283 results about "Valerolactone" patented technology

Desirable electrolyte compositions are described that are suitable for high voltage lithium ion batteries with a rated charge voltage at least about 4.45 volts. The electrolyte compositions can comprise ethylene carbonate and solvent composition selected from the group consisting of dimethyl carbonate, methyl ethyl carbonate, γ-butyrolactone, γ-valerolactone or a combination thereof. The electrolyte can further comprise a stabilization additive. The electrolytes can be effectively used with lithium rich positive electrode active materials.

Packaging laminate for packages for liquid foods having excellent liquid and oxygen gas barrier properties in which all included layers are biodegradable. The packaging laminate includes at least one liquidtight layer (11, 13) of homo or copolymers of monomers selected from a group consisting of lactic acid, glycol acid, lactide, glycolide, hydroxy butyric acid, hydroxy valeric acid, hydroxy caproic acid, valerolactone, butyrolactone and caprolactone, as well as an oxygen gas barrier layer (12) of ethylene vinyl alcohol, polyvinyl alcohol, starch or starch derivatives. The oxygen gas barrier layer is preferably applied by a dispersion coating process. The layers may be laminated directly to one another or indirectly by means of interjacent adhesive layers. The packaging laminate may also include a core layer of, for example, paper or paperboard, or a biopolymer. The invention also realises a method of producing the biodegradable packaging laminate according to the invention.

A biodegradable antithrombotic conjugate having heparin and other anti-thrombotic moieties are introduced as side chains to the polymer backbone modified by click chemistry. Various bioabsorbable monomers and dimers such as valerolactone may be used in the monomer derivation, homo- and co-polymerization, and the conjugation with a biologically active molecule by click chemistry. A coating comprising a biocompatible and bioabsorbable polymer anti-thrombotic conjugate is applied to at least a portion of an implantable device to prevent or reduce the formation of thrombosis on the surface of the implantable device. A first or sub-layer of the coating is prepared by mixing a polymeric material and a biologically active agent with a solvent, thereby forming a homogeneous solution. A second or outer layer comprising the present anti-thrombotic conjugate may be applied over the inner drug-containing layers using, for example, a dip coating or spray coating process.

The invention discloses a method for preparing GAMMA-valerolactone from levulinic acid and formic acid, which is characterized in that the levulinic acid is in situ reduced at 100-200 DEG C in the presence of ruthenium catalyst and formic acid contained in a system as reducer, and distillation is carried out to obtain mixture containing the product GAMMA valerolactone and used catalyst; and mother liquor containing the used catalyst and raw material are mixed to realize circulation of the catalyst, thereby greatly improving environmental friendliness. The method avoids the energy source consumption during valerolactone purification process, avoids hydrogen source acquired from the system exterior, and improves the economy and security of a production system, with the advantages of simple operation process. The formic acid is decomposed to generate large amount of carbon dioxide besides hydrogen, which is convenient for collection and utilization.

The present invention relates to the of amine imine zinc catalyst and the preparation method as well as the application of the amine imine zinc catalyst, which belongs to the macromolecule technology field. The amine imine zinc catalyst is (2-2, 6-isopropyl benzeneimino methyl phenyl)-2. 6-diisopropyl amino ethyl benzene Zinc, (2-2,6-diisopropyl pheny benzeneimino methyl phenyl) ethylenediamine-diethyl zinc and so on. The amine imine zinc catalyst is used for catalysis lactones and virgule or lactide for homopolymerization and random as well as block polymerization; the cyclolactone compound is glycolide, lactide, beta-butyrolactone, beta- valerolactone or Epsilon -caprolactone. The catalyst of the present invention is of varied structure. Through the change of the substituent on the ligand and the central metal, the performance of the catalyst can be substantially controlled. The catalyst of the present invention is of good stability, high catalytic activity. The polymerization reaction can occur at a lower temperature to gat macromolecule polymer; through the control over the polymerization condition, the molecular weight of the polymer can be controlled.

The invention provides a green separating process for components of lignocellulose, which belongs to the fields of high-value utilization of biomass resources and biochemical industry. According to the process, biomass is pretreated with irradiation and then coupled with low-boiling-point tetrahydrofuran or high-boiling-point gamma-valerolactone for a reaction, and primary filtering is carried out so as to obtain a cellulose component; tetrahydrofuran is recovered from obtained filtrate or a saturated NaCl solution is added into the filtrate for phase-split precipitation of lignin; and secondary filtering is carried out, the obtained residue is a lignin component, and secondary filtrate is dried so as to obtain a hemicellulose component. The process has the advantages that no organic solvent like acid, alkali and alcohol is needed for separation of the components of lignocellulose and the process is simple, highly efficient and clean.

