Abstract:
A method for decomposing carbon dioxide using the barium ferrite is provided to decompose almost 100% of carbon dioxide at a quick reaction rate, and to be capable of operating processes continuously by cyclone type of recovery method. A method for decomposing carbon dioxide using the barium ferrite includes the steps of: performing a hydrolysis reaction of an aqueous alkali solution(2) and a mixture(1) of aqueous nitrate solutions containing iron and barium at ambient temperature under a reaction pressure of 30-50 MPa; supplying preheated water(6) to the hydrolysis reaction step to raise the reaction temperature to 100-400 °C, and staying the preheated water for 3-10 seconds to form critical nuclei; supplying preheated water(8) to heat the hydrolysate to the supercritical temperature for water, performing a final dehydration reaction in a reactor(9) maintaining a supercritical state to collect barium ferrite continuously; and hydrogenating the barium ferrite, and then reacting the hydrogenated barium ferrite with carbon dioxide.
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:
The present invention relates to a compound including oxalate, a carbon dioxide absorbent including the same, a method for producing the same, and a method for removing carbon dioxide. The high reproducing energy and low absorbing function of existing carbon dioxide absorbents are overcome so that reproducing energy is remarkably lowered. The carbon dioxide absorbed per unit of absorbent can be increased so that the size of a carbon dioxide absorbing tower can be reduced. Used reproducing energy is lowered so that device producing costs and operating costs can be remarkably reduced and economical feasibility can be ensured.
Abstract:
본 발명은 탈황제로서 그래핀 옥사이드에 화학적으로 결합된 산화아연의 제조 방법에 관한 것으로, 특히 마이크로웨이브를 이용하여 탈황효율을 높인 제조 방법에 관한 것이다. 본 발명은, 흑연을 산과 산화제로 산화 후 박리시킨 그래핀 옥사이드를 준비하는 단계; 상기 그래핀 옥사이드에 에틸렌 글리콜(ethylene glycol)을 혼합 후 초음파 진동을 이용한 1차 분산 단계; 상기 1차 분산 단계를 거친 혼합액을 수산화 나트륨(sodium hydroxide, NaOH) 수용액과 혼합 후, 초음파 진동을 이용한 2차 분산 단계; 상기 2차 분산 단계를 거친 혼합액에 아연 아세테이트(Zinc Acetate, ZnAc) 수용액을 첨가하여 초음파 진동기로 혼합하는 단계; 상기 초음파 진동기로 혼합하는 단계를 거친 혼합액에 환원제를 첨가한 후 마이크로웨이브로 열처리하여 환원하는 단계; 상기 열처리하여 환원하는 단계를 거친 혼합액을 냉각하고 증류수로 세척한 후 냉동 진공건조기에서 건조시키는 단계를 포함하는, 산화아연/환원된 그래핀 옥사이드 화합물의 제조 방법을 제공하여, 고온에 따른 산화아연 입자들의 뭉침현상을 방지하고, 산화아연 입자들의 표면적을 넓혀 황화수소 흡착율을 극대화시킨다.