Abstract:
PURPOSE: A method for preparing light olefins is provided to obtain propylene and butane selectively at yield more than 60 weight%, especially to obtain butane at 30 weight% yield. CONSTITUTION: A method for preparing light olefins using a mordenite catalyst comprises a step of preparing C2~C4 olefins by reacting an oxygen-containing compound in the presence of the mordenite catalyst with an Si/Al molar ratio of 80~150. The sum of butene and propylene is 60 weight% or more and the yield of butane is 20 weight% or more. The BET specific surface area of the mordenite catalyst is 400~500 m^2/g.
Abstract:
본 발명은 선택산화탈황용 촉매와 이의 제조방법에 관한 것으로, 더욱 상세하게는 특정의 기공 크기, 벽두께, 입자 크기, 및 비표면적을 갖는 중기공성 실리카 분자체에, 전이금속을 일정 함량 비율로 담지시킨 선택산화탈황용 촉매와 추가적으로 상기 실리카 분자체의 표면이 실릴화된 선택산화탈황용 촉매를 제공함으로써, 높은 황화합물 함량을 갖는 석유계 탄화수소에 대한 선택적 산화탈황성능을 최대로 하고, 선택산화탈황 반응의 부산물인 술폰화합물이 촉매의 담체로 침적되는 것을 방지하여 촉매의 수명을 최대로 연장시킨 선택산화탈황용 촉매 및 이의 제조방법에 관한 것이다.
Abstract:
The iodine-free salt suitable for thyroid patients, and a method for preparing the iodine-free salt are provided to make the iodine-free salt having a flower shape, to reduce the solid part insoluble in water and to improve the taste and preference. The iodine-free salt is prepared by adding 1-10 parts by weight of the saturated refined salt aqueous solution containing 2-5 ppb of iodine to 1 part by weight of the bay salt containing 50-300 ppm of iodine, and filtering and washing it to make the bay salt containing 1-10 ppm of iodine; and mixing 1-5 parts by weight of the washed bay salt and 5-9 parts by weight of the refined salt containing 2-5 ppb of iodine in water and crystallizing it by evaporation at 70-100 deg.C.
Abstract:
A catalyst for selective oxidative desulfurization and a manufacturing method thereof are provided to extend a lifetime of the catalyst and to maximize selective oxidation desulphurization capacity about the petroleum hydrocarbon having high sulfide content. A catalyst for selective oxidative desulfurization includes 0.5 ~ 10 weight part of a transition metal dipped in a mesopore silica molecule having 2 ~ 10 nm of pore size, 14 ~ 20 Å of wall thickness, 0.1 ~ 1.0 mum of particle size, and 500 ~ 1400 m^2/g of specific surfacearea. The surface of the catalyst for selective oxidative desulfurization is sylilated by a silylating agent of 0.05 ~ 1.0 molar ratio based on a molar ratio of a silica molecule. The silylating agent is a silane compound selected among C1-20 alkyl silane, C1-20 alkylsilazane, and C1-20 alkoxy silane. The transition metal is a single transition metal or the transition metals more than 2 kinds selected from 4B, 5B, 6B, 7B and 8B family.
Abstract:
A method for manufacturing a silicoaluminophosphate molecular sieve with high performance and stability to manufacture of light olefins and a method for manufacturing the light olefins using the same are provided to increase MTO reactivity efficiency, catalyst life, and a catalyst synthesis yield by optimizing size of a crystal. A method for manufacturing a silicoaluminophosphate catalyst to manufacture of light olefins comprises the following steps of: manufacturing aluminum phosphate gel by mixing water, an alumina precursor, a phosphoric acid; adding an organic template is added in the aluminum phosphate gel; manufacturing synthesized gel by agitating the aluminum phosphate gel and the organic template; dissolving silica after mixing and agitating a DEA organic template and a silica precursor; mixing a silica-dissolved mixture with the synthetic gel; manufacturing SAPO-34 containing the organic template; and the manufacturing the SAPO-34 removed the organic template.
Abstract:
A method for producing tetralone is provided to improve the conversion ratio and selectivity of tetralone by using a heterogeneous catalyst containing transition metals and to maintain the durability and activity of catalyst although the catalyst is reused by a cleaning process. In a method for producing tetralone by performing the oxidation of the liquid portion of tetralin in the presence of a catalyst system and oxidant, the catalytic system is a heterogeneous catalyst containing molecular sieve 99.5~95 mole % and transition metal 0.5~5.0 mole % and the reaction is performed at 20~150 °C for 2~12 hours with a stirring speed of 50~1000 rpm.