38 results about "Glycol formation" patented technology

The present invention provides a process treating the cycle gas from an ethylene oxide reactor to avoid heat losses in a carbonate scrubbing system as well as glycol formation in the carbonate scrubbing and catalyst contamination upon cycle gas recycle.

The invention relates to a method for separating glycol and 1,2-butanediol, which mainly solves the problems of high investment and energy consumption due to the fact that a very high reflux ratio and very high number of theoretical plates are required when a common rectification method is employed to separate and purify a material flow containing glycol and 1,2-butanediol, and severe separation conditions or a non-ideal separation effect when a common azeotropic rectification method is employed. The method better solves the problem by employing the technical scheme that the material flow containing glycol and 1,2-butanediol and a reactor enters from the upper part and the lower part of a reaction-azeotrope rectification tower respectively, a generated reaction product forms an azeotrope with glycol at the same time, a tower kettle obtains a material flow containing 1,2-butanediol, and after the azeotrope distilled from the tower top is subjected to condensation phase splitting, a glycol-rich phase at the lower layer is further refined to form a glycol product. The method can be used for industrial production of separating the material flow containing glycol and 1,2-butanediol.

The invention discloses a clad modified layered cathode material of a lithium-ion battery and a preparation method of the layered cathode material. The material is obtained by evenly covering the layered cathode material of the lithium-ion battery by a Li2TiO3 thin film. The preparation method comprises the following steps: (1) dissolving a titanium source in an ethanol solution, and dropwise adding glycol to form a solution A; dissolving a lithium salt and a complexing agent in deionized water to form a solution B; (2) mixing the two solutions and regulating the pH value of the mixed solution to the range of 5-7 by use of a weakly alkaline liquor or a weakly acidic liquor; (3) adding the layered cathode material of the lithium-ion battery to a suspension, and heating and stirring to obtain a sol; drying the sol to obtain a precursor; grinding and annealing the precursor to obtain the target product. The method is used for modifying the layered cathode material of the lithium-ion battery by covering the layered cathode material with the Li2TiO3 thin film; the surface thin film covering the cathode material by use of the method is clad evenly, and the method is mature and reliable.

The invention discloses a preparation method of a high-performance aluminum and potassium co-doped sodium vanadium fluorophosphate/carbon composite material. According to the preparation method, a uniform solution is formed from a reaction raw material and low-molecular polyethylene glycol, a high-activity aluminum-doped vanadium phosphate/carbon composite material is prepared by combining carbonthermal reduction reaction, and the high-performance Na<1-x>K<x>V<1-y>Al<y>PO<4>F/C composite material is obtained by high-temperature reaction under inert atmosphere by taking the aluminum-doped vanadium phosphate/carbon composite material as the raw material. Carbon with high electron conductivity is generated from polyethylene glycol and a carbohydrate under a high-temperature inert atmospherecondition in an in-situ way, carbon can generate a reduction agent in carbon thermal reduction reaction, and growth and agglomeration of product particles also can be prevented; a larger passage is provided for sodium ion mobility by sodium doped with potassium, and the structural stability of sodium vanadium fluorophosphate is improved by vanadium doped with aluminum; and by combining the advantages of high electron conductivity, large sodium ion mobility passage and structural stability, the aluminum and potassium co-doped sodium vanadium fluorophosphates/carbon composite material has excellent electrochemical performance.

The invention belongs to the field of nanometer materials and nanometer technologies and in particular relates to a silkworm-chrysalis-shaped PbS quantum dot/graphene composite material and a preparation method thereof. The preparation method comprises the steps of evenly dispersing graphene oxide into ethylene glycol to form graphene oxide-ethylene glycol dispersion liquid; adding lead nitrate powder into the graphene oxide-ethylene glycol dispersion liquid to obtain lead nitrate-graphene-ethylene glycol dispersion liquid; dissolving sodium sulphide into ethylene glycol to form sodium sulphide-ethylene glycol solution; processing the lead nitrate-graphene-ethylene glycol dispersion liquid through ultrasound, adding the sodium sulphide-ethylene glycol solution into the lead nitrate-graphene-ethylene glycol drop by drop and mechanically stirring to obtain PbS quantum dot-graphene dispersion liquid after reaction; then centrifugally separating, washing and drying to obtain the PbS quantum dot/graphene composite material. The prepared PbS quantum dot/graphene composite material is of a silkworm-chrysalis-shaped three-dimension structure, even in quantum dot particle size and excellent in gas-sensitive property to ammonia gas in a room temperature and a low temperature.

