17 results about "Valerolactone" patented technology

The application discloses a method for preparing gamma-valerolactone by catalyzing acetylpicoline acid hydrogenation with molybdenum selenide, and aims to solve the problems of low catalytic efficiency and harsh reaction conditions of existing non-noble metal catalyst systems. The method comprises the following steps: placing molybdenum selenide catalyst, acetylpicoline acid and a solvent as raw materials in a high-pressure reaction kettle, replacing the air in the high-pressure reaction kettle with hydrogen gas at room temperature for multiple times, then continuously feeding hydrogen gas until the pressure in the high-pressure reaction kettle reaches 0.5-3.0 MPa, magnetically stirring the reaction under the pressure range, at a temperature of 100-200 DEG C and in a hydrogen atmosphere, and then cooling to room temperature, so as to obtain gamma-valerolactone. The catalyst used in the application is prepared under hydrothermal conditions, and due to the sheet morphology of the molybdenum selenide catalyst, rich edge active sites are presented, so that the conversion rate of acetylpicoline acid and the selectivity of gamma-valerolactone can reach 100% under mild reaction conditions.

The application relates to the field of industrial cleaning and film stripping technology, in particular to a magnetic force polishing film stripping agent and a preparation method thereof, which is prepared from the following raw materials in percentage by weight: 10-20% of environment-friendly organic solvent, 1-10% of corrosion inhibitor, 5-15% of surfactant, 5-15% of lubricant, 1-10% of organic additive, 1-5% of chelating agent, and the rest of deionized water; the environment-friendly organic solvent is composed of D-limonene and gamma-valerolactone; by adopting the above formula, the organic film layers such as acrylate and epoxy resin can be quickly softened and peeled off at normal temperature to 50 DEG C, and high temperature or ultrasonic assistance is not needed, so that energy consumption is reduced. The system does not contain strong acid and strong base, the corrosion inhibitor can form effective protection on active metals such as aluminum, magnesium and zinc, and corrosion and surface damage are avoided; the surfactant and the lubricant can synergistically improve wetting and permeability and reduce mechanical scratches; the chelating agent can stabilize metal ions and prevent redeposition; the organic additive can optimize dissolution kinetics. The overall formula is low-toxic and low-volatility, and has high film stripping efficiency and substrate compatibility.

This invention discloses a method for preparing a metal phosphide catalyst. The method involves uniformly mixing a carbon-containing precursor with a phosphorus-containing precursor solution and then drying the mixture to obtain a solid product. The solid product is then pyrolyzed under an inert atmosphere. The pyrolyzed solid product is washed and dried to obtain a phosphorus-doped carbon material. A metal salt solution is then uniformly mixed with the obtained phosphorus-doped carbon material, dried, and reduced under a hydrogen-containing gas atmosphere to obtain the metal phosphide catalyst. Thus, this invention prepares phosphorus-doped porous carbon through the pyrolysis of a carbon precursor and a phosphorus-containing precursor. This utilizes the binding effect of phosphorus functional groups with metal ions to inhibit the migration and aggregation of metal particles under high-temperature conditions, effectively preventing metal particle sintering and improving the yield of the target catalytic product.

The application discloses green cross-linked polyvinyl acetal porous powder and a preparation method and application thereof, and relates to the technical field of polymer materials. The green cross-linked polyvinyl acetal porous powder is prepared by heterogeneous cross-linking reaction of polyvinyl acetal porous powder and a bio-based cross-linking agent in a green solvent, wherein the polyvinyl acetal porous powder is prepared by acetal reaction of polyvinyl alcohol and an aldehyde compound under the action of an acid catalyst. The bio-based cross-linking agent derived from natural oil or sugar is used to replace the traditional chemical synthetic cross-linking agent, and the green solvent system of gamma-valerolactone / ethanol is used to replace the traditional volatile organic solvent, so that VOC emission and the use of toxic substances are avoided from the source, the VOC content is only 12-15 g / L, the green cross-linked polyvinyl acetal porous powder has good environmental friendliness, and meanwhile, has excellent solvent resistance and low-temperature flexibility, and can be widely applied in the fields of flexible electronic packaging materials, green powder coatings, environment-friendly adhesives and the like.

