52 results about "Transesterification reaction" patented technology

The application discloses a kind of heat-conducting, wave-absorbing, insulating, high tough rubber composite material and its preparation method and application, it is related to rubber material technical field.The application is prepared into masterbatch by step preparation of epoxidized modified rubber and carboxylated modified rubber after mixing, wherein esterification reaction of carboxyl group and epoxy group and ester exchange reaction of generated dynamic covalent bond realize the dynamic crosslinking of epoxidized modified rubber and the combination with carboxyl rubber, give composite material high tough mechanical property;Selective dispersion of functional filler in isolated double network structure avoids mutual interference between them, realizes the synergistic improvement of heat-conducting, wave-absorbing, insulating performance;Based on volume repulsion effect, filler forms enrichment in the phase, and the composite material can realize high heat-conducting and wave-absorbing performance under low total amount of filler.

This invention discloses a method for preparing a composite alcohol-base catalyst suitable for transesterification reactions, relating to the fields of catalyst preparation technology and organic synthesis technology. This invention uses anhydrous alcohol phase in-situ alcoholization reaction treatment to make the catalyst surface cleaner, reduce the impact of impurities on catalyst activity, and enhance the structural stability of the catalyst. This catalyst can maintain high catalytic activity after multiple uses, extending the catalyst's service life and reducing production costs.

Disclosed is a novel room-temperature curable bio-based epoxy vitrimer with a simple design of the chemical structure. A hempseed oil-derived glycidyl ester type epoxy (HOEP) was synthesized and then blended with a bisphenol A epoxy (DER331) to manipulate the properties of the resulting vitrimer s. An aliphatic amine hardener, diethylenetriamine (DETA), was selected as hardener to realize the room temperature curing in presence of triethanolamine (TEOA) as the catalyst. Unlike the traditional glycidyl ether epoxy-amine the thermosets which are based on sable C—N and ether linkages, the epoxy vitrimer herein includes ester bonds with HOEP and hydroxyls formed from the reaction of amine and epoxy in its cross-linked network. Dynamic transesterification (DTER) between the ester bonds and hydroxyls take place at elevated temperatures, imparting the vitrimer significant stress relaxation behavior and repairability. This provided a viable method to produce room temperature curable epoxy vitrimer s.

This invention discloses an isosorbide-based polycarbonate with a controllable glass transition temperature and its preparation method. The preparation method includes: subjecting isosorbide, hydrogenated bisphenol A, and carbonate diester to at least a transesterification reaction and a polycondensation reaction in the presence of a catalyst to obtain the isosorbide-based polycarbonate with a controllable glass transition temperature. This invention can improve the toughness and processability of isosorbide-based polycarbonate, enhance its UV resistance, and give it a controllable glass transition temperature.

The present application relates to the technical field of high polymer material, and discloses a kind of full plant trinucleotide synergistic high-performance degradable composite material, and is made of oxidized lignin hemicellulose complex 5.0-15.0%, catalyst 0.1-0.3%, plant cellulose 10.0-40.0%, end group protective agent 0.4-0.8%, degradable polyester resin 43.9-84.5%, catalyst is mixed with oxidized complex, and plant cellulose is vacuum dehydrated to free moisture less than 200ppm, and end group protective agent is mixed into premix;The premix is added to polyester resin melted in main feeding port from double-screw extruder side feeding port to carry out melt blending and extrusion granulation.The present application improves the interfacial compatibility of plant fiber and polyester resin by using transesterification reaction, and combines vacuum dehydration treatment and end group protective agent to inhibit the hydrolysis chain scission reaction in the processing of polyester resin, improve the mechanical properties and processing stability of composite material.

This invention relates to the field of crystal materials technology, specifically disclosing a wear-resistant and antibacterial composite leather for electronic skin and its preparation method. The composite leather is composed of delimed bare leather, plant polyphenols, glutaraldehyde, lysine-chitosan graft polymer, tannic acid-zirconium coordination oligomer solution, plant-derived wax esters, and lipase. The preparation method includes: adding plant polyphenols and glutaraldehyde to the delimed bare leather for tanning to obtain primary cross-linked raw leather; adjusting the pH and then adding lysine-chitosan graft polymer and tannic acid-zirconium coordination oligomer for an antibacterial mineralization reaction; then adding plant-derived wax esters and lipase for an enzyme-catalyzed transesterification reaction; finally, drying, rehydrating, and softening to obtain the finished product. This invention, through the synergistic effect of multi-stage processes including composite tanning, synergistic antibacterial action, and enzyme-catalyzed lubrication, enables the composite leather to possess excellent wear resistance, long-lasting antibacterial properties, high breathability, and good softness, making it suitable for wearable devices such as electronic skin and showing promising application prospects.

