34results about How to "Wide range of process conditions" patented technology

The invention relates to a method for preparing anhydrous magnesium chloride from bischofite, which uses the bischofite as a raw material for preparing the anhydrous magnesium chloride. The method comprises the following technical processes: (1) firstly, drying the bischofite for dewatering most crystallization water; (2) dissolving the dried magnesium chloride in glycol for preparing a glycol solution of the magnesium chloride and using a vacuum distillation method for dewatering water in the glycol solution of the magnesium chloride; (3) reacting the dewatered glycol solution of the magnesium chloride with ammonia for crystallizing so as to generate magnesium chloride hexammoniate crystals; (4) washing, filtering and drying for obtaining the magnesium chloride hexammoniate crystals; and (5) heating, decomposing and deaminating the dried magnesium chloride hexammoniate crystals for preparing the anhydrous magnesium chloride. In each process, ammonia gas, detergent and a crystallization mother liquor are recycled. The process has the characteristics of convenient operation, easy large-scale production, low energy consumption, low product cost and no pollution to environment and the prepared anhydrous magnesium chloride can be used as a raw material for producing magnesium metal by an electrolysis method.

This invention provides a method for crystallizing proteins from protein solution with ionic liquid-water mixed solution. The ionic liquid-water mixed solution is composed of ionic liquid 1-85wt.%, and buffer solution 1-25 wt.%, and the pH value is 4.0-11.0. The method has a wide process conditions, and can obtain protein single crystals with different morphologies under different conditions. The obtained protein single crystals have such advantages as high diffractive intensity, high repeatability and high operability.

The invention relates to a preparation method of lithium type low-silicon faujasite. The method comprises the following steps of (1) uniformly mixing forming particles of medium-silicon faujasite with the SiO2 / Al2O3 mol ratio being 2.2 to 3.0 and caustic solution comprising sodium hydroxide and potassium hydroxide for preparing a reaction mixture; (2) performing hydrothermal reaction on the reaction mixture in the step (1) to obtain the formed low-silicon faujasite solid product; (3) performing lithium exchange on the solid products obtained in the step (2) to prepare formed lithium type low-silicon faujasite. The invention also relates to the lithium type low-silicon faujasite prepared by the method and a purpose of the lithium type low-silicon faujasite as an adsorbent.

The invention relates to a fructose separation method using ion exchange fiber as chromatographic packing, the ion exchange fiber is used as the chromatographic separation packing for separation and preparation of high purity fructose from high fructose corn syrup and other mixed sugar solution, the mixed sugar solution is a mixed solution containing high fructose corn syrup F42 or other concentration of fructose, the ion exchange fiber is strong acidic ion exchange fiber, the diameter at dry state is 8-170 mum, cation exchange capacity is 2.0-4.3mmol / g, and before being used for separation of fructose, the replacement of calcium ions is performed in advance for the conversion from hydrogen type to calcium type. Compared with the ion exchange granular resin chromatographic column, the strong acid ion exchange fiber shows more excellent separation precision and higher production efficiency.

The invention discloses a preparation method of highly pure alumina, belongs to the technical field of alumina preparation, and concretely relates to a method for preparing highly pure alumina powder with the purity of 99.999% or above from alumina with the purity of 99.95-99.995%. The method comprises the following steps: mixing a raw material alumina with a certain concentration of superior pure ammonia water according to a certain liquid / solid ratio, reacting above materials at 50-250DEG C for 0.5-20h, filtering the obtained material, washing the filtered material, and drying the washed material to obtain the highly pure alumina with the purity of 99.999% or above. The method allows the highly pure alumina to be prepared, and has the advantages of high product purity, simple process and low cost. The highly pure alumina prepared in the invention is suitable for the fields of laser crystals, transparent ceramics and LED sapphire long crystals.

