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에너지/환경 : 공정단위장치로부터의 휘발성유기화합물질의 비산 배출량 산정
박영근 ( Young Geun Park ),문정우 ( Jung Woo Moon ),고민수 ( Min Su Ko ),박현수 ( Hyeon Soo Park ),차순우 ( Soon Woo Chah ),이선우 ( Sun Woo Lee ),홍승철 ( Seung Cheol Hong ),김화용 ( Hwa Yong Kim ),이종협 ( Jong Heop Yi ) 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.3
Considerable effort and expense have been devoted to the estimation and acquisition of the amounts of VOCs relesed thousands of the fugitive emission sources installed in chemical processes. In order to reduce the effort required on the estimation of VOC release, a methodology using a computational fluid dynamics (CFD) was proposed. The estimated values were compared the experimental data obtained using a designed experimental apparatus that was composed of fugitive emission sources such as valves, pump, and flange. The emissions were sampling tedlar bags for a variety of volatile compounds at different pressures. The components were analyzed by a portable gas chromatograph. In conclusion, the amount of benzene and toluene released from fugitive emission sources could be successfully estimated using the CFD technique.
위정호,최창균,주현수,조영상,김화용 ( Jeong Ho Wi,Chang Kyun Choi,Hyun Soo Yoo,Young Sang Cho,Hwa Yong Kim ) 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.4
In this study an algorithm which is based on the second law of thermodynamics is presented for the synthesis of heat exchanger networks. For this purpose a new dimensionless group(the number of exergy loss units) to represent the degradation of energy is defined. The design objective is to find a proper network synthesis minimizing the number of heat exchanger units required under the minimum utility consumption. By testing seven well-known standard problems dealing with 4 to 7 streams, this method proved to be efficient in generating an optimal or near-optimal structure by simple hand calculations. The present method can be used for a preliminary design of actual heat exchange processes.
생물반응기를 이용한 Linear alkylbenzene sulfonate ( LAS ) 와 중간 생성물 Sulfophenylalkanoates ( SPA ) 의 제거
이인구,김지현,유영제,김화용 ( In Ku Lee,Ji Hyeon Kim,Young Je Yoo,Hwa Yong Kim ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.6
A fluidized-bed bioreactor was used to treat the industrial wastewater containing linear alkylbenzene sulfonate(LAS). Microorganism obtained by acclimation showed low growth rate and substrate inhibition at relatively high substrate concentration. It was found from the experiment using fluidized-bed bioreactor that 64 ㎛-thick biofilm was made after 15 days. The 93.4% LAS removal efficiency in the reactor was obtained at 120 ㎎/L of initial LAS concentration, while the removal efficiency of sulfophenylalkanoates(SPA) which is a representative intermediate of biodegradation of LAS was 60-88% depending on the initial concentration of LAS. When sodium benzoate was added to the second reactor, the remaining SPA became lowered by 40% compared to the control experiment. And when activated carbon was added to the reactor, the removal efficiency of SPA was 96.2% and that of LAS was 100% when initial inflowing concentration of LAS was 350 ㎎/L.
액체 이산화탄소 이용한 Monasil PCA 추출에 대한 연구
조동우 ( Dong Woo Cho ),오경실 ( Kyoung Shil Oh ),배원 ( Won Bae ),김화용 ( Hwa Young Kim ),이갑수 ( Kab Soo Lee ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.4
Poly(acrylic acid) (PAA) microspheres is one of the widely-used polymeric materials for the bio-field application and the electric materials. For the synthesis of PAA microspheres, the polymerization technique using surfactants is applied. After the synthesis, the purification and separation processes are required for the removal of surfactant. When general organic solvents were used, many problems, such as huge amount of waste solvent, additional separation processes, and the possibility of residual media, were occurred. Thus, High-pressure Soxhlet extraction using liquid CO2 was developed to solve these problems. In this study, High-pressure Soxhlet extraction of the synthesized PAA microspheres using liquid CO2 was conducted for the removal of Monasil PCA which is used for the dispersion polymerization of acrylic acid in compressed liquid Dimethyl ether (DME). The morphology of the extracted PAA particles was checked by field emission scanning electron microscopy (FE-SEM) and the residual concentration of Monasil PCA was analyzed by inductively coupled plasma - Optical Emission Spectrometer (ICP-OES). For studying the effect of the solvent effect, Soxhlet extraction was conducted using n-hexane, liquid DME, and liquid CO2. In case of n-hexane, some extracted PAA microspheres were produced. However, deformation was also occurred due to the high thermal energy of n-hexane vapor. Liquid DME could not remove Monasil PCA. When using liquid CO2, the extracted PAA microspheres which were free for the residual solvent were produced without deformation. For finding the optimum operating condition, high-pressure Soxhlet extraction was conducted for 8 hours with changing the temperature of reboiler and condenser. When the extractor temperature is 19.6±0.2 oC and the pressure is 51.5±0.5 bar, the best removal efficiency was obtained.