47results about How to "Wide range of reaction conditions" patented technology

The invention belongs to the technical field of graphene preparation, and in particular relates to a preparation method of graphene material based on the principle of solid-phase mechanochemical reaction. The technical solution of the present invention is to use the three-dimensional strong shear structure of the solid-phase mechanochemical reactor to introduce grinding aids in the process of grinding graphite, and the three-dimensional shear force induced by the three-dimensional shear structure makes the grinding aids and graphite strongly The frictional interaction of graphite exfoliates to prepare single-layer or few-layer graphene. The method of the present invention is to dry the graphite and the grinding aid separately, add them to a mixer and mix them evenly, move them into a solid-phase mechanochemical reactor for grinding, remove the grinding aids and impurity ions, and dry at a temperature of 60-90°C to obtain A high-performance graphene material with less than 8 layers and few base defects. The new method for preparing the graphene material of the present invention has the characteristics of simplicity, high efficiency, cleanliness and low cost, and the prepared graphene material has few substrate defects, and the surface functionalization of the graphene can be realized in one step.

The invention discloses a preparation method of a cationic-dye composite adsorbing material and application. The preparation method comprises the following steps of: adopting partially-neutralized acrylic acid and acrylamide as functional monomers, adopting montmorillonite as a filling agent, adopting N,N' methylene bisacrylamide as a crosslinking agent, adopting ammonium persulfate as an initiator, adopting sodium hydrogen sulfite as a coagulant aid, and adopting water as a medium, synthesizing into poly(acrylic acrylamide) / montmorillonite composite hydrogel by free-radical polymerization, i.e., the cationic-dye composite adsorbing material. The composite adsorbing material has the beneficial effect that the cationic dyes such as methylene blue can be effectively adsorbed to achieve thepurpose of reasonably treating sewage; the preparation method is simple in synthesis process, controllable in material cost, convenient in solid-liquid separation and wide in application range, is a method with a wide application prospect and can meet the need of sewage treatment with rapid development.

The invention discloses a method for synthesizing a graphene film through chemical reaction. Through a chemical reaction between a gaseous carbon source, a solid carbon source and a liquid carbon source containing carbon elements or the mixed carbon source material of any two or more of the carbon sources and a chemical reacting substance, carbon atoms in the carbon source material are activated and then deposit on a substrate to grow a graphene film. The method disclosed by the invention is characterized in that the method for producing carbon atoms for synthesizing a graphene film is different from conventional methods such as chemical vapor deposition, the carbon source material for synthesizing a graphene film is widely available, and the synthesis of the graphene film is not restricted by the substrate; the structure and size of the grown graphene film are easy to control; and the method is suitable for preparing graphene films in large scale.

The invention discloses a method for synthesizing 7-chloro-2-oxoheptanoate, which comprises: dissolving ethyl pyruvate in an organic solvent, adding alkali and 1-bromo-4-chlorobutane in turn, and performing a condensation reaction; filtering the product of the reaction, removing solvent from filtrate by reduced-pressure distillation; purifying by distillation; and thus, obtaining 7-chloro-2-oxoheptanoate. In the invention, nontoxic and cheap ethyl pyruvate is used as a main raw material and subjected to one-step condensation reaction with 1-bromo-4-chlorobutane under the action of alkali to form the 7-chloro-2-oxoheptanoate, and the yield of the product reaches 88 to 98 percent. The synthesis method disclosed by the invention has the advantages of high product yield, simple steps, wide reaction conditions, low cost, environment friendliness and the like and is suitable for large-scale industrial production.

The invention discloses a high-concentration nitrobenzene wastewater pretreatment device and treatment method, belonging to the field of organic chemical industry wastewater treatment. The device and method solve the problems of high pretreatment difficulty, low treatment efficiency, high treatment cost, complex operation and the like in the existing high-concentration nitrobenzene wastewater treatment method. The pretreatment device is sequentially composed of a pH regulating tank, an integrated complete-mixing zero-valent iron reaction tank, a Fenton-like reaction tank and a flocculating settling tank. The integrated complete-mixing zero-valent iron reaction tank has high reduction treatment capacity for nondegradable organic matters, can not harden after long-term operation, and has the advantages of wide pH value range, low iron powder consumption, lower operating cost and simple operation. The Fenton-like reaction tank performs Fenton oxidation by utilizing Fe<2+> and H2O2 which are dissolved out by the integrated complete-mixing catalytic zero-valent iron reduction reaction, thereby lowering the pollutant concentration under economical conditions. Thus, the high-concentration nitrobenzene wastewater pretreatment method has the advantages of favorable treatment effect and lower operating cost, is simple to operate, and can stably satisfy the subsequent biochemical treatment requirements.

The present invention provides a kind of preparation method of synthetic gas aromatic hydrocarbon composite catalyst, core-shell Fe 3 o 4 @MnO 2 Physically mix with hollow HZSM-5 zeolite at a mass ratio of 1:0.5-5 to obtain a composite catalyst. The preparation process of the catalyst of the present invention is simple, and can be applied to large-scale industrial production; under the premise of high reactivity, it has high selectivity of aromatic hydrocarbons, and the catalyst has excellent stability; the range of applicable reaction conditions is large, and it has the advantages of Good prospects for industrial application.