The invention relates to a preparation method for a front electrode of an organic thin film solar cell. The preparation method comprises the following steps of (a) taking a glass slide as the substrate, and sputtering an AZO thin film on the substrate; (b) adding polyvinyl pyrrolidone, 1-methyl-3 ethyl imidazolium bromide and ethylene glycol into a reaction kettle to form a mixed solution; next, adding an ethylene glycol solution of silver nitrate to the mixed solution, sealing and placing the mixed solution at a temperature of 100-120 DEG C to react for 1-5h, then carrying out centrifuging, cleaning and carrying out ultrasonic dispersion on the mixed solution to obtain a silver nanowire water solution; (c) adding a chloroauric acid solution and an oxidizing agent to the silver nanowire water solution to react at a temperature of 5-30 DEG C for 5-10min, next, adding a reducing agent to the mixture to continue to react for 5-10min; then centrifuging, washing and evaporating the mixture to remove water, and drying the mixture to obtain a gold-coated silver nanowire; (d) dispersing the gold-coated silver nanowire into an isopropanol solution, and then coating the surface of the AZO thin film with the processed isopropanol solution in a spin-coating manner to a obtain a composite layer sample; and (e) sputtering the AZO thin film on the surface of the composite layer sample. By adoption of the preparation method, the efficiency of the organic thin film solar cell is improved.

The invention discloses paclitaxel modified by branched polyethylene glycol and a preparation method of paclitaxel, wherein the structure of the paclitaxel modified by branched polyethylene glycol is shown as the formula I. According to the preparation method, in a solvent, branched polyethylene glycol and paclitaxel formed by connecting two amino groups of lysine with polyethylene glycol respectively are taken as raw materials, 4-dimethylaminopyridine is taken as a catalyst, and N,N'-dicyclohexylcarbodiimide is taken as a condensating agent, and the branched methoxy polyethylene glycol paclitaxel compound is obtained through reaction. The formula I is shown in the description.

The invention relates to an antistatic polyethylene glycol terephthalate composite material. Glycol, terephthalic acid and nano antistatic agent-glycol sol are polymerized, the esterification reaction temperature is 200-290 DEG C, and the pressure is 0.1-0.5MPa; the low-vacuum polycondensation reaction temperature is 200-290 DEG C, the pressure is reduced from normal pressure to 1,000Pa; and the high-vacuum polycondensation reaction temperature is 250-300 DEG C, and the reaction vacuum degree is 100-50Pa. The nano antistatic agent-glycol sol is formed by nano carbon black, nano metal, nano metal compounds and glycol. A nano antistatic agent accounts for 0.1-10% of the weight of the polyethylene glycol terephthalate and accounts for 1-10% of the weight of the nano antistatic agent-glycol sol. The intrinsic viscosity of the material is 0.55-0.75dL/g, and the volume resistivity of a fiber is 108 ohms/cm-109 ohms/cm.

The invention discloses graphene composite rubber for an automobile air inlet hose and a preparation method thereof. The composite rubber is prepared by the following steps: a, adding terephthalic acid into ethylene glycol to form oil phase liquid; b, mixing graphene, polyethylene glycol octylphenyl ether with water, then adding the oil phase liquid, and drying the mixture and grinding the mixtureinto microspheres after a reaction; c, mixing the microspheres with nitrile rubber latex, and carrying out flocculation to obtain coprecipitation glue; and d, compounding the coprecipitation glue with ethylene propylene diene monomer rubber, stearic acid, aromatic oil, an accelerant and a cross-linking agent to obtain the high-temperature oil-resistant graphene composite rubber. The method has the benefits that: the composite rubber is modified by graphene/polyethylene terephthalate powder microspheres, and the prepared material has excellent high-temperature resistance and oil resistance, and can be widely applied to automobile air inlet hoses.

