236 results about "Valerolactone" patented technology

The present invention provides a polyester heat-shrinkable film containing recycled materials and a preparation method thereof, belonging to the technical field of polymer synthetic films. The raw materials of the polyester heat-shrinkable film include recycled PET polyester particles, PET polyester chips, and a modified masterbatch; the modified masterbatch is prepared from polyethylene terephthalate-1,4-cyclohexanedimethanol ester, triphenyl phosphite, polyethylene glycol block copolymer, nano-silica, and hyperbranched polyester amine; the polyethylene glycol block copolymer is prepared from polyethylene glycol and γ-valerolactone under the action of a catalyst; the hyperbranched polyester amine is prepared from trimethylolpropane, methyl crotonate, and diethylenetriamine. The product of the present invention has excellent properties such as excellent unidirectional anti-shrinkage performance and low haze.

The invention relates to the field of water-based environment-friendly ink, and discloses water-based environment-friendly mutual exclusion ink which comprises the following components: water-based polyurethane-acrylic hybrid resin; a nanocellulose crystal; modifying the plant polyphenol pigment; and gamma-valerolactone; a polyglycerol ester surfactant; a pH response type microcapsule; the invention further provides a preparation method of the water-based environment-friendly mutual-exclusion ink. The preparation method comprises the following steps: S1, preparing the nanocellulose crystal; s2, plant polyphenol pigment modification; s3, preparing a pH response type microcapsule; s4, synthesizing waterborne polyurethane-acrylic acid hybrid resin; and S5, constructing an ink system. According to the invention, a dynamic crosslinking technology of the waterborne polyurethane-acrylic hybrid resin is adopted, so that the flexibility and durability of the ink after coating are remarkably improved, the ink has better recovery capability and stronger mechanical properties, breakage or falling of the ink under stress is avoided, and the service life of the ink is prolonged.

The invention discloses a perovskite precursor solution, a perovskite solar cell and a preparation method of the perovskite solar cell. The perovskite precursor solution provided by the invention contains a perovskite precursor solute, a perovskite precursor solvent and an additive, the perovskite precursor solute contains lead halide, and further contains at least one of tin halide, formamidine halide, methylamine halide, cesium halide, dimethylamine halide and guanidine halide; the perovskite precursor solvent contains at least one of N, N-dimethyl formamide, dimethyl sulfoxide, N-methyl pyrrolidone, 2-methoxyethanol, valerolactone and acetonitrile, and the perovskite precursor solvent contains at least one of N, N-dimethyl formamide, dimethyl sulfoxide, N-methyl pyrrolidone, 2-methoxyethanol, valerolactone and acetonitrile; the additive contains an organic salt of trifluoromethyl acid. The opening voltage loss is reduced, the filling factor and the photoelectric conversion efficiency of the battery are improved, the precipitation of lead iodide is reduced in the crystallization annealing process, the volatilization of organic cations is inhibited, the non-uniform crystallization is improved, and the stability of the battery is improved.

The invention relates to the technical field of petrochemical engineering, in particular to a deep cracking and regeneration purification method of waste lubricating oil. The invention discloses a deep cracking and regeneration purification method of waste lubricating oil, which comprises the following steps: firstly, carrying out magnetic filtration on the waste lubricating oil to separate iron-based impurities, carrying out vacuum dehydration, adsorbing acidic substances by using modified diatomite and the like; secondly, cracking with a magnetic catalyst in a magnetically stabilized fluidized bed; then, carrying out counter-current extraction by using a gamma-valerolactone solution after magnetic separation; and finally, carrying out vacuum fractionation to obtain regenerated base oil. According to the method, impurities are thoroughly removed, the catalyst can be recycled, the solvent is easy to recover, solid waste can be utilized in a high-valued manner, and the yield of the base oil is high.

The invention discloses a method for preparing 1, 3-butadiene, and the method comprises the following steps: enabling a raw material containing gamma-valerolactone to be in contact and react with a catalyst to obtain the 1, 3-butadiene, the catalyst is a hydrogen type molecular sieve with a ten-membered ring topological structure, and the typical topological structure types of the catalyst comprise FER, TON, MTT, EUO, * MRE, MEL and MWW. In a fixed bed reactor, gamma-valerolactone is taken as a raw material and passes through the reactor from top to bottom. The target product 1, 3-butadiene can be efficiently prepared under the condition of 300-450 DEG C by using the catalyst.

