41results about How to "Large crystal particles" patented technology

The present invention relates to preparation process of hydrocarbon hydroprocessing catalyst, which has gamma-Al2O3 as carrier, VIB and VIII metal as the active component, and Ti, etc as the active assistant, with the assistant Ti being introduced in the pH swinging carbonization process for producing aluminum hydroxide. The process of preparing the catalyst is one complete mixing and kneading process including the steps of introducing Ti to aluminum hydroxide powder via adding Ti salt solution, adding Mo and/or W containing alkaline solution, mixing and kneading until the aluminum hydroxide powder is wetted completely by the alkaline solution, adding Co and/or Ni containing acid solution, mixing and kneading to obtain plastic material, extruding, drying, and roasting to obtain the catalyst. The catalyst has homogeneously distributed Ti component and obviously raised performance.

The invention belongs to the field of the chemical industry, and relates to a preparation method of large-particle crystal type high-bulk-density calcium 2-hydroxy-4-(methylthio)butyrate. The preparation method of the large-particle crystal type high-bulk-density calcium 2-hydroxy-4-(methylthio)butyrate comprises the following steps that 2-hydroxy-4-(methylthio)butyric acid, a calcium compound and a crystallizing agent are arranged in an aqueous medium, the pH is adjusted to be 5-7, the temperature is 60-80DEG C, stirring and full reactions are carried out, cooling crystallization is carried out to obtain calcium 2-hydroxy-4-(methylthio)butyrate crystals, separation is carried out to obtain crystals and coarse product mother liquid, and the crystals serve as calcium 2-hydroxy-4-(methylthio)butyrate coarse products. The calcium compound is one or more of calcium salt, calcium oxide and calcium hydroxide, and the use amount of the crystallizing agent is 50ppm-3000ppm of the mass of the 2-hydroxy-4-(methylthio)butyric acid. Materials produced through the preparation method of the large-particle crystal type high-bulk-density calcium 2-hydroxy-4-(methylthio)butyrate are high in purity, dehydration is easy, drying is rapid, crystal particles obtained after drying are large, good in mobility and large in bulk density, the amount of dust is low, glossiness is high, and the materials are more applicable to fodder.

The invention discloses a process method for preparing aglycon soybean isoflavone by performing acid hydrolysis with primary proportion soybean isoflavone as a raw material. The method comprises the following steps of: scattering the primary proportion soybean isoflavone into a low-concentration ethanol aqueous solution of which the weight is 10-30 times that of the primary proportion soybean isoflavone; keeping return flow agitation at a temperature of 70-90 DEG C; after the temperature keeps stable, adding inorganic acid in an amount of 0.2-2 percent of the mass of the solution; preserving heat and stirring for 3-10 hours; after a reaction stops, evaporating ethanol out of the solution; cooling to less than 0-10 DEG C; filtering and crystallizing; and washing with water to a neutral state so as to obtain the aglycon soybean isoflavone. The process is easy, convenient and practical, and has high transformation ratio, low cost, mechanical application of acid liquors and small environmental pollution.

The invention relates to a circulating typed mould. The invention contains a crystallization container and a cooling interlayer which is arranged around the crystallization container. A stirring rod is arranged inside the crystallization container. A liquid inlet and a liquid outlet are arranged on the crystallization container. A circulating pipeline is arranged between the liquid inlet and the liquid outlet. Middle pools of the water overflow port are arranged in turn on the circulating pipeline, which are used for storing high-level tank and condenser of crystal initial solution. A circulating pump is also arranged on the circulating pipeline. A crystal liquid outlet is arranged on the lower part of the crystallization container. The crystal liquid outlet is communicated with a crystal groove. The crystal groove has a mother liquor back-in-tank pipeline which is communicated with the crystallization container. A vacuum pump is arranged on the mother liquor back-in-tank pipeline. The mother liquid of the circulating typed mould circulates back into the crystallization container, which makes the invention has high efficiency and low energy consumption.

The invention relates to a preparation method of a 2-hydroxy-4-methylthio butyric acid metal chelate. The method comprises the following steps: performing a full reaction on hydrocyanic acid mixed gas prepared from an Andrussow method and methylthio propionaldehyde under the catalytic action of an alkali so as to obtain a 2-hydroxy-4-methylthio butyronitrile reaction system; performing a hydrolytic action on the 2-hydroxy-4-methylthio butyronitrile reaction system and sulfuric acid so as to obtain 2-hydroxy-4-methylthio butyric acid; adding an aqueous medium, a metallic compound and a crystallizing agent into the 2-hydroxy-4-methylthio butyric acid; regulating a pH value to reach 5 to 7 by using the alkali; heating to reach 60 DEG C to 90 DEG C; and performing cooling crystallization, thereby obtaining a 2-hydroxy-4-methylthio butyric acid metal chelate crystal. The method is low in production cost, wherein the obtained 2-hydroxy-4-methylthio butyric acid is easy to separate and purify, so that the 2-hydroxy-4-methylthio butyric acid with the high purity and the high yield can be obtained. Thus, the 2-hydroxy-4-methylthio butyric acid metal chelate which is further prepared from the 2-hydroxy-4-methylthio butyric acid has large crystalline particles.