A method to produce levulinic acid (LA) and γ-valerolactone (GVL) from biomass-derived cellulose by selective extraction of LA by alkylphenol (AP) and hydrogenation of LA, in which mineral acid used in the method is recycled and the final concentration of GVL is increased by successive extraction/hydrogenation steps to allow for effective separation by distillation.

An industrially viable process for selective preparation of γ-valerolactone using recyclable non noble metal catalyst is provided. This process provides 80-100% conversion to γ-valerolactone, with selectivity in the range of 80-100%.

Process for the production of γ-methyl-α-methylene-γ-butyrolactone from reaction of levulinic acid and hydrogen with recycle of unreacted levulinic acid and reaction of crude γ-valerolactone and formaldehyde, both reactions being carried out in the supercritical or near-critical fluid phase.

The invention discloses delta-valerolactone compounds having structures expressed by a general formula (I); the invention further discloses a preparation method of the compounds, polyester prepared from the compounds and a preparation method thereof; the raw materials of the delta-valerolactone compounds prepared by the invention are extensive and renewable; and the polyester prepared from the delta-valerolactone compounds has biocompatibility and degradable hydrophily and can be utilized in a plurality of purposes, for example, medicine conveyance, protein protection, and the like.

Provided are a metal microparticle dispersion which is excellent in a dispersibility, an electrically conductive substrate which is obtained by using the above metal microparticle dispersion and which is excellent in an electrical conductivity and a production process for the same.

Provided is a metal microparticle dispersion comprising metal microparticles, a polymeric dispersant and a dispersion medium, wherein an average primary particle diameter of the metal microparticles is 0.001 to 0.5 μm; the polymeric dispersant has a polyester skeleton in at least one of a principal chain and a side chain thereof; the above polyester skeleton has at least one of a constitutional unit derived from valerolactone and a constitutional unit derived from caprolactone, and a sum of the numbers of the above constitutional units is 10 or more in terms of an average value, or the polymeric dispersant has a polyether skeleton in at least one of a principal chain and a side chain thereof; and a content of the above polymeric dispersant is 0.1 to 100 parts by mass based on a content of 100 parts by mass of the metal microparticles. Further, provided is a production process for an electrically conductive substrate, comprising printing a coating solution containing the above metal microparticle dispersion in a pattern-like form to form a printed layer and subjecting the above printed layer to burning treatment to form a pattern-like metal microparticle sintered film, and an electrically conductive substrate produced by the above production process is provided as well.

The invention relates to a super-capacitor high-temperature electrolyte. Wherein, its solute is N-trialkyl-N-alkoxy acyl fluoroboric acid or phosphorofluoric acid or Fraude's reagent, or trifluoromethyl sulfonic acid; and the solvent is aprotic solvents; its density in room temperature is 0.8-2.0mol/l; the aprotic solvents are acetonitrile, ethyl cyanide, methacrylonitrile, gamma- butyrolactone, gamma- valerolactone, vinylene carbonate, propylene carbonate, N, N- dimethyl formamide, 1- dimethyl formamide-2- pyrrolidone, methylenedioxy ethane, 2-methoxy ether, tetrahydrofuran, dioxolane, dimethyl carbonate, diethyl carbonate, diethyl carbonate, or dimethyl sulfoxide. And the inventive capacitor has high capacity and high service life at 85Deg. C.

The invention discloses a preparation method of a bio-based copolyester containing a modifiable functional group, and a random copolyester of alpha-methylene-gamma-butyrolactone, epsilon-caprolactone,delta-valerolactone, and gamma-butyrolactone prepared thereby. A binary catalysis system, which is composed of a strong alkali and a co-catalyst (urea or thiourea), is used to catalyze selective ring-opening co-polymerization of alpha-methylene-gamma-butyrolactone and other cyclic monomers to prepare the bio-based copolyester containing a modifiable functional group. The prepared bio-based copolyester can meet the application requirements of the biomedicine field, and the physical property of the bio-based copolyester can be modulated in a wider range.

The invention provides a new triterpene compound (valerolactone H) and an extraction separating method thereof. The new triterpene compound (valerolactone H) is separated from the fruits of orange magnoliavine fruit, has a novel structure, simple extraction separation process and a relatively higher content, facilitates the further pharmacological research thereof and creates the condition for developing novel anti-tumor and anti-HIV pharmaceuticals with good therapeutic effect and low toxic and adverse effects. The new triterpene compound (valerolactone H) has a structural formula as above.

The invention relates to a flexible absorbable composite interface screw sheath and a preparation method thereof. The flexible absorbable composite interface screw sheath is prepared by melt blendingand extrusion granulation of the mixture and injection molding, wherein the mixture mainly comprises a base material and polyethylene glycol, or mainly consists of a matrix material, a polyethylene glycol-flexible polylactone copolymer and beta-TCP, wherein the matrix material is polylactic acid and/or a copolymer thereof, and the flexible polylactone is a polymer of caprolactone and/or valerolactone; the flexible absorbable composite interface screw sheath has elongation at break of not less than 103%, the impact strength of not less than 10 kJ/m<2> and the breaking strength of not less than25 MPa. By adopting the method, the ductility, strength and impact toughness of the absorbable composite interface screw sheath are improved, and the prepared absorbable composite interface screw sheath has high elongation at break, high impact strength and high enough breaking strength, and has good application prospect.

