92results about How to "Fewer post-processing steps" patented technology

The invention relates to the technical field of hydrofluoroester production and particularly relates to a clean production method for hydrofluoroester. The method is as follows: adding fluorine-containing sodium alkoxide catalyst into fluorine-containing alcohol liquor, adding fluorinated olefin, heating and stirring for reacting to obtain mixed liquor; carrying out after-treatment onto the mixed liquor to obtain hydrofluoroester, wherein the fluorine-containing sodium alkoxide catalyst is sodium trifluoroalkoxide, and the corresponding fluorine-containing alcohol is trifluoroalcohol or pentafluoroalcohol. The catalyst used by the method is fluorine-containing alkanol liquor of the fluorine-containing sodium alkoxide, and the fluorine-containing sodium alkoxide is one of reaction materials, so that any other solvent is not needed to be added, and therefore, separation of the solvent and reaction products is avoided, after-treatment steps are reduced, production cost is saved, reaction yield is high, product purity is high, and economic benefits are very high.

The invention discloses preparation and application of 4-chlorine-3-ethyl-1-methyl-N'-(2-substituted phenoxy acetyl)-1H-pyrazol-5-carbohydrazide compounds. The preparation comprises the following steps: carrying out backflow reaction on thionyl chloride and N-methyl-3-ethyl-4-chloride pyrazole carboxylic acid for 1h to obtain a compound (II), putting the mixed liquor of a compound (III), an organic solvent and an acid-binding agent in a round-bottom flask, dropwise adding the compound (II) at 20-30 DEG C while stirring, then heating up to backflow reaction, carrying out TLC tracing until the raw materials are completely reacted, stopping the reaction, respectively extracting by using 50ml of water twice, drying the organic layer by anhydrous NaSO4, evaporating out the solvent under reduced pressure, and carrying out recrystallization to obtain the target compound shown in the formula (I). According to the preparation and the application, the reaction conditions are mild, the postprocessing is convenient and the total yield of the reaction is as high as 81%; and the compound has a herbicidal activity, thus laying a foundation for the research and development of new pesticides.

The objective of the invention is to provide a machined carbon-fiber-reinforced resin product with minimal flashes and almost none of the problems described above that occur on a surface machined by trimming, cutting, or the like, said resin product having an end face with satisfactory surface texture, and excellent surface properties, in particular smoothness. The invention provides a machined carbon-fiber-reinforced resin product containing carbon fibers and a resin and having an end face, wherein the end face has a surface roughness (Rz) in the range of 5 [mu]m to 50 [mu]m inclusive.

The invention provides a method for processing microalgae. The processing method includes placing microalgae liquid in an environment with a normal temperature and pressure, increasing the temperature and pressure of the environment of the microalgae liquid, continuously subjecting the microalgae liquid to the environment after the temperature and pressure are increased, and directly transferring the microalgae liquid to a vacuum environment from the environment. The invention further provides a device for preparing the microalgae, which includes a microalgae liquid storage tank used for storing the microalgae liquid at the normal temperature and under the normal pressure, a high-pressure pump used for pressurizing the microalgae liquid storage tank, a heater used for heating the microalgae liquid storage tank, a vacuum container with a vacuum pump, which is empty inside and used for containing the microalgae liquid obtained from the microalgae liquid storage tank, and a buffer tank used for containing water discharged from the vacuum container. According to the method and the device for processing microalgae, the collecting, wall-breaking and drying of the microalgae are achieved simultaneously or performed by one step and the extraction rate of microalgae oil after wall-breaking can be reached above 90%. The method and the device for processing microalgae have the advantages of simple process, high wall-breaking efficiency, low energy consumption, and the like.

The invention discloses a preparation method of ciprofloxacin hydrochloride. The existing synthesis method generally uses isoamyl alcohol and the like as solvent, thus having the problems of strong smell, difficult biodegradation and higher environmental pollution. If the solvent such as the isoamyl alcohol and the like is used, more alkali insoluble substances and acidic insoluble substances are generated in recovery after the reaction, so that the insoluble substances are needed to be treated by purification through the steps such as alkali-dissolving heat-filtering call-back throw filter, acidic-dissolving heat-filtering call-back throw filter, salifying decoloration heat-filtering and the like, the process route is longer, and the product yield is lower. The preparation method of the ciprofloxacin hydrochloride selects the proper solvent as reaction medium, firstly leads cyclopropane carboxylic acid and piperazine to have piperazine reduction reaction and then leads the reaction product to be salified together with hydrochloric acid. In the reaction process, less alkali insoluble substances and acidic insoluble substances are generated in the reaction process, and the ciprofloxacin hydrochloride can be obtained by salifying decoloration heat-filtering, separation by crystallization, throw filter, rinsing and drying after being directly cooled and leached, so that the time for occupying equipment and the time of working procedures are shortened, and the production efficiency of a workshop is improved.