The application belongs to the technical field of deep eutectic solvents, and particularly relates to a ternary deep eutectic solvent and preparation and application thereof. The ternary deep eutectic solvent is composed of choline chloride, 5-sulfosalicylic acid and gamma valerolactone according to a molar ratio of 1:4:(3-25). The strong hydrogen bond network structure between the green solvent system first destroys the ester bond between lignin and hemicellulose, then cuts off the beta-O-4 bond between lignin molecules, so as to separate lignin. Meanwhile, the deep eutectic solvent can improve the stability of carbon cations due to the conjugation effect between the lone pair electrons on the heteroatom oxygen and the central carbon in the molecular structure of gamma valerolactone, so as to inhibit the condensation reaction of lignin.

A first aspect of the invention relates to a process for recycling of a colored polymeric material, wherein the colored polymeric material comprises (i) a polyalkylene terephthalate based polymer, (ii) a colorant and optionally (iii) a second polymer different from the polyalkylene terephthalate based polymer of (i) and optionally (iv) a third polymer different from the polyalkylene terephthalate based polymer of (i) and different from the second polymer of (iii), the process comprising (a) providing a colored polymeric material and a solvent system comprising gamma valerolactone (GVL); (b) contacting the colored polymeric material provided in (a) with the solvent system comprising GVL provided in (a) under conditions allowing for colorant removal but not allowing for dissolution of the polyalkylene terephthalate based polymer, thereby obtaining a solvent system, which is enriched in colorant compared to the solvent system provided, and a polymeric material, which is depleted in colorant compared to the colored polymeric material provided in (a); (c) depolymerisation or transesterification of the polymeric material, which is depleted in colorant obtained in (b); thereby obtaining monomers and / or oligomers or transesterification products. In a second aspect, the invention relates to a monomer, oligomer or transesterification product of a polyalkylene terephthalate based polymer obtained or obtainable by the process of the first aspect. A third aspect relates to a process comprising converting, preferably polymerizing, the monomers, oligomers or transesterification products of a polyalkylene terephthalate based polymer obtained from the process of the first aspect to obtain one or more polymer or polymer product. A fourth aspect relates to a process comprising converting the separated second polymer (iii) and / or the separated third polymer (iv) obtainable by or obtained from the process of the first aspect to obtain one or more monomer, polymer or polymer product.

The invention discloses a dual stimuli-responsive polymer micelle as well as a preparation method and application thereof. The micelle is jointly formed by a phenylboronic acid modified polyethylene glycol monomethyl ether-(alpha-propargyl-delta-valerolactone-lactide) copolymer and a catechol modified polyethylene glycol monomethyl ether-(alpha-propargyl-delta-valerolactone-lactide) copolymer, wherein the phenylboronic acid modified polyethylene glycol monomethyl ether-(alpha-propargyl-delta-valerolactone-lactide) copolymer is used for modifying the phenylboronic acid; when the micelle is formed, pH and ROS can be formed in a hydrophobic core to stimulate corresponding boric acid ester bonds; the micelle is used for loading hydrophobic antitumor drugs. The polymer micelle prepared by the invention can be stable in an in-vivo circulating physiological environment, and makes stimulation response to a tumor microenvironment to cause structure loosening or dissociation, so that effective delivery of hydrophobic antitumor drugs is realized, the problems of instability of the micelle in vivo and drug pre-leakage are effectively solved, and the drug delivery efficiency is improved. Theoretical and practical basis is provided for promoting cancer treatment of a polymer micelle drug delivery system.

