42results about How to "Avoid mass generation" patented technology

The invention discloses clopidogrel bisulfate crystal particles with the median particle diameter of at least 120 microns. The invention also discloses a method for preparing the crystal particles, a pharmaceutical composition containing the crystal particles and a preparation method of the pharmaceutical composition.

The invention relates to a down draft kiln, consisting of a furnace body (2), a furnace door (1), a fuel nozzle (3), a hearth (22) and smoke and air exit and entrance (5). The down draft kiln is characterized in that the furnace body (2) consists of a refractory brick layer (6), a thermal protective coating (7), an insulating layer (8) and a shell (9). The smoke and air exit and entrance (5) are arranged at the two sides of the bottom of the furnace body (1) and are internally provided with heat accumulators (10), and the fuel nozzle (3) is arranged above the smoke and air exit and entrance (5) and at the lower part of the furnace body (2). A fire absorbing hole (11) is positioned in the hearth (22) and between the smoke and air exist and entrance (5) and the fuel nozzle (3), a retaining wall (12) is arranged below the fire absorbing hole (11) to divide the smoke and air exist and entrance (5) at the two sides into two parts, and the top of the furnace body (2) is provided with a temperature measuring hole (4). The invention has the advantages of energy source saving, high heat utilization rate and environment protection.

The invention provides a high-dispersion particle catalyst applied to synthesis of hydrogen peroxide as well as a preparation method and application thereof. The preparation method of the catalyst is characterized by taking one or combination of two of noble metals Pd and Pt as a main active component, loading the main active component on a composite carrier prepared from AlPO series, SAPO series, silicon zincate molecular sieves, phosphates and oxides to prepare the catalyst. The catalyst carrier has a micropore-mesopore compounded hierarchical porous structure; through micropores, the dispersity of active metals and the spillover of hydrogen atoms can be improved, so that the hydrogenation activity of the catalyst, and the consumption of the noble metals is reduced; through mesopores, diffusion channels are provided for reactants and products, so that the mass transfer in the pores is facilitated, the mass production of byproducts is effectively avoided, and then the selectivity of the catalyst is improved; in addition, the composite carrier is easy to modify; acidity and alkalinity can be regulated; the performance of the catalyst can be further improved.

The invention discloses a method for preparing 3, 4-difluorobenzaldehyde, and relates to the technical field of organic synthesis. The method includes carrying out Grignard exchange reaction on 3, 4-difluoro bromobenzene, tetrahydrofuran and a Grignard reagent to obtain first reaction products; carrying out reaction on the first reaction products and N, N-dimethylformamide to obtain second reaction products; treating the second reaction products to obtain the 3, 4-difluorobenzaldehyde. The 3, 4-difluoro bromobenzene is used as a raw material, and the tetrahydrofuran is used as a solvent. The method has the advantages that the Grignard exchange reaction is carried out on the 3, 4-difluoro bromobenzene and the freshly prepared Grignard reagent which is isopropylmagnesium chloride, and accordingly the problem of large quantities of generated byproducts due to excessively high reaction temperatures when 3, 4-difluoro bromobenzene and a Grignard reagent which is metal magnesium can be solved; the reaction is carried out on the N, N-dimethylformamide and the products already subjected to Grignard exchange, so that the 3, 4-difluorobenzaldehyde can be prepared, and the reaction yield can be increased.

The invention relates to a synthesis method of an alkenyl borate compound, which comprises the following steps: dissolving an olefin compound and a borane compound in a solvent, adding a zirconium catalyst, reacting at 0-150 DEG C for 5 minutes to 8 hours in a protective atmosphere, and separating to obtain the alkenyl borate compound. The method is simple and convenient to operate, low in cost, high in reaction atom economy and suitable for industrial production.

The invention discloses a flange manufacturing technology. The technology comprises the steps of raw material thick-wall steel pipe re-inspection, forming of pipe blanks through cutting, heating, forging through a punch press, heat treatment, cutting and drilling, and marking and packaging. Thick-wall steel pipes serve as raw materials, and flange finished products are obtained after cutting, heating and forging, heat treatment, cutting and drilling. Compared with a traditional flange manufacturing technology, the technology remarkably improves the yield of the raw materials, greatly reduces generation of waste, effectively reduces the turning workload, prolongs the service life of a lathe cutter, and helps flange production enterprises to improve economic benefits.