The application belongs to the technical field of biomass catalytic conversion, and specifically discloses a gallium-modified dealuminized H-ZSM-5 catalyst, a preparation method and application thereof, and the method comprises the following steps: ion exchange is performed on Na-ZSM-5 molecular sieve and an ammonium salt solution; selective dealuminization is performed on NH4-ZSM-5 molecular sieve and an ammonium hexafluorosilicate solution; and the impregnation method is used to load a gallium salt solution to the dealuminized molecular sieve carrier DeAl-H-ZSM-5, so as to obtain the gallium-modified dealuminized H-ZSM-5 catalyst. The application adopts the above-mentioned gallium-modified dealuminized H-ZSM-5 catalyst, the preparation method and application thereof, and the method is characterized in that the composite strategy of purifying the base by selectively dealuminizing first and then precisely loading Ga to regulate the acidity is adopted, the prepared catalyst can efficiently catalyze the preparation of furfural from pentose in a γ-valerolactone / water system, and high conversion rate and high selectivity are realized.

A method of forming gamma valerolactone (GVL) includes contacting a mixed feed stream comprising unreacted 3-pentenenitrile (3PN) and water within a first reactor in the presence of a heterogeneous catalyst. The reaction can occur at a temperature range of 100°C to 400°C and under a pressure of 150 pounds per square inch (psi) or less. The method involves separating unreacted 3PN and water from the GVL product, then routing these unreacted components back to the first reactor for further GVL formation.

This invention relates to the field of distillation apparatus technology, specifically to a modular distillation apparatus suitable for the alternating production of γ-butyrolactone and δ-valerolactone. It includes a distillation column with an opening on its side wall. A sealing door is detachably installed at the opening via bolts. A lifting cylinder is installed inside the distillation column. The lifting cylinder contains tray modules, and a lifting mechanism is installed inside the distillation column. A locking mechanism is installed on the inner wall of the distillation column. By using replaceable tray modules and packing modules within the same distillation column, and cooperating with the lifting mechanism, the lifting cylinder can be smoothly raised, lowered, and its position adjusted. The locking mechanism ensures the stability of the module installation. This eliminates the need to construct multiple distillation columns separately; alternating production of GBL and DVL can be achieved simply by switching different functional modules. This solves the problems of high cost and low equipment utilization caused by the "one product, one column" approach mentioned in the background art.

The present application relates to a kind of one-pot two-step catalytic xylose preparation gamma-pentyl lactone method, belong to biomass energy chemical technology field.The present application uses xylose as substrate, in anaerobic environment, using catalyst Hβ-30 catalyzes xylose reaction conversion into furfural, catalyst Hβ-30 catalyst is removed from reaction liquid to obtain furfural crude solution;With furfural crude solution as second reaction substrate solution, cellulose carbon modification Zr / β catalyst and isopropyl alcohol solvent are added into furfural crude solution, in anaerobic environment, catalytic furfural is efficiently converted into gamma-pentyl lactone.The present application can be directly prepared from xylose one-pot two-step method gamma-pentyl lactone, avoid the separation and purification of unstable intermediate product, with the characteristics of high degree of integration of catalytic system, gamma-pentyl lactone yield is high.

This invention relates to the field of lithium battery technology, and more particularly to a preparation process for a lithium battery additive. The process first prepares a Zn-MOF-74 catalyst through dissolution, crystallization, separation, and stepwise vacuum drying. Then, using γ-valerolactone as a solvent, propenyl-1,3-sulfonyl lactone undergoes an addition reaction with 4-aminophenylboronic acid under the action of the catalyst to generate an intermediate. This intermediate then undergoes a substitution reaction with ethyl bromoethyl, followed by recrystallization and vacuum drying to obtain a sulfonate-boron-oxygen heterocyclic synergistic additive. This additive utilizes the synergistic effect of the sulfonate group and the boron-oxygen heterocycle to improve the ionic conductivity of the electrolyte and inhibit its decomposition, significantly improving the room-temperature cycle life, wide-temperature-range discharge performance, and high-temperature storage stability of lithium batteries. The preparation process is controllable, the product has high purity, and it is suitable for various high-performance lithium batteries.

This invention discloses a two-step method for the efficient preparation of furfural from biomass, belonging to the field of high-value utilization technology of biomass. The method involves: first, pretreating lignocellulosic biomass using an organic acid catalyst to obtain a liquid-phase product rich in xylose and a solid-phase product rich in cellulose and lignin; second, in a two-phase system composed of γ-valerolactone, water, and sodium chloride, dehydrating xylose using an organic acid catalyst to obtain furfural; the xylose yield in the liquid-phase product is not less than 55%; the cellulose retention rate in the solid-phase product is not less than 83%, and the lignin retention rate is not less than 81%. This invention significantly improves the quality yield of furfural (up to 43.3%), effectively inhibits sugar condensation and side reactions, and achieves efficient retention of cellulose and lignin, providing a green, efficient, and scalable technical path for the high-value utilization of all components of biomass.