The invention belongs to the technical field of two-aqueous-phase extraction of viruses, and discloses a method for concentrating and purifying porcine SenecaviusA (SVA) particles through two-aqueous-phase extraction. The method comprises the following steps: performing SVA reproduction; carrying out indirect immunofluorescence identification on the SVA; establishing a three-step aqueous two-phase extraction method; determining the content of SVA; carrying out a western blot test; and carrying out electron microscope identification on SVA. After low-concentration polyethylene glycol and inorganic salt are added into an SVA culture solution, cell debris is removed, and then polyethylene glycol is added to form an aqueous two-phase system, so that concentrated and purified porcine SVA virus particles can be quickly obtained; rapid separation of virus particles can be realized through an aqueous two-phase extraction technology, the recovery rate and the purity of the virus particles are relatively high, the process is simple, and the cost is low; through a three-step aqueous two-phase extraction method, the purpose of concentrating and purifying the porcine SVA virus particles from the cell culture fluid is achieved, and the method can be applied to laboratory and large-scale production at the same time.

The invention relates to a method for preparing hafnium boride powder. The method comprises the following steps: dissolving a hafnium source compound in a first solvent to form a first solution; dissolving a boron source compound and a carbon source compound in a second solvent, and adding polyethylene glycol to form a second solution; adding the first solution into the second solution, and collecting the generated precipitate; and drying the collected precipitate, grinding the dried precipitate into powder, and carrying out high-temperature calcination to prepare the hafnium boride powder. The preparation process is simple, the reaction process is easy to control, the production period is short, the cost is low, the prepared hafnium boride powder has high purity, small particle size, narrow particle size distribution and good microstructure, and the mechanical property and sintering driving force of a sintered body can be enhanced in the subsequent forming process.

Embodiments of the current invention include a hydrogel formed from crosslinked polyethylene glycol into which acrylated glucose oxidase has been immobilized through crosslinking to the gel. These hydrogels can be used to create hypoxia under ambient conditions for at least 72 hours and can be used to create hypoxic gradients. These embodiments permit the study of cells under a variety of hypoxic conditions.

The invention provides a palladium-nickel-titanium ethylene glycol coordination polymer heterogeneous catalyst as well as a preparation method and an application thereof. The invention provides a synthesis method of a micron-sized rod-like heterogeneous catalyst of a palladium-nickel-titanium ethylene glycol coordination polymer, which is simple and easy to obtain and can be massively prepared at one time. The preparation method comprises the following specific preparation steps: firstly, dissolving palladium salt and nickel salt in ethylene glycol to form a 0.1-0.4 mol.L <-1 > solution, then dissolving a titanium source in the ethylene glycol solution, and continuously stirring at room temperature to prepare the micron-sized rod-like heterogeneous catalyst material. The length of the rod-like structure is 0.8-5 microns, and the diameter of the rod-like structure is 100-120 nm. The prepared material can effectively catalyze the Suzuki coupling reaction, and the heterogeneous catalyst is high in catalytic efficiency, convenient to recycle and reusable, and has important significance in industrial production.

The invention discloses a preparation method of a diamine ternary eutectic solvent and application of the diamine ternary eutectic solvent to efficient capture of SO2. According to the invention, different amine substances and different proportions thereof in the diamine ternary eutectic solvent are regulated and controlled, and the diamine ternary eutectic solvent with different amine substances and different proportions is designed and synthesized and is applied to SO2 absorption. Amino groups provided by diamine substances in the diamine ternary eutectic solvent and ethylene glycol form hydrogen bonds, strong charge interaction is formed between the hydrogen bonds and SO2, and thus efficient capture of SO2 is achieved, the diamine ternary eutectic solvent is used as an absorbent to absorb SO2 gas, the absorption pressure is 0-1.5 bar, the absorption temperature is 0-80 DEG C, and the absorption time is 1-6 h. After absorption, SO2 is easy to desorb, the desorption temperature is 50-100 DEG C, and the desorption time is about 2-6 hours. Compared with a traditional SO2 trapping method, the highest absorption capacity can reach 0.82 g SO2/g DES.