39results about How to "No catalyst required" patented technology

The invention belongs to the technical field of preparation of selenium-containing polymers, and discloses a method for preparing polyselenourea/polyselenoamide through multi-component polymerizationof elemental selenium, isonitrile/alkyne and amine. The method comprises: carrying out a reaction on elemental selenium, a binary triple bond compound and a diamine in an organic solvent under an inert atmosphere, and subsequently treating to obtain a selenium-containing polymer, wherein the binary triple bond compound is binary isonitrile or binary alkyne, and the selenium-containing polymer is polyselenourea or polyselenoamide. According to the present invention, the method has characteristics of mild reaction conditions, high efficiency, energy saving, no catalyst, no by-product generation,atomic economy, green chemistry, low monomer toxicity, high atom utilization rate and high yield (more than or equal to 90%); the group has strong tolerance, and a variety of functional groups can beintroduced into the monomer; and the polyselenourea/polyselenoamide is stable, and can be degraded under specific conditions.

The invention discloses a technology for producing cytarabine through a chemical synthesis method, relating to a synthesis technology of an organic compound and aiming to provide a technology for producing the cytarabine through the chemical synthesis method, which has the advantages of cheap and available raw material, simple reaction condition, low cost, environmental protection and high yield. Based on the solving technical scheme, the technology for producing the cytarabine through the chemical synthesis method has a synthetic route which comprises the following synthesis steps of: firstly, reacting the cytarabine (1) used as a starting raw material with hexamethyldisilazane (HMDS) for 10-80h under the pressure of 5-20kg and at the temperature of 70-160 DEG C, cooling, stirring and vacuum concentrating a reaction system, and removing and recovering redundant hexamethyldisilazane to obtain an intermediate (II), wherein the dosage of the hexamethyldisilazane is 2-10 times larger than the weight of the cytarabine; secondly, dissolving the intermediate (II) into a proper solvent, and cooling or stirring to prepare crude cytarabine. The invention is used for preparing an anticancer drug.

The invention discloses an Ag/CNTs/GO compound with a sandwich structure and a preparation method thereof. In the sandwich structure, the upper layer and the lower layer are graphene oxide thin layers, and the middle is a carbon nanotube layer with a hollow structure, wherein nano-silver particles are uniformly dispersed in graphene oxide and carbon nanotubes. The method provided by the invention has the advantages of simplicity and practicability, convenient operation, easy control, simplicity and environmental protection. Also, the prepared Ag/CNTs/GO compound with a sandwich structure strengthens the collaborative immobilization capacity of graphene and carbon nanotubes to nano-silver, so that the compound can have very good stability, and the dispersibility of nano-silver particles are improved. At the same time, the compound also shows a strong inhibitory effect on Gram positive bacteria (staphylococcus aureus) and Gram negative bacteria (Escherichia coli) and other strains.

The invention relates to a preparation method of hypnone, in particular to a method for preparing hypnone by direct photooxidation under the condition with Alpha-vinyltoluene and without catalyst. The invention belongs to the technical field of organic synthesis application. The Alpha-vinyltoluene and acetonitrile with the volume ratio of 1: (0.4 to 100) are put into a light reactor and stirred. The hypnone is prepared after putting through condensed water into a reactor casing and adjusting the flow rate, maintaining reaction temperature to be room temperature, inletting oxygen into the reactor with the flow rate of 2 to 15ml/min, lighting a 125w medium pressure mercury lamp and reacting for 0.5 to 20 hour(s). The method can be used for synthesizing hypnone directly at room temperature without catalysts so as to reduce synthesis cost; furthermore, the method has the advantages of less toxicity and being environment protective.