The present application provides a kind of decolorization recycling treatment method of polyethylene terephthalate component product, which is to heat treatment at least 1 hour under the temperature condition of 80-260 DEG C for plastic, polyester fabric or mixed fabric containing polyethylene terephthalate component in decoloring agent, after time reaches, obtain the recycled product after decolorization by removing dye and filtering;The decoloring agent is at least one of gamma-butyrolactone, gamma-valerolactone and delta-valerolactone.The method innovatively applies the decoloring agent with lactone structure to the decolorization of polyethylene terephthalate component product, and the decoloring agent can be recycled and reused, and the key is to control the degradation and morphology of recycled product by controlling the decolorization treatment condition, which lays the foundation for the high-value application of recycled polyethylene terephthalate component product, and is expected to realize industrial application.

The application belongs to the field of fine chemical product preparation, and discloses a method for preparing gamma-valerolactone based on reaction-separation coupling. The method is realized based on a reaction-separation coupling system, and the reaction-separation coupling system comprises a first reactor, a membrane separation system, a second reactor and a rectification system. The specific steps are as follows: furfuryl alcohol is introduced into the first reactor filled with an acid catalyst at a fixed flow rate to complete hydrolysis to generate levulinic acid, the hydrolysis product is dehydrated through a NaA type zeolite membrane separation system, and then is introduced into the second reactor filled with a hydrogenation catalyst to complete a hydrogenation-cyclization reaction in the presence of isopropyl alcohol as a hydrogen donor; the product is separated through the rectification system to obtain high-purity gamma-valerolactone, and the separated water and unreacted raw materials are returned to the first reactor for recycling. The method realizes efficient circulation of materials and improves the preparation efficiency.

This invention discloses a trace element fertilizer using aminated lignin as a carrier and its preparation method. The preparation method includes: dissolving aminated lignin in a mixed solvent of water and γ-valerol to obtain an aminated lignin solution; then adding the aminated lignin solution to an antisolvent to allow it to self-assemble into aminated lignin nanoparticles; dispersing the aminated lignin nanoparticles in an aqueous solution containing trace elements, and obtaining the trace element fertilizer using aminated lignin as a carrier after the reaction. The aminated lignin nanoparticles prepared by this invention have a rough, porous structure and a specific surface area as high as 76.3 m². 2 / g, for Cu 2+ Zn 2+ Mn 2+ The chelation capacities reached 89 mg / g, 50 mg / g, and 60 mg / g, respectively. This method is simple to prepare, environmentally friendly, and can effectively improve the utilization rate of trace elements and reduce environmental pollution, showing promising application prospects in agricultural fertilization.

This invention relates to liquid crystal alignment agents, liquid crystal alignment films, and liquid crystal display elements. The liquid crystal alignment agent of this invention contains the following components (A) to (D), and contains component (C) in an amount of 20 to 50% by mass relative to the total mass of the liquid crystal alignment agent. (A): At least one polymer selected from the group consisting of polyimide precursors and polyimides as imides thereof. (B): A non-amine Si coupling agent. (C): At least one organic solvent selected from the group consisting of γ-butyrolactone, γ-valerolactone, N-ethyl-2-pyrrolidone, N-butyl-2-pyrrolidone, and ethyl carbitol. (D): At least one organic solvent selected from the group consisting of 1-butoxy-2-propanol, 2-butoxy-1-propanol, butyl cellosolve, butyl cellosolve acetate, and dipropylene glycol dimethyl ether.

A method for preparing a rare-earth-containing heterojunction catalyst material CeO2 / Sm-MOF involves dissolving samarium nitrate hexahydrate and H4TBAPy in a composite solvent to form a mixed solution, followed by hydrothermal reaction to obtain Sm-MOF. Cerium ammonium nitrate and Sm-MOF are then dissolved in an aqueous solution of γ-valerolactone, followed by the addition of H2O2 and triethanolamine to form a mixed solution. The mixture is magnetically stirred at 45-55°C for 2-3 hours, followed by hydrothermal reaction and calcination. This invention improves the thermal stability of Sm-MOF by using cerium ammonium nitrate as the Ce source and combining a two-step heat treatment process. This effectively enhances the bonding force and distribution uniformity of CeO2 on the Sm-MOF surface, improving the catalytic activity and cycle stability of CeO2 / Sm-MOF. It exhibits excellent degradation efficiency for MB, RhB, ATZ, CIP, etc., and demonstrates excellent cycle stability during cycling.