The invention discloses a micro-electromechanical structure and a manufacturing method thereof. In the invention, the micro-electromechanical structure comprises a substrate and at least one suspending microstructure which is positioned on the substrate. The suspending microstructure comprises multiple metal players, at least one dielectric layer and at last one edge metal wall, wherein the dielectric layer is clamped between the metal layers and the edge metal wall is parallel to the thickness direction of the suspending microstructure and surrounds the edge of the dielectric layer. The edge metal wall can resist etching liquid erosion of the dielectric layer in the process and the structure that the metal layers are compounded with the dielectric layer can increase the structural strength of the suspending microstructure in the thickness direction.

The invention discloses a method for preparing an amino acid derivative by using a photocatalysis micro-channel. The method comprises the following steps: (1) dissolving a cysteine derivative and a diazonium acid ester compound in a solvent to prepare a homogeneous solution; (2) pumping the homogeneous solution prepared in the step (1) into a micro-reactor in a micro-channel reaction device provided with a light source for a reaction; and (3) collecting effluent of the microreactor to obtain the amino acid derivative. The reaction involved in the invention is a novel method for synthesizing the amino acid derivative, and the method does not need a homogeneous system added with a catalyst and other additives, and has good applicability to ortho-substituted diazonium acid ester, meta-substituted diazonium acid ester and para-substituted diazonium acid ester.

The invention discloses a surface-exposure-based multi-degree-of-freedom 3D printing method, and relates to the technical field of 3D printing. The method solves the technical problem that a support needs to be additionally arranged during workpiece manufacturing and then consumables are increased. The method comprises the following steps that firstly, a triangular patch on the surface of a printing model is partitioned, the triangular patch in the area is normalized to obtain an outer normal vector of the area face, and the area face and the corresponding outer normal vector are put into an area set; and then, the candidate substrate intersection surface and parameters of the printing model are searched, and based on the candidate substrate intersection surface and the area set, the cutting surface is found so that the printing model can carry out unsupported printing by taking the candidate substrate intersection surface and the cutting surface as the bottom. The invention further discloses a surface-exposure-based multi-degree-of-freedom 3D printing device and system. According to the printing method, device and system, support is not needed to be additionally arranged, so thatthe product quality is improved while consumables are reduced. The manufacturing direction variability improves the flexibility of the slicing direction, the number of slicing layers is increased, andthe fine degree of the model is also improved.

The invention discloses a high-performance adsorption material and a preparation method thereof. A hierarchical-pore nitrogen doped carbon / MgO composite microsphere material is prepared by performing a high-temperature thermal treatment carbonization method on polyimide serving as a carbon and nitrogen source, polyurethane foam serving as a macroporous scaffold and metal magnesium salt serving as an additive. According to the high-performance adsorption material and the preparation method thereof, the use of an expensive template agent and a toxic raw material reagent is avoided; the prepared composite microsphere material has an ideal flower-shaped spherical appearance, is of a hierarchical-pore structure with micro holes and macro holes, has controllable surface characteristics, excellent structural stability, high nitrogen content and magnesium content, and shows high adsorption volume and excellent circulating stability when used as a CO2 adsorption material. The preparation method disclosed by the invention is simple and feasible; the process is controllable, and the reaction time is short; furthermore, no complicated experimental equipment and complicated experimental steps are needed; and the industrial large-scale production is facilitated.

The preparation process of the solid component of olefin polymerizing catalyst includes first reaction of C2-C8 alcohol and magnesium powder in the molar ratio of 2.0-4.0 in the presence of methane halide to form homogeneous magnesium ligand solution; subsequent addition of electron donor compound to form homogeneous solution and the reaction between the solution with titanium compound to form Mg-Ti ligand solution; the contact reaction between the solution with inorganic oxide carrier to prepare solid catalyst precursor; and final activation of the precursor with alkyl aluminum chloride to obtain the solid catalyst. The solid component of catalyst of the present invention is matched with alkyl aluminum for the polymerization of ethylene and has high catalytic activity and polymer prepared with very small amount of fine powder.