The invention discloses a method for preparing acetylene by cracking waste grease with thermal plasma. The method comprises the following steps of: introducing a working gas to a plasma generator, and forming thermal plasma jet after arcing; and filtering and atomizing the waste grease, mixing the waste grease with a delivered gas, introducing the mixture to the thermal plasma jet in the plasma generator, performing millisecond cracking reaction, and quenching with a cooling medium to obtain cracked gas containing acetylene. The working gas is one or more of hydrogen, argon and nitrogen; the delivered gas is one or more of hydrogen, argon and nitrogen, and can be the same as or different from the working gas; and the cooling medium is one or more of water, hydrogen and waste grease serving as raw materials. According to the method, the waste grease is used as a raw material, so that high value-added utilization of the waste grease is realized, and environmental pollution is reduced; and the method is short in process flow, environment-friendly, economic, efficient, high in utilization rate of the raw materials and high in yield of the acetylene product.

The invention provides a method for an anhydride modified melamine resin. The method is free from catalysts, solvents and purification. By adopting the method, the controllable reaction for one-substitution to three-substitution can be realized, and the anhydride modified melamine resin can be directly produced in a one-step way.

The invention provides a method for preparing a graphene electrode in a high-temperature piezoelectric sensor. The method includes the following steps that a pretreated high-temperature piezoelectric crystal plate of the high-temperature piezoelectric sensor is placed into a plasma chemical vapor deposition cavity, the cavity is closed, and a vacuum pump is started; when air pressure inside the cavity is lowered to 10<-5> Torr or below, shielding gas and carbureted hydrogen gas are connected in to adjust the pressure intensity inside the cavity; and a vacuum reacting furnace is started for heating and warming, a plasma source is switched on to perform constant temperature deposition, and accordingly the graphene electrode can be obtained. According to the preparation method of the graphene electrode, the high-temperature piezoelectric crystal plate is used as a substrate, a small or large number of layers of graphene are grown on the surface of the crystal plate without metal catalysis as the electrode through the plasma enhanced chemical vapor deposition (PECVD) technique directly, adhesive force between a graphene thin film and the crystal plate is good, and electrical conductivity of the graphene thin film is excellent.

The invention discloses a preparation method and application of a heptamethine indocyanine dye, and belongs to the field of polymethine indocyanine dyes and preparation thereof. The method comprises the following steps: 1) carrying out a heating reaction on raw materials containing a 2,3,3-trimethylindole derivative and a nucleophilic substituted compound under a vacuum condition to obtain an organic ammonium salt; and 2) carrying out a heating reaction on a solution containing the organic ammonium salt obtained in the step 1) and a cycloalkene derivative under a closed condition. According tothe invention, the structural formula of the heptamethine indocyanine dye is represented by a formula (I); the dye has near-infrared light absorption and fluorescence development performances and canbe used as a probe auxiliary agent; and the method is short in synthetic route, green in solvent, simple in process, free of noble metal catalysis, large in single reaction amount, high in product yield and purity, high in universality and capable of being used for synthesizing products of various structure types.

The invention relates to a polyester elastomer and a preparation method thereof. The xylitol base polyester elastomer is obtained by adopting a melting polycondensation method with xylitol as a main elastomer and itaconic acid, succinic acid, dodecanedioic acid, hexadecanedioic acid, octadecyl diacid and octadecadienoic acid as comonomers. The elastomer has higher biocompatibility and biodegradability and low toxicity; the xylitol belongs to a polyhydroxyl monomer; when the xylitol copolymerized with other monomers, the xylitol can adjust the crosslinking density of a polymer by changing the category and composition of the comonomer, thereby realizing controllable performance; and accordingly, the polymer has a wide application range. The invention has the advantages of simple preparation method, no catalyst and simple post treatment, and the obtained polyester elastomer has high biocompatibility; by controlling monomer molar ratio and reaction condition, the mechanical performance, hydrophobic performance and water absorption rate of the material can be adjusted; and the material is expected to be used as a medicament slow-release carrier, a styptic preparation, bone wax, a tissue engineering bracket, a surgical operation anti-adhesion film, and the like.

