkaline ion exchange resin, and n-propyl alcohol and methyl acetate are generated. And separating and purifying to obtain methyl acetate and normal propyl alcohol. Compared with the prior art, the method is good in atom economy, low in raw material cost, high in catalyst activity, good in stability, high in production continuity degree, simple in subsequent separation and purification, high in product purity and suitable for large-scale production.

The invention provides a preparation method of a Cu-BTC-HSO3 catalyst. The preparation method comprises the following steps: step 1, carrying out solvothermal synthesis on Cu (NO3) 23H2O and trimesic acid in an organic solvent to obtain a Cu-BTC precursor; step 2, uniformly mixing the Cu-BTC precursor with a sulfonic acid group modifier, wherein the addition amount of the sulfonic acid group modifier is 1 wt%-5 wt% of the Cu-BTC precursor; and 3, carrying out vacuum drying at 60-120 DEG C, and activating in inert gas at 200-300 DEG C to obtain the Cu-BTC-HSO3 catalyst. The invention also provides a synthesis method of allyl acetate. The catalyst provided by the invention is beneficial to improvement of esterification-oxidation efficiency and selectivity, has relatively high stability and is beneficial to reduction of cost. According to the synthesis method disclosed by the invention, the conversion rate of propylene is greater than 70%, and the selectivity of allyl acetate is 80% or more.

Provided is a catalyst for producing allyl acetate that shows high activity in an allyl acetate forming reaction and has a low speed of decrease in the specific surface area of a catalyst metal alloy. This catalyst is for use in producing allyl acetate using propylene, acetic acid, and oxygen as raw materials, wherein: (a) palladium, (b) ruthenium, (c) at least one element chosen from the group consisting of copper, nickel, zinc, and cobalt, and (d) an alkali metal salt are supported by (e) a carrier; and the quantity of (b) ruthenium is 20-60 parts by mass relative to 100 parts by mass of (a) palladium.

The invention discloses a preparation method of 4-acetoxybutyraldehyde, which is characterized in that under the catalytic action of a cobalt catalyst and a pyridine diphosphorus ligand, allyl acetate and synthesis gas are subjected to carbonyl synthesis reaction for 2-8 hours under the conditions that the reaction temperature is 80-200 DEG C and the pressure is 3-10 MPa, and the 4-acetoxybutyraldehyde is obtained. The catalytic system containing the cobalt catalyst and the pyridine diphosphorus ligand has the advantages of being high in catalytic activity, easy to recycle and the like, and 4-acetoxybutyraldehyde prepared through the catalytic system is high in conversion rate and yield.

The preparation and recovery system comprises a reactor, a first absorption tower, a first condenser, a first compressor, a second absorption tower, a crude product storage tank, a second compressor, a rectifying tower, a gas-liquid separation tank and a second condenser, the top of the reactor is communicated with a first pipeline, and the bottom of the first absorption tower is communicated with the bottom of the reactor; the top of the first absorption tower is communicated with the first pipeline through a third pipeline, the bottom of the second absorption tower is communicated with the third pipeline through a fourth pipeline, the crude product storage tank is communicated with the bottom of the first absorption tower and the middle lower part of the first absorption tower, the bottom of the second absorption tower is communicated with the crude product storage tank, and the middle part of the rectifying tower is communicated with the crude product storage tank; the bottom of the gas-liquid separation tank is communicated with the top of the second absorption tower through a twelfth pipeline, and the second condenser is mounted on the twelfth pipeline. The preparation and recovery system provided by the utility model is beneficial to reducing the production cost, improving the selectivity of the target product and reducing the carbon dioxide emission of the system.