The present invention relates to a method for producing a vegetable ester oil, comprising a step of producing a vegetable ester oil by transesterifying a vegetable oil with an alcohol in the presence of a catalyst. The vegetable ester oil produced according to the method may exhibit antioxidant effects, anti-inflammatory effects, and skin-whitening effects.

The invention relates to the field of carbonate polymerization, and discloses isosorbide polycarbonate and a preparation method thereof. The preparation method of the isosorbide polycarbonate comprises the following steps: under the action of a ketonic acid metal salt catalyst, taking a dihydroxy compound, diester carbonate and aliphatic dihydric alcohol as raw materials, and carrying out transesterification and polycondensation reaction to obtain the isosorbide polycarbonate. The keto acid metal salt is used as the catalyst for synthesizing the isosorbide polycarbonate, the catalyst is low in price and not prone to inactivation, and the isosorbide polycarbonate with high molecular weight and ideal transparency is catalytically synthesized.

The present invention provides a method for producing a transesterified oil and fat rich in diacylglycerol with less by-products without changing the glyceride composition of the reaction oil. The method for producing the transesterified oil and fat is a method in which, after transesterification reaction of oil and fat and glycerol, a treatment for reducing glycerol dissolved in the reaction oil is performed, and then a treatment for bringing the deglycerolized oil into contact with an adsorbent is performed.

This invention belongs to the technical field of phenolic / glass fiber composite materials, specifically relating to a flame-retardant phenolic / glass fiber composite board, its preparation method, and its application. The flame-retardant phenolic / glass fiber composite board comprises 60-70 wt% glass fiber cloth and 30-40 wt% resin composition cured on the glass fiber cloth. The resin composition consists of the following raw materials in parts by weight: 90-100 parts modified phenolic resin, 5-10 parts epoxy resin, 1-2 parts multifunctional epoxy compound, 1-3 parts toughening agent, and diluent. The amount of diluent is such that the viscosity of the resin composition at 25°C is 150-400 mPa·s. The modified phenolic resin is prepared by reacting phenol, modified phenol, and formaldehyde under the action of an alkaline catalyst. The modified phenol is prepared by transesterification of phenolic alkyl alcohol compounds with phosphonate monocarboxylic acid alkyl esters. The flame-retardant phenolic / glass fiber composite panel of the present invention meets the flame-retardant performance requirements of Part 1 of Appendix F of CCAR-25, which specifies cabin interior facilities or cargo and baggage compartments, without the need for additional flame retardants.

The present invention relates to a novel method for recycling polyethylene terephthalate (PET) using a glycolysis process. This method comprises depolymerising the PET via a transesterification reaction using ethylene glycol (EG) and specific catalysts. The method comprises subsequently synthesising an unsaturated polyester (UPE) from the glycolysis products and mixing the UPE with styrene, which produces an unsaturated polyester resin (UPER). Lastly, the UPER is chemically crosslinked, thereby obtaining a thermosetting material with mechanical properties comparable to commercial resins, which is suitable for use in the chemical polymer industry.

This application relates to the field of plasticizer removal technology, specifically a method for removing plasticizers from natural vitamin E, comprising the following steps: mixing natural vitamin E, an acidic catalyst, and methanol, maintaining a temperature of 100-200℃ and a pressure of 0.4-0.6MPa for a transesterification reaction for 1-3 hours, washing with deionized water 2-5 times to obtain a reaction solution; distilling the reaction solution to obtain plasticizer-free vitamin E; wherein the weight ratio of natural vitamin E, acidic catalyst, and methanol is 100:(1-4):(25-30); the transesterification reaction is carried out under a protective atmosphere; before mixing in step (1), a desiccant is added and / or dehydration under reduced pressure is performed to dry the natural vitamin E; the acidic catalyst is a mixture of sulfuric acid and benzenesulfonic acid. This application, through the combination of raw materials and reaction conditions, removes plasticizers from natural vitamin E without destroying vitamin E, thereby increasing the yield of natural vitamin E while reducing production costs, making it suitable for industrial production.