The invention discloses a comprehensive utilization method of pyrite concentrate and high-sulfur coal. With pyrite concentrate as a raw material, the method comprises the following steps: extracting sulfur from pyrite concentrate by a thermal distillation process to prepare sulfur S; further desulfurizing the slag after the sulfur extraction by a boiling process to obtain SO2 gas; preparing sulfuric acid from the SO2 gas; and finally, with the desulfurized slag and high-sulfur coal as raw materials and in the presence of flux, sintering to obtain a sintered iron ball. The method turns waste into wealth and realizes mass-energy balance with the most economical technology and has a broad application prospect.

The invention provides a two-dimensional carbon nanosheet with the thickness capable of being accurately controlled and the preparation method thereof, wherein the thickness of the carbon nanosheet with the thickness capable of being accurately controlled can be accurately controlled from 5.1 nm to 92.3 nm, and the carbon nanosheet has a high specific surface area and intrinsic nitrogen doping with atomic-scale uniform distribution. The preparation method comprises the following steps: by taking 4,4'-biphenyl diamine and 1,2,4,5-pyromellitic dianhydride as monomers, carrying out stepwise polymerization to form an amphiphilic alternating copolymer; by using the amphiphilic alternating copolymer as an assembly unit, carrying out an intramolecular imidization reaction to induce the amphiphilic alternating copolymer to perform crystallization driving self-assembly, thereby forming the polymer nanosheet of which the thickness can be accurately controlled; and calcining the polymer nanosheetin an inert atmosphere to obtain the two-dimensional carbon nanosheet with accurately controllable thickness. The two-dimensional carbon nanosheet has high specific surface area and atomic-scale uniformly distributed intrinsic nitrogen doping, can be used as a catalyst for electrocatalytic oxygen reduction, shows excellent electrocatalytic performance and can be used as a catalyst of a fuel cell.

The invention discloses a sandwiched interlayer structure Ni(OH)2/CNTs/Ni(OH)2 composite material preparing method. The method includes the following steps that polyvinyl pyrrolidone is dissolved in deionized water, and the polyvinyl pyrrolidone and the deionized water are stirred and evenly mixed; layered Ni(OH)2 materials are added in and dissolved in the solution, stirring is performed for the first time, products are collected in a centrifuging mode, vacuum drying is performed for the first time after washing is performed repeatedly, and then processed Ni(OH)2 can be obtained; the processed Ni(OH)2 and acidulated multi-wall carbon nanometer tubes are dissolved in deionized water, stirring is performed, after one night, products are collected in a centrifuging mode, vacuum drying is performed for the second time after washing is performed repeatedly, and sandwiched interlayer structure Ni(OH)2/CNTs/Ni(OH)2 composite materials are obtained. According to the method, metal hydroxide is doped with carbon materials, and therefore not only can agglomeration of the metal hydroxide be prevented, but also the electrical conductivity and the specific capacity of the metal hydroxide can be greatly improved.

The invention discloses a preparation method of a two-dimensional rhenium sulfide-molybdenum sulfide vertical heterostructure, which comprises the following steps: by adopting a chemical vapor deposition method, taking Si/SiO2 as a substrate, taking a metal rhenium foil (Re) as a rhenium source, taking a metal molybdenum foil (Mo) as a molybdenum source, flatly laying the metal rhenium foil on the surface of one end of the metal molybdenum foil, inversely buckling the substrate on the metal molybdenum foil, and reacting with sulfur vapor to obtain the two-dimensional rhenium sulfide-molybdenum sulfide vertical heterostructure. A two-dimensional ReS2/MoS2 vertical heterostructure with multiple layers of ReS2 as a bottom layer and double layers of MoS2 as a top layer is prepared on a substrate. The obtained two-dimensional ReS2/MoS2 vertical heterojunction material is a crystal formed by stacking two crystals with different sizes, shows a remarkable luminescent property, can be used as a channel material of a transistor to be applied to the field of ultrathin electronic devices, and has potential application in the field of efficient light detectors.