The invention provides a synthesis method of 2-(3-hydroxypropyl)-cyclododecanone, which is summarized as follows: under the action of a base catalyst, cyclododecanone and epoxy chloropropane react to obtain 2-epoxypropyl cyclododecanone, and then hydrogenation reduction is performed to obtain the 2-(3-hydroxypropyl)-cyclododecanone. The synthetic route is novel, epoxy chloropropane and other reagents are used for alkylation reaction, epoxypropyl can be efficiently introduced to the cyclododecanone 2 site, compared with allyl alcohol, allyl acetate and other alkylation reagents adopted in a traditional process, the method does not need a free radical initiator, a monoalkylated product can be obtained with high selectivity, and the method is suitable for industrial production. And double alkylation and multi-alkylation byproducts do not exist, so that the reaction yield is remarkably improved. Secondly, 2-(3-hydroxypropyl)-cyclododecanone can be selectively obtained by adopting a hydrogenation method, the reaction yield is high, and the selectivity is good. The method has a good application prospect.

The invention belongs to the technical field of synthesis of propylene acetate, and discloses a supported catalyst, a preparation method thereof and a method for synthesizing propylene acetate by using the supported catalyst. The preparation method comprises the following steps: mixing and dispersing a metal palladium source, a metal copper source, a polymer stabilizer and a solvent to prepare a metal precursor solution; after a carrier is treated with alkali liquor, a metal precursor solution is sprayed to the surface of the carrier; then carrying out reduction treatment under the action of a reducing agent; and finally, dipping by adopting an acetate solution to prepare the supported catalyst. The polymer stabilizer is selected from at least one of polyvinyl alcohol, polyimide, carboxymethyl cellulose sodium, polyethyleneimine, polyacrylic acid and polymethyl methacrylate. The supported catalyst for synthesizing allyl acetate provided by the invention has high catalyst activity, can improve the utilization rate of noble metals, the conversion rate of reactants and the selectivity of reaction products, and reduces the synthesis cost of allyl acetate.

The present invention provides a catalyst for allyl acetate production which brings about an improved space time yield when used for producing allyl acetate from propylene, oxygen, and acetic acid. The catalyst for allyl acetate production comprises (a) palladium, (b) iridium, (c) one or more elements selected from among copper, nickel, zinc, and cobalt, and (d) an alkali metal salt which are supported on (e) a support. Particularly, the mass ratio of (a) palladium, (b) iridium, the sum of (c) one or more elements selected from among copper, nickel, zinc, and cobalt, and (d) the alkali metal salt is preferably (a):(b):(c):(d)=100:(5.0-17.0):(5.0-150.0):(150-4,000).

The invention discloses a system and method for preparing 4-acetoxybutyraldehyde through allyl acetate hydroformylation, and the system comprises a reaction unit, a separation unit and a product tank which are connected in sequence, the dynamic water removal unit and the reaction unit form a loop through a pipeline and a pump; the catalyst regeneration unit is connected with an organic phase outlet of the heating unit; the circulating water removal unit is connected between the catalyst regeneration unit and the reaction unit; according to the method, a carbonyl metal catalysis system is adopted, reaction self-condensation water is dynamically adsorbed through a bypass molecular sieve, and after an aldehyde product is separated, the residual organic phase is deeply dehydrated and recycled through the molecular sieve. According to the invention, a whole-flow closed-loop dehydration system is arranged, the water content in a reaction system is reduced, and multiple effects of reducing corrosion, reducing highly toxic by-products and improving the yield are realized through a combined strategy of molecular sieve dynamic adsorption and circulating phase deep dehydration.

The invention provides a method for synthesizing myrcene from monoterpenoid allyl acetate, which comprises the following steps of: reacting monoterpenoid allyl acetate with strong base in the presence of a phase transfer catalyst, and removing one molecule of acetic acid to obtain a myrcene product. The method has the main advantages that the synthesis route is novel, a large amount of easily available monoterpene allyl acetate is used as a raw material, myrcene is obtained through one-step reaction, the reaction condition is mild, high-temperature and high-pressure equipment is not needed, the reaction yield is high, product separation is simple, and high-purity myrcene can be rapidly obtained. Secondly, the phase transfer catalyst is added in the implementation process, so that the reaction time can be effectively shortened, the reaction speed can be increased, and the reaction energy consumption can be reduced. Compared with a common pinene cracking method for synthesizing myrcene at present, the method has good advantages and certain industrial application prospects.