A preparing method for phase transited stored energy microcapsule covered with an organic polymer material adopts the following steps: (1) mixing the 10 weight organic phase transited material and 0.5-2.5 weight nonionic surfactant under the condition of heating and blending; (2) picking the organic polymer material monomer A, B 2-3 weight to add to 40-60 weight water, blending and mixing as the water phase; (3) adding the oil phase to the water phase, blending the material as the creaming liquid at 30-50 centigrade, adding the free radical to the initiator for the poly-reaction 1-8h at 35-90centigrade; then adjusting the low temperature as blending the material and adding the cross linker, filtering, washing and drying to obtain the finished products. The organic polymer material achieves the phase transited capsule envelopment via the creaming polymer reaction of the wall material; the microcapsule is the spherical; the granule is distributed evenly; the polymer wall material has astable intensity, great tightness and great mechanical performance.

The invention relates to an enzymatic hydrolysis product of total flavonoids of Epimedium, which is produced by enzymatic hydrolysis of total flavonoids of Epimedium through immobilized snail enzymes, and the enzymatic hydrolysis product has higher Better anti-tumor activity and better oral absorption. The invention also discloses a preparation method of the enzymatic hydrolysis product. The method uses immobilized enzymes to enzymolyze the total flavonoids of Epimedium herba, and the selected helicase has high binding efficiency, good stability, and high enzymatic hydrolysis conversion rate with the immobilized carrier. Moreover, the immobilized enzyme can also be recycled, which can save resources and realize green production. The present invention also relates to the application of the enzymatic hydrolyzate in anti-tumor. The total flavonoid enzymatic hydrolyzate of Epimedium herba obtained according to the technical scheme provided by the present invention is effective against human lung cancer A549 cells, liver cancer HepG2 cells, breast cancer MCF‑7 cells, cervical cancer Hela cells have significant proliferation inhibitory effect and can be used for the treatment of lung cancer, liver cancer, breast cancer and cervical cancer.

The invention relates to a melt / solid state polycondensation preparation method for polylactic acid, which mainly solves the problems of long reaction time, difficult continuous production or high cost in the prior art. The method comprises the following steps of: 1) performing a dehydration oligomerization reaction of lactic acid at the temperature of between 100 and 160 DEG C under the absolutepressure of between 6,000 and 25,000 Pa and under the action of a catalyst A for 0.5 to 5 hours first, and continuing the ehydration oligomerization reaction at the temperature of between of 120 and 180 DEG C under the absolute pressure of between 200 and 1,500 Pa and under the action of the catalyst A for 0.5 to 5 hours to generate a product I; 2) performing a melt polycondensation reaction of the product I at the reaction temperature of between 150 and 200 DEG C under the absolute pressure of between 30 and 600 Pa and under the action of a catalyst B for 0.5 to 15 hours to generate a polylactic acid prepolymer and lactide serving as a by-product, and refluxing the lactide to a reaction mixture at the reflux temperature of between 70 and 95 DEG C; 3) pelletizing the polylactic acid prepolymer obtained in the step 2), and crystallizing in an inertia airflow at the temperature of between 50 and 130 DEG C for 0.5 to 10 hours; and 4) performing a solid state polycondensation reaction of the polylactic acid prepolymer processed in the step 3) in the inertia airflow at the temperature of between 120 and 170 DEG C for 5 to 40 hours to obtain the polylactic acid. The technical scheme of the invention better solves the problem, and can be used for the industrial production of the polylactic acid.

The invention relates to a method for removing impurities from desulphurization gypsum of a power plant. The invention adopts a reversible conversion principle that dihydrate gypsum can be rapidly dissolved, re-crystallized and converted into alpha-hemihydrate gypsum under the conditions that temperature is higher than or equal to 120 DEG C, pressure is higher than or equal to 0.15MPa, a pH value is 2.5-7 and an additive exists, and the alpha-hemihydrate gypsum can be also rapidly converted into dihydrate gypsum when being cooled in a water environment. The method for removing the impurities from the desulphurization gypsum of the power plant comprises the following steps: sieving a raw material for filtering out large-particle impurities; preparing reaction slurry, and carrying out water type hot pressing reaction, so that dihydrate gypsum is rapidly converted into alpha-hemihydrate gypsum; standing, and cooling, wherein alpha-hemihydrate gypsum in the slurry is converted into relatively large dihydrate gypsum particles; removing impurities to obtain a relatively pure gypsum material; carrying out water filtration to further remove small impurity particles and harmful soluble salt in gypsum; and obtaining slurry and a wet body or drying to obtain powder according to follow-up needs. The method for removing the impurities from the desulphurization gypsum of the power plant can be taken as a gypsum raw material purification process in preparation of calcium sulphate whiskers by virtue of the desulphurization gypsum, and can also be taken as a method for producing high-whiteness gypsum. The method for removing the impurities from the desulphurization gypsum of the power plant is simple, efficient and easy for mass production.

The invention belongs to the field of preparation of catalyst materials, and in particular relates to a regularly coordinated cobalt or iron-doped cobalt-based electrocatalyst and its preparation method and application. The electrocatalyst is a crystalline material, which belongs to a simple cubic crystal system. The eight vertices of the unit cell are cobalt or isomorphously substituted iron, and the metal atoms are in a 6-coordination structure, which is connected by its ligand cyanide (-CN) , that is, each side of the unit cell is connected to the cyano group formed by C and N, the unit cell parameter is α=β=γ=90°, and the crystal can present a monodisperse regular cube, Truncated cubic or octahedral morphology. The catalyst has excellent crystallinity, regular and single coordination, has a single-site active center, and the reaction site is clear and definite, which can be used for the study of crystal face-dependent catalytic activity. The catalyst has excellent catalytic activity and stability as a working electrode for oxygen reduction, oxygen evolution, hydrazine hydrate oxidation, metal-air battery and hydrazine hydrate fuel cell.