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문상흡,서성섭 ( Sang Heup Moon,Sung Sup Suh ) 한국화학공학회 1981 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.19 No.1
Controlled-release fertilizers are developed to prevent wasteful use of fertilizers as well as to supply proper amounts of fertilizer ingredients to crops. In this paper, necessity and techniques of controlled-release fertilizers are discussed, a few commercial products are introduced, and their economic aspects are considered. Several areas of future investigations are also indicated.
무촉매 및 등온 반응조건에서 여러 가지 석탄 챠의 수증기 가스화 반응특성
최영교,문상흡,이호인,이화영,이현구 ( Young Kyo Choi,Sang Heup Moon,Ho In Lee,Wha Young Lee,Hyun Ku Rhee ) 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.3
Steam gasification of three different coal chars and activated carbon has been carried out in a fixed-bed reactor under the conditions of 650-1000℃ and 0.1-0.7 atm of steam. Three sample coals are Korean Jangsung anthracite, Chinese Tatong bituminous and Indonesian lignite. The gasification rate, estimated from G.C. analysis of the product gases, increases initially in parallel with the surface area of the reacting char, reaching the maximum when the carbon conversion is about 5-15%. Mechanism of the char gasification is well represented by the unreacted shrinking-core model. Chars of the lower-rank coals exhibit relatively fast gasification rates at low temperatures, but the bituminous coal char shows a significant increase in the gasification rate at higher temperatures. The CO₂/CO and H₂/CO molar ratios among the products and the activation energy of CO formation decrease with increasing rank of the sample coals.
고영찬,문상흡 ( Young Chan Ko,Sang Heup Moon ) 한국화학공학회 1975 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.13 No.4
The primary intention of this paper is to present a broad introduction of controlled-release technology. Discussions are centered on techniques of formulation and release mechanisms of active ingredients. Aspects of practical application of this technology, together with some actual examples, are also provided.
알칼리 금속촉매하에서 여러 가지 석탄 챠의 수증기 가스화 반응특성
최영교,문상흡,이호인,이화영,이현구 ( Young Kyo Choi,Sang Heup Moon,Ho In Lee,Wha Young Lee,Hyun Ku Rhee ) 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.4
The catalytic effect of K₂CO₃ and Na₂CO₃ on stream gasification of various coal chars has been investigated in a fixed-bed type reactor under the atmospheric pressure. Activated carbon and 3 kinds of coal chars obtained from Korean Jangsung anthracite, Chinese Tatong bituminous and Indonesian lignite have been used as samples. Addition of alkaline catalysts such as Na₂CO₃, and K₂CO₃ to the samples has lowered the reaction temperature by about 170℃ for obtaining the same conversion as in the non-catalytic case. The gasification process is well-described by the unreacted shrinking-core model, and the rates show compensation effect as the samples are loaded with catalysts. In case of the Na₂CO₃-loaded activated carbon, the isokinetic temperature is about 1500 K. An increase in the catalyst loading enhances the reaction rate and the CO₂/CO molar ratio among products, but the rate and the ratio become almost constant above the catalyst loading of 15 wt%. In case of the catalyst-loaded coal chars, activation energy of CO formation is lower and selectivity for CO production is higher than those in the non-catalytic case.
박남수,문상흡,이호인,이화영,이현구 ( Nam Soo Park,Sang Heup Moon,Ho In Lee,Wha Young Lee,Hyun Ku Rhee ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.2
Indonesian lignite and Chinese bituminous coal were pyrolyzed under different heating rates between 1℃/min and 150℃/min, and the chars obtained thereby were steam-gasified in a fixed-bed micro-reactor at temperatures between 800 and 1000℃ and under the steam partial pressures between 0.26 and 0.57 atmospheres. The chars obtained by fast pyrolysis at the heating rate of 150℃ /min exhibited higher gasification rates than the chars pyrolyzed at the heating rates lower than 25℃/min, but the apparent activation energies of gasification of the two samples were almost same: 114 KJ/㏖ and 113 KJ/㏖. The char surface areas estimated by gas adsorption exhibited opposite results depending on the adsorption gas, N₂ or CO₂. The surface areas estimated from CO₂ adsorption were higher for the fast-pyrolyzed chars than for the slowly-pyrolyzed ones. Formation of many micropores in the fast-pyrolyzed chars, evident from transient pressure change in the adsorption experiment, was responsible for the relatively high gasification rates.