The invention relates to the field of chemical synthesis, in particular to a preparation method of chlorinated alkyl polyphosphate, which comprises the following steps: mixing diethylene glycol and gamma-valerolactone, slowly adding phosphorus oxychloride, and reacting at 20-50 DEG C to generate a reaction solution containing an intermediate; adding gamma-valerolactone and an IL (at) MOFs-P catalyst into the reaction solution, slowly adding epoxypropane, and reacting at 130-150 DEG C in a nitrogen atmosphere to generate a target product mixed solution; and recovering gamma-valerolactone through distillation, centrifugally separating the catalyst, regenerating and recycling, and purifying a crude product to obtain a final product. The green solvent gamma-valerolactone is adopted and recycled, the IL-coated MOFs-P catalyst is high in activity and can be recycled, side reactions are reduced by accurately controlling reaction conditions, the product yield reaches 90% or above, the purity exceeds 98%, and the method has the advantages of being green, environmentally friendly, economical and efficient.

Disclosed herein are methods, compositions, and reactor systems for producing difructose anhydride. The method comprises contacting a solution comprising fructose and gamma valerolactone with an acidic catalyst at an effective temperature for an effective contact time to produce difructose anhydride.

The invention belongs to the field of photovoltaic module recovery, and discloses a method for treating an EVA (Ethylene Vinyl Acetate) adhesive film of a decommissioned photovoltaic module by a low-temperature chemical method. The method comprises the following steps of: disassembling the decommissioned photovoltaic module and cutting the decommissioned photovoltaic module into small samples; pretreating the sample; and putting the pretreated sample into a mixed solution of gamma-valerolactone, D-limonene, polyethylene glycol, absolute ethyl alcohol, 2-methylimidazole and polydimethylsiloxane, and soaking at low temperature, so that the EVA adhesive film is swelled, the adhesive force between the EVA adhesive film and the battery piece is reduced, and the separation of the EVA adhesive film and the battery piece is realized. Treatment can be carried out at low temperature, energy consumption is remarkably reduced, and the environment-friendly requirement is met; the operation process is simple, and the treatment period is short.

A brain function improving agent prevents the onset of, treats, and / or ameliorates cognitive function impairment and depressive symptoms in central nervous system diseases. The agent contains as active ingredient, at least one among 5-(3,5-dihydroxyphenyl)-γ-valerolactone represented by formula (I), a salt of said compound, and a conjugate of said compound.

In a first aspect, the invention relates to a process for discoloration of a colored polymeric material comprising: (i) providing a colored polymeric material and providing a solvent comprising gamma-valerolactone: (ii) contacting the colored polymeric material with a solvent comprising gamma-valerolactone at a temperature in the range of from 40 to 170° C. thereby obtaining a solvent, which is enriched in colorant compared to the solvent provided in (i), and a polymeric material, which is depleted in colorant compared to the colored polymeric material provided in (i). A second aspect of the invention is related to a polymeric material, which is depleted in colorant obtained or obtainable from the process of the first aspect. In a third aspect, the invention is related to a use of the polymeric material, which is depleted in colorant according to the second aspect for textile applications, fiber applications, packaging applications or plastic applications. A fourth aspect of the invention is related to a method for preparing a textile or a packaging comprising (a) providing a polymeric material, which is depleted in colorant, preferably a polymeric material, which is depleted in colorant of the second aspect: (b) preparing a textile or a packaging from the polymeric material provided in (a).

The invention relates to use of a polymer (I) as a precursor of a shape-memory polymer, wherein the polymer (I) comprises a backbone which is end-capped by a crosslinkable end-capping unit comprising a moiety having a crosslinkable functionality, wherein the backbone comprises a copolymer of a cyclic carbonate selected from the group consisting of trimethylene carbonate, ethylene carbonate, propylene carbonate, styrene carbonate and glycerol carbonate and a comonomer selected from the group consisting of ε- caprolactone, α-acetolactone, β-propiolactone, γ-butyrolactone, δ- valerolactone, β-butyrolactone, γ-caprolactone, γ-octalactone, γ-nonalactone, δ- decalactone, γ-decalactone, ω-pentadecalactone, diglycolic anhydride, glycolide,lactide, norcamphor lactone, verbanone lactone, dihydrocarvide, wherein the lactone is unsubstituted or substituted by halogen or C1-C12 alkyl, and combinations thereof.

