Abstract:
PURPOSE: A preparation method of barium titanate powder by hydrothermal synthesis is provided, which prevents corrosion of powder preparation equipment and lowers production cost by using Ba and Ti hydroxides as raw materials instead of conventional raw materials containing chlorides. CONSTITUTION: The continuous preparation method of fine and homogeneous BaTiO3 powder through hydrothermal process comprises the steps of: (i) mixing barium hydroxide, Ba(OH)2-8H2O, with titanium hydroxide, TiO(OH)2 in a concentration ratio of 0.5-2 : 1 under pressure of 10-40MPa, which is expressed by the formula TiO(OH)2 + Ba(OH)2-8H2O -->BaTiO3 +10H2O; (ii) supplying hot water to the mixture for 100-400deg.C of mixture; (iii) reacting 3-10sec. to form critical nuclei; (iv) supplying hot water to the intermediates forming critical nuclei, and dehydrating under subcritical and supercritical state to get BaTiO3; (v) separating synthesized materials and recycling.
Abstract:
PURPOSE: Provided are a method and a device which substantially increase a reaction rate of hydrolysis using a supercritical water and improve the yield of hydrolysis. CONSTITUTION: The method comprises the steps of (i) heating and pressurizing a raw water containing a small amount of sulfuric acid or sulfate in a heating part(4), (ii) providing the raw water to reactor(8) together with cellulose slurry provided by the slurry pump(10) to effect a hydrolysis, (ii) terminating a reaction by firstly cooling the reactants discharged from the reactor(8) with cooling water provided from cooling water tank(12), (iii) completely terminating a reaction by secondarily cooling the reactants by heat exchanger(13), (iv) passing the reaction product to filter unit(14) to filter an unreacted cellulose, while the filtrate being obtained from a product collecting tank.
Abstract:
PURPOSE: A zeolite sorption agent wherein solid amine is impregnated is disclosed, along with a manufacturing method thereof, to be excellent in a sorption capacity, an ability to remove carbon dioxide, event at 50°C, a temperature combustible waste gas is ejected to the atmosphere. CONSTITUTION: A zeolite sorption agent wherein solid amine is impregnated comprises the steps of: preparing a solid amine solution, adding molded zeolite in the solid amine solution, impregnating the zeolite added solution at 30-90°C, for 2-8 hours, in a vacuum, and drying the solution in a vacuum oven at 90-110°C, for 10-30 hours.
Abstract:
PURPOSE: A perovskite type ion conductivity tube shape oxygen separating film and a manufacturing method are provided to use serviceably to oxygen separation from the air with carbon dioxide as the oxygen permeation degree and the thermal stability are improved a lot in high pressure and temperature compare to the separation film which is not coated. CONSTITUTION: A perovskite type ion conductivity tube shape oxygen separating film has the composition of the Ba1-xSrxCo1-yFeyO3- and is coated with the La1-xSrxTi1-yFeyO3-. In a chemical formula, it is 0
Abstract translation:目的:提供钙钛矿型离子传导性管状氧分离膜和制造方法,可有效地利用二氧化碳作为氧气渗透度从空气中分离氧气,并且在高压和高温下热稳定性提高很多 未涂布的分离膜。 构成:钙钛矿型离子传导性管状氧分离膜具有Ba1-xSrxCo1-yFeyO3的组成,并且涂覆有La1-xSrxTi1-yFeyO3-。 在化学式中,它是0 <= x <= 1,0 <= y <= 1。 钙钛矿型离子导电管形氧分离膜的制造方法包括以下步骤: 以BSCF粉末的相应8-11与粘合剂1的比例混合干燥步骤; 以8〜11倍的蒸馏水稀释聚乙二醇后,以液态混合2-3份稀释物质与1种增塑剂的重量比的步骤; 通过压缩成型混合物产生管形分离膜的步骤; 通过干燥和塑化所生产的管形分离膜产生精细分离膜的步骤; 在具有20-40%的LSTF粉末的胶体悬浮液中浸泡并涂覆管状分离膜的步骤; 以及通过干燥和塑化涂覆的管状分离膜来产生LSTF涂布的BSCF精细分离膜的步骤。
Abstract:
본 발명은 페롭스카이트형 혼합전도성 산소분리막 및 그 제조방법에 관한 것으로, 더욱 상세하게는 종래의 BSCF 조성의 분리막에 LSTF 조성의 분리막을 코팅함으로써 산소 투과 특성 및 이산화탄소에 대한 내성이 향상된 LSTF-6437이 코팅된 BSCF-5582 산소분리막 및 그 제조방법에 관한 것이다. 본 발명에 따른 LSTF-6437이 코팅된 BSCF-5582 산소분리막은 BSCF-5582 분리막의 표면을 LSTF-6437 코팅액으로 코팅함으로써 산소투과 시 이산화탄소(CO 2 )에 의한 불순물 생성 반응을 억제하여 산소 투과량의 저하를 방지할 수 있으며 코팅 표면의 비표면적 증가에 따라 산소투과량을 증가시킬 수 있는 장점이 있다.