The invention discloses a making method of titanium aluminium hydroxide, which is characterized by the following: introducing adjuvant titanium in the gelling course of aluminium hydroxide through shaking pH value reciprocally; dispersing titanium evenly on the surface of aluminium hydroxide; enlarging the most probable aperture of titanium aluminium hydroxide.

The invention discloses a structure of a film transistor and a manufacturing method. The method includes at providing a base board, a grating electrode is formed on the base board, and a grating electrode dielectric layer covers the grating electrode and the base board; the, carries on ion injection step to the grating electrode dielectric layer; and forms a semi-conductor on the grating electrode dielectric layer after the injection.

The present invention relates to a desulfurization catalyst of a limestone-gypsum wet coal-fired boiler flue gas desulfurization process. The desulfurization catalyst comprises the following raw materials, by weight: 78-85% of CH3COONH4, 12-20% of NH4C1, 0.3-1% of alcohol polyoxyethylene ether phosphoric monoester, 0.5-1.5% of alkyl alcohol ether carboxylate, and 0.3-1% of fatty alcohol ethyl oxide. The desulfurization catalyst has the following beneficial effects that: desulfurization efficiency of the limestone-gypsum wet coal-fired boiler flue gas desulfurization (FGD) process is economically and effectively improved, a SO2 pollutant emission concentration is reduced, a SO2 pollutant emission concentration of the coal-fired boiler achieves requirements of the newly revised emission standard of air pollutants for thermal power plants (GB13223-2011) (hereinafter short for new standard), and environment protection is achieved.

The invention belongs to the field of chemical synthesis, and relates to a preparation method of dihydroxy oxethyl fluorine. The method comprises the following steps of: executing condensation reaction of ethylene glycol monophenyl ether and 9-fluorenone in the presence of catalyst mercaptoethanol, extracting and purifying the reaction liquid by water-organic solvent, and then, obtaining the target product after recrystallization. With the preparation method provided by the invention, the reaction time is reduced, the yield is improved, the crystal form and the liquidity of products are improved, the solvent of a single type is more beneficial for recycling, and the technical operation is simplified, so that the preparation method is suitable for industrial production.

The invention relates to a system and a method for desulfurization and magnesium sulfate heptahydrate co-production by using magnesium oxide. The system comprises an absorption tower, a slurry preparation device used for preparing magnesium hydroxide slurry, an oxidization device, a filter-press device used for filtering the slurry obtained after a reaction is finished, and a by-product preparation device, wherein a flue gas outlet is formed in the top of the absorption tower, an absorption tower flue gas inlet is formed in one side of the lower part of the absorption tower, and an absorbed slurry outlet is formed in the bottom of the absorption tower; a tower top chimney, an absorption tower demisting area, an absorption tower spray reaction area and an absorption tower slurry area are sequentially arranged in the absorption tower from top to bottom; the absorption tower demisting area is provided with a demister, and the absorption tower spray reaction area is provided with a spray head; the slurry preparation device is communicated with the absorption tower slurry area by a pipeline; the oxidization device is communicated with the absorption tower; the filter-press device is communicated with the absorbed slurry outlet; an inlet of the by-product preparation device is communicated with the filter-press device. A cooling crystallizer is adopted by the by-product preparation device, so that the system has the advantages of being large in particles of a prepared product, easy in separation of the product, high in product quality, low in load of separation and drying unit equipment, easy to operate, and the like.

The invention relates to a method for recycling DL-lysine hydrochloride from aspirin-DL-lysine mother liquor, comprising the steps of: evaporating out ethanol, adding hydrochloric acid for separation and precipitation, concentrating filtrate and separating out crystals. The method disclosed by the invention has the advantages of simplicity and high product purity, and the recycled DL-lysine hydrochloride can be used as an intermediate for further synthesis of aspirin-DL-lysine, therefore, the production cost is greatly saved and reduced, the difficulty in waste water treatment and environmental pollution are simultaneously reduced, and the economic and social benefits are improved.

The invention relates to a method for recycling washing water and coproducing a magnesium ammonium fertilizer during carbonization-process magnesium oxide production. The method comprises the following steps: hydrocyclone separation, activated carbon adsorption, plate and frame filter and other liquid-solid separation processes are utilized to remove solid matters in the washing water; two-stage reverse osmosis membrane filtration is utilized to concentrate the washing water; a mechanical compression heat pump evaporation technique is adopted to perform further evaporative concentration; purified water with very low total salt content obtained in the concentration process is recycled to the production system as process water; and the concentrated solution generates a large-granule ammonium sulfate magnesium fertilizer in a crystallization aging device, and the large-granule ammonium sulfate magnesium fertilizer is subjected to centrifugal separation, packaging and the like to obtain the ammonium sulfate magnesium fertilizer byproduct. In the washing water recycling process, the ammonium magnesium fertilizer byproduct is obtained, thereby being beneficial to implementing wastewater zero discharge in the medical magnesium oxide production process, and achieving the goal of changing wastes into valuable substances.