The invention belongs to the technical field of synthesis of organic compounds, and particularly relates to a process for preparing fipronil and an intermediate thereof. Toxic 1, 2-dichloroethane is comprehensively replaced by bio-based gamma-valerolactone, low-toxicity cyclopentyl methyl ether is matched, and N, N-dimethylformamide necessary for the process is recycled, so that consumption is greatly reduced; the continuous processes of amination, diazotization and the like are realized through a tubular reactor, a micro-reactor and a static mixer, and separation technologies such as pervaporation membrane and vacuum distillation are combined, so that the reaction time is shortened, the solvent recovery rate is increased, and the production is promoted to be continuously transformed to green. The supported FeCl3 / SiO2-NH2 catalyst disclosed by the invention can be repeatedly used, and byproducts and tail gas can be recycled and reused. In addition, diazonium salt residues are controlled to be smaller than or equal to 0.5% through near infrared spectroscopy, citric acid is subjected to stable oxidation reaction, a purification process is combined, it is ensured that the finished product is high in purity, excellent in yield and small in batch fluctuation, and efficiency and safety are both considered.

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.

Provided is a resin composition containing a polylactic acid polymer and a β-methyl-δ-valerolactone polymer.

Provided is a dendritic cell activator that contains, as an active ingredient, a component derived from a natural product which has been eaten for many years and the safety of which has been empirically confirmed, and that is used for inducing or promoting an acquired immune response effective against cancer or infectious disease. Specifically provided are: a dendritic cell activator containing, as an active ingredient, 5-(3,5-dihydroxyphenyl)-y-valerolactone represented by formula (I); and a medicine, a supplement, and a food or beverage each containing the compound represented by formula (I) as an active ingredient. [The configuration of the wavy line may be either R-form or S-form.]

The invention relates to a preparation method and application of a catalyst for catalyzing dehydrogenation of 1, 4-pentanediol to prepare gamma-valerolactone, and the catalyst is Cu / PrOx-ZnO. The method comprises the following steps: dissolving soluble salts of copper salt, zinc salt and praseodymium salt in a mixed solution of deionized water and an organic solvent, and ultrasonically dissolving; and then sequentially adding a complexing agent and a structure-directing agent, carrying out ultrasonic dissolution again, transferring into a 100ml high-pressure hydrothermal kettle, aging for 6-72 hours under the condition of 90-180 DEG C, cooling, washing, drying and roasting to obtain the nano-sheet Cu / PrOx-ZnO catalyst with a hierarchical hierarchical pore structure. According to the present invention, with the catalyst, the gamma-valerolactone preparation through the efficient catalytic conversion of the 1, 4-pentanediol in the trickle bed reactor at the temperature of 160-210 DEG C under the solvent-free condition can be achieved, the conversion rate of the 1, 4-pentanediol is greater than 99%, the selectivity of the gamma-valerolactone is greater than 97%, the catalyst has good stability, and the catalytic activity is not significantly reduced after the continuous operation for 200 h. The catalyst provided by the invention has the advantages of hierarchical hierarchical pore nanosheet structure, abundant alkaline sites and defect sites, good active metal dispersity, high activity, easy recovery, high stability and high product yield.

The invention relates to a process for the manufacturing of biobased 3-methyl-delta-valerolactone (3MdVL) and 3-methyl-1,5-pentanediol (3MPD) via one- pot hydrogenation of anhydromevalonolactone (aMVL) in the presence of a Raney- Nickel catalyst. The hydrogenation occurs without solvent at a temperature from 120ºC-180ºC, preferably at 130ºC-170ºC and a pressure between 15-30 bar, preferably at a pressure between 18 and 22 bar. The hydrogenation time may vary between 3 and 25 hours, preferably between 6 and 24 hours.

The present invention provides a method for preparing a highly transparent and highly flexible modified polylactic acid, and relates to the technical field of organic polymer compounds. A method for preparing a highly transparent and highly flexible modified polylactic acid includes the steps of preparing a PLA-co-PVL copolymer solution, purifying the PLA-co-PVL copolymer, synthesizing an ATEC-HEA complex, and obtaining a modified polylactic acid composite material; the preparation of the PLA-co-PVL copolymer solution comprises the steps of uniformly mixing L-lactide and δ-valerolactone to obtain a mixed solution, adding a catalyst and an initiator to the mixed solution, and reacting to obtain a PLA-co-PVL copolymer solution; the catalyst is Sn(Oct)2, and the initiator is 1,4-butanediol; the synthesis of the ATEC-HEA complex comprises raw materials including acetyl citrate triethyl, hydroxyethyl acrylate, p-toluenesulfonic acid, and hydroquinone; the preparation of the modified polylactic acid composite material comprises raw materials including a PLA-co-PVL solid copolymer, an ATEC-HEA complex, and an antioxidant. The modified polylactic acid of the present invention has high light transmittance and excellent flexibility.

