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목질계 바이오매스에 대한 암모니아 재순환 침출공정 최적화
오경근,홍석인 ( Kyeong Keun Oh,Suk In Hong,Yoon Y . Lee ) 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.5
ARP(Ammonia Recycled Percolation) process was developed as the effective treatment process for removing the lignin from cellulose and hemicellulose of lignocellulosic biomass. In this article, as the basic study of ARP, the properties and the optimum conditions of process were estiblished, and then the overall efficiency of ARP was investigated. The important independent variables for ARP process were selected as ammonia concentration, percolation temperature, and flow rate of solvent. The percolation condition for maximizing the content of cellulose, the enzymatic digestibility, the remaining percent weight, and the lignin removal was optimized using the RSM(Response Surface Methodology). The determined optimum condition is ammonia concentration; 17.5%, percolation temperature; 185℃, and flow rate of solvent; 1.5㎖/min. The satisfying results were obtained under this optimized condition, that is, the results are as follows : cellulose content; 72.33%, lignin content ; 11.16%, and enzymatic digestibility ;92.13 %.
반응표면분석법을 이용한 알파셀룰로오스 가수분해 반응조건 최적화
오경근,김승욱,정용섭,홍석인 ( Kyeong Keun Oh,Seung Wook Kim,Yong Seob Jeong,Suk In Hong ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.4
To obtain the maximize the concentration of reducing sugar, optimum operating conditions for the hydrolysis of cellulose was investigated by using the response surface methodology. The independent variables were enzyme activity, substrate concentration and reaction temperature and reducing sugar concentration and production yield(reducing sugar concentration pet amount of enzyme) were dependent variables. Following the 3³-fractional factorial experimental design, 17 experiments were carried out at various conditions, with 5 starpoints and 4 replicates at the center point. The optimum condition for the hydrolysis of cellulose was as follows, enzyme activity; 274 FPU, substrate concentration; 8.9%, and reaction temperature; 51℃. The maximum production of reducing sugar, 47.89 g/L, was obtained in this optimum condition.
폴리프로필렌-카본 블랙 혼합 수지로 제조한 부직포형 일렉트리트(electret) 공기 여과 소재의 정전기 특성이 여과 효율에 미치는 영향
오경근 ( Kyeong Keun Oh ),윤호규 ( Ho Gyu Yoon ),윤재만 ( Jae Man Yoon ),최응수 ( Ung Su Choi ) 한국공업화학회 2003 공업화학 Vol.14 No.1
폴리프로필렌(polypropylene, PP) 및 폴리프로필렌-카본 블랙(polypropylene-carbon black, PP-CB) 혼합 수지로 공압출 방사 시스템(spray-spinning extrusion system)과 코로나 대전 장치(corona charging unit)를 이용하여 일리트리트 섬유상 석과 소재(electret fibrous filter media)를 제조하여 정전기 특성 및 여과 특성에 대하여 고찰하였다. 제조한 부직포형 공기 여과 소재에 잔존하는 표면 전하 밀도(effective surface charge density, ESCD)를 진동 전극 기술을 이용하여 비접촉 방식으로 측정하였는데, 코로나 대전 전류가 증가할수록 또한 카본 블랙 함량이 증가할수록 표면 전하 밀도는 증가하였으며 코로나 대전 전류 200㎂, 카본 블랙 함량 4 wt%의 조건에서 재조한 여과 소재의 표면 전하 밀도가 최대값을 나타내었다. 필터 성능 시험기를 사용하여 여과 효율을 측정한 결과, 대전된 여과 소재가 대전되지 않은 경우보다 또한 카본 블랙 라량이 증가할수록 더 높은 여과 효율을 나타냈으며, 여과 효율 역시 표면 전하 밀도와 비례하였다. 이는 섬유상 여과 소재 자체의 전기장(electric field)에 의한 입자 포집률의 증가에 기인하는 것이다. 실험 결과, 표면 전하 밀도와 여과 효율은 밀접할 관계가 있는 것을 확인할 수 있었고 정전기적 특성이 향상된 여과 소재는 공기 정화 시스템의 핵심 부품으로 사용이 가능할 것이다. An electrostatically charged, electret fibrous filter mediun made from polypropylene (PP) and polypropylene-carbon black (PP-CB) was prepared by spray-spinning extrusion system which was equipped with a corona charging unit. The effect of electrostatic characteristics on filtration characteristics was investigated and ESCD (effective surface charge density) of the non-woven filter media was also measured by the vibrating electrode and non-contact compensating techniques. The results showed that the ESCD increased with corona and CB content. And the highest ESCD was achieved at 200㎂ of the corona current and 4 wt% of CB content. The results of filter test on filtration efficiency showed that the electrostatically charged filter media had an excellent filtrating ability compared to the uncharged filter media, and filtration efficiency was proportional to ESCD. The more CB in PP, the higher filtration efficiency was. It resulted from the increased particle-collection ability by electric field of fibrous filter media. Throughout the experimental results, filtration efficiency was closely dependent on the ESCO of filter media. In viewing the results so far achieved, the filter media which showed improvement in electrostatic characteristics in this study will be used as a key element of air purification system.