Through a transesterification reaction in which a predetermined amount of bis(2-hydroxyethyl)terephthalate relative to glycol is fed in a divided or continuous manner, bis(glycol)terephthalate with a low residual amount of an ethylene glycol derivative is prepared, and polyester engineering products or biodegradable polyester products with high crystallinity can be produced therefrom.

The application discloses a kind of waste lithium ion battery electrolyte efficient recovery method, waste lithium ion battery is broken, and the electrolyte is obtained with broken material, the broken material is washed in salt solution, after washing, solid-liquid separation is obtained with filtrate, the filtrate is stratified, and water phase and organic phase are obtained, organic phase is mixed with methanol, under the condition that temperature is 60-100 DEG C, vacuum degree is 10-80kPa, dimethyl carbonate crude product is distilled out.The application utilizes salt solution washing, and the solute that does not react with electrolyte is dissolved in salt solution, so that the density of water phase is larger, electrolyte can be stratified with water phase and float on water phase, realize electrolyte and water stratification, part of metal cation in part of salt enters organic phase during salt solution washing process, under the catalysis of metal cation, ester exchange reaction occurs between carbonate and methanol to generate dimethyl carbonate, temperature control is steamed out dimethyl carbonate crude product, and the purity of distillated carbonate product is high, which can be sold on market.

This application provides a method for preparing methylcarboxylic acid-2-propynyl ester, comprising the following steps: (1) mixing dimethyl carbonate and propargyl alcohol, adding a first alkaline catalyst, stirring and heating to a temperature of 90-105°C, and distilling out methanol by reactive distillation to obtain a first component; (2) performing solid-liquid separation on the first component to obtain a first liquid, and performing vacuum distillation on the first liquid to remove propargyl alcohol and dimethyl carbonate to obtain methylcarboxylic acid-2-propynyl ester and residue; (3) performing vacuum distillation on the residue, replenishing dimethyl carbonate and the second alkaline catalyst with the distillate for reaction, and reusing the reaction liquid in step (2). This application uses the transesterification reaction of propargyl alcohol and dimethyl carbonate to synthesize methylcarboxylic acid-2-propynyl ester, which has high safety, low overall reaction temperature, fewer by-products and waste, and high yield.

This invention discloses a method for preparing dioctyl terephthalate (DOTP) from polyethylene terephthalate (PET), comprising: crushing, washing, and drying waste PET to obtain PET particles; depolymerizing the obtained PET particles in the presence of ethylene glycol and a composite depolymerization catalyst to obtain a depolymerization product; adding the obtained depolymerization product to octanol and a transesterification catalyst for transesterification reaction; after the reaction is completed, post-treatment yields dioctyl terephthalate; wherein the composite depolymerization catalyst is a mixture of zinc oxide and germanium dioxide; and the transesterification catalyst is a supported solid acid catalyst. This invention features high raw material utilization and good environmental performance, using waste PET as raw material to prepare DOTP via transesterification reaction, thus solving the pollution problem of waste PET; simultaneously, ethylene glycol, octanol, and the catalyst can be recycled during the reaction, reducing raw material consumption and wastewater.

The present application relates to the technical field of recovery of methyl acetate and methanol, and discloses a method for removing vinyl acetate in vinyl alcoholysis of ethylene-vinyl acetate, which comprises the following steps: in the preparation of polyethylene-vinyl acetate resin, the mixed solution of crude methyl acetate and first vinyl acetate generated by alcoholysis is subjected to an ester exchange reaction through an alkaline anion exchange resin to remove part of the vinyl acetate; wherein the crude methyl acetate comprises a mixed solution containing methyl acetate, first acetaldehyde and methanol, and the alkaline anion exchange resin is a weak alkaline styrene. The method can reduce the content of vinyl acetate in the crude methyl acetate, which is crucial for improving the subsequent recovery of methanol and product quality.

This invention belongs to the field of polymer material recycling and polyurethane synthesis technology, and relates to a recycled polycarbonate polyol, its preparation method, and its application. The method includes: depolymerizing waste polyethylene terephthalate with dimethyl carbonate, adding methanol for transesterification and separating unreacted methanol, and then undergoing transesterification, separation of unreacted dimethyl carbonate, and polycondensation to obtain the recycled polycarbonate polyol. This polyol contains polyester and polycarbonate segments and is prepared by the above method. The polyol can be reacted with diisocyanate, substance X, and catalyst IV to prepare recycled polyurethane materials, where substance X is a small molecule chain extender; or, substance X is a mixture of a small molecule chain extender and water. This invention achieves a short-process upgrade and recycling of waste polyethylene terephthalate, reducing costs, and the obtained product can be directly used in polyurethane synthesis, combining environmental and economic benefits.