The invention relates to the technical field of perovskite solar cells, and particularly discloses perovskite intermediate powder and a method for preparing a perovskite solar cell from the perovskite intermediate powder, and the intermediate powder is prepared by using a ligand and an extraction solvent; the preparation method comprises the following steps: performing crystal growth at room temperature in an extraction solvent diffusion manner to obtain a perovskite intermediate by taking N-formyl morpholine as a ligand and an ether or ester solvent and a mixed solvent thereof as an extraction solvent, and then performing low-temperature drying to obtain perovskite intermediate powder. According to the invention, N-formyl morpholine is selected to replace toxic DMF and DMSO, and a perovskite intermediate is dissolved in green solvents such as ethanol, gamma-valerolactone, 2-pentanol and the like to prepare the perovskite thin film. The prepared intermediate powder has relatively long storage stability, and the storage time of perovskite and the stability of a battery device are improved while the solvent toxicity is solved.

The invention discloses a beta-ketimine type binuclear aluminum complex and a preparation method thereof. The binuclear aluminum complex can be used for catalyzing ring opening polymerization of caprolactone, lactide, glycolide, valerolactone, butyrolactone or ethylene carbonate. The invention further discloses a preparation method and application of the binuclear aluminum complex. The preparation method is simple, the reaction condition is mild, the prepared beta-ketimine type binuclear aluminum complex is used as a catalyst, the catalytic activity is high, the stability is good, the service life is long, the molecular weight distribution of the obtained polymerization product is narrow, and the beta-ketimine type binuclear aluminum complex can be well applied to the ring-opening polymerization reaction of cyclic ester.

The invention discloses a precursor solution preparation method and a perovskite solar cell preparation method. The method comprises the following steps: preparing a perovskite precursor solution by taking dimethyl sulfoxide, 2-methyltetrahydrofuran and gamma-valerolactone as solvents; and adding a perovskite material into the solvent to form a perovskite precursor solution. A full-green solvent system composed of dimethyl sulfoxide, 2-methyltetrahydrofuran and gamma-valerolactone is adopted to prepare a precursor solution, the perovskite solar cell is prepared from the precursor solution, a specific solvent combination is matched with a corresponding coating rate and regulation and control crystallization kinetics, and a uniform and compact high-quality perovskite thin film can be prepared on a large area. The device efficiency is improved.

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.

The invention relates to a process for preparing a levulinic-acid ester or alkyl levulinate, in particular ethyl levulinate, comprising the following steps: - preparing a solution containing furfuryl alcohol, an alcohol as solvent, and hydrochloric acid as catalyst acid, - esterifying this solution at a temperature in the range of 60-100°C to form alkyl levulinate, - neutralizing the catalyst acid in the mixture thus obtained, and - separating the alkyl levulinate from the humins formed as by-products. The invention also relates to a process for preparing gamma-valerolactone (GVL) by hydrogenating the alkyl levulinate obtained or obtainable by the process.

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 invention provides a method for preparing N-methyl-2-piperidone, which comprises the following steps of: mixing delta-valerolactone and methylamine, enabling the delta-valerolactone and methylamine to react at preset temperature and pressure, forming an intermediate product N-methyl amide by ring opening of the delta-valerolactone and methylamine, and dehydrating and cyclizing to form a mixed solution containing N-methyl-2-piperidone; and cooling the mixed solution to room temperature, and then carrying out reduced pressure distillation to obtain a fraction product N-methyl-2-piperidone with the yield of more than 90%. The raw materials are simple and easy to obtain, the reaction is easy to operate, and the application prospect is wide.

A β-methyl-δ-valerolactone copolymer is represented by general formulas (I) or (II).