30results about How to "Suitable for magnification" patented technology

The invention relates to methanol-to-gasoline catalysts, in particular to a ZSM-5 / MCM-48 composite molecular sieve, a preparation method and application thereof. The composite molecular sieve adopts a ZSM-5 microporous molecular sieve as the seed crystal, on the surface of which a MCM-48 mesoporous structure composite molecular sieve that is chemically interlinked at a mesoporous and micropore interface is obtained by overgrowth. The composite molecular sieve undergoes acidification, and then is mixed with a binder to undergo molding and roasting, and the product is used as a catalyst for methanol-to-gasoline (MTG) reaction. The catalyst provided by the invention is used for overgrowth of the mesoporous molecular sieve on the microporous molecular sieve surface, integrates the advantages of the microporous material and the mesoporous material so as to develop the strong points and avoid the weak points and reach a synergistic effect. The catalyst shows good catalytic properties to the methanol-to-gasoline (MTG) reaction, has high selectivity to gasoline products and a low aromatic hydrocarbon content, and extends the carbon chain length. More importantly, the problems of high reaction temperature, high aromatic hydrocarbon content in oil products, and limitation of hydrocarbon compounds only to less than C11 in traditional MTG technologies are solved.

The invention discloses a polymer microsphere and preparation method and application thereof. Polystyrene is used for making a base sphere with the surface comprising a condensed-nuclei aromatic structure in pi-pi interaction with fullerene, and the structure is obtained by substituting a hydrogen atom on a benzene ring contained in the base sphere by chloromethyl and reacting with condensed-nuclei aromatics. The method includes: using a monodispersed polystyrene microsphere as the base sphere, mixing with catalyst SnCl4, adding aliphatic halogenate varsol, slowly dripping chloromethylation reagent while stirring for substitution reaction, allowing the reacted microsphere to react with the condensed-nuclei aromatics, and washing and drying the obtained microsphere to obtain a polymer microsphere with a fullerene separated liquid chromatographic stationary phase serving as a mobile phase. The preparation method of the surface modified polystyrene polymer microsphere only needs two steps, is simple in process, easy to repeat, suitable for massive production of fullerene and has the advantages of high separation efficiency and effectiveness.

The one-pot method for preparing 2-bromo-9,9-diphenylfluorene belongs to the technical field of organic synthesis, and comprises the following steps: (1); (2). The reaction of the present invention can be completed in one reactor, especially the chlorination reaction, without the need to separate the intermediate product, and directly add the system reactant and catalyst to carry out the subsequent reaction in which the chlorine atom is replaced by the benzene ring. The whole operation is simple and the process is reliable. , suitable for amplification; in addition, the catalyst used in the present invention can effectively reduce side reactions, improve product yield, reaching more than 90%, and because it is a solid catalyst, it can be separated by filtration after the reaction, which simplifies the post-treatment process.

The invention discloses a micro-nano structure Al-FeF3 compound fuel and a preparation method thereof. The method includes the steps: adding aluminum powder, additives FeF3 and stearic acid into a planetary ball mill, and performing high-energy ball milling according to the ratio of grinding media to materials and process parameters; taking out materials, adding organic solvents, and naturally drying the materials to achieve passivation of the materials; cleaning the materials by the organic solvents, drying the cleaned materials, and packaging the dried materials. In the aspects of a structure and a form, the prepared micro-nano structure Al-FeF3 compound fuel has the advantages that the aluminum powder has a micron-sized form and accounts for 95% or more of the weight of the compound fuel, the additives FeF3 have a nano-sized form and are uniformly embedded into surface layers and the inside of the aluminum powder, the additives FeF3 can serve as metal fuels for solid rocket propellants to replace the aluminum powder, so that an ignition point of the aluminum powder can be reduced, low-temperature oxidation performance of the aluminum powder is improved, and two-phase loss of a rocket nozzle is reduced. A preparation process of the compound fuel is simple, preparation devices are mature, and industrial amplification can be achieved under a certain scale.

The invention discloses a method for preparing benzalacetone under the supercritical condition. According to the conventional synthetic method, reaction is realized by an autoclave, and is intermittent, low in space time yield of the reaction and high in energy consumption. According to the method, the benzalacetone is prepared by performing the one-step condensation reaction of benzaldehyde and acetone which serve as raw materials under the supercritical condition, wherein the conversion rate of the benzaldehyde is over 99 percent, and the reaction yield of the benzaldehyde is over 92 percent. According to method, other solvents and acid or base catalysts are not needed to be added, the residual acetone can be recycled directly, so the method has the advantages of environment friendliness, no pollution, high selectivity and the like.

The invention discloses a method for preparing raspberry ketone under supercritical conditions. Using p-hydroxybenzaldehyde and acetone as raw materials and an aromatic hydrocarbon solvent as a solvent, the condensation reaction is carried out continuously in a pipeline reactor. p-Hydroxyphenylbutenone is obtained, and then the methanol solution of p-Hydroxyphenylbutenone and hydrogen are subjected to a hydrogenation reduction reaction in a tank reactor under the action of a nickel catalyst to generate raspberry ketone. The preparation method solves the problem of environmental protection, has the advantages of simple process, no need to use acid or alkali catalyst, less waste, high yield, easy scale-up, and high industrial application value.

The invention provides a porous carbon supported trimanganese tetraoxide nanoparticle composite material and a preparation method thereof. The composite material is prepared from, by weight, 50%-80% of trimanganese tetraoxide nanoparticles and 20%-50% of three-dimensional porous carbon material stent prepared from ginkgo leaves. When the composite material is prepared, manganese acetate and potassium hydroxide are added into the three-dimensional porous carbon material stent according to the stoichiometric ratio of carbon to trimanganese tetroxide, and the composite material is obtained after reacting is conducted. According to the porous carbon supported trimanganese tetraoxide nanoparticle composite material, the reversible capacity of the composite material can reach 500 mAh / g or above after charging and discharging are conducted 50 times under the electric current density of 100 mA.g<-1>.

The invention discloses a synthesis method of rosuvastatin tert-butyl ester. The synthesis method comprises the following steps: reacting 5-bromomethyl-4-(4-fluorophenyl)-6-isopropyl-2-[methyl(methanesulfonyl)amino]pyrimidine with a substance A under the action of a first base catalyst to obtain a substance B; oxidizing the substance B with an oxidizing agent to obtain a substance C; then, reacting the substance C with tert-butyl (4R-Cis)-6-formyl-2,2-dimethyl-1,3-dioxane-4-acetate under the action of a second base catalyst to obtain a substance D; and finally, performing acid deprotection toobtain the rosuvastatin tert-butyl ester. The method disclosed by the invention is green and environment-friendly, mild and controllable in reaction condition, convenient and simple to operate, good in stereoselectivity and high in yield, and the prepared rosuvastatin tert-butyl ester is good in purity.