The invention relates to a method for preparing anhydrous magnesium chloride from bischofite, which uses the bischofite as a raw material for preparing the anhydrous magnesium chloride. The method comprises the following technical processes: (1) firstly, drying the bischofite for dewatering most crystallization water; (2) dissolving the dried magnesium chloride in glycol for preparing a glycol solution of the magnesium chloride and using a vacuum distillation method for dewatering water in the glycol solution of the magnesium chloride; (3) reacting the dewatered glycol solution of the magnesium chloride with ammonia for crystallizing so as to generate magnesium chloride hexammoniate crystals; (4) washing, filtering and drying for obtaining the magnesium chloride hexammoniate crystals; and(5) heating, decomposing and deaminating the dried magnesium chloride hexammoniate crystals for preparing the anhydrous magnesium chloride. In each process, ammonia gas, detergent and a crystallization mother liquor are recycled. The process has the characteristics of convenient operation, easy large-scale production, low energy consumption, low product cost and no pollution to environment and the prepared anhydrous magnesium chloride can be used as a raw material for producing magnesium metal by an electrolysis method.

The electroplating solution of the invention comprises rare earth chloride, FeCl2, complexe agent, additive I, II, CaCl2. The process comprises, an inert anode or transition metal anode or two anodes; introducing pure argon or nitrogen to dispel oxygen, the whole electroplating process conducting in the protective environment of pure argon or nitrogen, the working current density is 20mA / cm2-200mA / cm2, the time is 15min-48hours, the temperature is 0-70degree C, taking out of the electroplated members, washing ,drying and sealing; placing the electroplated film in the protective environment of pure argon or nitrogen, heating at 700-800 degree C for 15min-20hours, sealing and storing. The electroplating solution is stable and has a wide range of working conditions. The rare earth alloy has more than 11% of rare earth.

The invention aims to provide a method for preparing lavender absolute oil through biological fermentation and application thereof. The method comprises the steps that a certain proportion of water isadded into a dried lavender spike, microwave pretreatment is carried out, then acid is added for hydrolysis, a compound biological agent is added for incubation and fermentation, then backflow extraction is carried out on ethyl alcohol, a filter screen is used for filtration, a lavender fermentation extracting solution is obtained, after decompression concentration, precipitation and quiescenceare carried out for a night on absolute ethyl alcohol, the precipitate is removed through centrifugation, and the lavender absolute oil is prepared through the biological fermentation. The invention further provides the application of the lavender absolute oil prepared through the biological fermentation in perfuming a cigarette, the lavender absolute oil is in good coordination with the smoke, the cigarette fragrance is clear and rich, the fragrance is natural and abundant, not only does the cigarette have the special fragrance of fresh lavender and wood fragrance, but also the cigarette hascompound bake, chocolate, fruit, sweet aroma and the like; compared with a reference material, the irritation is reduced, the impurities are reduced, no bitter exists; and the defects of too single and strong fragrance, strong irritation and bitter remaining taste of lavender absolute oil without the biological fermentation are overcome.

Provided is a plasma processing apparatus that performs a processing on a processing target object using plasma. The plasma processing apparatus includes a processing container and a plasma generating mechanism including a high frequency generator disposed outside of the processing container to generate high frequency waves. The plasma generating mechanism generates plasma in the processing container using the high frequency waves and includes: a high frequency oscillator that oscillates the high frequency waves; a power supply unit that supplies a power to the high frequency oscillator; a waveguide path that propagates the high frequency waves oscillated by the high frequency oscillator to the processing container side which becomes a load side; and a voltage standing wave ratio variable mechanism that varies a voltage standing wave ratio of voltage standing waves formed in the waveguide path by the high frequency waves, according to the power supplied from the power supply unit.

This invention involves a preparation method of cyclo-fat benzyl ether. It take cyclo-fat alcohol as raw material, non-water-soluble organic as solvent, at 50% solids alkaline aqueous solution environment, by adding benzyl reagent, stirring and refluxing to obtain cyclo-fat benzyl ether. This invention obtain the product by using phase transfer catalyst to synthesize benzyl, adding small amount ofphase-transfer catalyst in the two-phase reaction system, without joining alumina, and taking toluene and dichloromethane etc. common solvent as solvents, mixing in 50% alkaline environment. Throughthe optimization of processes, the reaction time is shortened considerably; Chromatography absorption rate can achieve 85% to 100%, suit for industrial production.