The invention belongs to the technical field of organic synthesis, and specifically relates to a high-yield preparation method of a high-purity dimethyl diallyl ammonium chloride monomer. According tothe preparation method provided by the invention, a segmented type chloropropene and sodium hydroxide solution alternative and dropwise adding method is adopted, the most suitable alternative and dropwise adding amount and the most suitable reaction time of the chloropropene and the sodium hydroxide solution can be found through a large amount of small-scale tests and by adopting an acid-base indicator, the chloropropene can be prevented from being located in strong base environment, a large amount of byproducts such as allyl alcohol can be effectively prevented from being generated, the utilization rate of the chloropropene can be effectively increased, and by adopting a pressure-proof closed reaction kettle, dimethylamine is enabled not to leak and can completely take part in reaction.A dimethyl diallyl ammonium chloride monomer solution obtained through the preparation method is light in color and less in impurities, activated carbon is not used for decoloring and removing the impurities, the purity is high, the contents of amine salt and chlorine ions are extremely low, the yield is approximate to ideal value, a product is used for homopolymerization experiments, a colorless,transparent and clear polymer solution is obtained, and the viscosity and the molecular weight of the colorless, transparent and clear polymer solution are far higher than those of like products.

The invention belongs to the field of battery materials, and particularly relates to a preparation method of a metal-carbon composite negative electrode material; the preparation method comprises thesteps of mixing bituminous coal with a metal source to obtain a mixture; and sequentially performing first-stage sintering, second-stage sintering and third-stage sintering on the mixture to obtain the composite negative electrodes material, wherein the sintering temperature is 300 DEG C or below in the first-stage sintering; the sintering temperature is 400-600 DEG C in the second-stage sintering; and the sintering temperature is 700-1,200 DEG C in the third-stage sintering. The invention also discloses the negative electrode material prepared by adopting the preparation method and an application of the negative electrode material in preparation of a negative electrode of a lithium ion battery. According to the method, bituminous coal is creatively adopted as a raw material; and the raw material is matched with the metal source, and the battery negative electrode material with excellent electrical property can be prepared under the special three-stage sintering mechanism.

The invention provides a fly ash sulfur fixation melting harmless treatment method. The method comprises the following steps that fly ash, a reducing agent and flux are mixed to obtain a mixed raw material, wherein the molar ratio of C to S in the mixed raw material is 2.5 to 3.5; the slag type is controlled to be an SiO2-Al2O3-CaO slag type, and m/n is 0.8 to 1.5; or the slag type is controlled to be an SiO2-CaO-FeO slag type, m/n is 1.0 to 1.6, and l/m is 0.15 to 0.30; the mixed raw material is fed into an electric furnace in a blowing mode or a pressed material ball mode to be subjected to sulfur fixation melting, the temperature of a slag layer is controlled to range from 1250 DEG C to 1350 DEG C in the period, the temperature of a molten salt layer on the top of the slag layer is controlled to be smaller than 1200 DEG C, and molten salt, slag and exhaust gas are obtained; the molten salt is cooled, and the slag is subjected to water cooling or air cooling; and the exhaust gas is treated through one of three modes. According to the method, a systematic solution is provided for fly ash treatment in the aspects of material blending, sulfur fixation melting, exhaust gas treatment and the like, and the maximum harmless treatment is achieved.

The invention relates to a coupling bionic double-turbine hydraulic torque converter. The coupling bionic double-turbine hydraulic torque converter comprises a pump wheel, a pump wheel outer ring, a pump wheel inner ring, a first turbine, a guide wheel and a second turbine. Vanes of the pump wheel are bionic wheels. The polynomial of the circular rector distribution function of the pump wheel is y=ax4+bx3+cx2+dx+e, wherein x is the transverse coordinate of each equal diversion point on an arc line, y is the corresponding circular rector distribution value, 3.0619<=a<=6.0894, -6.0787<=b<=-3.8151, -0.406<=c<=0.0147, -0.1814<=d<=0.4725, and 0.5972<=e<=1.5149. The vanes of the pump wheel are bionic wheels. Compared with a traditional common double-turbine hydraulic torque converter, the starting torque ratio and efficiency are increased, and the capacity factor of the pump wheel is larger than that of a hydraulic torque converter with common vanes.

The invention discloses a preparation method of aluminum acetylacetonate, which comprises the following steps: 1) in a reactor, mixing aluminum powder with C1-C3 low-grade fatty alcohol, and adding organic acid to adjust the pH value to 2-4.5; 2) adding acetylacetone for reaction, and then adding alkali liquor to adjust the pH value to 6-7; and 3) filtering the product obtained in the step 2), andwashing and drying the filter residue to obtain the aluminum acetylacetonate. The method is free of water as a solvent, reduces the generation of wastewater, promotes the reaction by a small amount of organic acid as a pH value regulator, improves the utilization rate of the raw material acetylacetone, achieves the cyclic utilization of the solvent, and saves the cost.