55 results about "Dibenzyl ether" patented technology

The invention discloses a preparation method of RGD-modified ultra-small magnetic iron oxide nanoparticles. The preparation method comprises the following steps: preparing ultra-small magnetic iron oxide nanoparticles by taking ferric acetylacetonate as a reaction raw material and a precursor, taking oleylamine as a surfactant and a reducing agent and taking dibenzyl ether as a solvent; replacing oleylamine molecules wrapped on the surfaces of the nanoparticles by utilizing dopamine-modified HOOC-PEG-COOH to realize PEG-modification of the surfaces of the nanoparticles; and finally, chemically coupling RGD cyclic peptide by virtue of free carboxyl at the tail end of the PEG to obtain the RGD-modified ultra-small magnetic iron oxide nanoparticles. The method of synthesizing the ultra-small magnetic iron oxide nanoparticles has the characteristics of a simple process, a high raw material conversion ratio, strong repeatability and the like. The synthesized magnetic iron oxide nanoparticles have the characteristics of a regular morphology, an ultra-small dimension, good stability, good monodispersity, high biocompatibility, and tumor specific targeting, and the like, and can be used as a T1-weighted imaging high-performance magnetic resonance imaging contrast agent with a tumor active targeting function.

The invention discloses a nano conveyor belt which consists of tyre fabrics or canvas and a high polymer composite material covered on the fabrics or the canvas, wherein the high polymer composite material comprises the following raw materials in parts by weight: 20-40 parts of chloroprene rubber, 5-10 parts of nitrile rubber, 5-10 parts of natural rubber, 5-15 parts of polyvinyl chloride, 10-20 parts of diocty phthalate, 2-5 parts of chlorinated paraffin, 2-5 parts of antimonous oxide, 2-5 parts of tritolyl phosphate, 0.1-0.3 part of tetraisopropyl titanate, 0.1-0.5 parts of hydroquinone dibenzyl ether, 0.1-0.5 parts of tetramethylthiuram disulfide, 0.3-0.6 part of sulphur, 2-5 parts of carbon black and 1-3.6 parts of nano particles. The nano conveyor belt prepared of the invention is characterized in that the surface resistivity is 1.5*105 omega, and the body resistivity is 3.0*1.3 omega.m; the combustion time is 1.3 second, and the smoldering time is 0 second; and after the nano conveyor belt is soaked in water for 70 hours, the antistatic performance and flame resistance thereof have no obvious change.

The invention discloses a method of preparing dibenzyl ether from benzyl alcohol under the catalysis of graphene oxide. The method is as follows: graphene oxide is used as a catalyst, benzyl alcohol is used as a raw material, then a reaction is carried out at a temperature of 70 to 170 DEG C and a normal pressure for 12 to 36 h under an insulation condition, and a reaction solution is subjected to post-treatment after the reaction is finished so as to prepare dibenzyl ether. According to the invention, graphene oxide is used as the catalyst to catalyze dehydration of benzyl alcohol so as to produce dibenzyl ether, and the catalyst has high catalytic activity, high selectivity and no pollution, is green and environment friendly and can selectively catalyze dehydration of benzyl alcohol to produce dibenzyl ether; no solvent is used in the reaction, no metal participates in the reaction, reaction conditions are mild, and environment friendliness of a resultant is obtained on the premise that the conversion rate of benzyl alcohol and high selectivity of dibenzyl ether are guaranteed.

The invention relates to a catalyst for preparing low carbon mixed alcohol through synthesis gas and a preparation method thereof, which relate to low carbon mixed alcohol. The catalyst is a supported FeCo-alloy@Cu core-shell structure catalyst; a core layer of the core-shell structure is FeCo-alloy; a shell layer is Cu; an active phase of the core-shell structure FeCo-alloy@Cu accounts for 10 percent to 50 percent, and the balance is a carrier. The preparation method comprises the steps of mixing ferric salt, cobalt salt, dibenzyl ether, oleic acid and oleylamine; cooling a solution subjected to heating reaction, washing, centrifuging, and drying to obtain FeCo alloy nano particles which are denoted as the FeCo-alloy; re-dispersing the FeCo-alloy into absolute ethyl alcohol containing polyacrylamide for carrying out ultrasonography; adding a copper-bearing compound, adding an NH3.H2O solution to obtain a solution A, then adding a sodium borohydride solution, and obtaining a solid suspension liquid with the core-shell structure; then adding a carrier, stirring, carrying out extraction filtration, washing, and reducing dried solid to obtain the catalyst.