This invention discloses a combined process for the pretreatment of polyester waste and the preparation of dioctyl terephthalate in the field of polymer chemical recycling and resource recycling. The process utilizes specially formulated layered molybdenum-titanium bimetallic phosphate nanosheets with intercalation catalysis as a catalyst. The crushed polyester waste is mixed with isooctanol and pretreated at a lower temperature, followed by a catalytic alcoholysis and transesterification reaction. Ethylene glycol is continuously removed by fractional distillation to drive the reaction to completion. After the reaction, the mixture is cooled and filtered to separate the regenerable solid catalyst. The filtrate is then neutralized, washed with water, and subjected to two-step vacuum distillation. This process achieves a high degree of synergy between the catalyst and the reaction steps, simplifying the traditional multi-step complex process into four core steps. It has the advantages of mild reaction conditions, simple and efficient process, recyclable catalyst, and high product purity, providing a novel and practical technical solution for the high-value resource utilization of polyester waste.

The present application belongs to the field of waste lithium battery recycling, and particularly relates to a kind of ester exchange directional conversion recovery method based on waste lithium battery electrolyte condensate.The present application will be condensed liquid deacidification, through ester exchange reaction, will be directional conversion into carbonic acid dialkyl ester, corresponding dihydric alcohol and monohydric alcohol in it cyclic carbonate and chain carbonate, and through rectification process realizes the efficient separation and purification of each product.The present application uses heterogeneous solid base as ester exchange directional conversion catalyst, has the advantages of easy separation, can be recycled, and does not produce waste lye.Meanwhile, in the reaction process, the product is evaporated in time by azeotropic rectification process, promotes the ester exchange reaction to proceed in the positive direction, significantly improves the yield of carbonic acid dialkyl ester, so as to realize the green and efficient recovery of waste electrolyte condensate, has remarkable economic benefits and resource utilization rate.

The present application relates to the technical field of biodiesel synthesis, and particularly relates to a molybdenum trioxide loaded reduced graphene oxide catalyst and a preparation method and application thereof, the preparation method comprising the following steps: mixing graphite powder, concentrated sulfuric acid and potassium permanganate to perform oxidation treatment, adding hydrogen peroxide to continue the reaction after the reaction is completed, and performing calcination on the graphene oxide product under the protection of a nitrogen atmosphere to obtain reduced graphene oxide; ammonium molybdate is calcined in a muffle furnace to obtain molybdenum trioxide, the obtained molybdenum trioxide and the reduced graphene oxide are compounded through a coprecipitation method, and are subjected to ultrasonic dispersion, stirring and mixing and drying treatment to obtain the molybdenum trioxide loaded reduced graphene oxide catalyst. The catalyst prepared by the present application is a solid catalyst, can be used for catalyzing the transesterification reaction of waste soybean oil to synthesize biodiesel, has no equipment corrosion, the product is easy to separate, the process is environmentally friendly, can be recycled, has a lower cost, and has a good industrial application prospect.

This invention belongs to the field of polymer materials, specifically relating to a method for preparing polycarbonate using a non-phosgene melt transesterification method, and the resulting polycarbonate. The invention involves mixing bisphenol A and diphenyl carbonate at an optimized molar ratio, followed by a transesterification reaction to obtain oligomers. The oligomers are then subjected to a pre-condensation reaction under optimized temperature and pressure, with the residence time controlled to achieve an ideal intrinsic viscosity window. The prepolymer is then subjected to a first and final condensation reaction sequentially to obtain polycarbonate. This invention, through the coordinated control of temperature, pressure, and feed molar ratio during the pre-condensation stage, stabilizes the intrinsic viscosity of the prepolymer within the ideal window, laying a high-quality feed foundation for subsequent condensation polymerization. This significantly improves the impact strength and performance stability of the product, while effectively reducing diphenyl carbonate loss and controlling the end-hydroxyl content of the product. This provides a complete method for the preparation of high-performance polycarbonate.