An integrated two step method for making gamma-methyl alpha-methylene-gamma-butyrolactone (meMBL) from levulinic acid, in which levulinic acid is reacted with hydrogen in the first step to form a crude reaction product containing gamma-valerolactone, and the crude reaction product, without removal of unreacted levulinic acid therefrom, is reacted with formaldehyde in the second step to produce MeMBL.

The present invention discloses a method for preparing valerolactone through catalytic hydrogenation of ethyl levulinate. The method comprises: placing ethyl levulinate and different molar ratios of titanium zirconium microsphere catalysts in a device, adding isopropanol as a solvent and a hydrogen source, and carrying out a reaction for 2-10 h at a temperature of 160-200 DEG C, wherein a molar ratio of the titanium zirconium microsphere catalyst is Ti/Zr of 1:0, 8:2, 5:5, 2:8, and 0:1. According to the present invention, the catalytic activity of the method is good, the ethyl levulinate can be completely converted, the yield of the valerolactone can achieve 90.1%, the production cost is reduced by using the alcohol as the hydrogen source, and the catalytic system can be recycled more than 6 times while the catalytic efficiency is not significantly reduced.

The invention provides a method for dissolving and pre-processing lignocellulose biomass through a mixed solvent formed by ionic liquid and gamma-valerolactone to increase the sugar field of lignocellulose biomass. The method includes the following steps that firstly, ionic liquid, gamma-valerolactone and lignocellulose biomass are mixed to form a pre-dissolving and pre-processing system; secondly, a pre-dissolving mixture system is heated and dissolved, and a solution is formed; thirdly, an anti-solvent is added into the solution system, and the dissolved lignocellulose biomass precipitates and regenerates; fourthly, the regenerative lignocellulose biomass is taken, a buffering solution, cellulase and xylanase are added for enzymolysis, and a sugar solution is obtained. Part of the ionic liquid is replaced by biology-base gamma-valerolactone, and the mixed system is formed. The method has the advantages that the technology is simple, solvent cost is low, operation is convenient, the solvent can be recycled, and cellulose and hemicellulose in the processed lignocellulose biomass have the advantages that the enzyme hydrolysis speed is high and the sugar yield is high.

The invention provides a method for pretreating wood fibers in a bio-based polar aprotic solvent system, wherein the method comprises the steps: catalyzing and efficiently separating cellulose, hemicellulose and lignin in a bio-based polar aprotic solvent/water composite solvent by taking agricultural and forestry residues as raw materials; adding the agriculture and forestry residues, the bio-based polar aprotic solvent/water composite solvent and low-boiling-point organic acid into a pressurized reaction kettle, carrying out heating pretreatment, cooling to room temperature after pretreatment is finished, standing, filtering to obtain solid residues and filtrate, drying the solid residues, and weighing for preparing bio-based polar aprotic solvents such as gamma-valerolactone/dihydrolevoglucosenone and the like through hydrolysis and hydrogenation; and adding a certain amount of deionized water into the filtrate, filtering to obtain brown powdery lignin dissociation polyphenol, and performing reduced-pressure fractional distillation on the filtrate to recycle water, low-boiling-point organic acid and the bio-based polar aprotic solvent. The recycled water, the recycled low-boiling-point organic acid and the recycled bio-based polar aprotic solvent can be recycled.

The invention relates to a synthesis method of a ZnO@SiO2 supported mesoporous niobium phosphate catalyst and application thereof in preparation of 5-hydroxymethylfurfural. The synthesis method comprises the following steps: reacting diammonium hydrogen phosphate with niobium tartrate to generate niobium phosphate; reacting the niobium phosphate with a core-shell quantum dot ZnO@SiO2; after carrying out aging reaction for 24 h, centrifuging and drying, and calcining for 5 h at the temperature of 500 DEG C to synthesize a NbOPO4-ZnO@SiO2 solid acid catalyst; in a biphasic reaction system of water and gamma-valerolactone, taking glucose as a raw material, and preparing 5-hydroxymethylfurfural by catalytic hydrolysis of NbOPO4-ZnO@SiO2. The optimal preparation process conditions are as follows: the reaction time is 80 min, the reaction temperature is 140 DEG C, the use amount of the catalyst is 0.12 g, the use amount of the glucose is 0.24 mg, and the volume ratio of the water to the gamma-valerolactone is 1:9, and the yield of the 5-hydroxymethylfurfural is significantly increased by the process and is 84.96%.