The invention discloses a preparation method of a MnFe2O4 nano magnetic material. The preparation method comprises the following steps: weighing a manganous salt sample and a ferrite sample according to a specific amount; taking dibenzyl ether as a solvent, adding oleylamine and oleic acid to form mixed liquid, and heating the mixed liquid to obtain a MnFe2O4 nano magnetic material which has a symmetrical structure microscopically, wherein a heating process is carried out under protection of N2 atmosphere; and selecting suitable heating parameters to obtain three-dimensionally symmetric, four-dimensionally symmetric, six-dimensionally symmetric and diamond-shaped symmetric MnFe2O4 nano magnetic materials. The invention provides the preparation method of the MnFe2O4 nano magnetic material. The prepared MnFe2O4 nano magnetic material has good symmetry; the grain size of the MnFe2O4 nano magnetic material is about 50 nanometers; the size of the MnFe2O4 nano magnetic material is close to the size of protein and the size of virus; and the dispersibility is good.

The invention discloses a high-selectivity green hydrolysis technology for preparing benzyl alcohol. The high-selectivity green hydrolysis technology includes the steps that sodium formate, benzyl chloride, water and organic tertiary amine catalysts are put into a reactor in the molar ratio of (1.05-1.1):1:7.0:0.02, sufficiently mixed and stirred, and subjected to normal-pressure reacting for 8 h to 9 h at the temperature of 100 DEG C to 115 DEG C, heating is stopped, the temperature is reduced to be 95 DEG C to 105 DEG C, caustic soda with the molar weight equal to the molar weight of the benzyl chloride is put, and the mixture continues to be reacted for 2 h to 3 h; the reacted mixture is filtered, solid sodium chloride is removed, the liquid-phase product is cooled, and the organic-phase product is separated; the organic-phase product is subjected to rectification separation, and the high-purity benzyl chloride is obtained; the water-phase product is returned to the reactor again, and repeated hydrolysis reacting is carried out after the raw materials are supplemented; According to the high-selectivity green hydrolysis technology, the benzyl chloride is subjected to hydrolysis with the sodium formate as an assistant and the organic tertiary amine as a catalyst to prepare benzyl alcohol, and the adopted organic organic tertiary amine catalysts are low in price and high in catalysis efficiency; the water-phase product obtained through the reaction can be recycled, high-salt wastewater in the production process of the benzyl alcohol is solved, and meanwhile the content of the dibenzyl ether is greatly reduced, wherein the content of the dibenzyl ether is lower than 3.5%.

The invention discloses a method for preparing benzyl benzoate by oxidizing dibenzyl ether, which comprises steps as follows: A, oxidization; B, rectification and refining; C, acid-alkali neutralization; D, freezing crystallization; and E, centrifugal separation. According to the method disclosed by the invention, by-product dibenzyl ether produced by benzyl alcohol preparation is used as a raw material, so that the defects of other benzyl benzoate preparation methods are well solved; the preparation cost is low, the product quality is good, and no pollution is caused; and therefore, the preparation method disclosed by the invention is the method of preparing high-quality benzyl benzoate by low cost.

The invention discloses a method for magnetic field assisted solvothermal synthesis of ferrite and a magnetic grain size and morphology characteristic regulation and control method, and belongs to thetechnical field of ferrite preparation and synthesis. The preparation method comprises the following steps of: uniformly mixing oleic acid, oleylamine and dibenzyl ether, heating to remove water or alcohol, and naturally cooling to room temperature; taking iron and acetylacetonate of metal M as raw materials, uniformly mixing the raw materials with a solvent, pouring the mixture into a beaker, putting the beaker into a polytetrafluoroethylene lining of a Hastelloy alloy reaction kettle, and placing a magnet below the beaker in the polytetrafluoroethylene lining; pouring a solvent into the outer side of the polytetrafluoroethylene lining to serve as a heat transfer medium, heating to carry out a solvothermal reaction, thereby obtaining the MFe2O4 ferrite. Through the resistance of the solvent to magnetic ions and particle migration, the dipole interaction force among the magnetic particles and the synergistic effect among the external magnetic field forces, the regulation and control of the size and morphology characteristics of the magnetic crystal grains for preparing the ferrite are realized. By changing the size of the synthetic magnetic field, the magnetic particles with single domain critical size and superparamagnetic critical size can be prepared.

The invention provides a system and a technology for producing benzaldehyde by utilizing benzyl chloride and benzyl alcohol waste materials. The system comprises the main equipment of an oxidizing furnace, an oxidizing kettle, a hydrolyzing kettle, an alkaline hydrolysis kettle, a crude distillation tower, a crude distillation kettle and a rectifying tower. The technological process is simple. The technology solves the discharging problem of the benzyl chloride and benzyl alcohol waste materials, namely dibenzyl ether and benzyl chloride, the waste materials are changed into treasure, and benzaldehyde products with a higher added value are produced. The environmental protection problem is solved, and economic benefits are also created.