The invention relates to an electromagnetic shielding epoxy composite material with an isolation structure and a preparation method thereof, belonging to the technical field of polymer composite materials. The electromagnetic shielding epoxy composite material has an electromagnetic shielding effect of 20-60dB in the X-band, a mechanical strength of 4-14MPa, and a breaking elongation of 400-800%. After crushing and re-pressing, the mechanical strength can still maintain more than 85%. The invention adopts glass-like dynamic cross-linking epoxy resin as a matrix to form a multi-walled carbon nanotube conduction path with an isolation structure, and has high electromagnetic shielding efficiency and excellent mechanical properties under low filler content. In the invention, the amount of conductive filler is less, other raw materials are commonly used and easy to obtain, the preparation process is simple, the range of hot pressing molding process conditions is wide, and the control precision is not strict. The composite material of the invention can be hot-pressed again after crushing again, the isolation network structure is still intact, and the electromagnetic shielding efficiency and mechanical properties can still maintain more than 85% of the original performance, so that reprocessing can be realized.

The invention relates to a method for preparing pyrolytic carbon by using an acetaldehyde precursor, which is characterized in that in a chemical vapor infiltration process, an acetaldehyde organic solution is used as a precursor, and nitrogen is used as carrier gas and diluent gas. The acetaldehyde organic solution is poured into a closed metal container, and the acetaldehyde organic solution is changed into steam to participate in the reaction through a bubbling method. According to the method, the pyrolytic carbon with a good structure is prepared by taking acetaldehyde as a precursor for the first time by utilizing a chemical vapor deposition process technology. The preparation method is simple and reasonable, wide in process conditions and convenient to operate. Meanwhile, the selection of a pyrolytic carbon raw material preparation system is broadened, and a new thought is provided for structural optimization of pyrolytic carbon.

The present invention relates to a preparation method of an organic compound, in particular to a method used for synthesizing 2, 3, 4, 5-tetrahydro-1H-1, 4-benzodiazepine. The raw materials of o-halogen benzyl halogen and ethylene have mixing reaction in an organic solvent; the intermediate product of N-(2-benzyl) ethylene diamine can be prepared after separation and purification; then the intermediate product is dissolved in the system of ring-closing agents; under the condition with a catalyst, the final product can be prepared through ring-closing reaction. Compared with the synthetic method in the prior art, the preparation method of the 2, 3, 4, 5-tetrahydro-1H-1, 4-benzodiazepine has the significant advantages of simple synthetic process, wide range of technical conditions, safe andeasy operation, environmentally friendly operation, cheap and easily available raw materials, great decrease of the production cost, high yield of the final product, high purity of the product, and broader application prospects.

The invention relates to a xylose and arabinose separating method using ion exchange fiber as chromatographic packing, the ion exchange fiber is used as the chromatographic separation packing for separation and preparation of high purity xylose and arabinose from xylose crystallization mother liquor, the ion exchange fiber is strong acidic ion exchange fiber, the diameter at dry state is 8-170 mum, cation exchange capacity is 2.0-4.3mmol / g, and before being used for separation of the xylose crystallization mother liquor, the replacement of calcium ions is performed in advance for the conversion from hydrogen type to calcium type. Compared with the ion exchange granular resin chromatographic column, the strong acid ion exchange fiber shows more excellent separation precision and higher production efficiency.

The invention provides a calcium-doped beta-Bi2O3 photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving P-123 into a nitric acid solution; adding bismuth nitrate pentahydrate; adding calcium chloride after the bismuth nitrate pentahydrate is completely dissolved, obtaining a precursor sol of the calcium-doped beta-Bi2O3 photocatalyst after the calcium chloride is completely dissolved, and aging the precursor sol to obtain a precursor solution of the calcium-doped beta-Bi2O3 photocatalyst; crystallizing the precursor solution in a sealed manner to obtain a crystallized product; cooling, and performing suction filtration to obtain a calcium bismuth compound; drying to obtain a precursor of the calcium-doped beta-Bi2O3 photocatalyst; calcining the precursor, and cooling and grinding to obtain the calcium-doped beta-Bi2O3 photocatalyst. The calcium-doped beta-Bi2O3 photocatalyst has higher visible light absorption capability and higher sunlight energy utilization efficiency; the preparation method is simple in preparation process, easy to control operating conditions and low in cost.