Abstract:
본 발명은 이산화탄소 흡수제에 관한 것으로, 더욱 상세하게는 알칼리 탄산염 물질에 입체장애(hindered) 시클릭 아민을 첨가함으로써 이산화탄소 흡수속도가 향상되고 재생에너지가 절감되며 염 생성 및 상분리가 발생되지 않도록 하는 입체장애 시클릭 아민이 첨가된 알칼리탄산염계 이산화탄소 흡수제 및 이를 이용한 이산화탄소 제거방법에 관한 것이다. 본 발명에 따른 알칼리염계 이산화탄소 흡수제에 의하면 낮은 재생에너지와 높은 이산화탄소 흡수속도로 인해 이산화탄소 포집비용을 절감할 수 있으며 염 생성 및 층 분리 현상이 발생하지 않아 흡수제를 보충할 필요가 없어서 공정효율을 정상상태로 유지할 수 있다는 장점이 있다. 이산화탄소 흡수제, 입체장애아민, 알칼리탄산염, 입체장애 시클릭 아민
Abstract:
The present invention relates to an ionic liquid-polymer gel membrane with improved gas permeability, and a preparation method thereof, and more specifically, to a membrane prepared to allow an ionic liquid to be dispersed in a polymer gel, thereby improving gas permeability. Particularly, the present invention relates to an ionic liquid-polymer gel membrane wherein membrane selectivity and permeability exceed an upper bound by increasing the amount of dispersed ionic liquid, and a preparation method thereof. The preparation method of the membrane for separating a specific gas from a mixture gas according to the present invention comprises the following steps of: mixing a polymer, an ionic liquid and PC as a solvent to prepare a mixture solution; and drying the mixture solution to remove the solvent from the mixture solution. In addition, the polymer is polyvinylidene fluoride-hexafluoropropyl copolymer (PVdF-HFP), and the ionic liquid is 1-ethyl-3-methylimidazolium tetrafluoroborate ([emim][BF4]).
Abstract:
PURPOSE: A carbon dioxide absorber using meso-porous materials and a carbon dioxide eliminating method using the same are provided to increase an area, to which carbon dioxide is absorbed, based on branches of polyethyleneimine. CONSTITUTION: A carbon dioxide absorber includes meso-porous materials and polyethyleneimine. The average molecular weight of the polyethyleneimine is between 450 and 650. The polyethyleneimine is immersed in the meso-porous materials. The meso-porous materials are MCM-41 or MCM-48. The absorber absorbs carbon dioxide at a temperature between 40 and 80 degrees Celsius. The immersing rate of the polyethyleneimine is M2/(M1+M2)x100 and is in a range between 25 and 35 wt%, between 45 and 55 wt%, or between 65 and 75 wt%. The M1 is the content of the meso-porous materials. The M2 is the content of polyethyleneimine.
Abstract:
PURPOSE: The carbon dioxide absorbing agent of imidasolium-based ionic liquid, a method for fabricating the same, and a method for absorbing carbon dioxide using the same are provided to reduce energy required for regenerating the absorbing agent by substituting imidazolium-based ionic liquid absorbing agent with alkaline salt to obtain the carbon dioxide absorbing agent. CONSTITUTION: Alkaline salt is added in ionic liquid. The ionic liquid is 1-butyl-3-methylimidazolium iodide using imidazolium as cation. The alkaline salt is selected from KHCO_3 or KOH. The alkaline salt added ionic liquid is stirred to obtain a carbon dioxide absorbing agent. A carbon dioxide absorbing process is implemented in a carbon dioxide absorbing performance measuring unit(10) at temperature between 35 and 45 degrees Celsius and the pressure more than or equal to 10bar.
Abstract:
Provided are a method of manufacturing a Perovskite-type ion conductive oxygen membrane having a hexahedral structure or rhombohedral structure instead of a simple cubic structure to obtain a high oxygen permeability, and a process of separating oxygen using the oxygen membrane. A method of manufacturing a Perovskite-type ion conductive oxygen membrane comprises: a first step of adding citric acid into a metal nitrate solution and dissolving distilled water into the metal nitrate solution to prepare a mixed solution; a second step of evaporating water of the mixed solution to dry the mixed solution; a third step of milling and calcining the dried mixture to prepare a synthesized powder; and a fourth step of compression molding the synthesized powder to manufacture a membrane. The membrane has a hexahedral structure or rhombohedral structure.