The invention discloses a nano alloy modified cerium oxide powder applied to soot combustion reaction, and a preparation method thereof, and relates to cerium oxide powder. The powder is prepared from a platinum nano alloy phase and a cerium oxide or cerium-zirconium mixed oxide carrier. The method comprises the following steps: mixing organic salt of each metal component, and then preparing into a mixed metal ion octyl ether solution or a mixed metal ion dibenzyl ether solution; adding a mixed surfactant to the mixed metal ion octyl ether solution or the mixed metal ion dibenzyl ether solution, so as to obtain a reduction-type mixed metal particle dispersed solution; heating and refluxing the reduction-type mixed metal particle dispersed solution, and then adding a high-polarity alcohol solvent to separate out nano particles in a gathering manner; dispersing into a low-boiling point organic solvent after removing the alcohol solvent in a volatilizing manner, so as to prepare nano alloy disperse precursor solution; putting the carrier into a container, and wetting by using an organic solvent, so as to obtain a wetting vector; injecting the nano alloy disperse precursor solution to the wetting carrier, lastingly stirring until a mobile phase volatilizes, so as to obtain wetting powder; drying and burning, so as to obtain the product.

This invention has disclosed a kind of producing method for substituted dibenzyl ether. This method adopts substituted benzyl halogen react with water to produce substituted dibenzyl ether directly by the catalyst of metal halide. It does not use alkali substance, after separate and concentrate, procreant HX can be regenerated. This method is simple and environmental protection, costs little.

The invention discloses a method for removing benzaldehyde impurities in benzyl alcohol, which comprises the following steps: opening a steam control valve to heat and dry a cleaned rectification system, introducing nitrogen into the rectification system through an atomizer for 15-30 minutes, and replacing air in the rectification system; under a reduced pressure condition, adding benzyl alcohol to be refined into a rectification system, starting stirring, slowly heating to raise the temperature, controlling the temperature to be 170-220 DEG C and the time to be 30-60 minutes, and discarding collected fractions; and under the condition of stirring, slowly adding a reducing agent into benzyl alcohol in a rectification system, and controlling the quantity of fractions to be 15-30kg/h. The method has the beneficial effects of simple process, high efficiency, environmental protection and large-scale industrial production; impurities and peroxides such as benzaldehyde, cyclohexyl methanol,benzyl chloride, dibenzyl ether and benzene remaining in benzyl alcohol can be efficiently removed, the quality of benzyl alcohol refined by improving the content of benzyl alcohol meets and exceeds related standard requirements of crude drugs and pharmaceutic adjuvants, and the content of benzaldehyde is smaller than 0.001%.

The invention provides a preparation method of a Pt-Fe nano catalyst, which comprises the following steps of: preparing a Pt-Fe nanowire;, specifically, the preparation method of the PPt-Fe nanowire comprises the steps of mixing and heating platinum acetylacetonate, cetyl trimethyl ammonium chloride, dibenzyl ether and oleamine, then mixing and heating the mixture with a dibenzyl ether solution ofdodecylcarbonyl triiron and performing cooling, separating, washing and drying to obtain the Pt-Fe nanowire; and mixing the Pt-Fe nanowire, a solvent and active carbon, and then performing stirring,centrifuging and washing to obtain the Pt-Fe nano catalyst loaded on the active carbon. According to the method, the Pt-Fe nanowire with rich high-index surfaces are obtained through the control of reaction conditions, the size and the length of the Pt-Fe nanowire are uniform; in the selective hydrogenation of acetophenone, only carbon-oxygen double bonds of the acetophenone can be selectively hydrogenated, so that benzene ring hydrogenation or over hydrogenation deoxygenation is avoided, a single phenylethanol product is obtained, and the selectivity of obtaining phenylethanol through extremely high hydrogenation is achieved.

The invention discloses a formula of protective paint for an explosion-proof process door. The formula comprises chlorinated rubber resin, fatty alcohol ether sodium sulfate, dimethicone, dibenzyl ether, glycolic acid, methyl anyl alcohol, sepiolite powder, wollastonite, glyceride of sepiolite powder, and magnesium oxide micropowder. The formula has the advantages that the explosion-proof door canbe effectively protected, the anti-ultraviolet and anti-aging effects are realized, and the service life of the explosion-proof door is prolonged.