The invention belongs to the field of herbicides and particularly relates to a synthetic method of s-metolachlor. The synthetic method of s-metolachlor comprises the steps that a cheap compound 2-methyl-6 ethyl benzene easy to obtain is used as a raw material, and finally the high-quality herbicide product s-metolachlor is obtained through condensation reaction, catalytic hydrogenation reduction reaction, chloride acetylation reaction and purification treatment. The simple water-phase s-metolachlor synthesis method easy to execute is provided, the yield of the s-metolachlor product reaches 98.5% and the purity reaches 98.2% in a kilogram-level experiment, and the environment-friendly synthesis method is suitable for industrial production. In addition, compared with a traditional organic solvent synthesis method, use of organic alkali is avoided, few post-treatment steps are adopted, the production pollution is low, the cost is low, required material types are few, the solvent use amount is small, the cost is low, and the method is suitable for large-scale popularization and use.

The invention discloses a preparation method of dapagliflozin. The preparation method comprises the following steps: (1) reacting a compound solution as shown in a formula II and an n-butyllithium solution in a first microreactor in a microchannel reaction device; (2) reacting effluent of the first microreactor with a compound as shown in a formula III in a second microreactor in the microchannel reaction device to obtain a compound as shown in a formula IV; (3) carrying out reduction reaction on the compound shown in the formula IV in a third microreactor in the microchannel reaction device to obtain a compound shown in a formula V; and (4) deprotecting the compound as shown in the formula V to obtain dapagliflozin as shown in the formula I. According to the method disclosed by the invention, benzyl-protected glucolactone is adopted as a starting raw material, so that generation and multiple derivatization of isomer impurities and ring-opening impurities are avoided, the stereoselectivity is relatively high, and post-treatment steps and waste generation are reduced; and meanwhile, the yield is high, the purity is high, the synthesis steps are few, the operation is simple and convenient, and the safety is high.

The invention provides an acidic waste gas treatment device and belongs to the technical field of gas treatment equipment. The acidic waste gas treatment device comprises a liquid storage tank, a first gas-liquid mixer and a conveying pump, wherein the first gas-liquid mixer is provided with a first mixing chamber, a first liquid inlet, a first liquid outlet and a first gas inlet for inputting the acidic waste gas; the first gas inlet, the first liquid inlet and the first liquid outlet are all communicated with the first mixing chamber; a first input hole and a first output hole are formed on the liquid storage tank; an input end of the conveying pump is connected with the first output hole; an output end of the conveying pump is connected with the first liquid inlet; the first liquid outlet is connected with the first input hole. The acidic waste gas treatment device is simple in structure, small in volume, low in use cost and capable of reducing the discharge index and processing cost of the acidic waste gas.

The invention belongs to the field of medicament processing and particularly relates to a process for synthesizing a triazole derivative. The process has the advantages that the raw materials are easily available, time consumption is low, reaction conditions are mild and yield is high. According to the technical scheme, the process comprises the following steps: adding formamide to a four-necked flask which contains a stirrer, a constant-pressure dropping funnel, a distillation device and a tail-gas absorption device; heating to a temperature of 175-190 DEG C; dropwise adding hydrazine hydrate for 0.5-2.5 hours, wherein the molar ratio of formamide to hydrazine hydrate is 1:(1.1-2); introducing the escaping ammonia into an absorption bottle filled with 20-30% H2SO4; preserving heat for 0.5-2.5 hours after finishing adding dropwise; cooling and filtering after a large amount of crystals are separated, to obtain a crude product; washing the crude product by ethyl acetate to obtain the target product which is 1H-1,2,4-triazol; calculating the yield; and measuring the melting point.

The invention relates to a preparation method of hydrofluoride ether, and particularly relates to a method for preparing 1,1,2,2-tetrachlorofluoroethyl-2,2,3,3-tetrachlorofluoropropyl ether. The method comprises the following steps: with tetrachlorofluoropropyl alcohol as an initial raw material and sodium tetrachlorofluoro-propoxide as a catalyst, reacting with a tetrafluoroethylene monomer, and carrying out after treatment on reaction products to obtain the 1,1,2,2-tetrachlorofluoroethyl-2,2,3,3-tetrachlorofluoropropyl ether. The catalyst used by the method is a tetrachlorofluoropropyl alcohol solution containing the sodium tetrachlorofluoro-propoxide, while the tetrachlorofluoropropyl alcohol is also one of the reaction raw materials, so any other solvents need not to be added so as to avoid separation of the solvent and the reaction products, reduce the after treatment steps and lower the production cost; by using the sodium tetrachlorofluoro-propoxide as the catalyst, the product yield is high and the purity is high.