The invention discloses a preparation method of highly pure alumina, belongs to the technical field of alumina preparation, and concretely relates to a method for preparing highly pure alumina powder with the purity of 99.999% or above from alumina with the purity of 99.95-99.995%. The method comprises the following steps: mixing a raw material alumina with a certain concentration of superior pure ammonia water according to a certain liquid / solid ratio, reacting above materials at 50-250DEG C for 0.5-20h, filtering the obtained material, washing the filtered material, and drying the washed material to obtain the highly pure alumina with the purity of 99.999% or above. The method allows the highly pure alumina to be prepared, and has the advantages of high product purity, simple process and low cost. The highly pure alumina prepared in the invention is suitable for the fields of laser crystals, transparent ceramics and LED sapphire long crystals.

This invention provides a method for crystallizing proteins from protein solution with ionic liquid-water mixed solution. The ionic liquid-water mixed solution is composed of ionic liquid 1-85wt.%, and buffer solution 1-25 wt.%, and the pH value is 4.0-11.0. The method has a wide process conditions, and can obtain protein single crystals with different morphologies under different conditions. Theobtained protein single crystals have such advantages as high diffractive intensity, high repeatability and high operability.

The invention discloses a softening process for industrial raw water, and the process comprises the following steps of: A. industrial raw water input; B. softening reagent injection; C. precipitation and collection of a natural crystal grain which mainly comprises CaCO3; D. cyclic reinjection of the natural crystal grain which mainly comprises CaCO3; E. crystal grain growth to become a circulating fluidized-suspended bed; F. softened water output; G. sand discharge. Compared with traditional clarifier process, the invention has the advantages of both a fluidized bed and a suspended bed, so the filtration rate is high and the volume is small; and the resultant is sand which is easy for dehydration. According to the process of the invention, the crystal nucleus is generated naturally and grows circularly by itself; no artificial processing of the crystal nucleus is necessary; and the cost for the processing and the addition of an artificial crystal nucleus is saved; the particle size and the flow velocity of the suspended crystal grain in the process of the invention are self-matched without strict requirements to the particle size of the initial crystal nucleus, and are self-adjusted, so the process condition is quite wide; no accurate matching with the filtration rate of raw water is necessary; and the process operation becomes more simple and reliable.

The invention relates to a new hydrothermal synthesis method of zinc borate whisker. The method comprises the following steps: firstly, using borax to prepare 2.0-5.8wt% of solution; secondly, adding the solution in zinc salt solution, stirring evenly to obtain slurry; thirdly, placing the slurry in a reaction kettle, adjusting the inner filing degree of the reaction kettle, heating the reaction kettle to 110-160 DEG C, performing thermostatic reaction for 1-50 hours, cooling to the room temperature to obtain white precipitate; and finally, filtering the precipitate, washing, and drying to obtain zinc borate whisker powder. In the synthesis process, surfactant used as crystal form modifier is not added; and the anisotropy of crystals is utilized and the reaction conditions are controlled to prepare zinc borate whisker, the technology is simple, and the cost is low.

The invention relates to a preparation method of lithium type low-silicon faujasite. The method comprises the following steps of (1) uniformly mixing forming particles of medium-silicon faujasite with the SiO2 / Al2O3 mol ratio being 2.2 to 3.0 and caustic solution comprising sodium hydroxide and potassium hydroxide for preparing a reaction mixture; (2) performing hydrothermal reaction on the reaction mixture in the step (1) to obtain the formed low-silicon faujasite solid product; (3) performing lithium exchange on the solid products obtained in the step (2) to prepare formed lithium type low-silicon faujasite. The invention also relates to the lithium type low-silicon faujasite prepared by the method and a purpose of the lithium type low-silicon faujasite as an adsorbent.

The present invention adopts benzene and C9 and higher aromatic hydrocarbons as raw material for reaction, in the fixed bed reactor and under the condition of hydrogenation uses the composition formed from zeolite in which the silicon-aluminium ratio is 3-500 and alumina as catalyst, on the zeolite metal molybdenum or / and its oxide and non-forced-added at least one metal selected from Fe, Co, Ni, Cr, W, Bi, La, Zr and Ag or / and oxide are loaded, under the conditions of that reaction temp. is 300-600 deg.C, pressure is 1.0-6.0 MPa, hydrogen and hydrocarbon mole ratio of 1-15 and weight space velocity WHSV is 0.5-5.0 hr.(-1) makes the above-mentioned materials produce reaction to produce methylbenzene and C8 aromatics.