This invention discloses a composite foam material filled with biocrystal powder, its preparation method, and its application in a sleep-aid pillow, belonging to the field of functional filler technology and patent classification number C08K3 / 34. The method includes first depositing polyphosphate ammonium onto the surface of melamine-formaldehyde prepolymer and acidified expandable graphite, followed by curing to obtain an intumescent flame retardant; synthesizing a castor oil-based flexible segment prepolymer via transesterification; and modifying aluminosilicate fibers with a silane coupling agent. The polyol, flexible prepolymer, biocrystal powder, flame retardant, modified fibers, catalyst, etc., are mixed and foamed with polyisocyanate to obtain the composite material. This invention achieves high-efficiency flame retardancy through the synergistic effect of the flame retardant's microscopic carbon source-acid source-gas source; the castor oil-based flexible segments impart high resilience and sustained compression recovery to the material; and the biocrystal powder helps improve sleep quality, thus combining flame retardancy, high resilience, and sleep-aiding functions.

This invention belongs to the field of stationery technology, and relates to an oil-based iridescent pen refill, its preparation method, and its application. The raw materials of the oil-based iridescent pen refill include specific proportions of composite wax, clay, pigment, plant wax, and adhesive. The composite wax is obtained by hydrogenating soybean wax to produce hydrogenated soybean wax, and then performing an ester exchange reaction between the obtained hydrogenated soybean wax and rice bran wax. By introducing the above-mentioned specific composite wax and plant wax, the compatibility and thixotropy of the system are effectively improved. This allows the pen refill to maintain a high softening point while possessing smoothness due to instantaneous rheological changes under pressure. It also achieves non-bleeding at high temperatures and has excellent folding resistance, bright color rendering, and strong adhesion. At the same time, the raw materials used are renewable, biodegradable, odorless, low in VOC, safe, and non-toxic during production and use.

The utility model discloses a kind of transesterification reaction kettles, including reaction kettle, feed end, discharge end, feed end is set to reaction kettle top, for conveying raw materials to reaction kettle;Discharge end is set to reaction kettle bottom, for finished product discharge;Reaction kettle bottom is equipped with first filter plate, for filtering enzyme in reaction kettle, the discharge port of first filter plate is connected to discharge end by first discharge pipe, reaction kettle is equipped with several vertically arranged second filter plates, the discharge port of second filter plate is connected to discharge end by second discharge pipe, the utility model has the advantages that, structure is reasonable, it is easy to operate, especially suitable for EPA / DHA in fish oil Enzymatic transesterification, especially suitable for high value-added nutritional oil preparation field, in improving product quality, reduce operating cost, prolong the service life of enzyme etc. It has remarkable industrial application value of industrialization.

This invention discloses a flotation agent, its preparation method, and its application in treating produced water from deepwater oil and gas fields, belonging to the field of wastewater treatment technology. The preparation method of this flotation agent includes the following steps: First, using polyether diamine and methyl acrylate as main raw materials, an addition reaction-transesterification reaction is iterated to obtain a branched intermediate product with eight ester groups on the periphery. Then, a transesterification reaction between the polyether monoamine and the intermediate product yields a branched polyether amide-amine, which serves as the flotation agent. The flotation agent of this invention exhibits excellent oil removal effects from deepwater oil and gas field produced water.

The utility model relates to the technical field of chemical equipment, concretely relates to a kind of transesterification reaction device for maleic acid trimebutine production, including foundation, the top middle of the foundation is provided with reaction mechanism, the top outside of the foundation is provided with control mechanism, the reaction mechanism includes placing rack, the bottom of the placing rack is fixedly connected in the top middle of the foundation, the top of the placing rack is fixedly connected with reaction kettle, the top of the reaction kettle is threadedly connected with kettle cover, the top of the kettle cover is fixedly connected with speed regulating motor, the output of the speed regulating motor is fixedly connected with stirrer;The utility model, by the power output of speed regulating motor, drive stirrer to rotate in reaction kettle, promote reactant to mix fully, to realize the omnidirectional mixing of reactant in reaction kettle and the sustained disturbance of bottom material, both promote the mass transfer heat transfer efficiency between material, also avoid the problem of insufficient reaction caused by bottom material deposition.

This invention relates to the chemical industry, specifically to a transesterification reaction system and a method for co-producing battery-grade methyl ethyl carbonate and diethyl carbonate. The system includes: a raw material vaporization unit, an adiabatic reaction unit, and an alcohol-ester separation unit connected in series along the material flow direction; and a purification unit, the inlet of which is connected to the ester-containing stream outlet of the alcohol-ester separation unit via a pipeline. The technical solution of this invention, by employing a gas-solid phase reaction within an adiabatic reactor, improves the reaction rate and reactor production capacity, reduces energy consumption, extends catalyst lifespan, simplifies the process flow, and reduces production costs while ensuring product purity.